Mercurial > public > hwos_code
annotate src/p2_deco.c @ 641:1212d39c9f6f
3.14 beta work
| author | heinrichsweikamp |
|---|---|
| date | Sat, 21 Nov 2020 17:46:29 +0100 |
| parents | 8c1f1f334275 |
| children | 1e695355dfc4 |
| rev | line source |
|---|---|
| 582 | 1 // *************************************************************************** |
| 640 | 2 // p2_deco.c combined next generation V3.12.1 |
| 0 | 3 // |
| 4 // Created on: 12.05.2009 | |
| 560 | 5 // Author: heinrichs weikamp, contributions by Ralph Lembcke and others |
| 0 | 6 // |
| 582 | 7 // *************************************************************************** |
| 0 | 8 |
| 9 ////////////////////////////////////////////////////////////////////////////// | |
| 10 // OSTC - diving computer code | |
| 604 | 11 // Copyright (C) 2018 HeinrichsWeikamp 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). |
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33
5d4a4fb0e8a6
Bugfix: NOAA tables for CNS are in ATA, not bar
heinrichsweikamp
parents:
0
diff
changeset
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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
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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
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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> |
| 582 | 92 #include "p2_definitions.h" |
| 93 #define TEST_MAIN | |
| 94 #include "shared_definitions.h" | |
| 623 | 95 #include "configuration.inc" |
| 0 | 96 |
| 560 | 97 |
| 604 | 98 // ********************************************************************************************************************************* |
| 99 // | |
| 100 // C O N S T A N T S D E F I N I T I O N S | |
| 101 // | |
| 102 // ********************************************************************************************************************************* | |
| 103 | |
| 623 | 104 |
| 105 // deco engine scheduling | |
| 106 #define INVOKES_PER_SECOND 2 // number of invocations of the deco engine per second (use powers of 2 only: 1, 2, 4, ...) | |
| 628 | 107 |
| 108 #ifdef _hwos_sport | |
| 109 #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 | |
| 110 #else | |
| 623 | 111 #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 | 112 #endif |
| 604 | 113 |
| 560 | 114 // ambient pressure at different mountain heights |
| 115 #define P_ambient_1000m 0.880 // [bar] based on 990 hPa and 20°C at sea level, 15°C at altitude | |
| 116 #define P_ambient_2000m 0.782 // [bar] | |
| 117 #define P_ambient_3000m 0.695 // [bar] | |
| 118 | |
| 119 // ambient pressure in aircraft cabin during flying - worst case according to Buhlmann | |
| 120 #define P_ambient_fly 0.600 // [bar], 0.600 bar is the value used by Buhlmann for his flying-after-diving calculations | |
| 582 | 121 // 0.735 bar is a typical cabin pressure for nowadays commercial jet aircrafts |
| 560 | 122 // ----- |
| 123 // 0.135 bar safety margin | |
| 124 | |
| 125 // constants and factors | |
| 631 | 126 #define ppWater 0.06270 // water vapor partial pressure in the lungs |
| 127 #define METER_TO_BAR 0.09807 // conversion factor (1 m water column = 0.09807 bar) | |
| 128 #define BAR_TO_METER 10.19716 // conversion factor (1 bar = 10.19716 m ) | |
| 129 #define SURFACE_DESAT_FACTOR 0.70420 // surface desaturation safety factor | |
| 130 #define HYST 1.0E-06 // threshold for tissue graphics on-gassing / off-gassing visualization | |
| 560 | 131 |
| 132 // thresholds | |
| 628 | 133 #define CNS_LIMIT_WARNING 100 // threshold for CNS warning |
| 134 #define CNS_LIMIT_ATTENTION 70 // threshold for CNS attention | |
| 604 | 135 #define PRESSURE_LIMIT_WARNING 200 // threshold for pressure reading warning : 20.0 bar |
| 136 #define PRESSURE_LIMIT_ATTENTION 500 // threshold for pressure reading attention: 50.0 bar | |
| 631 | 137 #define GAS_NEEDS_ATTENTION 0.7 // threshold for gas needs attention [1 = 100%] |
| 604 | 138 #define O2_CONSUMPTION_LIMIT_ATTENTION 20 // threshold for O2 "SAC" attention: 2.0 l/min |
| 628 | 139 #define ppO2_GAP_TO_SETPOINT 10 // gap between setpoint and max. ppO2 of the pure diluent [cbar] |
| 623 | 140 #define ppO2_MARGIN_ON_MAX 3 // [cbar] margin on ppO2 max to compensate for surface pressures > 1.000 mbar |
| 631 | 141 #define STOP_CHAINING_LIMIT 3 // max. number of chained stop table entries before deco calculation is aborted |
| 628 | 142 |
| 623 | 143 |
| 144 // deco engine states and modes - (char_O_)main_status: controls current tissue and deco status calculation (as-is situation) | |
| 145 #define CALC_VOLUME 0x01 // =1: calculate gas needs | |
| 146 #define CALCULATE_BOTTOM 0x02 // =1: calculate gas needs in deco calculator mode, =0: in dive mode | |
| 631 | 147 #define CAVE_MODE 0x04 // =1: calculate return path and gas needs using backtracking data |
| 148 #define GAS_CONTINGENCY 0x08 // =1: use a second best gas if best gas is all used up | |
| 623 | 149 #define TR_FUNCTIONS 0x10 // =1: calculate TR functions (pressure reading) processing |
| 150 #define EXTENDED_STOPS 0x20 // =1: allow placement of gas switches below the depth of the 1st stop | |
| 151 | |
| 152 #define MODE_MASK 0xC0 // mask for real tissues mode selection | |
| 153 #define MODE_LOOP 0x40 // =1: CCR (MODE_PSCR needs to be cleared) or pSCR mode | |
| 154 #define MODE_CCR 0x40 // to be used with == operator in combination with MODE_MASK only! | |
| 155 #define MODE_PSCR 0x80 // =1: pSCR mode (MODE_LOOP needs to be set, too) | |
| 156 | |
| 157 // deco engine states and modes - (char_O_)deco_status: controls deco plan calculation (to-be scenario) | |
| 158 #define PLAN_MASK 0x03 // bit mask covering normal & alternative plan flag | |
| 159 #define COMMAND_MASK 0x07 // bit mask covering all command flags | |
| 160 #define CALCULATING 0x00 // calculations are ongoing | |
| 161 #define START_NORM 0x01 // input: start calculation of a normal deco plan | |
| 162 #define CALC_NORM 0x01 // internal: calculating a normal deco plan | |
| 163 #define COMPLETED_NORM 0x01 // output: calculation of a normal deco plan has completed | |
| 164 #define START_ALT 0x02 // input: start calculation of an alternative deco plan | |
| 165 #define CALC_ALT 0x02 // internal: calculating an alternative deco plan | |
| 166 #define COMPLETED_ALT 0x02 // output: calculation of an alternative deco plan has completed | |
| 167 #define INITIALIZE 0x04 // input: initialize deco engine | |
| 631 | 168 #define INITIALIZE_START_NORM 0x05 // input: initialize deco engine and start calculation of a normal deco plan |
| 623 | 169 #define INITIALIZE_START_ALT 0x06 // input: initialize deco engine and start calculation of an alternative deco plan |
| 628 | 170 #define DECO_CALCULATOR_MODE 0x08 // input: deco engine is run from deco calculator |
| 623 | 171 |
| 172 #define BAILOUT_MODE 0x10 // =1: allow gas switches before first deco stop | |
| 631 | 173 #define DELAYED_ASCENT 0x20 // =1: figure in a delayed ascent / delayed turn of the dive (fTTS) |
| 623 | 174 |
| 175 // MODE_MASK 0xC0 // mask for simulated tissues mode selection | |
| 176 // MODE_LOOP 0x40 // =1: CCR (MODE_PSCR needs to be cleared) or pSCR mode | |
| 177 // MODE_CCR 0x40 // to be used with == operator in combination with MODE_MASK only! | |
| 178 // MODE_PSCR 0x80 // =1: pSCR mode (MODE_LOOP needs to be set, too) | |
| 179 | |
| 180 | |
| 181 // deco engine warnings - (char_O_)deco_warnings | |
| 604 | 182 #define DECO_WARNING_IBCD 0x01 // IBCD occurring now |
| 183 #define DECO_WARNING_IBCD_lock 0x02 // IBCD has occurred during the dive | |
| 184 #define DECO_WARNING_MBUBBLES 0x04 // micro bubbles likely to develop now | |
| 185 #define DECO_WARNING_MBUBBLES_lock 0x08 // ditto, but sometime during the dive | |
| 186 #define DECO_WARNING_OUTSIDE 0x10 // tissue pressures outside the Buhlmann model now | |
| 187 #define DECO_WARNING_OUTSIDE_lock 0x20 // tissue pressures outside the model sometime during the dive | |
| 188 #define DECO_ATTENTION_OUTSIDE 0x40 // tissue pressures are very close to the Buhlmann limit | |
| 631 | 189 #define DECO_WARNING_INCOMPLETE 0x80 // deco calculation incomplete due to too long compute time |
| 604 | 190 |
| 623 | 191 // deco engine status (char_O_)deco_info |
| 628 | 192 #define DECO_MODE 0x01 // =1: deco ppO2 levels are permitted |
| 604 | 193 #define IND_DOUBLE_SWITCH_FLAG 0x02 // =1: switch to other tank advice active |
| 631 | 194 #define GAS_NEEDS_fTTS 0x04 // =1: gas needs are calculated in fTTS mode |
| 623 | 195 #define DECO_ZONE 0x08 // =1: fTTS < TTS (not updated when in bailout mode) |
| 631 | 196 #define DECO_CEILING 0x10 // =1: deco obligation (ceiling > 0) |
| 197 #define DECO_STOPS_NORM 0x20 // =1: deco stops found in normal plan | |
| 198 #define DECO_STOPS_ALT 0x40 // =1: deco stops found in alternative plan | |
| 199 #define GAS_NEEDS_CAVE 0x80 // =1: indicated gas needs are calculated in cave mode | |
| 623 | 200 |
| 604 | 201 |
| 202 // deco engine control - tissue_increment | |
| 631 | 203 #define TIME_MASK 0x7F // =0: time increment is 2 or 6 seconds, 1..127: time increments is 1..127 minutes |
| 204 #define TISSUE_SELECTOR 0x80 // =0: calculate on simulated tissues, 1 : calculate on real tissues | |
| 623 | 205 |
| 206 | |
| 207 // deco engine control - next_planning_phase | |
| 208 #define PHASE_00_DONE 0x00 // calculation cycle finished | |
| 209 #define PHASE_10_DIVE_INIT 0x10 // once-per-dive initialization of the deco engine | |
| 628 | 210 #define PHASE_20_CYCLIC_INIT 0x20 // once-every-cycle initialization of the deco engine |
| 211 #define PHASE_30_EXTENDED_BOTTOM_TIME 0x30 // calculate extended bottom time | |
| 212 #define PHASE_40_BOTTOM_GAS_NEED 0x40 // calculate gas needs for bottom segment | |
| 213 #define PHASE_50_NDL_TIME 0x50 // calculate NDL time | |
| 631 | 214 #define PHASE_70_ASCENT_OR_RETURN 0x70 // calculate open water ascent or cave return |
| 628 | 215 #define PHASE_80_RESULTS 0x80 // results - initialization |
| 216 #define PHASE_81_RESULTS_STOPS_TABLE 0x81 // results - publish stops table | |
| 217 #define PHASE_82_RESULTS_NDL 0x82 // results - publish data / within NDL | |
| 218 #define PHASE_83_RESULTS_DECO 0x83 // results - publish data / in deco | |
| 219 #define PHASE_84_GAS_NEEDS_PRESSURES 0x84 // results - convert gas needs from volumes to pressures | |
| 631 | 220 #define PHASE_85_GAS_NEEDS_CAVE 0x85 // results - tag gas needs as calculated in cave or open water mode |
| 623 | 221 #define PHASE_90_FINISH 0x90 // finish calculation cycle |
| 222 | |
| 223 | |
| 631 | 224 // gas & diluent - type and availability state |
| 225 // 0x01 // | 0: disabled, 1: first, 2: normal/work, 3: deco | |
| 226 // 0x02 // | | |
| 227 #define GAS_TYPE_MASK 0x03 // bit mask covering the type enumerator | |
| 228 #define GAS_AVAIL_LOST 0x04 // =1: gas/diluent lost flag (permanently unavailable) | |
| 229 #define GAS_AVAIL_STAGED 0x08 // =1: gas/diluent staged flag (temporary unavailable) | |
| 230 #define GAS_AVAIL_MASK 0x0C // bit mask covering the availability flags | |
| 231 #define GAS_NEED_ATTENTION 0x10 // =1: gas need >= attention threshold | |
| 232 #define GAS_NEED_WARNING 0x20 // =1: gas need >= warning threshold | |
| 233 #define GAS_NEED_MASK 0x30 // bit mask covering the need flags | |
| 234 #define GAS_NEARLY_USED_UP 0x40 // =1: the gas is nearly used up (= at attention threshold) | |
| 235 #define GAS_FULLY_USED_UP 0x80 // =1: the gas is fully used up (= at warning threshold) | |
| 236 | |
| 237 | |
| 560 | 238 // flags used with integer numbers |
| 604 | 239 #define INT_FLAG_INVALID 0x0400 // =1: value not valid |
| 623 | 240 #define INT_FLAG_NOT_COMPUTED_YET 0x0800 // =1: value not computed yet |
| 604 | 241 #define INT_FLAG_ZERO 0x0800 // =1: value is zero |
| 242 #define INT_FLAG_LOW 0x1000 // =1: value is below a lower warning threshold | |
| 243 #define INT_FLAG_NOT_AVAIL 0x1000 // =1: value is not available (not computed) | |
| 244 #define INT_FLAG_HIGH 0x2000 // =1: value is above an upper warning threshold | |
| 245 #define INT_FLAG_OUTDATED 0x2000 // =1: value has not been updated for too long | |
| 246 #define INT_FLAG_ATTENTION 0x4000 // =1: value exceeds the attention threshold | |
| 247 #define INT_FLAG_WARNING 0x8000 // =1: value exceeds the warning threshold | |
| 248 #define INT_FLAG_OUT_OF_RANGE 0x8000 // =1: value exceeds presentable range | |
| 249 | |
| 250 | |
| 251 | |
| 252 // ********************************************************************************************************************************* | |
| 253 // | |
| 254 // ** P R O T O T Y P E S ** | |
| 255 // | |
| 256 // The Functions are listed in sequence of intended usage / application. | |
| 257 // | |
| 258 // ********************************************************************************************************************************* | |
| 259 | |
| 623 | 260 // Functions used in Surface Mode |
| 604 | 261 static void calc_interval(PARAMETER unsigned char time_increment); |
| 262 // Calculates the tissue off-gassing under surface conditions. | |
| 263 static void calc_desaturation_time(void); // Calculates the desaturation and no-fly times. | |
| 264 static void clear_tissue(void); // Resets all tissues to surface pressure equilibrium state. | |
| 623 | 265 static void init_output_vars(void); // Initializes all deco engine output variables to defaults |
| 266 | |
| 267 // Main entry point in Dive Mode | |
| 604 | 268 static void calc_hauptroutine(void); // Sequences all calculations for the real tissues and the deco calculation. |
| 269 | |
| 623 | 270 // Functions dedicated to the real Tissues |
| 604 | 271 static void calc_hauptroutine_data_input(void);// Initializes environment data and sets gas ratios for the real tissues. |
| 272 | |
| 623 | 273 // Functions combined for real Tissues & Deco Calculations |
| 604 | 274 static void calc_alveolar_pressures(void); // Computes the partial pressures from the gas ratios and many more parameters, |
| 275 // needs either calc_hauptroutine_data_input() be called beforehand or | |
| 628 | 276 // gas_take_current() or gas_find_best()/gas_take_best() and gas_set_ratios(). |
| 604 | 277 static void calc_tissues(void); // Updates the tissues dependent on the partial pressures of N2 and He. |
| 278 static void calc_CNS(void); // Updates the CNS value dependent on the partial pressure of the O2. | |
| 279 static void calc_limit(PARAMETER float GF_current); | |
| 631 | 280 // Calculates ceiling, current supersaturation factor and some more data. |
| 604 | 281 |
| 623 | 282 // Functions for TR |
| 283 #ifdef _rx_functions | |
| 284 static void calc_TR_functions(void); // Calculates SAC etc. | |
| 285 #endif | |
| 286 | |
| 631 | 287 // Functions for Cave Mode |
| 288 #ifdef _cave_mode | |
| 289 static void read_backtrack_data(void); // Gets the data of the next backtracking data set | |
| 290 #endif | |
| 291 | |
| 623 | 292 // Functions dedicated to Deco Calculations |
| 604 | 293 static void clear_deco_table(void); // Clears the deco stops table, invoked at the start of each calculation cycle. |
| 631 | 294 static void gas_take_current(void); // Take the actual currently used gas for ascent & deco calculation |
| 628 | 295 static unsigned char gas_find_best(void); // Searches for the best gas available. |
| 296 static void gas_take_best(void); // Switches to the best gas that has been found found before by gas_find_best(). | |
| 604 | 297 static void gas_set_ratios(void); // Sets the gas ratios for use in deco calculation (simulated tissues), |
| 628 | 298 // needs to be called after each gas change (gas_take_current/_better). |
| 623 | 299 static void calc_NDL_time_tissue(void); // Calculates the remaining NDL time for a given tissue. |
| 300 static unsigned char find_next_stop(void); // Finds the next stop when in a deco ascent. | |
| 631 | 301 static void update_deco_table(PARAMETER unsigned char time_increment); |
| 604 | 302 // Enters a new stop or extends an existing stop in the deco stops table. |
| 631 | 303 static void calc_required_volume(void); // Calculates gas volume required for a given depth, time and usage (SAC rate). |
| 304 static void convert_volume_to_pressure(void); // Converts gas volumes into pressures and sets respective flags. | |
| 623 | 305 |
| 306 // Functions for Results Reporting | |
| 604 | 307 static void publish_deco_table(void); // Copies the internal deco stops table to the export interface. |
| 623 | 308 static void convert_cur_CNS_for_display(void); // Converts the current CNS value from float to integer. |
| 604 | 309 static void convert_sim_CNS_for_display(void); // Converts the end-of-dive CNS value from float to integer. |
| 623 | 310 static void convert_sat_for_display(void); // Converts leading tissue saturation value from float to integer, 1.0 = 100%. |
| 604 | 311 static void convert_ceiling_for_display(void); // Converts ceiling from float to integer in mbar relative pressure. |
| 312 | |
| 313 | |
| 623 | 314 // internal helper Functions |
| 315 static void load_tmr5(void); // Loads a hardware timer which is used for preemptive scheduling. | |
| 316 static void read_tmr5(void); // Reads a hardware timer which is used for preemptive scheduling. | |
| 317 static void read_CNS_ab_coefficient(void); // Reads the CNS a and b coefficients from a ROM table. | |
| 318 static void read_CNS_c_coefficient(void); // Reads the CNS c coefficient from a ROM table. | |
| 319 static void read_Buhlmann_coefficients(void); // Reads the Buhlmann a and b coefficients from a ROM table. | |
| 604 | 320 static void read_Buhlmann_times(PARAMETER char period); |
| 321 // Reads pre-computed tissue increment factors from a ROM table. | |
| 322 static void read_Buhlmann_ht(void); // Reads the half-times from a ROM table. | |
| 323 static void adopt_Buhlmann_coefficients(void); // Computes average a and b coefficient by the N2/He tissue ratio. | |
| 324 static void push_tissues_to_vault(void); // Stores the state of the real tissues during simulator runs. | |
| 325 static void pull_tissues_from_vault(void); // Restores the state of the real tissues after a simulator run. | |
| 628 | 326 static void calc_N2_equilibrium(void); // Calculate partial pressure of N2 in respired air at surface pressure. |
| 327 static void get_saturation_factors(void); // Get, safeguard and convert the saturation and desaturation factors. | |
| 328 static void apply_saturation_factors(void); // Applies saturation and desaturation factors. | |
| 604 | 329 |
| 330 | |
| 331 // ********************************************************************************************************************************* | |
| 332 // | |
| 333 // V A R I A B L E S D E F I N I T I O N S | |
| 334 // | |
| 335 // ********************************************************************************************************************************* | |
| 0 | 336 |
| 337 //---- Bank 5 parameters ----------------------------------------------------- | |
| 338 #ifndef UNIX | |
| 339 # pragma udata bank5=0x500 | |
| 340 #endif | |
| 341 | |
| 631 | 342 // Data that go into the deco data vault (4 byte) |
| 343 | |
| 344 static float CNS_fraction_real; // || current real CNS (1.00 = 100%) | |
| 345 | |
| 346 | |
| 347 // Environmental and Gas Data (51 byte) | |
| 560 | 348 |
| 582 | 349 static float pres_surface; // absolute pressure at the surface |
| 560 | 350 |
| 628 | 351 static float float_depth_real; // current real depth in meters, float |
| 352 static unsigned char char_depth_real; // current real depth in meters, integer | |
| 631 | 353 static unsigned char char_depth_start; // start value of simulated depth in meters, integer |
| 628 | 354 static unsigned char char_depth_sim; // current value of simulated depth in meters, integer |
| 604 | 355 |
| 356 static float real_pres_respiration; // current real depth in absolute pressure | |
| 357 static float real_O2_ratio; // real breathed gas oxygen ratio | |
| 358 static float real_N2_ratio; // real breathed gas nitrogen ratio | |
| 359 static float real_He_ratio; // real breathed gas helium ratio | |
| 360 static float real_pSCR_drop; // real ppO2 drop in pSCR loop | |
| 582 | 361 |
| 362 static float sim_pres_respiration; // simulated current depth in abs.pressure, used for deco calculations | |
| 363 static float sim_O2_ratio; // simulated breathed gas oxygen ratio | |
| 364 static float sim_N2_ratio; // simulated breathed gas nitrogen ratio | |
| 365 static float sim_He_ratio; // simulated breathed gas helium ratio | |
| 366 static float sim_pSCR_drop; // simulated ppO2 drop in pSCR loop | |
| 560 | 367 |
| 604 | 368 |
| 631 | 369 // general Deco Parameters (64 byte) |
| 623 | 370 |
| 371 static float GF_low; // gradient factor to determine 1st stop | |
| 372 static float GF_high; // gradient factor to determine surfacing | |
| 373 | |
| 631 | 374 static unsigned char GF_low_last; // last GF low, used to detect a GF change |
| 375 static unsigned char GF_high_last; // last GF high, used to detect a GF change | |
| 376 | |
| 377 static unsigned char GF_depth; // GF low reference depth in current calculation cycle | |
| 378 static unsigned char GF_depth_norm; // GF low reference depth in normal plan | |
| 379 static unsigned char GF_depth_alt; // GF low reference depth in alternative plan | |
| 380 | |
| 381 static float GF_slope; // (GF_high - GF_low) / GF_depth in current calculation cycle | |
| 382 static float GF_slope_norm; // (GF_high - GF_low) / GF_depth_norm in normal plan | |
| 383 static float GF_slope_alt; // (GF_high - GF_low) / GF_depth_alt in alternative plan | |
| 384 | |
| 623 | 385 static float float_saturation_multiplier; // safety factor for on-gassing rates |
| 386 static float float_desaturation_multiplier; // safety factor for off-gassing rates | |
| 387 | |
| 388 static unsigned char split_N2_He[NUM_COMP]; // used for calculating the desaturation time | |
| 631 | 389 static unsigned char deco_gas_type[NUM_GAS]; // type and state of the deco gases |
| 390 static unsigned char peer_tank[NUM_GAS]; // bit flag vector indicating peer tanks holding same gas | |
| 391 | |
| 392 | |
| 393 // real Context: what we are doing now (12 byte) | |
| 394 | |
| 623 | 395 static unsigned short IBCD_tissue_vector; // 16 bit vector to memorize all tissues that experience IBCD |
| 396 | |
| 397 static float pres_respiration_sac; // used in SAC calculation: current depth in absolute pressure | |
| 398 static float float_sac; // used in SAC calculation: SAC value in float | |
| 399 static unsigned short max_sac_rate; // used in SAC calculation: threshold for SAC rate attention | |
| 400 | |
| 401 | |
| 402 // simulated Context: used to calculate Ascent (11 byte) | |
| 403 | |
| 404 static float CNS_fraction_sim; // CNS after predicted ascent, 0.01 = 1%, as float | |
| 405 static unsigned short int_sim_CNS_fraction; // CNS after predicted ascent, 1 = 1%, as integer | |
| 406 static unsigned char NDL_tissue_start_norm; // tissue to start with when calculating the normal NDL time | |
| 407 static unsigned char NDL_tissue_start_alt; // tissue to start with when calculating the alternative NDL time | |
| 408 static unsigned char NDL_tissue_start; // tissue to start with in current cycle | |
| 409 static unsigned char NDL_tissue_lead; // tissue with the shortest NDL time found in current cycle | |
| 410 static unsigned char NDL_tissue; // tissue for which the NDL is calculated right now | |
| 411 | |
| 628 | 412 |
| 623 | 413 // Result Values from Calculation Functions (9 byte) |
| 414 | |
| 415 static float ceiling; // minimum tolerated relative pressure (i.e. without surface pressure) | |
| 416 static float lead_supersat; // supersaturation of the leading tissue, 1.0 = 100% | |
| 631 | 417 static unsigned char lead_tissue; // number of the leading tissue (0-15) |
| 623 | 418 |
| 419 | |
| 420 // Transfer Variables between calc_desaturation_time() and calc_desaturation_time_helper() (18 byte) | |
| 421 | |
| 422 static float desat_factor; // used to cache a pre-computed factor | |
| 631 | 423 static float var_ht; // half-time factor for the compartment |
| 424 static float pres_target; // target pressure for the compartment | |
| 425 static float pres_actual; // current pressure of the compartment | |
| 623 | 426 static unsigned short int_time; // time it takes for the compartment to reach the target pressure |
| 427 | |
| 428 | |
| 631 | 429 // Gas in Use and Gas Needs (67 byte) |
| 430 | |
| 431 static unsigned char start_gas_num; // number of the gas/dil to start with | |
| 628 | 432 |
| 433 static unsigned char sim_gas_last_num; // number of the last used gas | |
| 623 | 434 static unsigned char sim_gas_current_num; // number of the currently used gas |
| 435 static unsigned char sim_gas_current_depth; // change depth of the currently used gas | |
| 436 | |
| 631 | 437 static unsigned char sim_gas_best_num; // number of the best gas available |
| 438 static unsigned char sim_gas_best_depth; // change depth of the best gas available | |
| 628 | 439 |
| 623 | 440 static unsigned char gas_needs_gas_index; // index to the gas and tank data arrays |
| 631 | 441 static float gas_volume_need[NUM_GAS]; // gas volumes required for ascent / cave return in liters |
| 442 static float gas_volume_avail[NUM_GAS]; // gas volumes available for ascent / cave return in liters | |
| 443 static float gas_volume_atten[NUM_GAS]; // attention threshold for gas volumes available | |
| 444 | |
| 445 | |
| 446 // Transfer Variables for calc_required_volume() (7 byte) | |
| 628 | 447 |
| 448 static unsigned char gas_needs_depth; // depth of the stop or half-way point | |
| 631 | 449 static unsigned char gas_needs_time; // duration of the stop, ascent or travel phase |
| 628 | 450 static unsigned char gas_needs_usage_rate; // gas usage in l/min |
| 631 | 451 static float gas_needs_volume_due; // computed amount of required gas volume |
| 452 | |
| 453 | |
| 454 // 243 byte used, 13 byte left in this bank (4 bytes per float, 2 bytes per short, 1 byte per char) | |
| 455 | |
| 456 | |
| 457 //---- Bank 6 parameters ----------------------------------------------------- | |
| 458 #ifndef UNIX | |
| 459 # pragma udata bank6=0x600 | |
| 460 #endif | |
| 461 | |
| 462 // Timer5 Interface (3 byte) - Attention: keep order and keep at beginning of bank 6, i.e. at address 0x600 ! | |
| 463 | |
| 464 static volatile unsigned short tmr5_value; // | timer 5 value buffer MUST be at address 0x600 | |
| 465 static volatile unsigned char tmr5_overflow; // | timer 5 overflow flag MUST be at address 0x602 | |
| 466 | |
| 467 | |
| 468 // Modes, Sequencing and Indexing (14 byte) | |
| 469 | |
| 470 static unsigned char main_status; // shadow register for char_O_main_status | |
| 471 static unsigned char deco_status; // shadow register for char_O_deco_status | |
| 472 static unsigned char deco_info; // shadow register for char_O_deco_info | |
| 473 static unsigned char deco_warnings; // shadow register for char_O_deco_warnings | |
| 474 static unsigned char next_planning_phase; // next calculation phase to be executed | |
| 475 static unsigned char tissue_increment; // selector for real/simulated tissues and time increment | |
| 476 static unsigned char sequence_timer; // timer to sequence deco engine tasks | |
| 477 static unsigned char ci; // index to the Buhlmann tables (compartment index) | |
| 478 static unsigned char cns_i; // index to the CNS tables (ppO2 range index) | |
| 479 static unsigned char i; // general purpose loop counter and index | |
| 480 static unsigned char j; // general purpose loop counter and index | |
| 481 static unsigned char stop_index; // current stop table position | |
| 482 static unsigned char chained_stops; // counter for chained stop entries | |
| 483 static unsigned char backtrack_index; // index into the depth backtracking array char_I_backtrack_storage | |
| 484 static unsigned char backtrack_target_depth; // current backtracking target depth | |
| 485 static unsigned char backtrack_step_counter; // counter for number of 1/10 minute steps done | |
| 486 | |
| 487 | |
| 488 // Result Values from Calculation Functions (28 byte) | |
| 489 | |
| 490 static float ppO2_O2; // ppO2 calculated for breathing pure oxygen in OC mode | |
| 491 static float ppO2_OC; // ppO2 calculated for breathing current gas in OC mode | |
| 492 static float ppO2_pSCR; // ppO2 calculated for breathing current gas in pSCR mode | |
| 493 | |
| 494 static float ppO2; // partial pressure of breathed oxygen | |
| 495 static float ppN2; // partial pressure of breathed nitrogen | |
| 496 static float ppHe; // partial pressure of breathed helium | |
| 497 | |
| 498 static unsigned char char_ppO2; // partial pressure of breathed oxygen, 100 = 1.00 bar | |
| 499 static unsigned char NDL_time; // time in full minutes until reaching no-deco limit (NDL) | |
| 500 static unsigned short TTS_time; // time in 1/10 minutes until finishing ascent / cave return | |
| 501 static unsigned short TST_time; // time in full minutes of all stops in ascent / cave return | |
| 502 | |
| 503 | |
| 504 // Buhlmann Model Parameters (40 byte) | |
| 505 | |
| 506 static float var_N2_a; // Buhlmann a for current N2 tissue | |
| 507 static float var_N2_b; // Buhlmann b for current N2 tissue | |
| 508 static float var_He_a; // Buhlmann a for current He tissue | |
| 509 static float var_He_b; // Buhlmann b for current He tissue | |
| 510 static float var_a; // Buhlmann a adopted to current N2/He ratio | |
| 511 static float var_b; // Buhlmann b adopted to current N2/He ratio | |
| 512 static float var_N2_e; // exposition for current N2 tissue | |
| 513 static float var_He_e; // exposition for current He tissue | |
| 514 static float var_N2_ht; // half-time for current N2 tissue | |
| 515 static float var_He_ht; // half-time for current He tissue | |
| 516 | |
| 517 | |
| 518 // CNS Coefficients (10 byte) | |
| 519 | |
| 520 static float var_cns_gain; // two coefficients approximation, gain | |
| 521 static float var_cns_offset; // two coefficients approximation, offset | |
| 522 static unsigned short var_cns_value; // one coefficient approximation, value | |
| 623 | 523 |
| 524 | |
| 525 // Auxiliary Variables for Data Buffering (28 byte) | |
| 526 | |
| 527 static float N2_equilibrium; // used for N2 tissue graphics scaling | |
| 528 static float temp_tissue; // auxiliary variable to buffer tissue pressures | |
| 529 static float float_pSCR_factor; // pre-computed factor for pSCR ppO2 drop calculation | |
| 530 static float calc_pres_tissue_N2; // auxiliary variable to buffer tissue N2 pressure | |
| 531 static float calc_pres_tissue_He; // auxiliary variable to buffer tissue He pressure | |
| 532 static float pres_tissue; // auxiliary variable to buffer total tissue pressure | |
| 533 static float old_pres_respiration; // auxiliary variable to buffer sim_pres_respiration | |
| 534 | |
| 535 | |
| 631 | 536 // Transfer Values for convert_float_to_int() (6 byte) |
| 628 | 537 |
| 538 static float float_value; // input value, float | |
| 539 static unsigned short int_value; // output value, 16 bit | |
| 540 | |
| 541 | |
| 542 // Performance Profiling (4 byte) | |
| 543 | |
| 544 static unsigned short profiling_runtime; // performance measurement: runtime of current invocation | |
| 545 static unsigned char profiling_runs; // performance measurement: invocations per deco calculation cycle | |
| 546 static unsigned char profiling_phase; // performance measurement: current calculation phase | |
| 547 | |
| 548 | |
| 623 | 549 // 7 byte occupied by compiler-placed vars |
| 550 | |
| 551 | |
| 631 | 552 // 139 byte used, 117 byte left in this bank (4 bytes per float, 2 bytes per short, 1 byte per char) |
| 623 | 553 |
| 554 | |
| 555 | |
| 556 //---- Bank 12 parameters ----------------------------------------------------- | |
| 557 #ifndef UNIX | |
| 558 # pragma udata bank12=0xc00 | |
| 559 #endif | |
| 560 | |
| 561 // stops table (96 byte) | |
| 562 | |
| 563 static unsigned char internal_deco_depth[NUM_STOPS]; // depths of the stops in meters | |
| 564 static unsigned char internal_deco_time[NUM_STOPS]; // durations of the stops in minutes | |
| 565 static unsigned char internal_deco_gas[NUM_STOPS]; // gases used on the stops (0 / 1-5) | |
| 566 | |
| 567 | |
| 631 | 568 // Vault to back-up & restore Tissue related Data (134 byte) |
| 569 | |
| 570 static float vault_pres_tissue_N2[NUM_COMP]; // stores the nitrogen tissue pressures | |
| 571 static float vault_pres_tissue_He[NUM_COMP]; // stores the helium tissue pressures | |
| 572 static float vault_CNS_fraction_real; // stores CNS percentage (1.0 = 100%) | |
| 573 static unsigned char vault_deco_warnings; // stores warnings status | |
| 574 static unsigned char vault_deco_info; // stores info status | |
| 575 | |
| 576 // 230 byte used, 26 byte left in this bank (4 bytes per float, 2 bytes per short, 1 byte per char) | |
| 560 | 577 |
| 0 | 578 |
| 579 //---- Bank 7 parameters ----------------------------------------------------- | |
| 580 #ifndef UNIX | |
| 581 # pragma udata bank7=0x700 | |
| 582 #endif | |
| 560 | 583 |
| 623 | 584 // Keep order and position of the variables in bank 7 as they are backed-up to & restored from EEPROM |
| 585 | |
| 586 static float real_pres_tissue_N2[NUM_COMP]; // 16 floats = 64 bytes | |
| 587 static float real_pres_tissue_He[NUM_COMP]; // 16 floats = 64 bytes | |
| 588 | |
| 589 static float sim_pres_tissue_N2[NUM_COMP]; // 16 floats = 64 bytes | |
| 590 static float sim_pres_tissue_He[NUM_COMP]; // 16 floats = 64 bytes | |
| 591 | |
| 592 // 256 byte used, bank is full | |
| 582 | 593 |
| 0 | 594 |
| 595 //---- Bank 8 parameters ----------------------------------------------------- | |
| 596 #ifndef UNIX | |
| 597 # pragma udata overlay bank8=0x800 | |
| 560 | 598 |
| 604 | 599 static char md_pi_subst[256]; // overlay C-code data stack here, too |
| 560 | 600 |
| 601 # define C_STACK md_pi_subst | |
| 0 | 602 #endif |
| 603 | |
| 582 | 604 |
| 0 | 605 // Back to bank6 for further tmp data |
| 582 | 606 // Do not delete this assignment, it is needed by the compiler/linker. |
| 0 | 607 #ifndef UNIX |
| 608 # pragma udata bank6 | |
| 609 #endif | |
| 610 | |
| 582 | 611 |
| 604 | 612 // ********************************************************************************************************************************* |
| 613 // | |
| 614 // L O O K - U P T A B L E S | |
| 615 // | |
| 616 // ********************************************************************************************************************************* | |
| 582 | 617 |
| 0 | 618 #ifndef UNIX |
| 631 | 619 # pragma romdata Buhlmann_ht = 0x1DC00 // needs to be in the UPPER bank |
| 620 #endif | |
| 621 | |
| 622 rom const float Buhlmann_ht[2*16] = { | |
| 623 // Compartment half-times, in minutes | |
| 624 //--- N2 ---- He ---------------------- | |
| 625 4.0, 1.51, | |
| 626 8.0, 3.02, | |
| 627 12.5, 4.72, | |
| 628 18.5, 6.99, | |
| 629 27.0, 10.21, | |
| 630 38.3, 14.48, | |
| 631 54.3, 20.53, | |
| 632 77.0, 29.11, | |
| 633 109.0, 41.20, | |
| 634 146.0, 55.19, | |
| 635 187.0, 70.69, | |
| 636 239.0, 90.34, | |
| 637 305.0, 115.29, | |
| 638 390.0, 147.42, | |
| 639 498.0, 188.24, | |
| 640 635.0, 240.03 | |
| 641 }; | |
| 642 | |
| 643 | |
| 644 #ifndef UNIX | |
| 623 | 645 # pragma romdata CNS_tables = 0x1DC80 // needs to be in the UPPER bank |
| 646 #endif | |
| 647 | |
| 631 | 648 rom const float CNS_2_approx[2*11] = { |
| 649 // 2 coefficient approximation for ppO2 = 51 ... 160 cbar | |
| 650 // CNS increment per 2 sec = 1 / (gain*ppO2 + offset) with ppO2 in [cbar] | |
| 651 // gain offset for ppO2 cbar range | |
| 623 | 652 -533.07, 54000, // 51 - 60 (index 0) |
| 653 -444.22, 48600, // 61 - 70 (index 1) | |
| 654 -355.38, 42300, // 71 - 80 (index 2) | |
| 655 -266.53, 35100, // 81 - 90 (index 3) | |
| 656 -177.69, 27000, // 91 - 100 (index 4) | |
| 657 -177.69, 27000, // 101 - 110 (index 5) | |
| 658 -88.84, 17100, // 111 - 120 (index 6) | |
| 659 -88.84, 17100, // 121 - 130 (index 7) | |
| 660 -88.84, 17100, // 131 - 140 (index 8) | |
| 661 -88.84, 17100, // 141 - 150 (index 9) | |
| 662 -222.11, 37350 // 151 - 160 (index 10) | |
| 663 }; | |
| 664 | |
| 631 | 665 rom const unsigned short CNS_1_approx[1*18] = { |
| 666 // 1 coefficient approximation for ppO2 = 161 ... 250 cbar | |
| 667 // CNS increment per 2 sec = c / 100000.0 | |
| 668 // value in [1/100000] for ppO2 cbar range | |
| 623 | 669 75, // 161 - 165 (index 0) |
| 670 102, // 166 - 170 (index 1) | |
| 671 136, // 171 - 175 (index 2) | |
| 672 180, // 176 - 180 (index 3) | |
| 673 237, // 181 - 185 (index 4) | |
| 674 310, // 186 - 190 (index 5) | |
| 675 401, // 191 - 195 (index 6) | |
| 676 517, // 196 - 200 (index 7) | |
| 677 760, // 201 - 205 (index 8) | |
| 678 1100, // 206 - 210 (index 9) | |
| 679 1500, // 211 - 215 (index 10) | |
| 680 2090, // 216 - 220 (index 11) | |
| 681 2900, // 221 - 225 (index 12) | |
| 682 3900, // 226 - 230 (index 13) | |
| 683 4820, // 231 - 235 (index 14) | |
| 684 4820, // 236 - 240 (index 15) | |
| 685 4820, // 241 - 245 (index 16) | |
| 628 | 686 4820 // 246 - 250 (index 17) |
| 623 | 687 }; |
| 688 | |
| 689 | |
| 690 #ifndef UNIX | |
| 631 | 691 # pragma romdata Buhlmann_ab = 0x1DD00 // needs to be in the UPPER bank |
| 0 | 692 #endif |
| 693 | |
| 560 | 694 rom const float Buhlmann_ab[4*16] = { |
| 631 | 695 // Compartment a and b factors |
|
521
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696 // Data ZH-L16C, from Bühlmann Tauchmedizin 2002, option 1a (4mn) |
| 631 | 697 // a for N2 b for N2 a for He b for He |
|
521
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698 1.2599, 0.5050, 1.7424, 0.4245, |
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|
699 1.0000, 0.6514, 1.3830, 0.5747, |
|
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|
700 0.8618, 0.7222, 1.1919, 0.6527, |
|
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|
701 0.7562, 0.7825, 1.0458, 0.7223, |
|
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|
702 0.6200, 0.8126, 0.9220, 0.7582, |
|
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|
703 0.5043, 0.8434, 0.8205, 0.7957, |
|
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|
704 0.4410, 0.8693, 0.7305, 0.8279, |
|
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|
705 0.4000, 0.8910, 0.6502, 0.8553, |
|
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|
706 0.3750, 0.9092, 0.5950, 0.8757, |
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|
707 0.3500, 0.9222, 0.5545, 0.8903, |
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|
708 0.3295, 0.9319, 0.5333, 0.8997, |
|
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|
709 0.3065, 0.9403, 0.5189, 0.9073, |
|
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|
710 0.2835, 0.9477, 0.5181, 0.9122, |
|
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|
711 0.2610, 0.9544, 0.5176, 0.9171, |
|
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|
712 0.2480, 0.9602, 0.5172, 0.9217, |
|
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|
713 0.2327, 0.9653, 0.5119, 0.9267 |
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|
714 }; |
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|
715 |
| 631 | 716 |
| 717 #ifndef UNIX | |
| 718 # pragma romdata e_tables = 0x1DE00 // needs to be in the UPPER bank | |
| 719 #endif | |
| 720 | |
| 721 rom const float e2sec[2*16] = { | |
| 722 // Integration constants for 2 seconds, | |
| 723 // result of 1 - 2^(-(2sec/60sec / HT)) | |
|
521
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|
724 //---- N2 ------------- He ------------ |
| 623 | 725 5.75958E-03, 1.51848E-02, |
|
521
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|
726 2.88395E-03, 7.62144E-03, |
|
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|
727 1.84669E-03, 4.88315E-03, |
| 582 | 728 1.24813E-03, 3.29997E-03, |
| 729 8.55371E-04, 2.26041E-03, | |
| 730 6.03079E-04, 1.59437E-03, | |
| 731 4.25414E-04, 1.12479E-03, | |
| 732 3.00019E-04, 7.93395E-04, | |
| 733 2.11949E-04, 5.60641E-04, | |
| 734 1.58240E-04, 4.18555E-04, | |
| 735 1.23548E-04, 3.26795E-04, | |
| 736 9.66686E-05, 2.55722E-04, | |
| 737 7.57509E-05, 2.00387E-04, | |
| 738 5.92416E-05, 1.56716E-04, | |
| 739 4.63943E-05, 1.22734E-04, | |
| 740 3.63850E-05, 9.62538E-05 | |
|
521
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741 //------------------------------------- |
|
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742 }; |
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743 |
| 631 | 744 rom const float e6sec[2*16] = { |
| 745 // Integration constants for 6 seconds, | |
| 746 // result of 1 - 2^(-(6sec/60sec / HT)) | |
| 747 //---- N2 ------------- He ------------ | |
| 748 1.71794E-02, 4.48661E-02, | |
| 749 8.62691E-03, 2.26905E-02, | |
| 750 5.52983E-03, 1.45780E-02, | |
| 751 3.73973E-03, 9.86726E-03, | |
| 752 2.56392E-03, 6.76591E-03, | |
| 753 1.80815E-03, 4.77549E-03, | |
| 754 1.27570E-03, 3.37057E-03, | |
| 755 8.99786E-04, 2.37830E-03, | |
| 756 6.35713E-04, 1.68098E-03, | |
| 757 4.74646E-04, 1.25514E-03, | |
| 758 3.70598E-04, 9.80064E-04, | |
| 759 2.89978E-04, 7.66971E-04, | |
| 760 2.27236E-04, 6.01040E-04, | |
| 761 1.77714E-04, 4.70075E-04, | |
| 762 1.39176E-04, 3.68157E-04, | |
| 763 1.09151E-04, 2.88734E-04 | |
| 764 //------------------------------------- | |
| 765 }; | |
| 766 | |
|
521
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767 rom const float e1min[2*16] = { |
| 631 | 768 // Integration constants for 1 minute, |
| 769 // result of 1 - 2^(-(1min / HT)) | |
|
521
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770 //----- N2 --------- e 1min He -------- |
| 582 | 771 1.59104E-01, 3.68109E-01, |
| 772 8.29960E-02, 2.05084E-01, | |
| 773 5.39424E-02, 1.36579E-01, | |
| 774 3.67742E-02, 9.44046E-02, | |
| 775 2.53454E-02, 6.56359E-02, | |
| 776 1.79351E-02, 4.67416E-02, | |
| 777 1.26840E-02, 3.31991E-02, | |
| 778 8.96152E-03, 2.35301E-02, | |
| 779 6.33897E-03, 1.66832E-02, | |
| 780 4.73633E-03, 1.24808E-02, | |
| 781 3.69981E-03, 9.75753E-03, | |
| 782 2.89600E-03, 7.64329E-03, | |
| 783 2.27003E-03, 5.99417E-03, | |
| 784 1.77572E-03, 4.69082E-03, | |
| 785 1.39089E-03, 3.67548E-03, | |
| 786 1.09097E-03, 2.88359E-03 | |
|
521
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787 //------------------------------------- |
|
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788 }; |
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789 |
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790 rom const float e10min[2*16] = { |
| 631 | 791 // Integration constants for 10 minutes, |
| 792 // result of 1 - 2^(-(10min / HT)) | |
|
521
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793 //---- N2 -------------- He ----------- |
| 582 | 794 8.23223E-01, 9.89851E-01, |
| 795 5.79552E-01, 8.99258E-01, | |
| 796 4.25651E-01, 7.69737E-01, | |
| 797 3.12487E-01, 6.29027E-01, | |
| 798 2.26416E-01, 4.92821E-01, | |
| 799 1.65547E-01, 3.80407E-01, | |
| 800 1.19840E-01, 2.86538E-01, | |
| 801 8.60863E-02, 2.11886E-01, | |
| 802 6.16117E-02, 1.54849E-01, | |
| 803 4.63665E-02, 1.18026E-01, | |
| 804 3.63881E-02, 9.34005E-02, | |
| 805 2.85855E-02, 7.38569E-02, | |
| 806 2.24698E-02, 5.83504E-02, | |
| 807 1.76160E-02, 4.59303E-02, | |
| 808 1.38222E-02, 3.61528E-02, | |
| 809 1.08563E-02, 2.84646E-02 | |
|
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810 //------------------------------------- |
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811 }; |
| 0 | 812 |
| 604 | 813 |
| 814 // ********************************************************************************************************************************* | |
| 0 | 815 // |
| 604 | 816 // H E L P E R F U N C T I O N S |
| 817 // | |
| 818 // ********************************************************************************************************************************* | |
| 819 | |
| 820 | |
| 628 | 821 // p2deco code moved from 0x0D000 to 0x0C000 in v.108 |
| 634 | 822 // moved from 0x0C000 to 0x0B000 in v3.09 |
| 0 | 823 #ifndef UNIX |
| 634 | 824 # pragma code p2_deco = 0x0B000 |
| 0 | 825 #endif |
| 826 | |
| 827 | |
| 828 ////////////////////////////////////////////////////////////////////////////// | |
| 829 // Bump to blue-screen when an assert is wrong | |
| 623 | 830 #ifdef _DEBUG |
| 0 | 831 void assert_failed(PARAMETER short int line) |
| 832 { | |
| 833 } | |
| 834 #endif | |
| 835 | |
| 604 | 836 |
| 0 | 837 ////////////////////////////////////////////////////////////////////////////// |
| 628 | 838 // When calling C code from ASM context, the C data stack pointer need to be |
| 839 // reset. The C stack is located in bank 8. | |
| 0 | 840 |
| 841 #ifdef CROSS_COMPILE | |
| 584 | 842 # define RESET_C_STACK |
| 0 | 843 #else |
| 623 | 844 # ifdef _DEBUG |
| 584 | 845 # define RESET_C_STACK fillDataStack(); |
| 846 void fillDataStack(void) | |
| 847 { | |
| 848 _asm | |
| 604 | 849 LFSR 1,C_STACK |
| 850 MOVLW 0xCC | |
| 851 loop: MOVWF POSTINC1,0 | |
| 852 TSTFSZ FSR1L,0 | |
| 853 BRA loop | |
| 854 | |
| 855 LFSR 1,C_STACK | |
| 856 LFSR 2,C_STACK | |
| 584 | 857 _endasm |
| 858 } | |
| 859 # else | |
| 860 # define RESET_C_STACK \ | |
| 861 _asm \ | |
| 604 | 862 LFSR 1,C_STACK \ |
| 863 LFSR 2,C_STACK \ | |
| 584 | 864 _endasm |
| 865 # endif | |
| 0 | 866 #endif |
| 867 | |
| 604 | 868 |
| 0 | 869 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 870 // Reset timer 5 |
| 871 // | |
| 872 // Note: TMR5 is configured in 16 bit mode: a value written to TMR5H is buffered | |
| 873 // and will be written to TMR5 together with a successive write to TMR5L. | |
| 874 // As we don't know in which bank the code will be executed, we use either | |
| 875 // the bank-save "movff" command, or address mapping via access bank (",0"). | |
| 876 // | |
| 877 static void load_tmr5(void) | |
| 0 | 878 { |
| 879 #ifndef CROSS_COMPILE | |
| 584 | 880 _asm |
| 623 | 881 movff 0x601,0xF7D // bank-safe load TMR5H from C variable tmr5_value first |
| 640 | 882 movff 0x600,0xF7C // bank-safe load TMR5L from C variable tmr5_value thereafter |
| 623 | 883 bcf 0xFBA,1,0 // clear timer 5 overrun flag (0xFBA = PIR5, bit 1 = TMR5IF) |
| 884 _endasm | |
| 0 | 885 #else |
| 623 | 886 return; |
| 887 #endif | |
| 888 } | |
| 889 | |
| 890 | |
| 891 ////////////////////////////////////////////////////////////////////////////// | |
| 892 // Read timer 5 | |
| 893 // | |
| 894 // Note: TMR5 reads in multiples of 1/32 ms, 30.51757813 us/bit to be precise. | |
| 895 // TMR5 is configured in 16 bit mode: on reading of TMR5L the contents of | |
| 896 // TMR5H is latched and can be read afterwards without potential rollover. | |
| 897 // As we don't know in which bank the code will be executed, we use either | |
| 898 // the bank-save "movff" command, or address mapping via access bank (",0"). | |
| 899 // | |
| 900 static void read_tmr5(void) | |
| 901 { | |
| 902 #ifndef CROSS_COMPILE | |
| 903 _asm | |
| 904 movff 0xF7C,0x600 // copy TMR5L to C variable tmr5_value, low byte first | |
| 905 movff 0xF7D,0x601 // copy TMR5H to C variable tmr5_value, high byte thereafter | |
| 906 clrf WREG,0 // clear WREG to 0x00 = no overrun by default | |
| 907 btfsc 0xFBA,1,0 // did timer 5 overrun? (0xFBA = PIR5, bit 1 = TMR5IF) | |
| 908 setf WREG,0 // YES - set WREG to 0xff = overrun detected | |
| 909 movff WREG,0x602 // copy WREG to C variable tmr5_overflow | |
| 910 _endasm | |
| 911 #else | |
| 912 return; | |
| 0 | 913 #endif |
| 914 } | |
| 915 | |
| 604 | 916 |
| 0 | 917 ////////////////////////////////////////////////////////////////////////////// |
| 631 | 918 // Read CNS coefficients gain and offset |
| 623 | 919 // |
| 920 static void read_CNS_ab_coefficient(void) | |
| 921 { | |
| 922 #ifndef CROSS_COMPILE | |
| 923 // Note: We don't use far ROM pointer, because handling | |
| 924 // 24 bit is to complex, hence we have to set the | |
| 925 // UPPER page ourself... | |
| 926 // -> set to zero if tables are moved to lower pages! | |
| 927 _asm | |
| 928 movlw 1 | |
| 929 movwf TBLPTRU,0 | |
| 930 _endasm | |
| 931 #endif | |
| 932 | |
| 933 { | |
| 631 | 934 overlay rom const float* ptr = &CNS_2_approx[2*cns_i]; |
| 935 var_cns_gain = *ptr++; | |
| 936 var_cns_offset = *ptr++; | |
| 623 | 937 } |
| 938 } | |
| 939 | |
| 940 | |
| 941 ////////////////////////////////////////////////////////////////////////////// | |
| 942 // Read CNS coefficient c | |
| 943 // | |
| 944 static void read_CNS_c_coefficient(void) | |
| 945 { | |
| 946 #ifndef CROSS_COMPILE | |
| 947 // Note: We don't use far ROM pointer, because handling | |
| 948 // 24 bit is to complex, hence we have to set the | |
| 949 // UPPER page ourself... | |
| 950 // -> set to zero if tables are moved to lower pages! | |
| 951 _asm | |
| 952 movlw 1 | |
| 953 movwf TBLPTRU,0 | |
| 954 _endasm | |
| 955 #endif | |
| 956 | |
| 957 { | |
| 631 | 958 overlay rom const unsigned short* ptr = &CNS_1_approx[cns_i]; |
| 959 var_cns_value = *ptr++; | |
| 623 | 960 } |
| 961 } | |
| 962 | |
| 963 ////////////////////////////////////////////////////////////////////////////// | |
| 964 // Read Buhlmann coefficients a and b for compartment ci | |
| 0 | 965 // |
| 560 | 966 static void read_Buhlmann_coefficients(void) |
| 0 | 967 { |
| 968 #ifndef CROSS_COMPILE | |
| 604 | 969 // Note: We don't use far ROM pointer, because handling |
| 970 // 24 bit is too complex, hence we have to set the | |
| 971 // UPPER page ourself... | |
| 628 | 972 // -> set to zero if tables are moved to lower pages! |
| 584 | 973 _asm |
| 604 | 974 movlw 1 |
| 975 movwf TBLPTRU,0 | |
| 584 | 976 _endasm |
| 0 | 977 #endif |
| 978 | |
| 584 | 979 assert( ci < NUM_COMP ); |
| 980 | |
| 604 | 981 // use an interleaved array (AoS) to access coefficients with a single addressing |
| 584 | 982 { |
| 983 overlay rom const float* ptr = &Buhlmann_ab[4*ci]; | |
| 984 var_N2_a = *ptr++; | |
| 985 var_N2_b = *ptr++; | |
| 986 var_He_a = *ptr++; | |
| 987 var_He_b = *ptr++; | |
| 988 } | |
| 0 | 989 } |
| 990 | |
| 604 | 991 |
| 0 | 992 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 993 // Read Buhlmann increments for compartment ci |
| 604 | 994 // If period == 0 : 2 sec interval |
| 995 // 1 : 1 min interval | |
| 996 // 2 : 10 min interval | |
| 560 | 997 static void read_Buhlmann_times(PARAMETER char period) |
| 0 | 998 { |
| 999 #ifndef CROSS_COMPILE | |
| 604 | 1000 // Note: We don't use far ROM pointer, because handling |
| 1001 // 24 bit is to complex, hence we have to set the | |
| 631 | 1002 // UPPER page by hand... |
| 604 | 1003 // -> set to zero if tables are moved to lower pages! |
| 584 | 1004 _asm |
| 604 | 1005 movlw 1 |
| 1006 movwf TBLPTRU,0 | |
| 584 | 1007 _endasm |
| 0 | 1008 #endif |
| 1009 | |
| 584 | 1010 assert( ci < NUM_COMP ); |
| 1011 | |
| 623 | 1012 // Integration Intervals |
| 584 | 1013 switch(period) |
| 1014 { | |
| 631 | 1015 case 0: //---- 2 or 6 seconds -------------------------------------------- |
| 584 | 1016 { |
| 631 | 1017 // check which tissues are selected |
| 1018 if(tissue_increment & TISSUE_SELECTOR) | |
| 1019 { | |
| 1020 // real tissues - 2 seconds | |
| 1021 overlay rom const float* ptr = &e2sec[2*ci]; | |
| 1022 var_N2_e = *ptr++; | |
| 1023 var_He_e = *ptr++; | |
| 1024 } | |
| 1025 else | |
| 1026 { | |
| 1027 // simulated tissues - 6 seconds | |
| 1028 overlay rom const float* ptr = &e6sec[2*ci]; | |
| 1029 var_N2_e = *ptr++; | |
| 1030 var_He_e = *ptr++; | |
| 1031 } | |
| 584 | 1032 } |
| 1033 break; | |
| 1034 | |
| 631 | 1035 case 1: //---- 1 minutes ------------------------------------------------- |
| 584 | 1036 { |
| 1037 overlay rom const float* ptr = &e1min[2*ci]; | |
| 1038 var_N2_e = *ptr++; | |
| 1039 var_He_e = *ptr++; | |
| 1040 } | |
| 1041 break; | |
| 1042 | |
| 631 | 1043 case 2: //---- 10 minutes ------------------------------------------------ |
| 584 | 1044 { |
| 1045 overlay rom const float* ptr = &e10min[2*ci]; | |
| 1046 var_N2_e = *ptr++; | |
| 1047 var_He_e = *ptr++; | |
| 1048 } | |
| 623 | 1049 break; |
| 584 | 1050 |
| 1051 default: | |
| 623 | 1052 assert(0); // code execution shall never pass along here! |
| 584 | 1053 } |
| 0 | 1054 } |
| 1055 | |
| 604 | 1056 |
| 0 | 1057 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 1058 // Read Buhlmann half-times for compartment ci |
| 0 | 1059 // |
| 560 | 1060 static void read_Buhlmann_ht(void) |
| 0 | 1061 { |
| 1062 | |
| 1063 #ifndef CROSS_COMPILE | |
| 604 | 1064 // Note: We don't use far ROM pointer, because handling |
| 1065 // 24 bit is to complex, hence we have to set the | |
| 1066 // UPPER page ourself... | |
| 1067 // -> Set to zero if tables are moved to lower pages! | |
| 584 | 1068 _asm |
| 604 | 1069 movlw 1 |
| 1070 movwf TBLPTRU,0 | |
| 584 | 1071 _endasm |
| 0 | 1072 #endif |
| 1073 | |
| 584 | 1074 assert( ci < NUM_COMP ); |
| 1075 { | |
| 1076 overlay rom const float* ptr = &Buhlmann_ht[2*ci]; | |
| 1077 var_N2_ht = *ptr++; | |
| 1078 var_He_ht = *ptr++; | |
| 1079 } | |
| 1080 | |
| 604 | 1081 assert( 4.0 <= var_N2_ht && var_N2_ht <= 635.0 ); |
| 584 | 1082 assert( 1.5099 <= var_He_ht && var_He_ht <= 240.03 ); |
| 0 | 1083 } |
| 1084 | |
| 604 | 1085 |
| 0 | 1086 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 1087 // Calculate adopted Buhlmann coefficients |
| 1088 // | |
| 1089 // Input: var_N2_a, var_N2_b coefficients for N2 | |
| 1090 // var_He_a, var_He_b coefficients for He | |
| 1091 // calc_pres_tissue_N2 partial pressure of N2 in tissue | |
| 1092 // calc_pres_tissue_He partial pressure of He in tissue | |
| 1093 // pres_tissue total pressure in tissue | |
| 1094 // | |
| 1095 // Output: var_a, var_b coefficients adopted by N2/He ratio | |
| 604 | 1096 // |
| 1097 static void adopt_Buhlmann_coefficients(void) | |
| 1098 { | |
| 1099 // adopt a and b coefficients to current N2/He ratio inside the tissue | |
| 623 | 1100 |
| 1101 #ifdef _helium | |
| 1102 | |
| 1103 var_a = (var_N2_a * calc_pres_tissue_N2 + var_He_a * calc_pres_tissue_He) / pres_tissue; | |
| 1104 var_b = (var_N2_b * calc_pres_tissue_N2 + var_He_b * calc_pres_tissue_He) / pres_tissue; | |
| 1105 | |
| 1106 #else | |
| 1107 | |
| 1108 var_a = var_N2_a; | |
| 1109 var_b = var_N2_b; | |
| 1110 | |
| 1111 #endif | |
| 1112 | |
| 1113 } | |
| 1114 | |
| 1115 | |
| 1116 ////////////////////////////////////////////////////////////////////////////// | |
| 1117 // Calculate partial pressure of N2 in respired air at surface pressure | |
| 1118 // | |
| 1119 // Input: pres_surface surface pressure | |
| 1120 // | |
| 1121 // Output: N2_equilibrium partial pressure of N2 in surface air | |
| 1122 // | |
| 1123 static void calc_N2_equilibrium(void) | |
| 1124 { | |
| 1125 N2_equilibrium = 0.7902 * (pres_surface - ppWater); | |
| 1126 } | |
| 1127 | |
| 1128 | |
| 1129 ////////////////////////////////////////////////////////////////////////////// | |
| 1130 // Get, safeguard and convert the saturation and desaturation factors | |
| 1131 // | |
| 1132 // Input: char_I_saturation_multiplier saturation factor (integer) | |
| 1133 // char_I_desaturation_multiplier desaturation factor (integer) | |
| 1134 // | |
| 1135 // Output: float_saturation_multiplier saturation factor (float) | |
| 1136 // float_desaturation_multiplier desaturation factor (float) | |
| 1137 // | |
| 1138 static void get_saturation_factors(void) | |
| 1139 { | |
| 1140 // safeguard input parameters that are constant during the course of the dive | |
| 1141 if( char_I_saturation_multiplier < 100 ) char_I_saturation_multiplier = 100; | |
| 1142 if( char_I_saturation_multiplier > 140 ) char_I_saturation_multiplier = 140; | |
| 1143 | |
| 1144 if( char_I_desaturation_multiplier < 60 ) char_I_desaturation_multiplier = 60; | |
| 1145 if( char_I_desaturation_multiplier > 100 ) char_I_desaturation_multiplier = 100; | |
| 1146 | |
| 1147 // convert input parameters to float numbers | |
| 1148 float_saturation_multiplier = 0.01 * char_I_saturation_multiplier; | |
| 1149 float_desaturation_multiplier = 0.01 * char_I_desaturation_multiplier; | |
| 1150 } | |
| 1151 | |
| 1152 | |
| 1153 ////////////////////////////////////////////////////////////////////////////// | |
| 1154 // apply_saturation_factors | |
| 1155 // | |
| 1156 // Apply safety factors for both ZH-L16 models. | |
| 1157 // | |
| 1158 // Modified: temp_tissue safeguarded tissue increment/decrement | |
| 1159 // | |
| 1160 static void apply_saturation_factors(void) | |
| 1161 { | |
| 1162 assert( 0.0 < float_desaturation_multiplier && float_desaturation_multiplier <= 1.0 ); | |
| 1163 assert( 1.0 <= float_saturation_multiplier && float_saturation_multiplier <= 2.0 ); | |
| 1164 | |
| 1165 if ( temp_tissue < 0.0 ) temp_tissue *= float_desaturation_multiplier; | |
| 1166 else temp_tissue *= float_saturation_multiplier; | |
| 1167 } | |
| 1168 | |
| 1169 | |
| 1170 ////////////////////////////////////////////////////////////////////////////// | |
| 1171 // convert_float_to_int | |
| 1172 // | |
| 1173 // Converts a float within range 0.0 - 9.99 into 16 bit integer scaled in 1/100. | |
| 1174 // | |
| 1175 static void convert_float_to_int(void) | |
| 1176 { | |
| 1177 if ( float_value < 0.005 ) int_value = 0; | |
| 1178 else if ( float_value >= 9.985 ) int_value = 999; | |
| 1179 else int_value = (unsigned short)(100 * float_value + 0.5); | |
| 1180 } | |
| 1181 | |
| 1182 | |
| 604 | 1183 |
| 1184 // ********************************************************************************************************************************* | |
| 1185 // | |
| 1186 // J U M P I N F U N C T I O N S | |
| 1187 // | |
| 1188 // ********************************************************************************************************************************* | |
| 1189 | |
| 582 | 1190 |
| 1191 ////////////////////////////////////////////////////////////////////////////// | |
| 1192 // deco_calc_hauptroutine | |
| 1193 // | |
| 1194 // called from: divemode.asm | |
| 1195 // | |
| 628 | 1196 // Called two times per second during diving, updates the |
| 1197 // tissues every second (i.e. on every second invocation). | |
| 582 | 1198 // |
| 628 | 1199 // On each computation cycle: |
| 582 | 1200 // - Updates deco table (char_O_deco_time/depth) with new values, |
| 1201 // - updates ascent time, and | |
| 628 | 1202 // - sets status to zero (so we can check a cycle has finished). |
| 582 | 1203 // |
| 1204 void deco_calc_hauptroutine(void) | |
| 1205 { | |
| 1206 RESET_C_STACK | |
| 1207 calc_hauptroutine(); | |
| 1208 } | |
| 1209 | |
| 623 | 1210 |
| 1211 ////////////////////////////////////////////////////////////////////////////// | |
| 1212 // deco_init_output_vars | |
| 1213 // | |
| 1214 // called from divemode.asm | |
| 1215 // | |
| 1216 // Initializes all output variables to their default values. | |
| 1217 // | |
| 1218 void deco_init_output_vars(void) | |
| 1219 { | |
| 1220 RESET_C_STACK | |
| 1221 init_output_vars(); | |
| 1222 } | |
| 1223 | |
| 628 | 1224 |
| 582 | 1225 ////////////////////////////////////////////////////////////////////////////// |
| 1226 // deco_clear_tissue | |
| 1227 // | |
| 1228 // called from: start.asm | |
| 1229 // menu_tree.asm | |
| 1230 // simulator.asm | |
| 1231 // | |
| 628 | 1232 // Sets all tissues to equilibrium with air at ambient pressure, |
| 582 | 1233 // resets all CNS values, any warnings and resets all model output. |
| 1234 // | |
| 1235 void deco_clear_tissue(void) | |
| 1236 { | |
| 1237 RESET_C_STACK | |
| 1238 clear_tissue(); | |
| 1239 } | |
| 1240 | |
| 623 | 1241 |
| 582 | 1242 ////////////////////////////////////////////////////////////////////////////// |
| 1243 // deco_calc_dive_interval | |
| 1244 // | |
| 1245 // called from: simulator.asm | |
| 1246 // | |
| 628 | 1247 // Updates tissues and CNS value for char_I_dive_interval minutes on air at |
| 1248 // ambient pressure and calculates resulting saturation and ceiling for a | |
| 1249 // GF-high of 100% (ceiling and saturation not used by simulator.asm) | |
| 582 | 1250 // |
| 1251 void deco_calc_dive_interval(void) | |
| 1252 { | |
| 1253 RESET_C_STACK | |
| 1254 calc_interval(char_I_dive_interval); | |
| 1255 } | |
| 1256 | |
| 623 | 1257 |
| 582 | 1258 ////////////////////////////////////////////////////////////////////////////// |
| 1259 // deco_calc_dive_interval_1min | |
| 1260 // | |
| 1261 // called from: start.asm | |
| 1262 // sleepmode.asm | |
| 1263 // surfmode.asm | |
| 1264 // menu_tree.asm | |
| 1265 // ghostwriter.asm | |
| 1266 // | |
| 604 | 1267 // Updates tissues and CNS value for 1 minute on air at ambient pressure and |
| 628 | 1268 // calculates resulting saturation and ceiling for a GF-high of 100%. |
| 582 | 1269 // |
| 1270 void deco_calc_dive_interval_1min(void) | |
| 1271 { | |
| 1272 RESET_C_STACK | |
| 1273 calc_interval(1); | |
| 1274 } | |
| 1275 | |
| 1276 | |
| 1277 ////////////////////////////////////////////////////////////////////////////// | |
| 604 | 1278 // deco_calc_dive_interval_10min |
| 582 | 1279 // |
| 1280 // called from: sleepmode.asm | |
| 1281 // | |
| 604 | 1282 // Updates tissues and CNS value for 10 minutes on air at ambient pressure and |
| 628 | 1283 // calculates resulting saturation and ceiling for a GF-high of 100%. |
| 582 | 1284 // |
| 1285 void deco_calc_dive_interval_10min(void) | |
| 1286 { | |
| 1287 RESET_C_STACK | |
| 1288 calc_interval(10); | |
| 1289 } | |
| 1290 | |
| 1291 | |
| 1292 ////////////////////////////////////////////////////////////////////////////// | |
| 1293 // deco_calc_desaturation_time | |
| 1294 // | |
| 1295 // called from: start.asm | |
| 1296 // surfmode.asm | |
| 1297 // menu_tree.asm | |
| 1298 // ghostwriter.asm | |
| 1299 // | |
| 1300 // Computes desaturation and no-fly times. | |
| 1301 // | |
| 1302 void deco_calc_desaturation_time(void) | |
| 1303 { | |
| 1304 RESET_C_STACK | |
| 1305 calc_desaturation_time(); | |
| 1306 } | |
| 1307 | |
| 623 | 1308 |
| 582 | 1309 ////////////////////////////////////////////////////////////////////////////// |
| 1310 // deco_push_tissues_to_vault | |
| 1311 // | |
| 1312 // called from: simulator.asm | |
| 1313 // | |
| 1314 // Makes a backup of the state of the real tissues and the deco engine. | |
| 1315 // | |
| 1316 void deco_push_tissues_to_vault(void) | |
| 1317 { | |
| 1318 RESET_C_STACK | |
| 1319 push_tissues_to_vault(); | |
| 1320 } | |
| 1321 | |
| 623 | 1322 |
| 582 | 1323 ////////////////////////////////////////////////////////////////////////////// |
| 1324 // deco_pull_tissues_from_vault | |
| 1325 // | |
| 1326 // called from: simulator.asm | |
| 1327 // ghostwriter.asm | |
| 1328 // | |
| 1329 // Restores the state of the real tissues and the deco engine from the backup. | |
| 1330 // | |
| 1331 void deco_pull_tissues_from_vault(void) | |
| 1332 { | |
| 1333 RESET_C_STACK | |
| 1334 pull_tissues_from_vault(); | |
| 1335 } | |
| 1336 | |
| 604 | 1337 |
| 1338 // ********************************************************************************************************************************* | |
| 1339 // | |
| 1340 // M A I N F U N C T I O N S | |
| 1341 // | |
| 1342 // ********************************************************************************************************************************* | |
| 582 | 1343 |
| 1344 | |
| 1345 ////////////////////////////////////////////////////////////////////////////// | |
| 628 | 1346 // Calculate the next deco stop |
| 0 | 1347 // |
| 1348 // INPUT, fixed during dive: | |
| 623 | 1349 // pres_surface : surface pressure (as absolute pressure) |
| 631 | 1350 // char_I_last_stop_depth : depth of the last deco stop |
| 623 | 1351 // |
| 628 | 1352 // INPUT, may change during dive: |
| 623 | 1353 // GF_high : GF high factor |
| 1354 // GF_low : GF low factor | |
| 631 | 1355 // GF_depth : GF low reference depth |
| 1356 // GF_slope : GF slope | |
| 1357 // | |
| 1358 // MODIFIED | |
| 623 | 1359 // char_depth_sim : simulated depth in meters |
| 0 | 1360 // |
| 1361 // OUTPUT | |
| 631 | 1362 // GF_depth_norm/_alt : updated GF low depth reference |
| 1363 // GF_slope_norm/_alt : updated GF slope | |
| 623 | 1364 // |
| 1365 // RETURN | |
| 631 | 1366 // TRUE: a deco stop is required, FALSE: no deco stop required |
| 623 | 1367 // |
| 1368 static unsigned char find_next_stop(void) | |
| 0 | 1369 { |
| 623 | 1370 overlay unsigned char depth_1min; |
| 1371 overlay unsigned char depth_limit; | |
| 628 | 1372 overlay unsigned char stop_depth; |
| 1373 overlay unsigned char next_stop; | |
| 631 | 1374 |
| 1375 | |
| 1376 // calculate the current deco ceiling (minimum relative pressure) | |
| 1377 if( char_I_model == 0 ) calc_limit(1.0); // straight Buhlmann | |
| 1378 else if( NDL_time ) calc_limit(GF_high); // with GF: not in deco | |
| 1379 else if( char_depth_sim >= GF_depth ) calc_limit(GF_low); // in deco, below or at low depth reference | |
| 1380 else calc_limit(GF_high - GF_slope * (float)char_depth_sim); // in deco, above low depth reference | |
| 1381 | |
| 1382 // convert the deco ceiling from relative pressure to meters, | |
| 1383 // rounded up (i.e. made deeper) to the next full meter | |
| 1384 depth_limit = (unsigned char)(ceiling * BAR_TO_METER + 0.99); | |
| 1385 | |
| 1386 | |
| 1387 #ifdef _cave_mode | |
| 1388 // in cave or open water mode? | |
| 1389 if( main_status & CAVE_MODE ) | |
| 623 | 1390 { |
| 631 | 1391 // cave mode |
| 1392 | |
| 1393 // does backtracking require descent or keeping depth? | |
| 1394 if( backtrack_target_depth >= char_depth_sim ) | |
| 1395 { | |
| 1396 // YES - decent to target depth or stay at current depth | |
| 1397 char_depth_sim = backtrack_target_depth; | |
| 1398 | |
| 1399 // - done, no stop required | |
| 1400 return(0); | |
| 1401 } | |
| 1402 else | |
| 1403 { | |
| 1404 // NO | |
| 1405 | |
| 1406 // target depth requires an ascent - determine ascent limit due to deco obligation | |
| 1407 stop_depth = depth_limit; | |
| 1408 | |
| 1409 // apply correction for the shallowest stop | |
| 1410 if( stop_depth && (stop_depth < char_I_last_stop_depth) ) stop_depth = char_I_last_stop_depth; | |
| 1411 } | |
| 623 | 1412 } |
| 1413 else | |
| 631 | 1414 #endif |
| 623 | 1415 { |
| 631 | 1416 // open water vertical ascent mode - determine the stop depth |
| 1417 | |
| 1418 // stop depth is depth limit rounded up (made deeper) to the next multiple of 3 meters | |
| 1419 stop_depth = 3 * ( (depth_limit + 2) / 3 ); | |
| 1420 | |
| 1421 // apply correction for the shallowest stop | |
| 1422 if( stop_depth == 3 ) stop_depth = char_I_last_stop_depth; | |
| 623 | 1423 } |
| 1424 | |
| 631 | 1425 // is the stop depth shallower than the current depth (can we ascent)? |
| 1426 if( stop_depth < char_depth_sim ) | |
| 623 | 1427 { |
| 631 | 1428 // YES - ascent by 1 meter |
| 1429 char_depth_sim--; | |
| 1430 | |
| 1431 // done, no stop needed | |
| 1432 return(0); | |
| 623 | 1433 } |
| 1434 | |
| 1435 // ----------------------------------------------------------------------- | |
| 631 | 1436 // we need to make a stop because we are not allowed to ascent any further |
| 623 | 1437 // ----------------------------------------------------------------------- |
| 1438 | |
| 631 | 1439 // set depth to stop depth |
| 628 | 1440 char_depth_sim = stop_depth; |
| 1441 | |
| 1442 // Apply correction in case the stop is to be placed deeper than a | |
| 1443 // previously recorded stop for a gas change. This may happen because | |
| 1444 // the deco stops are placed at the next deeper multiple of 3 meters | |
| 1445 // instead of the real stop's depth. Correction is to relocate the | |
| 1446 // deco stop to the depth of the last gas change. The resulting combined | |
| 1447 // stop's duration will be the sum of the configured gas change time plus | |
| 1448 // the duration of the deco stop itself. | |
| 1449 if( 0 < internal_deco_depth[stop_index] ) | |
| 1450 if( char_depth_sim > internal_deco_depth[stop_index] ) | |
| 631 | 1451 char_depth_sim = internal_deco_depth[stop_index]; |
| 1452 | |
| 1453 // if using straight Buhlmann: done, stop needed | |
| 1454 if( char_I_model == 0 ) return(1); | |
| 623 | 1455 |
| 1456 // ----------------------------------------------------------------------- | |
| 628 | 1457 // we need to make or hold a stop and we are using the GF extension |
| 623 | 1458 // ----------------------------------------------------------------------- |
| 1459 | |
| 631 | 1460 // is the stop_depth deeper than the GF low depth reference used up to now? |
| 1461 if( stop_depth > GF_depth ) | |
| 623 | 1462 { |
| 631 | 1463 // YES - update the GF low depth reference |
| 1464 GF_depth = stop_depth; | |
| 1465 GF_slope = (GF_high - GF_low) / (float)GF_depth; | |
| 623 | 1466 |
| 1467 // store for use in next cycles | |
| 1468 if( deco_status & CALC_NORM ) | |
| 560 | 1469 { |
| 631 | 1470 GF_depth_norm = GF_depth; |
| 1471 GF_slope_norm = GF_slope; | |
| 582 | 1472 } |
| 560 | 1473 else |
| 1474 { | |
| 631 | 1475 GF_depth_alt = GF_depth; |
| 1476 GF_slope_alt = GF_slope; | |
| 560 | 1477 } |
| 623 | 1478 } |
| 1479 | |
| 631 | 1480 #ifdef _cave_mode |
| 1481 // if in cave mode: done, stop needed | |
| 1482 if( main_status & CAVE_MODE ) return(1); | |
| 1483 #endif | |
| 1484 | |
| 1485 // We have a stop depth candidate. But with a steep GF slope, the stop(s) after | |
| 1486 // this first stop may be allowed to ascent to, too. This is because the gradient | |
| 623 | 1487 // factor that will be used at the next depth(s) will allow more tissue super- |
| 631 | 1488 // saturation, maybe so much more that the next stop(s) will be allowed to ascent |
| 1489 // to. So we have to probe the next stops that are within the reach of 1 minute | |
| 1490 // of ascent as well. | |
| 1491 | |
| 1492 // compute depth in meters that is reachable within 1 minute of ascent at 10 m/min | |
| 1493 depth_1min = ( char_depth_sim > 10 ) ? char_depth_sim - 10 : 0; | |
| 623 | 1494 |
| 628 | 1495 // probe all stop depths that are in reach of 1 minute of ascent |
| 631 | 1496 next_stop = stop_depth; |
| 628 | 1497 |
| 1498 while(next_stop > 0) | |
| 623 | 1499 { |
| 631 | 1500 // compute the depth of the next stop to probe |
| 1501 if ( next_stop <= char_I_last_stop_depth ) next_stop = 0; | |
| 1502 else if ( next_stop == 6 ) next_stop = char_I_last_stop_depth; | |
| 628 | 1503 else next_stop -= 3; |
| 1504 | |
| 631 | 1505 // done if the next stop would be above the 1 minute limit |
| 1506 if( next_stop < depth_1min ) return(1); | |
| 1507 | |
| 1508 // compute the ceiling for the next stop depth | |
| 1509 calc_limit(GF_high - GF_slope * (float)next_stop); | |
| 1510 | |
| 1511 // done if the next stop would be above the ceiling | |
| 1512 if( next_stop < (unsigned char)(ceiling * BAR_TO_METER + 0.99) ) return(1); | |
| 1513 | |
| 1514 // the next stop depth is allowed, ascent to it and redo trying further stop | |
| 1515 char_depth_sim = next_stop; | |
| 582 | 1516 } |
| 1517 | |
| 631 | 1518 // reached the surface, done with no further stop |
| 1519 return(0); | |
| 0 | 1520 } |
| 1521 | |
| 604 | 1522 |
| 0 | 1523 ////////////////////////////////////////////////////////////////////////////// |
| 631 | 1524 // Take the actual currently used gas for ascent & deco calculation |
| 1525 // | |
| 1526 // Input: start_gas_num number of the gas/dil to start with (1..5 or 6) | |
| 623 | 1527 // |
| 1528 // Output: sim_gas_current_num 1..6 or 0 for the manually configured gas/dil | |
| 1529 // sim_gas_current_depth change depth (MOD) of the gas/dil in meters | |
| 560 | 1530 // |
| 628 | 1531 static void gas_take_current(void) |
| 560 | 1532 { |
| 631 | 1533 assert( 1 <= start_gas_num && start_gas_num <= 6 ); |
| 1534 | |
| 1535 | |
| 1536 // check origin of the gas/diluent to start with | |
| 1537 if( start_gas_num <= NUM_GAS ) | |
| 582 | 1538 { |
| 631 | 1539 // pre-configured gas/diluent |
| 1540 | |
| 1541 // set gas number | |
| 1542 sim_gas_current_num = sim_gas_last_num = start_gas_num; | |
| 1543 | |
| 1544 // set change depth | |
| 1545 sim_gas_current_depth = char_I_deco_gas_change[start_gas_num-1]; | |
| 628 | 1546 |
| 1547 // capture case of non-configured change depth | |
| 1548 if( sim_gas_current_depth == 0 ) sim_gas_current_depth = 255; | |
| 582 | 1549 } |
| 1550 else | |
| 560 | 1551 { |
| 631 | 1552 // on-the-fly configured gas/diluent ("gas 6") |
| 1553 | |
| 1554 // set gas number | |
| 1555 sim_gas_current_num = sim_gas_last_num = 0; | |
| 1556 | |
| 1557 // set change depth | |
| 604 | 1558 sim_gas_current_depth = char_I_gas6_depth; |
| 560 | 1559 } |
| 1560 } | |
| 1561 | |
| 1562 | |
| 1563 ////////////////////////////////////////////////////////////////////////////// | |
| 628 | 1564 // Find the gas with the shallowest change depth below or at the current depth |
| 560 | 1565 // |
| 623 | 1566 // Input: char_depth_sim simulated depth in meters |
| 1567 // sim_gas_current_num number of the currently used gas/dil | |
| 631 | 1568 // deco_gas_type[] types and state of the gases/dils |
| 1569 // char_I_deco_gas_change[] change depths of the gases/dils | |
| 623 | 1570 // |
| 628 | 1571 // Modified: sim_gas_best_num index of the gas (1..5) - only if return value is true |
| 1572 // sim_gas_best_depth switch depth - only if return value is true | |
| 623 | 1573 // |
| 1574 // Return value is TRUE if a better gas is available | |
| 560 | 1575 // |
| 628 | 1576 static unsigned char gas_find_best(void) |
| 560 | 1577 { |
| 641 | 1578 overlay unsigned char switch_depth = sim_gas_current_depth; |
| 604 | 1579 overlay unsigned char switch_gas = 0; |
| 631 | 1580 |
| 582 | 1581 |
| 628 | 1582 // loop over all gases to find the shallowest one below or at current depth |
| 604 | 1583 for( j = 0; j < NUM_GAS; ++j ) |
| 560 | 1584 { |
| 631 | 1585 // is this gas available? |
| 1586 if( ( deco_gas_type[j] & GAS_TYPE_MASK ) // gas enabled (type > 0) ? | |
| 1587 && !( deco_gas_type[j] & GAS_AVAIL_MASK ) // neither lost nor staged ? | |
| 1588 ) | |
| 1589 | |
| 1590 // is it not a deco gas unless: | |
| 1591 // extended stops are activated | |
| 1592 // OR we are on a deco stop | |
| 1593 // OR we are in bailout but not in cave mode | |
| 1594 if( ( ( deco_gas_type[j] & GAS_TYPE_MASK ) < 3 ) | |
| 1595 || ( ( main_status & EXTENDED_STOPS ) ) | |
| 1596 || ( ( deco_status & CALC_NORM ) && ( deco_info & DECO_STOPS_NORM ) ) | |
| 1597 || ( ( deco_status & CALC_ALT ) && ( deco_info & DECO_STOPS_ALT ) ) | |
| 1598 || ( ( deco_status & BAILOUT_MODE ) && !( main_status & CAVE_MODE ) ) | |
| 1599 ) | |
| 1600 | |
| 1601 // is the change depth of the this gas deeper than or | |
| 604 | 1602 // at least equal to the current depth? |
| 623 | 1603 if( char_I_deco_gas_change[j] >= char_depth_sim ) |
| 604 | 1604 |
| 631 | 1605 // is the change depth of this gas shallower than |
| 1606 // the change depth of the best gas found so far, | |
| 1607 // or is it the first better gas found? | |
| 1608 if( char_I_deco_gas_change[j] < switch_depth ) | |
| 628 | 1609 |
| 1610 #ifdef _gas_contingency | |
| 631 | 1611 // is there still enough of this gas or shall we don't care? |
| 1612 if( !(deco_gas_type[j] & GAS_FULLY_USED_UP ) | |
| 1613 || !( main_status & GAS_CONTINGENCY ) | |
| 1614 || !( main_status & CALC_VOLUME ) | |
| 1615 ) | |
| 628 | 1616 #endif |
| 604 | 1617 |
| 631 | 1618 // if there is a yes to all these questions, we have a better gas! |
| 560 | 1619 { |
| 628 | 1620 // memorize this gas (1..5) and its change depth |
| 1621 switch_gas = j+1; | |
| 1622 switch_depth = char_I_deco_gas_change[j]; | |
| 560 | 1623 } |
| 631 | 1624 |
| 560 | 1625 } // continue looping through all gases to eventually find an even better gas |
| 1626 | |
| 628 | 1627 // has a best gas been found? |
| 560 | 1628 if( switch_gas ) |
| 1629 { | |
| 628 | 1630 // YES - export the best gas and its change depth |
| 1631 sim_gas_best_num = switch_gas; | |
| 1632 sim_gas_best_depth = switch_depth; | |
| 1633 | |
| 1634 // is the best gas different from the current gas? | |
| 1635 if( sim_gas_best_num != sim_gas_current_num ) | |
| 1636 { | |
| 1637 // YES - signal advice for a gas change | |
| 1638 return 1; | |
| 1639 } | |
| 560 | 1640 } |
| 628 | 1641 |
| 1642 // no best gas found or current gas is the best gas | |
| 1643 return 0; | |
| 1644 } | |
| 1645 | |
| 1646 | |
| 1647 ////////////////////////////////////////////////////////////////////////////// | |
| 1648 // Switch to the best gas | |
| 1649 // | |
| 1650 // Input: sim_gas_best_num index of the best gas (1..5) | |
| 1651 // sim_gas_best_depth switch depth of the best gas | |
| 1652 // | |
| 1653 // Modified: sim_gas_current_num index of the new gas (1..5) | |
| 1654 // sim_gas_current_depth switch depth of the new gas | |
| 1655 // | |
| 1656 static void gas_take_best(void) | |
| 1657 { | |
| 631 | 1658 // memorize current gas as last gas used |
| 1659 sim_gas_last_num = sim_gas_current_num; | |
| 1660 | |
| 628 | 1661 // set new gas |
| 1662 sim_gas_current_num = sim_gas_best_num; | |
| 1663 sim_gas_current_depth = sim_gas_best_depth; | |
| 0 | 1664 } |
| 1665 | |
| 604 | 1666 |
| 0 | 1667 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 1668 // Set calc_N2/He/O2_ratios by sim_gas_current_num |
| 1669 // | |
| 1670 // Input: sim_gas_current_num index of gas to use | |
| 1671 // real_O2_ratio, real_He_ratio if gas = 0 (the manually set gas) | |
| 1672 // char_I_deco_O2/He_ratio[] if gas = 1..5 (the configured gases) | |
| 1673 // | |
| 1674 // Output: sim_N2_ratio, sim_He_ratio ratios of the inert gases | |
| 1675 // sim_pSCR_drop ppO2 drop in pSCR loop | |
| 0 | 1676 // |
| 582 | 1677 static void gas_set_ratios(void) |
| 0 | 1678 { |
| 582 | 1679 overlay float sim_IG_ratio; |
| 1680 | |
| 623 | 1681 assert( 0 <= sim_gas_current_num <= NUM_GAS ); |
| 1682 | |
| 1683 | |
| 1684 #ifdef _helium | |
| 582 | 1685 // get gas ratios |
| 623 | 1686 if( sim_gas_current_num == 0 ) |
| 560 | 1687 { |
| 604 | 1688 sim_O2_ratio = real_O2_ratio; |
| 1689 sim_He_ratio = real_He_ratio; | |
| 560 | 1690 } |
| 1691 else | |
| 1692 { | |
| 623 | 1693 sim_O2_ratio = 0.01 * char_I_deco_O2_ratio[sim_gas_current_num-1]; |
| 1694 sim_He_ratio = 0.01 * char_I_deco_He_ratio[sim_gas_current_num-1]; | |
| 560 | 1695 } |
| 1696 | |
| 582 | 1697 // inert gas ratio (local helper variable) |
| 604 | 1698 sim_IG_ratio = 1.00 - sim_O2_ratio; |
| 582 | 1699 |
| 1700 // N2 ratio | |
| 604 | 1701 sim_N2_ratio = sim_IG_ratio - sim_He_ratio; |
| 623 | 1702 #else |
| 1703 // get O2 ratio | |
| 1704 sim_O2_ratio = ( sim_gas_current_num == 0 ) ? real_O2_ratio : 0.01 * char_I_deco_O2_ratio[sim_gas_current_num-1]; | |
| 1705 | |
| 1706 // set H2 ratio to zero | |
| 1707 sim_He_ratio = 0.0; | |
| 1708 | |
| 1709 // inert gas ratio (local helper variable) | |
| 1710 sim_IG_ratio = 1.00 - sim_O2_ratio; | |
| 1711 | |
| 1712 // N2 ratio | |
| 1713 sim_N2_ratio = sim_IG_ratio; | |
| 1714 #endif | |
| 1715 | |
| 1716 #ifdef _ccr_pscr | |
| 582 | 1717 // ppO2 drop in pSCR loop |
| 604 | 1718 sim_pSCR_drop = sim_IG_ratio * float_pSCR_factor; |
| 623 | 1719 #endif |
| 582 | 1720 |
| 1721 | |
| 1722 assert( 0.0 <= sim_N2_ratio && sim_N2_ratio <= 0.95 ); | |
| 1723 assert( 0.0 <= sim_He_ratio && sim_He_ratio <= 0.95 ); | |
| 1724 assert( (sim_N2_ratio + sim_He_ratio) <= 0.95 ); | |
| 0 | 1725 } |
| 1726 | |
| 604 | 1727 |
| 0 | 1728 ////////////////////////////////////////////////////////////////////////////// |
| 604 | 1729 // Compute respired ppO2, ppN2 and ppHe |
| 0 | 1730 // |
| 631 | 1731 // Input: tissue_increment : selector for simulated/real tissues and gases |
| 623 | 1732 // main_status : breathing mode for real tissues |
| 1733 // deco_status : breathing mode for simulated tissues | |
| 604 | 1734 // sim_/real_O2_ratio : (simulated) O2 ratio breathed |
| 1735 // sim_/real_N2_ratio : (simulated) N2 ratio breathed | |
| 1736 // sim_/real_He_ratio : (simulated) He ratio breathed | |
| 1737 // sim_/real_pres_respiration : (simulated) respiration pressure [bar] | |
| 1738 // sim_/real_pSCR_drop : (simulated) pSCR O2 drop | |
| 1739 // pres_surface : surface pressure [bar] | |
| 1740 // char_I_const_ppO2 : ppO2 reported from sensors or setpoint [cbar] | |
| 1741 // ppWater : water-vapor pressure inside respiratory tract [bar] | |
| 0 | 1742 // |
| 604 | 1743 // Output: ppN2 : respired N2 partial pressure |
| 1744 // ppHe : respired He partial pressure | |
| 623 | 1745 // char_ppO2 : breathed ppO2 in %, used for CNS calculation |
| 0 | 1746 // |
| 582 | 1747 void calc_alveolar_pressures(void) |
| 0 | 1748 { |
| 604 | 1749 overlay float calc_pres_respiration; |
| 582 | 1750 overlay float calc_O2_ratio; |
| 1751 overlay float calc_N2_ratio; | |
| 623 | 1752 |
| 1753 #ifdef _helium | |
| 582 | 1754 overlay float calc_He_ratio; |
| 623 | 1755 #endif |
| 1756 | |
| 1757 #ifdef _ccr_pscr | |
| 582 | 1758 overlay float calc_pSCR_drop; |
| 623 | 1759 #endif |
| 582 | 1760 |
| 1761 overlay unsigned char status; | |
| 1762 | |
| 1763 | |
| 623 | 1764 assert( 0.00 <= real_N2_ratio && real_N2_ratio <= 1.00 ); |
| 1765 assert( 0.00 <= real_He_ratio && real_He_ratio <= 1.00 ); | |
| 1766 assert( (real_N2_ratio + real_He_ratio) <= 1.00 ); | |
| 604 | 1767 assert( 0.800 < real_pres_respiration && real_pres_respiration < 14.0 ); |
| 1768 | |
| 623 | 1769 assert( 0.00 <= sim_N2_ratio && real_N2_ratio <= 1.00 ); |
| 1770 assert( 0.00 <= sim_He_ratio && real_He_ratio <= 1.00 ); | |
| 1771 assert( (sim_N2_ratio + sim_He_ratio) <= 1.00 ); | |
| 582 | 1772 assert( 0.800 < sim_pres_respiration && sim_pres_respiration < 14.0 ); |
| 1773 | |
| 1774 | |
| 1775 // get input data according to context | |
| 623 | 1776 if( tissue_increment & TISSUE_SELECTOR ) |
| 582 | 1777 { |
| 1778 //---- real tissues ----------------------------------------------------------- | |
| 604 | 1779 calc_pres_respiration = real_pres_respiration; |
| 623 | 1780 |
| 1781 status = main_status; | |
| 604 | 1782 calc_O2_ratio = real_O2_ratio; |
| 1783 calc_N2_ratio = real_N2_ratio; | |
| 623 | 1784 |
| 1785 #ifdef _helium | |
| 604 | 1786 calc_He_ratio = real_He_ratio; |
| 623 | 1787 #endif |
| 1788 | |
| 1789 #ifdef _ccr_pscr | |
| 1790 calc_pSCR_drop = real_pSCR_drop; | |
| 1791 #endif | |
| 582 | 1792 } |
| 1793 else | |
| 1794 { | |
| 1795 //---- simulated tissues ------------------------------------------------------ | |
| 623 | 1796 |
| 640 | 1797 #ifdef _cave_mode |
| 1798 // in cave mode? | |
| 1799 if( !(main_status & CAVE_MODE) ) | |
| 1800 { | |
| 1801 #endif | |
| 1802 | |
| 1803 // (NO) - correct sim_pres_respiration if shallower than calculated stop depth | |
| 1804 calc_pres_respiration = ( real_pres_respiration < sim_pres_respiration ) ? real_pres_respiration : sim_pres_respiration; | |
| 1805 | |
| 1806 #ifdef _cave_mode | |
| 1807 } | |
| 1808 #endif | |
| 1809 | |
| 628 | 1810 |
| 623 | 1811 status = deco_status; |
| 604 | 1812 calc_O2_ratio = sim_O2_ratio; |
| 1813 calc_N2_ratio = sim_N2_ratio; | |
| 623 | 1814 |
| 1815 #ifdef _helium | |
| 604 | 1816 calc_He_ratio = sim_He_ratio; |
| 623 | 1817 #endif |
| 1818 | |
| 1819 #ifdef _ccr_pscr | |
| 1820 calc_pSCR_drop = sim_pSCR_drop; | |
| 1821 #endif | |
| 582 | 1822 } |
| 1823 | |
| 1824 //---- OC, CCR and Bailout Mode Gas Calculations ----------------------------------- | |
| 1825 | |
| 1826 // calculate ppO2 of pure oxygen | |
| 631 | 1827 ppO2_O2 = calc_pres_respiration - ppWater; |
| 604 | 1828 |
| 1829 // capture failure condition in case real_pres_respiration is < ppWater (should never happen...) | |
| 631 | 1830 if( ppO2_O2 < 0.0 ) ppO2_O2 = 0.0; |
| 582 | 1831 |
| 602 | 1832 // calculate ppO2 of the pure gas (OC, diluent) |
| 631 | 1833 ppO2_OC = ppO2_O2 * calc_O2_ratio; |
| 582 | 1834 |
| 623 | 1835 #ifdef _ccr_pscr |
| 1836 | |
| 582 | 1837 // calculate pSCR ppO2 |
| 631 | 1838 ppO2_pSCR = ppO2_OC - calc_pSCR_drop; |
| 1839 | |
| 1840 // capture failure condition in case ppO2_pSCR becomes negative | |
| 1841 if( ppO2_pSCR < 0.0 ) ppO2_pSCR = 0.0; | |
| 582 | 1842 |
| 1843 | |
| 1844 //---- Loop modes : adjust ppN2 and ppHe for change in ppO2 due to setpoint (CCR) or drop (pSCR) --- | |
| 623 | 1845 if( status & MODE_LOOP ) |
| 582 | 1846 { |
| 1847 overlay float const_ppO2; | |
| 604 | 1848 overlay float max_ppO2; |
| 582 | 1849 |
| 1850 // get the current sensor reading (CCR / pSCR if fitted) or the fixed setpoint (CCR) / a zero (pSCR) | |
| 1851 const_ppO2 = 0.01 * char_I_const_ppO2; | |
| 1852 | |
| 1853 // Limit the setpoint to the maximum physically possible ppO2. This prevents for | |
| 1854 // example calculating with a setpoint of 1.3 bar in only 2 meters of depth. | |
| 604 | 1855 // Additionally, the ppO2 can be further reduced to account for exhaled inert gases |
| 623 | 1856 // accumulating in the loop by the user-adjustable setting char_I_CC_max_frac_O2. |
| 604 | 1857 // (ppWater is neglected here) |
| 623 | 1858 max_ppO2 = 0.01 * char_I_CC_max_frac_O2 * calc_pres_respiration; |
| 604 | 1859 |
| 1860 if( const_ppO2 > max_ppO2 ) const_ppO2 = max_ppO2; | |
| 582 | 1861 |
| 1862 // check which kind of loop we are on | |
| 623 | 1863 if( status & MODE_PSCR ) |
| 560 | 1864 { |
| 582 | 1865 //---- pSCR Mode -------------------------------------------------------------------------- |
| 1866 | |
| 631 | 1867 // Use the sensor value if available and in real tissue context, else use calculated ppO2. |
| 1868 ppO2 = ( char_I_const_ppO2 && (tissue_increment & TISSUE_SELECTOR)) ? const_ppO2 : ppO2_pSCR; | |
| 582 | 1869 } |
| 560 | 1870 else |
| 1871 { | |
| 582 | 1872 //---- CCR Mode --------------------------------------------------------------------------- |
| 1873 | |
| 604 | 1874 // derive breathed ppO2 from (char_I_)const_ppO2, which holds sensor reading or selected setpoint |
| 582 | 1875 ppO2 = const_ppO2; |
| 560 | 1876 } |
| 1877 | |
| 604 | 1878 // adjust overall gas pressure for change in ppO2 due to setpoint (CCR) or drop (pSCR), |
| 1879 // capture potential failure conditions first: | |
| 1880 if( ( calc_pres_respiration < ppO2 ) // sensor reading or selected setpoint is higher than ambient pressure | |
| 623 | 1881 || ( calc_O2_ratio > 0.995 ) ) // diluent is pure O2, i.e. calc_N2_ratio + calc_He_ratio = 0 would give a div/0 |
| 560 | 1882 { |
| 604 | 1883 // failure condition present, set predetermined result |
| 1884 calc_pres_respiration = 0.0; | |
| 1885 } | |
| 1886 else | |
| 1887 { | |
| 1888 // no failure conditions present, equation can be executed | |
| 1889 calc_pres_respiration -= ppO2; | |
| 623 | 1890 #ifdef _helium |
| 604 | 1891 calc_pres_respiration /= calc_N2_ratio + calc_He_ratio; |
| 623 | 1892 #else |
| 1893 calc_pres_respiration /= calc_N2_ratio; | |
| 1894 #endif | |
| 560 | 1895 } |
| 582 | 1896 } |
| 1897 else | |
| 623 | 1898 #endif // _ccr_pscr |
| 604 | 1899 { |
| 1900 //---- OC mode --------------------------------------------------------------------------------- | |
| 582 | 1901 |
| 1902 // breathed ppO2 is ppO2 of pure gas | |
| 631 | 1903 ppO2 = ppO2_OC; |
| 560 | 1904 } |
| 1905 | |
| 582 | 1906 |
| 604 | 1907 //---- derive char_ppO2 in [cbar], used for calculating CNS% --------------------------------------- |
| 1908 | |
| 582 | 1909 if ( ppO2 < 0.01 ) char_ppO2 = 0; |
| 1910 else if ( ppO2 >= 2.545 ) char_ppO2 = 255; | |
| 1911 else char_ppO2 = (unsigned char)(100 * ppO2 + 0.5); | |
| 1912 | |
| 1913 | |
| 1914 //---- calculate ppN2 and ppHe --------------------------------------------------------------------- | |
| 1915 | |
| 604 | 1916 // compute ppN2 and ppHe, capture potential failure conditions first: |
| 1917 if( calc_pres_respiration > ppWater ) | |
| 582 | 1918 { |
| 604 | 1919 // subtract water vapor pressure |
| 1920 calc_pres_respiration -= ppWater; | |
| 1921 | |
| 1922 // calculate partial pressures | |
| 1923 ppN2 = calc_N2_ratio * calc_pres_respiration; | |
| 623 | 1924 |
| 1925 #ifdef _helium | |
| 604 | 1926 ppHe = calc_He_ratio * calc_pres_respiration; |
| 623 | 1927 #else |
| 1928 ppHe = 0.0; | |
| 1929 #endif | |
| 1930 | |
| 582 | 1931 } |
| 1932 else | |
| 1933 { | |
| 604 | 1934 // calculated respired pressure is < water vapor pressure, thus set ppN2 and ppHe to 0 |
| 582 | 1935 ppN2 = 0.0; |
| 1936 ppHe = 0.0; | |
| 1937 } | |
| 628 | 1938 |
| 634 | 1939 #ifdef _ccr_pscr |
| 628 | 1940 // calculating real tissues? |
| 1941 if( tissue_increment & TISSUE_SELECTOR ) | |
| 1942 { | |
| 1943 overlay unsigned char temp; | |
| 1944 | |
| 1945 // compute gas density of current mix in multiples of 0.01 grams per liter | |
| 1946 int_O_gas_density = (unsigned int)( 17.9 * ppHe + 125.1 * ppN2 + 142.8 * ppO2 ); | |
| 1947 | |
| 634 | 1948 // convert gas density into an 8 bit integer, scaling 0.1 grams per liter |
| 628 | 1949 temp = (unsigned char)( (int_O_gas_density + 9) / 10 ); |
| 1950 | |
| 1951 // limit to display max and set warning or attention flag | |
| 634 | 1952 if( temp > 99 ) int_O_gas_density = 999 | INT_FLAG_WARNING; |
| 1953 else if( temp >= char_I_gas_density_warn ) int_O_gas_density |= INT_FLAG_WARNING; | |
| 1954 else if( temp >= char_I_gas_density_att ) int_O_gas_density |= INT_FLAG_ATTENTION; | |
| 628 | 1955 } |
| 1956 #endif | |
| 0 | 1957 } |
| 1958 | |
| 604 | 1959 |
| 0 | 1960 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 1961 // Initializes all output variables to their default values |
| 1962 // | |
| 1963 static void init_output_vars(void) | |
| 1964 { | |
| 1965 // clear the internal stops table from remains lasting from the previous dive or deco calculator run | |
| 1966 clear_deco_table(); | |
| 1967 | |
| 1968 // publish the cleared stops table to the display functions | |
| 1969 publish_deco_table(); | |
| 1970 | |
| 1971 // clear the published gas needs in volume and pressure | |
| 1972 for( i = 0; i < NUM_GAS; ++i ) | |
| 1973 { | |
| 1974 int_O_gas_need_vol[i] = 0; | |
| 1975 int_O_gas_need_pres[i] = 0 + INT_FLAG_ZERO + INT_FLAG_INVALID; | |
| 1976 } | |
| 1977 | |
| 1978 // values initially to be set to zero | |
| 1979 int_O_ceiling = 0; // ceiling depth in mbar | |
| 1980 char_O_deco_info = 0; // clear all deco information flags | |
| 1981 char_O_deco_warnings = 0; // clear all deco warning flags | |
| 1982 | |
| 1983 // default desaturation time to 24 hours (it will not be computed during a dive) | |
| 1984 int_O_desaturation_time = 1440; | |
| 1985 | |
| 1986 // initialize CNS values | |
| 1987 int_O_CNS_norm = 0 + INT_FLAG_INVALID; | |
| 1988 int_O_CNS_alt = 0 + INT_FLAG_INVALID; | |
| 1989 | |
| 1990 // initialize NDL times | |
| 631 | 1991 int_O_NDL_norm = 240; |
| 1992 int_O_NDL_alt = 240; | |
| 1993 | |
| 1994 // initialize stop times | |
| 1995 int_O_TST_norm = 0; | |
| 1996 int_O_TST_alt = 0 + INT_FLAG_INVALID + INT_FLAG_NOT_COMPUTED_YET + INT_FLAG_ZERO; | |
| 1997 | |
| 1998 | |
| 1999 // initialize ascent / return times | |
| 623 | 2000 int_O_TTS_norm = 0; |
| 2001 int_O_TTS_alt = 0 + INT_FLAG_INVALID + INT_FLAG_NOT_COMPUTED_YET; | |
| 2002 | |
| 2003 #ifdef _rx_functions | |
| 2004 // clear TR values | |
| 2005 int_O_SAC_measured = 0 + INT_FLAG_NOT_AVAIL; // SAC rate | |
| 2006 int_O_pressure_need[0] = 0 + INT_FLAG_NOT_AVAIL; // pressure need to reading 1 | |
| 2007 int_O_pressure_need[1] = 0 + INT_FLAG_NOT_AVAIL; // pressure need to reading 2 | |
| 628 | 2008 int_O_tank_pressure = 0; // tank pressure for logging |
| 623 | 2009 #endif |
| 2010 | |
| 628 | 2011 #ifdef _helium |
| 2012 int_O_gas_density = 0; | |
| 2013 #endif | |
| 2014 | |
| 2015 // also clear any time++ request | |
| 2016 char_I_sim_advance_time = 0; | |
| 623 | 2017 } |
| 2018 | |
| 2019 | |
| 2020 ////////////////////////////////////////////////////////////////////////////// | |
| 2021 // Reset all tissues to surface pressure equilibrium state | |
| 2022 // | |
| 2023 // Input: int_I_pres_surface current surface pressure in hPa (mbar) | |
| 2024 // | |
| 2025 // Output: real_pres_tissue_N2[] partial pressure of N2 in real tissues | |
| 2026 // real_pres_tissue_He[] partial pressure of He in real tissues | |
| 2027 // char_O_tissue_pres_N2[] partial pressure of N2 for tissue graphics | |
| 2028 // char_O_tissue_pres_He[] partial pressure of He for tissue graphics | |
| 2029 // char_O_tissue_pressure[] total pressure for tissue graphics | |
| 2030 // CNS_fraction_real internal CNS value | |
| 2031 // int_O_CNS_current current CNS value | |
| 2032 // int_O_CNS_norm CNS value at end of normal dive plan | |
| 2033 // int_O_CNS_alt CNS value at end of alternative dive plan | |
| 2034 // char_O_deco_warnings deco warnings vector | |
| 631 | 2035 // int_O_NDL_norm remaining NDL time in normal dive plan |
| 2036 // int_O_NDL_alt remaining NDL time in alternative dive plan | |
| 623 | 2037 // int_O_TTS_norm ascent time (TTS) in normal dive plan |
| 2038 // int_O_TTS_alt ascent time (TTS) in alternative dive plan | |
| 2039 // int_O_lead_supersat supersaturation of the leading tissue | |
| 0 | 2040 // |
| 2041 static void clear_tissue(void) | |
| 2042 { | |
| 623 | 2043 // safeguard and convert the surface pressure (mbar -> bar) (*) |
| 2044 if( int_I_pres_surface < 500 ) pres_surface = 0.500; | |
| 2045 else pres_surface = 0.001 * int_I_pres_surface; | |
| 2046 | |
| 2047 // calculate partial pressure of N2 in respired air at surface pressure | |
| 2048 calc_N2_equilibrium(); | |
| 2049 | |
| 2050 // cycle through the 16 Buhlmann tissues | |
| 604 | 2051 for( ci = 0; ci < NUM_COMP; ci++ ) |
| 582 | 2052 { |
| 623 | 2053 // reset tissue pressures |
| 2054 real_pres_tissue_He[ci] = 0.0; // He | |
| 2055 real_pres_tissue_N2[ci] = N2_equilibrium; // N2 | |
| 2056 | |
| 629 | 2057 // reset tissue pressures for scaled tissue graphics |
| 631 | 2058 char_O_tissue_pres_He[ci] = 0; // He |
| 623 | 2059 char_O_tissue_pres_N2[ci] = 10; // N2 |
| 2060 char_O_tissue_pressure[ci] = 10; // combined | |
| 582 | 2061 } |
| 2062 | |
| 2063 // reset CNS values | |
| 623 | 2064 CNS_fraction_real = 0.0; |
| 2065 int_O_CNS_current = int_O_CNS_norm = int_O_CNS_alt = 0; | |
| 582 | 2066 |
| 2067 // reset some more vars to their defaults | |
| 631 | 2068 int_O_NDL_norm = 240; |
| 2069 int_O_NDL_alt = 240; | |
| 2070 int_O_TST_norm = 0; | |
| 2071 int_O_TST_alt = 0 + INT_FLAG_ZERO; | |
| 2072 int_O_TTS_norm = 0; | |
| 2073 int_O_TTS_alt = 0; | |
| 2074 int_O_lead_supersat = 0; | |
| 623 | 2075 |
| 2076 // reset all warning and info flags | |
| 631 | 2077 char_O_deco_warnings = 0; |
| 2078 char_O_deco_info = 0; | |
| 0 | 2079 } |
| 2080 | |
| 582 | 2081 |
| 0 | 2082 ////////////////////////////////////////////////////////////////////////////// |
| 628 | 2083 // Deco engine main code |
| 0 | 2084 // |
| 623 | 2085 // This is the major code in dive mode, it calculates the tissue pressures, |
| 2086 // the bottom time, and it calculates the ascend with all deco stops, etc. | |
| 2087 // | |
| 2088 // Input: char_O_main_status deco engine control and real tissues mode | |
| 2089 // char_O_deco_status deco engine control and simulated tissues mode | |
| 2090 // char_I_sim_advance_time mailbox for bottom time incrementing | |
| 2091 // | |
| 2092 // char_I_SAC_work gas usage rate during working phase in l/min | |
| 2093 // char_I_SAC_deco gas usage rate during deco stops phase in l/min | |
| 2094 // | |
| 631 | 2095 // char_I_model selector for GF extension |
| 623 | 2096 // char_I_saturation_multiplier safety factor for tissue saturation |
| 2097 // char_I_desaturation_multiplier safety factor for tissue desaturation | |
| 2098 // | |
| 631 | 2099 // char_I_pressure_gas[] amount of gas available for ascent / cave return in bar |
| 623 | 2100 // int_I_pressure_drop[] pressure drop used to calculate SAC rate |
| 2101 // char_I_gas_avail_size[] size of the tanks in liters | |
| 2102 // | |
| 2103 // Output: int_O_O2_ppO2 partial pressure of pure O2 at current depth | |
| 2104 // int_O_pure_ppO2 partial pressure of O2 in gas at current depth | |
| 2105 // int_O_pSCR_ppO2 partial pressure of O2 in gas at current depth, corrected for pSCR mode | |
| 2106 // int_O_breathed_ppO2 partial pressure of O2 currently breathed | |
| 2107 // | |
| 2108 // char_O_deco_status deco engine computations status | |
| 2109 // char_O_deco_info deco engine information vector | |
| 2110 // char_O_deco_warnings deco engine warnings vector | |
| 2111 // | |
| 631 | 2112 // int_O_NDL_norm remaining NDL time in normal dive plan |
| 2113 // int_O_NDL_alt remaining NDL time in alternative dive plan | |
| 623 | 2114 // int_O_TTS_norm ascent time (TTS) in normal dive plan |
| 2115 // int_O_TTS_alt ascent time (TTS) in alternative dive plan | |
| 2116 // int_O_CNS_norm CNS value at end of normal dive plan | |
| 2117 // int_O_CNS_alt CNS value at end of alternative dive plan | |
| 2118 // | |
| 631 | 2119 // int_O_gas_need_vol[] calculated gas volumes needed for ascent / cave return |
| 2120 // int_O_gas_need_pres[] calculated gas pressures needed for ascent / cave return | |
| 623 | 2121 // |
| 2122 // int_O_SAC_measured measured surface air consumption (SAC) rate in l/min | |
| 2123 // | |
| 2124 // Modified: int_IO_pressure_value[] warning flags added to pressure reading 1 & 2 | |
| 2125 // int_IO_pressure_need[] pressure needs to pressure reading 1 & 2 | |
| 0 | 2126 // |
| 2127 static void calc_hauptroutine(void) | |
| 2128 { | |
| 623 | 2129 overlay unsigned short int_ppO2_min; |
| 628 | 2130 overlay unsigned short int_ppO2_max_warn; |
| 2131 overlay unsigned short int_ppO2_max_att; | |
| 623 | 2132 overlay unsigned short int_ppO2_max_dil; |
| 631 | 2133 overlay float EAD_pres; |
| 2134 overlay float END_pres; | |
| 623 | 2135 |
| 2136 //============================================================================================= | |
| 2137 | |
| 2138 // | |
| 2139 //--- Setup Part --------------------------------------------------------------------------------- | |
| 2140 // | |
| 2141 | |
| 2142 // set time limit for preempting deco calculations, timer is 16 bit and increments every 1/32 ms | |
| 2143 tmr5_value = 65535 - (32 * BUDGET_PER_SECOND / INVOKES_PER_SECOND); | |
| 2144 | |
| 2145 // load timer | |
| 2146 load_tmr5(); | |
| 2147 | |
| 2148 // read command flags and set up what to do | |
| 2149 switch( char_O_deco_status & COMMAND_MASK ) | |
| 560 | 2150 { |
| 623 | 2151 |
| 2152 case INITIALIZE: | |
| 2153 case INITIALIZE_START_NORM: | |
| 2154 case INITIALIZE_START_ALT: | |
| 2155 | |
| 2156 // copy master modes to shadow registers | |
| 2157 main_status = char_O_main_status; | |
| 2158 deco_status = char_O_deco_status; | |
| 2159 | |
| 2160 // clear all command flags on the master mode to signal that the command is read | |
| 2161 char_O_deco_status &= ~COMMAND_MASK; | |
| 2162 | |
| 2163 // clear the initialization flag on the shadow copy | |
| 2164 deco_status &= ~INITIALIZE; | |
| 2165 | |
| 2166 // initialize the sequence timer | |
| 2167 sequence_timer = 0; | |
| 2168 | |
| 2169 // set the calculation phase to start with to doing the once-per-dive initialization | |
| 2170 next_planning_phase = PHASE_10_DIVE_INIT; | |
| 2171 | |
| 2172 break; | |
| 2173 | |
| 2174 | |
| 2175 case START_NORM: | |
| 2176 case START_ALT: | |
| 2177 | |
| 2178 // copy master modes to shadow registers | |
| 2179 main_status = char_O_main_status; | |
| 2180 deco_status = char_O_deco_status; | |
| 2181 | |
| 2182 // clear all command flags on the master mode to signal that the command is read | |
| 2183 char_O_deco_status &= ~COMMAND_MASK; | |
| 2184 | |
| 2185 // set the calculation phase to start with to doing the cyclic initialization | |
| 628 | 2186 next_planning_phase = PHASE_20_CYCLIC_INIT; |
| 623 | 2187 |
| 2188 // continue in CALCULATING | |
| 2189 | |
| 2190 | |
| 2191 case CALCULATING: | |
| 2192 | |
| 2193 // keep current calculation phase | |
| 2194 | |
| 2195 // step the sequence timer | |
| 2196 sequence_timer = (sequence_timer < INVOKES_PER_SECOND * 2 - 1) ? sequence_timer + 1 : 0; | |
| 2197 | |
| 2198 break; | |
| 560 | 2199 } |
| 2200 | |
| 582 | 2201 |
| 623 | 2202 // |
| 2203 //--- End of Setup Part ----------------------------------------------------------------------- | |
| 2204 // | |
| 2205 | |
| 2206 //============================================================================================= | |
| 2207 | |
| 2208 // | |
| 2209 //---- Calculations Part (real Tissues) ------------------------------------------------------- | |
| 2210 // | |
| 2211 | |
| 582 | 2212 |
| 604 | 2213 // target the real tissues with 2 second increments by default |
| 623 | 2214 tissue_increment = TISSUE_SELECTOR | 0; |
| 2215 | |
| 2216 | |
| 2217 // Tasks every second, if more than 1 invocation per second: on the first section of the second. | |
| 2218 // Requests for tissue "fast forward" are executed immediately. | |
| 2219 #if (INVOKES_PER_SECOND > 1) | |
| 2220 if( ( sequence_timer == 0 ) | |
| 2221 || ( sequence_timer == INVOKES_PER_SECOND ) | |
| 2222 || ( char_I_sim_advance_time > 0 ) | |
| 2223 ) | |
| 2224 #endif | |
| 584 | 2225 { |
| 623 | 2226 // acquire current environmental data |
| 2227 calc_hauptroutine_data_input(); | |
| 2228 | |
| 628 | 2229 // calculate ppO2, ppN2 and ppHe for real tissues |
| 623 | 2230 calc_alveolar_pressures(); |
| 2231 | |
| 2232 // add decent calculation here and include trigger in above if-statement | |
| 2233 // TODO | |
| 2234 | |
| 2235 } // tasks every second, on the first section of the second | |
| 2236 | |
| 2237 | |
| 2238 // Tasks every 2 seconds, on the first section of the respective second. | |
| 2239 // Requests for tissue "fast forward" are executed immediately. | |
| 2240 if( ( sequence_timer == 0 ) | |
| 2241 || ( char_I_sim_advance_time > 0 ) | |
| 2242 ) | |
| 2243 { | |
| 2244 // Tissue and CNS updates are based on 2 seconds periods! | |
| 2245 | |
| 604 | 2246 // Set up normal tissue updating or "fast forward" updating for simulator |
| 2247 // sim+5' function and deco calculator bottom time calculation. | |
| 2248 if( char_I_sim_advance_time > 0 ) | |
| 2249 { | |
| 2250 // configure "fast forward" tissue updating | |
| 623 | 2251 tissue_increment = TISSUE_SELECTOR | char_I_sim_advance_time; |
| 2252 | |
| 2253 // clear the request | |
| 604 | 2254 char_I_sim_advance_time = 0; |
| 2255 } | |
| 2256 | |
| 584 | 2257 // calculate the real tissues |
| 2258 calc_tissues(); | |
| 2259 | |
| 604 | 2260 // update the CNS value for the real tissues |
| 2261 calc_CNS(); | |
| 2262 | |
| 2263 // calculate ceiling (at GF_high or 100%) and leading tissue supersaturation | |
| 631 | 2264 if ( char_I_model ) calc_limit(GF_high); // GF factors enabled |
| 2265 else calc_limit( 1.0 ); // classic Buhlmann | |
| 623 | 2266 |
| 2267 // convert the ceiling value to integer | |
| 604 | 2268 convert_ceiling_for_display(); |
| 2269 | |
| 623 | 2270 // convert the saturation value of the leading tissue to integer |
| 2271 convert_sat_for_display(); | |
| 2272 | |
| 2273 // convert the CNS value to integer | |
| 2274 convert_cur_CNS_for_display(); | |
| 2275 | |
| 2276 } // tasks every 2 seconds | |
| 2277 | |
| 2278 | |
| 2279 // Tasks every second, if more than 1 invocation per second: on the first section of the second. | |
| 2280 #if (INVOKES_PER_SECOND > 1) | |
| 2281 if( ( sequence_timer == 0 ) | |
| 2282 || ( sequence_timer == INVOKES_PER_SECOND ) | |
| 2283 ) | |
| 2284 #endif | |
| 582 | 2285 { |
| 623 | 2286 //---- Calculate and Export EAD and END ------------------------------------------------------ |
| 2287 | |
| 631 | 2288 // calculate EAD (Equivalent Air Depth) as pressure in [bar]: |
| 2289 // equivalent depth for the same N2 level with plain air | |
| 2290 EAD_pres = ppN2 / 0.7902 + ppWater - pres_surface; | |
| 2291 | |
| 2292 // calculate END (Equivalent Narcotic Depth) as pressure in [bar]: | |
| 2293 // as before, but with O2 treated as narcotic, too | |
| 2294 // Source: The Physiology and Medicine of Diving by Peter Bennett and David Elliott, | |
| 2295 // 4th edition, 1993, W.B.Saunders Company Ltd, London. | |
| 2296 END_pres = real_pres_respiration - ppHe - pres_surface; | |
| 2297 | |
| 2298 | |
| 2299 // export EAD, factor 10 is because conversion delivers in [cbar] but we need [mbar] | |
| 2300 float_value = EAD_pres; convert_float_to_int(); int_O_EAD_pres = int_value * 10; | |
| 2301 | |
| 2302 // export END, factor 10 is because conversion delivers in [cbar] but we need [mbar] | |
| 2303 float_value = END_pres; convert_float_to_int(); int_O_END_pres = int_value * 10; | |
| 623 | 2304 |
| 2305 | |
| 2306 //---- Compute ppO2 Values in [cbar] --------------------------------------------------------- | |
| 2307 | |
| 2308 float_value = ppO2; convert_float_to_int(); int_O_breathed_ppO2 = int_value; // breathed gas | |
| 2309 #ifdef _ccr_pscr | |
| 631 | 2310 float_value = ppO2_O2; convert_float_to_int(); int_O_O2_ppO2 = int_value; // pure oxygen |
| 2311 float_value = ppO2_OC; convert_float_to_int(); int_O_pure_ppO2 = int_value; // pure gas | |
| 2312 float_value = ppO2_pSCR; convert_float_to_int(); int_O_pSCR_ppO2 = int_value; // pSCR calculated | |
| 623 | 2313 #endif |
| 2314 | |
| 2315 | |
| 628 | 2316 //---- Set/Clear Deco Mode ------------------------------------------------------------------ |
| 2317 | |
| 2318 // Clear the deco mode flag if: | |
| 2319 // deco mode is set | |
| 2320 // AND we are deeper than 7 meters below the deepest deco stop | |
| 2321 // (7 meters chosen as to be 2 stop depth intervals plus 1 additional meter below) | |
| 2322 if ( ( deco_info & DECO_MODE ) > 0 ) | |
| 2323 if ( ( char_depth_real ) > char_O_deco_depth[0] + 7 ) | |
| 631 | 2324 deco_info &= ~DECO_MODE; |
| 623 | 2325 |
| 2326 // Set the deco mode flag if: | |
| 2327 // deco mode is not set | |
| 2328 // AND breathing an OC deco gas (gas type 3) | |
| 2329 // OR breathing a gas or diluent that officially is disabled (type 0) | |
| 628 | 2330 // OR there is a deco stop |
| 631 | 2331 // |
| 2332 // Remark: when breathing a gas, its lost & staged flags are cleared | |
| 2333 // | |
| 628 | 2334 if ( ( deco_info & DECO_MODE ) == 0 ) |
| 2335 if ( ( char_I_current_gas_type == 3 ) | |
| 2336 || ( char_I_current_gas_type == 0 ) | |
| 2337 || ( char_O_deco_depth[0] > 0 ) | |
| 623 | 2338 ) |
| 631 | 2339 deco_info |= DECO_MODE; |
| 623 | 2340 |
| 2341 | |
| 2342 //---- Compute ppO2 Warnings ------------------------------------------------------------------ | |
| 2343 | |
| 628 | 2344 // compute conditional min value |
| 623 | 2345 #ifdef _ccr_pscr |
| 2346 int_ppO2_min = ( main_status & MODE_LOOP ) ? (unsigned short)char_I_ppO2_min_loop : (unsigned short)char_I_ppO2_min; | |
| 2347 #else | |
| 2348 int_ppO2_min = (unsigned short)char_I_ppO2_min; | |
| 2349 #endif | |
| 2350 | |
| 628 | 2351 // determine the absolute max value (should be the deco one, but who knows...) |
| 2352 int_ppO2_max_warn = ( char_I_ppO2_max_work > char_I_ppO2_max_deco) ? char_I_ppO2_max_work : char_I_ppO2_max_deco; | |
| 2353 | |
| 2354 // add some margin to compensate for surface pressures > 1.000 mbar | |
| 2355 int_ppO2_max_warn += ppO2_MARGIN_ON_MAX; | |
| 2356 | |
| 2357 // determine the normal max value | |
| 2358 int_ppO2_max_att = ( deco_info & DECO_MODE ) ? (unsigned short)char_I_ppO2_max_deco : (unsigned short)char_I_ppO2_max_work; | |
| 2359 | |
| 2360 // add some margin to compensate for surface pressures > 1.000 mbar | |
| 2361 int_ppO2_max_att += ppO2_MARGIN_ON_MAX; | |
| 623 | 2362 |
| 2363 #ifdef _ccr_pscr | |
| 628 | 2364 // default value for the upper diluent ppO2 warning threshold is the upper warning threshold |
| 2365 int_ppO2_max_dil = int_ppO2_max_warn; | |
| 2366 | |
| 2367 // when enabled and in CCR mode, the upper diluent warning threshold gets adjust according to the current setpoint | |
| 631 | 2368 if( char_I_dil_check ) |
| 623 | 2369 if( (main_status & MODE_MASK) == MODE_CCR ) |
| 2370 { | |
| 2371 overlay unsigned short max_dil; | |
| 2372 | |
| 2373 // The upper diluent ppO2 threshold is ppO2_GAP_TO_SETPOINT below the setpoint... | |
| 2374 // (the condition protects from negative numbers which would cause a wrap-around in unsigned integers) | |
| 2375 max_dil = (char_I_const_ppO2 > ppO2_GAP_TO_SETPOINT) ? (unsigned short)(char_I_const_ppO2 - ppO2_GAP_TO_SETPOINT) : 0; | |
| 2376 | |
| 628 | 2377 // ...but never above int_ppO2_max_warn |
| 2378 if( max_dil < int_ppO2_max_warn ) int_ppO2_max_dil = max_dil; | |
| 623 | 2379 |
| 2380 // We do not need to guard int_ppO2_max_dil against becoming lower than char_I_ppO2_min because the check | |
| 2381 // against char_I_ppO2_min is done first and will then raise a low warning and inhibit further checks. | |
| 2382 } | |
| 2383 #endif | |
| 2384 | |
| 2385 // check for safe range of breathed gas | |
| 628 | 2386 if ( int_O_breathed_ppO2 <= int_ppO2_min ) int_O_breathed_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; |
| 2387 else if ( int_O_breathed_ppO2 >= int_ppO2_max_warn ) int_O_breathed_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; | |
| 2388 else if ( deco_info & DECO_MODE ) ; // no attention generated in deco mode | |
| 2389 else if ( main_status & MODE_LOOP ) ; // no attention generated in loop modes | |
| 2390 else if ( int_O_breathed_ppO2 >= int_ppO2_max_att ) int_O_breathed_ppO2 |= INT_FLAG_ATTENTION; | |
| 623 | 2391 |
| 2392 #ifdef _ccr_pscr | |
| 2393 // check for safe range of pure oxygen | |
| 628 | 2394 if ( int_O_O2_ppO2 >= int_ppO2_max_warn ) int_O_O2_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; |
| 623 | 2395 |
| 2396 // check for safe range of pure diluent | |
| 628 | 2397 if ( int_O_pure_ppO2 <= (unsigned short)char_I_ppO2_min ) int_O_pure_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; |
| 2398 else if ( int_O_pure_ppO2 >= int_ppO2_max_warn ) int_O_pure_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; | |
| 2399 else if ( int_O_pure_ppO2 >= int_ppO2_max_dil ) int_O_pure_ppO2 |= INT_FLAG_ATTENTION; | |
| 623 | 2400 |
| 2401 // check for safe range of calculated pSCR loop gas | |
| 628 | 2402 if ( int_O_pSCR_ppO2 <= int_ppO2_min ) int_O_pSCR_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; |
| 2403 else if ( int_O_pSCR_ppO2 >= int_ppO2_max_warn ) int_O_pSCR_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; | |
| 623 | 2404 #endif |
| 2405 | |
| 2406 } // tasks every second / on the first section of the second | |
| 604 | 2407 |
| 2408 | |
| 2409 #ifdef _rx_functions | |
| 2410 | |
| 623 | 2411 // only when TR functions are enabled |
| 2412 if( main_status & TR_FUNCTIONS ) | |
| 2413 | |
| 2414 // Tasks every second, if more than 1 invocation per second: on the second section of the second. | |
| 2415 #if (INVOKES_PER_SECOND > 1) | |
| 2416 if( ( sequence_timer == 1 ) | |
| 2417 || ( sequence_timer == INVOKES_PER_SECOND + 1 ) | |
| 2418 ) | |
| 2419 #endif | |
| 604 | 2420 { |
| 623 | 2421 calc_TR_functions(); |
| 2422 } | |
| 2423 | |
| 2424 #endif // _rx_functions | |
| 2425 | |
| 2426 | |
| 2427 // | |
| 604 | 2428 //---- End of Computations for the real Tissues ----------------------------------------------- |
| 2429 // | |
| 623 | 2430 |
| 604 | 2431 //============================================================================================= |
| 623 | 2432 |
| 604 | 2433 // |
| 623 | 2434 //---- Begin of Computations for Ascent and Decompression (simulated Tissues) ----------------- |
| 2435 // | |
| 2436 | |
| 2437 // Dispatcher: select what to do based on the current calculation phase | |
| 2438 do | |
| 582 | 2439 { |
| 623 | 2440 |
| 2441 #ifdef _profiling | |
| 2442 profiling_phase = next_planning_phase; | |
| 2443 #endif | |
| 2444 | |
| 2445 switch( next_planning_phase ) | |
| 560 | 2446 { |
| 623 | 2447 |
| 2448 // | |
| 2449 //---- once-per-dive Initialization of the Deco Engine ------------------------------------ | |
| 2450 // | |
| 2451 case PHASE_10_DIVE_INIT: | |
| 2452 | |
| 2453 // initialize all output variables to defaults | |
| 2454 init_output_vars(); | |
| 2455 | |
| 582 | 2456 // initialize values that will be recalculated later on periodically |
| 631 | 2457 deco_warnings = 0; // reset all deco warnings |
| 2458 deco_info = 0; // reset all deco infos | |
| 2459 IBCD_tissue_vector = 0; // reset tissue IBCD vector | |
| 2460 NDL_tissue_start_norm = 0; // initialize the tissue to start with when calculating normal NDL time | |
| 2461 NDL_tissue_start_alt = 0; // initialize the tissue to start with when calculating alternative NDL time | |
| 623 | 2462 |
| 2463 // enforce initialization of GF data on first cyclic initialization | |
| 631 | 2464 GF_high_last = 255; |
| 2465 GF_low_last = 255; | |
| 2466 | |
| 2467 | |
| 2468 // calculate volumes available for each gas | |
| 2469 for( i = 0; i < NUM_GAS; i++ ) | |
| 628 | 2470 { |
| 631 | 2471 // total available volume = tank size * fill press, char_I_gas_avail_pres is in multiples of 10 bar |
| 2472 gas_volume_avail[i] = (float)char_I_gas_avail_size[i] * (float)char_I_gas_avail_pres[i] * 10.0; | |
| 2473 | |
| 2474 // attention threshold | |
| 2475 gas_volume_atten[i] = gas_volume_avail[i] * GAS_NEEDS_ATTENTION; | |
| 628 | 2476 } |
| 631 | 2477 |
| 623 | 2478 |
| 2479 #ifdef _profiling | |
| 2480 int_O_profiling_overrun_max = 0; | |
| 2481 char_O_profiling_runs_norm = 0; | |
| 2482 char_O_profiling_runs_alt = 0; | |
| 2483 #endif | |
| 2484 | |
| 2485 | |
| 2486 // the next calculation phase will do the cyclic initialization of the deco engine if a | |
| 2487 // normal or alternative plan shall be calculated, else the calculation cycle is done. | |
| 628 | 2488 if( deco_status & PLAN_MASK ) next_planning_phase = PHASE_20_CYCLIC_INIT; |
| 623 | 2489 else next_planning_phase = PHASE_00_DONE; |
| 2490 | |
| 2491 break; | |
| 2492 | |
| 582 | 2493 |
| 2494 // | |
| 628 | 2495 //---- once-per-cycle Initialization of the Deco Engine ----------------------------------- |
| 582 | 2496 // |
| 628 | 2497 case PHASE_20_CYCLIC_INIT: |
| 623 | 2498 |
| 2499 // target the simulated tissues (flag bit 7 = 0) | |
| 2500 tissue_increment = 0; | |
| 2501 | |
| 2502 // clear the internal stops table | |
| 582 | 2503 clear_deco_table(); |
| 604 | 2504 |
| 631 | 2505 // clear deco stops info |
| 2506 if( deco_status & CALC_NORM ) deco_info &= ~DECO_STOPS_NORM; | |
| 2507 else deco_info &= ~DECO_STOPS_ALT; | |
| 2508 | |
| 560 | 2509 // initialize the simulated tissues with the current state of the real tissues |
| 604 | 2510 for( i = 0; i < NUM_COMP; i++ ) |
| 560 | 2511 { |
| 623 | 2512 sim_pres_tissue_N2[i] = real_pres_tissue_N2[i]; |
| 2513 sim_pres_tissue_He[i] = real_pres_tissue_He[i]; | |
| 582 | 2514 } |
| 2515 | |
| 631 | 2516 // initialize the gas types |
| 2517 for( i = 0; i < NUM_GAS; i++ ) | |
| 2518 { | |
| 2519 deco_gas_type[i] = char_I_deco_gas_type[i]; | |
| 2520 } | |
| 2521 | |
| 2522 #ifdef _gas_contingency | |
| 2523 // if in gas contingency mode, | |
| 2524 // check if there are multiple tanks with the same gas | |
| 2525 // (or at least with the same change depth...) | |
| 2526 if( main_status & GAS_CONTINGENCY ) | |
| 2527 { | |
| 2528 for( i = 0; i < NUM_GAS; i++ ) | |
| 2529 { | |
| 2530 // default to no peer tanks existing | |
| 2531 peer_tank[i] = 0; | |
| 2532 | |
| 2533 // tank enabled? | |
| 2534 if( char_I_deco_gas_type[i] ) | |
| 2535 { | |
| 2536 // YES - check for peer tanks | |
| 2537 for( j = 0; j < NUM_GAS; j++ ) | |
| 2538 { | |
| 2539 // do not check a tank against itself | |
| 2540 if( i == j ) continue; | |
| 2541 | |
| 2542 // is the other tank also enabled and does it have the same change depth? | |
| 2543 if( char_I_deco_gas_type[j] & GAS_TYPE_MASK ) | |
| 2544 if( char_I_deco_gas_change[i] == char_I_deco_gas_change[j] ) | |
| 2545 { | |
| 2546 // YES - memorize it as a peer tank | |
| 2547 peer_tank[i] |= (1 << j); | |
| 2548 } | |
| 2549 } | |
| 2550 } | |
| 2551 } | |
| 2552 } | |
| 2553 #endif | |
| 2554 | |
| 623 | 2555 // initialize GF parameters if using GF model |
| 631 | 2556 if( char_I_model != 0 ) |
| 604 | 2557 { |
| 623 | 2558 // update GF parameters (GFs may have been switched between GF and aGF) |
| 628 | 2559 if( (char_I_GF_Low_percentage != GF_low_last) || (char_I_GF_High_percentage != GF_high_last) ) |
| 604 | 2560 { |
| 623 | 2561 // store new values in integer format |
| 628 | 2562 GF_low_last = char_I_GF_Low_percentage; |
| 623 | 2563 GF_high_last = char_I_GF_High_percentage; |
| 628 | 2564 |
| 2565 // safeguard and store new values in float format | |
| 2566 GF_low = ( GF_low_last > 10 ) ? 0.01 * GF_low_last : 0.10 ; | |
| 2567 GF_high = ( GF_high_last > GF_low_last ) ? 0.01 * GF_high_last : GF_low; | |
| 2568 | |
| 623 | 2569 |
| 2570 // reset low depth references and slopes | |
| 631 | 2571 GF_depth_norm = 0; |
| 2572 GF_depth_alt = 0; | |
| 2573 GF_slope_norm = 0.0; | |
| 2574 GF_slope_alt = 0.0; | |
| 604 | 2575 } |
| 623 | 2576 |
| 2577 // retrieve GF parameters for current calculation cycle | |
| 2578 if( deco_status & CALC_NORM ) | |
| 560 | 2579 { |
| 631 | 2580 GF_depth = GF_depth_norm; |
| 2581 GF_slope = GF_slope_norm; | |
| 560 | 2582 } |
| 2583 else | |
| 2584 { | |
| 631 | 2585 GF_depth = GF_depth_alt; |
| 2586 GF_slope = GF_slope_alt; | |
| 560 | 2587 } |
| 604 | 2588 } |
| 2589 | |
| 623 | 2590 // initialize the simulated CNS value with the current CNS value of the real tissues |
| 2591 CNS_fraction_sim = CNS_fraction_real; | |
| 2592 | |
| 631 | 2593 // initialize the simulated pressure with the current real pressure |
| 623 | 2594 sim_pres_respiration = real_pres_respiration; |
| 631 | 2595 |
| 2596 // initialize the simulated depth with the current real depth | |
| 2597 char_depth_sim = char_depth_start = char_depth_real; | |
| 2598 | |
| 2599 // cache the gas/dil to start calculations with | |
| 2600 start_gas_num = char_I_current_gas_num; | |
| 2601 | |
| 623 | 2602 |
| 2603 // Lookup the gas that is currently breathed with the real tissues and set it as | |
| 2604 // the gas to be used with the simulated tissues, too. This gas will be used until | |
| 628 | 2605 // gas_find_best()/gas_take_best() is invoked and switches to a better gas. |
| 2606 gas_take_current(); | |
| 2607 | |
| 2608 // Setup the calculation ratio's for N2, He and O2 (sim_N2/He/_O2_ratio). | |
| 2609 // These ratios can be kept until a gas switch is done. Thus, if a call to | |
| 2610 // gas_find_best() has found a better gas and this gas is taken by a call | |
| 2611 // to gas_take_best(), gas_set_ratios() needs to be called again. | |
| 623 | 2612 gas_set_ratios(); |
| 2613 | |
| 2614 // compute ppO2, ppN2 and ppHe for current depth from sim_pres_respiration | |
| 2615 calc_alveolar_pressures(); | |
| 2616 | |
| 2617 // initialize the no decompression limit (NDL) time to 240 minutes | |
| 2618 NDL_time = 240; | |
| 2619 | |
| 631 | 2620 // clear the Total Time to Surface (TTS) and the Total Stops Time (TST) |
| 2621 TTS_time = 0; | |
| 2622 TST_time = 0; | |
| 628 | 2623 |
| 623 | 2624 // retrieve the tissue that had the shortest NDL time during last calculation |
| 2625 NDL_tissue_start = ( deco_status & CALC_NORM ) ? NDL_tissue_start_norm : NDL_tissue_start_alt; | |
| 2626 | |
| 2627 // start calculating NDL time with the tissue that had the shortest NDL last time | |
| 2628 NDL_tissue = NDL_tissue_start; | |
| 2629 NDL_tissue_lead = NDL_tissue_start; | |
| 2630 | |
| 631 | 2631 // initialization for convert_volume_to_pressure() |
| 2632 gas_needs_gas_index = 0; | |
| 2633 | |
| 2634 // tag gas needs as not calculated in fTTS mode by default | |
| 2635 deco_info &= ~GAS_NEEDS_fTTS; | |
| 623 | 2636 |
| 628 | 2637 // shall calculate gas needs? |
| 2638 if( main_status & CALC_VOLUME ) | |
| 2639 { | |
| 2640 // set the usage rate (SAC rate), starting with working part of the dive | |
| 2641 gas_needs_usage_rate = char_I_SAC_work; | |
| 2642 | |
| 2643 // clear the gas volume needs for gases 1-5 | |
| 2644 for( i = 0; i < NUM_GAS; ++i ) gas_volume_need[i] = 0.0; | |
| 2645 | |
| 2646 #ifdef _rx_functions | |
| 2647 // only for OSTC TR model with TR functions enabled | |
| 2648 if( main_status & TR_FUNCTIONS ) | |
| 2649 { | |
| 2650 // invalidate pressure needs to pressure readings | |
| 2651 int_O_pressure_need[0] = 0 + INT_FLAG_NOT_AVAIL; | |
| 2652 int_O_pressure_need[1] = 0 + INT_FLAG_NOT_AVAIL; | |
| 2653 } | |
| 2654 #endif | |
| 2655 } | |
| 623 | 2656 |
| 631 | 2657 |
| 2658 #ifdef _cave_mode | |
| 2659 if( main_status & CAVE_MODE ) | |
| 2660 { | |
| 2661 // get the position of the first data set to start the backtracking from | |
| 2662 backtrack_index = char_I_backtrack_index; | |
| 2663 | |
| 2664 // get the first backtracking data set | |
| 2665 read_backtrack_data(); | |
| 2666 } | |
| 2667 #endif | |
| 2668 | |
| 2669 | |
| 623 | 2670 #ifdef _profiling |
| 2671 profiling_runs = 0; | |
| 2672 #endif | |
| 2673 | |
| 2674 // The next calculation phase will | |
| 628 | 2675 // - calculate the extended bottom segment if extended bottom time is configured (fTTS), |
| 2676 // - calculate the bottom segment gas need if gas needs calculation is configured, | |
| 623 | 2677 // - proceed with calculating the NDL time else. |
| 628 | 2678 if ( deco_status & DELAYED_ASCENT ) next_planning_phase = PHASE_30_EXTENDED_BOTTOM_TIME; |
| 2679 else if ( main_status & CALC_VOLUME ) next_planning_phase = PHASE_40_BOTTOM_GAS_NEED; | |
| 2680 else next_planning_phase = PHASE_50_NDL_TIME; | |
| 623 | 2681 |
| 2682 break; | |
| 2683 | |
| 2684 | |
| 2685 // | |
| 2686 //---- extended Bottom Time --------------------------------------------------------------- | |
| 2687 // | |
| 628 | 2688 case PHASE_30_EXTENDED_BOTTOM_TIME: |
| 623 | 2689 |
| 631 | 2690 // tag gas needs as calculated in fTTS mode |
| 2691 deco_info |= GAS_NEEDS_fTTS; | |
| 2692 | |
| 623 | 2693 // program interval on simulated tissues (flag bit 7 = 0) |
| 2694 tissue_increment = char_I_extra_time; | |
| 2695 | |
| 628 | 2696 // update the simulated tissues for tissue_increment (char_I_extra_time) minutes at depth, |
| 2697 // calc_alveolar_pressures() has already been called in cyclic initialization | |
| 623 | 2698 calc_tissues(); |
| 2699 | |
| 628 | 2700 // update the CNS value for tissue_increment (char_I_extra_time) minutes at depth |
| 623 | 2701 calc_CNS(); |
| 2702 | |
| 628 | 2703 // the next calculation phase will |
| 2704 // - calculate the extended bottom segment gas needs if gas needs calculation is configured, | |
| 2705 // - proceed with calculating the NDL time else. | |
| 2706 if ( main_status & CALC_VOLUME ) next_planning_phase = PHASE_40_BOTTOM_GAS_NEED; | |
| 2707 else next_planning_phase = PHASE_50_NDL_TIME; | |
| 2708 | |
| 2709 break; | |
| 2710 | |
| 2711 | |
| 2712 // | |
| 2713 //---- Bottom Segment Gas Need ------------------------------------------------------------ | |
| 2714 // | |
| 2715 case PHASE_40_BOTTOM_GAS_NEED: | |
| 2716 | |
| 2717 // on gas 1-5 ? | |
| 2718 if( sim_gas_current_num ) | |
| 2719 { | |
| 631 | 2720 // YES - take either the whole bottom time or just the fTTS/bailout extra time |
| 628 | 2721 gas_needs_time = ( main_status & CALCULATE_BOTTOM ) ? char_I_bottom_time : char_I_extra_time; |
| 2722 | |
| 631 | 2723 // any time to do? |
| 2724 if( gas_needs_time ) | |
| 2725 { | |
| 2726 // YES - set the bottom depth | |
| 2727 gas_needs_depth = char_depth_start; | |
| 2728 | |
| 2729 // calculate required gas volume | |
| 2730 calc_required_volume(); | |
| 2731 | |
| 2732 // take the result | |
| 2733 gas_volume_need[sim_gas_current_num-1] = gas_needs_volume_due; | |
| 2734 } | |
| 628 | 2735 } |
| 2736 | |
| 2737 | |
| 623 | 2738 // the next calculation phase will calculate the NDL time |
| 628 | 2739 next_planning_phase = PHASE_50_NDL_TIME; |
| 604 | 2740 |
| 582 | 2741 break; |
| 2742 | |
| 623 | 2743 |
| 2744 // | |
| 2745 //---- NDL Time --------------------------------------------------------------------------- | |
| 2746 // | |
| 628 | 2747 case PHASE_50_NDL_TIME: |
| 623 | 2748 |
| 2749 // Calculate the remaining no decompression limit (NDL) time for the tissue NDL_tissue. | |
| 2750 // NDL_time will be updated if the NDL time found is shorter than the current NDL_time. | |
| 2751 // | |
| 2752 // In the initialization phase of the calculation cycle: | |
| 2753 // - NDL_time had been initialized to 240 (minutes), | |
| 2754 // - NDL_tissue had been initialized to the tissue with | |
| 2755 // the shortest NDL time in the last cycle. | |
| 2756 // | |
| 2757 calc_NDL_time_tissue(); | |
| 2758 | |
| 2759 // advance to next tissue, wrapping around after last tissue | |
| 2760 NDL_tissue = (NDL_tissue + 1) & (NUM_COMP - 1); | |
| 2761 | |
| 2762 // did we run out of NDL time or did we have probed all tissues? | |
| 2763 if( (NDL_time == 0) || (NDL_tissue == NDL_tissue_start) ) | |
| 2764 { | |
| 2765 // YES | |
| 2766 | |
| 2767 // set the tissue with the shortest NDL time found as | |
| 2768 // the one to start with in the next calculation cycle | |
| 2769 if( deco_status & CALC_NORM ) NDL_tissue_start_norm = NDL_tissue_lead; | |
| 2770 else NDL_tissue_start_alt = NDL_tissue_lead; | |
| 2771 | |
| 631 | 2772 // done with calculating NDL time, next phase will calculate the ascent / cave return |
| 2773 next_planning_phase = PHASE_70_ASCENT_OR_RETURN; | |
| 623 | 2774 } |
| 2775 | |
| 2776 break; | |
| 2777 | |
| 2778 | |
| 560 | 2779 // |
| 631 | 2780 //---- Ascent or Return (cave mode) ------------------------------------------------------- |
| 560 | 2781 // |
| 631 | 2782 case PHASE_70_ASCENT_OR_RETURN: |
| 2783 | |
| 560 | 2784 { |
| 631 | 2785 overlay unsigned char doing_deco_stop = 0; |
| 2786 overlay unsigned char doing_gas_change = 0; | |
| 2787 | |
| 2788 | |
| 2789 // target simulated tissues, default is 1 minute interval | |
| 2790 tissue_increment = 1; | |
| 2791 | |
| 2792 // check if a deco stop is required: | |
| 2793 // - stays at the current depth if a stop is required, | |
| 2794 // - ascents to the next stop if possible, else | |
| 2795 // - ascents by 1 meter | |
| 2796 if( find_next_stop() ) | |
| 2797 { | |
| 2798 //---- stop required -------------------- | |
| 2799 | |
| 2800 // memorize doing a deco stop | |
| 2801 doing_deco_stop = 1; | |
| 2802 | |
| 2803 // set flag for deco stops found | |
| 2804 if( deco_status & CALC_NORM ) deco_info |= DECO_STOPS_NORM; | |
| 2805 else deco_info |= DECO_STOPS_ALT; | |
| 2806 | |
| 2807 // encountered a deco stop, so switch to deco usage rate (SAC deco) | |
| 2808 gas_needs_usage_rate = char_I_SAC_deco; | |
| 2809 | |
| 2810 // check if there is a better gas to switch to | |
| 2811 if( gas_find_best() ) | |
| 2812 { | |
| 2813 // YES - memorize doing a gas change | |
| 2814 doing_gas_change = 1; | |
| 2815 | |
| 2816 // take the gas | |
| 2817 gas_take_best(); | |
| 2818 | |
| 2819 // set the new calculation ratios for N2, He and O2 | |
| 2820 gas_set_ratios(); | |
| 2821 | |
| 2822 // add the gas change time to the stop time | |
| 2823 tissue_increment += char_I_gas_change_time; | |
| 2824 } | |
| 2825 | |
| 2826 // add the stop to an existing stop or add a new stop | |
| 2827 update_deco_table(tissue_increment); | |
| 2828 } | |
| 2829 else | |
| 623 | 2830 { |
| 631 | 2831 //---- no stop required ----------------- |
| 2832 | |
| 2833 // switch to 1/10 minute interval | |
| 2834 tissue_increment = 0; | |
| 2835 | |
| 2836 // memorize not doing a deco stop | |
| 2837 doing_deco_stop = 0; | |
| 2838 | |
| 2839 // check if there is a better gas to switch to, but only: | |
| 2840 // | |
| 2841 // if extended stops are activated OR if cave mode is enabled OR if in bailout | |
| 2842 // AND if the actual depth (char_depth_start) is deeper or at the change | |
| 2843 // depth of the better gas (change depth has not been passed yet) *) | |
| 2844 // AND if the depth of the last stop is above (shallower) or at the change | |
| 2845 // depth of the better gas (do not switch on final ascent) *) | |
| 2846 // | |
| 2847 // *) skipped when calculating in cave mode | |
| 2848 // | |
| 2849 // Attention: do not use a && formula over all 'if' terms, the | |
| 2850 // conditions need to be evaluated in the given order! | |
| 2851 // | |
| 2852 if( ( main_status & EXTENDED_STOPS ) | |
| 2853 || ( main_status & CAVE_MODE ) | |
| 2854 || ( deco_status & BAILOUT_MODE ) | |
| 2855 ) | |
| 2856 if( gas_find_best() ) | |
| 2857 #ifdef _cave_mode | |
| 2858 if( ( char_depth_start >= sim_gas_best_depth ) || ( main_status & CAVE_MODE ) ) | |
| 2859 if( ( char_I_last_stop_depth <= sim_gas_best_depth ) || ( main_status & CAVE_MODE ) ) | |
| 2860 #else | |
| 2861 if( ( char_depth_start >= sim_gas_best_depth ) ) | |
| 2862 if( ( char_I_last_stop_depth <= sim_gas_best_depth ) ) | |
| 2863 #endif | |
| 623 | 2864 { |
| 631 | 2865 // YES - memorize doing a gas change |
| 2866 doing_gas_change = 1; | |
| 2867 | |
| 2868 // take the gas | |
| 2869 gas_take_best(); | |
| 2870 | |
| 2871 // set the new calculation values for N2, He and O2 | |
| 2872 gas_set_ratios(); | |
| 2873 | |
| 2874 // create a stop lasting the gas change time | |
| 628 | 2875 tissue_increment = char_I_gas_change_time; |
| 2876 | |
| 631 | 2877 // if in deco and run from the deco calculator: |
| 2878 // create a stop for the gas change in the stops table | |
| 2879 if( !NDL_time && (deco_status & DECO_CALCULATOR_MODE) ) | |
| 2880 update_deco_table(tissue_increment); | |
| 2881 } | |
| 2882 | |
| 2883 } // stop / no stop | |
| 2884 | |
| 2885 | |
| 2886 #ifdef _cave_mode | |
| 2887 // cave mode actions | |
| 2888 if( main_status & CAVE_MODE ) | |
| 2889 { | |
| 2890 // doing a deco stop? | |
| 2891 if( doing_deco_stop ) | |
| 2892 { | |
| 2893 // YES - not moving, reset the 1/10 minute steps counter | |
| 2894 backtrack_step_counter = 10; | |
| 623 | 2895 } |
| 631 | 2896 else |
| 2897 { | |
| 2898 // NO - on the move, switch back to SAC work | |
| 2899 gas_needs_usage_rate = char_I_SAC_work; | |
| 2900 | |
| 2901 // - decrement the 1/10 minute steps counter if not already zero | |
| 2902 if( backtrack_step_counter ) backtrack_step_counter--; | |
| 2903 | |
| 2904 // - target backtracking depth reached? | |
| 2905 if( char_depth_sim == backtrack_target_depth ) | |
| 2906 { | |
| 2907 // YES - on target depth | |
| 2908 | |
| 2909 // target depth reached within first 1/10 minute? | |
| 2910 if( backtrack_step_counter == 9 ) | |
| 2911 { | |
| 2912 // YES - will not change depth any more while remaining 9/10 of | |
| 2913 // the minute, so can do the full full minute in one step | |
| 2914 tissue_increment = 1; | |
| 2915 backtrack_step_counter = 0; | |
| 2916 } | |
| 2917 | |
| 2918 // on the move for a minute or more now? | |
| 2919 // (incl. doing full minute in one step) | |
| 2920 if( backtrack_step_counter == 0 ) | |
| 2921 { | |
| 2922 // YES - get the data of the next backtracking data set | |
| 2923 read_backtrack_data(); | |
| 2924 } | |
| 2925 } | |
| 2926 } | |
| 2927 } // cave mode | |
| 2928 #endif | |
| 628 | 2929 |
| 2930 // shall calculate gas needs? | |
| 2931 if( main_status & CALC_VOLUME ) | |
| 2932 { | |
| 631 | 2933 overlay unsigned char index_last_gas = sim_gas_last_num-1; |
| 2934 overlay unsigned char index_curr_gas = sim_gas_current_num-1; | |
| 2935 | |
| 2936 #ifdef _cave_mode | |
| 2937 // in cave mode? | |
| 2938 if( main_status & CAVE_MODE ) | |
| 2939 { | |
| 2940 // YES - set the depth for the gas needs calculation to the | |
| 2941 // simulated stop / on-the-move depth | |
| 2942 gas_needs_depth = char_depth_sim; | |
| 2943 } | |
| 2944 else | |
| 2945 #endif | |
| 2946 { | |
| 2947 // NO - set the depth for the gas needs calculation to the shallower | |
| 2948 // one of the actual depth (char_depth_start, current real depth) | |
| 2949 // and the simulated (stop) depth, as we may on purpose dive | |
| 2950 // shallower than we should to conserve on a low running gas supply | |
| 2951 gas_needs_depth = ( char_depth_start < char_depth_sim ) ? | |
| 2952 char_depth_start : char_depth_sim; | |
| 2953 } | |
| 2954 | |
| 2955 // doing a gas change and a gas change time is set? | |
| 2956 if( doing_gas_change && char_I_gas_change_time ) | |
| 628 | 2957 { |
| 2958 // YES - set time it takes for switching the gas | |
| 2959 gas_needs_time = char_I_gas_change_time; | |
| 2960 | |
| 631 | 2961 // - calculate required gas volume for the gas change |
| 2962 calc_required_volume(); | |
| 2963 | |
| 2964 // - add gas change demand to overall demand on the last gas | |
| 2965 if( sim_gas_last_num ) gas_volume_need[index_last_gas] += gas_needs_volume_due; | |
| 2966 | |
| 2967 // - add gas change demand to overall demand on the current gas | |
| 2968 if( sim_gas_current_num ) gas_volume_need[index_curr_gas] += gas_needs_volume_due; | |
| 628 | 2969 } |
| 2970 | |
| 631 | 2971 // current gas is 1-5 ? (i.e. not 0 aka gas 6) |
| 628 | 2972 if( sim_gas_current_num ) |
| 2973 { | |
| 631 | 2974 // set time: doing a deco stop -> 1 minute, encoded by tissue_increment = 1 |
| 2975 // no deco stop -> 1/10 minute, encoded by tissue_increment = 0 | |
| 628 | 2976 gas_needs_time = tissue_increment; |
| 2977 | |
| 631 | 2978 // calculate required gas volume for the stop, ascent or travel |
| 2979 calc_required_volume(); | |
| 628 | 2980 |
| 2981 // add the demand to the overall demand on the current gas | |
| 631 | 2982 gas_volume_need[index_curr_gas] += gas_needs_volume_due; |
| 628 | 2983 } |
| 631 | 2984 |
| 2985 #ifdef _gas_contingency | |
| 2986 // in gas contingency mode? | |
| 2987 if( main_status & GAS_CONTINGENCY ) | |
| 628 | 2988 { |
| 631 | 2989 overlay unsigned char all_peer_tanks_used_up = 1; |
| 2990 | |
| 2991 | |
| 2992 // when doing a gas change and the there is an overdraw on the last gas, | |
| 2993 // then transfer the overdraw to the current gas if the current gas has | |
| 2994 // an equal or deeper change depth than the overdrawn gas | |
| 2995 if( doing_gas_change ) | |
| 2996 if( gas_volume_need[index_last_gas] >= gas_volume_avail[index_last_gas] ) | |
| 2997 if( char_I_deco_gas_change[index_last_gas] <= char_I_deco_gas_change[index_curr_gas] ) | |
| 2998 { | |
| 2999 overlay float overdraw; | |
| 3000 | |
| 3001 // calculate overdraw | |
| 3002 overdraw = gas_volume_need[index_last_gas] - gas_volume_avail[index_last_gas]; | |
| 3003 | |
| 3004 // transfer overdraw | |
| 3005 gas_volume_need[index_last_gas] -= overdraw; | |
| 3006 gas_volume_need[index_curr_gas] += overdraw; | |
| 3007 | |
| 3008 // tag last gas as fully used up | |
| 3009 deco_gas_type[index_last_gas] |= GAS_FULLY_USED_UP; | |
| 3010 } | |
| 3011 | |
| 3012 // if there are peer tanks with the current gas (i.e. other tanks that have the same | |
| 3013 // change depth), check if there is at least one tank that is not yet fully used up | |
| 3014 if( peer_tank[index_curr_gas] ) | |
| 628 | 3015 { |
| 631 | 3016 // scan all tanks |
| 3017 for( i = 0; i < NUM_GAS; i++ ) | |
| 3018 { | |
| 3019 // check if | |
| 3020 // - tank is a peer tank | |
| 3021 // - tank is currently neither staged nor lost | |
| 3022 // - tank is not fully used up yet | |
| 3023 if( (peer_tank[index_curr_gas] & (1 << i) ) ) | |
| 3024 if( !(deco_gas_type[i] & GAS_AVAIL_MASK ) ) | |
| 3025 if( !(deco_gas_type[i] & GAS_FULLY_USED_UP) ) | |
| 3026 { | |
| 3027 // found a peer tank that is available and not fully used up yet | |
| 3028 all_peer_tanks_used_up = 0; | |
| 3029 } | |
| 3030 } | |
| 3031 } | |
| 3032 | |
| 3033 // select which threshold is sensible to check for | |
| 3034 if ( deco_gas_type[index_curr_gas] & GAS_FULLY_USED_UP ) | |
| 3035 { | |
| 3036 // already found as fully used up, nothing to do any more | |
| 628 | 3037 } |
| 631 | 3038 else if( deco_gas_type[index_curr_gas] & GAS_NEARLY_USED_UP ) |
| 3039 { | |
| 3040 // check for fully used up threshold | |
| 3041 if( gas_volume_need[index_curr_gas] >= gas_volume_avail[index_curr_gas] ) | |
| 3042 { | |
| 3043 // tag the gas as fully used up | |
| 3044 deco_gas_type[index_curr_gas] |= GAS_FULLY_USED_UP; | |
| 3045 | |
| 3046 // set warning if all peer tanks are fully used up, too | |
| 3047 if( all_peer_tanks_used_up ) deco_gas_type[index_curr_gas] |= GAS_NEED_WARNING; | |
| 3048 } | |
| 3049 } | |
| 3050 else | |
| 3051 { | |
| 3052 // check for nearly used up threshold | |
| 3053 if( gas_volume_need[index_curr_gas] >= gas_volume_atten[index_curr_gas] ) | |
| 3054 { | |
| 3055 // tag the gas as nearly used up | |
| 3056 deco_gas_type[index_curr_gas] |= GAS_NEARLY_USED_UP; | |
| 3057 | |
| 3058 // set attention if all peer tanks are already fully used up | |
| 3059 if( all_peer_tanks_used_up ) deco_gas_type[index_curr_gas] |= GAS_NEED_ATTENTION; | |
| 3060 } | |
| 3061 } | |
| 3062 } | |
| 3063 #endif // _gas_contingency | |
| 3064 | |
| 3065 } // gas needs | |
| 3066 | |
| 3067 // update the total stops time | |
| 3068 if( doing_deco_stop ) | |
| 628 | 3069 { |
| 631 | 3070 // total stops time is counted in full minutes, add 1 minute |
| 3071 TST_time += 1; | |
| 3072 } | |
| 3073 | |
| 3074 // update the total ascent / cave return time | |
| 3075 if( tissue_increment ) | |
| 3076 { | |
| 3077 // total time to surface is counted in 1/10 minutes, add 1 minute | |
| 3078 TTS_time += 10 * tissue_increment; | |
| 3079 } | |
| 3080 else | |
| 3081 { | |
| 3082 // total time to surface is counted in 1/10 minutes, add 1/10 minute | |
| 3083 TTS_time += 1; | |
| 3084 } | |
| 3085 | |
| 3086 } // overlay | |
| 3087 | |
| 3088 // calculate absolute pressure at the current depth | |
| 3089 sim_pres_respiration = (float)char_depth_sim * METER_TO_BAR + pres_surface; | |
| 582 | 3090 |
| 604 | 3091 // compute current ppO2, ppN2 and ppHe |
| 582 | 3092 calc_alveolar_pressures(); |
| 3093 | |
| 560 | 3094 // update the tissues |
| 582 | 3095 calc_tissues(); |
| 604 | 3096 |
| 631 | 3097 // update the CNS |
| 604 | 3098 calc_CNS(); |
| 623 | 3099 |
| 631 | 3100 // finish stops calculation if the surface is reached or |
| 3101 // if the deco table is full / calculations took too long | |
| 3102 if( (char_depth_sim == 0) || (deco_warnings & DECO_WARNING_INCOMPLETE) ) | |
| 3103 next_planning_phase = PHASE_80_RESULTS; | |
| 623 | 3104 |
| 3105 break; | |
| 3106 | |
| 3107 | |
| 3108 /// | |
| 3109 //--- Results - Initialization ------------------------------------------------------------ | |
| 3110 // | |
| 628 | 3111 case PHASE_80_RESULTS: |
| 3112 | |
| 3113 // convert the CNS value to integer | |
| 3114 convert_sim_CNS_for_display(); | |
| 3115 | |
| 631 | 3116 // normal or alternative plan? |
| 628 | 3117 if( deco_status & CALC_NORM ) |
| 3118 { | |
| 631 | 3119 // normal plan - export the integer CNS value |
| 628 | 3120 int_O_CNS_norm = int_sim_CNS_fraction; |
| 3121 } | |
| 3122 else | |
| 3123 { | |
| 631 | 3124 // alternative plan - export the integer CNS value |
| 628 | 3125 int_O_CNS_alt = int_sim_CNS_fraction; |
| 3126 } | |
| 623 | 3127 |
| 631 | 3128 // limit total time to surface to display max. and rescale to full minutes |
| 3129 if( TTS_time < 9995 ) TTS_time = (TTS_time + 5) / 10; | |
| 3130 else TTS_time = 999 | INT_FLAG_INVALID; | |
| 3131 | |
| 623 | 3132 // The next calculation phase will |
| 3133 // - publish the stops table if in normal plan mode, | |
| 3134 // - proceed with remaining results dependent on if within NDL, or | |
| 3135 // - in deco | |
| 628 | 3136 if ( deco_status & CALC_NORM ) next_planning_phase = PHASE_81_RESULTS_STOPS_TABLE; |
| 3137 else if ( NDL_time ) next_planning_phase = PHASE_82_RESULTS_NDL; | |
| 3138 else next_planning_phase = PHASE_83_RESULTS_DECO; | |
| 623 | 3139 |
| 3140 break; | |
| 3141 | |
| 3142 | |
| 3143 /// | |
| 3144 //--- Publish Stops Table ----------------------------------------------------------------- | |
| 3145 // | |
| 628 | 3146 case PHASE_81_RESULTS_STOPS_TABLE: |
| 623 | 3147 |
| 3148 // publish the stops table to the display functions | |
| 3149 publish_deco_table(); | |
| 3150 | |
| 3151 // When entering deco and the ceiling depth becomes > 0 but the | |
| 3152 // deco calculation reveals no distinct deco stop yet because | |
| 3153 // the deco obligation will vanish during the ascent, create an | |
| 3154 // artificial stop to signal that expedite surfacing ("popping | |
| 3155 // up") is not allowed anymore. | |
| 631 | 3156 if( char_O_deco_depth[0] == 0 ) // simulated ascent reveals no required stops |
| 3157 if( int_O_ceiling > 0 ) // real tissues have a ceiling | |
| 623 | 3158 { |
| 3159 // set a pro forma stop at the configured last stop depth | |
| 631 | 3160 char_O_deco_depth[0] = char_I_last_stop_depth; |
| 623 | 3161 |
| 3162 // set a stop time of 0 minutes, this will be displayed as "..'" | |
| 3163 char_O_deco_time[0] = 0; | |
| 3164 } | |
| 3165 | |
| 3166 // The next calculation phase will publish the main results dependent on being | |
| 3167 // - within NDL, | |
| 3168 // - in deco. | |
| 628 | 3169 if ( NDL_time ) next_planning_phase = PHASE_82_RESULTS_NDL; |
| 3170 else next_planning_phase = PHASE_83_RESULTS_DECO; | |
| 623 | 3171 |
| 3172 break; | |
| 3173 | |
| 3174 | |
| 3175 /// | |
| 3176 //--- Results - within NDL ---------------------------------------------------------------- | |
| 3177 // | |
| 628 | 3178 case PHASE_82_RESULTS_NDL: |
| 623 | 3179 |
| 631 | 3180 // normal or alternative plan? |
| 623 | 3181 if( deco_status & CALC_NORM ) |
| 3182 { | |
| 631 | 3183 // normal plan - output the NDL and TTS time |
| 3184 int_O_NDL_norm = NDL_time; | |
| 3185 int_O_TTS_norm = TTS_time; | |
| 3186 | |
| 3187 // clear the stops time | |
| 3188 int_O_TST_norm = 0; | |
| 623 | 3189 } |
| 3190 else | |
| 3191 { | |
| 631 | 3192 // alternative plan - output the NDL time |
| 3193 int_O_NDL_alt = NDL_time; | |
| 3194 int_O_TTS_alt = TTS_time; | |
| 3195 | |
| 3196 // clear the alternative TTS and stops time | |
| 3197 int_O_TST_alt = 0 + INT_FLAG_ZERO; | |
| 623 | 3198 } |
| 3199 | |
| 3200 // The next calculation phase will | |
| 631 | 3201 // - convert the gas needs from volume to pressure if gas needs calculation is configured |
| 3202 // - else finish the calculation cycle | |
| 3203 if ( main_status & CALC_VOLUME ) next_planning_phase = PHASE_84_GAS_NEEDS_PRESSURES; | |
| 3204 else next_planning_phase = PHASE_90_FINISH; | |
| 623 | 3205 |
| 3206 break; | |
| 3207 | |
| 3208 | |
| 3209 /// | |
| 3210 //--- Results - in Deco ------------------------------------------------------------------- | |
| 3211 // | |
| 628 | 3212 case PHASE_83_RESULTS_DECO: |
| 3213 | |
| 631 | 3214 // limit total stops time to display max. |
| 3215 if( TST_time > 999 ) TST_time = 999 | INT_FLAG_INVALID; | |
| 3216 | |
| 3217 | |
| 3218 // normal or alternative plan? | |
| 623 | 3219 if( deco_status & CALC_NORM ) |
| 3220 { | |
| 631 | 3221 // normal plan - clear the normal NDL time |
| 3222 int_O_NDL_norm = 0; | |
| 3223 | |
| 3224 // export the TTS and total stops time | |
| 3225 int_O_TTS_norm = TTS_time; | |
| 3226 int_O_TST_norm = TST_time; | |
| 623 | 3227 } |
| 3228 else | |
| 3229 { | |
| 631 | 3230 // alternative plan - clear the alternative NDL time |
| 3231 int_O_NDL_alt = 0; | |
| 3232 | |
| 3233 // export the TTS and total stops time | |
| 3234 int_O_TTS_alt = TTS_time; | |
| 3235 int_O_TST_alt = TST_time; | |
| 623 | 3236 } |
| 3237 | |
| 3238 // The next calculation phase will | |
| 631 | 3239 // - convert the gas needs from volume to pressure if gas needs calculation is configured |
| 3240 // - else finish the calculation cycle | |
| 3241 if ( main_status & CALC_VOLUME ) next_planning_phase = PHASE_84_GAS_NEEDS_PRESSURES; | |
| 3242 else next_planning_phase = PHASE_90_FINISH; | |
| 623 | 3243 |
| 3244 break; | |
| 3245 | |
| 3246 | |
| 3247 // | |
| 628 | 3248 //--- Results - convert Gas Needs Volumes to Pressures ------------------------------------ |
| 623 | 3249 // |
| 628 | 3250 case PHASE_84_GAS_NEEDS_PRESSURES: |
| 623 | 3251 |
| 3252 // convert required volume of the gas pointed to by gas_needs_gas_index | |
| 3253 // into the respective pressure and set the flags | |
| 631 | 3254 convert_volume_to_pressure(); |
| 623 | 3255 |
| 3256 // increment index to address next gas | |
| 3257 gas_needs_gas_index++; | |
| 3258 | |
| 3259 // if all gases have been converted, advance to next calculation phase | |
| 631 | 3260 #ifdef _cave_mode |
| 3261 if( gas_needs_gas_index == NUM_GAS ) next_planning_phase = PHASE_85_GAS_NEEDS_CAVE; | |
| 3262 #else | |
| 623 | 3263 if( gas_needs_gas_index == NUM_GAS ) next_planning_phase = PHASE_90_FINISH; |
| 631 | 3264 #endif |
| 623 | 3265 |
| 3266 break; | |
| 3267 | |
| 3268 | |
| 631 | 3269 #ifdef _cave_mode |
| 3270 // | |
| 3271 //--- Results - tag Gas Needs as Cave or Open Water Mode ---------------------------------- | |
| 3272 // | |
| 3273 case PHASE_85_GAS_NEEDS_CAVE: | |
| 3274 | |
| 3275 // in cave mode? | |
| 3276 if( main_status & CAVE_MODE ) | |
| 3277 { | |
| 3278 // YES - tag gas needs as calculated in cave mode (return along recorded depth profile) | |
| 3279 deco_info |= GAS_NEEDS_CAVE; | |
| 3280 } | |
| 3281 else | |
| 3282 { | |
| 3283 // NO - tag gas needs as calculated in open water mode (vertical ascent) | |
| 3284 deco_info &= ~GAS_NEEDS_CAVE; | |
| 3285 } | |
| 3286 | |
| 3287 // advance to next calculation phase | |
| 3288 next_planning_phase = PHASE_90_FINISH; | |
| 3289 | |
| 3290 break; | |
| 3291 #endif | |
| 3292 | |
| 3293 | |
| 623 | 3294 // |
| 3295 //--- finish Calculation Cycle ------------------------------------------------------------ | |
| 3296 // | |
| 3297 case PHASE_90_FINISH: | |
| 3298 | |
| 3299 // Check if deco obligation is steady state or decreasing. | |
| 631 | 3300 // Update the result only: |
| 3301 // - if an alternative plan is enabled, and | |
| 3302 // - if a valid alternative plan TTS exists, and | |
| 3303 // - if it is not a bailout plan | |
| 3304 if( (deco_status & CALC_ALT ) ) | |
|
635
9a64914a8fca
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|
3305 if( !(int_O_TTS_alt & INT_FLAG_INVALID) ) |
| 631 | 3306 if( !(deco_status & BAILOUT_MODE ) ) |
| 623 | 3307 { |
| 628 | 3308 if( int_O_TTS_alt < int_O_TTS_norm ) deco_info |= DECO_ZONE; |
| 3309 if( int_O_TTS_alt > int_O_TTS_norm ) deco_info &= ~DECO_ZONE; | |
| 623 | 3310 } |
| 3311 | |
| 3312 // export updated deco infos and warnings | |
| 3313 char_O_deco_info = deco_info; | |
| 3314 char_O_deco_warnings = deco_warnings; | |
| 3315 | |
| 3316 // restore command flag to indicate that deco calculation cycle has finished | |
| 3317 char_O_deco_status = deco_status; | |
| 3318 | |
| 3319 // signal end of deco calculation | |
| 3320 next_planning_phase = PHASE_00_DONE; | |
| 3321 | |
| 3322 break; | |
| 3323 | |
| 3324 } // switch | |
| 3325 | |
| 3326 // read timer 5, result will be stored in tmr5_value (in 1/32 ms) and tmr5_overflow | |
| 3327 read_tmr5(); | |
| 3328 | |
| 3329 } // sequence calculation phases while not timed out and calculation cycle is not finished | |
| 3330 while( (tmr5_overflow == 0) && ( next_planning_phase != PHASE_00_DONE ) ); | |
| 3331 | |
| 3332 // report where we are in terms of depth reached, used in deco calculator to show deco calculation progress | |
| 3333 char_O_depth_sim = char_depth_sim; | |
| 3334 | |
| 3335 | |
| 3336 #ifdef _profiling | |
| 3337 | |
| 3338 //---- Performance Measurement ------------------------------------------- | |
| 3339 | |
| 3340 // convert timer 5 readout into ms | |
| 3341 profiling_runtime = tmr5_value / 32; | |
| 3342 | |
| 3343 // actual runtime longer than target runtime? | |
| 3344 if( tmr5_overflow ) | |
| 3345 { | |
| 3346 // YES - report excess | |
| 3347 int_O_profiling_overrun = profiling_runtime; | |
| 3348 | |
| 3349 // - excess > max we had so far? | |
| 3350 if( int_O_profiling_overrun > int_O_profiling_overrun_max ) | |
| 3351 { | |
| 3352 // YES - update max | |
| 3353 int_O_profiling_overrun_max = int_O_profiling_overrun; | |
| 3354 | |
| 3355 // - store the causing phase | |
| 3356 char_O_profiling_overrun_phase = profiling_phase; | |
| 3357 } | |
| 560 | 3358 } |
| 623 | 3359 else |
| 3360 { | |
| 3361 // NO - calculate unused budget and flag it to be under-run time | |
| 3362 int_O_profiling_overrun = (2048 - profiling_runtime) | 0x8000; | |
| 3363 } | |
| 3364 | |
| 3365 // increment number of runs in current cycle | |
| 3366 profiling_runs += 1; | |
| 3367 | |
| 3368 // planning cycle completed? | |
| 3369 if( next_planning_phase == PHASE_00_DONE ) | |
| 3370 { | |
| 3371 // YES - export number of runs it took | |
| 3372 if( deco_status & COMPLETED_NORM ) char_O_profiling_runs_norm = profiling_runs; | |
| 3373 else char_O_profiling_runs_alt = profiling_runs; | |
| 3374 } | |
| 3375 | |
| 3376 #endif | |
| 3377 | |
| 3378 } | |
| 3379 | |
| 3380 | |
| 3381 ////////////////////////////////////////////////////////////////////////////// | |
| 3382 // calc_hauptroutine_data_input | |
| 3383 // | |
| 3384 // Set all C-code dive parameters from their ASM-code values. | |
| 3385 // | |
| 3386 void calc_hauptroutine_data_input(void) | |
| 3387 { | |
| 3388 overlay float IG_ratio; | |
| 3389 | |
| 3390 // safeguard and convert the surface pressure (mbar -> bar) (*) | |
| 3391 if( int_I_pres_surface < 500 ) pres_surface = 0.500; | |
| 3392 else pres_surface = 0.001 * int_I_pres_surface; | |
| 3393 | |
| 3394 // safeguard and convert the current real pressure | |
| 3395 if( int_I_pres_respiration < 500 ) real_pres_respiration = 0.500; | |
| 3396 else real_pres_respiration = 0.001 * int_I_pres_respiration; | |
| 3397 | |
| 3398 // safeguard further parameters to protect the tissue-flag and the stop table | |
| 3399 if( char_I_sim_advance_time > 127 ) char_I_sim_advance_time = 127; | |
| 3400 if( char_I_extra_time > 127 ) char_I_extra_time = 127; | |
| 3401 if( char_I_gas_change_time > 99 ) char_I_gas_change_time = 99; | |
| 3402 | |
| 628 | 3403 |
| 3404 // compute the depth in meters where we are now | |
| 3405 float_depth_real = (real_pres_respiration - pres_surface) * BAR_TO_METER; | |
| 3406 | |
| 3407 // convert to integer and round up to next full meter | |
| 3408 char_depth_real = (unsigned char)(float_depth_real + 0.99); | |
| 3409 | |
| 3410 | |
| 623 | 3411 // calculate partial pressure of N2 in respired air at surface pressure |
| 3412 calc_N2_equilibrium(); | |
| 3413 | |
| 3414 // get, safeguard and convert the saturation and desaturation factors | |
| 3415 get_saturation_factors(); | |
| 3416 | |
| 3417 #ifdef _ccr_pscr | |
| 3418 // compute a factor that will be used later on for pSCR ppO2 drop calculation (*) | |
| 3419 float_pSCR_factor = 0.01 * char_I_PSCR_drop * char_I_PSCR_lungratio; | |
| 3420 #endif | |
| 3421 | |
| 3422 #ifdef _helium | |
| 3423 // get the currently breathed gas ratios | |
| 3424 real_O2_ratio = 0.01 * char_I_O2_ratio; | |
| 3425 real_He_ratio = 0.01 * char_I_He_ratio; | |
| 3426 | |
| 3427 // calculate the inert gas ratio (local helper variable) | |
| 3428 IG_ratio = 1.00 - real_O2_ratio; | |
| 3429 | |
| 3430 // calculate the N2 ratio | |
| 3431 real_N2_ratio = IG_ratio - real_He_ratio; | |
| 3432 #else | |
| 3433 // get the currently breathed O2 ratio | |
| 3434 real_O2_ratio = 0.01 * char_I_O2_ratio; | |
| 3435 | |
| 3436 // set the He ratio to zero | |
| 3437 real_He_ratio = 0.0; | |
| 3438 | |
| 3439 // calculate the N2 / inert gas ratio | |
| 3440 real_N2_ratio = IG_ratio = 1.00 - real_O2_ratio; | |
| 3441 #endif // _helium | |
| 3442 | |
| 3443 #ifdef _ccr_pscr | |
| 3444 // calculate ppO2 drop in pSCR loop for real tissues | |
| 3445 real_pSCR_drop = IG_ratio * float_pSCR_factor; | |
| 3446 #endif | |
| 3447 | |
| 0 | 3448 } |
| 3449 | |
| 3450 | |
| 3451 ////////////////////////////////////////////////////////////////////////////// | |
| 582 | 3452 // calc_tissues |
| 0 | 3453 // |
| 623 | 3454 // INPUT: ppN2 partial pressure of inspired N2 |
| 3455 // ppHe partial pressure of inspired He | |
| 631 | 3456 // tissue_increment tissue selector (real or simulated) and interval time |
| 623 | 3457 // |
| 3458 // MODIFIED: real_pres_tissue_N2[] tissue N2 pressures (in real tissues context) | |
| 3459 // real_pres_tissue_He[] tissue He pressures (in real tissues context) | |
| 3460 // sim_pres_tissue_N2[] tissue N2 pressures (in simulated tissues context) | |
| 3461 // sim_pres_tissue_He[] tissue He pressures (in simulated tissues context) | |
| 3462 // | |
| 3463 // OUTPUT: char_O_tissue_pres_N2[] tissue N2 pressures scaled for display purpose (in real tissues context) | |
| 3464 // char_O_tissue_pres_He[] tissue He pressures scaled for display purpose (in real tissues context) | |
| 3465 // char_O_tissue_pressure[] combined tissue pressures scaled for display purpose (in real tissue context) | |
| 582 | 3466 // |
| 3467 static void calc_tissues() | |
| 0 | 3468 { |
| 623 | 3469 overlay unsigned char period; |
| 560 | 3470 overlay float temp_tissue_N2; |
| 623 | 3471 |
| 3472 #ifdef _helium | |
| 560 | 3473 overlay float temp_tissue_He; |
| 623 | 3474 #endif |
| 582 | 3475 |
| 3476 | |
| 3477 assert( 0.00 <= ppN2 && ppN2 < 11.2 ); // 80% N2 at 130m | |
| 3478 assert( 0.00 <= ppHe && ppHe < 12.6 ); // 90% He at 130m | |
| 3479 | |
| 3480 | |
| 604 | 3481 for( ci=0; ci < NUM_COMP; ci++ ) // iterate through all compartments |
| 582 | 3482 { |
| 631 | 3483 i = tissue_increment & TIME_MASK; // i > 0: do a number of i full minutes |
| 3484 // I = 0: do 2 (real tissues) or 6 (simulated tissues) seconds | |
| 3485 | |
| 3486 if( i == 0 ) // check if we shall do one 2 or 6 seconds interval | |
| 560 | 3487 { |
| 631 | 3488 read_Buhlmann_times(0); // YES - program coefficients for a 2 or 6 seconds period |
| 623 | 3489 period = 1; // - set period length (in cycles) |
| 3490 i = 1; // - and one cycle to do | |
| 560 | 3491 } |
| 582 | 3492 else if( i > 9 ) // check if we can start with 10 minutes periods |
| 560 | 3493 { |
| 623 | 3494 read_Buhlmann_times(2); // YES - program coefficients for 10 minutes periods |
| 3495 period = 10; // set period length (in cycles) to ten | |
| 560 | 3496 } |
| 623 | 3497 else // last but not lease, do 1 to 9 minutes |
| 560 | 3498 { |
| 623 | 3499 read_Buhlmann_times(1); // NO - program coefficients for 1 minute periods |
| 3500 period = 1; // - set period length (in cycles) to one | |
| 560 | 3501 } |
| 3502 | |
| 3503 do | |
| 3504 { | |
| 623 | 3505 //---- N2 -------------------------------------------------------- |
| 3506 | |
| 3507 temp_tissue = (tissue_increment & TISSUE_SELECTOR) ? real_pres_tissue_N2[ci] : sim_pres_tissue_N2[ci]; | |
| 560 | 3508 |
| 3509 temp_tissue = (ppN2 - temp_tissue) * var_N2_e; | |
| 3510 | |
| 623 | 3511 apply_saturation_factors(); |
| 3512 | |
| 3513 if( tissue_increment & TISSUE_SELECTOR ) | |
| 560 | 3514 { |
| 623 | 3515 temp_tissue_N2 = temp_tissue; |
| 3516 real_pres_tissue_N2[ci] += temp_tissue; | |
| 560 | 3517 } |
| 3518 else | |
| 3519 { | |
| 623 | 3520 sim_pres_tissue_N2[ci] += temp_tissue; |
| 560 | 3521 } |
| 3522 | |
| 623 | 3523 #ifdef _helium |
| 3524 //---- He -------------------------------------------------------- | |
| 3525 | |
| 3526 temp_tissue = (tissue_increment & TISSUE_SELECTOR) ? real_pres_tissue_He[ci] : sim_pres_tissue_He[ci]; | |
| 560 | 3527 |
| 3528 temp_tissue = (ppHe - temp_tissue) * var_He_e; | |
| 3529 | |
| 623 | 3530 apply_saturation_factors(); |
| 3531 | |
| 3532 if( tissue_increment & TISSUE_SELECTOR ) | |
| 560 | 3533 { |
| 623 | 3534 temp_tissue_He = temp_tissue; |
| 3535 real_pres_tissue_He[ci] += temp_tissue; | |
| 560 | 3536 } |
| 3537 else | |
| 3538 { | |
| 623 | 3539 sim_pres_tissue_He[ci] += temp_tissue; |
| 560 | 3540 } |
| 623 | 3541 #endif |
| 3542 | |
| 3543 //---- decrement loop counter and adjust step size --------------- | |
| 560 | 3544 |
| 3545 // decrement loop counter | |
| 3546 i -= period; | |
| 582 | 3547 |
| 560 | 3548 // check if we need to switch from 10 minute periods to 1 minute periods |
| 3549 if( (i > 0) && (period = 10) && (i < 10) ) | |
| 3550 { | |
| 582 | 3551 read_Buhlmann_times(1); // program coefficients for 1 minute periods |
| 560 | 3552 period = 1; // set period length (in cycles) to one |
| 3553 } | |
| 3554 } | |
| 3555 while( i ); | |
| 582 | 3556 |
| 3557 | |
| 560 | 3558 // have the computations been done for the "real" tissues? |
| 623 | 3559 if( tissue_increment & TISSUE_SELECTOR ) |
| 560 | 3560 { |
| 623 | 3561 |
| 3562 #ifdef _helium | |
| 3563 | |
| 560 | 3564 // net tissue balance |
| 3565 temp_tissue = temp_tissue_N2 + temp_tissue_He; | |
| 582 | 3566 |
| 623 | 3567 |
| 560 | 3568 // check tissue on-/off-gassing and IBCD with applying a threshold of +/-HYST |
| 3569 // | |
| 584 | 3570 if ( temp_tissue < -HYST ) // check if the tissue is off-gassing |
| 560 | 3571 { |
| 623 | 3572 // tag tissue as not experiencing mentionable IBCD |
| 3573 IBCD_tissue_vector &= ~(1 << ci); | |
| 560 | 3574 } |
| 3575 else if ( temp_tissue > +HYST ) // check if the tissue in on-gassing | |
| 3576 { | |
| 623 | 3577 // check for counter diffusion |
| 3578 if( ((temp_tissue_N2 > 0.0) && (temp_tissue_He < 0.0)) | |
| 604 | 3579 || ((temp_tissue_N2 < 0.0) && (temp_tissue_He > 0.0)) ) |
| 560 | 3580 { |
| 623 | 3581 // tag tissue as experiencing mentionable IBCD |
| 3582 IBCD_tissue_vector |= (1 << ci); | |
| 560 | 3583 } |
| 3584 } | |
| 3585 | |
| 623 | 3586 #endif |
| 3587 | |
| 3588 // For N2 tissue pressure display purpose: | |
| 3589 | |
| 3590 // basically keep the on-gassing / off-gassing flag from last invocation, but flip | |
| 3591 // it in case the rate exceeds a set hysteresis (actual value: see #define of HYST) | |
| 3592 char_O_tissue_pres_N2[ci] &= 128; | |
| 3593 if ( temp_tissue_N2 > +HYST ) char_O_tissue_pres_N2[ci] = 128; // set flag for tissue pressure is increasing | |
| 3594 else if ( temp_tissue_N2 < -HYST ) char_O_tissue_pres_N2[ci] = 0; // clear flag (-> tissue pressure is decreasing) | |
| 3595 | |
| 3596 // scale N2 tissue pressure such that the surface steady-state tissue loading | |
| 3597 // of [0.7902 * (1013 hPa - ppWater)] bar will give a 8, which aligns with | |
| 3598 // the 2nd scale line. | |
| 3599 temp_tissue_N2 = (8 / (0.7902 * (1.013 - ppWater))) * real_pres_tissue_N2[ci]; | |
| 3600 | |
| 3601 // limit to 127 to protect the uppermost bit which holds the sat/desat flag | |
| 3602 if (temp_tissue_N2 > 127) temp_tissue_N2 = 127; | |
| 3603 | |
| 3604 // convert to integer and combine with sat/desat flag | |
| 3605 char_O_tissue_pres_N2[ci] += (unsigned char)temp_tissue_N2; | |
| 3606 | |
| 3607 #ifdef _helium | |
| 3608 | |
| 3609 // For He tissue pressure display purpose: | |
| 3610 | |
| 3611 // basically keep the on-gassing / off-gassing flag from last invocation, but flip | |
| 3612 // it in case the rate exceeds a set hysteresis (actual value: see #define of HYST) | |
| 3613 char_O_tissue_pres_He[ci] &= 128; | |
| 3614 if ( temp_tissue_He > +HYST ) char_O_tissue_pres_He[ci] = 128; // set flag for tissue pressure is increasing | |
| 3615 else if ( temp_tissue_He < -HYST ) char_O_tissue_pres_He[ci] = 0; // clear flag (-> tissue pressure is decreasing) | |
| 3616 | |
| 3617 // scale He tissue pressure alike it is done for N2. | |
| 3618 // With no He in a tissue, the result will be 0. | |
| 3619 temp_tissue_He = (8 / (0.7902 * (1.013 - ppWater))) * real_pres_tissue_He[ci]; | |
| 3620 | |
| 3621 // limit to 127 to protect the uppermost bit which holds the sat/desat flag | |
| 3622 if (temp_tissue_He > 127) temp_tissue_He = 127; | |
| 3623 | |
| 3624 // convert to integer and combine with sat/desat flag | |
| 3625 char_O_tissue_pres_He[ci] += (unsigned char)temp_tissue_He; | |
| 3626 | |
| 3627 | |
| 3628 // For combined tissue pressure display purpose: | |
| 3629 | |
| 3630 // basically keep the on-gassing / off-gassing flag from last invocation, but flip | |
| 3631 // it in case the rate exceeds a set hysteresis (actual value: see #define of HYST) | |
| 3632 char_O_tissue_pressure[ci] &= 128; | |
| 3633 if ( temp_tissue > +HYST ) char_O_tissue_pressure[ci] = 128; // set flag for tissue pressure is increasing | |
| 3634 else if ( temp_tissue < -HYST ) char_O_tissue_pressure[ci] = 0; // clear flag (-> tissue pressure is decreasing) | |
| 3635 | |
| 3636 // add the two scaled pressures. | |
| 3637 temp_tissue = temp_tissue_N2 + temp_tissue_He; | |
| 3638 | |
| 3639 // limit to 127 to protect the uppermost bit which holds the sat/desat flag | |
| 560 | 3640 if (temp_tissue > 127) temp_tissue = 127; |
| 3641 | |
| 623 | 3642 // convert to integer and combine with sat/desat flag |
| 3643 char_O_tissue_pressure[ci] += (unsigned char)temp_tissue; | |
| 3644 | |
| 3645 #else | |
| 3646 | |
| 3647 // He tissue pressure is zero | |
| 3648 char_O_tissue_pres_He[ci] = 0; | |
| 3649 | |
| 3650 // combined tissue pressure equals N2 tissue pressure | |
| 3651 char_O_tissue_pressure[ci] = char_O_tissue_pres_N2[ci]; | |
| 3652 | |
| 3653 #endif | |
| 3654 | |
| 582 | 3655 } //if |
| 3656 | |
| 3657 } // for | |
| 0 | 3658 } |
| 3659 | |
| 623 | 3660 |
| 0 | 3661 ////////////////////////////////////////////////////////////////////////////// |
| 3662 // calc_limit | |
| 3663 // | |
| 623 | 3664 // Input: GF_parameter gradient factor to be used, negative values activate surface mode |
| 3665 // tissue_increment selector for context: real or simulated tissues | |
| 3666 // sim_pres_tissue_N2/_He tissue pressures (used in simulated tissues context) | |
| 3667 // real_pres_tissue_N2/_He tissue pressures (used in real tissues context) | |
| 3668 // | |
| 3669 // Output: lead_supersat highest supersaturation found among all tissues, 1.0 = 100% | |
| 3670 // lead_tissue number of the leading tissue (0-15) | |
| 3671 // ceiling ceiling in bar relative pressure | |
| 3672 // | |
| 3673 // Modified: deco_warnings for IBCD, micro bubbles and outside warning (only in real tissues context) | |
| 582 | 3674 // |
| 3675 static void calc_limit(PARAMETER float GF_parameter) | |
| 0 | 3676 { |
| 631 | 3677 overlay float pres_ambient_min_overall = 0.0; |
| 3678 overlay unsigned char surface_mode = 0; // 0: off, 1: on | |
| 623 | 3679 |
| 3680 | |
| 3681 // check mode | |
| 3682 if( GF_parameter < 0 ) | |
| 3683 { | |
| 3684 // activate surface mode | |
| 3685 surface_mode = 1; | |
| 3686 | |
| 3687 // normalize parameter | |
| 3688 GF_parameter = -GF_parameter; | |
| 3689 } | |
| 3690 | |
| 3691 // set leading tissue number to tissue 1 (it has the index 0) | |
| 3692 lead_tissue = 0; | |
| 604 | 3693 |
| 3694 // initialize leading tissue supersaturation value to null | |
| 623 | 3695 lead_supersat = 0.0; |
| 3696 | |
| 3697 // next code section is relevant only when invoked on the real tissues | |
| 3698 if( tissue_increment & TISSUE_SELECTOR ) | |
| 582 | 3699 { |
| 623 | 3700 // clear IBCD, micro-bubbles and outside warning flags (locked warnings will be preserved) |
| 3701 deco_warnings &= ~( DECO_WARNING_IBCD + DECO_WARNING_MBUBBLES + DECO_WARNING_OUTSIDE + DECO_ATTENTION_OUTSIDE ); | |
| 582 | 3702 } |
| 3703 | |
| 3704 // loop over all tissues | |
| 604 | 3705 for( ci = 0; ci < NUM_COMP; ci++ ) |
| 582 | 3706 { |
| 631 | 3707 overlay float pres_ambient_min_tissue; |
| 623 | 3708 |
| 3709 | |
| 3710 // get the coefficients for tissue ci | |
| 3711 read_Buhlmann_coefficients(); | |
| 3712 | |
| 3713 #ifdef _helium | |
| 582 | 3714 |
| 3715 // get the tissue pressures | |
| 623 | 3716 // adopt_Buhlmann_coefficients needs calc_pres_tissue_N2/He when compiled for helium |
| 3717 if( tissue_increment & TISSUE_SELECTOR ) | |
| 560 | 3718 { |
| 582 | 3719 // context is real tissues |
| 623 | 3720 calc_pres_tissue_N2 = real_pres_tissue_N2[ci]; |
| 3721 calc_pres_tissue_He = real_pres_tissue_He[ci]; | |
| 560 | 3722 } |
| 3723 else | |
| 3724 { | |
| 582 | 3725 // context is simulated tissues |
| 3726 calc_pres_tissue_N2 = sim_pres_tissue_N2[ci]; | |
| 3727 calc_pres_tissue_He = sim_pres_tissue_He[ci]; | |
| 3728 } | |
| 3729 | |
| 3730 // overall tissue pressure | |
| 3731 pres_tissue = calc_pres_tissue_N2 + calc_pres_tissue_He; | |
| 3732 | |
| 623 | 3733 #else |
| 3734 | |
| 3735 // get the tissue pressure | |
| 3736 pres_tissue = ( tissue_increment & TISSUE_SELECTOR ) ? real_pres_tissue_N2[ci] : sim_pres_tissue_N2[ci]; | |
| 3737 | |
| 3738 #endif | |
| 582 | 3739 |
| 604 | 3740 // adopt a and b coefficients to current N2/He ratio inside the tissue |
| 3741 adopt_Buhlmann_coefficients(); | |
| 582 | 3742 |
| 3743 // next calculations are only relevant when invoked on the real tissues | |
| 623 | 3744 if( tissue_increment & TISSUE_SELECTOR ) |
| 582 | 3745 { |
| 618 | 3746 overlay float pres_tissue_max; |
| 582 | 3747 overlay float supersat; |
| 608 | 3748 overlay float baseline_threshold; |
| 604 | 3749 |
| 623 | 3750 |
| 582 | 3751 // check if tissue is in supersaturation |
| 618 | 3752 if( pres_tissue > real_pres_respiration ) |
| 582 | 3753 { |
| 618 | 3754 // calculate maximum allowed tissue pressure at current ambient pressure |
| 623 | 3755 pres_tissue_max = real_pres_respiration / var_b + var_a; |
| 618 | 3756 |
| 3757 // calculate current supersaturation value (1.0 = 100%) of this tissue according to straight Buhlmann | |
| 3758 supersat = ( pres_tissue - real_pres_respiration ) | |
| 3759 / ( pres_tissue_max - real_pres_respiration ); | |
| 3760 | |
| 623 | 3761 // calculate supersaturation value for display purpose: 1.35 = 135% = 86 pixel |
| 3762 if( supersat <= 1.35 ) char_O_tissue_saturation[ci] = (unsigned char)(supersat * 64); | |
| 3763 else char_O_tissue_saturation[ci] = 86; | |
| 3764 | |
| 582 | 3765 // memorize highest supersaturation found |
| 3766 if( supersat > lead_supersat ) lead_supersat = supersat; | |
| 3767 | |
| 608 | 3768 // tissue-dependent baseline threshold for micro bubbles and outside warnings |
| 3769 baseline_threshold = 0.02 * ci + 1.0; | |
| 3770 | |
| 3771 // micro bubbles warning: supersaturation > baseline threshold | |
| 3772 if( supersat > baseline_threshold ) | |
| 623 | 3773 deco_warnings |= (DECO_WARNING_MBUBBLES + DECO_WARNING_MBUBBLES_lock); |
| 604 | 3774 |
| 608 | 3775 // outside warning: supersaturation > baseline threshold + additional 5% margin |
| 623 | 3776 if( supersat > (baseline_threshold + 0.05) ) |
| 3777 deco_warnings |= (DECO_WARNING_OUTSIDE + DECO_WARNING_OUTSIDE_lock ); | |
| 3778 } | |
| 3779 else | |
| 3780 { | |
| 3781 // supersaturation is defined as zero while tissue pressure <= ambient pressure | |
| 3782 supersat = 0.0; | |
| 3783 char_O_tissue_saturation[ci] = 0; | |
| 560 | 3784 } |
| 623 | 3785 |
| 3786 // next only when in surface mode | |
| 3787 if( surface_mode ) | |
| 3788 { | |
| 3789 // tag tissue whether it is beyond the M-line limit or not | |
| 3790 if( supersat > 1.0 ) | |
| 3791 { | |
| 3792 char_O_tissue_pres_N2[ci] |= 128; | |
| 3793 #ifdef _helium | |
| 3794 char_O_tissue_pres_He[ci] |= 128; | |
| 3795 #endif | |
| 3796 char_O_tissue_pressure[ci] |= 128; | |
| 3797 } | |
| 3798 else | |
| 3799 { | |
| 3800 char_O_tissue_pres_N2[ci] &= ~128; | |
| 3801 #ifdef _helium | |
| 3802 char_O_tissue_pres_He[ci] &= ~128; | |
| 3803 #endif | |
| 3804 char_O_tissue_pressure[ci] &= ~128; | |
| 3805 } | |
| 3806 } | |
| 3807 } // real tissues | |
| 582 | 3808 |
| 618 | 3809 // calculate the minimum ambient pressure that the tissue can withstand |
| 631 | 3810 if( char_I_model == 0 ) |
| 618 | 3811 { |
| 3812 // straight Buhlmann | |
| 631 | 3813 pres_ambient_min_tissue = (pres_tissue - var_a) * var_b; |
| 618 | 3814 } |
| 3815 else | |
| 3816 { | |
| 3817 // Buhlmann with Eric Baker's varying gradient factor correction | |
| 3818 // note: this equation [1] is the inverse of equation [2] | |
| 631 | 3819 pres_ambient_min_tissue = ( pres_tissue - (var_a * GF_parameter) ) |
| 3820 / ( 1.0 - GF_parameter + (GF_parameter / var_b ) ); | |
| 618 | 3821 } |
| 560 | 3822 |
| 3823 // check if this tissue requires a higher ambient pressure than was found to be needed up to now | |
| 631 | 3824 if( pres_ambient_min_tissue > pres_ambient_min_overall ) |
| 582 | 3825 { |
| 631 | 3826 pres_ambient_min_overall = pres_ambient_min_tissue; |
| 3827 lead_tissue = ci; | |
| 582 | 3828 } |
| 3829 } // for | |
| 3830 | |
| 631 | 3831 // compute ceiling in bar relative pressure |
| 3832 ceiling = pres_ambient_min_overall - pres_surface; | |
| 3833 | |
| 3834 // limit ceiling to positive values | |
| 3835 if( ceiling < 0.0 ) ceiling = 0.0; | |
| 623 | 3836 |
| 3837 #ifdef _helium | |
| 3838 // IBCD is checked for real tissues only | |
| 3839 if( tissue_increment & TISSUE_SELECTOR ) | |
| 560 | 3840 { |
| 604 | 3841 // check if the leading tissue is in IBCD condition |
| 623 | 3842 if( (IBCD_tissue_vector & (1 << lead_tissue)) |
| 3843 && ((real_pres_tissue_N2[lead_tissue] + real_pres_tissue_He[lead_tissue]) > real_pres_respiration) ) | |
| 582 | 3844 { |
| 623 | 3845 // leading tissue is in IBCD condition and in super-saturation, so issue a warning. |
| 3846 deco_warnings |= (DECO_WARNING_IBCD + DECO_WARNING_IBCD_lock); | |
| 582 | 3847 } |
| 560 | 3848 } |
| 623 | 3849 #endif |
| 3850 | |
| 0 | 3851 } |
| 623 | 3852 |
| 3853 | |
| 0 | 3854 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 3855 // calc_NDL_time_tissue |
| 3856 // | |
| 3857 // calculation of the remaining no decompression limit (NDL) time for a tissue | |
| 0 | 3858 // |
| 604 | 3859 // NOTE: Erik Baker's closed formula works for Nitrox. Trimix adds a second |
| 0 | 3860 // exponential term to the M-value equation, making it impossible to |
| 623 | 3861 // invert. So we have to solve the problem with a search approach. |
| 3862 // | |
| 3863 // Input: NDL_tissue tissue for which to calculate remaining NDL time | |
| 3864 // GF_high gradient factor used when GF factors are enabled | |
| 3865 // ppN2, ppHe partial pressures of N2 and He breathed | |
| 3866 // | |
| 3867 // Modified: NDL_time shortest NDL time found so far | |
| 3868 // NDL_tissue_lead leading tissue, i.e. tissue with the shortest NDL | |
| 3869 // | |
| 3870 static void calc_NDL_time_tissue(void) | |
| 0 | 3871 { |
| 623 | 3872 overlay unsigned char NDL_time_tissue = 0; // NDL time of this tissue, starting with 0 minutes |
| 3873 overlay unsigned char step_size = 10; // step size in searching, starting with 10 minutes | |
| 3874 overlay float pres_limit; // max. tissue pressure allowed | |
| 3875 | |
| 3876 #ifdef _helium | |
| 3877 overlay float last_pres_tissue_N2; // last tissue pressure for N2 | |
| 3878 overlay float last_pres_tissue_He; // last tissue pressure for He | |
| 3879 #else | |
| 3880 overlay float last_pres_tissue; // last tissue pressure | |
| 3881 #endif | |
| 3882 | |
| 3883 | |
| 3884 // set the compartment index ci for reading the Buhlmann increments and coefficients | |
| 3885 ci = NDL_tissue; | |
| 3886 | |
| 3887 // read the tissue increments for a step size of 10 minutes | |
| 3888 read_Buhlmann_times(2); | |
| 3889 | |
| 3890 // read Buhlmann a and b coefficients for tissue ci | |
| 3891 read_Buhlmann_coefficients(); | |
| 3892 | |
| 3893 #ifdef _helium | |
| 3894 | |
| 3895 // get the current simulated tissue pressures | |
| 3896 calc_pres_tissue_N2 = last_pres_tissue_N2 = sim_pres_tissue_N2[ci]; | |
| 3897 calc_pres_tissue_He = last_pres_tissue_He = sim_pres_tissue_He[ci]; | |
| 3898 | |
| 3899 #else | |
| 3900 | |
| 3901 // get the current simulated tissue pressure | |
| 3902 pres_tissue = last_pres_tissue = sim_pres_tissue_N2[ci]; | |
| 3903 | |
| 3904 // set the a and b coefficients | |
| 3905 adopt_Buhlmann_coefficients(); | |
| 3906 | |
| 3907 #endif | |
| 3908 | |
| 3909 // simulate an increasing bottom time and check when the NDL is hit | |
| 3910 for(;;) | |
| 582 | 3911 { |
| 623 | 3912 |
| 3913 #ifdef _helium | |
| 3914 | |
| 3915 // calculate the total tissue pressure | |
| 582 | 3916 pres_tissue = calc_pres_tissue_N2 + calc_pres_tissue_He; |
| 3917 | |
| 623 | 3918 // adopt a and b coefficients to current N2/He ratio inside the tissue |
| 3919 adopt_Buhlmann_coefficients(); | |
| 3920 | |
| 3921 #endif | |
| 3922 | |
| 3923 // compute the maximum tissue pressure allowed to be exposed to an | |
| 3924 // ambient pressure equaling the surface pressure | |
| 631 | 3925 if( char_I_model != 0 ) |
| 623 | 3926 { |
| 3927 // GF model enabled, this equation [2] is the inverse of equation [1] | |
| 3928 pres_limit = (1.0 - GF_high + GF_high / var_b) * pres_surface + GF_high * var_a; | |
| 3929 } | |
| 3930 else | |
| 582 | 3931 { |
| 623 | 3932 // straight Buhlmann |
| 3933 pres_limit = pres_surface / var_b + var_a; | |
| 3934 } | |
| 3935 | |
| 3936 // is the tissue pressure higher than the maximum tissue pressure allowed? | |
| 3937 if( pres_tissue > pres_limit) | |
| 3938 { | |
| 3939 // YES - tissue is outside NDL | |
| 3940 | |
| 3941 // was the tissue outside NDL right from the start? | |
| 3942 if( NDL_time_tissue == 0 ) | |
| 582 | 3943 { |
| 623 | 3944 // YES - search can be aborted |
| 3945 | |
| 3946 // at least one tissue is outside NDL, so overall NDL time is zero | |
| 3947 NDL_time = 0; | |
| 3948 | |
| 3949 // store the number of this tissue as being the leading one | |
| 3950 NDL_tissue_lead = NDL_tissue; | |
| 3951 | |
| 3952 // done | |
| 582 | 3953 break; |
| 3954 } | |
| 3955 | |
| 623 | 3956 // when code execution passes here, the tissue has become |
| 3957 // being outside NDL after doing one or more search steps | |
| 3958 | |
| 3959 // still searching with a step size of 10 minutes? | |
| 3960 if( step_size == 10 ) | |
| 582 | 3961 { |
| 623 | 3962 // YES - retry with smaller step size |
| 3963 | |
| 3964 // go back to last NDL time | |
| 3965 NDL_time_tissue -= 10; | |
| 3966 | |
| 3967 #ifdef _helium | |
| 3968 | |
| 3969 // go back to last pressures | |
| 3970 calc_pres_tissue_N2 = last_pres_tissue_N2; | |
| 3971 calc_pres_tissue_He = last_pres_tissue_He; | |
| 3972 | |
| 3973 #else | |
| 3974 | |
| 3975 // go back to last pressure | |
| 3976 pres_tissue = last_pres_tissue; | |
| 3977 | |
| 3978 #endif | |
| 3979 | |
| 3980 // reduce step size to 1 minute | |
| 3981 step_size = 1; | |
| 3982 | |
| 3983 // read the tissue increments for a step size of 1 minute | |
| 3984 read_Buhlmann_times(1); | |
| 3985 | |
| 3986 // redo search from last pressure & time within NDL with smaller step size | |
| 582 | 3987 continue; |
| 3988 } | |
| 623 | 3989 else |
| 582 | 3990 { |
| 623 | 3991 // NO - already tried with a step size of 1 minute |
| 3992 | |
| 3993 // go back to last NDL time that was within NDL | |
| 3994 NDL_time_tissue -= 1; | |
| 3995 | |
| 3996 // is the NDL time of this tissue shorter than the overall NDL time found so far? | |
| 3997 if( NDL_time_tissue < NDL_time ) | |
| 3998 { | |
| 3999 // YES - set this tissue's NDL time as the new overall NDL time | |
| 4000 NDL_time = NDL_time_tissue; | |
| 4001 | |
| 4002 // - store the number of this tissue as being the leading one | |
| 4003 NDL_tissue_lead = NDL_tissue; | |
| 4004 } | |
| 4005 | |
| 4006 // done | |
| 4007 break; | |
| 582 | 4008 } |
| 623 | 4009 } |
| 4010 else | |
| 582 | 4011 { |
| 623 | 4012 // NO - tissue is still within NDL |
| 4013 | |
| 4014 // The search can be terminated when the NDL time of this tissue | |
| 4015 // exceeds the overall NDL time, thus when a shorter NDL time has | |
| 4016 // already been found with another tissue. | |
| 4017 if( NDL_time_tissue >= NDL_time ) break; | |
| 4018 | |
| 4019 #ifdef _helium | |
| 4020 | |
| 4021 // back-up current tissue pressures | |
| 4022 last_pres_tissue_N2 = calc_pres_tissue_N2; | |
| 4023 last_pres_tissue_He = calc_pres_tissue_He; | |
| 4024 | |
| 4025 #else | |
| 4026 | |
| 4027 // back-up current tissue pressure | |
| 4028 last_pres_tissue = pres_tissue; | |
| 4029 | |
| 4030 #endif | |
| 4031 | |
| 4032 // step forward NDL time of current tissue | |
| 4033 NDL_time_tissue += step_size; | |
| 4034 | |
| 4035 #ifdef _helium | |
| 4036 | |
| 4037 // step forward tissue pressure - N2 | |
| 4038 temp_tissue = (ppN2 - calc_pres_tissue_N2) * var_N2_e; // pressure delta breathed - tissue | |
| 4039 apply_saturation_factors(); // apply safety factor | |
| 4040 calc_pres_tissue_N2 += temp_tissue; // add pressure delta to tissue | |
| 4041 | |
| 4042 // step forward tissue pressure - He | |
| 4043 temp_tissue = (ppHe - calc_pres_tissue_He) * var_He_e; // pressure delta breathed - tissue | |
| 4044 apply_saturation_factors(); // apply safety factor | |
| 4045 calc_pres_tissue_He += temp_tissue; // add pressure delta to tissue | |
| 4046 | |
| 4047 #else | |
| 4048 | |
| 4049 // step forward tissue pressure | |
| 4050 temp_tissue = (ppN2 - pres_tissue ) * var_N2_e; // pressure delta breathed - tissue | |
| 4051 apply_saturation_factors(); // apply safety factor | |
| 4052 pres_tissue += temp_tissue; // add pressure delta to tissue | |
| 4053 | |
| 4054 #endif | |
| 4055 | |
| 582 | 4056 } |
| 623 | 4057 } |
| 0 | 4058 } |
| 4059 | |
| 604 | 4060 |
| 0 | 4061 ////////////////////////////////////////////////////////////////////////////// |
| 4062 // clear_deco_table | |
| 4063 // | |
| 623 | 4064 // Modified: internal_deco_time[] stop durations |
| 4065 // internal_deco_depth[] stop depths | |
| 4066 // internal_deco_gas[] gases used at stops | |
| 0 | 4067 // |
| 4068 static void clear_deco_table(void) | |
| 4069 { | |
| 623 | 4070 for( i = 0; i < NUM_STOPS; ++i ) |
| 582 | 4071 { |
| 623 | 4072 internal_deco_time [i] = 0; |
| 4073 internal_deco_depth[i] = 0; | |
| 4074 internal_deco_gas[i] = 0; | |
| 582 | 4075 } |
| 4076 | |
| 628 | 4077 // reset stop table index and chained stops counter |
| 4078 stop_index = 0; | |
| 4079 chained_stops = 0; | |
| 4080 | |
| 560 | 4081 // clear stop table overflow warning |
| 628 | 4082 deco_warnings &= ~DECO_WARNING_INCOMPLETE; |
| 0 | 4083 } |
| 4084 | |
| 623 | 4085 |
| 0 | 4086 ////////////////////////////////////////////////////////////////////////////// |
| 4087 // update_deco_table | |
| 4088 // | |
| 623 | 4089 // Add time to a stop at char_depth_sim |
| 560 | 4090 // |
| 4091 // It is possible to create stops with a duration of 0 minutes, e.g. to | |
| 4092 // note a gas change "on the fly" while ascending. Therefore the criteria | |
| 604 | 4093 // to have reached the end of the list is depth == 0. |
| 0 | 4094 // |
| 623 | 4095 // Input: char_depth_sim stop's depth, in meters |
| 4096 // sim_gas_current_num gas used at stop, as index 1..5 or 0 for gas 6 | |
| 4097 // time_increment number of minutes to add to the stop | |
| 4098 // | |
| 4099 // Updated: internal_deco_depth[] depth (in meters) of each stop | |
| 4100 // internal_deco_time [] time (in minutes) of each stop | |
| 4101 // internal_deco_gas [] gas used (index 1-5) at each stop | |
| 560 | 4102 // |
| 631 | 4103 static void update_deco_table(PARAMETER unsigned char time_increment) |
| 0 | 4104 { |
| 623 | 4105 assert( char_depth_sim > 0 ); // no stop at surface |
| 560 | 4106 |
| 628 | 4107 |
| 4108 // is there already a stop entry matching with the current depth and gas? | |
| 4109 if( internal_deco_depth[stop_index] == char_depth_sim ) | |
| 4110 if( internal_deco_gas [stop_index] == sim_gas_current_num ) | |
| 560 | 4111 { |
| 628 | 4112 // YES - increment stop time if possible, stop time entries are |
| 4113 // limited to 99 minutes because of display constraints | |
| 4114 if( internal_deco_time[stop_index] < (100 - time_increment) ) | |
| 560 | 4115 { |
| 628 | 4116 // YES - time increment fits into current stop entry, |
| 631 | 4117 // increment stop time |
| 628 | 4118 internal_deco_time[stop_index] += time_increment; |
| 631 | 4119 |
| 4120 // done | |
| 4121 return; | |
| 628 | 4122 } |
| 4123 else | |
| 4124 { | |
| 4125 // NO - A chained stop entry will be created further down in the | |
| 4126 // code to continue the stop, but we will limit the number | |
| 4127 // of chained stop table entries in order to abort an ever- | |
| 4128 // running deco calculation. Too many chained entries? | |
| 4129 if( ++chained_stops >= STOP_CHAINING_LIMIT ) | |
| 560 | 4130 { |
| 631 | 4131 // YES - set warning that calculations took too long |
| 628 | 4132 deco_warnings |= DECO_WARNING_INCOMPLETE; |
| 631 | 4133 |
| 4134 // done | |
| 4135 return; | |
| 560 | 4136 } |
| 4137 } | |
| 628 | 4138 } |
| 4139 | |
| 4140 // the current stop entry does not match the current depth and gas, | |
| 4141 // or hasn't enough room left for the time increment | |
| 4142 | |
| 4143 // is the current stop entry in use? | |
| 4144 if( internal_deco_depth[stop_index] > 0 ) | |
| 4145 { | |
| 4146 // YES - current entry is in use, need to move on | |
| 4147 // to next entry position if possible | |
| 4148 | |
| 4149 // have all entry positions been used up? | |
| 4150 if( stop_index < (NUM_STOPS - 1) ) | |
| 560 | 4151 { |
| 628 | 4152 // NO - move on to next entry position |
| 4153 stop_index += 1; | |
| 4154 } | |
| 4155 else | |
| 4156 { | |
| 631 | 4157 // YES - if run in deco calculator mode, set a warning that there is an overflow in the stops table |
| 4158 if( main_status & CALCULATE_BOTTOM ) deco_warnings |= DECO_WARNING_INCOMPLETE; | |
| 4159 | |
| 4160 // limit runtime via reached TTS (scaled in 1/10 minutes here) | |
| 4161 if( TTS_time > 9999 ) deco_warnings |= DECO_WARNING_INCOMPLETE; | |
| 4162 | |
| 4163 // done | |
| 4164 return; | |
| 560 | 4165 } |
| 4166 } | |
| 4167 | |
| 631 | 4168 // initial use of a new (or the very first) stop entry, store all stop data |
| 628 | 4169 internal_deco_time [stop_index] = time_increment; |
| 4170 internal_deco_depth[stop_index] = char_depth_sim; | |
| 4171 internal_deco_gas [stop_index] = sim_gas_current_num; | |
| 631 | 4172 |
| 4173 // done | |
| 4174 return; | |
| 628 | 4175 } |
| 4176 | |
| 4177 | |
| 4178 ////////////////////////////////////////////////////////////////////////////// | |
| 4179 // publish_deco_table | |
| 4180 // | |
| 4181 // Input: internal_deco_depth[] depth in internal stops table | |
| 4182 // internal_deco_time[] times ... | |
| 4183 // internal_deco_gas[] gases ... | |
| 4184 // | |
| 4185 // Output: char_O_deco_depth[] depth in the external stops table | |
| 4186 // char_O_deco_time[] times ... | |
| 4187 // char_O_deco_gas[] gases ... | |
| 4188 // char_O_deco_time_for_log times in reverse order | |
| 4189 // | |
| 4190 static void publish_deco_table(void) | |
| 4191 { | |
| 4192 overlay unsigned char x = stop_index; | |
| 4193 overlay unsigned char y; | |
| 4194 | |
| 4195 | |
| 4196 // copy depth, time and gas from internal to external stops table | |
| 4197 for( y = 0; y < NUM_STOPS; y++ ) | |
| 4198 { | |
| 4199 char_O_deco_depth[y] = internal_deco_depth[y]; | |
| 4200 char_O_deco_time [y] = internal_deco_time [y]; | |
| 4201 char_O_deco_gas [y] = internal_deco_gas [y]; | |
| 4202 } | |
| 4203 | |
| 4204 // copy times of shallowest stops to logging table | |
| 4205 for(y = 0; y < NUM_STOPS_LOG; x-- ) | |
| 4206 { | |
| 4207 // copy all stops that have a non-null stop time | |
| 4208 if( internal_deco_time[x] ) | |
| 4209 char_O_deco_time_for_log[y++] = internal_deco_time[x]; | |
| 4210 | |
| 4211 // abort if all stops are copied | |
| 4212 if( x == 0) break; | |
| 4213 } | |
| 4214 | |
| 4215 // fill the remainder of the logging table with null | |
| 4216 // if it is not completely filled already | |
| 4217 while( y < NUM_STOPS_LOG ) | |
| 4218 { | |
| 4219 char_O_deco_time_for_log[y++] = 0; | |
| 4220 } | |
| 0 | 4221 } |
| 4222 | |
| 4223 | |
| 4224 ////////////////////////////////////////////////////////////////////////////// | |
| 623 | 4225 // calc_desaturation_time_helper |
| 0 | 4226 // |
| 560 | 4227 // Helper function |
| 4228 // | |
| 623 | 4229 // Input: pres_actual current tissue pressure |
| 4230 // pres_target target tissue pressure | |
| 4231 // var_ht half-time of the tissue | |
| 4232 // desat_factor desaturation factor | |
| 4233 // | |
| 4234 // Output: int_time time needed by tissue to reach target pressure | |
| 4235 // | |
| 604 | 4236 static void calc_desaturation_time_helper(void) |
| 0 | 4237 { |
| 623 | 4238 // check if actual pressure is higher then target pressure |
| 4239 if( pres_actual > pres_target ) | |
| 4240 { | |
| 4241 // YES - compute remaining time | |
| 4242 | |
| 604 | 4243 overlay float pres_ratio; |
| 582 | 4244 |
| 623 | 4245 // compute pressure ratio to archive |
| 560 | 4246 pres_ratio = pres_actual / pres_target; |
| 4247 | |
| 4248 // Compute desaturation time with result rounded up to multiples of 10 minutes. | |
| 582 | 4249 // Main purpose is to avoid confusion, because the times do not clock down in |
| 4250 // one minute steps any more but get constantly re-computed according to current | |
| 4251 // ambient pressure and may therefor make steps of several minutes forwards and | |
| 604 | 4252 // backwards as ambient pressure rises/falls and N2/He ratio is being adjusted. |
| 623 | 4253 int_time = (unsigned short)( (var_ht * log(pres_ratio) / desat_factor) + 0.9 ); |
| 560 | 4254 } |
| 4255 else | |
| 623 | 4256 { |
| 4257 // NO - desaturation state reached, no remaining time | |
| 582 | 4258 int_time = 0; |
| 560 | 4259 } |
| 4260 } | |
| 4261 | |
| 623 | 4262 |
| 560 | 4263 ///////////////////////////////////////////////////////////////////////////// |
| 604 | 4264 // calc_desaturation_time |
| 4265 // | |
| 623 | 4266 // Calculates the time needed for the tissues to equilibrate with |
| 4267 // surface pressure and the no-fly / no-altitude time. | |
| 4268 // | |
| 4269 // Input: int_I_pres_surface | |
| 4270 // char_I_desaturation_multiplier | |
| 4271 // | |
| 4272 // Output: int_O_desaturation_time | |
| 4273 // int_O_nofly_time | |
| 560 | 4274 // |
| 4275 void calc_desaturation_time(void) | |
| 4276 { | |
| 623 | 4277 overlay float P_ambient_altitude; |
| 4278 | |
| 604 | 4279 assert( 800 < int_I_pres_surface && int_I_pres_surface < 1100 ); |
| 4280 assert( 0 < char_I_desaturation_multiplier && char_I_desaturation_multiplier <= 100 ); | |
| 4281 | |
| 4282 | |
| 623 | 4283 // safeguard and convert surface pressure |
| 4284 if( int_I_pres_surface < 500) pres_surface = 0.5; | |
| 4285 else pres_surface = 0.001 * int_I_pres_surface; | |
| 4286 | |
| 4287 // calculate partial pressure of N2 in respired air at surface pressure | |
| 4288 calc_N2_equilibrium(); | |
| 4289 | |
| 4290 // get, safeguard and convert the saturation and desaturation factors | |
| 4291 get_saturation_factors(); | |
| 4292 | |
| 4293 // pre-computed term for later use: 10 [Min] * 0.6931 [=log(2)] * 1 [Desat Factor] * ... | |
| 4294 desat_factor = (6.931 * SURFACE_DESAT_FACTOR) * float_desaturation_multiplier; | |
| 582 | 4295 |
| 4296 // initialize vars | |
| 560 | 4297 int_O_desaturation_time = 0; |
| 582 | 4298 int_O_nofly_time = 0; |
| 4299 | |
| 623 | 4300 // get selected target altitude |
| 4301 switch( char_I_altitude_wait ) | |
| 4302 { | |
| 4303 case 1: P_ambient_altitude = P_ambient_1000m; break; | |
| 4304 case 2: P_ambient_altitude = P_ambient_2000m; break; | |
| 4305 case 3: P_ambient_altitude = P_ambient_3000m; break; | |
| 4306 default: P_ambient_altitude = P_ambient_fly; break; | |
| 4307 } | |
| 4308 | |
| 4309 // loop over all compartments in order slowest to fastest | |
| 604 | 4310 for( ci = NUM_COMP; ci > 0; ) |
| 582 | 4311 { |
| 623 | 4312 overlay float pres_tissue_max; |
| 4313 overlay unsigned short nofly_last = ~0; | |
| 4314 overlay unsigned short nofly_N2 = 0; | |
| 4315 | |
| 4316 #ifdef _helium | |
| 4317 overlay signed char search_direction; | |
| 4318 overlay unsigned short nofly_He = 0; | |
| 4319 #endif | |
| 4320 | |
| 4321 | |
| 4322 // decrement compartment index | |
| 560 | 4323 ci -= 1; |
| 582 | 4324 |
| 623 | 4325 // get the Buhlmann halftimes and coefficients |
| 582 | 4326 read_Buhlmann_ht(); |
| 560 | 4327 read_Buhlmann_coefficients(); |
| 582 | 4328 |
| 623 | 4329 |
| 4330 // | |
| 4331 // Desaturation time | |
| 4332 // | |
| 4333 | |
| 4334 // calculate desaturation time for N2 in tissue, | |
| 4335 // desaturated state is defined as residual tissue pressure <= 1.05 x ppN2 respired | |
| 4336 | |
| 4337 // current tissue pressure above equilibrium pressure | |
| 4338 pres_actual = real_pres_tissue_N2[ci] - N2_equilibrium; | |
| 4339 | |
| 4340 // target pressure above equilibrium pressure | |
| 4341 pres_target = 0.05 * N2_equilibrium; | |
| 4342 | |
| 4343 // half-time of the current tissue | |
| 4344 var_ht = var_N2_ht; | |
| 4345 | |
| 4346 // calculate desaturation time | |
| 4347 calc_desaturation_time_helper(); | |
| 4348 | |
| 4349 // store desaturation time if it is longer than longest found so far | |
| 4350 if( int_time > int_O_desaturation_time) int_O_desaturation_time = int_time; | |
| 4351 | |
| 4352 | |
| 4353 #ifdef _helium | |
| 4354 | |
| 4355 // calculate desaturation time for He in the tissue, | |
| 4356 // desaturated state is defined as residual tissue pressure <= 0.05 x ppN2 respired | |
| 4357 | |
| 4358 // actual tissue pressure above equilibrium: equilibrium for He is 0 bar | |
| 4359 pres_actual = real_pres_tissue_He[ci]; | |
| 4360 | |
| 4361 // target pressure above equilibrium pressure: use same target pressure as for N2 | |
| 4362 pres_target = 0.05 * N2_equilibrium; | |
| 4363 | |
| 4364 // half-time of the current tissue | |
| 4365 var_ht = var_He_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 #endif | |
| 4374 | |
| 4375 // | |
| 4376 // no-fly time | |
| 4377 // | |
| 582 | 4378 |
| 560 | 4379 // Target pressure for the tissue is the Buhlmann limit. We use the Buhlmann |
| 4380 // coefficients for N2 also for He because it is easier to calculate and the | |
| 4381 // N2 coefficients are more conservative than those for He, so we are on the | |
| 4382 // safe side, too. | |
| 582 | 4383 pres_tissue_max = (P_ambient_altitude/var_N2_b + var_N2_a); |
| 4384 | |
| 623 | 4385 // adjust target pressure by GF-high in case the GF model is in use, but not |
| 4386 // for the no-fly time as it's target pressure is hard to reach anyhow | |
| 631 | 4387 if( char_I_model && char_I_altitude_wait ) |
| 623 | 4388 pres_tissue_max = P_ambient_altitude + |
| 4389 0.01 * char_I_GF_High_percentage * (pres_tissue_max - P_ambient_altitude); | |
| 4390 | |
| 4391 | |
| 4392 #ifdef _helium | |
| 4393 | |
| 4394 //---- Variant with Helium ------------------------------------------- | |
| 4395 | |
| 4396 // initialize split_N2_He in case there was a hard reboot / memory clear | |
| 604 | 4397 if( split_N2_He[ci] == 0 ) split_N2_He[ci] = 90; |
| 4398 | |
| 560 | 4399 // initialize search direction |
| 4400 search_direction = 0; | |
| 582 | 4401 |
| 560 | 4402 for(;;) |
| 4403 { | |
| 4404 // Calculate no-fly time for N2 in the tissue. | |
| 4405 // Flying is permitted when the N2 pressure fits into the assigned fraction above equilibrium. | |
| 4406 | |
| 623 | 4407 // current tissue pressure above equilibrium |
| 4408 pres_actual = real_pres_tissue_N2[ci] - N2_equilibrium; | |
| 4409 | |
| 4410 // target pressure above equilibrium pressure, weighted by N2/He split | |
| 560 | 4411 pres_target = (split_N2_He[ci] * 0.01) * (pres_tissue_max - N2_equilibrium); |
| 4412 | |
| 623 | 4413 // half-time of the current tissue |
| 4414 var_ht = var_N2_ht; | |
| 4415 | |
| 4416 // check if desaturation to target pressure is possible at all | |
| 4417 if( pres_target < 0.0 ) | |
| 560 | 4418 { |
| 623 | 4419 // NO - set no-fly time to 288 * 10 min = 48 h |
| 4420 int_O_nofly_time = 288; | |
| 4421 break; | |
| 560 | 4422 } |
| 604 | 4423 else |
| 560 | 4424 { |
| 623 | 4425 // YES - calculate desaturation time |
| 560 | 4426 calc_desaturation_time_helper(); |
| 623 | 4427 |
| 4428 // store time found | |
| 582 | 4429 nofly_N2 = int_time; |
| 560 | 4430 } |
| 582 | 4431 |
| 623 | 4432 // calculate no-fly time for He in the tissue, |
| 4433 // flying is permitted when the He pressure fits into the assigned fraction | |
| 4434 | |
| 4435 // current tissue pressure above equilibrium: equilibrium for He is 0 bar | |
| 4436 pres_actual = real_pres_tissue_He[ci]; | |
| 4437 | |
| 4438 // target pressure above equilibrium pressure, weighted by N2/He split | |
| 4439 pres_target = ((100 - split_N2_He[ci]) * 0.01) * (pres_tissue_max - N2_equilibrium); | |
| 4440 | |
| 4441 // half-time of the current tissue | |
| 582 | 4442 var_ht = var_He_ht; |
| 4443 | |
| 623 | 4444 // calculate desaturation time |
| 560 | 4445 calc_desaturation_time_helper(); |
| 623 | 4446 |
| 4447 // store time found | |
| 582 | 4448 nofly_He = int_time; |
| 560 | 4449 |
| 4450 | |
| 4451 // Because the sum of N2 and He tissue pressures needs to fit into the Buhlmann limit for | |
| 4452 // no-fly time calculation, each gas gets assigned a fraction of the available total pressure | |
| 623 | 4453 // limit. The optimum split between the two gases can not be computed by a single formula, |
| 560 | 4454 // because this would require the inversion of a function with two exponential terms, which is |
| 4455 // not possible. We do not want to do a computational complex simulation here like it is done | |
| 4456 // in the deco calculation code (although we tackle the same base problem here), so we just let | |
| 4457 // the computer try out which split will balance the no-fly times induced by the N2 and the He | |
| 4458 // at best. | |
| 582 | 4459 |
| 560 | 4460 // first of all, skip any optimization in case the current compartment is not the leading one |
| 4461 if( (nofly_N2 <= int_O_nofly_time) && (nofly_He <= int_O_nofly_time) ) break; | |
| 4462 | |
| 4463 // check if the N2 requires more waiting time than the He | |
| 582 | 4464 if( nofly_N2 >= nofly_He ) |
| 560 | 4465 { |
| 4466 // check if the search direction has changed, which means we are beyond the | |
| 4467 // optimum now, or if we are at the upper stop limit of split_N2_He | |
| 4468 if( (search_direction < 0) || (split_N2_He[ci] == 99) ) | |
| 604 | 4469 { |
| 623 | 4470 // either the just completed iteration was more close to the optimum or the one before |
| 4471 // was, so we take the best (i.e. shortest) time of both as the final no-fly time | |
| 560 | 4472 int_O_nofly_time = (nofly_N2 < nofly_last) ? nofly_N2 : nofly_last; |
| 623 | 4473 |
| 4474 // done | |
| 560 | 4475 break; |
| 4476 } | |
| 4477 | |
| 4478 // store the no-fly time found in this iteration | |
| 582 | 4479 nofly_last = nofly_N2; |
| 4480 | |
| 623 | 4481 // increase the N2 fraction of the split |
| 560 | 4482 split_N2_He[ci] += 1; |
| 623 | 4483 |
| 4484 // set search direction towards more N2 | |
| 560 | 4485 search_direction = +1; |
| 4486 } | |
| 4487 else | |
| 4488 { | |
| 4489 // check if the search direction has changed, which means we are beyond the | |
| 4490 // optimum now, or if we are at the lower stop limit of split_N2_He | |
| 4491 if( (search_direction > 0) || (split_N2_He[ci] == 1) ) | |
| 582 | 4492 { |
| 623 | 4493 // either the just completed iteration was more close to the optimum or the one before |
| 4494 // was, so we take the best (i.e. shortest) time of both as the final no-fly time | |
| 560 | 4495 int_O_nofly_time = (nofly_He < nofly_last) ? nofly_He : nofly_last; |
| 623 | 4496 |
| 4497 // done | |
| 560 | 4498 break; |
| 4499 } | |
| 4500 | |
| 4501 // store the no-fly time found in this iteration | |
| 582 | 4502 nofly_last = nofly_He; |
| 4503 | |
| 623 | 4504 // decrease the N2 fraction of the split |
| 560 | 4505 split_N2_He[ci] -= 1; |
| 623 | 4506 |
| 4507 // set search direction towards less N2 | |
| 604 | 4508 search_direction = -1; |
| 560 | 4509 } |
| 582 | 4510 |
| 560 | 4511 } // for(;;) |
| 4512 | |
| 623 | 4513 #else |
| 4514 | |
| 4515 //---- Variant without Helium ---------------------------------------- | |
| 4516 | |
| 4517 // current tissue pressure above equilibrium | |
| 4518 pres_actual = real_pres_tissue_N2[ci] - N2_equilibrium; | |
| 4519 | |
| 4520 // target pressure above equilibrium pressure | |
| 4521 pres_target = pres_tissue_max - N2_equilibrium; | |
| 4522 | |
| 4523 // half-time of the current tissue | |
| 4524 var_ht = var_N2_ht; | |
| 4525 | |
| 4526 // check if desaturation to target pressure is possible at all | |
| 4527 if( pres_target < 0.0 ) | |
| 4528 { | |
| 4529 // NO - set no-fly time to 288 * 10 min = 48 h | |
| 4530 int_O_nofly_time = 288; | |
| 4531 } | |
| 4532 else | |
| 4533 { | |
| 4534 // YES - calculate desaturation time | |
| 4535 calc_desaturation_time_helper(); | |
| 4536 | |
| 4537 // - extend desaturation time if this tissue needs | |
| 4538 // more time than already found to be needed | |
| 4539 if( int_time > int_O_nofly_time ) int_O_nofly_time = int_time; | |
| 4540 } | |
| 4541 | |
| 4542 #endif | |
| 4543 | |
| 560 | 4544 } // for(compartments) |
| 4545 | |
| 582 | 4546 |
| 623 | 4547 // rescale int_O_desaturation_time and int_O_nofly_time to full minutes for display purpose |
| 560 | 4548 int_O_desaturation_time *= 10; |
| 4549 int_O_nofly_time *= 10; | |
| 582 | 4550 |
| 623 | 4551 // limit int_O_desaturation_time and int_O_nofly_time to 5999 = 99 hours + 59 minutes |
| 4552 // because of display space constraints and rounding done above | |
| 560 | 4553 if( int_O_desaturation_time > 5999 ) int_O_desaturation_time = 5999; |
| 4554 if( int_O_nofly_time > 5999 ) int_O_nofly_time = 5999; | |
| 4555 | |
| 4556 | |
| 623 | 4557 // Clear the micro bubbles warning when the current gradient factor is < 100%. |
| 604 | 4558 // The current gradient factor is calculated by calc_interval() while not in diving mode. |
| 4559 // As the locked warning will stay set, this will cause the warning be be displayed in | |
| 4560 // attention color instead of warning color. | |
| 623 | 4561 if( int_O_lead_supersat < 100 ) |
| 4562 deco_warnings &= ~DECO_WARNING_MBUBBLES; | |
| 582 | 4563 |
| 560 | 4564 // clear some warnings when the desaturation time has become zero |
| 582 | 4565 if( int_O_desaturation_time == 0 ) |
| 623 | 4566 deco_warnings &= ~( DECO_WARNING_IBCD + DECO_WARNING_IBCD_lock |
| 4567 + DECO_WARNING_MBUBBLES + DECO_WARNING_MBUBBLES_lock | |
| 4568 + DECO_WARNING_OUTSIDE + DECO_WARNING_OUTSIDE_lock | |
| 4569 + DECO_ATTENTION_OUTSIDE ); | |
| 0 | 4570 } |
| 4571 | |
| 623 | 4572 |
| 0 | 4573 ////////////////////////////////////////////////////////////////////////////// |
| 582 | 4574 // Calculate desaturation of the real tissues for a given time interval |
| 0 | 4575 // |
| 582 | 4576 // Caution: Works on the real tissues! |
| 4577 // If in doubt, use this function only inside a context surrounded with | |
| 4578 // push_tissues_to_vault() / pull_tissues_from_vault() ! | |
| 4579 // | |
| 623 | 4580 // Input: int_I_pres_surface surface pressure in mbar |
| 4581 // time_interval time interval in minutes, must be limited to 254 at max | |
| 4582 // | |
| 4583 // Modified: tissue pressures N2 and He pressures of the tissues | |
| 4584 // CNS_fraction_real current real CNS value | |
| 631 | 4585 // ceiling minimum allowed depth in bar relative pressure |
| 623 | 4586 // lead_supersat supersaturation of the leading tissue (float) |
| 4587 // int_O_lead_supersat supersaturation of the leading tissue (integer) | |
| 631 | 4588 // char_O_lead_tissue number of the leading tissue |
| 560 | 4589 // |
| 582 | 4590 static void calc_interval(PARAMETER unsigned char time_interval) |
| 0 | 4591 { |
| 582 | 4592 overlay unsigned char time; |
| 4593 | |
| 4594 assert( 800 < int_I_pres_surface && int_I_pres_surface < 1100 ); | |
| 604 | 4595 assert( 100 <= char_I_saturation_multiplier && char_I_saturation_multiplier < 200 ); |
| 4596 assert( 0 < char_I_desaturation_multiplier && char_I_desaturation_multiplier <= 100 ); | |
| 4597 | |
| 4598 | |
| 623 | 4599 // safeguard and convert surface pressure |
| 4600 if( int_I_pres_surface < 500) pres_surface = 0.500; | |
| 4601 else pres_surface = 0.001 * int_I_pres_surface; | |
| 4602 | |
| 631 | 4603 // safeguard time interval |
| 4604 if( time_interval > 254 ) time_interval = 254; | |
| 4605 | |
| 623 | 4606 // set breathed pressure to surface pressure |
| 4607 real_pres_respiration = pres_surface; | |
| 4608 | |
| 4609 // calculate partial pressure of N2 in respired air at surface pressure | |
| 4610 calc_N2_equilibrium(); | |
| 4611 | |
| 4612 // calculate partial pressures (0.7902 is fraction of N2 in atmosphere as of Buhlmann) | |
| 4613 ppN2 = N2_equilibrium; | |
| 4614 ppHe = 0.0; | |
| 4615 | |
| 4616 // get, safeguard and convert the saturation and desaturation factors | |
| 4617 get_saturation_factors(); | |
| 4618 | |
| 4619 // adjust desaturation factor to surface mode | |
| 4620 float_desaturation_multiplier *= SURFACE_DESAT_FACTOR; | |
| 582 | 4621 |
| 4622 // Calculate the tissues: | |
| 4623 // Because calc_tissues() can calculate for 127 minutes at max, | |
| 4624 // the tissue updating may need to be done in two chunks. | |
| 4625 | |
| 4626 time = time_interval; | |
| 4627 | |
| 4628 // first chunk for the part exceeding 127 minutes | |
| 4629 if( time > 127) | |
| 560 | 4630 { |
| 582 | 4631 // do a full 127 minutes on the real tissues |
| 623 | 4632 tissue_increment = TISSUE_SELECTOR | 127; |
| 582 | 4633 calc_tissues(); |
| 4634 | |
| 623 | 4635 // determine the remaining time |
| 582 | 4636 time -= 127; |
| 560 | 4637 } |
| 4638 | |
| 623 | 4639 // program the remaining time (or full time if not exceeding 127 minutes) on the real tissues |
| 4640 tissue_increment = TISSUE_SELECTOR | time; | |
| 604 | 4641 |
| 4642 // update the N2 and He pressures in the tissues | |
| 582 | 4643 calc_tissues(); |
| 4644 | |
| 560 | 4645 |
| 4646 // Calculate CNS: | |
| 4647 // To speed up things and because on most invocations of this code char_I_dive_interval | |
| 4648 // is a multiple of 10 minutes, we loop the loop-counter down using two speeds. | |
| 4649 | |
| 582 | 4650 time = time_interval; |
| 4651 | |
| 604 | 4652 while( time ) |
| 560 | 4653 { |
| 582 | 4654 if( time > 9 ) |
| 560 | 4655 { |
| 623 | 4656 CNS_fraction_real *= 0.925874712; // half-time = 90 min -> 10 min: (1/2)^(1/9) |
| 4657 time -= 10; // fast speed looping | |
| 560 | 4658 } |
| 4659 else | |
| 4660 { | |
| 623 | 4661 CNS_fraction_real *= 0.992327946; // half-time = 90 min -> 1 min: (1/2)^(1/90) |
| 4662 time -= 1; // slow speed looping | |
| 560 | 4663 } |
| 582 | 4664 } |
| 560 | 4665 |
| 623 | 4666 // convert the CNS value to integer |
| 4667 convert_cur_CNS_for_display(); | |
| 4668 | |
| 4669 // calculate the supersaturation of the leading tissue, the | |
| 4670 // negative argument puts calc_limit() into surface mode | |
| 4671 // Attention: do not pass char_I_GF_High_percentage as an argument | |
| 4672 // here because it is not configured outside dive mode | |
| 4673 calc_limit(-1.0); | |
| 4674 | |
| 4675 // convert the saturation value of the leading tissue to integer | |
| 4676 convert_sat_for_display(); | |
| 0 | 4677 } |
| 4678 | |
| 560 | 4679 |
| 4680 ////////////////////////////////////////////////////////////////////////////// | |
| 604 | 4681 // calc_CNS |
| 560 | 4682 // |
| 623 | 4683 // Input: char_ppO2 current ppO2 [in 0.1 bars] |
| 631 | 4684 // tissue_increment tissue selector and time interval |
| 623 | 4685 // |
| 4686 // Modified: CNS_fraction_real accumulated CNS (real tissue context) | |
| 4687 // CNS_fraction_sim accumulated CNS (simulated tissue context) | |
| 560 | 4688 // |
| 604 | 4689 static void calc_CNS(void) |
| 560 | 4690 { |
| 604 | 4691 overlay float CNS_fraction_inc; // increment of CNS load, 0.01 = 1% |
| 623 | 4692 |
| 4693 | |
| 631 | 4694 // calculate CNS increment for a 2 seconds interval |
| 623 | 4695 if( char_ppO2 > 160 ) |
| 4696 { | |
| 4697 // step-wise CNS increment | |
| 4698 | |
| 631 | 4699 // calculate index for increment look-up (uses integer division) |
| 4700 cns_i = (char_ppO2 - 161) / 5; | |
| 623 | 4701 |
| 628 | 4702 // indexes > 17 use increment of index 17 |
| 4703 if( cns_i > 17 ) cns_i = 17; | |
| 4704 | |
| 623 | 4705 // read coefficient (increment) |
| 4706 read_CNS_c_coefficient(); | |
| 4707 | |
| 4708 // re-scale coefficient from storage format in [1/100000] to productive value | |
| 631 | 4709 CNS_fraction_inc = (float)var_cns_value / 100000.0; |
| 623 | 4710 } |
| 4711 else if( char_ppO2 > 50 ) | |
| 4712 { | |
| 4713 // range wise CNS increment approximation | |
| 4714 | |
| 631 | 4715 // calculate index for approximation coefficients look-up (uses integer division) |
| 4716 cns_i = (char_ppO2 - 51) / 10; | |
| 623 | 4717 |
| 4718 // read coefficients | |
| 4719 read_CNS_ab_coefficient(); | |
| 4720 | |
| 4721 // calculate the CNS increment | |
| 631 | 4722 CNS_fraction_inc = 1.0 / (var_cns_gain * char_ppO2 + var_cns_offset ); |
| 623 | 4723 } |
| 4724 else | |
| 631 | 4725 { // no increment for a ppO2 of up to 0.5 bar |
| 623 | 4726 CNS_fraction_inc = 0.0; |
| 4727 } | |
| 4728 | |
| 631 | 4729 // apply a time factor in case of: |
| 4730 // - simulated tissues and interval = 0 (i.e. 6 seconds to do) -> factor 3 | |
| 4731 // - any tissues and interval > 0 (i.e. i minutes to do) -> factor 30 * i | |
| 4732 if( tissue_increment == 0 ) CNS_fraction_inc *= 3.0; | |
| 4733 else if( tissue_increment & TIME_MASK ) CNS_fraction_inc *= 30.0 * (float)(tissue_increment & TIME_MASK); | |
| 4734 | |
| 604 | 4735 |
| 4736 // update the CNS accumulator | |
| 623 | 4737 if ( tissue_increment & TISSUE_SELECTOR ) CNS_fraction_real += CNS_fraction_inc; // real tissues |
| 4738 else CNS_fraction_sim += CNS_fraction_inc; // simulated tissues | |
| 4739 } | |
| 4740 | |
| 4741 | |
| 4742 ////////////////////////////////////////////////////////////////////////////// | |
| 631 | 4743 // calc_required_volume |
| 623 | 4744 // |
| 4745 // Calculates the gas volume required for a given depth, time and usage (SAC) | |
| 4746 // rate. It uses a fixed surface pressure of 1.0 bar to deliver stable results | |
| 4747 // when used through the deco calculator. | |
| 4748 // | |
| 628 | 4749 // Input: gas_needs_depth depth in meters |
| 631 | 4750 // gas_needs_time time in minutes (0 encodes 1/10 minute) |
| 628 | 4751 // gas_needs_usage_rate gas usage in liters per minute at surface pressure |
| 623 | 4752 // |
| 628 | 4753 // Output: gas_needs_volume_due required gas volume in liters |
| 623 | 4754 // |
| 631 | 4755 static void calc_required_volume(void) |
| 623 | 4756 { |
| 631 | 4757 // calculate volume for 1 minute |
| 4758 gas_needs_volume_due = ((float)gas_needs_depth * METER_TO_BAR + pres_surface) * gas_needs_usage_rate; | |
| 4759 | |
| 4760 // multiply 1-minute-volume with time factor if time factor <> 1 | |
| 4761 if ( gas_needs_time == 0 ) gas_needs_volume_due *= 0.1; // 1/10 minute | |
| 4762 else if ( gas_needs_time > 1 ) gas_needs_volume_due *= gas_needs_time; // multiple minutes | |
| 0 | 4763 } |
| 4764 | |
| 560 | 4765 |
| 631 | 4766 |
| 4767 #ifdef _rx_functions | |
| 4768 | |
| 0 | 4769 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 4770 // calc_TR_functions |
| 4771 // | |
| 4772 // Process Pressure Readings (OSTC TR only) | |
| 4773 // | |
| 4774 // Input: todo | |
| 4775 // | |
| 4776 // Output: todo | |
| 4777 // | |
| 4778 static void calc_TR_functions(void) | |
| 560 | 4779 { |
| 623 | 4780 // pressure warnings for reading 1, but only if enabled and pressure value available |
| 4781 if( (char_I_pressure_gas[0] > 0) && !(int_IO_pressure_value[0] & INT_FLAG_NOT_AVAIL) ) | |
| 604 | 4782 { |
| 623 | 4783 overlay unsigned short pressure_value = int_IO_pressure_value[0] & ~INT_FLAG_OUTDATED; |
| 4784 | |
| 4785 if( (char_I_pressure_gas[0] < 6 ) && !(int_O_pressure_need[0] & INT_FLAG_NOT_AVAIL) ) | |
| 4786 { | |
| 4787 // not a diluent and need available: warning & attention by need | |
| 4788 if ( pressure_value <= int_O_pressure_need[0]) | |
| 4789 int_IO_pressure_value[0] |= INT_FLAG_WARNING; | |
| 4790 else if( pressure_value <= int_O_pressure_need[0] + int_O_pressure_need[0] / 2 ) | |
| 4791 int_IO_pressure_value[0] |= INT_FLAG_ATTENTION; | |
| 4792 } | |
| 4793 else | |
| 4794 { | |
| 4795 // a diluent or need not available: warning & attention by fixed thresholds | |
| 4796 if ( pressure_value <= PRESSURE_LIMIT_WARNING ) int_IO_pressure_value[0] |= INT_FLAG_WARNING; | |
| 4797 else if ( pressure_value <= PRESSURE_LIMIT_ATTENTION ) int_IO_pressure_value[0] |= INT_FLAG_ATTENTION; | |
| 4798 } | |
| 604 | 4799 } |
| 4800 | |
| 623 | 4801 // pressure warnings for reading 2, but only if enabled and pressure value available |
| 4802 if( (char_I_pressure_gas[1] > 0) && !(int_IO_pressure_value[1] & INT_FLAG_NOT_AVAIL) ) | |
| 560 | 4803 { |
| 623 | 4804 overlay unsigned short pressure_value = int_IO_pressure_value[1] & ~INT_FLAG_OUTDATED; |
| 4805 | |
| 4806 if( (char_I_pressure_gas[1] < 6 ) && !(int_O_pressure_need[1] & INT_FLAG_NOT_AVAIL) ) | |
| 560 | 4807 { |
| 623 | 4808 // not a diluent and need available: warning & attention by need |
| 4809 if ( pressure_value <= int_O_pressure_need[1]) | |
| 4810 int_IO_pressure_value[1] |= INT_FLAG_WARNING; | |
| 4811 else if ( pressure_value <= int_O_pressure_need[1] + int_O_pressure_need[1] / 2 ) | |
| 4812 int_IO_pressure_value[1] |= INT_FLAG_ATTENTION; | |
| 560 | 4813 } |
| 4814 else | |
| 4815 { | |
| 623 | 4816 // a diluent or need not available: warning & attention by fixed thresholds |
| 4817 if ( pressure_value <= PRESSURE_LIMIT_WARNING ) int_IO_pressure_value[1] |= INT_FLAG_WARNING; | |
| 4818 else if ( pressure_value <= PRESSURE_LIMIT_ATTENTION ) int_IO_pressure_value[1] |= INT_FLAG_ATTENTION; | |
| 560 | 4819 } |
| 4820 } | |
| 582 | 4821 |
| 623 | 4822 //--- SAC Calculation --------------------------------------------------------------------- |
| 4823 // | |
| 4824 // char_I_SAC_mode =0: disabled | |
| 4825 // =1: SAC from 1st reading | |
| 4826 // =2: SAC from 2nd reading | |
| 4827 // =3: SAC from higher one of both pressure drops (independent double mode) | |
| 4828 // =4: SAC (O2 usage) from 2nd reading without real_pres_respiration term | |
| 4829 | |
| 4830 // set SAC rate to not available by default | |
| 4831 int_O_SAC_measured = 0 + INT_FLAG_NOT_AVAIL; | |
| 4832 | |
| 4833 // get a copy of the current absolute pressure | |
| 4834 pres_respiration_sac = real_pres_respiration; | |
| 4835 | |
| 4836 // set threshold for SAC rate attention | |
| 628 | 4837 max_sac_rate = (deco_info & DECO_MODE) ? char_I_SAC_deco : char_I_SAC_work; |
| 623 | 4838 |
| 4839 // char_I_SAC_deco / char_I_SAC_work are in l/min, max_sac_rate is in 0.1 l/min | |
| 4840 max_sac_rate *= 10; | |
| 4841 | |
| 4842 | |
| 4843 // pre-process SAC mode 3 (independent double) | |
| 4844 if( char_I_SAC_mode == 3 ) | |
| 560 | 4845 { |
| 623 | 4846 overlay unsigned char reading1_gas; |
| 4847 overlay unsigned char reading2_gas; | |
| 4848 overlay unsigned char reading1_tanksize; | |
| 4849 overlay unsigned char reading2_tanksize; | |
| 4850 overlay unsigned short reading1_press; | |
| 4851 overlay unsigned short reading2_press; | |
| 4852 overlay unsigned short reading1_drop; | |
| 4853 overlay unsigned short reading2_drop; | |
| 4854 | |
| 4855 // get gas numbers (1-10) of both readings | |
| 4856 reading1_gas = char_I_pressure_gas[0]; | |
| 4857 reading2_gas = char_I_pressure_gas[1]; | |
| 4858 | |
| 4859 // default to no SAC calculation | |
| 4860 char_I_SAC_mode = 0; | |
| 4861 | |
| 4862 // clear switch advice by default | |
| 4863 deco_info &= ~IND_DOUBLE_SWITCH_FLAG; | |
| 4864 | |
| 4865 // check if both readings are configured and available | |
| 4866 if( reading1_gas ) | |
| 4867 if( reading2_gas ) | |
| 4868 if( !(int_IO_pressure_value[0] & INT_FLAG_NOT_AVAIL) ) | |
| 4869 if( !(int_IO_pressure_value[1] & INT_FLAG_NOT_AVAIL) ) | |
| 4870 if( !(int_I_pressure_drop[0] & INT_FLAG_NOT_AVAIL) ) | |
| 4871 if( !(int_I_pressure_drop[1] & INT_FLAG_NOT_AVAIL) ) | |
| 560 | 4872 { |
| 623 | 4873 // get tank pressures, stripping flags |
| 4874 reading1_press = int_IO_pressure_value[0] & 0x0FFF; // in 0.1 bar | |
| 4875 reading2_press = int_IO_pressure_value[1] & 0x0FFF; // in 0.1 bar | |
| 4876 | |
| 4877 // get pressure drops as integers, stripping flags and shifting right | |
| 4878 // to avoid an overflow when multiplying with the tank size later on | |
| 4879 reading1_drop = (int_I_pressure_drop[0] & 0x0FFF) >> 2; | |
| 4880 reading2_drop = (int_I_pressure_drop[1] & 0x0FFF) >> 2; | |
| 4881 | |
| 4882 // get tank sizes | |
| 4883 reading1_tanksize = char_I_gas_avail_size[reading1_gas-1]; | |
| 4884 reading2_tanksize = char_I_gas_avail_size[reading2_gas-1]; | |
| 4885 | |
| 4886 // set mode to calculate SAC on the reading with the higher absolute drop | |
| 4887 char_I_SAC_mode = (reading1_drop * reading1_tanksize > reading2_drop * reading2_tanksize) ? 1 : 2; | |
| 4888 | |
| 4889 // compute switch advice if pressure (in 0.1 bar) of tank breathed from is | |
| 4890 // more than char_I_max_pres_diff (in bar) below pressure of the other tank. | |
| 4891 if( char_I_SAC_mode == 1 ) | |
| 4892 { | |
| 4893 // breathing from reading 1, switch advice if pressure on reading 1 lower than on 2 | |
| 4894 if( (reading1_press + 10*char_I_max_pres_diff) <= reading2_press ) | |
| 4895 deco_info |= IND_DOUBLE_SWITCH_FLAG; | |
| 4896 } | |
| 4897 else | |
| 4898 { | |
| 4899 // breathing from reading 2, switch advice if pressure on reading 2 lower than on 1 | |
| 4900 if( (reading2_press + 10*char_I_max_pres_diff) <= reading1_press ) | |
| 4901 deco_info |= IND_DOUBLE_SWITCH_FLAG; | |
| 4902 } | |
| 560 | 4903 } |
| 4904 } | |
| 4905 | |
| 623 | 4906 |
| 4907 // pre-process SAC mode 4 (O2 usage by reading 2) | |
| 4908 if( char_I_SAC_mode == 4 ) | |
| 4909 { | |
| 4910 // O2 usage on CCR is independent from absolute pressure | |
| 4911 pres_respiration_sac = 1.0; | |
| 4912 | |
| 4913 // O2 pressure drop is measured via reading 2 | |
| 4914 char_I_SAC_mode = 2; | |
| 4915 | |
| 4916 // reconfigure max SAC rate to O2 consumption attention threshold | |
| 4917 max_sac_rate = O2_CONSUMPTION_LIMIT_ATTENTION; | |
| 4918 } | |
| 4919 | |
| 4920 | |
| 628 | 4921 // select which pressure reading to log |
| 4922 if( char_I_SAC_mode == 1 ) int_O_tank_pressure = int_IO_pressure_value[0]; | |
| 4923 else if( char_I_SAC_mode == 2 ) int_O_tank_pressure = int_IO_pressure_value[1]; | |
| 4924 else int_O_tank_pressure = 0; | |
| 4925 | |
| 4926 // strip flags | |
| 4927 int_O_tank_pressure &= 0x0FFF; | |
| 4928 | |
| 631 | 4929 // scale to recording format of full bar only |
| 628 | 4930 int_O_tank_pressure /= 10; |
| 4931 | |
| 4932 | |
| 623 | 4933 // calculate SAC - modes 1 & 2 |
| 4934 if( (char_I_SAC_mode == 1) || (char_I_SAC_mode == 2) ) | |
| 560 | 4935 { |
| 623 | 4936 overlay unsigned char reading_index; |
| 4937 overlay unsigned char reading_gas; | |
| 4938 overlay unsigned char reading_tanksize; | |
| 4939 overlay float reading_drop; | |
| 4940 | |
| 4941 // set index: char_I_SAC_mode = 1 -> reading one, index 0 | |
| 4942 // = 2 -> two, 1 | |
| 4943 reading_index = char_I_SAC_mode - 1; | |
| 4944 | |
| 4945 // get gas number (1-10) | |
| 4946 reading_gas = char_I_pressure_gas[reading_index]; | |
| 4947 | |
| 4948 // check if reading is configured and available | |
| 4949 if( reading_gas ) | |
| 4950 if( !(int_I_pressure_drop[reading_index] & INT_FLAG_NOT_AVAIL) ) | |
| 4951 { | |
| 4952 // get tank size (in liter) | |
| 4953 reading_tanksize = char_I_gas_avail_size[reading_gas-1]; | |
| 4954 | |
| 4955 // get pressure drop as float, stripping flags (in 1/5120 bar/sec) | |
| 4956 reading_drop = (float)(int_I_pressure_drop[reading_index] & 0x0FFF); | |
| 4957 | |
| 4958 // check if pressure drop is within range | |
| 4959 if( !(int_I_pressure_drop[reading_index] & INT_FLAG_OUT_OF_RANGE) ) | |
| 4960 { | |
| 4961 // calculate SAC, 10 is factor to have result in 0.1 liter/min | |
| 4962 // 60 is factor for 60 seconds per 1 minute, | |
| 4963 // 5120 accounts for reading_drop being in 1/5120 bar/sec | |
| 4964 // 10*60/5120 = 60/512 = 15/128 | |
| 4965 float_sac = reading_drop * 15/128 * reading_tanksize / pres_respiration_sac; | |
| 4966 | |
| 4967 // limit result to 999 (99.9 liter/min) | |
| 4968 if ( float_sac >= 998.5 ) | |
| 4969 { | |
| 4970 int_O_SAC_measured = 999 + INT_FLAG_ATTENTION; | |
| 4971 } | |
| 4972 else | |
| 4973 { | |
| 4974 // convert float to integer | |
| 4975 int_O_SAC_measured = (unsigned short)(float_sac + 0.5); | |
| 4976 | |
| 4977 // set attention flag if exceeding SAC threshold, but only if pressure drop is not outdated | |
| 4978 if( !(int_I_pressure_drop[reading_index] & INT_FLAG_OUTDATED) ) | |
| 4979 if( int_O_SAC_measured >= max_sac_rate ) | |
| 4980 { | |
| 4981 int_O_SAC_measured |= INT_FLAG_ATTENTION; | |
| 4982 } | |
| 4983 } | |
| 4984 } | |
| 4985 else | |
| 4986 { | |
| 4987 // pressure drop is out of range, so SAC will be set out of range, too | |
| 4988 int_O_SAC_measured = 999 + INT_FLAG_ATTENTION; | |
| 4989 } | |
| 4990 | |
| 4991 // copy outdated flag from int_I_pressure_drop to int_O_SAC_measured | |
| 4992 if( int_I_pressure_drop[reading_index] & INT_FLAG_OUTDATED ) | |
| 4993 { | |
| 4994 int_O_SAC_measured |= INT_FLAG_OUTDATED; | |
| 4995 } | |
| 4996 } | |
| 4997 } | |
| 4998 } | |
| 631 | 4999 #endif // _rx_functions |
| 5000 | |
| 5001 | |
| 5002 #ifdef _cave_mode | |
| 5003 | |
| 5004 ////////////////////////////////////////////////////////////////////////////// | |
| 5005 // read_backtrack_data | |
| 5006 // | |
| 5007 // Gets the data of the next backtracking data set | |
| 5008 // | |
| 5009 // Modified: backtrack_index last current position in backtracking storage | |
| 5010 // | |
| 5011 // Output: backtrack_step_counter number of 1/10 min calculation steps to do on next target depth | |
| 5012 // backtrack_target_depth next target depth | |
| 5013 // | |
| 5014 static void read_backtrack_data(void) | |
| 5015 { | |
| 5016 overlay unsigned char firstround = 1; | |
| 5017 | |
| 5018 | |
| 5019 // load the step counter with the default of ten 1/10 minute steps to go between two depth samples | |
| 5020 backtrack_step_counter = 10; | |
| 5021 | |
| 5022 // repeat until having read the whole data set or having reached the first storage position | |
| 5023 while(backtrack_index) | |
| 5024 { | |
| 5025 // backtracking data recording format: | |
| 5026 // --------------------------------------------------------------------------- | |
| 5027 // 0ddddddd -> datum is a depth recording with d = 0..127 depth in meters | |
| 5028 // 10tttttt -> delta time with t = 0.. 59 time in seconds | |
| 5029 // 110ggggg -> gas staging status with g = 1 gas staged | |
| 5030 // 111nnnnn -> waypoint marker with n = 1.. 31 waypoint number | |
| 5031 // | |
| 5032 // gas availability vector: LSB : gas 1 (and so on) | |
| 5033 // waypoint marker : 1 - 30: user waypoints, last waypoint is turn point | |
| 5034 // : 31: spare for turn point if all 30 waypoints used up | |
| 5035 // : 0: reserved | |
| 5036 | |
| 5037 // read recording entry and then advance (backward direction!) the reading index | |
| 5038 overlay unsigned char datum = char_I_backtrack_storage[backtrack_index--]; | |
| 5039 | |
| 5040 // is it a target depth? | |
| 5041 if( datum < 128 ) | |
| 5042 { | |
| 5043 // YES - assign the target depth | |
| 5044 backtrack_target_depth = datum; | |
| 5045 | |
| 5046 // a depth entry closes a data set, so done with this data set | |
| 5047 return; | |
| 5048 } | |
| 5049 | |
| 5050 // is it a delta time entry? | |
| 5051 else if( datum < 128 + 64 ) | |
| 5052 { | |
| 5053 // YES - When a delta time entry is contained in a data set, the time | |
| 5054 // stored in the delta time entry is the time that has elapsed | |
| 5055 // between storage of the depth that is part of this data set | |
| 5056 // and the previous depth recording. | |
| 5057 // This entry is stored whenever the delta time is shorter than | |
| 5058 // the default 1 minute depth sampling interval time. | |
| 5059 | |
| 5060 // assign the delta time to the step counter: remove entry tag and | |
| 5061 // convert datum from 0..59 seconds to 0..9 steps by integer division | |
| 5062 backtrack_step_counter = (datum - 128) / 6; | |
| 5063 } | |
| 5064 | |
| 5065 // is it a gas staging status entry? | |
| 5066 else if( datum < 128 + 64 + 32 ) | |
| 5067 { | |
| 5068 // YES - extract gas staging status | |
| 5069 overlay unsigned char gas_status = datum - (128 + 64); | |
| 5070 | |
| 5071 // decode and update gas staging status | |
| 5072 // | |
| 5073 // bit set : gas is staged (not available) during next section of backtracking, | |
| 5074 // bit cleared: gas is not staged ( available) during next section of backtracking. | |
| 5075 // | |
| 5076 // bit 0 corresponds to gas 1, ..., bit 4 corresponds to gas 5 | |
| 5077 // | |
| 5078 for( i = 0; i < NUM_GAS; i++ ) | |
| 5079 { | |
| 5080 if ( gas_status & (1 << i) ) deco_gas_type[i] |= GAS_AVAIL_STAGED; // staged | |
| 5081 else deco_gas_type[i] &= ~GAS_AVAIL_STAGED; // not staged | |
| 5082 } | |
| 5083 } | |
| 5084 | |
| 5085 // must be waypoint marker entry then | |
| 5086 else | |
| 5087 { | |
| 5088 // set step counter to zero if first entry read is a waypoint entry | |
| 5089 if( firstround ) backtrack_step_counter = 0; | |
| 5090 } | |
| 5091 | |
| 5092 // first round done | |
| 5093 firstround = 0; | |
| 5094 | |
| 5095 } // while | |
| 5096 | |
| 5097 // first storage position reached, by convention it contains | |
| 5098 // the final target depth which is zero meters aka the surface | |
| 5099 backtrack_target_depth = 0; | |
| 5100 } | |
| 5101 | |
| 5102 #endif // _cave_mode | |
| 5103 | |
| 623 | 5104 |
| 5105 | |
| 5106 ////////////////////////////////////////////////////////////////////////////// | |
| 631 | 5107 // convert_volume_to_pressure |
| 623 | 5108 // |
| 5109 // Converts gas volumes into pressures and sets respective flags | |
| 5110 // | |
| 5111 // Input: gas_needs_gas_index index of the gas to convert (0-4) | |
| 5112 // gas_volume_need[] needed gas volume in liters | |
| 5113 // char_I_gas_avail_pres[] available gas volume in bar | |
| 5114 // char_I_gas_avail_size[] size of the tanks in liters | |
| 5115 // char_I_pressure_gas[] gas configured on reading 1/2 (TR only) | |
| 5116 // | |
| 631 | 5117 // Output: int_O_gas_need_vol[] required gas amount in liters |
| 5118 // int_O_gas_need_pres[] required gas amount in bar, including flags | |
| 623 | 5119 // int_O_pressure_need[] required gas amount for reading 1/2 (TR only) |
| 5120 // | |
| 631 | 5121 static void convert_volume_to_pressure(void) |
| 623 | 5122 { |
| 5123 // just to make the code more readable... | |
| 5124 i = gas_needs_gas_index; | |
| 5125 | |
| 5126 if( gas_volume_need[i] >= 65534.5 ) | |
| 5127 { | |
| 5128 int_O_gas_need_vol[i] = 65535; // clip at 65535 liters | |
| 5129 int_O_gas_need_pres[i] = 999 | INT_FLAG_WARNING | INT_FLAG_HIGH; // 999 bar + warning flag + >999 flag | |
| 560 | 5130 } |
| 5131 else | |
| 5132 { | |
| 631 | 5133 // convert gas volume need from float to integer [in liter] |
| 5134 int_O_gas_need_vol[i] = (unsigned short)( gas_volume_need[i] + 0.5 ); | |
| 623 | 5135 |
| 5136 // compute how much pressure in the tank will be needed [in bar] | |
| 631 | 5137 int_O_gas_need_pres[i] = (unsigned short)( gas_volume_need[i] / char_I_gas_avail_size[i] + 0.5 ); |
| 623 | 5138 |
| 5139 // limit result to 999 bar because of display constraints | |
| 5140 if( int_O_gas_need_pres[i] > 999 ) int_O_gas_need_pres[i] = 999 | INT_FLAG_HIGH; | |
| 5141 | |
| 631 | 5142 // set flags for fast evaluation by output routine |
| 5143 if( int_O_gas_need_pres[i] == 0 ) int_O_gas_need_pres[i] |= INT_FLAG_ZERO; | |
| 5144 else | |
| 5145 #ifdef _gas_contingency | |
| 5146 if( main_status & GAS_CONTINGENCY ) | |
| 5147 { | |
| 5148 // take warning and attention computed en-route | |
| 5149 if ( deco_gas_type[i] & GAS_NEED_WARNING ) | |
| 5150 { | |
| 5151 // tag the tank with a warning | |
| 5152 int_O_gas_need_pres[i] |= INT_FLAG_WARNING; | |
| 5153 | |
| 5154 // tag the peer tanks with a warning, too | |
| 5155 for( j = 0; j < NUM_GAS; j++ ) | |
| 5156 { | |
| 5157 if( peer_tank[i] & (1 << j) ) int_O_gas_need_pres[j] |= INT_FLAG_WARNING; | |
| 5158 } | |
| 5159 } | |
| 5160 else if( deco_gas_type[i] & GAS_NEED_ATTENTION ) | |
| 5161 { | |
| 5162 // tag the tank with an attention | |
| 5163 int_O_gas_need_pres[i] |= INT_FLAG_ATTENTION; | |
| 5164 | |
| 5165 // tag the peer tanks with an attention, too | |
| 5166 for( j = 0; j < NUM_GAS; j++ ) | |
| 5167 { | |
| 5168 if( peer_tank[i] & (1 << j) ) int_O_gas_need_pres[j] |= INT_FLAG_ATTENTION; | |
| 5169 } | |
| 5170 } | |
| 5171 } | |
| 5172 else | |
| 5173 #endif | |
| 5174 { | |
| 5175 // compute warning and attention now | |
| 5176 if ( gas_volume_need[i] >= gas_volume_avail[i] ) int_O_gas_need_pres[i] |= INT_FLAG_WARNING; | |
| 5177 else if( gas_volume_need[i] >= gas_volume_atten[i] ) int_O_gas_need_pres[i] |= INT_FLAG_ATTENTION; | |
| 5178 } | |
| 560 | 5179 } |
| 5180 | |
| 631 | 5181 // set invalid flag if there is an overflow in the stops table or calculation took too long |
| 628 | 5182 if( deco_warnings & DECO_WARNING_INCOMPLETE ) int_O_gas_need_pres[i] |= INT_FLAG_INVALID; |
| 560 | 5183 |
| 604 | 5184 #ifdef _rx_functions |
| 5185 // only for OSTC TR model with TR functions enabled | |
| 623 | 5186 if( main_status & TR_FUNCTIONS ) |
| 560 | 5187 { |
| 623 | 5188 // char_I_pressure_gas[] uses gas indexes from 1-10, loop variable i runs from 0 to 4 |
| 631 | 5189 j = i+1; |
| 623 | 5190 |
| 5191 // check if the current gas is configured on pressure reading 1 or 2 | |
| 5192 if( (char_I_pressure_gas[0] == j) || (char_I_pressure_gas[1] == j) ) | |
| 560 | 5193 { |
| 623 | 5194 // get a copy of the required pressure in full bar |
| 5195 overlay unsigned short int_pres_need = int_O_gas_need_pres[i]; | |
| 5196 | |
| 5197 // strip all flags | |
| 5198 int_pres_need &= 1023; | |
| 5199 | |
| 5200 // limit to 400 bar and multiply by 10 to get required pressure in 0.1 bar | |
| 5201 int_pres_need = (int_pres_need > 400) ? 4000 | INT_FLAG_OUT_OF_RANGE : 10 * int_pres_need; | |
| 5202 | |
| 631 | 5203 // tag as not available if there is an overflow in the stops table or calculation took too long |
| 628 | 5204 if( deco_warnings & DECO_WARNING_INCOMPLETE ) int_pres_need |= INT_FLAG_NOT_AVAIL; |
| 623 | 5205 |
| 5206 // copy to reading data (in both readings the same gas could be configured) | |
| 5207 if( char_I_pressure_gas[0] == j ) int_O_pressure_need[0] = int_pres_need; | |
| 5208 if( char_I_pressure_gas[1] == j ) int_O_pressure_need[1] = int_pres_need; | |
| 5209 } | |
| 5210 } // TR functions | |
| 604 | 5211 #endif |
| 0 | 5212 } |
| 5213 | |
| 623 | 5214 |
| 5215 ////////////////////////////////////////////////////////////////////////////// | |
| 5216 // convert the real CNS value to integer | |
| 5217 // | |
| 5218 // Input CNS_fraction_real current CNS value as float | |
| 5219 // | |
| 5220 // Output: int_O_CNS_current current CNS value as integer including flags | |
| 5221 // | |
| 5222 static void convert_cur_CNS_for_display(void) | |
| 5223 { | |
| 5224 // convert to integer | |
| 5225 float_value = CNS_fraction_real; convert_float_to_int(); int_O_CNS_current = int_value; | |
| 5226 | |
| 5227 // set warning & attention flags | |
| 628 | 5228 if ( int_O_CNS_current >= CNS_LIMIT_WARNING ) int_O_CNS_current |= INT_FLAG_WARNING; |
| 5229 else if ( int_O_CNS_current >= CNS_LIMIT_ATTENTION ) int_O_CNS_current |= INT_FLAG_ATTENTION; | |
| 623 | 5230 } |
| 5231 | |
| 5232 | |
| 0 | 5233 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 5234 // convert the simulated CNS value to integer |
| 5235 // | |
| 5236 // Input: CNS_fraction_sim CNS value after predicted ascent in float | |
| 5237 // | |
| 5238 // Output: int_sim_CNS_fraction CNS value after predicted ascent in integer | |
| 5239 // including flags, will be routed to | |
| 5240 // int_O_{normal,alternative}_CNS_fraction | |
| 5241 // | |
| 604 | 5242 static void convert_sim_CNS_for_display(void) |
| 582 | 5243 { |
| 623 | 5244 // convert to integer |
| 5245 float_value = CNS_fraction_sim; convert_float_to_int(); int_sim_CNS_fraction = int_value; | |
| 5246 | |
| 5247 // set warning & attention flags | |
| 628 | 5248 if ( int_sim_CNS_fraction >= CNS_LIMIT_WARNING ) int_sim_CNS_fraction |= INT_FLAG_WARNING; |
| 5249 else if ( int_sim_CNS_fraction >= CNS_LIMIT_ATTENTION ) int_sim_CNS_fraction |= INT_FLAG_ATTENTION; | |
| 604 | 5250 |
| 631 | 5251 // set invalid flag if there is an overflow in the stops table or calculation took too long |
| 628 | 5252 if ( deco_warnings & DECO_WARNING_INCOMPLETE ) int_sim_CNS_fraction |= INT_FLAG_INVALID; |
| 604 | 5253 } |
| 5254 | |
| 623 | 5255 |
| 604 | 5256 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 5257 // convert the saturation value of the leading tissue to integer |
| 5258 // | |
| 5259 // Input lead_supersat saturation of the leading tissue | |
| 5260 // lead_tissue number of the leading tissue | |
| 5261 // char_I_GF_High_percentage GF high factor | |
| 5262 // | |
| 5263 // Output: int_O_lead_supersat saturation of the leading tissue | |
| 5264 // char_O_lead_tissue number of the leading tissue | |
| 5265 // | |
| 5266 // Modified: deco_warnings deco engine warnings vector | |
| 5267 // | |
| 5268 static void convert_sat_for_display(void) | |
| 604 | 5269 { |
| 623 | 5270 // convert supersaturation of the leading tissue to int_O_lead_supersat in % (1.0 = 100%) |
| 604 | 5271 // limit to 255 because of constraints in ghostwriter code |
| 623 | 5272 if ( lead_supersat <= 0.000 ) int_O_lead_supersat = 0; |
| 5273 else if ( lead_supersat > 2.545 ) int_O_lead_supersat = 255; | |
| 5274 else int_O_lead_supersat = (unsigned short)(100 * lead_supersat + 0.5); | |
| 5275 | |
| 5276 // set warning & attention flags | |
| 5277 if( int_O_lead_supersat > 100 ) | |
| 604 | 5278 { |
| 623 | 5279 int_O_lead_supersat |= INT_FLAG_WARNING; // make GF factor shown in red |
| 5280 deco_warnings |= DECO_WARNING_OUTSIDE; // make depth shown in red | |
| 5281 } | |
| 631 | 5282 else if( (char_I_model != 0) && (int_O_lead_supersat > char_I_GF_High_percentage) |
| 5283 || (char_I_model == 0) && (int_O_lead_supersat > 99 ) ) | |
| 623 | 5284 { |
| 5285 int_O_lead_supersat |= INT_FLAG_ATTENTION; // make GF factor shown in yellow | |
| 5286 deco_warnings |= DECO_ATTENTION_OUTSIDE; // make depth shown in yellow | |
| 604 | 5287 } |
| 5288 | |
| 5289 // export also the number of the leading tissue | |
| 623 | 5290 char_O_lead_tissue = lead_tissue; |
| 604 | 5291 } |
| 5292 | |
| 623 | 5293 |
| 604 | 5294 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 5295 // convert the ceiling value to integer |
| 5296 // | |
| 5297 // Input: ceiling minimum depth permitted in float | |
| 5298 // | |
| 628 | 5299 // Output: int_O_ceiling minimum depth permitted in mbar (cm) |
| 623 | 5300 // |
| 5301 // Modified: deco_info deco engine information vector | |
| 5302 // | |
| 604 | 5303 static void convert_ceiling_for_display(void) |
| 5304 { | |
| 5305 // Convert ceiling to int_O_ceiling in mbar relative pressure. | |
| 5306 // Round up to next 10 cm so that the ceiling disappears only | |
| 5307 // when the ceiling limit is really zero. This will coincident | |
| 5308 // with TTS switching back to NDL time. | |
| 628 | 5309 // The +1.5 term figures in the conversion factor of 10.015 m/bar |
| 5310 // which is used inside the deco engine but not outside of it. | |
| 623 | 5311 if ( ceiling <= 0.0 ) int_O_ceiling = 0; |
| 5312 else if ( ceiling > 16.0 ) int_O_ceiling = 16000; | |
| 628 | 5313 else int_O_ceiling = (unsigned short)(ceiling * (1000+1.5) + 9); |
| 604 | 5314 |
| 5315 // set/reset ceiling flag | |
| 623 | 5316 if ( int_O_ceiling ) deco_info |= DECO_CEILING; |
| 5317 else deco_info &= ~DECO_CEILING; | |
| 0 | 5318 } |
| 5319 | |
| 623 | 5320 |
| 0 | 5321 ////////////////////////////////////////////////////////////////////////////// |
| 582 | 5322 // push_tissues_to_vault & pull_tissues_from_vault |
| 5323 // | |
| 5324 // ATTENTION: Do not use from inside the deco engine! | |
| 5325 // The vault is exclusively reserved to back-up and restore the real | |
| 5326 // tissues and related data when entering / leaving simulation mode! | |
| 5327 // | |
| 623 | 5328 // Input/Output: CNS_fraction_real current real CNS value |
| 5329 // char_O_deco_warnings deco engine warnings vector | |
| 5330 // real_pres_tissue_N2[] partial pressure of N2 in real tissues | |
| 5331 // real_pres_tissue_He[] partial pressure of He in real tissues | |
| 5332 // | |
| 5333 // Output: int_O_CNS_current current CNS value as integer including flags | |
| 5334 // | |
| 604 | 5335 static void push_tissues_to_vault(void) |
| 0 | 5336 { |
| 623 | 5337 // store the current CNS value and deco warnings |
| 5338 vault_CNS_fraction_real = CNS_fraction_real; | |
| 5339 vault_deco_warnings = char_O_deco_warnings; | |
| 5340 vault_deco_info = char_O_deco_info; | |
| 5341 | |
| 5342 // store the tissue pressures | |
| 5343 for( i = 0; i < NUM_COMP; i++ ) | |
| 582 | 5344 { |
| 623 | 5345 vault_pres_tissue_N2[i] = real_pres_tissue_N2[i]; |
| 5346 #ifdef _helium | |
| 5347 vault_pres_tissue_He[i] = real_pres_tissue_He[i]; | |
| 5348 #else | |
| 5349 vault_pres_tissue_He[i] = 0; | |
| 5350 #endif | |
| 582 | 5351 } |
| 0 | 5352 } |
| 5353 | |
| 604 | 5354 static void pull_tissues_from_vault(void) |
| 0 | 5355 { |
| 623 | 5356 // restore the CNS value and deco warnings |
| 5357 CNS_fraction_real = vault_CNS_fraction_real; | |
| 5358 char_O_deco_warnings = vault_deco_warnings; | |
| 5359 char_O_deco_info = vault_deco_info; | |
| 5360 | |
| 5361 // convert the CNS value to integer | |
| 5362 convert_cur_CNS_for_display(); | |
| 5363 | |
| 5364 // restore the tissue pressures | |
| 5365 for( i = 0; i < NUM_COMP; i++ ) | |
| 582 | 5366 { |
| 623 | 5367 real_pres_tissue_N2[i] = vault_pres_tissue_N2[i]; |
| 5368 #ifdef _helium | |
| 5369 real_pres_tissue_He[i] = vault_pres_tissue_He[i]; | |
| 5370 #else | |
| 5371 real_pres_tissue_He[i] = 0; | |
| 5372 #endif | |
| 582 | 5373 } |
| 0 | 5374 } |
| 5375 | |
| 623 | 5376 |
| 0 | 5377 ////////////////////////////////////////////////////////////////////////////// |
| 5378 // | |
| 5379 #ifndef CROSS_COMPILE | |
| 5380 void main() {} | |
| 5381 #endif |