Mercurial > public > hwos_code
annotate src/p2_deco.c @ 655:c7b7b8a358cd default tip
hwOS tech 3.22 release
| author | heinrichsweikamp |
|---|---|
| date | Mon, 29 Apr 2024 13:05:18 +0200 |
| parents | 75e90cd0c2c3 |
| children |
| rev | line source |
|---|---|
| 582 | 1 // *************************************************************************** |
| 650 | 2 // p2_deco.c combined next generation V3.19.4 |
| 0 | 3 // |
| 4 // Created on: 12.05.2009 | |
| 654 | 5 // Author: heinrichs weikamp gmbh, contributions by Ralph Lembcke and others |
| 0 | 6 // |
| 582 | 7 // *************************************************************************** |
| 0 | 8 |
| 9 ////////////////////////////////////////////////////////////////////////////// | |
| 10 // OSTC - diving computer code | |
| 654 | 11 // Copyright (C) 2018 heinrichs weikamp gmbh GmbH |
| 0 | 12 // |
| 13 // This program is free software: you can redistribute it and/or modify | |
| 14 // it under the terms of the GNU General Public License as published by | |
| 623 | 15 // the Free Software Foundation, either version 3 of the License, or |
| 0 | 16 // (at your option) any later version. |
| 17 // | |
| 18 // This program is distributed in the hope that it will be useful, | |
| 19 // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 623 | 20 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 0 | 21 // GNU General Public License for more details. |
| 22 // | |
| 23 // You should have received a copy of the GNU General Public License | |
| 623 | 24 // along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 0 | 25 // |
| 26 ////////////////////////////////////////////////////////////////////////////// | |
| 27 | |
| 623 | 28 // History: |
| 0 | 29 // 01/03/08 v100: first release candidate |
| 30 // 03/13/08 v101: start of programming ppO2 code | |
| 560 | 31 // 03/13/25 v101a: backup of interim version with ppO2 calculation |
| 0 | 32 // 03/13/25 v101: open circuit gas change during deco |
| 623 | 33 // 03/13/25 v101: CNS_fraction_real calculation |
| 0 | 34 // 03/13/26 v101: optimization of tissue calc routines |
| 623 | 35 // 07/xx/2008 v102a: debug of bottom time routine |
| 36 // 09/xx/2008 v102d: Gradient Factor Model implementation | |
| 37 // 10/10/2008 v104: renamed to build v103 for v118 stable | |
| 631 | 38 // 10/14/2008 v104: integration of char_I_last_stop_depth for Gradient Model |
| 623 | 39 // 03/31/2009 v107: integration of FONT Incon24 |
| 40 // 05/23/2010 v109: 5 gas changes & 1 min timer | |
| 41 // 07/13/2010 v110: cns vault added | |
| 42 // 12/25/2010 v110: split in three files (deco.c, main.c, definitions.h) | |
| 0 | 43 // 2011/01/20: [jDG] Create a common file included in ASM and C code. |
| 623 | 44 // 2011/01/24: [jDG] Make ascent time an short. No more overflow! |
| 0 | 45 // 2011/01/25: [jDG] Fusion deco array for both models. |
| 46 // 2011/01/25: [jDG] Use CF(54) to reverse deco order. | |
| 47 // 2011/02/11: [jDG] Reworked gradient-factor implementation. | |
| 48 // 2011/02/15: [jDG] Fixed inconsistencies introduced by gas switch delays. | |
| 49 // 2011/03/21: [jDG] Added gas consumption (CF56 & CF57) evaluation for OCR mode. | |
| 631 | 50 // 2011/04/15: [jDG] Store GF_depth in 32 bits (w/o rounding), for a better stability. |
| 560 | 51 // 2011/04/25: [jDG] Added 1mn mode for CNS calculation, to allow it for deco planning. |
| 0 | 52 // 2011/04/27: [jDG] Fixed char_O_gradient_factor calculation when model uses gradient-factor. |
| 53 // 2011/05/02: [jDG] Added "Future TTS" function (CF58). | |
| 54 // 2011/05/17: [jDG] Various cleanups. | |
| 55 // 2011/08/08: [jDG] Computes CNS during deco planning ascent. | |
| 56 // 2011/11/24: [jDG] Slightly faster and better NDL computation. | |
| 57 // 2011/12/17: [mH] Remove of the useless debug stuff | |
| 58 // 2012/02/24: [jDG] Remove missed stop bug. | |
| 59 // 2012/02/25: [jDG] Looking for a more stable LOW grad factor reference. | |
| 60 // 2012/09/10: [mH] Fill char_O_deco_time_for_log for logbook write | |
| 623 | 61 // 2012/10/05: [jDG] Better calc_gas_needs_ascent accuracy (average depth, switch between stop). |
| 631 | 62 // 2013/03/05: [jDG] Should vault GF_depth too. |
| 0 | 63 // 2013/03/05: [jDG] Wrobell remark: ascent_to_first_stop works better with finer steps (2sec). |
|
33
5d4a4fb0e8a6
Bugfix: NOAA tables for CNS are in ATA, not bar
heinrichsweikamp
parents:
0
diff
changeset
|
64 // 2013/05/08: [jDG] A. Salm remark: NOAA tables for CNS are in ATA, not bar. |
| 560 | 65 // 2013/12/21: [jDG] Fix CNS calculation in deco plan w/o marked gas switch |
| 66 // 2014/06/16: [jDG] Fix Helium diluent. Fix volumes with many travel mix. | |
|
324
0e9dcdcf03c1
FIX NDL prediction error with Buhlmann model: might be desaturating too fast.
jdg@air
parents:
323
diff
changeset
|
67 // 2014/06/29: [mH] Compute int_O_ceiling |
|
0e9dcdcf03c1
FIX NDL prediction error with Buhlmann model: might be desaturating too fast.
jdg@air
parents:
323
diff
changeset
|
68 // 2015/06/12: [jDG] Fix NDL prediction while desaturating with the Buhlmann model. |
| 560 | 69 // 2017/08/04: [mH] Switch to absolute GF everywhere and apply safety margin parameters to both models (GF and non-GF), fixes from Ralph Lembcke |
| 70 // 2017/10/31: [rl] enhancements for pSCR mode and introduction of 2nd deco plan computation | |
| 71 // 2017/12/31: [rl] completion of 2nd deco plan computation and various up-fixes | |
| 584 | 72 // 2018/02/17: [rl] switch-over to new ceiling rounding (V2.98a) |
| 0 | 73 // |
| 74 // | |
| 75 // Literature: | |
| 313 | 76 // Buhlmann, Albert: Tauchmedizin; 4. Auflage [2002]; |
| 604 | 77 // Schroeder, Kai & Reith, Steffen; 2000; Saettigungsvorgaenge beim Tauchen, das Modell ZH-L16, Funktionsweise von Tauchcomputern; http://www.achim-und-kai.de/kai/tausim/saett_faq |
| 0 | 78 // Morrison, Stuart; 2000; DIY DECOMPRESSION; http://www.lizardland.co.uk/DIYDeco.html |
| 79 // Balthasar, Steffen; Dekompressionstheorie I: Neo Haldane Modelle; http://www.txfreak.de/dekompressionstheorie_1.pdf | |
| 80 // Baker, Erik C.; Clearing Up The Confusion About "Deep Stops" | |
| 81 // Baker, Erik C.; Understanding M-values; http://www.txfreak.de/understanding_m-values.pdf | |
| 604 | 82 |
| 83 | |
| 84 // ********************************************************************************************************************************* | |
| 0 | 85 // |
| 604 | 86 // I N C L U D E S |
| 87 // | |
| 88 // ********************************************************************************************************************************* | |
| 89 | |
| 623 | 90 |
| 604 | 91 #include <math.h> |
| 650 | 92 #include <string.h> |
| 582 | 93 #include "p2_definitions.h" |
| 94 #define TEST_MAIN | |
| 95 #include "shared_definitions.h" | |
| 623 | 96 #include "configuration.inc" |
| 0 | 97 |
| 560 | 98 |
| 650 | 99 // work-around for a C18 compiler bug (to avoid a warning been thrown for valid code) |
| 100 #define memcpy(a,b,c) memcpy((a),(const void*)(b),(c)) | |
| 101 | |
| 102 | |
| 604 | 103 // ********************************************************************************************************************************* |
| 104 // | |
| 105 // C O N S T A N T S D E F I N I T I O N S | |
| 106 // | |
| 107 // ********************************************************************************************************************************* | |
| 108 | |
| 623 | 109 |
| 110 // deco engine scheduling | |
| 111 #define INVOKES_PER_SECOND 2 // number of invocations of the deco engine per second (use powers of 2 only: 1, 2, 4, ...) | |
| 628 | 112 |
| 113 #ifdef _hwos_sport | |
| 114 #define BUDGET_PER_SECOND 320 // [ms] total time budget per second for the deco engine, each invocation will preempt after BUDGET_PER_SECOND / INVOKES_PER_SECOND | |
| 115 #else | |
| 623 | 116 #define BUDGET_PER_SECOND 640 // [ms] total time budget per second for the deco engine, each invocation will preempt after BUDGET_PER_SECOND / INVOKES_PER_SECOND |
| 628 | 117 #endif |
| 604 | 118 |
| 560 | 119 // ambient pressure at different mountain heights |
| 120 #define P_ambient_1000m 0.880 // [bar] based on 990 hPa and 20°C at sea level, 15°C at altitude | |
| 121 #define P_ambient_2000m 0.782 // [bar] | |
| 122 #define P_ambient_3000m 0.695 // [bar] | |
| 123 | |
| 124 // ambient pressure in aircraft cabin during flying - worst case according to Buhlmann | |
| 125 #define P_ambient_fly 0.600 // [bar], 0.600 bar is the value used by Buhlmann for his flying-after-diving calculations | |
| 582 | 126 // 0.735 bar is a typical cabin pressure for nowadays commercial jet aircrafts |
| 560 | 127 // ----- |
| 128 // 0.135 bar safety margin | |
| 129 | |
| 130 // constants and factors | |
| 631 | 131 #define ppWater 0.06270 // water vapor partial pressure in the lungs |
| 132 #define METER_TO_BAR 0.09807 // conversion factor (1 m water column = 0.09807 bar) | |
| 133 #define BAR_TO_METER 10.19716 // conversion factor (1 bar = 10.19716 m ) | |
| 134 #define SURFACE_DESAT_FACTOR 0.70420 // surface desaturation safety factor | |
| 135 #define HYST 1.0E-06 // threshold for tissue graphics on-gassing / off-gassing visualization | |
| 643 | 136 #define GAS_DENSITY_He_FACTOR 17.64 // in multiples of 0.01 grams per liter |
| 137 #define GAS_DENSITY_N2_FACTOR 123.46 // in multiples of 0.01 grams per liter | |
| 138 #define GAS_DENSITY_O2_FACTOR 141.02 // in multiples of 0.01 grams per liter | |
| 560 | 139 |
| 140 // thresholds | |
| 628 | 141 #define CNS_LIMIT_WARNING 100 // threshold for CNS warning |
| 142 #define CNS_LIMIT_ATTENTION 70 // threshold for CNS attention | |
| 604 | 143 #define PRESSURE_LIMIT_WARNING 200 // threshold for pressure reading warning : 20.0 bar |
| 144 #define PRESSURE_LIMIT_ATTENTION 500 // threshold for pressure reading attention: 50.0 bar | |
| 631 | 145 #define GAS_NEEDS_ATTENTION 0.7 // threshold for gas needs attention [1 = 100%] |
| 604 | 146 #define O2_CONSUMPTION_LIMIT_ATTENTION 20 // threshold for O2 "SAC" attention: 2.0 l/min |
| 643 | 147 #define ppO2_GAP_TO_SETPOINT 20 // gap between setpoint and max. ppO2 of the pure diluent [cbar] |
| 623 | 148 #define ppO2_MARGIN_ON_MAX 3 // [cbar] margin on ppO2 max to compensate for surface pressures > 1.000 mbar |
| 631 | 149 #define STOP_CHAINING_LIMIT 3 // max. number of chained stop table entries before deco calculation is aborted |
| 628 | 150 |
| 623 | 151 |
| 643 | 152 |
| 623 | 153 // deco engine states and modes - (char_O_)main_status: controls current tissue and deco status calculation (as-is situation) |
| 154 #define CALC_VOLUME 0x01 // =1: calculate gas needs | |
| 155 #define CALCULATE_BOTTOM 0x02 // =1: calculate gas needs in deco calculator mode, =0: in dive mode | |
| 631 | 156 #define CAVE_MODE 0x04 // =1: calculate return path and gas needs using backtracking data |
| 157 #define GAS_CONTINGENCY 0x08 // =1: use a second best gas if best gas is all used up | |
| 623 | 158 #define TR_FUNCTIONS 0x10 // =1: calculate TR functions (pressure reading) processing |
| 159 #define EXTENDED_STOPS 0x20 // =1: allow placement of gas switches below the depth of the 1st stop | |
| 160 | |
| 161 #define MODE_MASK 0xC0 // mask for real tissues mode selection | |
| 162 #define MODE_LOOP 0x40 // =1: CCR (MODE_PSCR needs to be cleared) or pSCR mode | |
| 163 #define MODE_CCR 0x40 // to be used with == operator in combination with MODE_MASK only! | |
| 164 #define MODE_PSCR 0x80 // =1: pSCR mode (MODE_LOOP needs to be set, too) | |
| 165 | |
| 166 // deco engine states and modes - (char_O_)deco_status: controls deco plan calculation (to-be scenario) | |
| 167 #define PLAN_MASK 0x03 // bit mask covering normal & alternative plan flag | |
| 168 #define COMMAND_MASK 0x07 // bit mask covering all command flags | |
| 169 #define CALCULATING 0x00 // calculations are ongoing | |
| 170 #define START_NORM 0x01 // input: start calculation of a normal deco plan | |
| 171 #define CALC_NORM 0x01 // internal: calculating a normal deco plan | |
| 172 #define COMPLETED_NORM 0x01 // output: calculation of a normal deco plan has completed | |
| 173 #define START_ALT 0x02 // input: start calculation of an alternative deco plan | |
| 174 #define CALC_ALT 0x02 // internal: calculating an alternative deco plan | |
| 175 #define COMPLETED_ALT 0x02 // output: calculation of an alternative deco plan has completed | |
| 176 #define INITIALIZE 0x04 // input: initialize deco engine | |
| 631 | 177 #define INITIALIZE_START_NORM 0x05 // input: initialize deco engine and start calculation of a normal deco plan |
| 623 | 178 #define INITIALIZE_START_ALT 0x06 // input: initialize deco engine and start calculation of an alternative deco plan |
| 628 | 179 #define DECO_CALCULATOR_MODE 0x08 // input: deco engine is run from deco calculator |
| 623 | 180 |
| 181 #define BAILOUT_MODE 0x10 // =1: allow gas switches before first deco stop | |
| 631 | 182 #define DELAYED_ASCENT 0x20 // =1: figure in a delayed ascent / delayed turn of the dive (fTTS) |
| 623 | 183 |
| 184 // MODE_MASK 0xC0 // mask for simulated tissues mode selection | |
| 185 // MODE_LOOP 0x40 // =1: CCR (MODE_PSCR needs to be cleared) or pSCR mode | |
| 186 // MODE_CCR 0x40 // to be used with == operator in combination with MODE_MASK only! | |
| 187 // MODE_PSCR 0x80 // =1: pSCR mode (MODE_LOOP needs to be set, too) | |
| 188 | |
| 189 | |
| 190 // deco engine warnings - (char_O_)deco_warnings | |
| 604 | 191 #define DECO_WARNING_IBCD 0x01 // IBCD occurring now |
| 192 #define DECO_WARNING_IBCD_lock 0x02 // IBCD has occurred during the dive | |
| 193 #define DECO_WARNING_MBUBBLES 0x04 // micro bubbles likely to develop now | |
| 194 #define DECO_WARNING_MBUBBLES_lock 0x08 // ditto, but sometime during the dive | |
| 195 #define DECO_WARNING_OUTSIDE 0x10 // tissue pressures outside the Buhlmann model now | |
| 196 #define DECO_WARNING_OUTSIDE_lock 0x20 // tissue pressures outside the model sometime during the dive | |
| 197 #define DECO_ATTENTION_OUTSIDE 0x40 // tissue pressures are very close to the Buhlmann limit | |
| 631 | 198 #define DECO_WARNING_INCOMPLETE 0x80 // deco calculation incomplete due to too long compute time |
| 604 | 199 |
| 623 | 200 // deco engine status (char_O_)deco_info |
| 628 | 201 #define DECO_MODE 0x01 // =1: deco ppO2 levels are permitted |
| 604 | 202 #define IND_DOUBLE_SWITCH_FLAG 0x02 // =1: switch to other tank advice active |
| 631 | 203 #define GAS_NEEDS_fTTS 0x04 // =1: gas needs are calculated in fTTS mode |
| 623 | 204 #define DECO_ZONE 0x08 // =1: fTTS < TTS (not updated when in bailout mode) |
| 631 | 205 #define DECO_CEILING 0x10 // =1: deco obligation (ceiling > 0) |
| 206 #define DECO_STOPS_NORM 0x20 // =1: deco stops found in normal plan | |
| 207 #define DECO_STOPS_ALT 0x40 // =1: deco stops found in alternative plan | |
| 208 #define GAS_NEEDS_CAVE 0x80 // =1: indicated gas needs are calculated in cave mode | |
| 623 | 209 |
| 604 | 210 |
| 211 // deco engine control - tissue_increment | |
| 631 | 212 #define TIME_MASK 0x7F // =0: time increment is 2 or 6 seconds, 1..127: time increments is 1..127 minutes |
| 213 #define TISSUE_SELECTOR 0x80 // =0: calculate on simulated tissues, 1 : calculate on real tissues | |
| 623 | 214 |
| 215 | |
| 216 // deco engine control - next_planning_phase | |
| 217 #define PHASE_00_DONE 0x00 // calculation cycle finished | |
| 218 #define PHASE_10_DIVE_INIT 0x10 // once-per-dive initialization of the deco engine | |
| 628 | 219 #define PHASE_20_CYCLIC_INIT 0x20 // once-every-cycle initialization of the deco engine |
| 220 #define PHASE_30_EXTENDED_BOTTOM_TIME 0x30 // calculate extended bottom time | |
| 221 #define PHASE_40_BOTTOM_GAS_NEED 0x40 // calculate gas needs for bottom segment | |
| 222 #define PHASE_50_NDL_TIME 0x50 // calculate NDL time | |
| 631 | 223 #define PHASE_70_ASCENT_OR_RETURN 0x70 // calculate open water ascent or cave return |
| 650 | 224 #define PHASE_80_RESULTS 0x80 // results - NDL, TTS, TST |
| 225 #define PHASE_81_GAS_NEEDS_PRESSURES 0x81 // results - convert gas needs from volumes to pressures | |
| 623 | 226 #define PHASE_90_FINISH 0x90 // finish calculation cycle |
| 227 | |
| 228 | |
| 631 | 229 // gas & diluent - type and availability state |
| 230 // 0x01 // | 0: disabled, 1: first, 2: normal/work, 3: deco | |
| 231 // 0x02 // | | |
| 232 #define GAS_TYPE_MASK 0x03 // bit mask covering the type enumerator | |
| 233 #define GAS_AVAIL_LOST 0x04 // =1: gas/diluent lost flag (permanently unavailable) | |
| 234 #define GAS_AVAIL_STAGED 0x08 // =1: gas/diluent staged flag (temporary unavailable) | |
| 235 #define GAS_AVAIL_MASK 0x0C // bit mask covering the availability flags | |
| 236 #define GAS_NEED_ATTENTION 0x10 // =1: gas need >= attention threshold | |
| 237 #define GAS_NEED_WARNING 0x20 // =1: gas need >= warning threshold | |
| 238 #define GAS_NEED_MASK 0x30 // bit mask covering the need flags | |
| 239 #define GAS_NEARLY_USED_UP 0x40 // =1: the gas is nearly used up (= at attention threshold) | |
| 240 #define GAS_FULLY_USED_UP 0x80 // =1: the gas is fully used up (= at warning threshold) | |
| 241 | |
| 242 | |
| 560 | 243 // flags used with integer numbers |
| 604 | 244 #define INT_FLAG_INVALID 0x0400 // =1: value not valid |
| 623 | 245 #define INT_FLAG_NOT_COMPUTED_YET 0x0800 // =1: value not computed yet |
| 604 | 246 #define INT_FLAG_ZERO 0x0800 // =1: value is zero |
| 247 #define INT_FLAG_LOW 0x1000 // =1: value is below a lower warning threshold | |
| 248 #define INT_FLAG_NOT_AVAIL 0x1000 // =1: value is not available (not computed) | |
| 249 #define INT_FLAG_HIGH 0x2000 // =1: value is above an upper warning threshold | |
| 250 #define INT_FLAG_OUTDATED 0x2000 // =1: value has not been updated for too long | |
| 251 #define INT_FLAG_ATTENTION 0x4000 // =1: value exceeds the attention threshold | |
| 252 #define INT_FLAG_WARNING 0x8000 // =1: value exceeds the warning threshold | |
| 253 #define INT_FLAG_OUT_OF_RANGE 0x8000 // =1: value exceeds presentable range | |
| 254 | |
| 255 | |
| 256 | |
| 257 // ********************************************************************************************************************************* | |
| 258 // | |
| 259 // ** P R O T O T Y P E S ** | |
| 260 // | |
| 261 // The Functions are listed in sequence of intended usage / application. | |
| 262 // | |
| 263 // ********************************************************************************************************************************* | |
| 264 | |
| 623 | 265 // Functions used in Surface Mode |
| 604 | 266 static void calc_interval(PARAMETER unsigned char time_increment); |
| 267 // Calculates the tissue off-gassing under surface conditions. | |
| 268 static void calc_desaturation_time(void); // Calculates the desaturation and no-fly times. | |
| 269 static void clear_tissue(void); // Resets all tissues to surface pressure equilibrium state. | |
| 623 | 270 static void init_output_vars(void); // Initializes all deco engine output variables to defaults |
| 271 | |
| 272 // Main entry point in Dive Mode | |
| 604 | 273 static void calc_hauptroutine(void); // Sequences all calculations for the real tissues and the deco calculation. |
| 274 | |
| 623 | 275 // Functions dedicated to the real Tissues |
| 604 | 276 static void calc_hauptroutine_data_input(void);// Initializes environment data and sets gas ratios for the real tissues. |
| 277 | |
| 623 | 278 // Functions combined for real Tissues & Deco Calculations |
| 604 | 279 static void calc_alveolar_pressures(void); // Computes the partial pressures from the gas ratios and many more parameters, |
| 280 // needs either calc_hauptroutine_data_input() be called beforehand or | |
| 628 | 281 // gas_take_current() or gas_find_best()/gas_take_best() and gas_set_ratios(). |
| 604 | 282 static void calc_tissues(void); // Updates the tissues dependent on the partial pressures of N2 and He. |
| 283 static void calc_CNS(void); // Updates the CNS value dependent on the partial pressure of the O2. | |
| 650 | 284 static void calc_limit(PARAMETER float GF_parameter); |
| 631 | 285 // Calculates ceiling, current supersaturation factor and some more data. |
| 604 | 286 |
| 623 | 287 // Functions for TR |
| 288 #ifdef _rx_functions | |
| 289 static void calc_TR_functions(void); // Calculates SAC etc. | |
| 290 #endif | |
| 291 | |
| 631 | 292 // Functions for Cave Mode |
| 293 #ifdef _cave_mode | |
| 294 static void read_backtrack_data(void); // Gets the data of the next backtracking data set | |
| 295 #endif | |
| 296 | |
| 623 | 297 // Functions dedicated to Deco Calculations |
| 604 | 298 static void clear_deco_table(void); // Clears the deco stops table, invoked at the start of each calculation cycle. |
| 631 | 299 static void gas_take_current(void); // Take the actual currently used gas for ascent & deco calculation |
| 628 | 300 static unsigned char gas_find_best(void); // Searches for the best gas available. |
| 301 static void gas_take_best(void); // Switches to the best gas that has been found found before by gas_find_best(). | |
| 604 | 302 static void gas_set_ratios(void); // Sets the gas ratios for use in deco calculation (simulated tissues), |
| 628 | 303 // needs to be called after each gas change (gas_take_current/_better). |
| 623 | 304 static void calc_NDL_time_tissue(void); // Calculates the remaining NDL time for a given tissue. |
| 305 static unsigned char find_next_stop(void); // Finds the next stop when in a deco ascent. | |
| 631 | 306 static void update_deco_table(PARAMETER unsigned char time_increment); |
| 604 | 307 // Enters a new stop or extends an existing stop in the deco stops table. |
| 631 | 308 static void calc_required_volume(void); // Calculates gas volume required for a given depth, time and usage (SAC rate). |
| 650 | 309 static void convert_volume_to_pressure(PARAMETER unsigned char index); |
| 310 // Converts gas volumes into pressures and sets respective flags. | |
| 623 | 311 |
| 312 // Functions for Results Reporting | |
| 604 | 313 static void publish_deco_table(void); // Copies the internal deco stops table to the export interface. |
| 623 | 314 static void convert_cur_CNS_for_display(void); // Converts the current CNS value from float to integer. |
| 604 | 315 static void convert_sim_CNS_for_display(void); // Converts the end-of-dive CNS value from float to integer. |
| 623 | 316 static void convert_sat_for_display(void); // Converts leading tissue saturation value from float to integer, 1.0 = 100%. |
| 604 | 317 static void convert_ceiling_for_display(void); // Converts ceiling from float to integer in mbar relative pressure. |
| 318 | |
| 319 | |
| 623 | 320 // internal helper Functions |
| 321 static void load_tmr5(void); // Loads a hardware timer which is used for preemptive scheduling. | |
| 322 static void read_tmr5(void); // Reads a hardware timer which is used for preemptive scheduling. | |
| 323 static void read_CNS_ab_coefficient(void); // Reads the CNS a and b coefficients from a ROM table. | |
| 324 static void read_CNS_c_coefficient(void); // Reads the CNS c coefficient from a ROM table. | |
| 325 static void read_Buhlmann_coefficients(void); // Reads the Buhlmann a and b coefficients from a ROM table. | |
| 650 | 326 static void read_Buhlmann_times(PARAMETER unsigned char period); |
| 604 | 327 // Reads pre-computed tissue increment factors from a ROM table. |
| 328 static void read_Buhlmann_ht(void); // Reads the half-times from a ROM table. | |
| 329 static void adopt_Buhlmann_coefficients(void); // Computes average a and b coefficient by the N2/He tissue ratio. | |
| 330 static void push_tissues_to_vault(void); // Stores the state of the real tissues during simulator runs. | |
| 331 static void pull_tissues_from_vault(void); // Restores the state of the real tissues after a simulator run. | |
| 628 | 332 static void calc_N2_equilibrium(void); // Calculate partial pressure of N2 in respired air at surface pressure. |
| 333 static void get_saturation_factors(void); // Get, safeguard and convert the saturation and desaturation factors. | |
| 334 static void apply_saturation_factors(void); // Applies saturation and desaturation factors. | |
| 604 | 335 |
| 336 | |
| 337 // ********************************************************************************************************************************* | |
| 338 // | |
| 339 // V A R I A B L E S D E F I N I T I O N S | |
| 340 // | |
| 341 // ********************************************************************************************************************************* | |
| 0 | 342 |
| 650 | 343 |
| 344 //---- Bank 13 parameters ----------------------------------------------------- | |
| 345 #ifndef UNIX | |
| 346 # pragma udata overlay bank13=0xd00 | |
| 347 static char C_STACK[256]; // C-code data stack | |
| 348 # define C_STACK_ADDR C_STACK | |
| 349 #endif | |
| 350 | |
| 351 // 256 byte used, bank is full | |
| 352 | |
| 353 | |
| 354 //---- Bank 7 parameters ----------------------------------------------------- | |
| 355 #ifndef UNIX | |
| 356 # pragma udata bank7=0x700 | |
| 357 #endif | |
| 358 | |
| 359 // tissue pressures for the real tissues (128 byte) | |
| 360 | |
| 361 static float real_pres_tissue_N2[NUM_COMP]; // 16 floats = 64 bytes || keep order and position of these variables as | |
| 362 static float real_pres_tissue_He[NUM_COMP]; // 16 floats = 64 bytes || they are backed-up to & restored from EEPROM! | |
| 363 | |
| 364 // delta-pressures for the real tissue pressures (128 byte) | |
| 365 | |
| 366 static float real_pres_delta_N2[NUM_COMP]; // 16 floats = 64 bytes | |
| 367 static float real_pres_delta_He[NUM_COMP]; // 16 floats = 64 bytes | |
| 368 | |
| 369 // 256 byte used, bank is full | |
| 370 | |
| 371 | |
| 372 //---- Bank 8 parameters ----------------------------------------------------- | |
| 373 #ifndef UNIX | |
| 374 # pragma udata bank8=0x800 | |
| 375 #endif | |
| 376 | |
| 377 // tissue pressures for the simulated tissues (128 byte) | |
| 378 | |
| 379 static float sim_pres_tissue_N2[NUM_COMP]; // 16 floats = 64 bytes | |
| 380 static float sim_pres_tissue_He[NUM_COMP]; // 16 floats = 64 bytes | |
| 381 | |
| 382 // delta-pressures for the simulated tissues (128 byte) | |
| 383 | |
| 384 static float sim_pres_delta_N2[NUM_COMP]; // 16 floats = 64 bytes | |
| 385 static float sim_pres_delta_He[NUM_COMP]; // 16 floats = 64 bytes | |
| 386 | |
| 387 // 256 byte used, bank is full | |
| 388 | |
| 389 | |
| 390 //---- Bank 12 parameters ----------------------------------------------------- | |
| 391 | |
| 392 #ifndef UNIX | |
| 393 # pragma udata bank12=0xc00 | |
| 394 #endif | |
| 395 | |
| 396 // vault for backing up real tissue pressures (128 byte) | |
| 397 | |
| 398 static float vault_pres_tissue_N2[NUM_COMP]; // 16 floats = 64 bytes | |
| 399 static float vault_pres_tissue_He[NUM_COMP]; // 16 floats = 64 bytes | |
| 400 | |
| 401 // vault for backing up real delta-pressures (128 byte) | |
| 402 | |
| 403 static float vault_pres_delta_N2[NUM_COMP]; // 16 floats = 64 bytes | |
| 404 static float vault_pres_delta_He[NUM_COMP]; // 16 floats = 64 bytes | |
| 405 | |
| 406 // 256 byte used, bank is full | |
| 407 | |
| 408 | |
| 0 | 409 //---- Bank 5 parameters ----------------------------------------------------- |
| 410 #ifndef UNIX | |
| 411 # pragma udata bank5=0x500 | |
| 412 #endif | |
| 413 | |
| 650 | 414 // Timer5 Interface (3 byte) - Attention: keep order and keep at beginning of bank 5, i.e. at address 0x500 ! |
| 415 | |
| 416 static volatile unsigned short tmr5_value; // | timer 5 value buffer MUST be at address 0x500 | |
| 417 static volatile unsigned char tmr5_overflow; // | timer 5 overflow flag MUST be at address 0x502 | |
| 631 | 418 |
| 419 | |
| 420 // Environmental and Gas Data (51 byte) | |
| 560 | 421 |
| 582 | 422 static float pres_surface; // absolute pressure at the surface |
| 560 | 423 |
| 628 | 424 static float float_depth_real; // current real depth in meters, float |
| 425 static unsigned char char_depth_real; // current real depth in meters, integer | |
| 631 | 426 static unsigned char char_depth_start; // start value of simulated depth in meters, integer |
| 628 | 427 static unsigned char char_depth_sim; // current value of simulated depth in meters, integer |
| 604 | 428 |
| 429 static float real_pres_respiration; // current real depth in absolute pressure | |
| 430 static float real_O2_ratio; // real breathed gas oxygen ratio | |
| 431 static float real_N2_ratio; // real breathed gas nitrogen ratio | |
| 432 static float real_He_ratio; // real breathed gas helium ratio | |
| 433 static float real_pSCR_drop; // real ppO2 drop in pSCR loop | |
| 582 | 434 |
| 435 static float sim_pres_respiration; // simulated current depth in abs.pressure, used for deco calculations | |
| 436 static float sim_O2_ratio; // simulated breathed gas oxygen ratio | |
| 437 static float sim_N2_ratio; // simulated breathed gas nitrogen ratio | |
| 438 static float sim_He_ratio; // simulated breathed gas helium ratio | |
| 439 static float sim_pSCR_drop; // simulated ppO2 drop in pSCR loop | |
| 560 | 440 |
| 604 | 441 |
| 631 | 442 // general Deco Parameters (64 byte) |
| 623 | 443 |
| 444 static float GF_low; // gradient factor to determine 1st stop | |
| 445 static float GF_high; // gradient factor to determine surfacing | |
| 446 | |
| 631 | 447 static unsigned char GF_low_last; // last GF low, used to detect a GF change |
| 448 static unsigned char GF_high_last; // last GF high, used to detect a GF change | |
| 449 | |
| 450 static unsigned char GF_depth; // GF low reference depth in current calculation cycle | |
| 451 static unsigned char GF_depth_norm; // GF low reference depth in normal plan | |
| 452 static unsigned char GF_depth_alt; // GF low reference depth in alternative plan | |
| 453 | |
| 454 static float GF_slope; // (GF_high - GF_low) / GF_depth in current calculation cycle | |
| 455 static float GF_slope_norm; // (GF_high - GF_low) / GF_depth_norm in normal plan | |
| 456 static float GF_slope_alt; // (GF_high - GF_low) / GF_depth_alt in alternative plan | |
| 457 | |
| 623 | 458 static float float_saturation_multiplier; // safety factor for on-gassing rates |
| 459 static float float_desaturation_multiplier; // safety factor for off-gassing rates | |
| 460 | |
| 461 static unsigned char split_N2_He[NUM_COMP]; // used for calculating the desaturation time | |
| 631 | 462 static unsigned char deco_gas_type[NUM_GAS]; // type and state of the deco gases |
| 463 static unsigned char peer_tank[NUM_GAS]; // bit flag vector indicating peer tanks holding same gas | |
| 464 | |
| 465 | |
| 650 | 466 // real Context: what we are doing now (16 byte) |
| 467 | |
| 468 static float CNS_fraction_real; // current real CNS (1.00 = 100%) | |
| 623 | 469 static unsigned short IBCD_tissue_vector; // 16 bit vector to memorize all tissues that experience IBCD |
| 470 | |
| 471 static float pres_respiration_sac; // used in SAC calculation: current depth in absolute pressure | |
| 472 static float float_sac; // used in SAC calculation: SAC value in float | |
| 473 static unsigned short max_sac_rate; // used in SAC calculation: threshold for SAC rate attention | |
| 474 | |
| 475 | |
| 476 // simulated Context: used to calculate Ascent (11 byte) | |
| 477 | |
| 478 static float CNS_fraction_sim; // CNS after predicted ascent, 0.01 = 1%, as float | |
| 479 static unsigned short int_sim_CNS_fraction; // CNS after predicted ascent, 1 = 1%, as integer | |
| 480 static unsigned char NDL_tissue_start_norm; // tissue to start with when calculating the normal NDL time | |
| 481 static unsigned char NDL_tissue_start_alt; // tissue to start with when calculating the alternative NDL time | |
| 482 static unsigned char NDL_tissue_start; // tissue to start with in current cycle | |
| 483 static unsigned char NDL_tissue_lead; // tissue with the shortest NDL time found in current cycle | |
| 484 static unsigned char NDL_tissue; // tissue for which the NDL is calculated right now | |
| 485 | |
| 628 | 486 |
| 623 | 487 // Result Values from Calculation Functions (9 byte) |
| 488 | |
| 489 static float ceiling; // minimum tolerated relative pressure (i.e. without surface pressure) | |
| 490 static float lead_supersat; // supersaturation of the leading tissue, 1.0 = 100% | |
| 631 | 491 static unsigned char lead_tissue; // number of the leading tissue (0-15) |
| 623 | 492 |
| 493 | |
| 494 // Transfer Variables between calc_desaturation_time() and calc_desaturation_time_helper() (18 byte) | |
| 495 | |
| 496 static float desat_factor; // used to cache a pre-computed factor | |
| 631 | 497 static float var_ht; // half-time factor for the compartment |
| 498 static float pres_target; // target pressure for the compartment | |
| 499 static float pres_actual; // current pressure of the compartment | |
| 623 | 500 static unsigned short int_time; // time it takes for the compartment to reach the target pressure |
| 501 | |
| 502 | |
| 650 | 503 // Gas in Use and Gas Needs (66 byte) |
| 631 | 504 |
| 505 static unsigned char start_gas_num; // number of the gas/dil to start with | |
| 628 | 506 |
| 507 static unsigned char sim_gas_last_num; // number of the last used gas | |
| 623 | 508 static unsigned char sim_gas_current_num; // number of the currently used gas |
| 509 static unsigned char sim_gas_current_depth; // change depth of the currently used gas | |
| 510 | |
| 631 | 511 static unsigned char sim_gas_best_num; // number of the best gas available |
| 512 static unsigned char sim_gas_best_depth; // change depth of the best gas available | |
| 628 | 513 |
| 631 | 514 static float gas_volume_need[NUM_GAS]; // gas volumes required for ascent / cave return in liters |
| 515 static float gas_volume_avail[NUM_GAS]; // gas volumes available for ascent / cave return in liters | |
| 516 static float gas_volume_atten[NUM_GAS]; // attention threshold for gas volumes available | |
| 517 | |
| 518 | |
| 519 // Transfer Variables for calc_required_volume() (7 byte) | |
| 628 | 520 |
| 521 static unsigned char gas_needs_depth; // depth of the stop or half-way point | |
| 631 | 522 static unsigned char gas_needs_time; // duration of the stop, ascent or travel phase |
| 628 | 523 static unsigned char gas_needs_usage_rate; // gas usage in l/min |
| 631 | 524 static float gas_needs_volume_due; // computed amount of required gas volume |
| 525 | |
| 526 | |
| 650 | 527 // Transfer Values for convert_float_to_int() (6 byte) |
| 528 | |
| 529 static float float_value; // input value, float | |
| 530 static unsigned short int_value; // output value, 16 bit | |
| 531 | |
| 532 | |
| 533 // 251 byte used, 5 byte left in this bank (4 bytes per float, 2 bytes per short, 1 byte per char) | |
| 631 | 534 |
| 535 | |
| 536 //---- Bank 6 parameters ----------------------------------------------------- | |
| 537 #ifndef UNIX | |
| 538 # pragma udata bank6=0x600 | |
| 539 #endif | |
| 540 | |
| 650 | 541 // Modes, Sequencing and Indexing (17 byte) |
| 631 | 542 |
| 543 static unsigned char main_status; // shadow register for char_O_main_status | |
| 544 static unsigned char deco_status; // shadow register for char_O_deco_status | |
| 545 static unsigned char deco_info; // shadow register for char_O_deco_info | |
| 546 static unsigned char deco_warnings; // shadow register for char_O_deco_warnings | |
| 547 static unsigned char next_planning_phase; // next calculation phase to be executed | |
| 548 static unsigned char tissue_increment; // selector for real/simulated tissues and time increment | |
| 549 static unsigned char sequence_timer; // timer to sequence deco engine tasks | |
| 550 static unsigned char ci; // index to the Buhlmann tables (compartment index) | |
| 551 static unsigned char cns_i; // index to the CNS tables (ppO2 range index) | |
| 552 static unsigned char i; // general purpose loop counter and index | |
| 553 static unsigned char j; // general purpose loop counter and index | |
| 554 static unsigned char stop_index; // current stop table position | |
| 555 static unsigned char chained_stops; // counter for chained stop entries | |
| 556 static unsigned char backtrack_index; // index into the depth backtracking array char_I_backtrack_storage | |
| 557 static unsigned char backtrack_target_depth; // current backtracking target depth | |
| 558 static unsigned char backtrack_step_counter; // counter for number of 1/10 minute steps done | |
| 650 | 559 static unsigned char spare; // UNUSED YET, placed here for alignment purpose |
| 560 | |
| 561 | |
| 562 // Result Values from Calculation Functions (30 byte) | |
| 631 | 563 |
| 564 static float ppO2_O2; // ppO2 calculated for breathing pure oxygen in OC mode | |
| 565 static float ppO2_OC; // ppO2 calculated for breathing current gas in OC mode | |
| 566 static float ppO2_pSCR; // ppO2 calculated for breathing current gas in pSCR mode | |
| 567 | |
| 568 static float ppO2; // partial pressure of breathed oxygen | |
| 569 static float ppN2; // partial pressure of breathed nitrogen | |
| 570 static float ppHe; // partial pressure of breathed helium | |
| 571 | |
| 572 static unsigned char char_ppO2; // partial pressure of breathed oxygen, 100 = 1.00 bar | |
| 573 static unsigned char NDL_time; // time in full minutes until reaching no-deco limit (NDL) | |
| 574 static unsigned short TTS_time; // time in 1/10 minutes until finishing ascent / cave return | |
| 575 static unsigned short TST_time; // time in full minutes of all stops in ascent / cave return | |
| 576 | |
| 577 | |
| 578 // Buhlmann Model Parameters (40 byte) | |
| 579 | |
| 580 static float var_N2_a; // Buhlmann a for current N2 tissue | |
| 581 static float var_N2_b; // Buhlmann b for current N2 tissue | |
| 582 static float var_He_a; // Buhlmann a for current He tissue | |
| 583 static float var_He_b; // Buhlmann b for current He tissue | |
| 584 static float var_a; // Buhlmann a adopted to current N2/He ratio | |
| 585 static float var_b; // Buhlmann b adopted to current N2/He ratio | |
| 586 static float var_N2_e; // exposition for current N2 tissue | |
| 587 static float var_He_e; // exposition for current He tissue | |
| 588 static float var_N2_ht; // half-time for current N2 tissue | |
| 589 static float var_He_ht; // half-time for current He tissue | |
| 590 | |
| 591 | |
| 623 | 592 // Auxiliary Variables for Data Buffering (28 byte) |
| 593 | |
| 594 static float N2_equilibrium; // used for N2 tissue graphics scaling | |
| 595 static float temp_tissue; // auxiliary variable to buffer tissue pressures | |
| 596 static float float_pSCR_factor; // pre-computed factor for pSCR ppO2 drop calculation | |
| 597 static float calc_pres_tissue_N2; // auxiliary variable to buffer tissue N2 pressure | |
| 598 static float calc_pres_tissue_He; // auxiliary variable to buffer tissue He pressure | |
| 650 | 599 static float calc_pres_tissue; // auxiliary variable to buffer total tissue pressure |
| 623 | 600 static float old_pres_respiration; // auxiliary variable to buffer sim_pres_respiration |
| 601 | |
| 602 | |
| 650 | 603 // CNS Coefficients (10 byte) |
| 604 | |
| 605 static float var_cns_gain; // two coefficients approximation, gain | |
| 606 static float var_cns_offset; // two coefficients approximation, offset | |
| 607 static unsigned short var_cns_value; // one coefficient approximation, value | |
| 608 | |
| 609 | |
| 610 // Vault to back-up & restore Tissue related Data (6 byte) | |
| 611 | |
| 612 static float vault_CNS_fraction_real; // stores CNS percentage (1.0 = 100%) | |
| 613 static unsigned char vault_deco_warnings; // stores warnings status | |
| 614 static unsigned char vault_deco_info; // stores info status | |
| 615 | |
| 616 | |
| 617 // stops table (96 byte) | |
| 618 | |
| 619 static unsigned char internal_deco_depth[NUM_STOPS]; // depths of the stops in meters | |
| 620 static unsigned char internal_deco_time[NUM_STOPS]; // durations of the stops in minutes | |
| 621 static unsigned char internal_deco_gas[NUM_STOPS]; // gases used on the stops (0 / 1-5) | |
| 628 | 622 |
| 623 | |
| 624 // Performance Profiling (4 byte) | |
| 625 | |
| 626 static unsigned short profiling_runtime; // performance measurement: runtime of current invocation | |
| 627 static unsigned char profiling_runs; // performance measurement: invocations per deco calculation cycle | |
| 628 static unsigned char profiling_phase; // performance measurement: current calculation phase | |
| 629 | |
| 630 | |
| 650 | 631 // Function Parameters placed by the C Compiler (7 byte) |
| 632 /* | |
| 633 static unsigned char period | |
| 634 static float parameter | |
| 635 static unsigned char time_increment | |
| 636 static unsigned char time_interval | |
| 637 */ | |
| 638 | |
| 639 | |
| 640 // 238 byte used, 18 byte left in this bank (4 bytes per float, 2 bytes per short, 1 byte per char) | |
| 641 | |
| 0 | 642 |
| 582 | 643 |
| 604 | 644 // ********************************************************************************************************************************* |
| 645 // | |
| 646 // L O O K - U P T A B L E S | |
| 647 // | |
| 648 // ********************************************************************************************************************************* | |
| 582 | 649 |
| 0 | 650 #ifndef UNIX |
| 631 | 651 # pragma romdata Buhlmann_ht = 0x1DC00 // needs to be in the UPPER bank |
| 652 #endif | |
| 653 | |
| 654 rom const float Buhlmann_ht[2*16] = { | |
| 655 // Compartment half-times, in minutes | |
| 656 //--- N2 ---- He ---------------------- | |
| 657 4.0, 1.51, | |
| 658 8.0, 3.02, | |
| 659 12.5, 4.72, | |
| 660 18.5, 6.99, | |
| 661 27.0, 10.21, | |
| 662 38.3, 14.48, | |
| 663 54.3, 20.53, | |
| 664 77.0, 29.11, | |
| 665 109.0, 41.20, | |
| 666 146.0, 55.19, | |
| 667 187.0, 70.69, | |
| 668 239.0, 90.34, | |
| 669 305.0, 115.29, | |
| 670 390.0, 147.42, | |
| 671 498.0, 188.24, | |
| 672 635.0, 240.03 | |
| 673 }; | |
| 674 | |
| 675 | |
| 676 #ifndef UNIX | |
| 623 | 677 # pragma romdata CNS_tables = 0x1DC80 // needs to be in the UPPER bank |
| 678 #endif | |
| 679 | |
| 631 | 680 rom const float CNS_2_approx[2*11] = { |
| 681 // 2 coefficient approximation for ppO2 = 51 ... 160 cbar | |
| 682 // CNS increment per 2 sec = 1 / (gain*ppO2 + offset) with ppO2 in [cbar] | |
| 683 // gain offset for ppO2 cbar range | |
| 623 | 684 -533.07, 54000, // 51 - 60 (index 0) |
| 685 -444.22, 48600, // 61 - 70 (index 1) | |
| 686 -355.38, 42300, // 71 - 80 (index 2) | |
| 687 -266.53, 35100, // 81 - 90 (index 3) | |
| 688 -177.69, 27000, // 91 - 100 (index 4) | |
| 689 -177.69, 27000, // 101 - 110 (index 5) | |
| 690 -88.84, 17100, // 111 - 120 (index 6) | |
| 691 -88.84, 17100, // 121 - 130 (index 7) | |
| 692 -88.84, 17100, // 131 - 140 (index 8) | |
| 693 -88.84, 17100, // 141 - 150 (index 9) | |
| 694 -222.11, 37350 // 151 - 160 (index 10) | |
| 695 }; | |
| 696 | |
| 631 | 697 rom const unsigned short CNS_1_approx[1*18] = { |
| 698 // 1 coefficient approximation for ppO2 = 161 ... 250 cbar | |
| 699 // CNS increment per 2 sec = c / 100000.0 | |
| 700 // value in [1/100000] for ppO2 cbar range | |
| 623 | 701 75, // 161 - 165 (index 0) |
| 702 102, // 166 - 170 (index 1) | |
| 703 136, // 171 - 175 (index 2) | |
| 704 180, // 176 - 180 (index 3) | |
| 705 237, // 181 - 185 (index 4) | |
| 706 310, // 186 - 190 (index 5) | |
| 707 401, // 191 - 195 (index 6) | |
| 708 517, // 196 - 200 (index 7) | |
| 709 760, // 201 - 205 (index 8) | |
| 710 1100, // 206 - 210 (index 9) | |
| 711 1500, // 211 - 215 (index 10) | |
| 712 2090, // 216 - 220 (index 11) | |
| 713 2900, // 221 - 225 (index 12) | |
| 714 3900, // 226 - 230 (index 13) | |
| 715 4820, // 231 - 235 (index 14) | |
| 716 4820, // 236 - 240 (index 15) | |
| 717 4820, // 241 - 245 (index 16) | |
| 628 | 718 4820 // 246 - 250 (index 17) |
| 623 | 719 }; |
| 720 | |
| 721 | |
| 722 #ifndef UNIX | |
| 631 | 723 # pragma romdata Buhlmann_ab = 0x1DD00 // needs to be in the UPPER bank |
| 0 | 724 #endif |
| 725 | |
| 560 | 726 rom const float Buhlmann_ab[4*16] = { |
| 631 | 727 // Compartment a and b factors |
|
521
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
728 // Data ZH-L16C, from Bühlmann Tauchmedizin 2002, option 1a (4mn) |
| 631 | 729 // a for N2 b for N2 a for He b for He |
|
521
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
730 1.2599, 0.5050, 1.7424, 0.4245, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
731 1.0000, 0.6514, 1.3830, 0.5747, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
732 0.8618, 0.7222, 1.1919, 0.6527, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
733 0.7562, 0.7825, 1.0458, 0.7223, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
734 0.6200, 0.8126, 0.9220, 0.7582, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
735 0.5043, 0.8434, 0.8205, 0.7957, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
736 0.4410, 0.8693, 0.7305, 0.8279, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
737 0.4000, 0.8910, 0.6502, 0.8553, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
738 0.3750, 0.9092, 0.5950, 0.8757, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
739 0.3500, 0.9222, 0.5545, 0.8903, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
740 0.3295, 0.9319, 0.5333, 0.8997, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
741 0.3065, 0.9403, 0.5189, 0.9073, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
742 0.2835, 0.9477, 0.5181, 0.9122, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
743 0.2610, 0.9544, 0.5176, 0.9171, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
744 0.2480, 0.9602, 0.5172, 0.9217, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
745 0.2327, 0.9653, 0.5119, 0.9267 |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
746 }; |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
747 |
| 631 | 748 |
| 749 #ifndef UNIX | |
| 750 # pragma romdata e_tables = 0x1DE00 // needs to be in the UPPER bank | |
| 751 #endif | |
| 752 | |
| 753 rom const float e2sec[2*16] = { | |
| 754 // Integration constants for 2 seconds, | |
| 755 // result of 1 - 2^(-(2sec/60sec / HT)) | |
|
521
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
756 //---- N2 ------------- He ------------ |
| 623 | 757 5.75958E-03, 1.51848E-02, |
|
521
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
758 2.88395E-03, 7.62144E-03, |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
759 1.84669E-03, 4.88315E-03, |
| 582 | 760 1.24813E-03, 3.29997E-03, |
| 761 8.55371E-04, 2.26041E-03, | |
| 762 6.03079E-04, 1.59437E-03, | |
| 763 4.25414E-04, 1.12479E-03, | |
| 764 3.00019E-04, 7.93395E-04, | |
| 765 2.11949E-04, 5.60641E-04, | |
| 766 1.58240E-04, 4.18555E-04, | |
| 767 1.23548E-04, 3.26795E-04, | |
| 768 9.66686E-05, 2.55722E-04, | |
| 769 7.57509E-05, 2.00387E-04, | |
| 770 5.92416E-05, 1.56716E-04, | |
| 771 4.63943E-05, 1.22734E-04, | |
| 772 3.63850E-05, 9.62538E-05 | |
|
521
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
773 //------------------------------------- |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
774 }; |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
775 |
| 631 | 776 rom const float e6sec[2*16] = { |
| 777 // Integration constants for 6 seconds, | |
| 778 // result of 1 - 2^(-(6sec/60sec / HT)) | |
| 779 //---- N2 ------------- He ------------ | |
| 780 1.71794E-02, 4.48661E-02, | |
| 781 8.62691E-03, 2.26905E-02, | |
| 782 5.52983E-03, 1.45780E-02, | |
| 783 3.73973E-03, 9.86726E-03, | |
| 784 2.56392E-03, 6.76591E-03, | |
| 785 1.80815E-03, 4.77549E-03, | |
| 786 1.27570E-03, 3.37057E-03, | |
| 787 8.99786E-04, 2.37830E-03, | |
| 788 6.35713E-04, 1.68098E-03, | |
| 789 4.74646E-04, 1.25514E-03, | |
| 790 3.70598E-04, 9.80064E-04, | |
| 791 2.89978E-04, 7.66971E-04, | |
| 792 2.27236E-04, 6.01040E-04, | |
| 793 1.77714E-04, 4.70075E-04, | |
| 794 1.39176E-04, 3.68157E-04, | |
| 795 1.09151E-04, 2.88734E-04 | |
| 796 //------------------------------------- | |
| 797 }; | |
| 798 | |
|
521
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
799 rom const float e1min[2*16] = { |
| 631 | 800 // Integration constants for 1 minute, |
| 801 // result of 1 - 2^(-(1min / HT)) | |
|
521
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
802 //----- N2 --------- e 1min He -------- |
| 582 | 803 1.59104E-01, 3.68109E-01, |
| 804 8.29960E-02, 2.05084E-01, | |
| 805 5.39424E-02, 1.36579E-01, | |
| 806 3.67742E-02, 9.44046E-02, | |
| 807 2.53454E-02, 6.56359E-02, | |
| 808 1.79351E-02, 4.67416E-02, | |
| 809 1.26840E-02, 3.31991E-02, | |
| 810 8.96152E-03, 2.35301E-02, | |
| 811 6.33897E-03, 1.66832E-02, | |
| 812 4.73633E-03, 1.24808E-02, | |
| 813 3.69981E-03, 9.75753E-03, | |
| 814 2.89600E-03, 7.64329E-03, | |
| 815 2.27003E-03, 5.99417E-03, | |
| 816 1.77572E-03, 4.69082E-03, | |
| 817 1.39089E-03, 3.67548E-03, | |
| 818 1.09097E-03, 2.88359E-03 | |
|
521
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
819 //------------------------------------- |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
820 }; |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
821 |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
822 rom const float e10min[2*16] = { |
| 631 | 823 // Integration constants for 10 minutes, |
| 824 // result of 1 - 2^(-(10min / HT)) | |
|
521
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
825 //---- N2 -------------- He ----------- |
| 582 | 826 8.23223E-01, 9.89851E-01, |
| 827 5.79552E-01, 8.99258E-01, | |
| 828 4.25651E-01, 7.69737E-01, | |
| 829 3.12487E-01, 6.29027E-01, | |
| 830 2.26416E-01, 4.92821E-01, | |
| 831 1.65547E-01, 3.80407E-01, | |
| 832 1.19840E-01, 2.86538E-01, | |
| 833 8.60863E-02, 2.11886E-01, | |
| 834 6.16117E-02, 1.54849E-01, | |
| 835 4.63665E-02, 1.18026E-01, | |
| 836 3.63881E-02, 9.34005E-02, | |
| 837 2.85855E-02, 7.38569E-02, | |
| 838 2.24698E-02, 5.83504E-02, | |
| 839 1.76160E-02, 4.59303E-02, | |
| 840 1.38222E-02, 3.61528E-02, | |
| 841 1.08563E-02, 2.84646E-02 | |
|
521
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
842 //------------------------------------- |
|
06e9370c6d75
CHANGE: Apply safety margin parameters to both models (GF and non-GF)
heinrichsweikamp
parents:
519
diff
changeset
|
843 }; |
| 0 | 844 |
| 604 | 845 |
| 846 // ********************************************************************************************************************************* | |
| 0 | 847 // |
| 604 | 848 // H E L P E R F U N C T I O N S |
| 849 // | |
| 850 // ********************************************************************************************************************************* | |
| 851 | |
| 852 | |
| 628 | 853 // p2deco code moved from 0x0D000 to 0x0C000 in v.108 |
| 634 | 854 // moved from 0x0C000 to 0x0B000 in v3.09 |
| 0 | 855 #ifndef UNIX |
| 634 | 856 # pragma code p2_deco = 0x0B000 |
| 0 | 857 #endif |
| 858 | |
| 859 | |
| 860 ////////////////////////////////////////////////////////////////////////////// | |
| 861 // Bump to blue-screen when an assert is wrong | |
| 623 | 862 #ifdef _DEBUG |
| 0 | 863 void assert_failed(PARAMETER short int line) |
| 864 { | |
| 865 } | |
| 866 #endif | |
| 867 | |
| 604 | 868 |
| 0 | 869 ////////////////////////////////////////////////////////////////////////////// |
| 628 | 870 // When calling C code from ASM context, the C data stack pointer need to be |
| 871 // reset. The C stack is located in bank 8. | |
| 0 | 872 |
| 873 #ifdef CROSS_COMPILE | |
| 584 | 874 # define RESET_C_STACK |
| 0 | 875 #else |
| 623 | 876 # ifdef _DEBUG |
| 584 | 877 # define RESET_C_STACK fillDataStack(); |
| 878 void fillDataStack(void) | |
| 879 { | |
| 880 _asm | |
| 650 | 881 LFSR 1,C_STACK_ADDR |
| 604 | 882 MOVLW 0xCC |
| 883 loop: MOVWF POSTINC1,0 | |
| 884 TSTFSZ FSR1L,0 | |
| 885 BRA loop | |
| 886 | |
| 650 | 887 LFSR 1,C_STACK_ADDR |
| 888 LFSR 2,C_STACK_ADDR | |
| 584 | 889 _endasm |
| 890 } | |
| 891 # else | |
| 650 | 892 # define RESET_C_STACK \ |
| 893 _asm \ | |
| 894 LFSR 1,C_STACK_ADDR \ | |
| 895 LFSR 2,C_STACK_ADDR \ | |
| 584 | 896 _endasm |
| 897 # endif | |
| 0 | 898 #endif |
| 899 | |
| 604 | 900 |
| 0 | 901 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 902 // Reset timer 5 |
| 903 // | |
| 904 // Note: TMR5 is configured in 16 bit mode: a value written to TMR5H is buffered | |
| 905 // and will be written to TMR5 together with a successive write to TMR5L. | |
| 906 // As we don't know in which bank the code will be executed, we use either | |
| 907 // the bank-save "movff" command, or address mapping via access bank (",0"). | |
| 908 // | |
| 909 static void load_tmr5(void) | |
| 0 | 910 { |
| 911 #ifndef CROSS_COMPILE | |
| 584 | 912 _asm |
| 650 | 913 movff 0x501,0xF7D // bank-safe load TMR5H from C variable tmr5_value first |
| 914 movff 0x500,0xF7C // bank-safe load TMR5L from C variable tmr5_value thereafter | |
| 623 | 915 bcf 0xFBA,1,0 // clear timer 5 overrun flag (0xFBA = PIR5, bit 1 = TMR5IF) |
| 916 _endasm | |
| 0 | 917 #else |
| 623 | 918 return; |
| 919 #endif | |
| 920 } | |
| 921 | |
| 922 | |
| 923 ////////////////////////////////////////////////////////////////////////////// | |
| 924 // Read timer 5 | |
| 925 // | |
| 926 // Note: TMR5 reads in multiples of 1/32 ms, 30.51757813 us/bit to be precise. | |
| 927 // TMR5 is configured in 16 bit mode: on reading of TMR5L the contents of | |
| 928 // TMR5H is latched and can be read afterwards without potential rollover. | |
| 929 // As we don't know in which bank the code will be executed, we use either | |
| 930 // the bank-save "movff" command, or address mapping via access bank (",0"). | |
| 931 // | |
| 932 static void read_tmr5(void) | |
| 933 { | |
| 934 #ifndef CROSS_COMPILE | |
| 935 _asm | |
| 650 | 936 movff 0xF7C,0x500 // copy TMR5L to C variable tmr5_value, low byte first |
| 937 movff 0xF7D,0x501 // copy TMR5H to C variable tmr5_value, high byte thereafter | |
| 623 | 938 clrf WREG,0 // clear WREG to 0x00 = no overrun by default |
| 939 btfsc 0xFBA,1,0 // did timer 5 overrun? (0xFBA = PIR5, bit 1 = TMR5IF) | |
| 940 setf WREG,0 // YES - set WREG to 0xff = overrun detected | |
| 650 | 941 movff WREG,0x502 // copy WREG to C variable tmr5_overflow |
| 623 | 942 _endasm |
| 943 #else | |
| 944 return; | |
| 0 | 945 #endif |
| 946 } | |
| 947 | |
| 604 | 948 |
| 0 | 949 ////////////////////////////////////////////////////////////////////////////// |
| 631 | 950 // Read CNS coefficients gain and offset |
| 623 | 951 // |
| 952 static void read_CNS_ab_coefficient(void) | |
| 953 { | |
| 954 #ifndef CROSS_COMPILE | |
| 955 // Note: We don't use far ROM pointer, because handling | |
| 956 // 24 bit is to complex, hence we have to set the | |
| 957 // UPPER page ourself... | |
| 958 // -> set to zero if tables are moved to lower pages! | |
| 959 _asm | |
| 960 movlw 1 | |
| 961 movwf TBLPTRU,0 | |
| 962 _endasm | |
| 963 #endif | |
| 964 | |
| 965 { | |
| 631 | 966 overlay rom const float* ptr = &CNS_2_approx[2*cns_i]; |
| 967 var_cns_gain = *ptr++; | |
| 968 var_cns_offset = *ptr++; | |
| 623 | 969 } |
| 970 } | |
| 971 | |
| 972 | |
| 973 ////////////////////////////////////////////////////////////////////////////// | |
| 974 // Read CNS coefficient c | |
| 975 // | |
| 976 static void read_CNS_c_coefficient(void) | |
| 977 { | |
| 978 #ifndef CROSS_COMPILE | |
| 979 // Note: We don't use far ROM pointer, because handling | |
| 980 // 24 bit is to complex, hence we have to set the | |
| 981 // UPPER page ourself... | |
| 982 // -> set to zero if tables are moved to lower pages! | |
| 983 _asm | |
| 984 movlw 1 | |
| 985 movwf TBLPTRU,0 | |
| 986 _endasm | |
| 987 #endif | |
| 988 | |
| 989 { | |
| 631 | 990 overlay rom const unsigned short* ptr = &CNS_1_approx[cns_i]; |
| 991 var_cns_value = *ptr++; | |
| 623 | 992 } |
| 993 } | |
| 994 | |
| 995 ////////////////////////////////////////////////////////////////////////////// | |
| 996 // Read Buhlmann coefficients a and b for compartment ci | |
| 0 | 997 // |
| 560 | 998 static void read_Buhlmann_coefficients(void) |
| 0 | 999 { |
| 1000 #ifndef CROSS_COMPILE | |
| 604 | 1001 // Note: We don't use far ROM pointer, because handling |
| 1002 // 24 bit is too complex, hence we have to set the | |
| 1003 // UPPER page ourself... | |
| 628 | 1004 // -> set to zero if tables are moved to lower pages! |
| 584 | 1005 _asm |
| 604 | 1006 movlw 1 |
| 1007 movwf TBLPTRU,0 | |
| 584 | 1008 _endasm |
| 0 | 1009 #endif |
| 1010 | |
| 584 | 1011 assert( ci < NUM_COMP ); |
| 1012 | |
| 604 | 1013 // use an interleaved array (AoS) to access coefficients with a single addressing |
| 584 | 1014 { |
| 1015 overlay rom const float* ptr = &Buhlmann_ab[4*ci]; | |
| 1016 var_N2_a = *ptr++; | |
| 1017 var_N2_b = *ptr++; | |
| 1018 var_He_a = *ptr++; | |
| 1019 var_He_b = *ptr++; | |
| 1020 } | |
| 0 | 1021 } |
| 1022 | |
| 604 | 1023 |
| 0 | 1024 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 1025 // Read Buhlmann increments for compartment ci |
| 604 | 1026 // If period == 0 : 2 sec interval |
| 1027 // 1 : 1 min interval | |
| 1028 // 2 : 10 min interval | |
| 650 | 1029 static void read_Buhlmann_times(PARAMETER unsigned char period) |
| 0 | 1030 { |
| 1031 #ifndef CROSS_COMPILE | |
| 604 | 1032 // Note: We don't use far ROM pointer, because handling |
| 1033 // 24 bit is to complex, hence we have to set the | |
| 631 | 1034 // UPPER page by hand... |
| 604 | 1035 // -> set to zero if tables are moved to lower pages! |
| 584 | 1036 _asm |
| 604 | 1037 movlw 1 |
| 1038 movwf TBLPTRU,0 | |
| 584 | 1039 _endasm |
| 0 | 1040 #endif |
| 1041 | |
| 584 | 1042 assert( ci < NUM_COMP ); |
| 1043 | |
| 623 | 1044 // Integration Intervals |
| 584 | 1045 switch(period) |
| 1046 { | |
| 631 | 1047 case 0: //---- 2 or 6 seconds -------------------------------------------- |
| 584 | 1048 { |
| 631 | 1049 // check which tissues are selected |
| 1050 if(tissue_increment & TISSUE_SELECTOR) | |
| 1051 { | |
| 1052 // real tissues - 2 seconds | |
| 1053 overlay rom const float* ptr = &e2sec[2*ci]; | |
| 1054 var_N2_e = *ptr++; | |
| 1055 var_He_e = *ptr++; | |
| 1056 } | |
| 1057 else | |
| 1058 { | |
| 1059 // simulated tissues - 6 seconds | |
| 1060 overlay rom const float* ptr = &e6sec[2*ci]; | |
| 1061 var_N2_e = *ptr++; | |
| 1062 var_He_e = *ptr++; | |
| 1063 } | |
| 584 | 1064 } |
| 1065 break; | |
| 1066 | |
| 631 | 1067 case 1: //---- 1 minutes ------------------------------------------------- |
| 584 | 1068 { |
| 1069 overlay rom const float* ptr = &e1min[2*ci]; | |
| 1070 var_N2_e = *ptr++; | |
| 1071 var_He_e = *ptr++; | |
| 1072 } | |
| 1073 break; | |
| 1074 | |
| 631 | 1075 case 2: //---- 10 minutes ------------------------------------------------ |
| 584 | 1076 { |
| 1077 overlay rom const float* ptr = &e10min[2*ci]; | |
| 1078 var_N2_e = *ptr++; | |
| 1079 var_He_e = *ptr++; | |
| 1080 } | |
| 623 | 1081 break; |
| 584 | 1082 |
| 1083 default: | |
| 623 | 1084 assert(0); // code execution shall never pass along here! |
| 584 | 1085 } |
| 0 | 1086 } |
| 1087 | |
| 604 | 1088 |
| 0 | 1089 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 1090 // Read Buhlmann half-times for compartment ci |
| 0 | 1091 // |
| 560 | 1092 static void read_Buhlmann_ht(void) |
| 0 | 1093 { |
| 1094 | |
| 1095 #ifndef CROSS_COMPILE | |
| 604 | 1096 // Note: We don't use far ROM pointer, because handling |
| 1097 // 24 bit is to complex, hence we have to set the | |
| 1098 // UPPER page ourself... | |
| 1099 // -> Set to zero if tables are moved to lower pages! | |
| 584 | 1100 _asm |
| 604 | 1101 movlw 1 |
| 1102 movwf TBLPTRU,0 | |
| 584 | 1103 _endasm |
| 0 | 1104 #endif |
| 1105 | |
| 584 | 1106 assert( ci < NUM_COMP ); |
| 1107 { | |
| 1108 overlay rom const float* ptr = &Buhlmann_ht[2*ci]; | |
| 1109 var_N2_ht = *ptr++; | |
| 1110 var_He_ht = *ptr++; | |
| 1111 } | |
| 1112 | |
| 604 | 1113 assert( 4.0 <= var_N2_ht && var_N2_ht <= 635.0 ); |
| 584 | 1114 assert( 1.5099 <= var_He_ht && var_He_ht <= 240.03 ); |
| 0 | 1115 } |
| 1116 | |
| 604 | 1117 |
| 0 | 1118 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 1119 // Calculate adopted Buhlmann coefficients |
| 1120 // | |
| 1121 // Input: var_N2_a, var_N2_b coefficients for N2 | |
| 1122 // var_He_a, var_He_b coefficients for He | |
| 1123 // calc_pres_tissue_N2 partial pressure of N2 in tissue | |
| 1124 // calc_pres_tissue_He partial pressure of He in tissue | |
| 650 | 1125 // calc_pres_tissue total pressure in tissue |
| 623 | 1126 // |
| 1127 // Output: var_a, var_b coefficients adopted by N2/He ratio | |
| 604 | 1128 // |
| 1129 static void adopt_Buhlmann_coefficients(void) | |
| 1130 { | |
| 1131 // adopt a and b coefficients to current N2/He ratio inside the tissue | |
| 623 | 1132 |
| 1133 #ifdef _helium | |
| 1134 | |
| 650 | 1135 var_a = (var_N2_a * calc_pres_tissue_N2 + var_He_a * calc_pres_tissue_He) / calc_pres_tissue; |
| 1136 var_b = (var_N2_b * calc_pres_tissue_N2 + var_He_b * calc_pres_tissue_He) / calc_pres_tissue; | |
| 623 | 1137 |
| 1138 #else | |
| 1139 | |
| 1140 var_a = var_N2_a; | |
| 1141 var_b = var_N2_b; | |
| 1142 | |
| 1143 #endif | |
| 1144 | |
| 1145 } | |
| 1146 | |
| 1147 | |
| 1148 ////////////////////////////////////////////////////////////////////////////// | |
| 1149 // Calculate partial pressure of N2 in respired air at surface pressure | |
| 1150 // | |
| 1151 // Input: pres_surface surface pressure | |
| 1152 // | |
| 1153 // Output: N2_equilibrium partial pressure of N2 in surface air | |
| 1154 // | |
| 1155 static void calc_N2_equilibrium(void) | |
| 1156 { | |
| 1157 N2_equilibrium = 0.7902 * (pres_surface - ppWater); | |
| 1158 } | |
| 1159 | |
| 1160 | |
| 1161 ////////////////////////////////////////////////////////////////////////////// | |
| 1162 // Get, safeguard and convert the saturation and desaturation factors | |
| 1163 // | |
| 1164 // Input: char_I_saturation_multiplier saturation factor (integer) | |
| 1165 // char_I_desaturation_multiplier desaturation factor (integer) | |
| 1166 // | |
| 1167 // Output: float_saturation_multiplier saturation factor (float) | |
| 1168 // float_desaturation_multiplier desaturation factor (float) | |
| 1169 // | |
| 1170 static void get_saturation_factors(void) | |
| 1171 { | |
| 1172 // safeguard input parameters that are constant during the course of the dive | |
| 1173 if( char_I_saturation_multiplier < 100 ) char_I_saturation_multiplier = 100; | |
| 1174 if( char_I_saturation_multiplier > 140 ) char_I_saturation_multiplier = 140; | |
| 1175 | |
| 1176 if( char_I_desaturation_multiplier < 60 ) char_I_desaturation_multiplier = 60; | |
| 1177 if( char_I_desaturation_multiplier > 100 ) char_I_desaturation_multiplier = 100; | |
| 1178 | |
| 1179 // convert input parameters to float numbers | |
| 1180 float_saturation_multiplier = 0.01 * char_I_saturation_multiplier; | |
| 1181 float_desaturation_multiplier = 0.01 * char_I_desaturation_multiplier; | |
| 1182 } | |
| 1183 | |
| 1184 | |
| 1185 ////////////////////////////////////////////////////////////////////////////// | |
| 1186 // apply_saturation_factors | |
| 1187 // | |
| 1188 // Apply safety factors for both ZH-L16 models. | |
| 1189 // | |
| 1190 // Modified: temp_tissue safeguarded tissue increment/decrement | |
| 1191 // | |
| 1192 static void apply_saturation_factors(void) | |
| 1193 { | |
| 1194 assert( 0.0 < float_desaturation_multiplier && float_desaturation_multiplier <= 1.0 ); | |
| 1195 assert( 1.0 <= float_saturation_multiplier && float_saturation_multiplier <= 2.0 ); | |
| 1196 | |
| 1197 if ( temp_tissue < 0.0 ) temp_tissue *= float_desaturation_multiplier; | |
| 1198 else temp_tissue *= float_saturation_multiplier; | |
| 1199 } | |
| 1200 | |
| 1201 | |
| 1202 ////////////////////////////////////////////////////////////////////////////// | |
| 1203 // convert_float_to_int | |
| 1204 // | |
| 1205 // Converts a float within range 0.0 - 9.99 into 16 bit integer scaled in 1/100. | |
| 1206 // | |
| 1207 static void convert_float_to_int(void) | |
| 1208 { | |
| 1209 if ( float_value < 0.005 ) int_value = 0; | |
| 1210 else if ( float_value >= 9.985 ) int_value = 999; | |
| 1211 else int_value = (unsigned short)(100 * float_value + 0.5); | |
| 1212 } | |
| 1213 | |
| 1214 | |
| 604 | 1215 |
| 1216 // ********************************************************************************************************************************* | |
| 1217 // | |
| 1218 // J U M P I N F U N C T I O N S | |
| 1219 // | |
| 1220 // ********************************************************************************************************************************* | |
| 1221 | |
| 582 | 1222 |
| 1223 ////////////////////////////////////////////////////////////////////////////// | |
| 1224 // deco_calc_hauptroutine | |
| 1225 // | |
| 1226 // called from: divemode.asm | |
| 1227 // | |
| 628 | 1228 // Called two times per second during diving, updates the |
| 1229 // tissues every second (i.e. on every second invocation). | |
| 582 | 1230 // |
| 628 | 1231 // On each computation cycle: |
| 582 | 1232 // - Updates deco table (char_O_deco_time/depth) with new values, |
| 1233 // - updates ascent time, and | |
| 628 | 1234 // - sets status to zero (so we can check a cycle has finished). |
| 582 | 1235 // |
| 1236 void deco_calc_hauptroutine(void) | |
| 1237 { | |
| 1238 RESET_C_STACK | |
| 1239 calc_hauptroutine(); | |
| 1240 } | |
| 1241 | |
| 623 | 1242 |
| 1243 ////////////////////////////////////////////////////////////////////////////// | |
| 1244 // deco_init_output_vars | |
| 1245 // | |
| 1246 // called from divemode.asm | |
| 1247 // | |
| 1248 // Initializes all output variables to their default values. | |
| 1249 // | |
| 1250 void deco_init_output_vars(void) | |
| 1251 { | |
| 1252 RESET_C_STACK | |
| 1253 init_output_vars(); | |
| 1254 } | |
| 1255 | |
| 628 | 1256 |
| 582 | 1257 ////////////////////////////////////////////////////////////////////////////// |
| 1258 // deco_clear_tissue | |
| 1259 // | |
| 1260 // called from: start.asm | |
| 1261 // menu_tree.asm | |
| 1262 // simulator.asm | |
| 1263 // | |
| 628 | 1264 // Sets all tissues to equilibrium with air at ambient pressure, |
| 582 | 1265 // resets all CNS values, any warnings and resets all model output. |
| 1266 // | |
| 1267 void deco_clear_tissue(void) | |
| 1268 { | |
| 1269 RESET_C_STACK | |
| 1270 clear_tissue(); | |
| 1271 } | |
| 1272 | |
| 623 | 1273 |
| 582 | 1274 ////////////////////////////////////////////////////////////////////////////// |
| 1275 // deco_calc_dive_interval | |
| 1276 // | |
| 1277 // called from: simulator.asm | |
| 1278 // | |
| 628 | 1279 // Updates tissues and CNS value for char_I_dive_interval minutes on air at |
| 1280 // ambient pressure and calculates resulting saturation and ceiling for a | |
| 1281 // GF-high of 100% (ceiling and saturation not used by simulator.asm) | |
| 582 | 1282 // |
| 1283 void deco_calc_dive_interval(void) | |
| 1284 { | |
| 1285 RESET_C_STACK | |
| 1286 calc_interval(char_I_dive_interval); | |
| 1287 } | |
| 1288 | |
| 623 | 1289 |
| 582 | 1290 ////////////////////////////////////////////////////////////////////////////// |
| 1291 // deco_calc_dive_interval_1min | |
| 1292 // | |
| 1293 // called from: start.asm | |
| 1294 // sleepmode.asm | |
| 1295 // surfmode.asm | |
| 1296 // menu_tree.asm | |
| 1297 // ghostwriter.asm | |
| 1298 // | |
| 604 | 1299 // Updates tissues and CNS value for 1 minute on air at ambient pressure and |
| 628 | 1300 // calculates resulting saturation and ceiling for a GF-high of 100%. |
| 582 | 1301 // |
| 1302 void deco_calc_dive_interval_1min(void) | |
| 1303 { | |
| 1304 RESET_C_STACK | |
| 1305 calc_interval(1); | |
| 1306 } | |
| 1307 | |
| 1308 | |
| 1309 ////////////////////////////////////////////////////////////////////////////// | |
| 604 | 1310 // deco_calc_dive_interval_10min |
| 582 | 1311 // |
| 1312 // called from: sleepmode.asm | |
| 1313 // | |
| 604 | 1314 // Updates tissues and CNS value for 10 minutes on air at ambient pressure and |
| 628 | 1315 // calculates resulting saturation and ceiling for a GF-high of 100%. |
| 582 | 1316 // |
| 1317 void deco_calc_dive_interval_10min(void) | |
| 1318 { | |
| 1319 RESET_C_STACK | |
| 1320 calc_interval(10); | |
| 1321 } | |
| 1322 | |
| 1323 | |
| 1324 ////////////////////////////////////////////////////////////////////////////// | |
| 1325 // deco_calc_desaturation_time | |
| 1326 // | |
| 1327 // called from: start.asm | |
| 1328 // surfmode.asm | |
| 1329 // menu_tree.asm | |
| 1330 // ghostwriter.asm | |
| 1331 // | |
| 1332 // Computes desaturation and no-fly times. | |
| 1333 // | |
| 1334 void deco_calc_desaturation_time(void) | |
| 1335 { | |
| 1336 RESET_C_STACK | |
| 1337 calc_desaturation_time(); | |
| 1338 } | |
| 1339 | |
| 623 | 1340 |
| 582 | 1341 ////////////////////////////////////////////////////////////////////////////// |
| 1342 // deco_push_tissues_to_vault | |
| 1343 // | |
| 1344 // called from: simulator.asm | |
| 1345 // | |
| 1346 // Makes a backup of the state of the real tissues and the deco engine. | |
| 1347 // | |
| 1348 void deco_push_tissues_to_vault(void) | |
| 1349 { | |
| 1350 RESET_C_STACK | |
| 1351 push_tissues_to_vault(); | |
| 1352 } | |
| 1353 | |
| 623 | 1354 |
| 582 | 1355 ////////////////////////////////////////////////////////////////////////////// |
| 1356 // deco_pull_tissues_from_vault | |
| 1357 // | |
| 1358 // called from: simulator.asm | |
| 1359 // ghostwriter.asm | |
| 1360 // | |
| 1361 // Restores the state of the real tissues and the deco engine from the backup. | |
| 1362 // | |
| 1363 void deco_pull_tissues_from_vault(void) | |
| 1364 { | |
| 1365 RESET_C_STACK | |
| 1366 pull_tissues_from_vault(); | |
| 1367 } | |
| 1368 | |
| 604 | 1369 |
| 1370 // ********************************************************************************************************************************* | |
| 1371 // | |
| 1372 // M A I N F U N C T I O N S | |
| 1373 // | |
| 1374 // ********************************************************************************************************************************* | |
| 582 | 1375 |
| 1376 | |
| 1377 ////////////////////////////////////////////////////////////////////////////// | |
| 628 | 1378 // Calculate the next deco stop |
| 0 | 1379 // |
| 1380 // INPUT, fixed during dive: | |
| 623 | 1381 // pres_surface : surface pressure (as absolute pressure) |
| 631 | 1382 // char_I_last_stop_depth : depth of the last deco stop |
| 623 | 1383 // |
| 628 | 1384 // INPUT, may change during dive: |
| 623 | 1385 // GF_high : GF high factor |
| 1386 // GF_low : GF low factor | |
| 631 | 1387 // GF_depth : GF low reference depth |
| 1388 // GF_slope : GF slope | |
| 1389 // | |
| 1390 // MODIFIED | |
| 623 | 1391 // char_depth_sim : simulated depth in meters |
| 0 | 1392 // |
| 1393 // OUTPUT | |
| 631 | 1394 // GF_depth_norm/_alt : updated GF low depth reference |
| 1395 // GF_slope_norm/_alt : updated GF slope | |
| 623 | 1396 // |
| 1397 // RETURN | |
| 631 | 1398 // TRUE: a deco stop is required, FALSE: no deco stop required |
| 623 | 1399 // |
| 1400 static unsigned char find_next_stop(void) | |
| 0 | 1401 { |
| 623 | 1402 overlay unsigned char depth_1min; |
| 1403 overlay unsigned char depth_limit; | |
| 628 | 1404 overlay unsigned char stop_depth; |
| 1405 overlay unsigned char next_stop; | |
| 631 | 1406 |
| 1407 | |
| 1408 // calculate the current deco ceiling (minimum relative pressure) | |
| 1409 if( char_I_model == 0 ) calc_limit(1.0); // straight Buhlmann | |
| 1410 else if( NDL_time ) calc_limit(GF_high); // with GF: not in deco | |
| 1411 else if( char_depth_sim >= GF_depth ) calc_limit(GF_low); // in deco, below or at low depth reference | |
| 1412 else calc_limit(GF_high - GF_slope * (float)char_depth_sim); // in deco, above low depth reference | |
| 1413 | |
| 1414 // convert the deco ceiling from relative pressure to meters, | |
| 1415 // rounded up (i.e. made deeper) to the next full meter | |
| 1416 depth_limit = (unsigned char)(ceiling * BAR_TO_METER + 0.99); | |
| 1417 | |
| 1418 | |
| 1419 #ifdef _cave_mode | |
| 1420 // in cave or open water mode? | |
| 1421 if( main_status & CAVE_MODE ) | |
| 623 | 1422 { |
| 631 | 1423 // cave mode |
| 1424 | |
| 1425 // does backtracking require descent or keeping depth? | |
| 1426 if( backtrack_target_depth >= char_depth_sim ) | |
| 1427 { | |
| 1428 // YES - decent to target depth or stay at current depth | |
| 1429 char_depth_sim = backtrack_target_depth; | |
| 1430 | |
| 1431 // - done, no stop required | |
| 1432 return(0); | |
| 1433 } | |
| 1434 else | |
| 1435 { | |
| 1436 // NO | |
| 1437 | |
| 1438 // target depth requires an ascent - determine ascent limit due to deco obligation | |
| 1439 stop_depth = depth_limit; | |
| 1440 | |
| 1441 // apply correction for the shallowest stop | |
| 1442 if( stop_depth && (stop_depth < char_I_last_stop_depth) ) stop_depth = char_I_last_stop_depth; | |
| 1443 } | |
| 623 | 1444 } |
| 1445 else | |
| 631 | 1446 #endif |
| 623 | 1447 { |
| 631 | 1448 // open water vertical ascent mode - determine the stop depth |
| 1449 | |
| 1450 // stop depth is depth limit rounded up (made deeper) to the next multiple of 3 meters | |
| 1451 stop_depth = 3 * ( (depth_limit + 2) / 3 ); | |
| 1452 | |
| 1453 // apply correction for the shallowest stop | |
| 1454 if( stop_depth == 3 ) stop_depth = char_I_last_stop_depth; | |
| 623 | 1455 } |
| 1456 | |
| 631 | 1457 // is the stop depth shallower than the current depth (can we ascent)? |
| 1458 if( stop_depth < char_depth_sim ) | |
| 623 | 1459 { |
| 631 | 1460 // YES - ascent by 1 meter |
| 1461 char_depth_sim--; | |
| 1462 | |
| 1463 // done, no stop needed | |
| 1464 return(0); | |
| 623 | 1465 } |
| 1466 | |
| 1467 // ----------------------------------------------------------------------- | |
| 631 | 1468 // we need to make a stop because we are not allowed to ascent any further |
| 623 | 1469 // ----------------------------------------------------------------------- |
| 1470 | |
| 631 | 1471 // set depth to stop depth |
| 628 | 1472 char_depth_sim = stop_depth; |
| 1473 | |
| 1474 // Apply correction in case the stop is to be placed deeper than a | |
| 1475 // previously recorded stop for a gas change. This may happen because | |
| 1476 // the deco stops are placed at the next deeper multiple of 3 meters | |
| 1477 // instead of the real stop's depth. Correction is to relocate the | |
| 1478 // deco stop to the depth of the last gas change. The resulting combined | |
| 1479 // stop's duration will be the sum of the configured gas change time plus | |
| 1480 // the duration of the deco stop itself. | |
| 1481 if( 0 < internal_deco_depth[stop_index] ) | |
| 1482 if( char_depth_sim > internal_deco_depth[stop_index] ) | |
| 631 | 1483 char_depth_sim = internal_deco_depth[stop_index]; |
| 1484 | |
| 1485 // if using straight Buhlmann: done, stop needed | |
| 1486 if( char_I_model == 0 ) return(1); | |
| 623 | 1487 |
| 1488 // ----------------------------------------------------------------------- | |
| 628 | 1489 // we need to make or hold a stop and we are using the GF extension |
| 623 | 1490 // ----------------------------------------------------------------------- |
| 1491 | |
| 631 | 1492 // is the stop_depth deeper than the GF low depth reference used up to now? |
| 1493 if( stop_depth > GF_depth ) | |
| 623 | 1494 { |
| 631 | 1495 // YES - update the GF low depth reference |
| 1496 GF_depth = stop_depth; | |
| 1497 GF_slope = (GF_high - GF_low) / (float)GF_depth; | |
| 623 | 1498 |
| 1499 // store for use in next cycles | |
| 1500 if( deco_status & CALC_NORM ) | |
| 560 | 1501 { |
| 631 | 1502 GF_depth_norm = GF_depth; |
| 1503 GF_slope_norm = GF_slope; | |
| 582 | 1504 } |
| 560 | 1505 else |
| 1506 { | |
| 631 | 1507 GF_depth_alt = GF_depth; |
| 1508 GF_slope_alt = GF_slope; | |
| 560 | 1509 } |
| 623 | 1510 } |
| 1511 | |
| 631 | 1512 #ifdef _cave_mode |
| 1513 // if in cave mode: done, stop needed | |
| 1514 if( main_status & CAVE_MODE ) return(1); | |
| 1515 #endif | |
| 1516 | |
| 1517 // We have a stop depth candidate. But with a steep GF slope, the stop(s) after | |
| 1518 // this first stop may be allowed to ascent to, too. This is because the gradient | |
| 623 | 1519 // factor that will be used at the next depth(s) will allow more tissue super- |
| 631 | 1520 // saturation, maybe so much more that the next stop(s) will be allowed to ascent |
| 1521 // to. So we have to probe the next stops that are within the reach of 1 minute | |
| 1522 // of ascent as well. | |
| 1523 | |
| 1524 // compute depth in meters that is reachable within 1 minute of ascent at 10 m/min | |
| 1525 depth_1min = ( char_depth_sim > 10 ) ? char_depth_sim - 10 : 0; | |
| 623 | 1526 |
| 628 | 1527 // probe all stop depths that are in reach of 1 minute of ascent |
| 631 | 1528 next_stop = stop_depth; |
| 628 | 1529 |
| 1530 while(next_stop > 0) | |
| 623 | 1531 { |
| 631 | 1532 // compute the depth of the next stop to probe |
| 1533 if ( next_stop <= char_I_last_stop_depth ) next_stop = 0; | |
| 1534 else if ( next_stop == 6 ) next_stop = char_I_last_stop_depth; | |
| 628 | 1535 else next_stop -= 3; |
| 1536 | |
| 631 | 1537 // done if the next stop would be above the 1 minute limit |
| 1538 if( next_stop < depth_1min ) return(1); | |
| 1539 | |
| 1540 // compute the ceiling for the next stop depth | |
| 1541 calc_limit(GF_high - GF_slope * (float)next_stop); | |
| 1542 | |
| 1543 // done if the next stop would be above the ceiling | |
| 1544 if( next_stop < (unsigned char)(ceiling * BAR_TO_METER + 0.99) ) return(1); | |
| 1545 | |
| 1546 // the next stop depth is allowed, ascent to it and redo trying further stop | |
| 1547 char_depth_sim = next_stop; | |
| 582 | 1548 } |
| 1549 | |
| 631 | 1550 // reached the surface, done with no further stop |
| 1551 return(0); | |
| 0 | 1552 } |
| 1553 | |
| 604 | 1554 |
| 0 | 1555 ////////////////////////////////////////////////////////////////////////////// |
| 631 | 1556 // Take the actual currently used gas for ascent & deco calculation |
| 1557 // | |
| 1558 // Input: start_gas_num number of the gas/dil to start with (1..5 or 6) | |
| 623 | 1559 // |
| 1560 // Output: sim_gas_current_num 1..6 or 0 for the manually configured gas/dil | |
| 1561 // sim_gas_current_depth change depth (MOD) of the gas/dil in meters | |
| 560 | 1562 // |
| 628 | 1563 static void gas_take_current(void) |
| 560 | 1564 { |
| 631 | 1565 assert( 1 <= start_gas_num && start_gas_num <= 6 ); |
| 1566 | |
| 1567 | |
| 1568 // check origin of the gas/diluent to start with | |
| 1569 if( start_gas_num <= NUM_GAS ) | |
| 582 | 1570 { |
| 631 | 1571 // pre-configured gas/diluent |
| 1572 | |
| 1573 // set gas number | |
| 1574 sim_gas_current_num = sim_gas_last_num = start_gas_num; | |
| 1575 | |
| 1576 // set change depth | |
| 1577 sim_gas_current_depth = char_I_deco_gas_change[start_gas_num-1]; | |
| 628 | 1578 |
| 1579 // capture case of non-configured change depth | |
| 1580 if( sim_gas_current_depth == 0 ) sim_gas_current_depth = 255; | |
| 582 | 1581 } |
| 1582 else | |
| 560 | 1583 { |
| 631 | 1584 // on-the-fly configured gas/diluent ("gas 6") |
| 1585 | |
| 1586 // set gas number | |
| 1587 sim_gas_current_num = sim_gas_last_num = 0; | |
| 1588 | |
| 1589 // set change depth | |
| 604 | 1590 sim_gas_current_depth = char_I_gas6_depth; |
| 560 | 1591 } |
| 1592 } | |
| 1593 | |
| 1594 | |
| 1595 ////////////////////////////////////////////////////////////////////////////// | |
| 628 | 1596 // Find the gas with the shallowest change depth below or at the current depth |
| 560 | 1597 // |
| 623 | 1598 // Input: char_depth_sim simulated depth in meters |
| 1599 // sim_gas_current_num number of the currently used gas/dil | |
| 631 | 1600 // deco_gas_type[] types and state of the gases/dils |
| 1601 // char_I_deco_gas_change[] change depths of the gases/dils | |
| 623 | 1602 // |
| 628 | 1603 // Modified: sim_gas_best_num index of the gas (1..5) - only if return value is true |
| 1604 // sim_gas_best_depth switch depth - only if return value is true | |
| 623 | 1605 // |
| 1606 // Return value is TRUE if a better gas is available | |
| 560 | 1607 // |
| 628 | 1608 static unsigned char gas_find_best(void) |
| 560 | 1609 { |
| 641 | 1610 overlay unsigned char switch_depth = sim_gas_current_depth; |
| 604 | 1611 overlay unsigned char switch_gas = 0; |
| 631 | 1612 |
| 582 | 1613 |
| 628 | 1614 // loop over all gases to find the shallowest one below or at current depth |
| 604 | 1615 for( j = 0; j < NUM_GAS; ++j ) |
| 560 | 1616 { |
| 631 | 1617 // is this gas available? |
| 1618 if( ( deco_gas_type[j] & GAS_TYPE_MASK ) // gas enabled (type > 0) ? | |
| 1619 && !( deco_gas_type[j] & GAS_AVAIL_MASK ) // neither lost nor staged ? | |
| 1620 ) | |
| 1621 | |
| 1622 // is it not a deco gas unless: | |
| 1623 // extended stops are activated | |
| 1624 // OR we are on a deco stop | |
| 1625 // OR we are in bailout but not in cave mode | |
| 1626 if( ( ( deco_gas_type[j] & GAS_TYPE_MASK ) < 3 ) | |
| 1627 || ( ( main_status & EXTENDED_STOPS ) ) | |
| 1628 || ( ( deco_status & CALC_NORM ) && ( deco_info & DECO_STOPS_NORM ) ) | |
| 1629 || ( ( deco_status & CALC_ALT ) && ( deco_info & DECO_STOPS_ALT ) ) | |
| 1630 || ( ( deco_status & BAILOUT_MODE ) && !( main_status & CAVE_MODE ) ) | |
| 1631 ) | |
| 1632 | |
| 1633 // is the change depth of the this gas deeper than or | |
| 604 | 1634 // at least equal to the current depth? |
| 623 | 1635 if( char_I_deco_gas_change[j] >= char_depth_sim ) |
| 604 | 1636 |
| 631 | 1637 // is the change depth of this gas shallower than |
| 1638 // the change depth of the best gas found so far, | |
| 1639 // or is it the first better gas found? | |
| 1640 if( char_I_deco_gas_change[j] < switch_depth ) | |
| 628 | 1641 |
| 1642 #ifdef _gas_contingency | |
| 631 | 1643 // is there still enough of this gas or shall we don't care? |
| 1644 if( !(deco_gas_type[j] & GAS_FULLY_USED_UP ) | |
| 1645 || !( main_status & GAS_CONTINGENCY ) | |
| 1646 || !( main_status & CALC_VOLUME ) | |
| 1647 ) | |
| 628 | 1648 #endif |
| 604 | 1649 |
| 631 | 1650 // if there is a yes to all these questions, we have a better gas! |
| 560 | 1651 { |
| 628 | 1652 // memorize this gas (1..5) and its change depth |
| 1653 switch_gas = j+1; | |
| 1654 switch_depth = char_I_deco_gas_change[j]; | |
| 560 | 1655 } |
| 631 | 1656 |
| 560 | 1657 } // continue looping through all gases to eventually find an even better gas |
| 1658 | |
| 628 | 1659 // has a best gas been found? |
| 560 | 1660 if( switch_gas ) |
| 1661 { | |
| 628 | 1662 // YES - export the best gas and its change depth |
| 1663 sim_gas_best_num = switch_gas; | |
| 1664 sim_gas_best_depth = switch_depth; | |
| 1665 | |
| 1666 // is the best gas different from the current gas? | |
| 1667 if( sim_gas_best_num != sim_gas_current_num ) | |
| 1668 { | |
| 1669 // YES - signal advice for a gas change | |
| 1670 return 1; | |
| 1671 } | |
| 560 | 1672 } |
| 628 | 1673 |
| 1674 // no best gas found or current gas is the best gas | |
| 1675 return 0; | |
| 1676 } | |
| 1677 | |
| 1678 | |
| 1679 ////////////////////////////////////////////////////////////////////////////// | |
| 1680 // Switch to the best gas | |
| 1681 // | |
| 1682 // Input: sim_gas_best_num index of the best gas (1..5) | |
| 1683 // sim_gas_best_depth switch depth of the best gas | |
| 1684 // | |
| 1685 // Modified: sim_gas_current_num index of the new gas (1..5) | |
| 1686 // sim_gas_current_depth switch depth of the new gas | |
| 1687 // | |
| 1688 static void gas_take_best(void) | |
| 1689 { | |
| 631 | 1690 // memorize current gas as last gas used |
| 1691 sim_gas_last_num = sim_gas_current_num; | |
| 1692 | |
| 628 | 1693 // set new gas |
| 1694 sim_gas_current_num = sim_gas_best_num; | |
| 1695 sim_gas_current_depth = sim_gas_best_depth; | |
| 0 | 1696 } |
| 1697 | |
| 604 | 1698 |
| 0 | 1699 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 1700 // Set calc_N2/He/O2_ratios by sim_gas_current_num |
| 1701 // | |
| 1702 // Input: sim_gas_current_num index of gas to use | |
| 1703 // real_O2_ratio, real_He_ratio if gas = 0 (the manually set gas) | |
| 1704 // char_I_deco_O2/He_ratio[] if gas = 1..5 (the configured gases) | |
| 1705 // | |
| 1706 // Output: sim_N2_ratio, sim_He_ratio ratios of the inert gases | |
| 1707 // sim_pSCR_drop ppO2 drop in pSCR loop | |
| 0 | 1708 // |
| 582 | 1709 static void gas_set_ratios(void) |
| 0 | 1710 { |
| 582 | 1711 overlay float sim_IG_ratio; |
| 1712 | |
| 623 | 1713 assert( 0 <= sim_gas_current_num <= NUM_GAS ); |
| 1714 | |
| 1715 | |
| 1716 #ifdef _helium | |
| 582 | 1717 // get gas ratios |
| 623 | 1718 if( sim_gas_current_num == 0 ) |
| 560 | 1719 { |
| 604 | 1720 sim_O2_ratio = real_O2_ratio; |
| 1721 sim_He_ratio = real_He_ratio; | |
| 560 | 1722 } |
| 1723 else | |
| 1724 { | |
| 623 | 1725 sim_O2_ratio = 0.01 * char_I_deco_O2_ratio[sim_gas_current_num-1]; |
| 1726 sim_He_ratio = 0.01 * char_I_deco_He_ratio[sim_gas_current_num-1]; | |
| 560 | 1727 } |
| 1728 | |
| 582 | 1729 // inert gas ratio (local helper variable) |
| 604 | 1730 sim_IG_ratio = 1.00 - sim_O2_ratio; |
| 582 | 1731 |
| 1732 // N2 ratio | |
| 604 | 1733 sim_N2_ratio = sim_IG_ratio - sim_He_ratio; |
| 623 | 1734 #else |
| 1735 // get O2 ratio | |
| 1736 sim_O2_ratio = ( sim_gas_current_num == 0 ) ? real_O2_ratio : 0.01 * char_I_deco_O2_ratio[sim_gas_current_num-1]; | |
| 1737 | |
| 1738 // set H2 ratio to zero | |
| 1739 sim_He_ratio = 0.0; | |
| 1740 | |
| 1741 // inert gas ratio (local helper variable) | |
| 1742 sim_IG_ratio = 1.00 - sim_O2_ratio; | |
| 1743 | |
| 1744 // N2 ratio | |
| 1745 sim_N2_ratio = sim_IG_ratio; | |
| 1746 #endif | |
| 1747 | |
| 1748 #ifdef _ccr_pscr | |
| 582 | 1749 // ppO2 drop in pSCR loop |
| 604 | 1750 sim_pSCR_drop = sim_IG_ratio * float_pSCR_factor; |
| 623 | 1751 #endif |
| 582 | 1752 |
| 1753 | |
| 1754 assert( 0.0 <= sim_N2_ratio && sim_N2_ratio <= 0.95 ); | |
| 1755 assert( 0.0 <= sim_He_ratio && sim_He_ratio <= 0.95 ); | |
| 1756 assert( (sim_N2_ratio + sim_He_ratio) <= 0.95 ); | |
| 0 | 1757 } |
| 1758 | |
| 604 | 1759 |
| 0 | 1760 ////////////////////////////////////////////////////////////////////////////// |
| 604 | 1761 // Compute respired ppO2, ppN2 and ppHe |
| 0 | 1762 // |
| 631 | 1763 // Input: tissue_increment : selector for simulated/real tissues and gases |
| 623 | 1764 // main_status : breathing mode for real tissues |
| 1765 // deco_status : breathing mode for simulated tissues | |
| 604 | 1766 // sim_/real_O2_ratio : (simulated) O2 ratio breathed |
| 1767 // sim_/real_N2_ratio : (simulated) N2 ratio breathed | |
| 1768 // sim_/real_He_ratio : (simulated) He ratio breathed | |
| 1769 // sim_/real_pres_respiration : (simulated) respiration pressure [bar] | |
| 1770 // sim_/real_pSCR_drop : (simulated) pSCR O2 drop | |
| 1771 // pres_surface : surface pressure [bar] | |
| 1772 // char_I_const_ppO2 : ppO2 reported from sensors or setpoint [cbar] | |
| 1773 // ppWater : water-vapor pressure inside respiratory tract [bar] | |
| 0 | 1774 // |
| 604 | 1775 // Output: ppN2 : respired N2 partial pressure |
| 1776 // ppHe : respired He partial pressure | |
| 623 | 1777 // char_ppO2 : breathed ppO2 in %, used for CNS calculation |
| 0 | 1778 // |
| 582 | 1779 void calc_alveolar_pressures(void) |
| 0 | 1780 { |
| 604 | 1781 overlay float calc_pres_respiration; |
| 582 | 1782 overlay float calc_O2_ratio; |
| 1783 overlay float calc_N2_ratio; | |
| 623 | 1784 |
| 1785 #ifdef _helium | |
| 582 | 1786 overlay float calc_He_ratio; |
| 623 | 1787 #endif |
| 1788 | |
| 1789 #ifdef _ccr_pscr | |
| 582 | 1790 overlay float calc_pSCR_drop; |
| 623 | 1791 #endif |
| 582 | 1792 |
| 1793 overlay unsigned char status; | |
| 1794 | |
| 1795 | |
| 623 | 1796 assert( 0.00 <= real_N2_ratio && real_N2_ratio <= 1.00 ); |
| 1797 assert( 0.00 <= real_He_ratio && real_He_ratio <= 1.00 ); | |
| 1798 assert( (real_N2_ratio + real_He_ratio) <= 1.00 ); | |
| 604 | 1799 assert( 0.800 < real_pres_respiration && real_pres_respiration < 14.0 ); |
| 1800 | |
| 623 | 1801 assert( 0.00 <= sim_N2_ratio && real_N2_ratio <= 1.00 ); |
| 1802 assert( 0.00 <= sim_He_ratio && real_He_ratio <= 1.00 ); | |
| 1803 assert( (sim_N2_ratio + sim_He_ratio) <= 1.00 ); | |
| 582 | 1804 assert( 0.800 < sim_pres_respiration && sim_pres_respiration < 14.0 ); |
| 1805 | |
| 1806 | |
| 1807 // get input data according to context | |
| 623 | 1808 if( tissue_increment & TISSUE_SELECTOR ) |
| 582 | 1809 { |
| 1810 //---- real tissues ----------------------------------------------------------- | |
| 604 | 1811 calc_pres_respiration = real_pres_respiration; |
| 623 | 1812 |
| 1813 status = main_status; | |
| 604 | 1814 calc_O2_ratio = real_O2_ratio; |
| 1815 calc_N2_ratio = real_N2_ratio; | |
| 623 | 1816 |
| 1817 #ifdef _helium | |
| 604 | 1818 calc_He_ratio = real_He_ratio; |
| 623 | 1819 #endif |
| 1820 | |
| 1821 #ifdef _ccr_pscr | |
| 1822 calc_pSCR_drop = real_pSCR_drop; | |
| 1823 #endif | |
| 582 | 1824 } |
| 1825 else | |
| 1826 { | |
| 1827 //---- simulated tissues ------------------------------------------------------ | |
| 623 | 1828 |
| 640 | 1829 #ifdef _cave_mode |
| 1830 // in cave mode? | |
| 1831 if( !(main_status & CAVE_MODE) ) | |
| 1832 { | |
| 1833 #endif | |
| 1834 | |
| 1835 // (NO) - correct sim_pres_respiration if shallower than calculated stop depth | |
| 1836 calc_pres_respiration = ( real_pres_respiration < sim_pres_respiration ) ? real_pres_respiration : sim_pres_respiration; | |
| 1837 | |
| 1838 #ifdef _cave_mode | |
| 1839 } | |
| 1840 #endif | |
| 1841 | |
| 628 | 1842 |
| 623 | 1843 status = deco_status; |
| 604 | 1844 calc_O2_ratio = sim_O2_ratio; |
| 1845 calc_N2_ratio = sim_N2_ratio; | |
| 623 | 1846 |
| 1847 #ifdef _helium | |
| 604 | 1848 calc_He_ratio = sim_He_ratio; |
| 623 | 1849 #endif |
| 1850 | |
| 1851 #ifdef _ccr_pscr | |
| 1852 calc_pSCR_drop = sim_pSCR_drop; | |
| 1853 #endif | |
| 582 | 1854 } |
| 1855 | |
| 1856 //---- OC, CCR and Bailout Mode Gas Calculations ----------------------------------- | |
| 1857 | |
| 1858 // calculate ppO2 of pure oxygen | |
| 631 | 1859 ppO2_O2 = calc_pres_respiration - ppWater; |
| 604 | 1860 |
| 1861 // capture failure condition in case real_pres_respiration is < ppWater (should never happen...) | |
| 631 | 1862 if( ppO2_O2 < 0.0 ) ppO2_O2 = 0.0; |
| 582 | 1863 |
| 602 | 1864 // calculate ppO2 of the pure gas (OC, diluent) |
| 631 | 1865 ppO2_OC = ppO2_O2 * calc_O2_ratio; |
| 582 | 1866 |
| 623 | 1867 #ifdef _ccr_pscr |
| 1868 | |
| 582 | 1869 // calculate pSCR ppO2 |
| 631 | 1870 ppO2_pSCR = ppO2_OC - calc_pSCR_drop; |
| 1871 | |
| 1872 // capture failure condition in case ppO2_pSCR becomes negative | |
| 1873 if( ppO2_pSCR < 0.0 ) ppO2_pSCR = 0.0; | |
| 582 | 1874 |
| 1875 | |
| 1876 //---- Loop modes : adjust ppN2 and ppHe for change in ppO2 due to setpoint (CCR) or drop (pSCR) --- | |
| 623 | 1877 if( status & MODE_LOOP ) |
| 582 | 1878 { |
| 1879 overlay float const_ppO2; | |
| 604 | 1880 overlay float max_ppO2; |
| 582 | 1881 |
| 1882 // get the current sensor reading (CCR / pSCR if fitted) or the fixed setpoint (CCR) / a zero (pSCR) | |
| 1883 const_ppO2 = 0.01 * char_I_const_ppO2; | |
| 1884 | |
| 1885 // Limit the setpoint to the maximum physically possible ppO2. This prevents for | |
| 1886 // example calculating with a setpoint of 1.3 bar in only 2 meters of depth. | |
| 604 | 1887 // Additionally, the ppO2 can be further reduced to account for exhaled inert gases |
| 623 | 1888 // accumulating in the loop by the user-adjustable setting char_I_CC_max_frac_O2. |
| 604 | 1889 // (ppWater is neglected here) |
| 623 | 1890 max_ppO2 = 0.01 * char_I_CC_max_frac_O2 * calc_pres_respiration; |
| 604 | 1891 |
| 1892 if( const_ppO2 > max_ppO2 ) const_ppO2 = max_ppO2; | |
| 582 | 1893 |
| 1894 // check which kind of loop we are on | |
| 623 | 1895 if( status & MODE_PSCR ) |
| 560 | 1896 { |
| 582 | 1897 //---- pSCR Mode -------------------------------------------------------------------------- |
| 1898 | |
| 631 | 1899 // Use the sensor value if available and in real tissue context, else use calculated ppO2. |
| 1900 ppO2 = ( char_I_const_ppO2 && (tissue_increment & TISSUE_SELECTOR)) ? const_ppO2 : ppO2_pSCR; | |
| 582 | 1901 } |
| 560 | 1902 else |
| 1903 { | |
| 582 | 1904 //---- CCR Mode --------------------------------------------------------------------------- |
| 1905 | |
| 604 | 1906 // derive breathed ppO2 from (char_I_)const_ppO2, which holds sensor reading or selected setpoint |
| 582 | 1907 ppO2 = const_ppO2; |
| 560 | 1908 } |
| 1909 | |
| 604 | 1910 // adjust overall gas pressure for change in ppO2 due to setpoint (CCR) or drop (pSCR), |
| 1911 // capture potential failure conditions first: | |
| 1912 if( ( calc_pres_respiration < ppO2 ) // sensor reading or selected setpoint is higher than ambient pressure | |
| 623 | 1913 || ( calc_O2_ratio > 0.995 ) ) // diluent is pure O2, i.e. calc_N2_ratio + calc_He_ratio = 0 would give a div/0 |
| 560 | 1914 { |
| 604 | 1915 // failure condition present, set predetermined result |
| 1916 calc_pres_respiration = 0.0; | |
| 1917 } | |
| 1918 else | |
| 1919 { | |
| 1920 // no failure conditions present, equation can be executed | |
| 1921 calc_pres_respiration -= ppO2; | |
| 623 | 1922 #ifdef _helium |
| 604 | 1923 calc_pres_respiration /= calc_N2_ratio + calc_He_ratio; |
| 623 | 1924 #else |
| 1925 calc_pres_respiration /= calc_N2_ratio; | |
| 1926 #endif | |
| 560 | 1927 } |
| 582 | 1928 } |
| 1929 else | |
| 623 | 1930 #endif // _ccr_pscr |
| 604 | 1931 { |
| 1932 //---- OC mode --------------------------------------------------------------------------------- | |
| 582 | 1933 |
| 1934 // breathed ppO2 is ppO2 of pure gas | |
| 631 | 1935 ppO2 = ppO2_OC; |
| 560 | 1936 } |
| 1937 | |
| 582 | 1938 |
| 604 | 1939 //---- derive char_ppO2 in [cbar], used for calculating CNS% --------------------------------------- |
| 1940 | |
| 582 | 1941 if ( ppO2 < 0.01 ) char_ppO2 = 0; |
| 1942 else if ( ppO2 >= 2.545 ) char_ppO2 = 255; | |
| 1943 else char_ppO2 = (unsigned char)(100 * ppO2 + 0.5); | |
| 1944 | |
| 1945 | |
| 1946 //---- calculate ppN2 and ppHe --------------------------------------------------------------------- | |
| 1947 | |
| 604 | 1948 // compute ppN2 and ppHe, capture potential failure conditions first: |
| 1949 if( calc_pres_respiration > ppWater ) | |
| 582 | 1950 { |
| 604 | 1951 // subtract water vapor pressure |
| 1952 calc_pres_respiration -= ppWater; | |
| 1953 | |
| 1954 // calculate partial pressures | |
| 1955 ppN2 = calc_N2_ratio * calc_pres_respiration; | |
| 623 | 1956 |
| 1957 #ifdef _helium | |
| 604 | 1958 ppHe = calc_He_ratio * calc_pres_respiration; |
| 623 | 1959 #else |
| 1960 ppHe = 0.0; | |
| 1961 #endif | |
| 1962 | |
| 582 | 1963 } |
| 1964 else | |
| 1965 { | |
| 604 | 1966 // calculated respired pressure is < water vapor pressure, thus set ppN2 and ppHe to 0 |
| 582 | 1967 ppN2 = 0.0; |
| 1968 ppHe = 0.0; | |
| 1969 } | |
| 628 | 1970 |
| 634 | 1971 #ifdef _ccr_pscr |
| 628 | 1972 // calculating real tissues? |
| 1973 if( tissue_increment & TISSUE_SELECTOR ) | |
| 1974 { | |
| 1975 overlay unsigned char temp; | |
| 1976 | |
| 1977 // compute gas density of current mix in multiples of 0.01 grams per liter | |
| 643 | 1978 int_O_gas_density = (unsigned int)( GAS_DENSITY_He_FACTOR * ppHe + GAS_DENSITY_N2_FACTOR * ppN2 + GAS_DENSITY_O2_FACTOR * ppO2 ); |
| 628 | 1979 |
| 634 | 1980 // convert gas density into an 8 bit integer, scaling 0.1 grams per liter |
| 628 | 1981 temp = (unsigned char)( (int_O_gas_density + 9) / 10 ); |
| 1982 | |
| 1983 // limit to display max and set warning or attention flag | |
| 634 | 1984 if( temp > 99 ) int_O_gas_density = 999 | INT_FLAG_WARNING; |
| 1985 else if( temp >= char_I_gas_density_warn ) int_O_gas_density |= INT_FLAG_WARNING; | |
| 1986 else if( temp >= char_I_gas_density_att ) int_O_gas_density |= INT_FLAG_ATTENTION; | |
| 628 | 1987 } |
| 1988 #endif | |
| 0 | 1989 } |
| 1990 | |
| 604 | 1991 |
| 0 | 1992 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 1993 // Initializes all output variables to their default values |
| 1994 // | |
| 1995 static void init_output_vars(void) | |
| 1996 { | |
| 1997 // clear the internal stops table from remains lasting from the previous dive or deco calculator run | |
| 1998 clear_deco_table(); | |
| 1999 | |
| 2000 // publish the cleared stops table to the display functions | |
| 2001 publish_deco_table(); | |
| 2002 | |
| 2003 // clear the published gas needs in volume and pressure | |
| 2004 for( i = 0; i < NUM_GAS; ++i ) | |
| 2005 { | |
| 2006 int_O_gas_need_vol[i] = 0; | |
| 2007 int_O_gas_need_pres[i] = 0 + INT_FLAG_ZERO + INT_FLAG_INVALID; | |
| 2008 } | |
| 2009 | |
| 2010 // values initially to be set to zero | |
| 2011 int_O_ceiling = 0; // ceiling depth in mbar | |
| 2012 char_O_deco_info = 0; // clear all deco information flags | |
| 2013 char_O_deco_warnings = 0; // clear all deco warning flags | |
| 2014 | |
| 2015 // default desaturation time to 24 hours (it will not be computed during a dive) | |
| 2016 int_O_desaturation_time = 1440; | |
| 2017 | |
| 2018 // initialize CNS values | |
| 2019 int_O_CNS_norm = 0 + INT_FLAG_INVALID; | |
| 2020 int_O_CNS_alt = 0 + INT_FLAG_INVALID; | |
| 2021 | |
| 2022 // initialize NDL times | |
| 631 | 2023 int_O_NDL_norm = 240; |
| 2024 int_O_NDL_alt = 240; | |
| 2025 | |
| 2026 // initialize stop times | |
| 2027 int_O_TST_norm = 0; | |
| 2028 int_O_TST_alt = 0 + INT_FLAG_INVALID + INT_FLAG_NOT_COMPUTED_YET + INT_FLAG_ZERO; | |
| 2029 | |
| 2030 | |
| 2031 // initialize ascent / return times | |
| 623 | 2032 int_O_TTS_norm = 0; |
| 2033 int_O_TTS_alt = 0 + INT_FLAG_INVALID + INT_FLAG_NOT_COMPUTED_YET; | |
| 2034 | |
| 2035 #ifdef _rx_functions | |
| 2036 // clear TR values | |
| 2037 int_O_SAC_measured = 0 + INT_FLAG_NOT_AVAIL; // SAC rate | |
| 2038 int_O_pressure_need[0] = 0 + INT_FLAG_NOT_AVAIL; // pressure need to reading 1 | |
| 2039 int_O_pressure_need[1] = 0 + INT_FLAG_NOT_AVAIL; // pressure need to reading 2 | |
| 628 | 2040 int_O_tank_pressure = 0; // tank pressure for logging |
| 623 | 2041 #endif |
| 2042 | |
| 628 | 2043 #ifdef _helium |
| 2044 int_O_gas_density = 0; | |
| 2045 #endif | |
| 2046 | |
| 2047 // also clear any time++ request | |
| 2048 char_I_sim_advance_time = 0; | |
| 623 | 2049 } |
| 2050 | |
| 2051 | |
| 2052 ////////////////////////////////////////////////////////////////////////////// | |
| 2053 // Reset all tissues to surface pressure equilibrium state | |
| 2054 // | |
| 2055 // Input: int_I_pres_surface current surface pressure in hPa (mbar) | |
| 2056 // | |
| 2057 // Output: real_pres_tissue_N2[] partial pressure of N2 in real tissues | |
| 2058 // real_pres_tissue_He[] partial pressure of He in real tissues | |
| 2059 // char_O_tissue_pres_N2[] partial pressure of N2 for tissue graphics | |
| 2060 // char_O_tissue_pres_He[] partial pressure of He for tissue graphics | |
| 2061 // char_O_tissue_pressure[] total pressure for tissue graphics | |
| 2062 // CNS_fraction_real internal CNS value | |
| 2063 // int_O_CNS_current current CNS value | |
| 2064 // int_O_CNS_norm CNS value at end of normal dive plan | |
| 2065 // int_O_CNS_alt CNS value at end of alternative dive plan | |
| 2066 // char_O_deco_warnings deco warnings vector | |
| 631 | 2067 // int_O_NDL_norm remaining NDL time in normal dive plan |
| 2068 // int_O_NDL_alt remaining NDL time in alternative dive plan | |
| 623 | 2069 // int_O_TTS_norm ascent time (TTS) in normal dive plan |
| 2070 // int_O_TTS_alt ascent time (TTS) in alternative dive plan | |
| 2071 // int_O_lead_supersat supersaturation of the leading tissue | |
| 0 | 2072 // |
| 2073 static void clear_tissue(void) | |
| 2074 { | |
| 623 | 2075 // safeguard and convert the surface pressure (mbar -> bar) (*) |
| 2076 if( int_I_pres_surface < 500 ) pres_surface = 0.500; | |
| 2077 else pres_surface = 0.001 * int_I_pres_surface; | |
| 2078 | |
| 2079 // calculate partial pressure of N2 in respired air at surface pressure | |
| 2080 calc_N2_equilibrium(); | |
| 2081 | |
| 2082 // cycle through the 16 Buhlmann tissues | |
| 604 | 2083 for( ci = 0; ci < NUM_COMP; ci++ ) |
| 582 | 2084 { |
| 623 | 2085 // reset tissue pressures |
| 2086 real_pres_tissue_He[ci] = 0.0; // He | |
| 2087 real_pres_tissue_N2[ci] = N2_equilibrium; // N2 | |
| 2088 | |
| 650 | 2089 real_pres_delta_He[ci] = 0.0; // He |
| 2090 real_pres_delta_N2[ci] = 0.0; // N2 | |
| 2091 | |
| 629 | 2092 // reset tissue pressures for scaled tissue graphics |
| 631 | 2093 char_O_tissue_pres_He[ci] = 0; // He |
| 623 | 2094 char_O_tissue_pres_N2[ci] = 10; // N2 |
| 2095 char_O_tissue_pressure[ci] = 10; // combined | |
| 582 | 2096 } |
| 2097 | |
| 2098 // reset CNS values | |
| 623 | 2099 CNS_fraction_real = 0.0; |
| 2100 int_O_CNS_current = int_O_CNS_norm = int_O_CNS_alt = 0; | |
| 582 | 2101 |
| 2102 // reset some more vars to their defaults | |
| 631 | 2103 int_O_NDL_norm = 240; |
| 2104 int_O_NDL_alt = 240; | |
| 2105 int_O_TST_norm = 0; | |
| 2106 int_O_TST_alt = 0 + INT_FLAG_ZERO; | |
| 2107 int_O_TTS_norm = 0; | |
| 2108 int_O_TTS_alt = 0; | |
| 2109 int_O_lead_supersat = 0; | |
| 623 | 2110 |
| 2111 // reset all warning and info flags | |
| 631 | 2112 char_O_deco_warnings = 0; |
| 2113 char_O_deco_info = 0; | |
| 0 | 2114 } |
| 2115 | |
| 582 | 2116 |
| 0 | 2117 ////////////////////////////////////////////////////////////////////////////// |
| 628 | 2118 // Deco engine main code |
| 0 | 2119 // |
| 623 | 2120 // This is the major code in dive mode, it calculates the tissue pressures, |
| 2121 // the bottom time, and it calculates the ascend with all deco stops, etc. | |
| 2122 // | |
| 2123 // Input: char_O_main_status deco engine control and real tissues mode | |
| 2124 // char_O_deco_status deco engine control and simulated tissues mode | |
| 2125 // char_I_sim_advance_time mailbox for bottom time incrementing | |
| 2126 // | |
| 2127 // char_I_SAC_work gas usage rate during working phase in l/min | |
| 2128 // char_I_SAC_deco gas usage rate during deco stops phase in l/min | |
| 2129 // | |
| 631 | 2130 // char_I_model selector for GF extension |
| 623 | 2131 // char_I_saturation_multiplier safety factor for tissue saturation |
| 2132 // char_I_desaturation_multiplier safety factor for tissue desaturation | |
| 2133 // | |
| 631 | 2134 // char_I_pressure_gas[] amount of gas available for ascent / cave return in bar |
| 623 | 2135 // int_I_pressure_drop[] pressure drop used to calculate SAC rate |
| 2136 // char_I_gas_avail_size[] size of the tanks in liters | |
| 2137 // | |
| 2138 // Output: int_O_O2_ppO2 partial pressure of pure O2 at current depth | |
| 2139 // int_O_pure_ppO2 partial pressure of O2 in gas at current depth | |
| 2140 // int_O_pSCR_ppO2 partial pressure of O2 in gas at current depth, corrected for pSCR mode | |
| 2141 // int_O_breathed_ppO2 partial pressure of O2 currently breathed | |
| 2142 // | |
| 2143 // char_O_deco_status deco engine computations status | |
| 2144 // char_O_deco_info deco engine information vector | |
| 2145 // char_O_deco_warnings deco engine warnings vector | |
| 2146 // | |
| 631 | 2147 // int_O_NDL_norm remaining NDL time in normal dive plan |
| 2148 // int_O_NDL_alt remaining NDL time in alternative dive plan | |
| 623 | 2149 // int_O_TTS_norm ascent time (TTS) in normal dive plan |
| 2150 // int_O_TTS_alt ascent time (TTS) in alternative dive plan | |
| 2151 // int_O_CNS_norm CNS value at end of normal dive plan | |
| 2152 // int_O_CNS_alt CNS value at end of alternative dive plan | |
| 2153 // | |
| 631 | 2154 // int_O_gas_need_vol[] calculated gas volumes needed for ascent / cave return |
| 2155 // int_O_gas_need_pres[] calculated gas pressures needed for ascent / cave return | |
| 623 | 2156 // |
| 2157 // int_O_SAC_measured measured surface air consumption (SAC) rate in l/min | |
| 2158 // | |
| 2159 // Modified: int_IO_pressure_value[] warning flags added to pressure reading 1 & 2 | |
| 2160 // int_IO_pressure_need[] pressure needs to pressure reading 1 & 2 | |
| 0 | 2161 // |
| 2162 static void calc_hauptroutine(void) | |
| 2163 { | |
| 623 | 2164 overlay unsigned short int_ppO2_min; |
| 628 | 2165 overlay unsigned short int_ppO2_max_warn; |
| 2166 overlay unsigned short int_ppO2_max_att; | |
| 623 | 2167 overlay unsigned short int_ppO2_max_dil; |
| 631 | 2168 overlay float EAD_pres; |
| 2169 overlay float END_pres; | |
| 623 | 2170 |
| 2171 //============================================================================================= | |
| 2172 | |
| 2173 // | |
| 2174 //--- Setup Part --------------------------------------------------------------------------------- | |
| 2175 // | |
| 2176 | |
| 2177 // set time limit for preempting deco calculations, timer is 16 bit and increments every 1/32 ms | |
| 2178 tmr5_value = 65535 - (32 * BUDGET_PER_SECOND / INVOKES_PER_SECOND); | |
| 2179 | |
| 2180 // load timer | |
| 2181 load_tmr5(); | |
| 2182 | |
| 2183 // read command flags and set up what to do | |
| 2184 switch( char_O_deco_status & COMMAND_MASK ) | |
| 560 | 2185 { |
| 623 | 2186 |
| 2187 case INITIALIZE: | |
| 2188 case INITIALIZE_START_NORM: | |
| 2189 case INITIALIZE_START_ALT: | |
| 2190 | |
| 2191 // copy master modes to shadow registers | |
| 2192 main_status = char_O_main_status; | |
| 2193 deco_status = char_O_deco_status; | |
| 2194 | |
| 650 | 2195 // clear all command flags on the master mode to signal that the command is read and in processing |
| 623 | 2196 char_O_deco_status &= ~COMMAND_MASK; |
| 2197 | |
| 2198 // clear the initialization flag on the shadow copy | |
| 2199 deco_status &= ~INITIALIZE; | |
| 2200 | |
| 2201 // initialize the sequence timer | |
| 2202 sequence_timer = 0; | |
| 2203 | |
| 2204 // set the calculation phase to start with to doing the once-per-dive initialization | |
| 2205 next_planning_phase = PHASE_10_DIVE_INIT; | |
| 2206 | |
| 2207 break; | |
| 2208 | |
| 2209 | |
| 2210 case START_NORM: | |
| 2211 case START_ALT: | |
| 2212 | |
| 2213 // copy master modes to shadow registers | |
| 2214 main_status = char_O_main_status; | |
| 2215 deco_status = char_O_deco_status; | |
| 2216 | |
| 650 | 2217 // clear all command flags on the master mode to signal that the command is read and in processing |
| 623 | 2218 char_O_deco_status &= ~COMMAND_MASK; |
| 2219 | |
| 2220 // set the calculation phase to start with to doing the cyclic initialization | |
| 628 | 2221 next_planning_phase = PHASE_20_CYCLIC_INIT; |
| 623 | 2222 |
| 2223 // continue in CALCULATING | |
| 2224 | |
| 2225 | |
| 2226 case CALCULATING: | |
| 2227 | |
| 2228 // keep current calculation phase | |
| 2229 | |
| 2230 // step the sequence timer | |
| 2231 sequence_timer = (sequence_timer < INVOKES_PER_SECOND * 2 - 1) ? sequence_timer + 1 : 0; | |
| 2232 | |
| 2233 break; | |
| 560 | 2234 } |
| 2235 | |
| 582 | 2236 |
| 623 | 2237 // |
| 2238 //--- End of Setup Part ----------------------------------------------------------------------- | |
| 2239 // | |
| 2240 | |
| 2241 //============================================================================================= | |
| 2242 | |
| 2243 // | |
| 2244 //---- Calculations Part (real Tissues) ------------------------------------------------------- | |
| 2245 // | |
| 2246 | |
| 582 | 2247 |
| 604 | 2248 // target the real tissues with 2 second increments by default |
| 623 | 2249 tissue_increment = TISSUE_SELECTOR | 0; |
| 2250 | |
| 2251 | |
| 2252 // Tasks every second, if more than 1 invocation per second: on the first section of the second. | |
| 2253 // Requests for tissue "fast forward" are executed immediately. | |
| 2254 #if (INVOKES_PER_SECOND > 1) | |
| 2255 if( ( sequence_timer == 0 ) | |
| 2256 || ( sequence_timer == INVOKES_PER_SECOND ) | |
| 2257 || ( char_I_sim_advance_time > 0 ) | |
| 2258 ) | |
| 2259 #endif | |
| 584 | 2260 { |
| 623 | 2261 // acquire current environmental data |
| 2262 calc_hauptroutine_data_input(); | |
| 2263 | |
| 628 | 2264 // calculate ppO2, ppN2 and ppHe for real tissues |
| 623 | 2265 calc_alveolar_pressures(); |
| 2266 | |
| 2267 // add decent calculation here and include trigger in above if-statement | |
| 2268 // TODO | |
| 2269 | |
| 2270 } // tasks every second, on the first section of the second | |
| 2271 | |
| 2272 | |
| 2273 // Tasks every 2 seconds, on the first section of the respective second. | |
| 2274 // Requests for tissue "fast forward" are executed immediately. | |
| 2275 if( ( sequence_timer == 0 ) | |
| 2276 || ( char_I_sim_advance_time > 0 ) | |
| 2277 ) | |
| 2278 { | |
| 2279 // Tissue and CNS updates are based on 2 seconds periods! | |
| 2280 | |
| 604 | 2281 // Set up normal tissue updating or "fast forward" updating for simulator |
| 2282 // sim+5' function and deco calculator bottom time calculation. | |
| 2283 if( char_I_sim_advance_time > 0 ) | |
| 2284 { | |
| 2285 // configure "fast forward" tissue updating | |
| 623 | 2286 tissue_increment = TISSUE_SELECTOR | char_I_sim_advance_time; |
| 2287 | |
| 2288 // clear the request | |
| 604 | 2289 char_I_sim_advance_time = 0; |
| 2290 } | |
| 2291 | |
| 584 | 2292 // calculate the real tissues |
| 2293 calc_tissues(); | |
| 2294 | |
| 604 | 2295 // update the CNS value for the real tissues |
| 2296 calc_CNS(); | |
| 2297 | |
| 2298 // calculate ceiling (at GF_high or 100%) and leading tissue supersaturation | |
| 631 | 2299 if ( char_I_model ) calc_limit(GF_high); // GF factors enabled |
| 2300 else calc_limit( 1.0 ); // classic Buhlmann | |
| 623 | 2301 |
| 2302 // convert the ceiling value to integer | |
| 604 | 2303 convert_ceiling_for_display(); |
| 2304 | |
| 623 | 2305 // convert the saturation value of the leading tissue to integer |
| 2306 convert_sat_for_display(); | |
| 2307 | |
| 2308 // convert the CNS value to integer | |
| 2309 convert_cur_CNS_for_display(); | |
| 2310 | |
| 2311 } // tasks every 2 seconds | |
| 2312 | |
| 2313 | |
| 2314 // Tasks every second, if more than 1 invocation per second: on the first section of the second. | |
| 2315 #if (INVOKES_PER_SECOND > 1) | |
| 2316 if( ( sequence_timer == 0 ) | |
| 2317 || ( sequence_timer == INVOKES_PER_SECOND ) | |
| 2318 ) | |
| 2319 #endif | |
| 582 | 2320 { |
| 623 | 2321 //---- Calculate and Export EAD and END ------------------------------------------------------ |
| 2322 | |
| 631 | 2323 // calculate EAD (Equivalent Air Depth) as pressure in [bar]: |
| 2324 // equivalent depth for the same N2 level with plain air | |
| 2325 EAD_pres = ppN2 / 0.7902 + ppWater - pres_surface; | |
| 2326 | |
| 2327 // calculate END (Equivalent Narcotic Depth) as pressure in [bar]: | |
| 2328 // as before, but with O2 treated as narcotic, too | |
| 2329 // Source: The Physiology and Medicine of Diving by Peter Bennett and David Elliott, | |
| 2330 // 4th edition, 1993, W.B.Saunders Company Ltd, London. | |
| 2331 END_pres = real_pres_respiration - ppHe - pres_surface; | |
| 2332 | |
| 2333 | |
| 2334 // export EAD, factor 10 is because conversion delivers in [cbar] but we need [mbar] | |
| 2335 float_value = EAD_pres; convert_float_to_int(); int_O_EAD_pres = int_value * 10; | |
| 2336 | |
| 2337 // export END, factor 10 is because conversion delivers in [cbar] but we need [mbar] | |
| 2338 float_value = END_pres; convert_float_to_int(); int_O_END_pres = int_value * 10; | |
| 623 | 2339 |
| 2340 | |
| 2341 //---- Compute ppO2 Values in [cbar] --------------------------------------------------------- | |
| 2342 | |
| 2343 float_value = ppO2; convert_float_to_int(); int_O_breathed_ppO2 = int_value; // breathed gas | |
| 2344 #ifdef _ccr_pscr | |
| 631 | 2345 float_value = ppO2_O2; convert_float_to_int(); int_O_O2_ppO2 = int_value; // pure oxygen |
| 2346 float_value = ppO2_OC; convert_float_to_int(); int_O_pure_ppO2 = int_value; // pure gas | |
| 2347 float_value = ppO2_pSCR; convert_float_to_int(); int_O_pSCR_ppO2 = int_value; // pSCR calculated | |
| 623 | 2348 #endif |
| 2349 | |
| 2350 | |
| 628 | 2351 //---- Set/Clear Deco Mode ------------------------------------------------------------------ |
| 2352 | |
| 2353 // Clear the deco mode flag if: | |
| 2354 // deco mode is set | |
| 2355 // AND we are deeper than 7 meters below the deepest deco stop | |
| 2356 // (7 meters chosen as to be 2 stop depth intervals plus 1 additional meter below) | |
| 2357 if ( ( deco_info & DECO_MODE ) > 0 ) | |
| 2358 if ( ( char_depth_real ) > char_O_deco_depth[0] + 7 ) | |
| 650 | 2359 deco_info &= ~DECO_MODE; |
| 623 | 2360 |
| 2361 // Set the deco mode flag if: | |
| 2362 // deco mode is not set | |
| 2363 // AND breathing an OC deco gas (gas type 3) | |
| 2364 // OR breathing a gas or diluent that officially is disabled (type 0) | |
| 628 | 2365 // OR there is a deco stop |
| 631 | 2366 // |
| 2367 // Remark: when breathing a gas, its lost & staged flags are cleared | |
| 2368 // | |
| 628 | 2369 if ( ( deco_info & DECO_MODE ) == 0 ) |
| 2370 if ( ( char_I_current_gas_type == 3 ) | |
| 2371 || ( char_I_current_gas_type == 0 ) | |
| 2372 || ( char_O_deco_depth[0] > 0 ) | |
| 623 | 2373 ) |
| 650 | 2374 deco_info |= DECO_MODE; |
| 623 | 2375 |
| 2376 | |
| 2377 //---- Compute ppO2 Warnings ------------------------------------------------------------------ | |
| 2378 | |
| 628 | 2379 // compute conditional min value |
| 623 | 2380 #ifdef _ccr_pscr |
| 2381 int_ppO2_min = ( main_status & MODE_LOOP ) ? (unsigned short)char_I_ppO2_min_loop : (unsigned short)char_I_ppO2_min; | |
| 2382 #else | |
| 2383 int_ppO2_min = (unsigned short)char_I_ppO2_min; | |
| 2384 #endif | |
| 2385 | |
| 628 | 2386 // determine the absolute max value (should be the deco one, but who knows...) |
| 2387 int_ppO2_max_warn = ( char_I_ppO2_max_work > char_I_ppO2_max_deco) ? char_I_ppO2_max_work : char_I_ppO2_max_deco; | |
| 2388 | |
| 2389 // add some margin to compensate for surface pressures > 1.000 mbar | |
| 2390 int_ppO2_max_warn += ppO2_MARGIN_ON_MAX; | |
| 2391 | |
| 2392 // determine the normal max value | |
| 2393 int_ppO2_max_att = ( deco_info & DECO_MODE ) ? (unsigned short)char_I_ppO2_max_deco : (unsigned short)char_I_ppO2_max_work; | |
| 2394 | |
| 2395 // add some margin to compensate for surface pressures > 1.000 mbar | |
| 2396 int_ppO2_max_att += ppO2_MARGIN_ON_MAX; | |
| 623 | 2397 |
| 2398 #ifdef _ccr_pscr | |
| 628 | 2399 // default value for the upper diluent ppO2 warning threshold is the upper warning threshold |
| 2400 int_ppO2_max_dil = int_ppO2_max_warn; | |
| 2401 | |
| 2402 // when enabled and in CCR mode, the upper diluent warning threshold gets adjust according to the current setpoint | |
| 631 | 2403 if( char_I_dil_check ) |
| 623 | 2404 if( (main_status & MODE_MASK) == MODE_CCR ) |
| 2405 { | |
| 2406 overlay unsigned short max_dil; | |
| 2407 | |
| 2408 // The upper diluent ppO2 threshold is ppO2_GAP_TO_SETPOINT below the setpoint... | |
| 2409 // (the condition protects from negative numbers which would cause a wrap-around in unsigned integers) | |
| 2410 max_dil = (char_I_const_ppO2 > ppO2_GAP_TO_SETPOINT) ? (unsigned short)(char_I_const_ppO2 - ppO2_GAP_TO_SETPOINT) : 0; | |
| 2411 | |
| 628 | 2412 // ...but never above int_ppO2_max_warn |
| 2413 if( max_dil < int_ppO2_max_warn ) int_ppO2_max_dil = max_dil; | |
| 623 | 2414 |
| 2415 // We do not need to guard int_ppO2_max_dil against becoming lower than char_I_ppO2_min because the check | |
| 2416 // against char_I_ppO2_min is done first and will then raise a low warning and inhibit further checks. | |
| 2417 } | |
| 2418 #endif | |
| 2419 | |
| 2420 // check for safe range of breathed gas | |
| 628 | 2421 if ( int_O_breathed_ppO2 <= int_ppO2_min ) int_O_breathed_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; |
| 2422 else if ( int_O_breathed_ppO2 >= int_ppO2_max_warn ) int_O_breathed_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; | |
| 2423 else if ( deco_info & DECO_MODE ) ; // no attention generated in deco mode | |
| 2424 else if ( main_status & MODE_LOOP ) ; // no attention generated in loop modes | |
| 2425 else if ( int_O_breathed_ppO2 >= int_ppO2_max_att ) int_O_breathed_ppO2 |= INT_FLAG_ATTENTION; | |
| 623 | 2426 |
| 2427 #ifdef _ccr_pscr | |
| 2428 // check for safe range of pure oxygen | |
| 628 | 2429 if ( int_O_O2_ppO2 >= int_ppO2_max_warn ) int_O_O2_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; |
| 623 | 2430 |
| 2431 // check for safe range of pure diluent | |
| 628 | 2432 if ( int_O_pure_ppO2 <= (unsigned short)char_I_ppO2_min ) int_O_pure_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; |
| 2433 else if ( int_O_pure_ppO2 >= int_ppO2_max_warn ) int_O_pure_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; | |
| 2434 else if ( int_O_pure_ppO2 >= int_ppO2_max_dil ) int_O_pure_ppO2 |= INT_FLAG_ATTENTION; | |
| 623 | 2435 |
| 2436 // check for safe range of calculated pSCR loop gas | |
| 628 | 2437 if ( int_O_pSCR_ppO2 <= int_ppO2_min ) int_O_pSCR_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; |
| 2438 else if ( int_O_pSCR_ppO2 >= int_ppO2_max_warn ) int_O_pSCR_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; | |
| 623 | 2439 #endif |
| 2440 | |
| 2441 } // tasks every second / on the first section of the second | |
| 604 | 2442 |
| 2443 | |
| 2444 #ifdef _rx_functions | |
| 2445 | |
| 623 | 2446 // only when TR functions are enabled |
| 2447 if( main_status & TR_FUNCTIONS ) | |
| 2448 | |
| 2449 // Tasks every second, if more than 1 invocation per second: on the second section of the second. | |
| 2450 #if (INVOKES_PER_SECOND > 1) | |
| 2451 if( ( sequence_timer == 1 ) | |
| 2452 || ( sequence_timer == INVOKES_PER_SECOND + 1 ) | |
| 2453 ) | |
| 2454 #endif | |
| 604 | 2455 { |
| 623 | 2456 calc_TR_functions(); |
| 2457 } | |
| 2458 | |
| 2459 #endif // _rx_functions | |
| 2460 | |
| 2461 | |
| 2462 // | |
| 604 | 2463 //---- End of Computations for the real Tissues ----------------------------------------------- |
| 2464 // | |
| 623 | 2465 |
| 604 | 2466 //============================================================================================= |
| 623 | 2467 |
| 604 | 2468 // |
| 623 | 2469 //---- Begin of Computations for Ascent and Decompression (simulated Tissues) ----------------- |
| 2470 // | |
| 2471 | |
| 2472 // Dispatcher: select what to do based on the current calculation phase | |
| 2473 do | |
| 582 | 2474 { |
| 623 | 2475 |
| 2476 #ifdef _profiling | |
| 2477 profiling_phase = next_planning_phase; | |
| 2478 #endif | |
| 2479 | |
| 2480 switch( next_planning_phase ) | |
| 560 | 2481 { |
| 623 | 2482 |
| 2483 // | |
| 2484 //---- once-per-dive Initialization of the Deco Engine ------------------------------------ | |
| 2485 // | |
| 2486 case PHASE_10_DIVE_INIT: | |
| 2487 | |
| 2488 // initialize all output variables to defaults | |
| 2489 init_output_vars(); | |
| 2490 | |
| 582 | 2491 // initialize values that will be recalculated later on periodically |
| 631 | 2492 deco_warnings = 0; // reset all deco warnings |
| 2493 deco_info = 0; // reset all deco infos | |
| 2494 IBCD_tissue_vector = 0; // reset tissue IBCD vector | |
| 2495 NDL_tissue_start_norm = 0; // initialize the tissue to start with when calculating normal NDL time | |
| 2496 NDL_tissue_start_alt = 0; // initialize the tissue to start with when calculating alternative NDL time | |
| 623 | 2497 |
| 2498 // enforce initialization of GF data on first cyclic initialization | |
| 631 | 2499 GF_high_last = 255; |
| 2500 GF_low_last = 255; | |
| 2501 | |
| 2502 | |
| 2503 // calculate volumes available for each gas | |
| 2504 for( i = 0; i < NUM_GAS; i++ ) | |
| 628 | 2505 { |
| 631 | 2506 // total available volume = tank size * fill press, char_I_gas_avail_pres is in multiples of 10 bar |
| 2507 gas_volume_avail[i] = (float)char_I_gas_avail_size[i] * (float)char_I_gas_avail_pres[i] * 10.0; | |
| 2508 | |
| 2509 // attention threshold | |
| 2510 gas_volume_atten[i] = gas_volume_avail[i] * GAS_NEEDS_ATTENTION; | |
| 628 | 2511 } |
| 631 | 2512 |
| 623 | 2513 |
| 2514 #ifdef _profiling | |
| 2515 int_O_profiling_overrun_max = 0; | |
| 2516 char_O_profiling_runs_norm = 0; | |
| 2517 char_O_profiling_runs_alt = 0; | |
| 2518 #endif | |
| 2519 | |
| 2520 | |
| 2521 // the next calculation phase will do the cyclic initialization of the deco engine if a | |
| 2522 // normal or alternative plan shall be calculated, else the calculation cycle is done. | |
| 628 | 2523 if( deco_status & PLAN_MASK ) next_planning_phase = PHASE_20_CYCLIC_INIT; |
| 623 | 2524 else next_planning_phase = PHASE_00_DONE; |
| 2525 | |
| 2526 break; | |
| 2527 | |
| 582 | 2528 |
| 2529 // | |
| 628 | 2530 //---- once-per-cycle Initialization of the Deco Engine ----------------------------------- |
| 582 | 2531 // |
| 628 | 2532 case PHASE_20_CYCLIC_INIT: |
| 623 | 2533 |
| 2534 // target the simulated tissues (flag bit 7 = 0) | |
| 2535 tissue_increment = 0; | |
| 2536 | |
| 2537 // clear the internal stops table | |
| 582 | 2538 clear_deco_table(); |
| 604 | 2539 |
| 631 | 2540 // clear deco stops info |
| 2541 if( deco_status & CALC_NORM ) deco_info &= ~DECO_STOPS_NORM; | |
| 2542 else deco_info &= ~DECO_STOPS_ALT; | |
| 2543 | |
| 560 | 2544 // initialize the simulated tissues with the current state of the real tissues |
| 650 | 2545 memcpy(sim_pres_tissue_N2, real_pres_tissue_N2, 256); |
| 582 | 2546 |
| 631 | 2547 // initialize the gas types |
| 2548 for( i = 0; i < NUM_GAS; i++ ) | |
| 2549 { | |
| 2550 deco_gas_type[i] = char_I_deco_gas_type[i]; | |
| 2551 } | |
| 2552 | |
| 2553 #ifdef _gas_contingency | |
| 2554 // if in gas contingency mode, | |
| 2555 // check if there are multiple tanks with the same gas | |
| 2556 // (or at least with the same change depth...) | |
| 2557 if( main_status & GAS_CONTINGENCY ) | |
| 2558 { | |
| 2559 for( i = 0; i < NUM_GAS; i++ ) | |
| 2560 { | |
| 2561 // default to no peer tanks existing | |
| 2562 peer_tank[i] = 0; | |
| 2563 | |
| 2564 // tank enabled? | |
| 2565 if( char_I_deco_gas_type[i] ) | |
| 2566 { | |
| 2567 // YES - check for peer tanks | |
| 2568 for( j = 0; j < NUM_GAS; j++ ) | |
| 2569 { | |
| 2570 // do not check a tank against itself | |
| 2571 if( i == j ) continue; | |
| 2572 | |
| 2573 // is the other tank also enabled and does it have the same change depth? | |
| 2574 if( char_I_deco_gas_type[j] & GAS_TYPE_MASK ) | |
| 2575 if( char_I_deco_gas_change[i] == char_I_deco_gas_change[j] ) | |
| 2576 { | |
| 2577 // YES - memorize it as a peer tank | |
| 2578 peer_tank[i] |= (1 << j); | |
| 2579 } | |
| 2580 } | |
| 2581 } | |
| 2582 } | |
| 2583 } | |
| 2584 #endif | |
| 2585 | |
| 623 | 2586 // initialize GF parameters if using GF model |
| 631 | 2587 if( char_I_model != 0 ) |
| 604 | 2588 { |
| 623 | 2589 // update GF parameters (GFs may have been switched between GF and aGF) |
| 628 | 2590 if( (char_I_GF_Low_percentage != GF_low_last) || (char_I_GF_High_percentage != GF_high_last) ) |
| 604 | 2591 { |
| 623 | 2592 // store new values in integer format |
| 628 | 2593 GF_low_last = char_I_GF_Low_percentage; |
| 623 | 2594 GF_high_last = char_I_GF_High_percentage; |
| 628 | 2595 |
| 2596 // safeguard and store new values in float format | |
| 2597 GF_low = ( GF_low_last > 10 ) ? 0.01 * GF_low_last : 0.10 ; | |
| 2598 GF_high = ( GF_high_last > GF_low_last ) ? 0.01 * GF_high_last : GF_low; | |
| 2599 | |
| 623 | 2600 |
| 2601 // reset low depth references and slopes | |
| 631 | 2602 GF_depth_norm = 0; |
| 2603 GF_depth_alt = 0; | |
| 2604 GF_slope_norm = 0.0; | |
| 2605 GF_slope_alt = 0.0; | |
| 604 | 2606 } |
| 623 | 2607 |
| 2608 // retrieve GF parameters for current calculation cycle | |
| 2609 if( deco_status & CALC_NORM ) | |
| 560 | 2610 { |
| 631 | 2611 GF_depth = GF_depth_norm; |
| 2612 GF_slope = GF_slope_norm; | |
| 560 | 2613 } |
| 2614 else | |
| 2615 { | |
| 631 | 2616 GF_depth = GF_depth_alt; |
| 2617 GF_slope = GF_slope_alt; | |
| 560 | 2618 } |
| 604 | 2619 } |
| 2620 | |
| 623 | 2621 // initialize the simulated CNS value with the current CNS value of the real tissues |
| 2622 CNS_fraction_sim = CNS_fraction_real; | |
| 2623 | |
| 631 | 2624 // initialize the simulated pressure with the current real pressure |
| 623 | 2625 sim_pres_respiration = real_pres_respiration; |
| 631 | 2626 |
| 2627 // initialize the simulated depth with the current real depth | |
| 2628 char_depth_sim = char_depth_start = char_depth_real; | |
| 2629 | |
| 2630 // cache the gas/dil to start calculations with | |
| 2631 start_gas_num = char_I_current_gas_num; | |
| 2632 | |
| 623 | 2633 |
| 2634 // Lookup the gas that is currently breathed with the real tissues and set it as | |
| 2635 // the gas to be used with the simulated tissues, too. This gas will be used until | |
| 628 | 2636 // gas_find_best()/gas_take_best() is invoked and switches to a better gas. |
| 2637 gas_take_current(); | |
| 2638 | |
| 2639 // Setup the calculation ratio's for N2, He and O2 (sim_N2/He/_O2_ratio). | |
| 2640 // These ratios can be kept until a gas switch is done. Thus, if a call to | |
| 2641 // gas_find_best() has found a better gas and this gas is taken by a call | |
| 2642 // to gas_take_best(), gas_set_ratios() needs to be called again. | |
| 623 | 2643 gas_set_ratios(); |
| 2644 | |
| 2645 // compute ppO2, ppN2 and ppHe for current depth from sim_pres_respiration | |
| 2646 calc_alveolar_pressures(); | |
| 2647 | |
| 2648 // initialize the no decompression limit (NDL) time to 240 minutes | |
| 2649 NDL_time = 240; | |
| 2650 | |
| 631 | 2651 // clear the Total Time to Surface (TTS) and the Total Stops Time (TST) |
| 2652 TTS_time = 0; | |
| 2653 TST_time = 0; | |
| 628 | 2654 |
| 623 | 2655 // retrieve the tissue that had the shortest NDL time during last calculation |
| 2656 NDL_tissue_start = ( deco_status & CALC_NORM ) ? NDL_tissue_start_norm : NDL_tissue_start_alt; | |
| 2657 | |
| 2658 // start calculating NDL time with the tissue that had the shortest NDL last time | |
| 2659 NDL_tissue = NDL_tissue_start; | |
| 2660 NDL_tissue_lead = NDL_tissue_start; | |
| 2661 | |
| 631 | 2662 // tag gas needs as not calculated in fTTS mode by default |
| 2663 deco_info &= ~GAS_NEEDS_fTTS; | |
| 623 | 2664 |
| 628 | 2665 // shall calculate gas needs? |
| 2666 if( main_status & CALC_VOLUME ) | |
| 2667 { | |
| 2668 // set the usage rate (SAC rate), starting with working part of the dive | |
| 2669 gas_needs_usage_rate = char_I_SAC_work; | |
| 2670 | |
| 2671 // clear the gas volume needs for gases 1-5 | |
| 2672 for( i = 0; i < NUM_GAS; ++i ) gas_volume_need[i] = 0.0; | |
| 2673 | |
| 2674 #ifdef _rx_functions | |
| 2675 // only for OSTC TR model with TR functions enabled | |
| 2676 if( main_status & TR_FUNCTIONS ) | |
| 2677 { | |
| 2678 // invalidate pressure needs to pressure readings | |
| 2679 int_O_pressure_need[0] = 0 + INT_FLAG_NOT_AVAIL; | |
| 2680 int_O_pressure_need[1] = 0 + INT_FLAG_NOT_AVAIL; | |
| 2681 } | |
| 2682 #endif | |
| 2683 } | |
| 623 | 2684 |
| 631 | 2685 |
| 2686 #ifdef _cave_mode | |
| 2687 if( main_status & CAVE_MODE ) | |
| 2688 { | |
| 2689 // get the position of the first data set to start the backtracking from | |
| 2690 backtrack_index = char_I_backtrack_index; | |
| 2691 | |
| 2692 // get the first backtracking data set | |
| 2693 read_backtrack_data(); | |
| 2694 } | |
| 2695 #endif | |
| 2696 | |
| 2697 | |
| 623 | 2698 #ifdef _profiling |
| 2699 profiling_runs = 0; | |
| 2700 #endif | |
| 2701 | |
| 2702 // The next calculation phase will | |
| 628 | 2703 // - calculate the extended bottom segment if extended bottom time is configured (fTTS), |
| 2704 // - calculate the bottom segment gas need if gas needs calculation is configured, | |
| 623 | 2705 // - proceed with calculating the NDL time else. |
| 628 | 2706 if ( deco_status & DELAYED_ASCENT ) next_planning_phase = PHASE_30_EXTENDED_BOTTOM_TIME; |
| 2707 else if ( main_status & CALC_VOLUME ) next_planning_phase = PHASE_40_BOTTOM_GAS_NEED; | |
| 2708 else next_planning_phase = PHASE_50_NDL_TIME; | |
| 623 | 2709 |
| 2710 break; | |
| 2711 | |
| 2712 | |
| 2713 // | |
| 2714 //---- extended Bottom Time --------------------------------------------------------------- | |
| 2715 // | |
| 628 | 2716 case PHASE_30_EXTENDED_BOTTOM_TIME: |
| 623 | 2717 |
| 631 | 2718 // tag gas needs as calculated in fTTS mode |
| 2719 deco_info |= GAS_NEEDS_fTTS; | |
| 2720 | |
| 623 | 2721 // program interval on simulated tissues (flag bit 7 = 0) |
| 2722 tissue_increment = char_I_extra_time; | |
| 2723 | |
| 628 | 2724 // update the simulated tissues for tissue_increment (char_I_extra_time) minutes at depth, |
| 2725 // calc_alveolar_pressures() has already been called in cyclic initialization | |
| 623 | 2726 calc_tissues(); |
| 2727 | |
| 628 | 2728 // update the CNS value for tissue_increment (char_I_extra_time) minutes at depth |
| 623 | 2729 calc_CNS(); |
| 2730 | |
| 628 | 2731 // the next calculation phase will |
| 2732 // - calculate the extended bottom segment gas needs if gas needs calculation is configured, | |
| 2733 // - proceed with calculating the NDL time else. | |
| 2734 if ( main_status & CALC_VOLUME ) next_planning_phase = PHASE_40_BOTTOM_GAS_NEED; | |
| 2735 else next_planning_phase = PHASE_50_NDL_TIME; | |
| 2736 | |
| 2737 break; | |
| 2738 | |
| 2739 | |
| 2740 // | |
| 2741 //---- Bottom Segment Gas Need ------------------------------------------------------------ | |
| 2742 // | |
| 2743 case PHASE_40_BOTTOM_GAS_NEED: | |
| 2744 | |
| 2745 // on gas 1-5 ? | |
| 2746 if( sim_gas_current_num ) | |
| 2747 { | |
| 631 | 2748 // YES - take either the whole bottom time or just the fTTS/bailout extra time |
| 628 | 2749 gas_needs_time = ( main_status & CALCULATE_BOTTOM ) ? char_I_bottom_time : char_I_extra_time; |
| 2750 | |
| 631 | 2751 // any time to do? |
| 2752 if( gas_needs_time ) | |
| 2753 { | |
| 2754 // YES - set the bottom depth | |
| 2755 gas_needs_depth = char_depth_start; | |
| 2756 | |
| 2757 // calculate required gas volume | |
| 2758 calc_required_volume(); | |
| 2759 | |
| 2760 // take the result | |
| 2761 gas_volume_need[sim_gas_current_num-1] = gas_needs_volume_due; | |
| 2762 } | |
| 628 | 2763 } |
| 2764 | |
| 2765 | |
| 623 | 2766 // the next calculation phase will calculate the NDL time |
| 628 | 2767 next_planning_phase = PHASE_50_NDL_TIME; |
| 604 | 2768 |
| 582 | 2769 break; |
| 2770 | |
| 623 | 2771 |
| 2772 // | |
| 2773 //---- NDL Time --------------------------------------------------------------------------- | |
| 2774 // | |
| 628 | 2775 case PHASE_50_NDL_TIME: |
| 623 | 2776 |
| 2777 // Calculate the remaining no decompression limit (NDL) time for the tissue NDL_tissue. | |
| 2778 // NDL_time will be updated if the NDL time found is shorter than the current NDL_time. | |
| 2779 // | |
| 2780 // In the initialization phase of the calculation cycle: | |
| 2781 // - NDL_time had been initialized to 240 (minutes), | |
| 2782 // - NDL_tissue had been initialized to the tissue with | |
| 2783 // the shortest NDL time in the last cycle. | |
| 2784 // | |
| 2785 calc_NDL_time_tissue(); | |
| 2786 | |
| 2787 // advance to next tissue, wrapping around after last tissue | |
| 2788 NDL_tissue = (NDL_tissue + 1) & (NUM_COMP - 1); | |
| 2789 | |
| 2790 // did we run out of NDL time or did we have probed all tissues? | |
| 2791 if( (NDL_time == 0) || (NDL_tissue == NDL_tissue_start) ) | |
| 2792 { | |
| 2793 // YES | |
| 2794 | |
| 2795 // set the tissue with the shortest NDL time found as | |
| 2796 // the one to start with in the next calculation cycle | |
| 2797 if( deco_status & CALC_NORM ) NDL_tissue_start_norm = NDL_tissue_lead; | |
| 2798 else NDL_tissue_start_alt = NDL_tissue_lead; | |
| 2799 | |
| 631 | 2800 // done with calculating NDL time, next phase will calculate the ascent / cave return |
| 2801 next_planning_phase = PHASE_70_ASCENT_OR_RETURN; | |
| 623 | 2802 } |
| 2803 | |
| 2804 break; | |
| 2805 | |
| 2806 | |
| 560 | 2807 // |
| 631 | 2808 //---- Ascent or Return (cave mode) ------------------------------------------------------- |
| 560 | 2809 // |
| 631 | 2810 case PHASE_70_ASCENT_OR_RETURN: |
| 2811 | |
| 560 | 2812 { |
| 631 | 2813 overlay unsigned char doing_deco_stop = 0; |
| 2814 overlay unsigned char doing_gas_change = 0; | |
| 2815 | |
| 2816 | |
| 2817 // target simulated tissues, default is 1 minute interval | |
| 2818 tissue_increment = 1; | |
| 2819 | |
| 2820 // check if a deco stop is required: | |
| 2821 // - stays at the current depth if a stop is required, | |
| 2822 // - ascents to the next stop if possible, else | |
| 2823 // - ascents by 1 meter | |
| 2824 if( find_next_stop() ) | |
| 2825 { | |
| 2826 //---- stop required -------------------- | |
| 2827 | |
| 2828 // memorize doing a deco stop | |
| 2829 doing_deco_stop = 1; | |
| 2830 | |
| 2831 // set flag for deco stops found | |
| 2832 if( deco_status & CALC_NORM ) deco_info |= DECO_STOPS_NORM; | |
| 2833 else deco_info |= DECO_STOPS_ALT; | |
| 2834 | |
| 2835 // encountered a deco stop, so switch to deco usage rate (SAC deco) | |
| 2836 gas_needs_usage_rate = char_I_SAC_deco; | |
| 2837 | |
| 2838 // check if there is a better gas to switch to | |
| 2839 if( gas_find_best() ) | |
| 2840 { | |
| 2841 // YES - memorize doing a gas change | |
| 2842 doing_gas_change = 1; | |
| 2843 | |
| 2844 // take the gas | |
| 2845 gas_take_best(); | |
| 2846 | |
| 2847 // set the new calculation ratios for N2, He and O2 | |
| 2848 gas_set_ratios(); | |
| 2849 | |
| 2850 // add the gas change time to the stop time | |
| 2851 tissue_increment += char_I_gas_change_time; | |
| 2852 } | |
| 2853 | |
| 2854 // add the stop to an existing stop or add a new stop | |
| 2855 update_deco_table(tissue_increment); | |
| 2856 } | |
| 2857 else | |
| 623 | 2858 { |
| 631 | 2859 //---- no stop required ----------------- |
| 2860 | |
| 2861 // switch to 1/10 minute interval | |
| 2862 tissue_increment = 0; | |
| 2863 | |
| 2864 // memorize not doing a deco stop | |
| 2865 doing_deco_stop = 0; | |
| 2866 | |
| 2867 // check if there is a better gas to switch to, but only: | |
| 2868 // | |
| 2869 // if extended stops are activated OR if cave mode is enabled OR if in bailout | |
| 2870 // AND if the actual depth (char_depth_start) is deeper or at the change | |
| 2871 // depth of the better gas (change depth has not been passed yet) *) | |
| 2872 // AND if the depth of the last stop is above (shallower) or at the change | |
| 2873 // depth of the better gas (do not switch on final ascent) *) | |
| 2874 // | |
| 2875 // *) skipped when calculating in cave mode | |
| 2876 // | |
| 2877 // Attention: do not use a && formula over all 'if' terms, the | |
| 2878 // conditions need to be evaluated in the given order! | |
| 2879 // | |
| 2880 if( ( main_status & EXTENDED_STOPS ) | |
| 2881 || ( main_status & CAVE_MODE ) | |
| 2882 || ( deco_status & BAILOUT_MODE ) | |
| 2883 ) | |
| 2884 if( gas_find_best() ) | |
| 2885 #ifdef _cave_mode | |
| 2886 if( ( char_depth_start >= sim_gas_best_depth ) || ( main_status & CAVE_MODE ) ) | |
| 2887 if( ( char_I_last_stop_depth <= sim_gas_best_depth ) || ( main_status & CAVE_MODE ) ) | |
| 2888 #else | |
| 2889 if( ( char_depth_start >= sim_gas_best_depth ) ) | |
| 2890 if( ( char_I_last_stop_depth <= sim_gas_best_depth ) ) | |
| 2891 #endif | |
| 623 | 2892 { |
| 631 | 2893 // YES - memorize doing a gas change |
| 2894 doing_gas_change = 1; | |
| 2895 | |
| 2896 // take the gas | |
| 2897 gas_take_best(); | |
| 2898 | |
| 2899 // set the new calculation values for N2, He and O2 | |
| 2900 gas_set_ratios(); | |
| 2901 | |
| 2902 // create a stop lasting the gas change time | |
| 628 | 2903 tissue_increment = char_I_gas_change_time; |
| 2904 | |
| 631 | 2905 // if in deco and run from the deco calculator: |
| 2906 // create a stop for the gas change in the stops table | |
| 2907 if( !NDL_time && (deco_status & DECO_CALCULATOR_MODE) ) | |
| 2908 update_deco_table(tissue_increment); | |
| 2909 } | |
| 2910 | |
| 2911 } // stop / no stop | |
| 2912 | |
| 2913 | |
| 2914 #ifdef _cave_mode | |
| 2915 // cave mode actions | |
| 2916 if( main_status & CAVE_MODE ) | |
| 2917 { | |
| 2918 // doing a deco stop? | |
| 2919 if( doing_deco_stop ) | |
| 2920 { | |
| 2921 // YES - not moving, reset the 1/10 minute steps counter | |
| 2922 backtrack_step_counter = 10; | |
| 623 | 2923 } |
| 631 | 2924 else |
| 2925 { | |
| 2926 // NO - on the move, switch back to SAC work | |
| 2927 gas_needs_usage_rate = char_I_SAC_work; | |
| 2928 | |
| 2929 // - decrement the 1/10 minute steps counter if not already zero | |
| 2930 if( backtrack_step_counter ) backtrack_step_counter--; | |
| 2931 | |
| 2932 // - target backtracking depth reached? | |
| 2933 if( char_depth_sim == backtrack_target_depth ) | |
| 2934 { | |
| 2935 // YES - on target depth | |
| 2936 | |
| 2937 // target depth reached within first 1/10 minute? | |
| 2938 if( backtrack_step_counter == 9 ) | |
| 2939 { | |
| 2940 // YES - will not change depth any more while remaining 9/10 of | |
| 2941 // the minute, so can do the full full minute in one step | |
| 2942 tissue_increment = 1; | |
| 2943 backtrack_step_counter = 0; | |
| 2944 } | |
| 2945 | |
| 2946 // on the move for a minute or more now? | |
| 2947 // (incl. doing full minute in one step) | |
| 2948 if( backtrack_step_counter == 0 ) | |
| 2949 { | |
| 2950 // YES - get the data of the next backtracking data set | |
| 2951 read_backtrack_data(); | |
| 2952 } | |
| 2953 } | |
| 2954 } | |
| 2955 } // cave mode | |
| 2956 #endif | |
| 628 | 2957 |
| 2958 // shall calculate gas needs? | |
| 2959 if( main_status & CALC_VOLUME ) | |
| 2960 { | |
| 650 | 2961 overlay unsigned char index_last_gas = sim_gas_last_num - 1; |
| 2962 overlay unsigned char index_curr_gas = sim_gas_current_num - 1; | |
| 631 | 2963 |
| 2964 #ifdef _cave_mode | |
| 2965 // in cave mode? | |
| 2966 if( main_status & CAVE_MODE ) | |
| 2967 { | |
| 2968 // YES - set the depth for the gas needs calculation to the | |
| 2969 // simulated stop / on-the-move depth | |
| 2970 gas_needs_depth = char_depth_sim; | |
| 2971 } | |
| 2972 else | |
| 2973 #endif | |
| 2974 { | |
| 2975 // NO - set the depth for the gas needs calculation to the shallower | |
| 2976 // one of the actual depth (char_depth_start, current real depth) | |
| 2977 // and the simulated (stop) depth, as we may on purpose dive | |
| 2978 // shallower than we should to conserve on a low running gas supply | |
| 2979 gas_needs_depth = ( char_depth_start < char_depth_sim ) ? | |
| 2980 char_depth_start : char_depth_sim; | |
| 2981 } | |
| 2982 | |
| 2983 // doing a gas change and a gas change time is set? | |
| 2984 if( doing_gas_change && char_I_gas_change_time ) | |
| 628 | 2985 { |
| 2986 // YES - set time it takes for switching the gas | |
| 2987 gas_needs_time = char_I_gas_change_time; | |
| 2988 | |
| 631 | 2989 // - calculate required gas volume for the gas change |
| 2990 calc_required_volume(); | |
| 2991 | |
| 2992 // - add gas change demand to overall demand on the last gas | |
| 2993 if( sim_gas_last_num ) gas_volume_need[index_last_gas] += gas_needs_volume_due; | |
| 2994 | |
| 2995 // - add gas change demand to overall demand on the current gas | |
| 2996 if( sim_gas_current_num ) gas_volume_need[index_curr_gas] += gas_needs_volume_due; | |
| 628 | 2997 } |
| 2998 | |
| 631 | 2999 // current gas is 1-5 ? (i.e. not 0 aka gas 6) |
| 628 | 3000 if( sim_gas_current_num ) |
| 3001 { | |
| 631 | 3002 // set time: doing a deco stop -> 1 minute, encoded by tissue_increment = 1 |
| 3003 // no deco stop -> 1/10 minute, encoded by tissue_increment = 0 | |
| 628 | 3004 gas_needs_time = tissue_increment; |
| 3005 | |
| 631 | 3006 // calculate required gas volume for the stop, ascent or travel |
| 3007 calc_required_volume(); | |
| 628 | 3008 |
| 3009 // add the demand to the overall demand on the current gas | |
| 631 | 3010 gas_volume_need[index_curr_gas] += gas_needs_volume_due; |
| 628 | 3011 } |
| 631 | 3012 |
| 3013 #ifdef _gas_contingency | |
| 3014 // in gas contingency mode? | |
| 3015 if( main_status & GAS_CONTINGENCY ) | |
| 628 | 3016 { |
| 631 | 3017 overlay unsigned char all_peer_tanks_used_up = 1; |
| 3018 | |
| 3019 | |
| 3020 // when doing a gas change and the there is an overdraw on the last gas, | |
| 3021 // then transfer the overdraw to the current gas if the current gas has | |
| 3022 // an equal or deeper change depth than the overdrawn gas | |
| 3023 if( doing_gas_change ) | |
| 3024 if( gas_volume_need[index_last_gas] >= gas_volume_avail[index_last_gas] ) | |
| 3025 if( char_I_deco_gas_change[index_last_gas] <= char_I_deco_gas_change[index_curr_gas] ) | |
| 3026 { | |
| 3027 overlay float overdraw; | |
| 3028 | |
| 3029 // calculate overdraw | |
| 3030 overdraw = gas_volume_need[index_last_gas] - gas_volume_avail[index_last_gas]; | |
| 3031 | |
| 3032 // transfer overdraw | |
| 3033 gas_volume_need[index_last_gas] -= overdraw; | |
| 3034 gas_volume_need[index_curr_gas] += overdraw; | |
| 3035 | |
| 3036 // tag last gas as fully used up | |
| 3037 deco_gas_type[index_last_gas] |= GAS_FULLY_USED_UP; | |
| 3038 } | |
| 3039 | |
| 3040 // if there are peer tanks with the current gas (i.e. other tanks that have the same | |
| 3041 // change depth), check if there is at least one tank that is not yet fully used up | |
| 3042 if( peer_tank[index_curr_gas] ) | |
| 628 | 3043 { |
| 631 | 3044 // scan all tanks |
| 3045 for( i = 0; i < NUM_GAS; i++ ) | |
| 3046 { | |
| 3047 // check if | |
| 3048 // - tank is a peer tank | |
| 3049 // - tank is currently neither staged nor lost | |
| 3050 // - tank is not fully used up yet | |
| 3051 if( (peer_tank[index_curr_gas] & (1 << i) ) ) | |
| 3052 if( !(deco_gas_type[i] & GAS_AVAIL_MASK ) ) | |
| 3053 if( !(deco_gas_type[i] & GAS_FULLY_USED_UP) ) | |
| 3054 { | |
| 3055 // found a peer tank that is available and not fully used up yet | |
| 3056 all_peer_tanks_used_up = 0; | |
| 3057 } | |
| 3058 } | |
| 3059 } | |
| 3060 | |
| 3061 // select which threshold is sensible to check for | |
| 3062 if ( deco_gas_type[index_curr_gas] & GAS_FULLY_USED_UP ) | |
| 3063 { | |
| 3064 // already found as fully used up, nothing to do any more | |
| 628 | 3065 } |
| 631 | 3066 else if( deco_gas_type[index_curr_gas] & GAS_NEARLY_USED_UP ) |
| 3067 { | |
| 3068 // check for fully used up threshold | |
| 3069 if( gas_volume_need[index_curr_gas] >= gas_volume_avail[index_curr_gas] ) | |
| 3070 { | |
| 3071 // tag the gas as fully used up | |
| 3072 deco_gas_type[index_curr_gas] |= GAS_FULLY_USED_UP; | |
| 3073 | |
| 3074 // set warning if all peer tanks are fully used up, too | |
| 3075 if( all_peer_tanks_used_up ) deco_gas_type[index_curr_gas] |= GAS_NEED_WARNING; | |
| 3076 } | |
| 3077 } | |
| 3078 else | |
| 3079 { | |
| 3080 // check for nearly used up threshold | |
| 3081 if( gas_volume_need[index_curr_gas] >= gas_volume_atten[index_curr_gas] ) | |
| 3082 { | |
| 3083 // tag the gas as nearly used up | |
| 3084 deco_gas_type[index_curr_gas] |= GAS_NEARLY_USED_UP; | |
| 3085 | |
| 3086 // set attention if all peer tanks are already fully used up | |
| 3087 if( all_peer_tanks_used_up ) deco_gas_type[index_curr_gas] |= GAS_NEED_ATTENTION; | |
| 3088 } | |
| 3089 } | |
| 3090 } | |
| 3091 #endif // _gas_contingency | |
| 3092 | |
| 3093 } // gas needs | |
| 3094 | |
| 3095 // update the total stops time | |
| 3096 if( doing_deco_stop ) | |
| 628 | 3097 { |
| 631 | 3098 // total stops time is counted in full minutes, add 1 minute |
| 3099 TST_time += 1; | |
| 3100 } | |
| 3101 | |
| 3102 // update the total ascent / cave return time | |
| 3103 if( tissue_increment ) | |
| 3104 { | |
| 3105 // total time to surface is counted in 1/10 minutes, add 1 minute | |
| 3106 TTS_time += 10 * tissue_increment; | |
| 3107 } | |
| 3108 else | |
| 3109 { | |
| 3110 // total time to surface is counted in 1/10 minutes, add 1/10 minute | |
| 3111 TTS_time += 1; | |
| 3112 } | |
| 3113 | |
| 650 | 3114 } |
| 631 | 3115 |
| 3116 // calculate absolute pressure at the current depth | |
| 3117 sim_pres_respiration = (float)char_depth_sim * METER_TO_BAR + pres_surface; | |
| 582 | 3118 |
| 604 | 3119 // compute current ppO2, ppN2 and ppHe |
| 582 | 3120 calc_alveolar_pressures(); |
| 3121 | |
| 560 | 3122 // update the tissues |
| 582 | 3123 calc_tissues(); |
| 604 | 3124 |
| 631 | 3125 // update the CNS |
| 604 | 3126 calc_CNS(); |
| 623 | 3127 |
| 631 | 3128 // finish stops calculation if the surface is reached or |
| 3129 // if the deco table is full / calculations took too long | |
| 3130 if( (char_depth_sim == 0) || (deco_warnings & DECO_WARNING_INCOMPLETE) ) | |
| 3131 next_planning_phase = PHASE_80_RESULTS; | |
| 623 | 3132 |
| 3133 break; | |
| 3134 | |
| 3135 | |
| 3136 /// | |
| 3137 //--- Results - Initialization ------------------------------------------------------------ | |
| 3138 // | |
| 628 | 3139 case PHASE_80_RESULTS: |
| 3140 | |
| 3141 // convert the CNS value to integer | |
| 3142 convert_sim_CNS_for_display(); | |
| 3143 | |
| 631 | 3144 // limit total time to surface to display max. and rescale to full minutes |
| 3145 if( TTS_time < 9995 ) TTS_time = (TTS_time + 5) / 10; | |
| 3146 else TTS_time = 999 | INT_FLAG_INVALID; | |
| 3147 | |
| 650 | 3148 // limit total stops time to display max. |
| 3149 if( TST_time > 999 ) TST_time = 999 | INT_FLAG_INVALID; | |
| 623 | 3150 |
| 631 | 3151 // normal or alternative plan? |
| 623 | 3152 if( deco_status & CALC_NORM ) |
| 3153 { | |
| 650 | 3154 // normal plan |
| 3155 | |
| 3156 // export the integer CNS value | |
| 3157 int_O_CNS_norm = int_sim_CNS_fraction; | |
| 3158 | |
| 3159 // publish the stops table to the display functions | |
| 3160 publish_deco_table(); | |
| 3161 | |
| 3162 // When in deco and the ceiling depth is > 0 but the deco calculation | |
| 3163 // reveals no distinct deco stop yet because the deco obligation will | |
| 3164 // vanish during the ascent, create an artificial stop to signal that | |
| 3165 // expedite surfacing ("popping up") is not allowed any more. | |
| 3166 if( char_O_deco_depth[0] == 0 ) // simulated ascent reveals no required stops | |
| 3167 if( int_O_ceiling > 0 ) // real tissues have a ceiling | |
| 3168 { | |
| 3169 // set a pro forma stop at the configured last stop depth | |
| 3170 char_O_deco_depth[0] = char_I_last_stop_depth; | |
| 3171 | |
| 3172 // set a stop time of 0 minutes, this will be displayed as "..'" | |
| 3173 char_O_deco_time[0] = 0; | |
| 3174 } | |
| 3175 | |
| 3176 // within NDL? | |
| 3177 if ( NDL_time ) | |
| 3178 { | |
| 3179 // YES - output the NDL and TTS time | |
| 3180 int_O_NDL_norm = NDL_time; | |
| 3181 int_O_TTS_norm = TTS_time; | |
| 3182 | |
| 3183 // clear the stops time | |
| 3184 int_O_TST_norm = 0; | |
| 3185 } | |
| 3186 else | |
| 3187 { | |
| 3188 // NO - clear the normal NDL time | |
| 3189 int_O_NDL_norm = 0; | |
| 3190 | |
| 3191 // export the TTS and total stops time | |
| 3192 int_O_TTS_norm = TTS_time; | |
| 3193 int_O_TST_norm = TST_time; | |
| 3194 } | |
| 623 | 3195 } |
| 3196 else | |
| 3197 { | |
| 650 | 3198 // alternative plan |
| 3199 | |
| 3200 // export the integer CNS value | |
| 3201 int_O_CNS_alt = int_sim_CNS_fraction; | |
| 3202 | |
| 3203 // within NDL? | |
| 3204 if ( NDL_time ) | |
| 3205 { | |
| 3206 // YES - output the NDL time | |
| 3207 int_O_NDL_alt = NDL_time; | |
| 3208 int_O_TTS_alt = TTS_time; | |
| 3209 | |
| 3210 // clear the alternative TTS and stops time | |
| 3211 int_O_TST_alt = 0 + INT_FLAG_ZERO; | |
| 3212 } | |
| 3213 else | |
| 3214 { | |
| 3215 // NO - clear the alternative NDL time | |
| 3216 int_O_NDL_alt = 0; | |
| 3217 | |
| 3218 // export the TTS and total stops time | |
| 3219 int_O_TTS_alt = TTS_time; | |
| 3220 int_O_TST_alt = TST_time; | |
| 3221 } | |
| 623 | 3222 } |
| 3223 | |
| 650 | 3224 // export deco infos and warnings |
| 3225 char_O_deco_info = deco_info; | |
| 3226 char_O_deco_warnings = deco_warnings; | |
| 3227 | |
| 623 | 3228 // The next calculation phase will |
| 631 | 3229 // - convert the gas needs from volume to pressure if gas needs calculation is configured |
| 3230 // - else finish the calculation cycle | |
| 650 | 3231 if ( main_status & CALC_VOLUME ) next_planning_phase = PHASE_81_GAS_NEEDS_PRESSURES; |
| 631 | 3232 else next_planning_phase = PHASE_90_FINISH; |
| 623 | 3233 |
| 3234 break; | |
| 3235 | |
| 3236 | |
| 3237 // | |
| 628 | 3238 //--- Results - convert Gas Needs Volumes to Pressures ------------------------------------ |
| 623 | 3239 // |
| 650 | 3240 case PHASE_81_GAS_NEEDS_PRESSURES: |
| 3241 | |
| 3242 // step through all gases | |
| 3243 for (i = 0; i < NUM_GAS; i++) | |
| 3244 { | |
| 3245 // convert required volume of the gas into the respective pressure and set the flags | |
| 3246 convert_volume_to_pressure(i); | |
| 3247 } | |
| 623 | 3248 |
| 631 | 3249 #ifdef _cave_mode |
| 650 | 3250 // tag gas needs as calculated in cave mode or in open water mode |
| 3251 if( main_status & CAVE_MODE ) deco_info |= GAS_NEEDS_CAVE; | |
| 3252 else deco_info &= ~GAS_NEEDS_CAVE; | |
| 3253 | |
| 3254 // export updated deco info | |
| 3255 char_O_deco_info = deco_info; | |
| 3256 #endif | |
| 631 | 3257 |
| 3258 // advance to next calculation phase | |
| 3259 next_planning_phase = PHASE_90_FINISH; | |
| 3260 | |
| 3261 break; | |
| 3262 | |
| 623 | 3263 // |
| 3264 //--- finish Calculation Cycle ------------------------------------------------------------ | |
| 3265 // | |
| 3266 case PHASE_90_FINISH: | |
| 3267 | |
| 3268 // Check if deco obligation is steady state or decreasing. | |
| 631 | 3269 // Update the result only: |
| 3270 // - if an alternative plan is enabled, and | |
| 3271 // - if a valid alternative plan TTS exists, and | |
| 3272 // - if it is not a bailout plan | |
| 3273 if( (deco_status & CALC_ALT ) ) | |
|
635
9a64914a8fca
3.10 re-release addressing some minor issues and language fixes
heinrichsweikamp
parents:
634
diff
changeset
|
3274 if( !(int_O_TTS_alt & INT_FLAG_INVALID) ) |
| 631 | 3275 if( !(deco_status & BAILOUT_MODE ) ) |
| 623 | 3276 { |
| 650 | 3277 if ( int_O_TTS_alt < int_O_TTS_norm ) deco_info |= DECO_ZONE; |
| 3278 else if( int_O_TTS_alt > int_O_TTS_norm ) deco_info &= ~DECO_ZONE; | |
| 3279 | |
| 3280 // export updated deco info | |
| 3281 char_O_deco_info = deco_info; | |
| 623 | 3282 } |
| 3283 | |
| 650 | 3284 // restore command flag to indicate that the deco calculation cycle has finished |
| 3285 char_O_deco_status = deco_status; | |
| 623 | 3286 |
| 3287 // signal end of deco calculation | |
| 3288 next_planning_phase = PHASE_00_DONE; | |
| 3289 | |
| 3290 break; | |
| 3291 | |
| 3292 } // switch | |
| 3293 | |
| 3294 // read timer 5, result will be stored in tmr5_value (in 1/32 ms) and tmr5_overflow | |
| 3295 read_tmr5(); | |
| 3296 | |
| 3297 } // sequence calculation phases while not timed out and calculation cycle is not finished | |
| 3298 while( (tmr5_overflow == 0) && ( next_planning_phase != PHASE_00_DONE ) ); | |
| 3299 | |
| 3300 // report where we are in terms of depth reached, used in deco calculator to show deco calculation progress | |
| 3301 char_O_depth_sim = char_depth_sim; | |
| 3302 | |
| 3303 | |
| 3304 #ifdef _profiling | |
| 3305 | |
| 3306 //---- Performance Measurement ------------------------------------------- | |
| 3307 | |
| 3308 // convert timer 5 readout into ms | |
| 3309 profiling_runtime = tmr5_value / 32; | |
| 3310 | |
| 3311 // actual runtime longer than target runtime? | |
| 3312 if( tmr5_overflow ) | |
| 3313 { | |
| 3314 // YES - report excess | |
| 3315 int_O_profiling_overrun = profiling_runtime; | |
| 3316 | |
| 3317 // - excess > max we had so far? | |
| 3318 if( int_O_profiling_overrun > int_O_profiling_overrun_max ) | |
| 3319 { | |
| 3320 // YES - update max | |
| 3321 int_O_profiling_overrun_max = int_O_profiling_overrun; | |
| 3322 | |
| 3323 // - store the causing phase | |
| 3324 char_O_profiling_overrun_phase = profiling_phase; | |
| 3325 } | |
| 560 | 3326 } |
| 623 | 3327 else |
| 3328 { | |
| 3329 // NO - calculate unused budget and flag it to be under-run time | |
| 3330 int_O_profiling_overrun = (2048 - profiling_runtime) | 0x8000; | |
| 3331 } | |
| 3332 | |
| 3333 // increment number of runs in current cycle | |
| 3334 profiling_runs += 1; | |
| 3335 | |
| 3336 // planning cycle completed? | |
| 3337 if( next_planning_phase == PHASE_00_DONE ) | |
| 3338 { | |
| 3339 // YES - export number of runs it took | |
| 3340 if( deco_status & COMPLETED_NORM ) char_O_profiling_runs_norm = profiling_runs; | |
| 3341 else char_O_profiling_runs_alt = profiling_runs; | |
| 3342 } | |
| 3343 | |
| 3344 #endif | |
| 3345 | |
| 3346 } | |
| 3347 | |
| 3348 | |
| 3349 ////////////////////////////////////////////////////////////////////////////// | |
| 3350 // calc_hauptroutine_data_input | |
| 3351 // | |
| 3352 // Set all C-code dive parameters from their ASM-code values. | |
| 3353 // | |
| 3354 void calc_hauptroutine_data_input(void) | |
| 3355 { | |
| 3356 overlay float IG_ratio; | |
| 3357 | |
| 3358 // safeguard and convert the surface pressure (mbar -> bar) (*) | |
| 3359 if( int_I_pres_surface < 500 ) pres_surface = 0.500; | |
| 3360 else pres_surface = 0.001 * int_I_pres_surface; | |
| 3361 | |
| 3362 // safeguard and convert the current real pressure | |
| 3363 if( int_I_pres_respiration < 500 ) real_pres_respiration = 0.500; | |
| 3364 else real_pres_respiration = 0.001 * int_I_pres_respiration; | |
| 3365 | |
| 3366 // safeguard further parameters to protect the tissue-flag and the stop table | |
| 3367 if( char_I_sim_advance_time > 127 ) char_I_sim_advance_time = 127; | |
| 3368 if( char_I_extra_time > 127 ) char_I_extra_time = 127; | |
| 3369 if( char_I_gas_change_time > 99 ) char_I_gas_change_time = 99; | |
| 3370 | |
| 628 | 3371 |
| 3372 // compute the depth in meters where we are now | |
| 3373 float_depth_real = (real_pres_respiration - pres_surface) * BAR_TO_METER; | |
| 3374 | |
| 3375 // convert to integer and round up to next full meter | |
| 3376 char_depth_real = (unsigned char)(float_depth_real + 0.99); | |
| 3377 | |
| 3378 | |
| 623 | 3379 // calculate partial pressure of N2 in respired air at surface pressure |
| 3380 calc_N2_equilibrium(); | |
| 3381 | |
| 3382 // get, safeguard and convert the saturation and desaturation factors | |
| 3383 get_saturation_factors(); | |
| 3384 | |
| 3385 #ifdef _ccr_pscr | |
| 3386 // compute a factor that will be used later on for pSCR ppO2 drop calculation (*) | |
| 3387 float_pSCR_factor = 0.01 * char_I_PSCR_drop * char_I_PSCR_lungratio; | |
| 3388 #endif | |
| 3389 | |
| 3390 #ifdef _helium | |
| 3391 // get the currently breathed gas ratios | |
| 3392 real_O2_ratio = 0.01 * char_I_O2_ratio; | |
| 3393 real_He_ratio = 0.01 * char_I_He_ratio; | |
| 3394 | |
| 3395 // calculate the inert gas ratio (local helper variable) | |
| 3396 IG_ratio = 1.00 - real_O2_ratio; | |
| 3397 | |
| 3398 // calculate the N2 ratio | |
| 3399 real_N2_ratio = IG_ratio - real_He_ratio; | |
| 3400 #else | |
| 3401 // get the currently breathed O2 ratio | |
| 3402 real_O2_ratio = 0.01 * char_I_O2_ratio; | |
| 3403 | |
| 3404 // set the He ratio to zero | |
| 3405 real_He_ratio = 0.0; | |
| 3406 | |
| 3407 // calculate the N2 / inert gas ratio | |
| 3408 real_N2_ratio = IG_ratio = 1.00 - real_O2_ratio; | |
| 3409 #endif // _helium | |
| 3410 | |
| 3411 #ifdef _ccr_pscr | |
| 3412 // calculate ppO2 drop in pSCR loop for real tissues | |
| 3413 real_pSCR_drop = IG_ratio * float_pSCR_factor; | |
| 3414 #endif | |
| 3415 | |
| 0 | 3416 } |
| 3417 | |
| 3418 | |
| 3419 ////////////////////////////////////////////////////////////////////////////// | |
| 582 | 3420 // calc_tissues |
| 0 | 3421 // |
| 623 | 3422 // INPUT: ppN2 partial pressure of inspired N2 |
| 3423 // ppHe partial pressure of inspired He | |
| 631 | 3424 // tissue_increment tissue selector (real or simulated) and interval time |
| 623 | 3425 // |
| 3426 // MODIFIED: real_pres_tissue_N2[] tissue N2 pressures (in real tissues context) | |
| 3427 // real_pres_tissue_He[] tissue He pressures (in real tissues context) | |
| 3428 // sim_pres_tissue_N2[] tissue N2 pressures (in simulated tissues context) | |
| 3429 // sim_pres_tissue_He[] tissue He pressures (in simulated tissues context) | |
| 3430 // | |
| 3431 // OUTPUT: char_O_tissue_pres_N2[] tissue N2 pressures scaled for display purpose (in real tissues context) | |
| 3432 // char_O_tissue_pres_He[] tissue He pressures scaled for display purpose (in real tissues context) | |
| 3433 // char_O_tissue_pressure[] combined tissue pressures scaled for display purpose (in real tissue context) | |
| 582 | 3434 // |
| 3435 static void calc_tissues() | |
| 0 | 3436 { |
| 623 | 3437 overlay unsigned char period; |
| 650 | 3438 overlay float last_press_tissue; |
| 3439 overlay float delta_press_N2; | |
| 623 | 3440 |
| 3441 #ifdef _helium | |
| 650 | 3442 overlay float delta_press_He; |
| 623 | 3443 #endif |
| 582 | 3444 |
| 3445 assert( 0.00 <= ppN2 && ppN2 < 11.2 ); // 80% N2 at 130m | |
| 3446 assert( 0.00 <= ppHe && ppHe < 12.6 ); // 90% He at 130m | |
| 3447 | |
| 3448 | |
| 604 | 3449 for( ci=0; ci < NUM_COMP; ci++ ) // iterate through all compartments |
| 582 | 3450 { |
| 631 | 3451 i = tissue_increment & TIME_MASK; // i > 0: do a number of i full minutes |
| 3452 // I = 0: do 2 (real tissues) or 6 (simulated tissues) seconds | |
| 3453 | |
| 3454 if( i == 0 ) // check if we shall do one 2 or 6 seconds interval | |
| 560 | 3455 { |
| 631 | 3456 read_Buhlmann_times(0); // YES - program coefficients for a 2 or 6 seconds period |
| 623 | 3457 period = 1; // - set period length (in cycles) |
| 3458 i = 1; // - and one cycle to do | |
| 560 | 3459 } |
| 582 | 3460 else if( i > 9 ) // check if we can start with 10 minutes periods |
| 560 | 3461 { |
| 623 | 3462 read_Buhlmann_times(2); // YES - program coefficients for 10 minutes periods |
| 3463 period = 10; // set period length (in cycles) to ten | |
| 560 | 3464 } |
| 623 | 3465 else // last but not lease, do 1 to 9 minutes |
| 560 | 3466 { |
| 623 | 3467 read_Buhlmann_times(1); // NO - program coefficients for 1 minute periods |
| 3468 period = 1; // - set period length (in cycles) to one | |
| 560 | 3469 } |
| 3470 | |
| 3471 do | |
| 3472 { | |
| 650 | 3473 if (tissue_increment & TISSUE_SELECTOR) |
| 560 | 3474 { |
| 650 | 3475 //---- real N2 -------------------------------------- |
| 3476 | |
| 3477 // get the real tissue pressure | |
| 3478 last_press_tissue = real_pres_tissue_N2[ci]; | |
| 3479 | |
| 3480 // calculate the pressure change | |
| 3481 temp_tissue = (ppN2 - last_press_tissue) * var_N2_e; | |
| 3482 | |
| 3483 // apply the saturation / desaturation factor on temp_tissue | |
| 3484 apply_saturation_factors(); | |
| 3485 | |
| 3486 // store the pressure change for IBCD check and tissue graphics | |
| 3487 delta_press_N2 = temp_tissue; | |
| 3488 | |
| 3489 // update the delta accumulator | |
| 3490 real_pres_delta_N2[ci] += temp_tissue; | |
| 3491 | |
| 3492 // update the real tissue pressure | |
| 3493 real_pres_tissue_N2[ci] += real_pres_delta_N2[ci]; | |
| 3494 | |
| 3495 // reduce the delta accumulator | |
| 3496 real_pres_delta_N2[ci] -= real_pres_tissue_N2[ci] - last_press_tissue; | |
| 3497 | |
| 3498 #ifdef _helium | |
| 3499 //---- real He -------------------------------------- | |
| 3500 | |
| 3501 // get the real tissue pressure | |
| 3502 last_press_tissue = real_pres_tissue_He[ci]; | |
| 3503 | |
| 3504 // calculate the pressure change | |
| 3505 temp_tissue = (ppHe - last_press_tissue) * var_He_e; | |
| 3506 | |
| 3507 // apply the saturation / desaturation factor on temp_tissue | |
| 3508 apply_saturation_factors(); | |
| 3509 | |
| 3510 // store the pressure change for IBCD check and tissue graphics | |
| 3511 delta_press_He = temp_tissue; | |
| 3512 | |
| 3513 // update the delta accumulator | |
| 3514 real_pres_delta_He[ci] += temp_tissue; | |
| 3515 | |
| 3516 // update the real tissue pressure | |
| 3517 real_pres_tissue_He[ci] += real_pres_delta_He[ci]; | |
| 3518 | |
| 3519 // reduce the delta accumulator | |
| 3520 real_pres_delta_He[ci] -= real_pres_tissue_He[ci] - last_press_tissue; | |
| 3521 #endif | |
| 560 | 3522 } |
| 3523 else | |
| 3524 { | |
| 650 | 3525 //---- simulated N2 --------------------------------- |
| 3526 | |
| 3527 // get the simulated tissue pressure | |
| 3528 last_press_tissue = sim_pres_tissue_N2[ci]; | |
| 3529 | |
| 3530 // calculate the pressure change | |
| 3531 temp_tissue = (ppN2 - last_press_tissue) * var_N2_e; | |
| 3532 | |
| 3533 // apply the saturation / desaturation factor on temp_tissue | |
| 3534 apply_saturation_factors(); | |
| 3535 | |
| 3536 // update the delta accumulator | |
| 3537 sim_pres_delta_N2[ci] += temp_tissue; | |
| 3538 | |
| 3539 // update the simulated tissue pressure | |
| 3540 sim_pres_tissue_N2[ci] += sim_pres_delta_N2[ci]; | |
| 3541 | |
| 3542 // reduce the delta accumulator | |
| 3543 sim_pres_delta_N2[ci] -= sim_pres_tissue_N2[ci] - last_press_tissue; | |
| 560 | 3544 |
| 623 | 3545 #ifdef _helium |
| 650 | 3546 //---- simulated He --------------------------------- |
| 3547 | |
| 3548 // get the simulated tissue pressure | |
| 3549 last_press_tissue = sim_pres_tissue_He[ci]; | |
| 3550 | |
| 3551 // calculate the pressure change | |
| 3552 temp_tissue = (ppHe - last_press_tissue) * var_He_e; | |
| 3553 | |
| 3554 // apply the saturation / desaturation factor on temp_tissue | |
| 3555 apply_saturation_factors(); | |
| 3556 | |
| 3557 // update the delta accumulator | |
| 3558 sim_pres_delta_He[ci] += temp_tissue; | |
| 3559 | |
| 3560 // update the simulated tissue pressure | |
| 3561 sim_pres_tissue_He[ci] += sim_pres_delta_He[ci]; | |
| 3562 | |
| 3563 // reduce the delta accumulator | |
| 3564 sim_pres_delta_He[ci] -= sim_pres_tissue_He[ci] - last_press_tissue; | |
| 3565 #endif | |
| 560 | 3566 } |
| 623 | 3567 |
| 3568 //---- decrement loop counter and adjust step size --------------- | |
| 560 | 3569 |
| 3570 // decrement loop counter | |
| 3571 i -= period; | |
| 582 | 3572 |
| 560 | 3573 // check if we need to switch from 10 minute periods to 1 minute periods |
| 3574 if( (i > 0) && (period = 10) && (i < 10) ) | |
| 3575 { | |
| 582 | 3576 read_Buhlmann_times(1); // program coefficients for 1 minute periods |
| 560 | 3577 period = 1; // set period length (in cycles) to one |
| 3578 } | |
| 3579 } | |
| 3580 while( i ); | |
| 582 | 3581 |
| 3582 | |
| 560 | 3583 // have the computations been done for the "real" tissues? |
| 623 | 3584 if( tissue_increment & TISSUE_SELECTOR ) |
| 560 | 3585 { |
| 623 | 3586 |
| 3587 #ifdef _helium | |
| 560 | 3588 // net tissue balance |
| 650 | 3589 temp_tissue = delta_press_N2 + delta_press_He; |
| 623 | 3590 |
| 560 | 3591 // check tissue on-/off-gassing and IBCD with applying a threshold of +/-HYST |
| 3592 // | |
| 584 | 3593 if ( temp_tissue < -HYST ) // check if the tissue is off-gassing |
| 560 | 3594 { |
| 623 | 3595 // tag tissue as not experiencing mentionable IBCD |
| 3596 IBCD_tissue_vector &= ~(1 << ci); | |
| 560 | 3597 } |
| 3598 else if ( temp_tissue > +HYST ) // check if the tissue in on-gassing | |
| 3599 { | |
| 623 | 3600 // check for counter diffusion |
| 650 | 3601 if( ((delta_press_N2 > 0.0) && (delta_press_He < 0.0)) |
| 3602 || ((delta_press_N2 < 0.0) && (delta_press_He > 0.0)) ) | |
| 560 | 3603 { |
| 623 | 3604 // tag tissue as experiencing mentionable IBCD |
| 3605 IBCD_tissue_vector |= (1 << ci); | |
| 560 | 3606 } |
| 3607 } | |
| 623 | 3608 #endif |
| 3609 | |
| 3610 // For N2 tissue pressure display purpose: | |
| 3611 | |
| 3612 // basically keep the on-gassing / off-gassing flag from last invocation, but flip | |
| 3613 // it in case the rate exceeds a set hysteresis (actual value: see #define of HYST) | |
| 3614 char_O_tissue_pres_N2[ci] &= 128; | |
| 650 | 3615 if ( delta_press_N2 > +HYST ) char_O_tissue_pres_N2[ci] = 128; // set flag for tissue pressure is increasing |
| 3616 else if ( delta_press_N2 < -HYST ) char_O_tissue_pres_N2[ci] = 0; // clear flag (-> tissue pressure is decreasing) | |
| 623 | 3617 |
| 3618 // scale N2 tissue pressure such that the surface steady-state tissue loading | |
| 3619 // of [0.7902 * (1013 hPa - ppWater)] bar will give a 8, which aligns with | |
| 3620 // the 2nd scale line. | |
| 650 | 3621 delta_press_N2 = (8 / (0.7902 * (1.013 - ppWater))) * real_pres_tissue_N2[ci]; |
| 623 | 3622 |
| 3623 // limit to 127 to protect the uppermost bit which holds the sat/desat flag | |
| 650 | 3624 if (delta_press_N2 > 127) delta_press_N2 = 127; |
| 623 | 3625 |
| 3626 // convert to integer and combine with sat/desat flag | |
| 650 | 3627 char_O_tissue_pres_N2[ci] += (unsigned char)delta_press_N2; |
| 623 | 3628 |
| 3629 #ifdef _helium | |
| 3630 | |
| 3631 // For He tissue pressure display purpose: | |
| 3632 | |
| 3633 // basically keep the on-gassing / off-gassing flag from last invocation, but flip | |
| 3634 // it in case the rate exceeds a set hysteresis (actual value: see #define of HYST) | |
| 3635 char_O_tissue_pres_He[ci] &= 128; | |
| 650 | 3636 if ( delta_press_He > +HYST ) char_O_tissue_pres_He[ci] = 128; // set flag for tissue pressure is increasing |
| 3637 else if ( delta_press_He < -HYST ) char_O_tissue_pres_He[ci] = 0; // clear flag (-> tissue pressure is decreasing) | |
| 623 | 3638 |
| 3639 // scale He tissue pressure alike it is done for N2. | |
| 3640 // With no He in a tissue, the result will be 0. | |
| 650 | 3641 delta_press_He = (8 / (0.7902 * (1.013 - ppWater))) * real_pres_tissue_He[ci]; |
| 623 | 3642 |
| 3643 // limit to 127 to protect the uppermost bit which holds the sat/desat flag | |
| 650 | 3644 if (delta_press_He > 127) delta_press_He = 127; |
| 623 | 3645 |
| 3646 // convert to integer and combine with sat/desat flag | |
| 650 | 3647 char_O_tissue_pres_He[ci] += (unsigned char)delta_press_He; |
| 623 | 3648 |
| 3649 // For combined tissue pressure display purpose: | |
| 3650 | |
| 3651 // basically keep the on-gassing / off-gassing flag from last invocation, but flip | |
| 3652 // it in case the rate exceeds a set hysteresis (actual value: see #define of HYST) | |
| 3653 char_O_tissue_pressure[ci] &= 128; | |
| 3654 if ( temp_tissue > +HYST ) char_O_tissue_pressure[ci] = 128; // set flag for tissue pressure is increasing | |
| 3655 else if ( temp_tissue < -HYST ) char_O_tissue_pressure[ci] = 0; // clear flag (-> tissue pressure is decreasing) | |
| 3656 | |
| 3657 // add the two scaled pressures. | |
| 650 | 3658 temp_tissue = delta_press_N2 + delta_press_He; |
| 623 | 3659 |
| 3660 // limit to 127 to protect the uppermost bit which holds the sat/desat flag | |
| 560 | 3661 if (temp_tissue > 127) temp_tissue = 127; |
| 3662 | |
| 623 | 3663 // convert to integer and combine with sat/desat flag |
| 3664 char_O_tissue_pressure[ci] += (unsigned char)temp_tissue; | |
| 3665 | |
| 3666 #else | |
| 3667 | |
| 3668 // He tissue pressure is zero | |
| 3669 char_O_tissue_pres_He[ci] = 0; | |
| 3670 | |
| 3671 // combined tissue pressure equals N2 tissue pressure | |
| 3672 char_O_tissue_pressure[ci] = char_O_tissue_pres_N2[ci]; | |
| 3673 | |
| 3674 #endif | |
| 3675 | |
| 582 | 3676 } //if |
| 3677 | |
| 3678 } // for | |
| 0 | 3679 } |
| 3680 | |
| 623 | 3681 |
| 0 | 3682 ////////////////////////////////////////////////////////////////////////////// |
| 3683 // calc_limit | |
| 3684 // | |
| 623 | 3685 // Input: GF_parameter gradient factor to be used, negative values activate surface mode |
| 3686 // tissue_increment selector for context: real or simulated tissues | |
| 3687 // sim_pres_tissue_N2/_He tissue pressures (used in simulated tissues context) | |
| 3688 // real_pres_tissue_N2/_He tissue pressures (used in real tissues context) | |
| 3689 // | |
| 3690 // Output: lead_supersat highest supersaturation found among all tissues, 1.0 = 100% | |
| 3691 // lead_tissue number of the leading tissue (0-15) | |
| 3692 // ceiling ceiling in bar relative pressure | |
| 3693 // | |
| 3694 // Modified: deco_warnings for IBCD, micro bubbles and outside warning (only in real tissues context) | |
| 582 | 3695 // |
| 3696 static void calc_limit(PARAMETER float GF_parameter) | |
| 0 | 3697 { |
| 631 | 3698 overlay float pres_ambient_min_overall = 0.0; |
| 3699 overlay unsigned char surface_mode = 0; // 0: off, 1: on | |
| 623 | 3700 |
| 3701 | |
| 3702 // check mode | |
| 3703 if( GF_parameter < 0 ) | |
| 3704 { | |
| 3705 // activate surface mode | |
| 3706 surface_mode = 1; | |
| 3707 | |
| 3708 // normalize parameter | |
| 3709 GF_parameter = -GF_parameter; | |
| 3710 } | |
| 3711 | |
| 3712 // set leading tissue number to tissue 1 (it has the index 0) | |
| 3713 lead_tissue = 0; | |
| 604 | 3714 |
| 3715 // initialize leading tissue supersaturation value to null | |
| 623 | 3716 lead_supersat = 0.0; |
| 3717 | |
| 3718 // next code section is relevant only when invoked on the real tissues | |
| 3719 if( tissue_increment & TISSUE_SELECTOR ) | |
| 582 | 3720 { |
| 623 | 3721 // clear IBCD, micro-bubbles and outside warning flags (locked warnings will be preserved) |
| 3722 deco_warnings &= ~( DECO_WARNING_IBCD + DECO_WARNING_MBUBBLES + DECO_WARNING_OUTSIDE + DECO_ATTENTION_OUTSIDE ); | |
| 582 | 3723 } |
| 3724 | |
| 3725 // loop over all tissues | |
| 604 | 3726 for( ci = 0; ci < NUM_COMP; ci++ ) |
| 582 | 3727 { |
| 631 | 3728 overlay float pres_ambient_min_tissue; |
| 623 | 3729 |
| 3730 | |
| 3731 // get the coefficients for tissue ci | |
| 3732 read_Buhlmann_coefficients(); | |
| 3733 | |
| 3734 #ifdef _helium | |
| 582 | 3735 |
| 3736 // get the tissue pressures | |
| 623 | 3737 // adopt_Buhlmann_coefficients needs calc_pres_tissue_N2/He when compiled for helium |
| 3738 if( tissue_increment & TISSUE_SELECTOR ) | |
| 560 | 3739 { |
| 582 | 3740 // context is real tissues |
| 623 | 3741 calc_pres_tissue_N2 = real_pres_tissue_N2[ci]; |
| 3742 calc_pres_tissue_He = real_pres_tissue_He[ci]; | |
| 560 | 3743 } |
| 3744 else | |
| 3745 { | |
| 582 | 3746 // context is simulated tissues |
| 3747 calc_pres_tissue_N2 = sim_pres_tissue_N2[ci]; | |
| 3748 calc_pres_tissue_He = sim_pres_tissue_He[ci]; | |
| 3749 } | |
| 3750 | |
| 3751 // overall tissue pressure | |
| 650 | 3752 calc_pres_tissue = calc_pres_tissue_N2 + calc_pres_tissue_He; |
| 582 | 3753 |
| 623 | 3754 #else |
| 3755 | |
| 3756 // get the tissue pressure | |
| 650 | 3757 calc_pres_tissue = ( tissue_increment & TISSUE_SELECTOR ) ? real_pres_tissue_N2[ci] : sim_pres_tissue_N2[ci]; |
| 623 | 3758 |
| 3759 #endif | |
| 582 | 3760 |
| 604 | 3761 // adopt a and b coefficients to current N2/He ratio inside the tissue |
| 3762 adopt_Buhlmann_coefficients(); | |
| 582 | 3763 |
| 3764 // next calculations are only relevant when invoked on the real tissues | |
| 623 | 3765 if( tissue_increment & TISSUE_SELECTOR ) |
| 582 | 3766 { |
| 618 | 3767 overlay float pres_tissue_max; |
| 582 | 3768 overlay float supersat; |
| 608 | 3769 overlay float baseline_threshold; |
| 604 | 3770 |
| 623 | 3771 |
| 582 | 3772 // check if tissue is in supersaturation |
| 650 | 3773 if( calc_pres_tissue > real_pres_respiration ) |
| 582 | 3774 { |
| 618 | 3775 // calculate maximum allowed tissue pressure at current ambient pressure |
| 623 | 3776 pres_tissue_max = real_pres_respiration / var_b + var_a; |
| 618 | 3777 |
| 3778 // calculate current supersaturation value (1.0 = 100%) of this tissue according to straight Buhlmann | |
| 650 | 3779 supersat = ( calc_pres_tissue - real_pres_respiration ) |
| 3780 / ( pres_tissue_max - real_pres_respiration ); | |
| 618 | 3781 |
| 623 | 3782 // calculate supersaturation value for display purpose: 1.35 = 135% = 86 pixel |
| 3783 if( supersat <= 1.35 ) char_O_tissue_saturation[ci] = (unsigned char)(supersat * 64); | |
| 3784 else char_O_tissue_saturation[ci] = 86; | |
| 3785 | |
| 582 | 3786 // memorize highest supersaturation found |
| 3787 if( supersat > lead_supersat ) lead_supersat = supersat; | |
| 3788 | |
| 608 | 3789 // tissue-dependent baseline threshold for micro bubbles and outside warnings |
| 3790 baseline_threshold = 0.02 * ci + 1.0; | |
| 3791 | |
| 3792 // micro bubbles warning: supersaturation > baseline threshold | |
| 3793 if( supersat > baseline_threshold ) | |
| 623 | 3794 deco_warnings |= (DECO_WARNING_MBUBBLES + DECO_WARNING_MBUBBLES_lock); |
| 604 | 3795 |
| 608 | 3796 // outside warning: supersaturation > baseline threshold + additional 5% margin |
| 623 | 3797 if( supersat > (baseline_threshold + 0.05) ) |
| 3798 deco_warnings |= (DECO_WARNING_OUTSIDE + DECO_WARNING_OUTSIDE_lock ); | |
| 3799 } | |
| 3800 else | |
| 3801 { | |
| 3802 // supersaturation is defined as zero while tissue pressure <= ambient pressure | |
| 3803 supersat = 0.0; | |
| 3804 char_O_tissue_saturation[ci] = 0; | |
| 560 | 3805 } |
| 623 | 3806 |
| 3807 // next only when in surface mode | |
| 3808 if( surface_mode ) | |
| 3809 { | |
| 3810 // tag tissue whether it is beyond the M-line limit or not | |
| 3811 if( supersat > 1.0 ) | |
| 3812 { | |
| 3813 char_O_tissue_pres_N2[ci] |= 128; | |
| 3814 #ifdef _helium | |
| 3815 char_O_tissue_pres_He[ci] |= 128; | |
| 3816 #endif | |
| 3817 char_O_tissue_pressure[ci] |= 128; | |
| 3818 } | |
| 3819 else | |
| 3820 { | |
| 3821 char_O_tissue_pres_N2[ci] &= ~128; | |
| 3822 #ifdef _helium | |
| 3823 char_O_tissue_pres_He[ci] &= ~128; | |
| 3824 #endif | |
| 3825 char_O_tissue_pressure[ci] &= ~128; | |
| 3826 } | |
| 3827 } | |
| 3828 } // real tissues | |
| 582 | 3829 |
| 618 | 3830 // calculate the minimum ambient pressure that the tissue can withstand |
| 631 | 3831 if( char_I_model == 0 ) |
| 618 | 3832 { |
| 3833 // straight Buhlmann | |
| 650 | 3834 pres_ambient_min_tissue = (calc_pres_tissue - var_a) * var_b; |
| 618 | 3835 } |
| 3836 else | |
| 3837 { | |
| 3838 // Buhlmann with Eric Baker's varying gradient factor correction | |
| 3839 // note: this equation [1] is the inverse of equation [2] | |
| 650 | 3840 pres_ambient_min_tissue = ( calc_pres_tissue - (var_a * GF_parameter) ) |
| 631 | 3841 / ( 1.0 - GF_parameter + (GF_parameter / var_b ) ); |
| 618 | 3842 } |
| 560 | 3843 |
| 3844 // check if this tissue requires a higher ambient pressure than was found to be needed up to now | |
| 631 | 3845 if( pres_ambient_min_tissue > pres_ambient_min_overall ) |
| 582 | 3846 { |
| 631 | 3847 pres_ambient_min_overall = pres_ambient_min_tissue; |
| 3848 lead_tissue = ci; | |
| 582 | 3849 } |
| 3850 } // for | |
| 3851 | |
| 631 | 3852 // compute ceiling in bar relative pressure |
| 3853 ceiling = pres_ambient_min_overall - pres_surface; | |
| 3854 | |
| 3855 // limit ceiling to positive values | |
| 3856 if( ceiling < 0.0 ) ceiling = 0.0; | |
| 623 | 3857 |
| 3858 #ifdef _helium | |
| 3859 // IBCD is checked for real tissues only | |
| 3860 if( tissue_increment & TISSUE_SELECTOR ) | |
| 560 | 3861 { |
| 604 | 3862 // check if the leading tissue is in IBCD condition |
| 623 | 3863 if( (IBCD_tissue_vector & (1 << lead_tissue)) |
| 3864 && ((real_pres_tissue_N2[lead_tissue] + real_pres_tissue_He[lead_tissue]) > real_pres_respiration) ) | |
| 582 | 3865 { |
| 623 | 3866 // leading tissue is in IBCD condition and in super-saturation, so issue a warning. |
| 3867 deco_warnings |= (DECO_WARNING_IBCD + DECO_WARNING_IBCD_lock); | |
| 582 | 3868 } |
| 560 | 3869 } |
| 623 | 3870 #endif |
| 3871 | |
| 0 | 3872 } |
| 623 | 3873 |
| 3874 | |
| 0 | 3875 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 3876 // calc_NDL_time_tissue |
| 3877 // | |
| 3878 // calculation of the remaining no decompression limit (NDL) time for a tissue | |
| 0 | 3879 // |
| 604 | 3880 // NOTE: Erik Baker's closed formula works for Nitrox. Trimix adds a second |
| 0 | 3881 // exponential term to the M-value equation, making it impossible to |
| 623 | 3882 // invert. So we have to solve the problem with a search approach. |
| 3883 // | |
| 3884 // Input: NDL_tissue tissue for which to calculate remaining NDL time | |
| 3885 // GF_high gradient factor used when GF factors are enabled | |
| 3886 // ppN2, ppHe partial pressures of N2 and He breathed | |
| 3887 // | |
| 3888 // Modified: NDL_time shortest NDL time found so far | |
| 3889 // NDL_tissue_lead leading tissue, i.e. tissue with the shortest NDL | |
| 3890 // | |
| 3891 static void calc_NDL_time_tissue(void) | |
| 0 | 3892 { |
| 623 | 3893 overlay unsigned char NDL_time_tissue = 0; // NDL time of this tissue, starting with 0 minutes |
| 3894 overlay unsigned char step_size = 10; // step size in searching, starting with 10 minutes | |
| 3895 overlay float pres_limit; // max. tissue pressure allowed | |
| 3896 | |
| 3897 #ifdef _helium | |
| 3898 overlay float last_pres_tissue_N2; // last tissue pressure for N2 | |
| 3899 overlay float last_pres_tissue_He; // last tissue pressure for He | |
| 3900 #else | |
| 3901 overlay float last_pres_tissue; // last tissue pressure | |
| 3902 #endif | |
| 3903 | |
| 3904 | |
| 3905 // set the compartment index ci for reading the Buhlmann increments and coefficients | |
| 3906 ci = NDL_tissue; | |
| 3907 | |
| 3908 // read the tissue increments for a step size of 10 minutes | |
| 3909 read_Buhlmann_times(2); | |
| 3910 | |
| 3911 // read Buhlmann a and b coefficients for tissue ci | |
| 3912 read_Buhlmann_coefficients(); | |
| 3913 | |
| 3914 #ifdef _helium | |
| 3915 | |
| 3916 // get the current simulated tissue pressures | |
| 3917 calc_pres_tissue_N2 = last_pres_tissue_N2 = sim_pres_tissue_N2[ci]; | |
| 3918 calc_pres_tissue_He = last_pres_tissue_He = sim_pres_tissue_He[ci]; | |
| 3919 | |
| 3920 #else | |
| 3921 | |
| 3922 // get the current simulated tissue pressure | |
| 650 | 3923 calc_pres_tissue = last_pres_tissue = sim_pres_tissue_N2[ci]; |
| 623 | 3924 |
| 3925 // set the a and b coefficients | |
| 3926 adopt_Buhlmann_coefficients(); | |
| 3927 | |
| 3928 #endif | |
| 3929 | |
| 3930 // simulate an increasing bottom time and check when the NDL is hit | |
| 3931 for(;;) | |
| 582 | 3932 { |
| 623 | 3933 |
| 3934 #ifdef _helium | |
| 3935 | |
| 3936 // calculate the total tissue pressure | |
| 650 | 3937 calc_pres_tissue = calc_pres_tissue_N2 + calc_pres_tissue_He; |
| 582 | 3938 |
| 623 | 3939 // adopt a and b coefficients to current N2/He ratio inside the tissue |
| 3940 adopt_Buhlmann_coefficients(); | |
| 3941 | |
| 3942 #endif | |
| 3943 | |
| 3944 // compute the maximum tissue pressure allowed to be exposed to an | |
| 3945 // ambient pressure equaling the surface pressure | |
| 631 | 3946 if( char_I_model != 0 ) |
| 623 | 3947 { |
| 3948 // GF model enabled, this equation [2] is the inverse of equation [1] | |
| 3949 pres_limit = (1.0 - GF_high + GF_high / var_b) * pres_surface + GF_high * var_a; | |
| 3950 } | |
| 3951 else | |
| 582 | 3952 { |
| 623 | 3953 // straight Buhlmann |
| 3954 pres_limit = pres_surface / var_b + var_a; | |
| 3955 } | |
| 3956 | |
| 3957 // is the tissue pressure higher than the maximum tissue pressure allowed? | |
| 650 | 3958 if( calc_pres_tissue > pres_limit) |
| 623 | 3959 { |
| 3960 // YES - tissue is outside NDL | |
| 3961 | |
| 3962 // was the tissue outside NDL right from the start? | |
| 3963 if( NDL_time_tissue == 0 ) | |
| 582 | 3964 { |
| 623 | 3965 // YES - search can be aborted |
| 3966 | |
| 3967 // at least one tissue is outside NDL, so overall NDL time is zero | |
| 3968 NDL_time = 0; | |
| 3969 | |
| 3970 // store the number of this tissue as being the leading one | |
| 3971 NDL_tissue_lead = NDL_tissue; | |
| 3972 | |
| 3973 // done | |
| 582 | 3974 break; |
| 3975 } | |
| 3976 | |
| 623 | 3977 // when code execution passes here, the tissue has become |
| 3978 // being outside NDL after doing one or more search steps | |
| 3979 | |
| 3980 // still searching with a step size of 10 minutes? | |
| 3981 if( step_size == 10 ) | |
| 582 | 3982 { |
| 623 | 3983 // YES - retry with smaller step size |
| 3984 | |
| 3985 // go back to last NDL time | |
| 3986 NDL_time_tissue -= 10; | |
| 3987 | |
| 3988 #ifdef _helium | |
| 3989 | |
| 3990 // go back to last pressures | |
| 3991 calc_pres_tissue_N2 = last_pres_tissue_N2; | |
| 3992 calc_pres_tissue_He = last_pres_tissue_He; | |
| 3993 | |
| 3994 #else | |
| 3995 | |
| 3996 // go back to last pressure | |
| 650 | 3997 calc_pres_tissue = last_pres_tissue; |
| 623 | 3998 |
| 3999 #endif | |
| 4000 | |
| 4001 // reduce step size to 1 minute | |
| 4002 step_size = 1; | |
| 4003 | |
| 4004 // read the tissue increments for a step size of 1 minute | |
| 4005 read_Buhlmann_times(1); | |
| 4006 | |
| 4007 // redo search from last pressure & time within NDL with smaller step size | |
| 582 | 4008 continue; |
| 4009 } | |
| 623 | 4010 else |
| 582 | 4011 { |
| 623 | 4012 // NO - already tried with a step size of 1 minute |
| 4013 | |
| 4014 // go back to last NDL time that was within NDL | |
| 4015 NDL_time_tissue -= 1; | |
| 4016 | |
| 4017 // is the NDL time of this tissue shorter than the overall NDL time found so far? | |
| 4018 if( NDL_time_tissue < NDL_time ) | |
| 4019 { | |
| 4020 // YES - set this tissue's NDL time as the new overall NDL time | |
| 4021 NDL_time = NDL_time_tissue; | |
| 4022 | |
| 4023 // - store the number of this tissue as being the leading one | |
| 4024 NDL_tissue_lead = NDL_tissue; | |
| 4025 } | |
| 4026 | |
| 4027 // done | |
| 4028 break; | |
| 582 | 4029 } |
| 623 | 4030 } |
| 4031 else | |
| 582 | 4032 { |
| 623 | 4033 // NO - tissue is still within NDL |
| 4034 | |
| 4035 // The search can be terminated when the NDL time of this tissue | |
| 4036 // exceeds the overall NDL time, thus when a shorter NDL time has | |
| 4037 // already been found with another tissue. | |
| 4038 if( NDL_time_tissue >= NDL_time ) break; | |
| 4039 | |
| 4040 #ifdef _helium | |
| 4041 | |
| 4042 // back-up current tissue pressures | |
| 4043 last_pres_tissue_N2 = calc_pres_tissue_N2; | |
| 4044 last_pres_tissue_He = calc_pres_tissue_He; | |
| 4045 | |
| 4046 #else | |
| 4047 | |
| 4048 // back-up current tissue pressure | |
| 650 | 4049 last_pres_tissue = calc_pres_tissue; |
| 623 | 4050 |
| 4051 #endif | |
| 4052 | |
| 4053 // step forward NDL time of current tissue | |
| 4054 NDL_time_tissue += step_size; | |
| 4055 | |
| 4056 #ifdef _helium | |
| 4057 | |
| 4058 // step forward tissue pressure - N2 | |
| 4059 temp_tissue = (ppN2 - calc_pres_tissue_N2) * var_N2_e; // pressure delta breathed - tissue | |
| 4060 apply_saturation_factors(); // apply safety factor | |
| 4061 calc_pres_tissue_N2 += temp_tissue; // add pressure delta to tissue | |
| 4062 | |
| 4063 // step forward tissue pressure - He | |
| 4064 temp_tissue = (ppHe - calc_pres_tissue_He) * var_He_e; // pressure delta breathed - tissue | |
| 4065 apply_saturation_factors(); // apply safety factor | |
| 4066 calc_pres_tissue_He += temp_tissue; // add pressure delta to tissue | |
| 4067 | |
| 4068 #else | |
| 4069 | |
| 4070 // step forward tissue pressure | |
| 650 | 4071 temp_tissue = (ppN2 - calc_pres_tissue ) * var_N2_e; // pressure delta breathed - tissue |
| 623 | 4072 apply_saturation_factors(); // apply safety factor |
| 650 | 4073 calc_pres_tissue += temp_tissue; // add pressure delta to tissue |
| 623 | 4074 |
| 4075 #endif | |
| 4076 | |
| 582 | 4077 } |
| 623 | 4078 } |
| 0 | 4079 } |
| 4080 | |
| 604 | 4081 |
| 0 | 4082 ////////////////////////////////////////////////////////////////////////////// |
| 4083 // clear_deco_table | |
| 4084 // | |
| 623 | 4085 // Modified: internal_deco_time[] stop durations |
| 4086 // internal_deco_depth[] stop depths | |
| 4087 // internal_deco_gas[] gases used at stops | |
| 0 | 4088 // |
| 4089 static void clear_deco_table(void) | |
| 4090 { | |
| 623 | 4091 for( i = 0; i < NUM_STOPS; ++i ) |
| 582 | 4092 { |
| 623 | 4093 internal_deco_time [i] = 0; |
| 4094 internal_deco_depth[i] = 0; | |
| 4095 internal_deco_gas[i] = 0; | |
| 582 | 4096 } |
| 4097 | |
| 628 | 4098 // reset stop table index and chained stops counter |
| 4099 stop_index = 0; | |
| 4100 chained_stops = 0; | |
| 4101 | |
| 560 | 4102 // clear stop table overflow warning |
| 628 | 4103 deco_warnings &= ~DECO_WARNING_INCOMPLETE; |
| 0 | 4104 } |
| 4105 | |
| 623 | 4106 |
| 0 | 4107 ////////////////////////////////////////////////////////////////////////////// |
| 4108 // update_deco_table | |
| 4109 // | |
| 623 | 4110 // Add time to a stop at char_depth_sim |
| 560 | 4111 // |
| 4112 // It is possible to create stops with a duration of 0 minutes, e.g. to | |
| 4113 // note a gas change "on the fly" while ascending. Therefore the criteria | |
| 604 | 4114 // to have reached the end of the list is depth == 0. |
| 0 | 4115 // |
| 623 | 4116 // Input: char_depth_sim stop's depth, in meters |
| 4117 // sim_gas_current_num gas used at stop, as index 1..5 or 0 for gas 6 | |
| 4118 // time_increment number of minutes to add to the stop | |
| 4119 // | |
| 4120 // Updated: internal_deco_depth[] depth (in meters) of each stop | |
| 4121 // internal_deco_time [] time (in minutes) of each stop | |
| 4122 // internal_deco_gas [] gas used (index 1-5) at each stop | |
| 560 | 4123 // |
| 631 | 4124 static void update_deco_table(PARAMETER unsigned char time_increment) |
| 0 | 4125 { |
| 623 | 4126 assert( char_depth_sim > 0 ); // no stop at surface |
| 560 | 4127 |
| 628 | 4128 |
| 4129 // is there already a stop entry matching with the current depth and gas? | |
| 4130 if( internal_deco_depth[stop_index] == char_depth_sim ) | |
| 4131 if( internal_deco_gas [stop_index] == sim_gas_current_num ) | |
| 560 | 4132 { |
| 628 | 4133 // YES - increment stop time if possible, stop time entries are |
| 4134 // limited to 99 minutes because of display constraints | |
| 4135 if( internal_deco_time[stop_index] < (100 - time_increment) ) | |
| 560 | 4136 { |
| 628 | 4137 // YES - time increment fits into current stop entry, |
| 631 | 4138 // increment stop time |
| 628 | 4139 internal_deco_time[stop_index] += time_increment; |
| 631 | 4140 |
| 4141 // done | |
| 4142 return; | |
| 628 | 4143 } |
| 4144 else | |
| 4145 { | |
| 4146 // NO - A chained stop entry will be created further down in the | |
| 4147 // code to continue the stop, but we will limit the number | |
| 4148 // of chained stop table entries in order to abort an ever- | |
| 4149 // running deco calculation. Too many chained entries? | |
| 4150 if( ++chained_stops >= STOP_CHAINING_LIMIT ) | |
| 560 | 4151 { |
| 631 | 4152 // YES - set warning that calculations took too long |
| 628 | 4153 deco_warnings |= DECO_WARNING_INCOMPLETE; |
| 631 | 4154 |
| 4155 // done | |
| 4156 return; | |
| 560 | 4157 } |
| 4158 } | |
| 628 | 4159 } |
| 4160 | |
| 4161 // the current stop entry does not match the current depth and gas, | |
| 4162 // or hasn't enough room left for the time increment | |
| 4163 | |
| 4164 // is the current stop entry in use? | |
| 4165 if( internal_deco_depth[stop_index] > 0 ) | |
| 4166 { | |
| 4167 // YES - current entry is in use, need to move on | |
| 4168 // to next entry position if possible | |
| 4169 | |
| 4170 // have all entry positions been used up? | |
| 4171 if( stop_index < (NUM_STOPS - 1) ) | |
| 560 | 4172 { |
| 628 | 4173 // NO - move on to next entry position |
| 4174 stop_index += 1; | |
| 4175 } | |
| 4176 else | |
| 4177 { | |
| 631 | 4178 // YES - if run in deco calculator mode, set a warning that there is an overflow in the stops table |
| 4179 if( main_status & CALCULATE_BOTTOM ) deco_warnings |= DECO_WARNING_INCOMPLETE; | |
| 4180 | |
| 4181 // limit runtime via reached TTS (scaled in 1/10 minutes here) | |
| 4182 if( TTS_time > 9999 ) deco_warnings |= DECO_WARNING_INCOMPLETE; | |
| 4183 | |
| 4184 // done | |
| 4185 return; | |
| 560 | 4186 } |
| 4187 } | |
| 4188 | |
| 631 | 4189 // initial use of a new (or the very first) stop entry, store all stop data |
| 628 | 4190 internal_deco_time [stop_index] = time_increment; |
| 4191 internal_deco_depth[stop_index] = char_depth_sim; | |
| 4192 internal_deco_gas [stop_index] = sim_gas_current_num; | |
| 631 | 4193 |
| 4194 // done | |
| 4195 return; | |
| 628 | 4196 } |
| 4197 | |
| 4198 | |
| 4199 ////////////////////////////////////////////////////////////////////////////// | |
| 4200 // publish_deco_table | |
| 4201 // | |
| 4202 // Input: internal_deco_depth[] depth in internal stops table | |
| 4203 // internal_deco_time[] times ... | |
| 4204 // internal_deco_gas[] gases ... | |
| 4205 // | |
| 4206 // Output: char_O_deco_depth[] depth in the external stops table | |
| 4207 // char_O_deco_time[] times ... | |
| 4208 // char_O_deco_gas[] gases ... | |
| 4209 // char_O_deco_time_for_log times in reverse order | |
| 4210 // | |
| 4211 static void publish_deco_table(void) | |
| 4212 { | |
| 4213 overlay unsigned char x = stop_index; | |
| 4214 overlay unsigned char y; | |
| 4215 | |
| 4216 | |
| 4217 // copy depth, time and gas from internal to external stops table | |
| 4218 for( y = 0; y < NUM_STOPS; y++ ) | |
| 4219 { | |
| 4220 char_O_deco_depth[y] = internal_deco_depth[y]; | |
| 4221 char_O_deco_time [y] = internal_deco_time [y]; | |
| 4222 char_O_deco_gas [y] = internal_deco_gas [y]; | |
| 4223 } | |
| 4224 | |
| 4225 // copy times of shallowest stops to logging table | |
| 4226 for(y = 0; y < NUM_STOPS_LOG; x-- ) | |
| 4227 { | |
| 4228 // copy all stops that have a non-null stop time | |
| 4229 if( internal_deco_time[x] ) | |
| 4230 char_O_deco_time_for_log[y++] = internal_deco_time[x]; | |
| 4231 | |
| 4232 // abort if all stops are copied | |
| 4233 if( x == 0) break; | |
| 4234 } | |
| 4235 | |
| 4236 // fill the remainder of the logging table with null | |
| 4237 // if it is not completely filled already | |
| 4238 while( y < NUM_STOPS_LOG ) | |
| 4239 { | |
| 4240 char_O_deco_time_for_log[y++] = 0; | |
| 4241 } | |
| 0 | 4242 } |
| 4243 | |
| 4244 | |
| 4245 ////////////////////////////////////////////////////////////////////////////// | |
| 623 | 4246 // calc_desaturation_time_helper |
| 0 | 4247 // |
| 560 | 4248 // Helper function |
| 4249 // | |
| 623 | 4250 // Input: pres_actual current tissue pressure |
| 4251 // pres_target target tissue pressure | |
| 4252 // var_ht half-time of the tissue | |
| 4253 // desat_factor desaturation factor | |
| 4254 // | |
| 4255 // Output: int_time time needed by tissue to reach target pressure | |
| 4256 // | |
| 604 | 4257 static void calc_desaturation_time_helper(void) |
| 0 | 4258 { |
| 623 | 4259 // check if actual pressure is higher then target pressure |
| 4260 if( pres_actual > pres_target ) | |
| 4261 { | |
| 4262 // YES - compute remaining time | |
| 4263 | |
| 604 | 4264 overlay float pres_ratio; |
| 582 | 4265 |
| 623 | 4266 // compute pressure ratio to archive |
| 560 | 4267 pres_ratio = pres_actual / pres_target; |
| 4268 | |
| 4269 // Compute desaturation time with result rounded up to multiples of 10 minutes. | |
| 582 | 4270 // Main purpose is to avoid confusion, because the times do not clock down in |
| 4271 // one minute steps any more but get constantly re-computed according to current | |
| 4272 // ambient pressure and may therefor make steps of several minutes forwards and | |
| 604 | 4273 // backwards as ambient pressure rises/falls and N2/He ratio is being adjusted. |
| 623 | 4274 int_time = (unsigned short)( (var_ht * log(pres_ratio) / desat_factor) + 0.9 ); |
| 560 | 4275 } |
| 4276 else | |
| 623 | 4277 { |
| 4278 // NO - desaturation state reached, no remaining time | |
| 582 | 4279 int_time = 0; |
| 560 | 4280 } |
| 4281 } | |
| 4282 | |
| 623 | 4283 |
| 560 | 4284 ///////////////////////////////////////////////////////////////////////////// |
| 604 | 4285 // calc_desaturation_time |
| 4286 // | |
| 623 | 4287 // Calculates the time needed for the tissues to equilibrate with |
| 4288 // surface pressure and the no-fly / no-altitude time. | |
| 4289 // | |
| 4290 // Input: int_I_pres_surface | |
| 4291 // char_I_desaturation_multiplier | |
| 4292 // | |
| 4293 // Output: int_O_desaturation_time | |
| 4294 // int_O_nofly_time | |
| 560 | 4295 // |
| 4296 void calc_desaturation_time(void) | |
| 4297 { | |
| 623 | 4298 overlay float P_ambient_altitude; |
| 4299 | |
| 604 | 4300 assert( 800 < int_I_pres_surface && int_I_pres_surface < 1100 ); |
| 4301 assert( 0 < char_I_desaturation_multiplier && char_I_desaturation_multiplier <= 100 ); | |
| 4302 | |
| 4303 | |
| 623 | 4304 // safeguard and convert surface pressure |
| 4305 if( int_I_pres_surface < 500) pres_surface = 0.5; | |
| 4306 else pres_surface = 0.001 * int_I_pres_surface; | |
| 4307 | |
| 4308 // calculate partial pressure of N2 in respired air at surface pressure | |
| 4309 calc_N2_equilibrium(); | |
| 4310 | |
| 4311 // get, safeguard and convert the saturation and desaturation factors | |
| 4312 get_saturation_factors(); | |
| 4313 | |
| 4314 // pre-computed term for later use: 10 [Min] * 0.6931 [=log(2)] * 1 [Desat Factor] * ... | |
| 4315 desat_factor = (6.931 * SURFACE_DESAT_FACTOR) * float_desaturation_multiplier; | |
| 582 | 4316 |
| 4317 // initialize vars | |
| 560 | 4318 int_O_desaturation_time = 0; |
| 582 | 4319 int_O_nofly_time = 0; |
| 4320 | |
| 623 | 4321 // get selected target altitude |
| 4322 switch( char_I_altitude_wait ) | |
| 4323 { | |
| 4324 case 1: P_ambient_altitude = P_ambient_1000m; break; | |
| 4325 case 2: P_ambient_altitude = P_ambient_2000m; break; | |
| 4326 case 3: P_ambient_altitude = P_ambient_3000m; break; | |
| 4327 default: P_ambient_altitude = P_ambient_fly; break; | |
| 4328 } | |
| 4329 | |
| 4330 // loop over all compartments in order slowest to fastest | |
| 604 | 4331 for( ci = NUM_COMP; ci > 0; ) |
| 582 | 4332 { |
| 623 | 4333 overlay float pres_tissue_max; |
| 4334 overlay unsigned short nofly_last = ~0; | |
| 4335 overlay unsigned short nofly_N2 = 0; | |
| 4336 | |
| 4337 #ifdef _helium | |
| 4338 overlay signed char search_direction; | |
| 4339 overlay unsigned short nofly_He = 0; | |
| 4340 #endif | |
| 4341 | |
| 4342 | |
| 4343 // decrement compartment index | |
| 560 | 4344 ci -= 1; |
| 582 | 4345 |
| 623 | 4346 // get the Buhlmann halftimes and coefficients |
| 582 | 4347 read_Buhlmann_ht(); |
| 560 | 4348 read_Buhlmann_coefficients(); |
| 582 | 4349 |
| 623 | 4350 |
| 4351 // | |
| 4352 // Desaturation time | |
| 4353 // | |
| 4354 | |
| 4355 // calculate desaturation time for N2 in tissue, | |
| 4356 // desaturated state is defined as residual tissue pressure <= 1.05 x ppN2 respired | |
| 4357 | |
| 4358 // current tissue pressure above equilibrium pressure | |
| 4359 pres_actual = real_pres_tissue_N2[ci] - N2_equilibrium; | |
| 4360 | |
| 4361 // target pressure above equilibrium pressure | |
| 4362 pres_target = 0.05 * N2_equilibrium; | |
| 4363 | |
| 4364 // half-time of the current tissue | |
| 4365 var_ht = var_N2_ht; | |
| 4366 | |
| 4367 // calculate desaturation time | |
| 4368 calc_desaturation_time_helper(); | |
| 4369 | |
| 4370 // store desaturation time if it is longer than longest found so far | |
| 4371 if( int_time > int_O_desaturation_time) int_O_desaturation_time = int_time; | |
| 4372 | |
| 4373 | |
| 4374 #ifdef _helium | |
| 4375 | |
| 4376 // calculate desaturation time for He in the tissue, | |
| 4377 // desaturated state is defined as residual tissue pressure <= 0.05 x ppN2 respired | |
| 4378 | |
| 4379 // actual tissue pressure above equilibrium: equilibrium for He is 0 bar | |
| 4380 pres_actual = real_pres_tissue_He[ci]; | |
| 4381 | |
| 4382 // target pressure above equilibrium pressure: use same target pressure as for N2 | |
| 4383 pres_target = 0.05 * N2_equilibrium; | |
| 4384 | |
| 4385 // half-time of the current tissue | |
| 4386 var_ht = var_He_ht; | |
| 4387 | |
| 4388 // calculate desaturation time | |
| 4389 calc_desaturation_time_helper(); | |
| 4390 | |
| 4391 // store desaturation time if it is longer than longest found so far | |
| 4392 if( int_time > int_O_desaturation_time) int_O_desaturation_time = int_time; | |
| 4393 | |
| 4394 #endif | |
| 4395 | |
| 4396 // | |
| 4397 // no-fly time | |
| 4398 // | |
| 582 | 4399 |
| 560 | 4400 // Target pressure for the tissue is the Buhlmann limit. We use the Buhlmann |
| 4401 // coefficients for N2 also for He because it is easier to calculate and the | |
| 4402 // N2 coefficients are more conservative than those for He, so we are on the | |
| 4403 // safe side, too. | |
| 582 | 4404 pres_tissue_max = (P_ambient_altitude/var_N2_b + var_N2_a); |
| 4405 | |
| 623 | 4406 // adjust target pressure by GF-high in case the GF model is in use, but not |
| 4407 // for the no-fly time as it's target pressure is hard to reach anyhow | |
| 631 | 4408 if( char_I_model && char_I_altitude_wait ) |
| 623 | 4409 pres_tissue_max = P_ambient_altitude + |
| 4410 0.01 * char_I_GF_High_percentage * (pres_tissue_max - P_ambient_altitude); | |
| 4411 | |
| 4412 | |
| 4413 #ifdef _helium | |
| 4414 | |
| 4415 //---- Variant with Helium ------------------------------------------- | |
| 4416 | |
| 4417 // initialize split_N2_He in case there was a hard reboot / memory clear | |
| 604 | 4418 if( split_N2_He[ci] == 0 ) split_N2_He[ci] = 90; |
| 4419 | |
| 560 | 4420 // initialize search direction |
| 4421 search_direction = 0; | |
| 582 | 4422 |
| 560 | 4423 for(;;) |
| 4424 { | |
| 4425 // Calculate no-fly time for N2 in the tissue. | |
| 4426 // Flying is permitted when the N2 pressure fits into the assigned fraction above equilibrium. | |
| 4427 | |
| 623 | 4428 // current tissue pressure above equilibrium |
| 4429 pres_actual = real_pres_tissue_N2[ci] - N2_equilibrium; | |
| 4430 | |
| 4431 // target pressure above equilibrium pressure, weighted by N2/He split | |
| 560 | 4432 pres_target = (split_N2_He[ci] * 0.01) * (pres_tissue_max - N2_equilibrium); |
| 4433 | |
| 623 | 4434 // half-time of the current tissue |
| 4435 var_ht = var_N2_ht; | |
| 4436 | |
| 4437 // check if desaturation to target pressure is possible at all | |
| 4438 if( pres_target < 0.0 ) | |
| 560 | 4439 { |
| 623 | 4440 // NO - set no-fly time to 288 * 10 min = 48 h |
| 4441 int_O_nofly_time = 288; | |
| 4442 break; | |
| 560 | 4443 } |
| 604 | 4444 else |
| 560 | 4445 { |
| 623 | 4446 // YES - calculate desaturation time |
| 560 | 4447 calc_desaturation_time_helper(); |
| 623 | 4448 |
| 4449 // store time found | |
| 582 | 4450 nofly_N2 = int_time; |
| 560 | 4451 } |
| 582 | 4452 |
| 623 | 4453 // calculate no-fly time for He in the tissue, |
| 4454 // flying is permitted when the He pressure fits into the assigned fraction | |
| 4455 | |
| 4456 // current tissue pressure above equilibrium: equilibrium for He is 0 bar | |
| 4457 pres_actual = real_pres_tissue_He[ci]; | |
| 4458 | |
| 4459 // target pressure above equilibrium pressure, weighted by N2/He split | |
| 4460 pres_target = ((100 - split_N2_He[ci]) * 0.01) * (pres_tissue_max - N2_equilibrium); | |
| 4461 | |
| 4462 // half-time of the current tissue | |
| 582 | 4463 var_ht = var_He_ht; |
| 4464 | |
| 623 | 4465 // calculate desaturation time |
| 560 | 4466 calc_desaturation_time_helper(); |
| 623 | 4467 |
| 4468 // store time found | |
| 582 | 4469 nofly_He = int_time; |
| 560 | 4470 |
| 4471 | |
| 4472 // Because the sum of N2 and He tissue pressures needs to fit into the Buhlmann limit for | |
| 4473 // no-fly time calculation, each gas gets assigned a fraction of the available total pressure | |
| 623 | 4474 // limit. The optimum split between the two gases can not be computed by a single formula, |
| 560 | 4475 // because this would require the inversion of a function with two exponential terms, which is |
| 4476 // not possible. We do not want to do a computational complex simulation here like it is done | |
| 4477 // in the deco calculation code (although we tackle the same base problem here), so we just let | |
| 4478 // the computer try out which split will balance the no-fly times induced by the N2 and the He | |
| 4479 // at best. | |
| 582 | 4480 |
| 560 | 4481 // first of all, skip any optimization in case the current compartment is not the leading one |
| 4482 if( (nofly_N2 <= int_O_nofly_time) && (nofly_He <= int_O_nofly_time) ) break; | |
| 4483 | |
| 4484 // check if the N2 requires more waiting time than the He | |
| 582 | 4485 if( nofly_N2 >= nofly_He ) |
| 560 | 4486 { |
| 4487 // check if the search direction has changed, which means we are beyond the | |
| 4488 // optimum now, or if we are at the upper stop limit of split_N2_He | |
| 4489 if( (search_direction < 0) || (split_N2_He[ci] == 99) ) | |
| 604 | 4490 { |
| 623 | 4491 // either the just completed iteration was more close to the optimum or the one before |
| 4492 // was, so we take the best (i.e. shortest) time of both as the final no-fly time | |
| 560 | 4493 int_O_nofly_time = (nofly_N2 < nofly_last) ? nofly_N2 : nofly_last; |
| 623 | 4494 |
| 4495 // done | |
| 560 | 4496 break; |
| 4497 } | |
| 4498 | |
| 4499 // store the no-fly time found in this iteration | |
| 582 | 4500 nofly_last = nofly_N2; |
| 4501 | |
| 623 | 4502 // increase the N2 fraction of the split |
| 560 | 4503 split_N2_He[ci] += 1; |
| 623 | 4504 |
| 4505 // set search direction towards more N2 | |
| 560 | 4506 search_direction = +1; |
| 4507 } | |
| 4508 else | |
| 4509 { | |
| 4510 // check if the search direction has changed, which means we are beyond the | |
| 4511 // optimum now, or if we are at the lower stop limit of split_N2_He | |
| 4512 if( (search_direction > 0) || (split_N2_He[ci] == 1) ) | |
| 582 | 4513 { |
| 623 | 4514 // either the just completed iteration was more close to the optimum or the one before |
| 4515 // was, so we take the best (i.e. shortest) time of both as the final no-fly time | |
| 560 | 4516 int_O_nofly_time = (nofly_He < nofly_last) ? nofly_He : nofly_last; |
| 623 | 4517 |
| 4518 // done | |
| 560 | 4519 break; |
| 4520 } | |
| 4521 | |
| 4522 // store the no-fly time found in this iteration | |
| 582 | 4523 nofly_last = nofly_He; |
| 4524 | |
| 623 | 4525 // decrease the N2 fraction of the split |
| 560 | 4526 split_N2_He[ci] -= 1; |
| 623 | 4527 |
| 4528 // set search direction towards less N2 | |
| 604 | 4529 search_direction = -1; |
| 560 | 4530 } |
| 582 | 4531 |
| 560 | 4532 } // for(;;) |
| 4533 | |
| 623 | 4534 #else |
| 4535 | |
| 4536 //---- Variant without Helium ---------------------------------------- | |
| 4537 | |
| 4538 // current tissue pressure above equilibrium | |
| 4539 pres_actual = real_pres_tissue_N2[ci] - N2_equilibrium; | |
| 4540 | |
| 4541 // target pressure above equilibrium pressure | |
| 4542 pres_target = pres_tissue_max - N2_equilibrium; | |
| 4543 | |
| 4544 // half-time of the current tissue | |
| 4545 var_ht = var_N2_ht; | |
| 4546 | |
| 4547 // check if desaturation to target pressure is possible at all | |
| 4548 if( pres_target < 0.0 ) | |
| 4549 { | |
| 4550 // NO - set no-fly time to 288 * 10 min = 48 h | |
| 4551 int_O_nofly_time = 288; | |
| 4552 } | |
| 4553 else | |
| 4554 { | |
| 4555 // YES - calculate desaturation time | |
| 4556 calc_desaturation_time_helper(); | |
| 4557 | |
| 4558 // - extend desaturation time if this tissue needs | |
| 4559 // more time than already found to be needed | |
| 4560 if( int_time > int_O_nofly_time ) int_O_nofly_time = int_time; | |
| 4561 } | |
| 4562 | |
| 4563 #endif | |
| 4564 | |
| 560 | 4565 } // for(compartments) |
| 4566 | |
| 582 | 4567 |
| 623 | 4568 // rescale int_O_desaturation_time and int_O_nofly_time to full minutes for display purpose |
| 560 | 4569 int_O_desaturation_time *= 10; |
| 4570 int_O_nofly_time *= 10; | |
| 582 | 4571 |
| 623 | 4572 // limit int_O_desaturation_time and int_O_nofly_time to 5999 = 99 hours + 59 minutes |
| 4573 // because of display space constraints and rounding done above | |
| 560 | 4574 if( int_O_desaturation_time > 5999 ) int_O_desaturation_time = 5999; |
| 4575 if( int_O_nofly_time > 5999 ) int_O_nofly_time = 5999; | |
| 4576 | |
| 4577 | |
| 623 | 4578 // Clear the micro bubbles warning when the current gradient factor is < 100%. |
| 604 | 4579 // The current gradient factor is calculated by calc_interval() while not in diving mode. |
| 4580 // As the locked warning will stay set, this will cause the warning be be displayed in | |
| 4581 // attention color instead of warning color. | |
| 623 | 4582 if( int_O_lead_supersat < 100 ) |
| 4583 deco_warnings &= ~DECO_WARNING_MBUBBLES; | |
| 582 | 4584 |
| 560 | 4585 // clear some warnings when the desaturation time has become zero |
| 582 | 4586 if( int_O_desaturation_time == 0 ) |
| 623 | 4587 deco_warnings &= ~( DECO_WARNING_IBCD + DECO_WARNING_IBCD_lock |
| 4588 + DECO_WARNING_MBUBBLES + DECO_WARNING_MBUBBLES_lock | |
| 4589 + DECO_WARNING_OUTSIDE + DECO_WARNING_OUTSIDE_lock | |
| 4590 + DECO_ATTENTION_OUTSIDE ); | |
| 0 | 4591 } |
| 4592 | |
| 623 | 4593 |
| 0 | 4594 ////////////////////////////////////////////////////////////////////////////// |
| 582 | 4595 // Calculate desaturation of the real tissues for a given time interval |
| 0 | 4596 // |
| 582 | 4597 // Caution: Works on the real tissues! |
| 4598 // If in doubt, use this function only inside a context surrounded with | |
| 4599 // push_tissues_to_vault() / pull_tissues_from_vault() ! | |
| 4600 // | |
| 623 | 4601 // Input: int_I_pres_surface surface pressure in mbar |
| 4602 // time_interval time interval in minutes, must be limited to 254 at max | |
| 4603 // | |
| 4604 // Modified: tissue pressures N2 and He pressures of the tissues | |
| 4605 // CNS_fraction_real current real CNS value | |
| 631 | 4606 // ceiling minimum allowed depth in bar relative pressure |
| 623 | 4607 // lead_supersat supersaturation of the leading tissue (float) |
| 4608 // int_O_lead_supersat supersaturation of the leading tissue (integer) | |
| 631 | 4609 // char_O_lead_tissue number of the leading tissue |
| 560 | 4610 // |
| 582 | 4611 static void calc_interval(PARAMETER unsigned char time_interval) |
| 0 | 4612 { |
| 582 | 4613 overlay unsigned char time; |
| 4614 | |
| 4615 assert( 800 < int_I_pres_surface && int_I_pres_surface < 1100 ); | |
| 604 | 4616 assert( 100 <= char_I_saturation_multiplier && char_I_saturation_multiplier < 200 ); |
| 4617 assert( 0 < char_I_desaturation_multiplier && char_I_desaturation_multiplier <= 100 ); | |
| 4618 | |
| 4619 | |
| 623 | 4620 // safeguard and convert surface pressure |
| 4621 if( int_I_pres_surface < 500) pres_surface = 0.500; | |
| 4622 else pres_surface = 0.001 * int_I_pres_surface; | |
| 4623 | |
| 631 | 4624 // safeguard time interval |
| 4625 if( time_interval > 254 ) time_interval = 254; | |
| 4626 | |
| 623 | 4627 // set breathed pressure to surface pressure |
| 4628 real_pres_respiration = pres_surface; | |
| 4629 | |
| 4630 // calculate partial pressure of N2 in respired air at surface pressure | |
| 4631 calc_N2_equilibrium(); | |
| 4632 | |
| 4633 // calculate partial pressures (0.7902 is fraction of N2 in atmosphere as of Buhlmann) | |
| 4634 ppN2 = N2_equilibrium; | |
| 4635 ppHe = 0.0; | |
| 4636 | |
| 4637 // get, safeguard and convert the saturation and desaturation factors | |
| 4638 get_saturation_factors(); | |
| 4639 | |
| 4640 // adjust desaturation factor to surface mode | |
| 4641 float_desaturation_multiplier *= SURFACE_DESAT_FACTOR; | |
| 582 | 4642 |
| 4643 // Calculate the tissues: | |
| 4644 // Because calc_tissues() can calculate for 127 minutes at max, | |
| 4645 // the tissue updating may need to be done in two chunks. | |
| 4646 | |
| 4647 time = time_interval; | |
| 4648 | |
| 4649 // first chunk for the part exceeding 127 minutes | |
| 4650 if( time > 127) | |
| 560 | 4651 { |
| 582 | 4652 // do a full 127 minutes on the real tissues |
| 623 | 4653 tissue_increment = TISSUE_SELECTOR | 127; |
| 582 | 4654 calc_tissues(); |
| 4655 | |
| 623 | 4656 // determine the remaining time |
| 582 | 4657 time -= 127; |
| 560 | 4658 } |
| 4659 | |
| 623 | 4660 // program the remaining time (or full time if not exceeding 127 minutes) on the real tissues |
| 4661 tissue_increment = TISSUE_SELECTOR | time; | |
| 604 | 4662 |
| 4663 // update the N2 and He pressures in the tissues | |
| 582 | 4664 calc_tissues(); |
| 4665 | |
| 560 | 4666 |
| 4667 // Calculate CNS: | |
| 4668 // To speed up things and because on most invocations of this code char_I_dive_interval | |
| 4669 // is a multiple of 10 minutes, we loop the loop-counter down using two speeds. | |
| 4670 | |
| 582 | 4671 time = time_interval; |
| 4672 | |
| 604 | 4673 while( time ) |
| 560 | 4674 { |
| 582 | 4675 if( time > 9 ) |
| 560 | 4676 { |
| 623 | 4677 CNS_fraction_real *= 0.925874712; // half-time = 90 min -> 10 min: (1/2)^(1/9) |
| 4678 time -= 10; // fast speed looping | |
| 560 | 4679 } |
| 4680 else | |
| 4681 { | |
| 623 | 4682 CNS_fraction_real *= 0.992327946; // half-time = 90 min -> 1 min: (1/2)^(1/90) |
| 4683 time -= 1; // slow speed looping | |
| 560 | 4684 } |
| 582 | 4685 } |
| 560 | 4686 |
| 623 | 4687 // convert the CNS value to integer |
| 4688 convert_cur_CNS_for_display(); | |
| 4689 | |
| 4690 // calculate the supersaturation of the leading tissue, the | |
| 4691 // negative argument puts calc_limit() into surface mode | |
| 4692 // Attention: do not pass char_I_GF_High_percentage as an argument | |
| 4693 // here because it is not configured outside dive mode | |
| 4694 calc_limit(-1.0); | |
| 4695 | |
| 4696 // convert the saturation value of the leading tissue to integer | |
| 4697 convert_sat_for_display(); | |
| 0 | 4698 } |
| 4699 | |
| 560 | 4700 |
| 4701 ////////////////////////////////////////////////////////////////////////////// | |
| 604 | 4702 // calc_CNS |
| 560 | 4703 // |
| 623 | 4704 // Input: char_ppO2 current ppO2 [in 0.1 bars] |
| 631 | 4705 // tissue_increment tissue selector and time interval |
| 623 | 4706 // |
| 4707 // Modified: CNS_fraction_real accumulated CNS (real tissue context) | |
| 4708 // CNS_fraction_sim accumulated CNS (simulated tissue context) | |
| 560 | 4709 // |
| 604 | 4710 static void calc_CNS(void) |
| 560 | 4711 { |
| 604 | 4712 overlay float CNS_fraction_inc; // increment of CNS load, 0.01 = 1% |
| 623 | 4713 |
| 4714 | |
| 631 | 4715 // calculate CNS increment for a 2 seconds interval |
| 623 | 4716 if( char_ppO2 > 160 ) |
| 4717 { | |
| 4718 // step-wise CNS increment | |
| 4719 | |
| 631 | 4720 // calculate index for increment look-up (uses integer division) |
| 4721 cns_i = (char_ppO2 - 161) / 5; | |
| 623 | 4722 |
| 628 | 4723 // indexes > 17 use increment of index 17 |
| 4724 if( cns_i > 17 ) cns_i = 17; | |
| 4725 | |
| 623 | 4726 // read coefficient (increment) |
| 4727 read_CNS_c_coefficient(); | |
| 4728 | |
| 4729 // re-scale coefficient from storage format in [1/100000] to productive value | |
| 631 | 4730 CNS_fraction_inc = (float)var_cns_value / 100000.0; |
| 623 | 4731 } |
| 4732 else if( char_ppO2 > 50 ) | |
| 4733 { | |
| 4734 // range wise CNS increment approximation | |
| 4735 | |
| 631 | 4736 // calculate index for approximation coefficients look-up (uses integer division) |
| 4737 cns_i = (char_ppO2 - 51) / 10; | |
| 623 | 4738 |
| 4739 // read coefficients | |
| 4740 read_CNS_ab_coefficient(); | |
| 4741 | |
| 4742 // calculate the CNS increment | |
| 631 | 4743 CNS_fraction_inc = 1.0 / (var_cns_gain * char_ppO2 + var_cns_offset ); |
| 623 | 4744 } |
| 4745 else | |
| 631 | 4746 { // no increment for a ppO2 of up to 0.5 bar |
| 623 | 4747 CNS_fraction_inc = 0.0; |
| 4748 } | |
| 4749 | |
| 631 | 4750 // apply a time factor in case of: |
| 4751 // - simulated tissues and interval = 0 (i.e. 6 seconds to do) -> factor 3 | |
| 4752 // - any tissues and interval > 0 (i.e. i minutes to do) -> factor 30 * i | |
| 4753 if( tissue_increment == 0 ) CNS_fraction_inc *= 3.0; | |
| 4754 else if( tissue_increment & TIME_MASK ) CNS_fraction_inc *= 30.0 * (float)(tissue_increment & TIME_MASK); | |
| 4755 | |
| 604 | 4756 |
| 4757 // update the CNS accumulator | |
| 623 | 4758 if ( tissue_increment & TISSUE_SELECTOR ) CNS_fraction_real += CNS_fraction_inc; // real tissues |
| 4759 else CNS_fraction_sim += CNS_fraction_inc; // simulated tissues | |
| 4760 } | |
| 4761 | |
| 4762 | |
| 4763 ////////////////////////////////////////////////////////////////////////////// | |
| 631 | 4764 // calc_required_volume |
| 623 | 4765 // |
| 4766 // Calculates the gas volume required for a given depth, time and usage (SAC) | |
| 4767 // rate. It uses a fixed surface pressure of 1.0 bar to deliver stable results | |
| 4768 // when used through the deco calculator. | |
| 4769 // | |
| 628 | 4770 // Input: gas_needs_depth depth in meters |
| 631 | 4771 // gas_needs_time time in minutes (0 encodes 1/10 minute) |
| 628 | 4772 // gas_needs_usage_rate gas usage in liters per minute at surface pressure |
| 623 | 4773 // |
| 628 | 4774 // Output: gas_needs_volume_due required gas volume in liters |
| 623 | 4775 // |
| 631 | 4776 static void calc_required_volume(void) |
| 623 | 4777 { |
| 631 | 4778 // calculate volume for 1 minute |
| 4779 gas_needs_volume_due = ((float)gas_needs_depth * METER_TO_BAR + pres_surface) * gas_needs_usage_rate; | |
| 4780 | |
| 4781 // multiply 1-minute-volume with time factor if time factor <> 1 | |
| 4782 if ( gas_needs_time == 0 ) gas_needs_volume_due *= 0.1; // 1/10 minute | |
| 4783 else if ( gas_needs_time > 1 ) gas_needs_volume_due *= gas_needs_time; // multiple minutes | |
| 0 | 4784 } |
| 4785 | |
| 560 | 4786 |
| 631 | 4787 |
| 4788 #ifdef _rx_functions | |
| 4789 | |
| 0 | 4790 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 4791 // calc_TR_functions |
| 4792 // | |
| 4793 // Process Pressure Readings (OSTC TR only) | |
| 4794 // | |
| 4795 // Input: todo | |
| 4796 // | |
| 4797 // Output: todo | |
| 4798 // | |
| 4799 static void calc_TR_functions(void) | |
| 560 | 4800 { |
| 623 | 4801 // pressure warnings for reading 1, but only if enabled and pressure value available |
| 4802 if( (char_I_pressure_gas[0] > 0) && !(int_IO_pressure_value[0] & INT_FLAG_NOT_AVAIL) ) | |
| 604 | 4803 { |
| 623 | 4804 overlay unsigned short pressure_value = int_IO_pressure_value[0] & ~INT_FLAG_OUTDATED; |
| 4805 | |
| 4806 if( (char_I_pressure_gas[0] < 6 ) && !(int_O_pressure_need[0] & INT_FLAG_NOT_AVAIL) ) | |
| 4807 { | |
| 4808 // not a diluent and need available: warning & attention by need | |
| 4809 if ( pressure_value <= int_O_pressure_need[0]) | |
| 4810 int_IO_pressure_value[0] |= INT_FLAG_WARNING; | |
| 4811 else if( pressure_value <= int_O_pressure_need[0] + int_O_pressure_need[0] / 2 ) | |
| 4812 int_IO_pressure_value[0] |= INT_FLAG_ATTENTION; | |
| 4813 } | |
| 4814 else | |
| 4815 { | |
| 4816 // a diluent or need not available: warning & attention by fixed thresholds | |
| 4817 if ( pressure_value <= PRESSURE_LIMIT_WARNING ) int_IO_pressure_value[0] |= INT_FLAG_WARNING; | |
| 4818 else if ( pressure_value <= PRESSURE_LIMIT_ATTENTION ) int_IO_pressure_value[0] |= INT_FLAG_ATTENTION; | |
| 4819 } | |
| 604 | 4820 } |
| 4821 | |
| 623 | 4822 // pressure warnings for reading 2, but only if enabled and pressure value available |
| 4823 if( (char_I_pressure_gas[1] > 0) && !(int_IO_pressure_value[1] & INT_FLAG_NOT_AVAIL) ) | |
| 560 | 4824 { |
| 623 | 4825 overlay unsigned short pressure_value = int_IO_pressure_value[1] & ~INT_FLAG_OUTDATED; |
| 4826 | |
| 4827 if( (char_I_pressure_gas[1] < 6 ) && !(int_O_pressure_need[1] & INT_FLAG_NOT_AVAIL) ) | |
| 560 | 4828 { |
| 623 | 4829 // not a diluent and need available: warning & attention by need |
| 4830 if ( pressure_value <= int_O_pressure_need[1]) | |
| 4831 int_IO_pressure_value[1] |= INT_FLAG_WARNING; | |
| 4832 else if ( pressure_value <= int_O_pressure_need[1] + int_O_pressure_need[1] / 2 ) | |
| 4833 int_IO_pressure_value[1] |= INT_FLAG_ATTENTION; | |
| 560 | 4834 } |
| 4835 else | |
| 4836 { | |
| 623 | 4837 // a diluent or need not available: warning & attention by fixed thresholds |
| 4838 if ( pressure_value <= PRESSURE_LIMIT_WARNING ) int_IO_pressure_value[1] |= INT_FLAG_WARNING; | |
| 4839 else if ( pressure_value <= PRESSURE_LIMIT_ATTENTION ) int_IO_pressure_value[1] |= INT_FLAG_ATTENTION; | |
| 560 | 4840 } |
| 4841 } | |
| 582 | 4842 |
| 623 | 4843 //--- SAC Calculation --------------------------------------------------------------------- |
| 4844 // | |
| 4845 // char_I_SAC_mode =0: disabled | |
| 4846 // =1: SAC from 1st reading | |
| 4847 // =2: SAC from 2nd reading | |
| 4848 // =3: SAC from higher one of both pressure drops (independent double mode) | |
| 4849 // =4: SAC (O2 usage) from 2nd reading without real_pres_respiration term | |
| 4850 | |
| 4851 // set SAC rate to not available by default | |
| 4852 int_O_SAC_measured = 0 + INT_FLAG_NOT_AVAIL; | |
| 4853 | |
| 4854 // get a copy of the current absolute pressure | |
| 4855 pres_respiration_sac = real_pres_respiration; | |
| 4856 | |
| 4857 // set threshold for SAC rate attention | |
| 628 | 4858 max_sac_rate = (deco_info & DECO_MODE) ? char_I_SAC_deco : char_I_SAC_work; |
| 623 | 4859 |
| 4860 // char_I_SAC_deco / char_I_SAC_work are in l/min, max_sac_rate is in 0.1 l/min | |
| 4861 max_sac_rate *= 10; | |
| 4862 | |
| 4863 | |
| 4864 // pre-process SAC mode 3 (independent double) | |
| 4865 if( char_I_SAC_mode == 3 ) | |
| 560 | 4866 { |
| 623 | 4867 overlay unsigned char reading1_gas; |
| 4868 overlay unsigned char reading2_gas; | |
| 4869 overlay unsigned char reading1_tanksize; | |
| 4870 overlay unsigned char reading2_tanksize; | |
| 4871 overlay unsigned short reading1_press; | |
| 4872 overlay unsigned short reading2_press; | |
| 4873 overlay unsigned short reading1_drop; | |
| 4874 overlay unsigned short reading2_drop; | |
| 4875 | |
| 4876 // get gas numbers (1-10) of both readings | |
| 4877 reading1_gas = char_I_pressure_gas[0]; | |
| 4878 reading2_gas = char_I_pressure_gas[1]; | |
| 4879 | |
| 4880 // default to no SAC calculation | |
| 4881 char_I_SAC_mode = 0; | |
| 4882 | |
| 4883 // clear switch advice by default | |
| 4884 deco_info &= ~IND_DOUBLE_SWITCH_FLAG; | |
| 4885 | |
| 4886 // check if both readings are configured and available | |
| 4887 if( reading1_gas ) | |
| 4888 if( reading2_gas ) | |
| 4889 if( !(int_IO_pressure_value[0] & INT_FLAG_NOT_AVAIL) ) | |
| 4890 if( !(int_IO_pressure_value[1] & INT_FLAG_NOT_AVAIL) ) | |
| 4891 if( !(int_I_pressure_drop[0] & INT_FLAG_NOT_AVAIL) ) | |
| 4892 if( !(int_I_pressure_drop[1] & INT_FLAG_NOT_AVAIL) ) | |
| 560 | 4893 { |
| 623 | 4894 // get tank pressures, stripping flags |
| 4895 reading1_press = int_IO_pressure_value[0] & 0x0FFF; // in 0.1 bar | |
| 4896 reading2_press = int_IO_pressure_value[1] & 0x0FFF; // in 0.1 bar | |
| 4897 | |
| 4898 // get pressure drops as integers, stripping flags and shifting right | |
| 4899 // to avoid an overflow when multiplying with the tank size later on | |
| 4900 reading1_drop = (int_I_pressure_drop[0] & 0x0FFF) >> 2; | |
| 4901 reading2_drop = (int_I_pressure_drop[1] & 0x0FFF) >> 2; | |
| 4902 | |
| 4903 // get tank sizes | |
| 4904 reading1_tanksize = char_I_gas_avail_size[reading1_gas-1]; | |
| 4905 reading2_tanksize = char_I_gas_avail_size[reading2_gas-1]; | |
| 4906 | |
| 4907 // set mode to calculate SAC on the reading with the higher absolute drop | |
| 4908 char_I_SAC_mode = (reading1_drop * reading1_tanksize > reading2_drop * reading2_tanksize) ? 1 : 2; | |
| 4909 | |
| 4910 // compute switch advice if pressure (in 0.1 bar) of tank breathed from is | |
| 4911 // more than char_I_max_pres_diff (in bar) below pressure of the other tank. | |
| 4912 if( char_I_SAC_mode == 1 ) | |
| 4913 { | |
| 4914 // breathing from reading 1, switch advice if pressure on reading 1 lower than on 2 | |
| 4915 if( (reading1_press + 10*char_I_max_pres_diff) <= reading2_press ) | |
| 4916 deco_info |= IND_DOUBLE_SWITCH_FLAG; | |
| 4917 } | |
| 4918 else | |
| 4919 { | |
| 4920 // breathing from reading 2, switch advice if pressure on reading 2 lower than on 1 | |
| 4921 if( (reading2_press + 10*char_I_max_pres_diff) <= reading1_press ) | |
| 4922 deco_info |= IND_DOUBLE_SWITCH_FLAG; | |
| 4923 } | |
| 560 | 4924 } |
| 4925 } | |
| 4926 | |
| 623 | 4927 |
| 4928 // pre-process SAC mode 4 (O2 usage by reading 2) | |
| 4929 if( char_I_SAC_mode == 4 ) | |
| 4930 { | |
| 4931 // O2 usage on CCR is independent from absolute pressure | |
| 4932 pres_respiration_sac = 1.0; | |
| 4933 | |
| 4934 // O2 pressure drop is measured via reading 2 | |
| 4935 char_I_SAC_mode = 2; | |
| 4936 | |
| 4937 // reconfigure max SAC rate to O2 consumption attention threshold | |
| 4938 max_sac_rate = O2_CONSUMPTION_LIMIT_ATTENTION; | |
| 4939 } | |
| 4940 | |
| 4941 | |
| 628 | 4942 // select which pressure reading to log |
| 4943 if( char_I_SAC_mode == 1 ) int_O_tank_pressure = int_IO_pressure_value[0]; | |
| 4944 else if( char_I_SAC_mode == 2 ) int_O_tank_pressure = int_IO_pressure_value[1]; | |
| 4945 else int_O_tank_pressure = 0; | |
| 4946 | |
| 4947 // strip flags | |
| 4948 int_O_tank_pressure &= 0x0FFF; | |
| 4949 | |
| 631 | 4950 // scale to recording format of full bar only |
| 628 | 4951 int_O_tank_pressure /= 10; |
| 4952 | |
| 4953 | |
| 623 | 4954 // calculate SAC - modes 1 & 2 |
| 4955 if( (char_I_SAC_mode == 1) || (char_I_SAC_mode == 2) ) | |
| 560 | 4956 { |
| 623 | 4957 overlay unsigned char reading_index; |
| 4958 overlay unsigned char reading_gas; | |
| 4959 overlay unsigned char reading_tanksize; | |
| 4960 overlay float reading_drop; | |
| 4961 | |
| 4962 // set index: char_I_SAC_mode = 1 -> reading one, index 0 | |
| 4963 // = 2 -> two, 1 | |
| 4964 reading_index = char_I_SAC_mode - 1; | |
| 4965 | |
| 4966 // get gas number (1-10) | |
| 4967 reading_gas = char_I_pressure_gas[reading_index]; | |
| 4968 | |
| 4969 // check if reading is configured and available | |
| 4970 if( reading_gas ) | |
| 4971 if( !(int_I_pressure_drop[reading_index] & INT_FLAG_NOT_AVAIL) ) | |
| 4972 { | |
| 4973 // get tank size (in liter) | |
| 4974 reading_tanksize = char_I_gas_avail_size[reading_gas-1]; | |
| 4975 | |
| 4976 // get pressure drop as float, stripping flags (in 1/5120 bar/sec) | |
| 4977 reading_drop = (float)(int_I_pressure_drop[reading_index] & 0x0FFF); | |
| 4978 | |
| 4979 // check if pressure drop is within range | |
| 4980 if( !(int_I_pressure_drop[reading_index] & INT_FLAG_OUT_OF_RANGE) ) | |
| 4981 { | |
| 4982 // calculate SAC, 10 is factor to have result in 0.1 liter/min | |
| 4983 // 60 is factor for 60 seconds per 1 minute, | |
| 4984 // 5120 accounts for reading_drop being in 1/5120 bar/sec | |
| 4985 // 10*60/5120 = 60/512 = 15/128 | |
| 4986 float_sac = reading_drop * 15/128 * reading_tanksize / pres_respiration_sac; | |
| 4987 | |
| 4988 // limit result to 999 (99.9 liter/min) | |
| 4989 if ( float_sac >= 998.5 ) | |
| 4990 { | |
| 4991 int_O_SAC_measured = 999 + INT_FLAG_ATTENTION; | |
| 4992 } | |
| 4993 else | |
| 4994 { | |
| 4995 // convert float to integer | |
| 4996 int_O_SAC_measured = (unsigned short)(float_sac + 0.5); | |
| 4997 | |
| 4998 // set attention flag if exceeding SAC threshold, but only if pressure drop is not outdated | |
| 4999 if( !(int_I_pressure_drop[reading_index] & INT_FLAG_OUTDATED) ) | |
| 5000 if( int_O_SAC_measured >= max_sac_rate ) | |
| 5001 { | |
| 5002 int_O_SAC_measured |= INT_FLAG_ATTENTION; | |
| 5003 } | |
| 5004 } | |
| 5005 } | |
| 5006 else | |
| 5007 { | |
| 5008 // pressure drop is out of range, so SAC will be set out of range, too | |
| 5009 int_O_SAC_measured = 999 + INT_FLAG_ATTENTION; | |
| 5010 } | |
| 5011 | |
| 5012 // copy outdated flag from int_I_pressure_drop to int_O_SAC_measured | |
| 5013 if( int_I_pressure_drop[reading_index] & INT_FLAG_OUTDATED ) | |
| 5014 { | |
| 5015 int_O_SAC_measured |= INT_FLAG_OUTDATED; | |
| 5016 } | |
| 5017 } | |
| 5018 } | |
| 5019 } | |
| 631 | 5020 #endif // _rx_functions |
| 5021 | |
| 5022 | |
| 5023 #ifdef _cave_mode | |
| 5024 | |
| 5025 ////////////////////////////////////////////////////////////////////////////// | |
| 5026 // read_backtrack_data | |
| 5027 // | |
| 5028 // Gets the data of the next backtracking data set | |
| 5029 // | |
| 5030 // Modified: backtrack_index last current position in backtracking storage | |
| 5031 // | |
| 5032 // Output: backtrack_step_counter number of 1/10 min calculation steps to do on next target depth | |
| 5033 // backtrack_target_depth next target depth | |
| 5034 // | |
| 5035 static void read_backtrack_data(void) | |
| 5036 { | |
| 5037 overlay unsigned char firstround = 1; | |
| 5038 | |
| 5039 | |
| 5040 // load the step counter with the default of ten 1/10 minute steps to go between two depth samples | |
| 5041 backtrack_step_counter = 10; | |
| 5042 | |
| 5043 // repeat until having read the whole data set or having reached the first storage position | |
| 5044 while(backtrack_index) | |
| 5045 { | |
| 5046 // backtracking data recording format: | |
| 5047 // --------------------------------------------------------------------------- | |
| 5048 // 0ddddddd -> datum is a depth recording with d = 0..127 depth in meters | |
| 5049 // 10tttttt -> delta time with t = 0.. 59 time in seconds | |
| 5050 // 110ggggg -> gas staging status with g = 1 gas staged | |
| 5051 // 111nnnnn -> waypoint marker with n = 1.. 31 waypoint number | |
| 5052 // | |
| 5053 // gas availability vector: LSB : gas 1 (and so on) | |
| 5054 // waypoint marker : 1 - 30: user waypoints, last waypoint is turn point | |
| 5055 // : 31: spare for turn point if all 30 waypoints used up | |
| 5056 // : 0: reserved | |
| 5057 | |
| 5058 // read recording entry and then advance (backward direction!) the reading index | |
| 5059 overlay unsigned char datum = char_I_backtrack_storage[backtrack_index--]; | |
| 5060 | |
| 5061 // is it a target depth? | |
| 5062 if( datum < 128 ) | |
| 5063 { | |
| 5064 // YES - assign the target depth | |
| 5065 backtrack_target_depth = datum; | |
| 5066 | |
| 5067 // a depth entry closes a data set, so done with this data set | |
| 5068 return; | |
| 5069 } | |
| 5070 | |
| 5071 // is it a delta time entry? | |
| 5072 else if( datum < 128 + 64 ) | |
| 5073 { | |
| 5074 // YES - When a delta time entry is contained in a data set, the time | |
| 5075 // stored in the delta time entry is the time that has elapsed | |
| 5076 // between storage of the depth that is part of this data set | |
| 5077 // and the previous depth recording. | |
| 5078 // This entry is stored whenever the delta time is shorter than | |
| 5079 // the default 1 minute depth sampling interval time. | |
| 5080 | |
| 5081 // assign the delta time to the step counter: remove entry tag and | |
| 5082 // convert datum from 0..59 seconds to 0..9 steps by integer division | |
| 5083 backtrack_step_counter = (datum - 128) / 6; | |
| 5084 } | |
| 5085 | |
| 5086 // is it a gas staging status entry? | |
| 5087 else if( datum < 128 + 64 + 32 ) | |
| 5088 { | |
| 5089 // YES - extract gas staging status | |
| 5090 overlay unsigned char gas_status = datum - (128 + 64); | |
| 5091 | |
| 5092 // decode and update gas staging status | |
| 5093 // | |
| 5094 // bit set : gas is staged (not available) during next section of backtracking, | |
| 5095 // bit cleared: gas is not staged ( available) during next section of backtracking. | |
| 5096 // | |
| 5097 // bit 0 corresponds to gas 1, ..., bit 4 corresponds to gas 5 | |
| 5098 // | |
| 5099 for( i = 0; i < NUM_GAS; i++ ) | |
| 5100 { | |
| 5101 if ( gas_status & (1 << i) ) deco_gas_type[i] |= GAS_AVAIL_STAGED; // staged | |
| 5102 else deco_gas_type[i] &= ~GAS_AVAIL_STAGED; // not staged | |
| 5103 } | |
| 5104 } | |
| 5105 | |
| 5106 // must be waypoint marker entry then | |
| 5107 else | |
| 5108 { | |
| 5109 // set step counter to zero if first entry read is a waypoint entry | |
| 5110 if( firstround ) backtrack_step_counter = 0; | |
| 5111 } | |
| 5112 | |
| 5113 // first round done | |
| 5114 firstround = 0; | |
| 5115 | |
| 5116 } // while | |
| 5117 | |
| 5118 // first storage position reached, by convention it contains | |
| 5119 // the final target depth which is zero meters aka the surface | |
| 5120 backtrack_target_depth = 0; | |
| 5121 } | |
| 5122 | |
| 5123 #endif // _cave_mode | |
| 5124 | |
| 623 | 5125 |
| 5126 | |
| 5127 ////////////////////////////////////////////////////////////////////////////// | |
| 631 | 5128 // convert_volume_to_pressure |
| 623 | 5129 // |
| 5130 // Converts gas volumes into pressures and sets respective flags | |
| 5131 // | |
| 650 | 5132 // Input: index index of the gas to convert (0-4) |
| 623 | 5133 // gas_volume_need[] needed gas volume in liters |
| 5134 // char_I_gas_avail_pres[] available gas volume in bar | |
| 5135 // char_I_gas_avail_size[] size of the tanks in liters | |
| 5136 // char_I_pressure_gas[] gas configured on reading 1/2 (TR only) | |
| 5137 // | |
| 631 | 5138 // Output: int_O_gas_need_vol[] required gas amount in liters |
| 5139 // int_O_gas_need_pres[] required gas amount in bar, including flags | |
| 623 | 5140 // int_O_pressure_need[] required gas amount for reading 1/2 (TR only) |
| 5141 // | |
| 650 | 5142 static void convert_volume_to_pressure(PARAMETER unsigned char index) |
| 623 | 5143 { |
| 5144 // just to make the code more readable... | |
| 650 | 5145 i = index; |
| 623 | 5146 |
| 5147 if( gas_volume_need[i] >= 65534.5 ) | |
| 5148 { | |
| 5149 int_O_gas_need_vol[i] = 65535; // clip at 65535 liters | |
| 5150 int_O_gas_need_pres[i] = 999 | INT_FLAG_WARNING | INT_FLAG_HIGH; // 999 bar + warning flag + >999 flag | |
| 560 | 5151 } |
| 5152 else | |
| 5153 { | |
| 631 | 5154 // convert gas volume need from float to integer [in liter] |
| 5155 int_O_gas_need_vol[i] = (unsigned short)( gas_volume_need[i] + 0.5 ); | |
| 623 | 5156 |
| 5157 // compute how much pressure in the tank will be needed [in bar] | |
| 631 | 5158 int_O_gas_need_pres[i] = (unsigned short)( gas_volume_need[i] / char_I_gas_avail_size[i] + 0.5 ); |
| 623 | 5159 |
| 5160 // limit result to 999 bar because of display constraints | |
| 5161 if( int_O_gas_need_pres[i] > 999 ) int_O_gas_need_pres[i] = 999 | INT_FLAG_HIGH; | |
| 5162 | |
| 631 | 5163 // set flags for fast evaluation by output routine |
| 5164 if( int_O_gas_need_pres[i] == 0 ) int_O_gas_need_pres[i] |= INT_FLAG_ZERO; | |
| 5165 else | |
| 5166 #ifdef _gas_contingency | |
| 5167 if( main_status & GAS_CONTINGENCY ) | |
| 5168 { | |
| 5169 // take warning and attention computed en-route | |
| 5170 if ( deco_gas_type[i] & GAS_NEED_WARNING ) | |
| 5171 { | |
| 5172 // tag the tank with a warning | |
| 5173 int_O_gas_need_pres[i] |= INT_FLAG_WARNING; | |
| 5174 | |
| 5175 // tag the peer tanks with a warning, too | |
| 5176 for( j = 0; j < NUM_GAS; j++ ) | |
| 5177 { | |
| 5178 if( peer_tank[i] & (1 << j) ) int_O_gas_need_pres[j] |= INT_FLAG_WARNING; | |
| 5179 } | |
| 5180 } | |
| 5181 else if( deco_gas_type[i] & GAS_NEED_ATTENTION ) | |
| 5182 { | |
| 5183 // tag the tank with an attention | |
| 5184 int_O_gas_need_pres[i] |= INT_FLAG_ATTENTION; | |
| 5185 | |
| 5186 // tag the peer tanks with an attention, too | |
| 5187 for( j = 0; j < NUM_GAS; j++ ) | |
| 5188 { | |
| 5189 if( peer_tank[i] & (1 << j) ) int_O_gas_need_pres[j] |= INT_FLAG_ATTENTION; | |
| 5190 } | |
| 5191 } | |
| 5192 } | |
| 5193 else | |
| 5194 #endif | |
| 5195 { | |
| 5196 // compute warning and attention now | |
| 5197 if ( gas_volume_need[i] >= gas_volume_avail[i] ) int_O_gas_need_pres[i] |= INT_FLAG_WARNING; | |
| 5198 else if( gas_volume_need[i] >= gas_volume_atten[i] ) int_O_gas_need_pres[i] |= INT_FLAG_ATTENTION; | |
| 5199 } | |
| 560 | 5200 } |
| 5201 | |
| 631 | 5202 // set invalid flag if there is an overflow in the stops table or calculation took too long |
| 628 | 5203 if( deco_warnings & DECO_WARNING_INCOMPLETE ) int_O_gas_need_pres[i] |= INT_FLAG_INVALID; |
| 560 | 5204 |
| 604 | 5205 #ifdef _rx_functions |
| 5206 // only for OSTC TR model with TR functions enabled | |
| 623 | 5207 if( main_status & TR_FUNCTIONS ) |
| 560 | 5208 { |
| 623 | 5209 // char_I_pressure_gas[] uses gas indexes from 1-10, loop variable i runs from 0 to 4 |
| 631 | 5210 j = i+1; |
| 623 | 5211 |
| 5212 // check if the current gas is configured on pressure reading 1 or 2 | |
| 5213 if( (char_I_pressure_gas[0] == j) || (char_I_pressure_gas[1] == j) ) | |
| 560 | 5214 { |
| 623 | 5215 // get a copy of the required pressure in full bar |
| 5216 overlay unsigned short int_pres_need = int_O_gas_need_pres[i]; | |
| 5217 | |
| 5218 // strip all flags | |
| 5219 int_pres_need &= 1023; | |
| 5220 | |
| 5221 // limit to 400 bar and multiply by 10 to get required pressure in 0.1 bar | |
| 5222 int_pres_need = (int_pres_need > 400) ? 4000 | INT_FLAG_OUT_OF_RANGE : 10 * int_pres_need; | |
| 5223 | |
| 631 | 5224 // tag as not available if there is an overflow in the stops table or calculation took too long |
| 628 | 5225 if( deco_warnings & DECO_WARNING_INCOMPLETE ) int_pres_need |= INT_FLAG_NOT_AVAIL; |
| 623 | 5226 |
| 5227 // copy to reading data (in both readings the same gas could be configured) | |
| 5228 if( char_I_pressure_gas[0] == j ) int_O_pressure_need[0] = int_pres_need; | |
| 5229 if( char_I_pressure_gas[1] == j ) int_O_pressure_need[1] = int_pres_need; | |
| 5230 } | |
| 5231 } // TR functions | |
| 604 | 5232 #endif |
| 0 | 5233 } |
| 5234 | |
| 623 | 5235 |
| 5236 ////////////////////////////////////////////////////////////////////////////// | |
| 5237 // convert the real CNS value to integer | |
| 5238 // | |
| 5239 // Input CNS_fraction_real current CNS value as float | |
| 5240 // | |
| 5241 // Output: int_O_CNS_current current CNS value as integer including flags | |
| 5242 // | |
| 5243 static void convert_cur_CNS_for_display(void) | |
| 5244 { | |
| 5245 // convert to integer | |
| 5246 float_value = CNS_fraction_real; convert_float_to_int(); int_O_CNS_current = int_value; | |
| 5247 | |
| 5248 // set warning & attention flags | |
| 628 | 5249 if ( int_O_CNS_current >= CNS_LIMIT_WARNING ) int_O_CNS_current |= INT_FLAG_WARNING; |
| 5250 else if ( int_O_CNS_current >= CNS_LIMIT_ATTENTION ) int_O_CNS_current |= INT_FLAG_ATTENTION; | |
| 623 | 5251 } |
| 5252 | |
| 5253 | |
| 0 | 5254 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 5255 // convert the simulated CNS value to integer |
| 5256 // | |
| 5257 // Input: CNS_fraction_sim CNS value after predicted ascent in float | |
| 5258 // | |
| 5259 // Output: int_sim_CNS_fraction CNS value after predicted ascent in integer | |
| 5260 // including flags, will be routed to | |
| 5261 // int_O_{normal,alternative}_CNS_fraction | |
| 5262 // | |
| 604 | 5263 static void convert_sim_CNS_for_display(void) |
| 582 | 5264 { |
| 623 | 5265 // convert to integer |
| 5266 float_value = CNS_fraction_sim; convert_float_to_int(); int_sim_CNS_fraction = int_value; | |
| 5267 | |
| 5268 // set warning & attention flags | |
| 628 | 5269 if ( int_sim_CNS_fraction >= CNS_LIMIT_WARNING ) int_sim_CNS_fraction |= INT_FLAG_WARNING; |
| 5270 else if ( int_sim_CNS_fraction >= CNS_LIMIT_ATTENTION ) int_sim_CNS_fraction |= INT_FLAG_ATTENTION; | |
| 604 | 5271 |
| 631 | 5272 // set invalid flag if there is an overflow in the stops table or calculation took too long |
| 628 | 5273 if ( deco_warnings & DECO_WARNING_INCOMPLETE ) int_sim_CNS_fraction |= INT_FLAG_INVALID; |
| 604 | 5274 } |
| 5275 | |
| 623 | 5276 |
| 604 | 5277 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 5278 // convert the saturation value of the leading tissue to integer |
| 5279 // | |
| 5280 // Input lead_supersat saturation of the leading tissue | |
| 5281 // lead_tissue number of the leading tissue | |
| 5282 // char_I_GF_High_percentage GF high factor | |
| 5283 // | |
| 5284 // Output: int_O_lead_supersat saturation of the leading tissue | |
| 5285 // char_O_lead_tissue number of the leading tissue | |
| 5286 // | |
| 5287 // Modified: deco_warnings deco engine warnings vector | |
| 5288 // | |
| 5289 static void convert_sat_for_display(void) | |
| 604 | 5290 { |
| 623 | 5291 // convert supersaturation of the leading tissue to int_O_lead_supersat in % (1.0 = 100%) |
| 604 | 5292 // limit to 255 because of constraints in ghostwriter code |
| 623 | 5293 if ( lead_supersat <= 0.000 ) int_O_lead_supersat = 0; |
| 5294 else if ( lead_supersat > 2.545 ) int_O_lead_supersat = 255; | |
| 5295 else int_O_lead_supersat = (unsigned short)(100 * lead_supersat + 0.5); | |
| 5296 | |
| 5297 // set warning & attention flags | |
| 5298 if( int_O_lead_supersat > 100 ) | |
| 604 | 5299 { |
| 623 | 5300 int_O_lead_supersat |= INT_FLAG_WARNING; // make GF factor shown in red |
| 5301 deco_warnings |= DECO_WARNING_OUTSIDE; // make depth shown in red | |
| 5302 } | |
| 631 | 5303 else if( (char_I_model != 0) && (int_O_lead_supersat > char_I_GF_High_percentage) |
| 5304 || (char_I_model == 0) && (int_O_lead_supersat > 99 ) ) | |
| 623 | 5305 { |
| 5306 int_O_lead_supersat |= INT_FLAG_ATTENTION; // make GF factor shown in yellow | |
| 5307 deco_warnings |= DECO_ATTENTION_OUTSIDE; // make depth shown in yellow | |
| 604 | 5308 } |
| 5309 | |
| 5310 // export also the number of the leading tissue | |
| 623 | 5311 char_O_lead_tissue = lead_tissue; |
| 604 | 5312 } |
| 5313 | |
| 623 | 5314 |
| 604 | 5315 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 5316 // convert the ceiling value to integer |
| 5317 // | |
| 5318 // Input: ceiling minimum depth permitted in float | |
| 5319 // | |
| 628 | 5320 // Output: int_O_ceiling minimum depth permitted in mbar (cm) |
| 623 | 5321 // |
| 5322 // Modified: deco_info deco engine information vector | |
| 5323 // | |
| 604 | 5324 static void convert_ceiling_for_display(void) |
| 5325 { | |
| 5326 // Convert ceiling to int_O_ceiling in mbar relative pressure. | |
| 5327 // Round up to next 10 cm so that the ceiling disappears only | |
| 5328 // when the ceiling limit is really zero. This will coincident | |
| 5329 // with TTS switching back to NDL time. | |
| 628 | 5330 // The +1.5 term figures in the conversion factor of 10.015 m/bar |
| 5331 // which is used inside the deco engine but not outside of it. | |
| 623 | 5332 if ( ceiling <= 0.0 ) int_O_ceiling = 0; |
| 5333 else if ( ceiling > 16.0 ) int_O_ceiling = 16000; | |
| 628 | 5334 else int_O_ceiling = (unsigned short)(ceiling * (1000+1.5) + 9); |
| 604 | 5335 |
| 5336 // set/reset ceiling flag | |
| 623 | 5337 if ( int_O_ceiling ) deco_info |= DECO_CEILING; |
| 5338 else deco_info &= ~DECO_CEILING; | |
| 0 | 5339 } |
| 5340 | |
| 623 | 5341 |
| 0 | 5342 ////////////////////////////////////////////////////////////////////////////// |
| 582 | 5343 // push_tissues_to_vault & pull_tissues_from_vault |
| 5344 // | |
| 5345 // ATTENTION: Do not use from inside the deco engine! | |
| 5346 // The vault is exclusively reserved to back-up and restore the real | |
| 5347 // tissues and related data when entering / leaving simulation mode! | |
| 5348 // | |
| 623 | 5349 // Input/Output: CNS_fraction_real current real CNS value |
| 5350 // char_O_deco_warnings deco engine warnings vector | |
| 5351 // real_pres_tissue_N2[] partial pressure of N2 in real tissues | |
| 5352 // real_pres_tissue_He[] partial pressure of He in real tissues | |
| 5353 // | |
| 5354 // Output: int_O_CNS_current current CNS value as integer including flags | |
| 5355 // | |
| 604 | 5356 static void push_tissues_to_vault(void) |
| 0 | 5357 { |
| 623 | 5358 // store the current CNS value and deco warnings |
| 5359 vault_CNS_fraction_real = CNS_fraction_real; | |
| 5360 vault_deco_warnings = char_O_deco_warnings; | |
| 5361 vault_deco_info = char_O_deco_info; | |
| 5362 | |
| 650 | 5363 // copy the real pressures to the vault |
| 5364 memcpy(vault_pres_tissue_N2, real_pres_tissue_N2, 256); | |
| 0 | 5365 } |
| 5366 | |
| 604 | 5367 static void pull_tissues_from_vault(void) |
| 0 | 5368 { |
| 623 | 5369 // restore the CNS value and deco warnings |
| 5370 CNS_fraction_real = vault_CNS_fraction_real; | |
| 5371 char_O_deco_warnings = vault_deco_warnings; | |
| 5372 char_O_deco_info = vault_deco_info; | |
| 5373 | |
| 5374 // convert the CNS value to integer | |
| 5375 convert_cur_CNS_for_display(); | |
| 5376 | |
| 650 | 5377 // copy the vault back to the real pressures |
| 5378 memcpy(real_pres_tissue_N2, vault_pres_tissue_N2, 256); | |
| 0 | 5379 } |
| 5380 | |
| 623 | 5381 |
| 0 | 5382 ////////////////////////////////////////////////////////////////////////////// |
| 5383 // | |
| 5384 #ifndef CROSS_COMPILE | |
| 5385 void main() {} | |
| 5386 #endif |