Mercurial > public > hwos_code
annotate src/p2_deco.c @ 629:237931377539
3.07 stable release
| author | heinrichsweikamp |
|---|---|
| date | Fri, 29 Nov 2019 18:48:11 +0100 |
| parents | cd58f7fc86db |
| children | 185ba2f91f59 |
| rev | line source |
|---|---|
| 582 | 1 // *************************************************************************** |
| 629 | 2 // p2_deco.c combined next generation V3.06.1 |
| 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 | |
| 38 // 10/14/2008 v104: integration of char_I_depth_last_deco for Gradient Model | |
| 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. | |
| 623 | 50 // 2011/04/15: [jDG] Store GF_low_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). |
| 62 // 2013/03/05: [jDG] Should vault GF_low_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 | |
| 604 | 126 #define ppWater 0.06270 // water vapor partial pressure in the lungs |
| 582 | 127 #define METER_TO_BAR 0.09985 // conversion factor |
| 128 #define BAR_TO_METER 10.0150 // conversion factor (1.0/METER_TO_BAR) | |
| 604 | 129 #define SURFACE_DESAT_FACTOR 0.70420 // surface desaturation safety factor |
| 560 | 130 #define HYST 1.0E-06 // threshold for tissue graphics on-gassing / off-gassing visualization |
| 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 | |
| 628 | 137 #define GAS_NEEDS_LIMIT_ATTENTION 0.70 // threshold for gas needs attention [1.00 = 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 |
| 628 | 141 #define STOP_CHAINING_LIMIT 5 // max. number of chained stop table entries before deco calculation is aborted |
| 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 | |
| 147 #define CAVE_MODE 0x04 // =1: calculate ascent and gas needs using backtracking data | |
| 148 #define USE_Z_FACTOR 0x08 // =1: calculate with Z factor when converting gas volumes <-> pressures | |
| 149 | |
| 150 #define TR_FUNCTIONS 0x10 // =1: calculate TR functions (pressure reading) processing | |
| 151 #define EXTENDED_STOPS 0x20 // =1: allow placement of gas switches below the depth of the 1st stop | |
| 152 | |
| 153 #define MODE_MASK 0xC0 // mask for real tissues mode selection | |
| 154 #define MODE_LOOP 0x40 // =1: CCR (MODE_PSCR needs to be cleared) or pSCR mode | |
| 155 #define MODE_CCR 0x40 // to be used with == operator in combination with MODE_MASK only! | |
| 156 #define MODE_PSCR 0x80 // =1: pSCR mode (MODE_LOOP needs to be set, too) | |
| 157 | |
| 158 // deco engine states and modes - (char_O_)deco_status: controls deco plan calculation (to-be scenario) | |
| 159 #define PLAN_MASK 0x03 // bit mask covering normal & alternative plan flag | |
| 160 #define COMMAND_MASK 0x07 // bit mask covering all command flags | |
| 161 #define CALCULATING 0x00 // calculations are ongoing | |
| 162 #define START_NORM 0x01 // input: start calculation of a normal deco plan | |
| 163 #define CALC_NORM 0x01 // internal: calculating a normal deco plan | |
| 164 #define COMPLETED_NORM 0x01 // output: calculation of a normal deco plan has completed | |
| 165 #define START_ALT 0x02 // input: start calculation of an alternative deco plan | |
| 166 #define CALC_ALT 0x02 // internal: calculating an alternative deco plan | |
| 167 #define COMPLETED_ALT 0x02 // output: calculation of an alternative deco plan has completed | |
| 168 #define INITIALIZE 0x04 // input: initialize deco engine | |
| 169 #define INITIALIZE_START_NORM 0x05 // input: initialize deco engine and start calculation of a normal deco plan | |
| 170 #define INITIALIZE_START_ALT 0x06 // input: initialize deco engine and start calculation of an alternative deco plan | |
| 628 | 171 #define DECO_CALCULATOR_MODE 0x08 // input: deco engine is run from deco calculator |
| 623 | 172 |
| 173 #define BAILOUT_MODE 0x10 // =1: allow gas switches before first deco stop | |
| 174 #define DELAYED_ASCENT 0x20 // =1: figure in a delayed ascent (fTTS) | |
| 175 | |
| 176 // MODE_MASK 0xC0 // mask for simulated tissues mode selection | |
| 177 // MODE_LOOP 0x40 // =1: CCR (MODE_PSCR needs to be cleared) or pSCR mode | |
| 178 // MODE_CCR 0x40 // to be used with == operator in combination with MODE_MASK only! | |
| 179 // MODE_PSCR 0x80 // =1: pSCR mode (MODE_LOOP needs to be set, too) | |
| 180 | |
| 181 | |
| 182 // deco engine warnings - (char_O_)deco_warnings | |
| 604 | 183 #define DECO_WARNING_IBCD 0x01 // IBCD occurring now |
| 184 #define DECO_WARNING_IBCD_lock 0x02 // IBCD has occurred during the dive | |
| 185 #define DECO_WARNING_MBUBBLES 0x04 // micro bubbles likely to develop now | |
| 186 #define DECO_WARNING_MBUBBLES_lock 0x08 // ditto, but sometime during the dive | |
| 187 #define DECO_WARNING_OUTSIDE 0x10 // tissue pressures outside the Buhlmann model now | |
| 188 #define DECO_WARNING_OUTSIDE_lock 0x20 // tissue pressures outside the model sometime during the dive | |
| 189 #define DECO_ATTENTION_OUTSIDE 0x40 // tissue pressures are very close to the Buhlmann limit | |
| 628 | 190 #define DECO_WARNING_INCOMPLETE 0x80 // internal error: deco calculation incomplete |
| 604 | 191 |
| 623 | 192 // deco engine status (char_O_)deco_info |
| 628 | 193 #define DECO_MODE 0x01 // =1: deco ppO2 levels are permitted |
| 604 | 194 #define IND_DOUBLE_SWITCH_FLAG 0x02 // =1: switch to other tank advice active |
| 623 | 195 // 0x04 // --- unused |
| 196 #define DECO_ZONE 0x08 // =1: fTTS < TTS (not updated when in bailout mode) | |
| 604 | 197 #define DECO_CEILING 0x10 // =1: ceiling depth > 0 |
| 623 | 198 #define DECO_STOPS 0x20 // =1: deco stops found |
| 199 #define GAS_NEEDS_CAVE 0x40 // =1: indicated gas needs are calculated in cave mode | |
| 200 // 0x80 // --- unused | |
| 201 | |
| 604 | 202 |
| 203 // deco engine control - tissue_increment | |
| 623 | 204 #define TIME_MASK 0x7F // =0: time increment is 2 seconds, 1..127: time increments is 1..127 minutes |
| 205 #define TISSUE_SELECTOR 0x80 // =1: calculate on real tissues, =0: calculate on simulated tissues | |
| 206 | |
| 207 | |
| 208 // deco engine control - next_planning_phase | |
| 209 #define PHASE_00_DONE 0x00 // calculation cycle finished | |
| 210 #define PHASE_10_DIVE_INIT 0x10 // once-per-dive initialization of the deco engine | |
| 628 | 211 #define PHASE_20_CYCLIC_INIT 0x20 // once-every-cycle initialization of the deco engine |
| 212 #define PHASE_30_EXTENDED_BOTTOM_TIME 0x30 // calculate extended bottom time | |
| 213 #define PHASE_40_BOTTOM_GAS_NEED 0x40 // calculate gas needs for bottom segment | |
| 214 #define PHASE_50_NDL_TIME 0x50 // calculate NDL time | |
| 215 #define PHASE_60_CAVE_RETURN 0x60 // calculate cave mode return | |
| 216 #define PHASE_70_OPEN_WATER_ASCENT 0x70 // calculate open water ascent | |
| 217 #define PHASE_80_RESULTS 0x80 // results - initialization | |
| 218 #define PHASE_81_RESULTS_STOPS_TABLE 0x81 // results - publish stops table | |
| 219 #define PHASE_82_RESULTS_NDL 0x82 // results - publish data / within NDL | |
| 220 #define PHASE_83_RESULTS_DECO 0x83 // results - publish data / in deco | |
| 221 #define PHASE_84_GAS_NEEDS_PRESSURES 0x84 // results - convert gas needs from volumes to pressures | |
| 623 | 222 #define PHASE_90_FINISH 0x90 // finish calculation cycle |
| 223 | |
| 224 | |
| 560 | 225 // flags used with integer numbers |
| 604 | 226 #define INT_FLAG_INVALID 0x0400 // =1: value not valid |
| 623 | 227 #define INT_FLAG_NOT_COMPUTED_YET 0x0800 // =1: value not computed yet |
| 604 | 228 #define INT_FLAG_ZERO 0x0800 // =1: value is zero |
| 229 #define INT_FLAG_LOW 0x1000 // =1: value is below a lower warning threshold | |
| 230 #define INT_FLAG_NOT_AVAIL 0x1000 // =1: value is not available (not computed) | |
| 231 #define INT_FLAG_HIGH 0x2000 // =1: value is above an upper warning threshold | |
| 232 #define INT_FLAG_OUTDATED 0x2000 // =1: value has not been updated for too long | |
| 233 #define INT_FLAG_ATTENTION 0x4000 // =1: value exceeds the attention threshold | |
| 234 #define INT_FLAG_WARNING 0x8000 // =1: value exceeds the warning threshold | |
| 235 #define INT_FLAG_OUT_OF_RANGE 0x8000 // =1: value exceeds presentable range | |
| 236 | |
| 237 | |
| 238 | |
| 239 // ********************************************************************************************************************************* | |
| 240 // | |
| 241 // ** P R O T O T Y P E S ** | |
| 242 // | |
| 243 // The Functions are listed in sequence of intended usage / application. | |
| 244 // | |
| 245 // ********************************************************************************************************************************* | |
| 246 | |
| 623 | 247 // Functions used in Surface Mode |
| 604 | 248 static void calc_interval(PARAMETER unsigned char time_increment); |
| 249 // Calculates the tissue off-gassing under surface conditions. | |
| 250 static void calc_desaturation_time(void); // Calculates the desaturation and no-fly times. | |
| 251 static void clear_tissue(void); // Resets all tissues to surface pressure equilibrium state. | |
| 623 | 252 static void init_output_vars(void); // Initializes all deco engine output variables to defaults |
| 253 | |
| 254 // Main entry point in Dive Mode | |
| 604 | 255 static void calc_hauptroutine(void); // Sequences all calculations for the real tissues and the deco calculation. |
| 256 | |
| 623 | 257 // Functions dedicated to the real Tissues |
| 604 | 258 static void calc_hauptroutine_data_input(void);// Initializes environment data and sets gas ratios for the real tissues. |
| 259 | |
| 623 | 260 // Functions combined for real Tissues & Deco Calculations |
| 604 | 261 static void calc_alveolar_pressures(void); // Computes the partial pressures from the gas ratios and many more parameters, |
| 262 // needs either calc_hauptroutine_data_input() be called beforehand or | |
| 628 | 263 // gas_take_current() or gas_find_best()/gas_take_best() and gas_set_ratios(). |
| 604 | 264 static void calc_tissues(void); // Updates the tissues dependent on the partial pressures of N2 and He. |
| 265 static void calc_CNS(void); // Updates the CNS value dependent on the partial pressure of the O2. | |
| 266 static void calc_limit(PARAMETER float GF_current); | |
| 267 // Calculates ceiling, current GF (supersaturation) and some more data. | |
| 268 | |
| 623 | 269 // Functions for TR |
| 270 #ifdef _rx_functions | |
| 271 static void calc_TR_functions(void); // Calculates SAC etc. | |
| 272 #endif | |
| 273 | |
| 274 // Functions dedicated to Deco Calculations | |
| 604 | 275 static void clear_deco_table(void); // Clears the deco stops table, invoked at the start of each calculation cycle. |
| 628 | 276 static void gas_take_current(void); // Sets the first gas used for deco calculation, invoked at start of cycle, too. |
| 277 static unsigned char gas_find_best(void); // Searches for the best gas available. | |
| 278 static void gas_take_best(void); // Switches to the best gas that has been found found before by gas_find_best(). | |
| 604 | 279 static void gas_set_ratios(void); // Sets the gas ratios for use in deco calculation (simulated tissues), |
| 628 | 280 // needs to be called after each gas change (gas_take_current/_better). |
| 623 | 281 static void calc_NDL_time_tissue(void); // Calculates the remaining NDL time for a given tissue. |
| 282 static unsigned char find_next_stop(void); // Finds the next stop when in a deco ascent. | |
| 560 | 283 static unsigned char update_deco_table(PARAMETER unsigned char time_increment); |
| 604 | 284 // Enters a new stop or extends an existing stop in the deco stops table. |
| 623 | 285 static void calc_due_by_depth_time_sac(void); // Calculates gas volume required for a given depth, time and usage (SAC rate). |
| 286 static void convert_gas_needs_to_press(void); // Converts gas volumes into pressures and sets respective flags. | |
| 287 | |
| 288 // Functions for Results Reporting | |
| 604 | 289 static void publish_deco_table(void); // Copies the internal deco stops table to the export interface. |
| 623 | 290 static void convert_cur_CNS_for_display(void); // Converts the current CNS value from float to integer. |
| 604 | 291 static void convert_sim_CNS_for_display(void); // Converts the end-of-dive CNS value from float to integer. |
| 623 | 292 static void convert_sat_for_display(void); // Converts leading tissue saturation value from float to integer, 1.0 = 100%. |
| 604 | 293 static void convert_ceiling_for_display(void); // Converts ceiling from float to integer in mbar relative pressure. |
| 294 | |
| 295 | |
| 623 | 296 // internal helper Functions |
| 297 static void load_tmr5(void); // Loads a hardware timer which is used for preemptive scheduling. | |
| 298 static void read_tmr5(void); // Reads a hardware timer which is used for preemptive scheduling. | |
| 299 static void read_CNS_ab_coefficient(void); // Reads the CNS a and b coefficients from a ROM table. | |
| 300 static void read_CNS_c_coefficient(void); // Reads the CNS c coefficient from a ROM table. | |
| 301 static void read_Buhlmann_coefficients(void); // Reads the Buhlmann a and b coefficients from a ROM table. | |
| 604 | 302 static void read_Buhlmann_times(PARAMETER char period); |
| 303 // Reads pre-computed tissue increment factors from a ROM table. | |
| 304 static void read_Buhlmann_ht(void); // Reads the half-times from a ROM table. | |
| 305 static void adopt_Buhlmann_coefficients(void); // Computes average a and b coefficient by the N2/He tissue ratio. | |
| 306 static void push_tissues_to_vault(void); // Stores the state of the real tissues during simulator runs. | |
| 307 static void pull_tissues_from_vault(void); // Restores the state of the real tissues after a simulator run. | |
| 628 | 308 static void calc_sim_pres_respiration(void); // Calculate sim_pres_respiration from char_depth_sim. |
| 309 static void calc_N2_equilibrium(void); // Calculate partial pressure of N2 in respired air at surface pressure. | |
| 310 static void get_saturation_factors(void); // Get, safeguard and convert the saturation and desaturation factors. | |
| 311 static void apply_saturation_factors(void); // Applies saturation and desaturation factors. | |
| 604 | 312 |
| 313 | |
| 314 // ********************************************************************************************************************************* | |
| 315 // | |
| 316 // V A R I A B L E S D E F I N I T I O N S | |
| 317 // | |
| 318 // ********************************************************************************************************************************* | |
| 0 | 319 |
| 320 //---- Bank 5 parameters ----------------------------------------------------- | |
| 321 #ifndef UNIX | |
| 322 # pragma udata bank5=0x500 | |
| 323 #endif | |
| 324 | |
| 623 | 325 // Environmental and Gas Data (52 byte) |
| 560 | 326 |
| 582 | 327 static float pres_surface; // absolute pressure at the surface |
| 560 | 328 |
| 628 | 329 static float float_depth_real; // current real depth in meters, float |
| 330 static unsigned char char_depth_real; // current real depth in meters, integer | |
| 331 static unsigned char char_depth_sim_start; // start value of simulated depth in meters, integer | |
| 332 static unsigned char char_depth_sim; // current value of simulated depth in meters, integer | |
| 333 static unsigned char char_depth_last; // last value of simulated depth in meters, integer | |
| 604 | 334 |
| 335 static float real_pres_respiration; // current real depth in absolute pressure | |
| 336 static float real_O2_ratio; // real breathed gas oxygen ratio | |
| 337 static float real_N2_ratio; // real breathed gas nitrogen ratio | |
| 338 static float real_He_ratio; // real breathed gas helium ratio | |
| 339 static float real_pSCR_drop; // real ppO2 drop in pSCR loop | |
| 582 | 340 |
| 341 static float sim_pres_respiration; // simulated current depth in abs.pressure, used for deco calculations | |
| 342 static float sim_O2_ratio; // simulated breathed gas oxygen ratio | |
| 343 static float sim_N2_ratio; // simulated breathed gas nitrogen ratio | |
| 344 static float sim_He_ratio; // simulated breathed gas helium ratio | |
| 345 static float sim_pSCR_drop; // simulated ppO2 drop in pSCR loop | |
| 560 | 346 |
| 604 | 347 |
| 623 | 348 // general Deco Parameters (57 byte) |
| 349 | |
| 350 static float GF_low; // gradient factor to determine 1st stop | |
| 351 static float GF_high; // gradient factor to determine surfacing | |
| 352 | |
| 353 static unsigned char GF_low_last; // last GF low, used to detect changes | |
| 354 static unsigned char GF_high_last; // last GF high, used to detect changes | |
| 355 | |
| 356 static unsigned char GF_low_depth; // GF low reference depth in current calculation cycle | |
| 357 static unsigned char GF_low_depth_norm; // GF low reference depth in normal plan | |
| 358 static unsigned char GF_low_depth_alt; // GF low reference depth in alternative plan | |
| 359 | |
| 360 static float GF_slope; // (GF_high - GF_low) / GF_low_depth in current calculation cycle | |
| 361 static float GF_slope_norm; // (GF_high - GF_low) / GF_low_depth_norm in normal plan | |
| 362 static float GF_slope_alt; // (GF_high - GF_low) / GF_low_depth_alt in alternative plan | |
| 363 | |
| 364 static float float_ascent_speed; // ascent speed from options_table (5.0 .. 10.0 m/min) | |
| 628 | 365 static float float_deco_distance; // additional depth below stop depth - not used any more |
| 623 | 366 static float float_saturation_multiplier; // safety factor for on-gassing rates |
| 367 static float float_desaturation_multiplier; // safety factor for off-gassing rates | |
| 368 | |
| 369 static unsigned char split_N2_He[NUM_COMP]; // used for calculating the desaturation time | |
| 370 | |
| 371 | |
| 372 // real Context: what we are doing now (16 byte) | |
| 373 | |
| 374 static float CNS_fraction_real; // current real CNS (1.00 = 100%) | |
| 375 static unsigned short IBCD_tissue_vector; // 16 bit vector to memorize all tissues that experience IBCD | |
| 376 | |
| 377 static float pres_respiration_sac; // used in SAC calculation: current depth in absolute pressure | |
| 378 static float float_sac; // used in SAC calculation: SAC value in float | |
| 379 static unsigned short max_sac_rate; // used in SAC calculation: threshold for SAC rate attention | |
| 380 | |
| 381 | |
| 382 // simulated Context: used to calculate Ascent (11 byte) | |
| 383 | |
| 384 static float CNS_fraction_sim; // CNS after predicted ascent, 0.01 = 1%, as float | |
| 385 static unsigned short int_sim_CNS_fraction; // CNS after predicted ascent, 1 = 1%, as integer | |
| 386 static unsigned char NDL_tissue_start_norm; // tissue to start with when calculating the normal NDL time | |
| 387 static unsigned char NDL_tissue_start_alt; // tissue to start with when calculating the alternative NDL time | |
| 388 static unsigned char NDL_tissue_start; // tissue to start with in current cycle | |
| 389 static unsigned char NDL_tissue_lead; // tissue with the shortest NDL time found in current cycle | |
| 390 static unsigned char NDL_tissue; // tissue for which the NDL is calculated right now | |
| 391 | |
| 628 | 392 |
| 623 | 393 // Result Values from Calculation Functions (9 byte) |
| 394 | |
| 395 static float ceiling; // minimum tolerated relative pressure (i.e. without surface pressure) | |
| 396 static float lead_supersat; // supersaturation of the leading tissue, 1.0 = 100% | |
| 397 static unsigned char lead_tissue; // number of the leading tissue | |
| 398 | |
| 399 | |
| 400 // Transfer Variables between calc_desaturation_time() and calc_desaturation_time_helper() (18 byte) | |
| 401 | |
| 402 static float desat_factor; // used to cache a pre-computed factor | |
| 403 static float var_ht; // buffer for a half-time factor | |
| 404 static float pres_target; // target pressure for a compartment | |
| 405 static float pres_actual; // current pressure of the compartment | |
| 406 static unsigned short int_time; // time it takes for the compartment to reach the target pressure | |
| 407 | |
| 408 | |
| 628 | 409 // Gas in Use and Gas Needs (26 byte) |
| 410 | |
| 411 static unsigned char sim_gas_last_num; // number of the last used gas | |
| 623 | 412 static unsigned char sim_gas_current_num; // number of the currently used gas |
| 413 static unsigned char sim_gas_current_depth; // change depth of the currently used gas | |
| 414 | |
| 628 | 415 static unsigned char sim_gas_best_num; // number of the better gas |
| 416 static unsigned char sim_gas_best_depth; // change depth of the better gas | |
| 417 | |
| 623 | 418 static unsigned char gas_needs_gas_index; // index to the gas and tank data arrays |
| 628 | 419 static float gas_volume_need[NUM_GAS]; // gas volumes required for return/ascent in liters |
| 420 static float gas_volume_avail[NUM_GAS]; // gas volumes available for return/ascent in liters | |
| 421 | |
| 422 | |
| 423 // Transfer Variables for calc_due_by_depth_time_sac() (7 byte) | |
| 424 | |
| 425 static unsigned char gas_needs_depth; // depth of the stop or half-way point | |
| 426 static unsigned char gas_needs_time; // duration of the stop or ascent phase | |
| 427 static unsigned char gas_needs_usage_rate; // gas usage in l/min | |
| 623 | 428 static float gas_needs_volume_due; // computed due of gas volume required |
| 429 | |
| 430 | |
| 431 // Auxiliary Variables for Data Buffering (28 byte) | |
| 432 | |
| 433 static float N2_equilibrium; // used for N2 tissue graphics scaling | |
| 434 static float temp_tissue; // auxiliary variable to buffer tissue pressures | |
| 435 static float float_pSCR_factor; // pre-computed factor for pSCR ppO2 drop calculation | |
| 436 static float calc_pres_tissue_N2; // auxiliary variable to buffer tissue N2 pressure | |
| 437 static float calc_pres_tissue_He; // auxiliary variable to buffer tissue He pressure | |
| 438 static float pres_tissue; // auxiliary variable to buffer total tissue pressure | |
| 439 static float old_pres_respiration; // auxiliary variable to buffer sim_pres_respiration | |
| 440 | |
| 441 | |
| 628 | 442 // 244 byte used, 12 byte left in this bank (4 bytes per float, 2 bytes per short, 1 byte per char) |
| 623 | 443 |
| 444 | |
| 445 //---- Bank 6 parameters ----------------------------------------------------- | |
| 446 #ifndef UNIX | |
| 447 # pragma udata bank6=0x600 | |
| 448 #endif | |
| 449 | |
| 450 // Timer5 Interface (3 byte) - Attention: keep order and keep at beginning of bank 6, i.e. at address 0x600 ! | |
| 451 | |
| 452 static volatile unsigned short tmr5_value; // timer 5 value buffer MUST be at address 0x600 | |
| 453 static volatile unsigned char tmr5_overflow; // timer 5 overflow flag MUST be at address 0x602 | |
| 454 | |
| 455 | |
| 628 | 456 // Modes, Sequencing and Indexing (12 byte) |
| 623 | 457 |
| 458 static unsigned char main_status; // shadow register for char_O_main_status | |
| 459 static unsigned char deco_status; // shadow register for char_O_deco_status | |
| 460 static unsigned char deco_info; // shadow register for char_O_deco_info | |
| 461 static unsigned char deco_warnings; // shadow register for char_O_deco_warnings | |
| 462 static unsigned char next_planning_phase; // next calculation phase to be executed | |
| 463 static unsigned char tissue_increment; // selector for real/simulated tissues and time increment | |
| 464 static unsigned char sequence_timer; // timer to sequence deco engine tasks | |
| 465 static unsigned char ci; // index to the Buhlmann tables (compartment index) | |
| 466 static unsigned char cns_i; // index to the CNS tables (ppO2 range index) | |
| 467 static unsigned char i; // general purpose loop counter and index | |
| 468 static unsigned char fast; // selects 1 minute or 2 second ascent steps | |
| 628 | 469 static unsigned char stop_index; // current stop table position |
| 470 static unsigned char chained_stops; // counter for chained stop entries | |
| 623 | 471 |
| 472 | |
| 473 // Result Values from Calculation Functions (28 byte) | |
| 604 | 474 |
| 560 | 475 static float O2_ppO2; // ppO2 - calculated for pure oxygen at current depth |
| 604 | 476 static float OC_ppO2; // ppO2 - calculated for breathing in OC mode |
| 477 static float pSCR_ppO2; // ppO2 - calculated for breathing in pSCR mode | |
| 582 | 478 |
| 479 static float ppO2; // partial pressure of breathed oxygen | |
| 480 static float ppN2; // partial pressure of breathed nitrogen | |
| 481 static float ppHe; // partial pressure of breathed helium | |
| 482 | |
| 483 static unsigned char char_ppO2; // partial pressure of breathed oxygen, as integer 100 = 1.00 bar | |
| 484 static unsigned char NDL_time; // time in minutes until reaching NDL | |
| 623 | 485 static unsigned short ascent_time; // time in minutes needed for the ascent |
| 486 | |
| 487 | |
| 488 // Buhlmann Model Parameters (40 byte) | |
| 560 | 489 |
| 582 | 490 static float var_N2_a; // Buhlmann a, for current N2 tissue |
| 491 static float var_N2_b; // Buhlmann b, for current N2 tissue | |
| 492 static float var_He_a; // Buhlmann a, for current He tissue | |
| 493 static float var_He_b; // Buhlmann b, for current He tissue | |
| 623 | 494 static float var_a; // Buhlmann a, adopted to current N2/He ratio |
| 495 static float var_b; // Buhlmann b, adopted to current N2/He ratio | |
| 582 | 496 static float var_N2_e; // exposition, for current N2 tissue |
| 497 static float var_He_e; // exposition, for current He tissue | |
| 604 | 498 static float var_N2_ht; // half-time, for current N2 tissue |
| 499 static float var_He_ht; // half-time, for current He tissue | |
| 500 | |
| 501 | |
| 628 | 502 // CNS Coefficients (10 byte) |
| 503 | |
| 504 static float var_cns_a; // two coefficients approximation, gain | |
| 505 static float var_cns_b; // two coefficients approximation, offset | |
| 506 static unsigned short var_cns_c; // one coefficient approximation, value | |
| 507 | |
| 508 | |
| 623 | 509 // Vault to back-up & restore Tissue related Data (134 byte) |
| 510 | |
| 511 static float vault_pres_tissue_N2[NUM_COMP]; // stores the nitrogen tissue pressures | |
| 512 static float vault_pres_tissue_He[NUM_COMP]; // stores the helium tissue pressures | |
| 513 static float vault_CNS_fraction_real; // stores current CNS (float representation) | |
| 514 static unsigned char vault_deco_warnings; // stores warnings status | |
| 515 static unsigned char vault_deco_info; // stores info status | |
| 516 | |
| 517 | |
| 628 | 518 // Transfer values for convert_float_int and convert_float_to_char() (7 byte) |
| 519 | |
| 520 static float float_value; // input value, float | |
| 521 static unsigned short int_value; // output value, 16 bit | |
| 522 static unsigned char char_value; // output value, 8 bit | |
| 523 | |
| 524 | |
| 525 // Performance Profiling (4 byte) | |
| 526 | |
| 527 static unsigned short profiling_runtime; // performance measurement: runtime of current invocation | |
| 528 static unsigned char profiling_runs; // performance measurement: invocations per deco calculation cycle | |
| 529 static unsigned char profiling_phase; // performance measurement: current calculation phase | |
| 530 | |
| 531 | |
| 623 | 532 // 7 byte occupied by compiler-placed vars |
| 533 | |
| 534 | |
| 628 | 535 // 245 byte used, 11 byte left in this bank (4 bytes per float, 2 bytes per short, 1 byte per char) |
| 623 | 536 |
| 537 | |
| 538 | |
| 539 //---- Bank 12 parameters ----------------------------------------------------- | |
| 540 #ifndef UNIX | |
| 541 # pragma udata bank12=0xc00 | |
| 542 #endif | |
| 543 | |
| 544 // stops table (96 byte) | |
| 545 | |
| 546 static unsigned char internal_deco_depth[NUM_STOPS]; // depths of the stops in meters | |
| 547 static unsigned char internal_deco_time[NUM_STOPS]; // durations of the stops in minutes | |
| 548 static unsigned char internal_deco_gas[NUM_STOPS]; // gases used on the stops (0 / 1-5) | |
| 549 | |
| 550 | |
| 551 // 96 byte used, 160 byte left in this bank (4 bytes per float, 2 bytes per short, 1 byte per char) | |
| 560 | 552 |
| 0 | 553 |
| 554 //---- Bank 7 parameters ----------------------------------------------------- | |
| 555 #ifndef UNIX | |
| 556 # pragma udata bank7=0x700 | |
| 557 #endif | |
| 560 | 558 |
| 623 | 559 // Keep order and position of the variables in bank 7 as they are backed-up to & restored from EEPROM |
| 560 | |
| 561 static float real_pres_tissue_N2[NUM_COMP]; // 16 floats = 64 bytes | |
| 562 static float real_pres_tissue_He[NUM_COMP]; // 16 floats = 64 bytes | |
| 563 | |
| 564 static float sim_pres_tissue_N2[NUM_COMP]; // 16 floats = 64 bytes | |
| 565 static float sim_pres_tissue_He[NUM_COMP]; // 16 floats = 64 bytes | |
| 566 | |
| 567 // 256 byte used, bank is full | |
| 582 | 568 |
| 0 | 569 |
| 570 //---- Bank 8 parameters ----------------------------------------------------- | |
| 571 #ifndef UNIX | |
| 572 # pragma udata overlay bank8=0x800 | |
| 560 | 573 |
| 604 | 574 static char md_pi_subst[256]; // overlay C-code data stack here, too |
| 560 | 575 |
| 576 # define C_STACK md_pi_subst | |
| 0 | 577 #endif |
| 578 | |
| 582 | 579 |
| 0 | 580 // Back to bank6 for further tmp data |
| 582 | 581 // Do not delete this assignment, it is needed by the compiler/linker. |
| 0 | 582 #ifndef UNIX |
| 583 # pragma udata bank6 | |
| 584 #endif | |
| 585 | |
| 582 | 586 |
| 604 | 587 // ********************************************************************************************************************************* |
| 588 // | |
| 589 // L O O K - U P T A B L E S | |
| 590 // | |
| 591 // ********************************************************************************************************************************* | |
| 582 | 592 |
| 0 | 593 #ifndef UNIX |
| 623 | 594 # pragma romdata CNS_tables = 0x1DC80 // needs to be in the UPPER bank |
| 595 #endif | |
| 596 | |
| 597 rom const float CNS_ab[2*11] = { | |
| 628 | 598 // CNS increment per 2 sec = 1 / (a*ppO2 + b) with ppO2 in [cbar] |
| 623 | 599 // a b for ppO2 cbar range |
| 600 -533.07, 54000, // 51 - 60 (index 0) | |
| 601 -444.22, 48600, // 61 - 70 (index 1) | |
| 602 -355.38, 42300, // 71 - 80 (index 2) | |
| 603 -266.53, 35100, // 81 - 90 (index 3) | |
| 604 -177.69, 27000, // 91 - 100 (index 4) | |
| 605 -177.69, 27000, // 101 - 110 (index 5) | |
| 606 -88.84, 17100, // 111 - 120 (index 6) | |
| 607 -88.84, 17100, // 121 - 130 (index 7) | |
| 608 -88.84, 17100, // 131 - 140 (index 8) | |
| 609 -88.84, 17100, // 141 - 150 (index 9) | |
| 610 -222.11, 37350 // 151 - 160 (index 10) | |
| 611 }; | |
| 612 | |
| 628 | 613 rom const unsigned short CNS_c[1*18] = { |
| 614 // CNS increment per 2 sec = c / 100000.0 | |
| 623 | 615 // c in [1/100000] for ppO2 cbar range |
| 616 75, // 161 - 165 (index 0) | |
| 617 102, // 166 - 170 (index 1) | |
| 618 136, // 171 - 175 (index 2) | |
| 619 180, // 176 - 180 (index 3) | |
| 620 237, // 181 - 185 (index 4) | |
| 621 310, // 186 - 190 (index 5) | |
| 622 401, // 191 - 195 (index 6) | |
| 623 517, // 196 - 200 (index 7) | |
| 624 760, // 201 - 205 (index 8) | |
| 625 1100, // 206 - 210 (index 9) | |
| 626 1500, // 211 - 215 (index 10) | |
| 627 2090, // 216 - 220 (index 11) | |
| 628 2900, // 221 - 225 (index 12) | |
| 629 3900, // 226 - 230 (index 13) | |
| 630 4820, // 231 - 235 (index 14) | |
| 631 4820, // 236 - 240 (index 15) | |
| 632 4820, // 241 - 245 (index 16) | |
| 628 | 633 4820 // 246 - 250 (index 17) |
| 623 | 634 }; |
| 635 | |
| 636 | |
| 637 #ifndef UNIX | |
| 604 | 638 # pragma romdata Buhlmann_tables = 0x1DD00 // needs to be in the UPPER bank |
| 0 | 639 #endif |
| 640 | |
| 560 | 641 rom const float Buhlmann_ab[4*16] = { |
|
521
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642 // Data ZH-L16C, from Bühlmann Tauchmedizin 2002, option 1a (4mn) |
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643 // a for N2 b for N2 a of He b for He |
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644 1.2599, 0.5050, 1.7424, 0.4245, |
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645 1.0000, 0.6514, 1.3830, 0.5747, |
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646 0.8618, 0.7222, 1.1919, 0.6527, |
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647 0.7562, 0.7825, 1.0458, 0.7223, |
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648 0.6200, 0.8126, 0.9220, 0.7582, |
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649 0.5043, 0.8434, 0.8205, 0.7957, |
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650 0.4410, 0.8693, 0.7305, 0.8279, |
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651 0.4000, 0.8910, 0.6502, 0.8553, |
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652 0.3750, 0.9092, 0.5950, 0.8757, |
|
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|
653 0.3500, 0.9222, 0.5545, 0.8903, |
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654 0.3295, 0.9319, 0.5333, 0.8997, |
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655 0.3065, 0.9403, 0.5189, 0.9073, |
|
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|
656 0.2835, 0.9477, 0.5181, 0.9122, |
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657 0.2610, 0.9544, 0.5176, 0.9171, |
|
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658 0.2480, 0.9602, 0.5172, 0.9217, |
|
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|
659 0.2327, 0.9653, 0.5119, 0.9267 |
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|
660 }; |
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661 |
| 560 | 662 rom const float Buhlmann_ht[2*16] = { |
| 628 | 663 // Compartment half-life, in minutes |
| 560 | 664 //--- N2 ---- He ---------------------- |
|
521
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665 4.0, 1.51, |
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666 8.0, 3.02, |
|
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|
667 12.5, 4.72, |
|
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|
668 18.5, 6.99, |
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|
669 27.0, 10.21, |
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670 38.3, 14.48, |
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671 54.3, 20.53, |
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|
672 77.0, 29.11, |
|
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|
673 109.0, 41.20, |
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|
674 146.0, 55.19, |
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|
675 187.0, 70.69, |
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|
676 239.0, 90.34, |
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|
677 305.0, 115.29, |
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|
678 390.0, 147.42, |
|
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|
679 498.0, 188.24, |
|
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|
680 635.0, 240.03 |
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|
681 }; |
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|
682 |
|
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683 rom const float e2secs[2*16] = { |
| 628 | 684 // Integration constant for 2 seconds, |
| 685 // result of 1 - 2^(-1/(2sec/60sec * HT)) | |
|
521
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|
686 //---- N2 ------------- He ------------ |
| 623 | 687 5.75958E-03, 1.51848E-02, |
|
521
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|
688 2.88395E-03, 7.62144E-03, |
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|
689 1.84669E-03, 4.88315E-03, |
| 582 | 690 1.24813E-03, 3.29997E-03, |
| 691 8.55371E-04, 2.26041E-03, | |
| 692 6.03079E-04, 1.59437E-03, | |
| 693 4.25414E-04, 1.12479E-03, | |
| 694 3.00019E-04, 7.93395E-04, | |
| 695 2.11949E-04, 5.60641E-04, | |
| 696 1.58240E-04, 4.18555E-04, | |
| 697 1.23548E-04, 3.26795E-04, | |
| 698 9.66686E-05, 2.55722E-04, | |
| 699 7.57509E-05, 2.00387E-04, | |
| 700 5.92416E-05, 1.56716E-04, | |
| 701 4.63943E-05, 1.22734E-04, | |
| 702 3.63850E-05, 9.62538E-05 | |
|
521
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703 //------------------------------------- |
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704 }; |
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705 |
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706 rom const float e1min[2*16] = { |
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707 // Integration constant for 1 minute, |
| 628 | 708 // result of 1 - 2^(-1/HT) |
|
521
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709 //----- N2 --------- e 1min He -------- |
| 582 | 710 1.59104E-01, 3.68109E-01, |
| 711 8.29960E-02, 2.05084E-01, | |
| 712 5.39424E-02, 1.36579E-01, | |
| 713 3.67742E-02, 9.44046E-02, | |
| 714 2.53454E-02, 6.56359E-02, | |
| 715 1.79351E-02, 4.67416E-02, | |
| 716 1.26840E-02, 3.31991E-02, | |
| 717 8.96152E-03, 2.35301E-02, | |
| 718 6.33897E-03, 1.66832E-02, | |
| 719 4.73633E-03, 1.24808E-02, | |
| 720 3.69981E-03, 9.75753E-03, | |
| 721 2.89600E-03, 7.64329E-03, | |
| 722 2.27003E-03, 5.99417E-03, | |
| 723 1.77572E-03, 4.69082E-03, | |
| 724 1.39089E-03, 3.67548E-03, | |
| 725 1.09097E-03, 2.88359E-03 | |
|
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726 //------------------------------------- |
|
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727 }; |
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728 |
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729 rom const float e10min[2*16] = { |
| 628 | 730 // Integration constant for 10 minutes, |
| 731 // result of 1 - 2^(-10/ht) | |
|
521
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732 //---- N2 -------------- He ----------- |
| 582 | 733 8.23223E-01, 9.89851E-01, |
| 734 5.79552E-01, 8.99258E-01, | |
| 735 4.25651E-01, 7.69737E-01, | |
| 736 3.12487E-01, 6.29027E-01, | |
| 737 2.26416E-01, 4.92821E-01, | |
| 738 1.65547E-01, 3.80407E-01, | |
| 739 1.19840E-01, 2.86538E-01, | |
| 740 8.60863E-02, 2.11886E-01, | |
| 741 6.16117E-02, 1.54849E-01, | |
| 742 4.63665E-02, 1.18026E-01, | |
| 743 3.63881E-02, 9.34005E-02, | |
| 744 2.85855E-02, 7.38569E-02, | |
| 745 2.24698E-02, 5.83504E-02, | |
| 746 1.76160E-02, 4.59303E-02, | |
| 747 1.38222E-02, 3.61528E-02, | |
| 748 1.08563E-02, 2.84646E-02 | |
|
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749 //------------------------------------- |
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750 }; |
| 0 | 751 |
| 604 | 752 |
| 753 // ********************************************************************************************************************************* | |
| 0 | 754 // |
| 604 | 755 // H E L P E R F U N C T I O N S |
| 756 // | |
| 757 // ********************************************************************************************************************************* | |
| 758 | |
| 759 | |
| 628 | 760 // p2deco code moved from 0x0D000 to 0x0C000 in v.108 |
| 0 | 761 #ifndef UNIX |
| 584 | 762 # pragma code p2_deco = 0x0C000 |
| 0 | 763 #endif |
| 764 | |
| 765 | |
| 766 ////////////////////////////////////////////////////////////////////////////// | |
| 767 // Bump to blue-screen when an assert is wrong | |
| 623 | 768 #ifdef _DEBUG |
| 0 | 769 void assert_failed(PARAMETER short int line) |
| 770 { | |
| 771 } | |
| 772 #endif | |
| 773 | |
| 604 | 774 |
| 0 | 775 ////////////////////////////////////////////////////////////////////////////// |
| 628 | 776 // When calling C code from ASM context, the C data stack pointer need to be |
| 777 // reset. The C stack is located in bank 8. | |
| 0 | 778 |
| 779 #ifdef CROSS_COMPILE | |
| 584 | 780 # define RESET_C_STACK |
| 0 | 781 #else |
| 623 | 782 # ifdef _DEBUG |
| 584 | 783 # define RESET_C_STACK fillDataStack(); |
| 784 void fillDataStack(void) | |
| 785 { | |
| 786 _asm | |
| 604 | 787 LFSR 1,C_STACK |
| 788 MOVLW 0xCC | |
| 789 loop: MOVWF POSTINC1,0 | |
| 790 TSTFSZ FSR1L,0 | |
| 791 BRA loop | |
| 792 | |
| 793 LFSR 1,C_STACK | |
| 794 LFSR 2,C_STACK | |
| 584 | 795 _endasm |
| 796 } | |
| 797 # else | |
| 798 # define RESET_C_STACK \ | |
| 799 _asm \ | |
| 604 | 800 LFSR 1,C_STACK \ |
| 801 LFSR 2,C_STACK \ | |
| 584 | 802 _endasm |
| 803 # endif | |
| 0 | 804 #endif |
| 805 | |
| 604 | 806 |
| 0 | 807 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 808 // Reset timer 5 |
| 809 // | |
| 810 // Note: TMR5 is configured in 16 bit mode: a value written to TMR5H is buffered | |
| 811 // and will be written to TMR5 together with a successive write to TMR5L. | |
| 812 // As we don't know in which bank the code will be executed, we use either | |
| 813 // the bank-save "movff" command, or address mapping via access bank (",0"). | |
| 814 // | |
| 815 static void load_tmr5(void) | |
| 0 | 816 { |
| 817 #ifndef CROSS_COMPILE | |
| 584 | 818 _asm |
| 623 | 819 movff 0x601,0xF7D // bank-safe load TMR5H from C variable tmr5_value first |
| 820 movff 0x600,0xF7C // bank-safe load TMR5L from c variable tmr5_value thereafter | |
| 821 bcf 0xFBA,1,0 // clear timer 5 overrun flag (0xFBA = PIR5, bit 1 = TMR5IF) | |
| 822 _endasm | |
| 0 | 823 #else |
| 623 | 824 return; |
| 825 #endif | |
| 826 } | |
| 827 | |
| 828 | |
| 829 ////////////////////////////////////////////////////////////////////////////// | |
| 830 // Read timer 5 | |
| 831 // | |
| 832 // Note: TMR5 reads in multiples of 1/32 ms, 30.51757813 us/bit to be precise. | |
| 833 // TMR5 is configured in 16 bit mode: on reading of TMR5L the contents of | |
| 834 // TMR5H is latched and can be read afterwards without potential rollover. | |
| 835 // As we don't know in which bank the code will be executed, we use either | |
| 836 // the bank-save "movff" command, or address mapping via access bank (",0"). | |
| 837 // | |
| 838 static void read_tmr5(void) | |
| 839 { | |
| 840 #ifndef CROSS_COMPILE | |
| 841 _asm | |
| 842 movff 0xF7C,0x600 // copy TMR5L to C variable tmr5_value, low byte first | |
| 843 movff 0xF7D,0x601 // copy TMR5H to C variable tmr5_value, high byte thereafter | |
| 844 clrf WREG,0 // clear WREG to 0x00 = no overrun by default | |
| 845 btfsc 0xFBA,1,0 // did timer 5 overrun? (0xFBA = PIR5, bit 1 = TMR5IF) | |
| 846 setf WREG,0 // YES - set WREG to 0xff = overrun detected | |
| 847 movff WREG,0x602 // copy WREG to C variable tmr5_overflow | |
| 848 _endasm | |
| 849 #else | |
| 850 return; | |
| 0 | 851 #endif |
| 852 } | |
| 853 | |
| 604 | 854 |
| 0 | 855 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 856 // Read CNS coefficients a and b |
| 857 // | |
| 858 static void read_CNS_ab_coefficient(void) | |
| 859 { | |
| 860 #ifndef CROSS_COMPILE | |
| 861 // Note: We don't use far ROM pointer, because handling | |
| 862 // 24 bit is to complex, hence we have to set the | |
| 863 // UPPER page ourself... | |
| 864 // -> set to zero if tables are moved to lower pages! | |
| 865 _asm | |
| 866 movlw 1 | |
| 867 movwf TBLPTRU,0 | |
| 868 _endasm | |
| 869 #endif | |
| 870 | |
| 871 { | |
| 872 overlay rom const float* ptr = &CNS_ab[2*cns_i]; | |
| 873 var_cns_a = *ptr++; | |
| 874 var_cns_b = *ptr++; | |
| 875 } | |
| 876 } | |
| 877 | |
| 878 | |
| 879 ////////////////////////////////////////////////////////////////////////////// | |
| 880 // Read CNS coefficient c | |
| 881 // | |
| 882 static void read_CNS_c_coefficient(void) | |
| 883 { | |
| 884 #ifndef CROSS_COMPILE | |
| 885 // Note: We don't use far ROM pointer, because handling | |
| 886 // 24 bit is to complex, hence we have to set the | |
| 887 // UPPER page ourself... | |
| 888 // -> set to zero if tables are moved to lower pages! | |
| 889 _asm | |
| 890 movlw 1 | |
| 891 movwf TBLPTRU,0 | |
| 892 _endasm | |
| 893 #endif | |
| 894 | |
| 895 { | |
| 896 overlay rom const unsigned short* ptr = &CNS_c[cns_i]; | |
| 897 var_cns_c = *ptr++; | |
| 898 } | |
| 899 } | |
| 900 | |
| 901 ////////////////////////////////////////////////////////////////////////////// | |
| 902 // Read Buhlmann coefficients a and b for compartment ci | |
| 0 | 903 // |
| 560 | 904 static void read_Buhlmann_coefficients(void) |
| 0 | 905 { |
| 906 #ifndef CROSS_COMPILE | |
| 604 | 907 // Note: We don't use far ROM pointer, because handling |
| 908 // 24 bit is too complex, hence we have to set the | |
| 909 // UPPER page ourself... | |
| 628 | 910 // -> set to zero if tables are moved to lower pages! |
| 584 | 911 _asm |
| 604 | 912 movlw 1 |
| 913 movwf TBLPTRU,0 | |
| 584 | 914 _endasm |
| 0 | 915 #endif |
| 916 | |
| 584 | 917 assert( ci < NUM_COMP ); |
| 918 | |
| 604 | 919 // use an interleaved array (AoS) to access coefficients with a single addressing |
| 584 | 920 { |
| 921 overlay rom const float* ptr = &Buhlmann_ab[4*ci]; | |
| 922 var_N2_a = *ptr++; | |
| 923 var_N2_b = *ptr++; | |
| 924 var_He_a = *ptr++; | |
| 925 var_He_b = *ptr++; | |
| 926 } | |
| 0 | 927 } |
| 928 | |
| 604 | 929 |
| 0 | 930 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 931 // Read Buhlmann increments for compartment ci |
| 604 | 932 // If period == 0 : 2 sec interval |
| 933 // 1 : 1 min interval | |
| 934 // 2 : 10 min interval | |
| 560 | 935 static void read_Buhlmann_times(PARAMETER char period) |
| 0 | 936 { |
| 937 #ifndef CROSS_COMPILE | |
| 604 | 938 // Note: We don't use far ROM pointer, because handling |
| 939 // 24 bit is to complex, hence we have to set the | |
| 940 // UPPER page ourself... | |
| 941 // -> set to zero if tables are moved to lower pages! | |
| 584 | 942 _asm |
| 604 | 943 movlw 1 |
| 944 movwf TBLPTRU,0 | |
| 584 | 945 _endasm |
| 0 | 946 #endif |
| 947 | |
| 584 | 948 assert( ci < NUM_COMP ); |
| 949 | |
| 623 | 950 // Integration Intervals |
| 584 | 951 switch(period) |
| 952 { | |
| 953 case 0: //---- 2 sec ----------------------------------------------------- | |
| 954 { | |
| 955 overlay rom const float* ptr = &e2secs[2*ci]; | |
| 956 var_N2_e = *ptr++; | |
| 957 var_He_e = *ptr++; | |
| 958 } | |
| 959 break; | |
| 960 | |
| 961 case 1: //---- 1 min ----------------------------------------------------- | |
| 962 { | |
| 963 overlay rom const float* ptr = &e1min[2*ci]; | |
| 964 var_N2_e = *ptr++; | |
| 965 var_He_e = *ptr++; | |
| 966 } | |
| 967 break; | |
| 968 | |
| 969 case 2: //---- 10 min ---------------------------------------------------- | |
| 970 { | |
| 971 overlay rom const float* ptr = &e10min[2*ci]; | |
| 972 var_N2_e = *ptr++; | |
| 973 var_He_e = *ptr++; | |
| 974 } | |
| 623 | 975 break; |
| 584 | 976 |
| 977 default: | |
| 623 | 978 assert(0); // code execution shall never pass along here! |
| 584 | 979 } |
| 0 | 980 } |
| 981 | |
| 604 | 982 |
| 0 | 983 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 984 // Read Buhlmann half-times for compartment ci |
| 0 | 985 // |
| 560 | 986 static void read_Buhlmann_ht(void) |
| 0 | 987 { |
| 988 | |
| 989 #ifndef CROSS_COMPILE | |
| 604 | 990 // Note: We don't use far ROM pointer, because handling |
| 991 // 24 bit is to complex, hence we have to set the | |
| 992 // UPPER page ourself... | |
| 993 // -> Set to zero if tables are moved to lower pages! | |
| 584 | 994 _asm |
| 604 | 995 movlw 1 |
| 996 movwf TBLPTRU,0 | |
| 584 | 997 _endasm |
| 0 | 998 #endif |
| 999 | |
| 584 | 1000 assert( ci < NUM_COMP ); |
| 1001 { | |
| 1002 overlay rom const float* ptr = &Buhlmann_ht[2*ci]; | |
| 1003 var_N2_ht = *ptr++; | |
| 1004 var_He_ht = *ptr++; | |
| 1005 } | |
| 1006 | |
| 604 | 1007 assert( 4.0 <= var_N2_ht && var_N2_ht <= 635.0 ); |
| 584 | 1008 assert( 1.5099 <= var_He_ht && var_He_ht <= 240.03 ); |
| 0 | 1009 } |
| 1010 | |
| 604 | 1011 |
| 0 | 1012 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 1013 // Calculate adopted Buhlmann coefficients |
| 1014 // | |
| 1015 // Input: var_N2_a, var_N2_b coefficients for N2 | |
| 1016 // var_He_a, var_He_b coefficients for He | |
| 1017 // calc_pres_tissue_N2 partial pressure of N2 in tissue | |
| 1018 // calc_pres_tissue_He partial pressure of He in tissue | |
| 1019 // pres_tissue total pressure in tissue | |
| 1020 // | |
| 1021 // Output: var_a, var_b coefficients adopted by N2/He ratio | |
| 604 | 1022 // |
| 1023 static void adopt_Buhlmann_coefficients(void) | |
| 1024 { | |
| 1025 // adopt a and b coefficients to current N2/He ratio inside the tissue | |
| 623 | 1026 |
| 1027 #ifdef _helium | |
| 1028 | |
| 1029 var_a = (var_N2_a * calc_pres_tissue_N2 + var_He_a * calc_pres_tissue_He) / pres_tissue; | |
| 1030 var_b = (var_N2_b * calc_pres_tissue_N2 + var_He_b * calc_pres_tissue_He) / pres_tissue; | |
| 1031 | |
| 1032 #else | |
| 1033 | |
| 1034 var_a = var_N2_a; | |
| 1035 var_b = var_N2_b; | |
| 1036 | |
| 1037 #endif | |
| 1038 | |
| 1039 } | |
| 1040 | |
| 1041 | |
| 1042 ////////////////////////////////////////////////////////////////////////////// | |
| 628 | 1043 // Calculate sim_pres_respiration from char_depth_sim |
| 1044 // | |
| 1045 // Input: char_depth_sim simulated depth in meters | |
| 1046 // pres_surface surface pressure | |
| 1047 // | |
| 1048 // Output: sim_pres_respiration simulated depth in absolute pressure | |
| 1049 // | |
| 1050 static void calc_sim_pres_respiration(void) | |
| 1051 { | |
| 1052 sim_pres_respiration = (float)char_depth_sim * METER_TO_BAR + pres_surface; | |
| 1053 } | |
| 1054 | |
| 1055 | |
| 1056 ////////////////////////////////////////////////////////////////////////////// | |
| 623 | 1057 // Calculate partial pressure of N2 in respired air at surface pressure |
| 1058 // | |
| 1059 // Input: pres_surface surface pressure | |
| 1060 // | |
| 1061 // Output: N2_equilibrium partial pressure of N2 in surface air | |
| 1062 // | |
| 1063 static void calc_N2_equilibrium(void) | |
| 1064 { | |
| 1065 N2_equilibrium = 0.7902 * (pres_surface - ppWater); | |
| 1066 } | |
| 1067 | |
| 1068 | |
| 1069 ////////////////////////////////////////////////////////////////////////////// | |
| 1070 // Get, safeguard and convert the saturation and desaturation factors | |
| 1071 // | |
| 1072 // Input: char_I_saturation_multiplier saturation factor (integer) | |
| 1073 // char_I_desaturation_multiplier desaturation factor (integer) | |
| 1074 // | |
| 1075 // Output: float_saturation_multiplier saturation factor (float) | |
| 1076 // float_desaturation_multiplier desaturation factor (float) | |
| 1077 // | |
| 1078 static void get_saturation_factors(void) | |
| 1079 { | |
| 1080 // safeguard input parameters that are constant during the course of the dive | |
| 1081 if( char_I_saturation_multiplier < 100 ) char_I_saturation_multiplier = 100; | |
| 1082 if( char_I_saturation_multiplier > 140 ) char_I_saturation_multiplier = 140; | |
| 1083 | |
| 1084 if( char_I_desaturation_multiplier < 60 ) char_I_desaturation_multiplier = 60; | |
| 1085 if( char_I_desaturation_multiplier > 100 ) char_I_desaturation_multiplier = 100; | |
| 1086 | |
| 1087 // convert input parameters to float numbers | |
| 1088 float_saturation_multiplier = 0.01 * char_I_saturation_multiplier; | |
| 1089 float_desaturation_multiplier = 0.01 * char_I_desaturation_multiplier; | |
| 1090 } | |
| 1091 | |
| 1092 | |
| 1093 ////////////////////////////////////////////////////////////////////////////// | |
| 1094 // apply_saturation_factors | |
| 1095 // | |
| 1096 // Apply safety factors for both ZH-L16 models. | |
| 1097 // | |
| 1098 // Modified: temp_tissue safeguarded tissue increment/decrement | |
| 1099 // | |
| 1100 static void apply_saturation_factors(void) | |
| 1101 { | |
| 1102 assert( 0.0 < float_desaturation_multiplier && float_desaturation_multiplier <= 1.0 ); | |
| 1103 assert( 1.0 <= float_saturation_multiplier && float_saturation_multiplier <= 2.0 ); | |
| 1104 | |
| 1105 if ( temp_tissue < 0.0 ) temp_tissue *= float_desaturation_multiplier; | |
| 1106 else temp_tissue *= float_saturation_multiplier; | |
| 1107 } | |
| 1108 | |
| 1109 | |
| 1110 ////////////////////////////////////////////////////////////////////////////// | |
| 1111 // convert_float_to_int | |
| 1112 // | |
| 1113 // Converts a float within range 0.0 - 9.99 into 16 bit integer scaled in 1/100. | |
| 1114 // | |
| 1115 static void convert_float_to_int(void) | |
| 1116 { | |
| 1117 if ( float_value < 0.005 ) int_value = 0; | |
| 1118 else if ( float_value >= 9.985 ) int_value = 999; | |
| 1119 else int_value = (unsigned short)(100 * float_value + 0.5); | |
| 1120 } | |
| 1121 | |
| 1122 | |
| 1123 ////////////////////////////////////////////////////////////////////////////// | |
| 1124 // convert_float_to_char | |
| 1125 // | |
| 1126 // Converts a float within range 0.0 - 255 into 8 bit integer | |
| 1127 // | |
| 1128 static void convert_float_to_char(void) | |
| 1129 { | |
| 1130 if (float_value < 0.0) char_value = 0; | |
| 1131 else if (float_value >= 254.5) char_value = 255; | |
| 1132 else char_value = (unsigned char)(float_value + 0.5); | |
| 604 | 1133 } |
| 1134 | |
| 1135 | |
| 1136 // ********************************************************************************************************************************* | |
| 1137 // | |
| 1138 // J U M P I N F U N C T I O N S | |
| 1139 // | |
| 1140 // ********************************************************************************************************************************* | |
| 1141 | |
| 582 | 1142 |
| 1143 ////////////////////////////////////////////////////////////////////////////// | |
| 1144 // deco_calc_hauptroutine | |
| 1145 // | |
| 1146 // called from: divemode.asm | |
| 1147 // | |
| 628 | 1148 // Called two times per second during diving, updates the |
| 1149 // tissues every second (i.e. on every second invocation). | |
| 582 | 1150 // |
| 628 | 1151 // On each computation cycle: |
| 582 | 1152 // - Updates deco table (char_O_deco_time/depth) with new values, |
| 1153 // - updates ascent time, and | |
| 628 | 1154 // - sets status to zero (so we can check a cycle has finished). |
| 582 | 1155 // |
| 1156 void deco_calc_hauptroutine(void) | |
| 1157 { | |
| 1158 RESET_C_STACK | |
| 1159 calc_hauptroutine(); | |
| 1160 } | |
| 1161 | |
| 623 | 1162 |
| 1163 ////////////////////////////////////////////////////////////////////////////// | |
| 1164 // deco_init_output_vars | |
| 1165 // | |
| 1166 // called from divemode.asm | |
| 1167 // | |
| 1168 // Initializes all output variables to their default values. | |
| 1169 // | |
| 1170 void deco_init_output_vars(void) | |
| 1171 { | |
| 1172 RESET_C_STACK | |
| 1173 init_output_vars(); | |
| 1174 } | |
| 1175 | |
| 628 | 1176 |
| 582 | 1177 ////////////////////////////////////////////////////////////////////////////// |
| 1178 // deco_clear_tissue | |
| 1179 // | |
| 1180 // called from: start.asm | |
| 1181 // menu_tree.asm | |
| 1182 // simulator.asm | |
| 1183 // | |
| 628 | 1184 // Sets all tissues to equilibrium with air at ambient pressure, |
| 582 | 1185 // resets all CNS values, any warnings and resets all model output. |
| 1186 // | |
| 1187 void deco_clear_tissue(void) | |
| 1188 { | |
| 1189 RESET_C_STACK | |
| 1190 clear_tissue(); | |
| 1191 } | |
| 1192 | |
| 623 | 1193 |
| 582 | 1194 ////////////////////////////////////////////////////////////////////////////// |
| 1195 // deco_calc_dive_interval | |
| 1196 // | |
| 1197 // called from: simulator.asm | |
| 1198 // | |
| 628 | 1199 // Updates tissues and CNS value for char_I_dive_interval minutes on air at |
| 1200 // ambient pressure and calculates resulting saturation and ceiling for a | |
| 1201 // GF-high of 100% (ceiling and saturation not used by simulator.asm) | |
| 582 | 1202 // |
| 1203 void deco_calc_dive_interval(void) | |
| 1204 { | |
| 1205 RESET_C_STACK | |
| 1206 calc_interval(char_I_dive_interval); | |
| 1207 } | |
| 1208 | |
| 623 | 1209 |
| 582 | 1210 ////////////////////////////////////////////////////////////////////////////// |
| 1211 // deco_calc_dive_interval_1min | |
| 1212 // | |
| 1213 // called from: start.asm | |
| 1214 // sleepmode.asm | |
| 1215 // surfmode.asm | |
| 1216 // menu_tree.asm | |
| 1217 // ghostwriter.asm | |
| 1218 // | |
| 604 | 1219 // Updates tissues and CNS value for 1 minute on air at ambient pressure and |
| 628 | 1220 // calculates resulting saturation and ceiling for a GF-high of 100%. |
| 582 | 1221 // |
| 1222 void deco_calc_dive_interval_1min(void) | |
| 1223 { | |
| 1224 RESET_C_STACK | |
| 1225 calc_interval(1); | |
| 1226 } | |
| 1227 | |
| 1228 | |
| 1229 ////////////////////////////////////////////////////////////////////////////// | |
| 604 | 1230 // deco_calc_dive_interval_10min |
| 582 | 1231 // |
| 1232 // called from: sleepmode.asm | |
| 1233 // | |
| 604 | 1234 // Updates tissues and CNS value for 10 minutes on air at ambient pressure and |
| 628 | 1235 // calculates resulting saturation and ceiling for a GF-high of 100%. |
| 582 | 1236 // |
| 1237 void deco_calc_dive_interval_10min(void) | |
| 1238 { | |
| 1239 RESET_C_STACK | |
| 1240 calc_interval(10); | |
| 1241 } | |
| 1242 | |
| 1243 | |
| 1244 ////////////////////////////////////////////////////////////////////////////// | |
| 1245 // deco_calc_desaturation_time | |
| 1246 // | |
| 1247 // called from: start.asm | |
| 1248 // surfmode.asm | |
| 1249 // menu_tree.asm | |
| 1250 // ghostwriter.asm | |
| 1251 // | |
| 1252 // Computes desaturation and no-fly times. | |
| 1253 // | |
| 1254 void deco_calc_desaturation_time(void) | |
| 1255 { | |
| 1256 RESET_C_STACK | |
| 1257 calc_desaturation_time(); | |
| 1258 } | |
| 1259 | |
| 623 | 1260 |
| 582 | 1261 ////////////////////////////////////////////////////////////////////////////// |
| 1262 // deco_push_tissues_to_vault | |
| 1263 // | |
| 1264 // called from: simulator.asm | |
| 1265 // | |
| 1266 // Makes a backup of the state of the real tissues and the deco engine. | |
| 1267 // | |
| 1268 void deco_push_tissues_to_vault(void) | |
| 1269 { | |
| 1270 RESET_C_STACK | |
| 1271 push_tissues_to_vault(); | |
| 1272 } | |
| 1273 | |
| 623 | 1274 |
| 582 | 1275 ////////////////////////////////////////////////////////////////////////////// |
| 1276 // deco_pull_tissues_from_vault | |
| 1277 // | |
| 1278 // called from: simulator.asm | |
| 1279 // ghostwriter.asm | |
| 1280 // | |
| 1281 // Restores the state of the real tissues and the deco engine from the backup. | |
| 1282 // | |
| 1283 void deco_pull_tissues_from_vault(void) | |
| 1284 { | |
| 1285 RESET_C_STACK | |
| 1286 pull_tissues_from_vault(); | |
| 1287 } | |
| 1288 | |
| 604 | 1289 |
| 1290 // ********************************************************************************************************************************* | |
| 1291 // | |
| 1292 // M A I N F U N C T I O N S | |
| 1293 // | |
| 1294 // ********************************************************************************************************************************* | |
| 582 | 1295 |
| 1296 | |
| 1297 ////////////////////////////////////////////////////////////////////////////// | |
| 628 | 1298 // Calculate the next deco stop |
| 0 | 1299 // |
| 1300 // INPUT, fixed during dive: | |
| 623 | 1301 // pres_surface : surface pressure (as absolute pressure) |
| 1302 // char_I_depth_last_deco : depth of the last deco stop | |
| 1303 // | |
| 628 | 1304 // INPUT, may change during dive: |
| 623 | 1305 // GF_high : GF high factor |
| 1306 // GF_low : GF low factor | |
| 1307 // | |
| 1308 // INPUT & OUTPUT | |
| 1309 // char_depth_sim : simulated depth in meters | |
| 1310 // GF_low_depth : GF low depth in current calculation cycle | |
| 1311 // GF_slope : GF slope in current calculation cycle | |
| 1312 // GF_low_depth_norm/_alt : frozen GF low depth reference | |
| 1313 // GF_slope_norm/_alt : frozen GF slope | |
| 0 | 1314 // |
| 1315 // OUTPUT | |
| 623 | 1316 // char_depth_last : depth we came from |
| 1317 // sim_pres_respiration : simulated depth in absolute pressure | |
| 1318 // | |
| 1319 // RETURN | |
| 1320 // TRUE: a stop is needed, FALSE: no stop needed | |
| 1321 // | |
| 1322 static unsigned char find_next_stop(void) | |
| 0 | 1323 { |
| 623 | 1324 overlay unsigned char depth_1min; |
| 1325 overlay unsigned char depth_limit; | |
| 628 | 1326 overlay unsigned char stop_depth; |
| 1327 overlay unsigned char next_stop; | |
| 582 | 1328 overlay unsigned char need_stop; |
| 1329 | |
| 623 | 1330 |
| 628 | 1331 // memorize the depth we came from |
| 623 | 1332 char_depth_last = char_depth_sim; |
| 1333 | |
| 628 | 1334 // calculate the ceiling (minimum relative pressure) for the current depth |
| 1335 if( char_I_deco_model == 0 ) calc_limit(1.0); // deco or not - straight Buhlmann | |
| 1336 else if( NDL_time ) calc_limit(GF_high); // not in deco | |
| 1337 else if( char_depth_sim >= GF_low_depth ) calc_limit(GF_low); // in deco with GF, below or at low depth reference | |
| 1338 else calc_limit(GF_high - GF_slope * (float)char_depth_sim); // in deco with GF, above low depth reference | |
| 1339 | |
| 1340 // convert the ceiling from relative pressure to meters, | |
| 1341 // rounded up (i.e. made deeper) to next full meter, | |
| 1342 // limiting at surface. | |
| 1343 depth_limit = (ceiling > 0.0) ? (unsigned char)(ceiling * BAR_TO_METER + 0.99) : 0; | |
| 1344 | |
| 1345 // calculate the stop depth, i.e. round up (make deeper) to | |
| 1346 // the next multiple of 3 meters using integer arithmetics | |
| 1347 stop_depth = 3 * ( (depth_limit + 2) / 3 ); | |
| 623 | 1348 |
| 1349 // apply correction for the shallowest stop | |
| 628 | 1350 if( stop_depth == 3 ) stop_depth = char_I_depth_last_deco; |
| 623 | 1351 |
| 1352 // compute depth in meters that will be reached in 1 minute of ascent | |
| 1353 // at a speed of char_I_ascent_speed (5..10 m/min) | |
| 1354 if( char_depth_sim > char_I_ascent_speed ) | |
| 1355 { | |
| 1356 depth_1min = char_depth_sim - char_I_ascent_speed; | |
| 1357 } | |
| 1358 else | |
| 1359 { | |
| 1360 depth_1min = 0; | |
| 1361 } | |
| 1362 | |
| 628 | 1363 // is the stop depth shallower than the depth that can be reached within 1 minute, |
| 1364 // or are we allowed to surface AND can we reach the surface within 1 minute? | |
| 1365 if( ( ( stop_depth < depth_1min ) ) | |
| 1366 || ( ( stop_depth == 0 ) && ( depth_1min == 0 ) ) | |
| 1367 ) | |
| 623 | 1368 { |
| 1369 // YES - report the depth that will be reached within 1 minute of ascent | |
| 1370 char_depth_sim = depth_1min; | |
| 1371 | |
| 628 | 1372 // - no stop needed |
| 1373 need_stop = 0; | |
| 1374 | |
| 623 | 1375 // - done |
| 1376 goto done; | |
| 1377 } | |
| 1378 | |
| 1379 // ----------------------------------------------------------------------- | |
| 628 | 1380 // we need to make a stop now, or need to stay at the current stop depth |
| 623 | 1381 // ----------------------------------------------------------------------- |
| 1382 | |
| 1383 // set stop data | |
| 1384 need_stop = 1; | |
| 628 | 1385 char_depth_sim = stop_depth; |
| 1386 | |
| 1387 // Apply correction in case the stop is to be placed deeper than a | |
| 1388 // previously recorded stop for a gas change. This may happen because | |
| 1389 // the deco stops are placed at the next deeper multiple of 3 meters | |
| 1390 // instead of the real stop's depth. Correction is to relocate the | |
| 1391 // deco stop to the depth of the last gas change. The resulting combined | |
| 1392 // stop's duration will be the sum of the configured gas change time plus | |
| 1393 // the duration of the deco stop itself. | |
| 1394 if( 0 < internal_deco_depth[stop_index] ) | |
| 1395 if( char_depth_sim > internal_deco_depth[stop_index] ) | |
| 1396 char_depth_sim = internal_deco_depth[stop_index]; | |
| 623 | 1397 |
| 1398 // done so far if using straight Buhlmann | |
| 1399 if( char_I_deco_model == 0 ) goto done; | |
| 1400 | |
| 1401 // ----------------------------------------------------------------------- | |
| 628 | 1402 // we need to make or hold a stop and we are using the GF extension |
| 623 | 1403 // ----------------------------------------------------------------------- |
| 1404 | |
| 628 | 1405 // is the stop depth deeper than the GF low depth reference used up to now? |
| 1406 if( stop_depth > GF_low_depth ) | |
| 623 | 1407 { |
| 1408 // YES - update the reference | |
| 628 | 1409 GF_low_depth = stop_depth; |
| 623 | 1410 GF_slope = (GF_high - GF_low) / (float)GF_low_depth; |
| 1411 | |
| 1412 // store for use in next cycles | |
| 1413 if( deco_status & CALC_NORM ) | |
| 560 | 1414 { |
| 623 | 1415 GF_low_depth_norm = GF_low_depth; |
| 1416 GF_slope_norm = GF_slope; | |
| 582 | 1417 } |
| 560 | 1418 else |
| 1419 { | |
| 623 | 1420 GF_low_depth_alt = GF_low_depth; |
| 1421 GF_slope_alt = GF_slope; | |
| 560 | 1422 } |
| 623 | 1423 } |
| 1424 | |
| 1425 // We have a (first) stop. But with a steep GF slope, the stop(s) after this | |
| 1426 // first stop may be allowed to ascent to, too. This is because the gradient | |
| 1427 // factor that will be used at the next depth(s) will allow more tissue super- | |
| 1428 // saturation, maybe so much more that the next stop(s) will be allowed to | |
| 1429 // ascent to. So we have to probe the next stops that are within the reach of | |
| 1430 // 1 minute of ascent as well. | |
| 1431 | |
| 628 | 1432 // probe all stop depths that are in reach of 1 minute of ascent |
| 1433 next_stop = stop_depth; | |
| 1434 | |
| 1435 while(next_stop > 0) | |
| 623 | 1436 { |
| 628 | 1437 // compute the depth of the next stop ... |
| 1438 if ( next_stop <= char_I_depth_last_deco ) next_stop = 0; | |
| 1439 else if ( next_stop == 6 ) next_stop = char_I_depth_last_deco; | |
| 1440 else next_stop -= 3; | |
| 1441 | |
| 1442 // would the next stop be beyond the 1 minute limit? | |
| 1443 if( next_stop < depth_1min ) | |
| 582 | 1444 { |
| 628 | 1445 // YES - signal that probing is done |
| 1446 next_stop = 0; | |
| 582 | 1447 } |
| 1448 else | |
| 560 | 1449 { |
| 628 | 1450 // NO - compute the ceiling at the next stop depth |
| 1451 calc_limit(GF_high - GF_slope * (float)next_stop); | |
| 1452 | |
| 1453 // - limit ceiling to positive values, i.e. the surface | |
| 1454 if( ceiling < 0.0 ) ceiling = 0.0; | |
| 1455 | |
| 1456 // - check if this stop depth would be allowed | |
| 1457 if( next_stop >= (unsigned char)(ceiling * BAR_TO_METER + 0.99) ) | |
| 1458 { | |
| 1459 // YES - this stop depth is allowed | |
| 1460 char_depth_sim = next_stop; | |
| 1461 | |
| 1462 // - no stop needed if stop depth actually is the surface | |
| 1463 if( next_stop == 0 ) need_stop = 0; | |
| 1464 } | |
| 560 | 1465 } |
| 582 | 1466 } |
| 1467 | |
| 623 | 1468 |
| 1469 // ----------------------------------------------------------------------- | |
| 1470 // common end for straight Buhlmann and Buhlmann with GF extension | |
| 1471 // ----------------------------------------------------------------------- | |
| 1472 | |
| 1473 done: | |
| 1474 | |
| 1475 // calculate absolute pressure at the depth found | |
| 628 | 1476 calc_sim_pres_respiration(); |
| 0 | 1477 |
| 582 | 1478 return need_stop; |
| 0 | 1479 } |
| 1480 | |
| 604 | 1481 |
| 0 | 1482 ////////////////////////////////////////////////////////////////////////////// |
| 628 | 1483 // Find current gas in the list and get its change depth |
| 560 | 1484 // |
| 623 | 1485 // Input: char_I_current_gas_num number of current gas (1..5 or 6) |
| 1486 // | |
| 1487 // Output: sim_gas_current_num 1..6 or 0 for the manually configured gas/dil | |
| 1488 // sim_gas_current_depth change depth (MOD) of the gas/dil in meters | |
| 560 | 1489 // |
| 628 | 1490 static void gas_take_current(void) |
| 560 | 1491 { |
| 623 | 1492 assert( 1 <= char_I_current_gas_num && char_I_current_gas_num <= 6 ); |
| 1493 | |
| 1494 if( char_I_current_gas_num <= NUM_GAS ) // gas/diluent 1-5 | |
| 582 | 1495 { |
| 623 | 1496 sim_gas_current_num = char_I_current_gas_num; |
| 1497 sim_gas_current_depth = char_I_deco_gas_change[sim_gas_current_num-1]; | |
| 628 | 1498 |
| 1499 // capture case of non-configured change depth | |
| 1500 if( sim_gas_current_depth == 0 ) sim_gas_current_depth = 255; | |
| 582 | 1501 } |
| 1502 else | |
| 560 | 1503 { |
| 623 | 1504 sim_gas_current_num = 0; |
| 604 | 1505 sim_gas_current_depth = char_I_gas6_depth; |
| 560 | 1506 } |
| 1507 } | |
| 1508 | |
| 1509 | |
| 1510 ////////////////////////////////////////////////////////////////////////////// | |
| 628 | 1511 // Find the gas with the shallowest change depth below or at the current depth |
| 560 | 1512 // |
| 623 | 1513 // Input: char_depth_sim simulated depth in meters |
| 1514 // sim_gas_current_num number of the currently used gas/dil | |
| 1515 // char_I_deco_gas_type[] types of the gases/dils | |
| 1516 // char_I_deco_gas_change[] change depths of the gases/dils | |
| 1517 // | |
| 628 | 1518 // Modified: sim_gas_best_num index of the gas (1..5) - only if return value is true |
| 1519 // sim_gas_best_depth switch depth - only if return value is true | |
| 623 | 1520 // |
| 1521 // Return value is TRUE if a better gas is available | |
| 560 | 1522 // |
| 628 | 1523 static unsigned char gas_find_best(void) |
| 560 | 1524 { |
| 1525 overlay unsigned char switch_depth = 255; | |
| 604 | 1526 overlay unsigned char switch_gas = 0; |
| 560 | 1527 overlay unsigned char j; |
| 582 | 1528 |
| 628 | 1529 // loop over all gases to find the shallowest one below or at current depth |
| 604 | 1530 for( j = 0; j < NUM_GAS; ++j ) |
| 560 | 1531 { |
| 623 | 1532 // Is this gas available? |
| 1533 if( char_I_deco_gas_type[j] > 0 ) | |
| 604 | 1534 |
| 1535 // Is the change depth of the this gas deeper than or | |
| 1536 // at least equal to the current depth? | |
| 623 | 1537 if( char_I_deco_gas_change[j] >= char_depth_sim ) |
| 604 | 1538 |
| 628 | 1539 // Is the change depth of this gas shallower than or |
| 1540 // at least equal to the change depth of the best gas | |
| 1541 // found so far, or is it the first better gas found? | |
| 1542 if( char_I_deco_gas_change[j] <= switch_depth ) | |
| 1543 | |
| 1544 #ifdef _gas_contingency | |
| 1545 // Is there still enough of this gas or doesn't it matter? | |
| 1546 if( ( gas_volume_need[j] < gas_volume_avail[j] ) || ( !char_I_gas_contingency ) ) | |
| 1547 #endif | |
| 604 | 1548 |
| 1549 // If there is a yes to all these questions, we have a better gas! | |
| 560 | 1550 { |
| 628 | 1551 // memorize this gas (1..5) and its change depth |
| 1552 switch_gas = j+1; | |
| 1553 switch_depth = char_I_deco_gas_change[j]; | |
| 560 | 1554 } |
| 1555 } // continue looping through all gases to eventually find an even better gas | |
| 1556 | |
| 628 | 1557 // has a best gas been found? |
| 560 | 1558 if( switch_gas ) |
| 1559 { | |
| 628 | 1560 // YES - export the best gas and its change depth |
| 1561 sim_gas_best_num = switch_gas; | |
| 1562 sim_gas_best_depth = switch_depth; | |
| 1563 | |
| 1564 // is the best gas different from the current gas? | |
| 1565 if( sim_gas_best_num != sim_gas_current_num ) | |
| 1566 { | |
| 1567 // YES - signal advice for a gas change | |
| 1568 return 1; | |
| 1569 } | |
| 560 | 1570 } |
| 628 | 1571 |
| 1572 // no best gas found or current gas is the best gas | |
| 1573 return 0; | |
| 1574 } | |
| 1575 | |
| 1576 | |
| 1577 ////////////////////////////////////////////////////////////////////////////// | |
| 1578 // Switch to the best gas | |
| 1579 // | |
| 1580 // Input: sim_gas_best_num index of the best gas (1..5) | |
| 1581 // sim_gas_best_depth switch depth of the best gas | |
| 1582 // | |
| 1583 // Modified: sim_gas_current_num index of the new gas (1..5) | |
| 1584 // sim_gas_current_depth switch depth of the new gas | |
| 1585 // | |
| 1586 static void gas_take_best(void) | |
| 1587 { | |
| 1588 // set new gas | |
| 1589 sim_gas_current_num = sim_gas_best_num; | |
| 1590 sim_gas_current_depth = sim_gas_best_depth; | |
| 0 | 1591 } |
| 1592 | |
| 604 | 1593 |
| 0 | 1594 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 1595 // Set calc_N2/He/O2_ratios by sim_gas_current_num |
| 1596 // | |
| 1597 // Input: sim_gas_current_num index of gas to use | |
| 1598 // real_O2_ratio, real_He_ratio if gas = 0 (the manually set gas) | |
| 1599 // char_I_deco_O2/He_ratio[] if gas = 1..5 (the configured gases) | |
| 1600 // | |
| 1601 // Output: sim_N2_ratio, sim_He_ratio ratios of the inert gases | |
| 1602 // sim_pSCR_drop ppO2 drop in pSCR loop | |
| 0 | 1603 // |
| 582 | 1604 static void gas_set_ratios(void) |
| 0 | 1605 { |
| 582 | 1606 overlay float sim_IG_ratio; |
| 1607 | |
| 623 | 1608 assert( 0 <= sim_gas_current_num <= NUM_GAS ); |
| 1609 | |
| 1610 | |
| 1611 #ifdef _helium | |
| 582 | 1612 // get gas ratios |
| 623 | 1613 if( sim_gas_current_num == 0 ) |
| 560 | 1614 { |
| 604 | 1615 sim_O2_ratio = real_O2_ratio; |
| 1616 sim_He_ratio = real_He_ratio; | |
| 560 | 1617 } |
| 1618 else | |
| 1619 { | |
| 623 | 1620 sim_O2_ratio = 0.01 * char_I_deco_O2_ratio[sim_gas_current_num-1]; |
| 1621 sim_He_ratio = 0.01 * char_I_deco_He_ratio[sim_gas_current_num-1]; | |
| 560 | 1622 } |
| 1623 | |
| 582 | 1624 // inert gas ratio (local helper variable) |
| 604 | 1625 sim_IG_ratio = 1.00 - sim_O2_ratio; |
| 582 | 1626 |
| 1627 // N2 ratio | |
| 604 | 1628 sim_N2_ratio = sim_IG_ratio - sim_He_ratio; |
| 623 | 1629 #else |
| 1630 // get O2 ratio | |
| 1631 sim_O2_ratio = ( sim_gas_current_num == 0 ) ? real_O2_ratio : 0.01 * char_I_deco_O2_ratio[sim_gas_current_num-1]; | |
| 1632 | |
| 1633 // set H2 ratio to zero | |
| 1634 sim_He_ratio = 0.0; | |
| 1635 | |
| 1636 // inert gas ratio (local helper variable) | |
| 1637 sim_IG_ratio = 1.00 - sim_O2_ratio; | |
| 1638 | |
| 1639 // N2 ratio | |
| 1640 sim_N2_ratio = sim_IG_ratio; | |
| 1641 #endif | |
| 1642 | |
| 1643 #ifdef _ccr_pscr | |
| 582 | 1644 // ppO2 drop in pSCR loop |
| 604 | 1645 sim_pSCR_drop = sim_IG_ratio * float_pSCR_factor; |
| 623 | 1646 #endif |
| 582 | 1647 |
| 1648 | |
| 1649 assert( 0.0 <= sim_N2_ratio && sim_N2_ratio <= 0.95 ); | |
| 1650 assert( 0.0 <= sim_He_ratio && sim_He_ratio <= 0.95 ); | |
| 1651 assert( (sim_N2_ratio + sim_He_ratio) <= 0.95 ); | |
| 0 | 1652 } |
| 1653 | |
| 604 | 1654 |
| 0 | 1655 ////////////////////////////////////////////////////////////////////////////// |
| 604 | 1656 // Compute respired ppO2, ppN2 and ppHe |
| 0 | 1657 // |
| 604 | 1658 // Input: tissue_increment : selector for targeting simulated or real tissues |
| 623 | 1659 // main_status : breathing mode for real tissues |
| 1660 // deco_status : breathing mode for simulated tissues | |
| 604 | 1661 // sim_/real_O2_ratio : (simulated) O2 ratio breathed |
| 1662 // sim_/real_N2_ratio : (simulated) N2 ratio breathed | |
| 1663 // sim_/real_He_ratio : (simulated) He ratio breathed | |
| 1664 // sim_/real_pres_respiration : (simulated) respiration pressure [bar] | |
| 1665 // sim_/real_pSCR_drop : (simulated) pSCR O2 drop | |
| 1666 // pres_surface : surface pressure [bar] | |
| 1667 // char_I_const_ppO2 : ppO2 reported from sensors or setpoint [cbar] | |
| 628 | 1668 // float_deco_distance : safety factor, additional depth below stop depth [bar] - not used any more |
| 604 | 1669 // ppWater : water-vapor pressure inside respiratory tract [bar] |
| 0 | 1670 // |
| 604 | 1671 // Output: ppN2 : respired N2 partial pressure |
| 1672 // ppHe : respired He partial pressure | |
| 623 | 1673 // char_ppO2 : breathed ppO2 in %, used for CNS calculation |
| 0 | 1674 // |
| 582 | 1675 void calc_alveolar_pressures(void) |
| 0 | 1676 { |
| 604 | 1677 overlay float calc_pres_respiration; |
| 582 | 1678 overlay float calc_O2_ratio; |
| 1679 overlay float calc_N2_ratio; | |
| 623 | 1680 |
| 1681 #ifdef _helium | |
| 582 | 1682 overlay float calc_He_ratio; |
| 623 | 1683 #endif |
| 1684 | |
| 1685 #ifdef _ccr_pscr | |
| 582 | 1686 overlay float calc_pSCR_drop; |
| 623 | 1687 #endif |
| 582 | 1688 |
| 1689 overlay unsigned char status; | |
| 1690 | |
| 1691 | |
| 623 | 1692 assert( 0.00 <= real_N2_ratio && real_N2_ratio <= 1.00 ); |
| 1693 assert( 0.00 <= real_He_ratio && real_He_ratio <= 1.00 ); | |
| 1694 assert( (real_N2_ratio + real_He_ratio) <= 1.00 ); | |
| 604 | 1695 assert( 0.800 < real_pres_respiration && real_pres_respiration < 14.0 ); |
| 1696 | |
| 623 | 1697 assert( 0.00 <= sim_N2_ratio && real_N2_ratio <= 1.00 ); |
| 1698 assert( 0.00 <= sim_He_ratio && real_He_ratio <= 1.00 ); | |
| 1699 assert( (sim_N2_ratio + sim_He_ratio) <= 1.00 ); | |
| 582 | 1700 assert( 0.800 < sim_pres_respiration && sim_pres_respiration < 14.0 ); |
| 1701 | |
| 1702 | |
| 1703 // get input data according to context | |
| 623 | 1704 if( tissue_increment & TISSUE_SELECTOR ) |
| 582 | 1705 { |
| 1706 //---- real tissues ----------------------------------------------------------- | |
| 604 | 1707 calc_pres_respiration = real_pres_respiration; |
| 623 | 1708 |
| 1709 status = main_status; | |
| 604 | 1710 calc_O2_ratio = real_O2_ratio; |
| 1711 calc_N2_ratio = real_N2_ratio; | |
| 623 | 1712 |
| 1713 #ifdef _helium | |
| 604 | 1714 calc_He_ratio = real_He_ratio; |
| 623 | 1715 #endif |
| 1716 | |
| 1717 #ifdef _ccr_pscr | |
| 1718 calc_pSCR_drop = real_pSCR_drop; | |
| 1719 #endif | |
| 582 | 1720 } |
| 1721 else | |
| 1722 { | |
| 1723 //---- simulated tissues ------------------------------------------------------ | |
| 623 | 1724 |
| 1725 // correct sim_pres_respiration if shallower than calculated stop depth | |
| 1726 calc_pres_respiration = ( real_pres_respiration < sim_pres_respiration ) ? real_pres_respiration : sim_pres_respiration; | |
| 1727 | |
| 628 | 1728 // +++ pressure surcharge if outside deco stops area yet ??? |
| 1729 | |
| 623 | 1730 status = deco_status; |
| 604 | 1731 calc_O2_ratio = sim_O2_ratio; |
| 1732 calc_N2_ratio = sim_N2_ratio; | |
| 623 | 1733 |
| 1734 #ifdef _helium | |
| 604 | 1735 calc_He_ratio = sim_He_ratio; |
| 623 | 1736 #endif |
| 1737 | |
| 1738 #ifdef _ccr_pscr | |
| 1739 calc_pSCR_drop = sim_pSCR_drop; | |
| 1740 #endif | |
| 582 | 1741 } |
| 1742 | |
| 1743 //---- OC, CCR and Bailout Mode Gas Calculations ----------------------------------- | |
| 1744 | |
| 1745 // calculate ppO2 of pure oxygen | |
| 604 | 1746 O2_ppO2 = calc_pres_respiration - ppWater; |
| 1747 | |
| 1748 // capture failure condition in case real_pres_respiration is < ppWater (should never happen...) | |
| 582 | 1749 if( O2_ppO2 < 0.0 ) O2_ppO2 = 0.0; |
| 1750 | |
| 602 | 1751 // calculate ppO2 of the pure gas (OC, diluent) |
| 582 | 1752 OC_ppO2 = O2_ppO2 * calc_O2_ratio; |
| 1753 | |
| 623 | 1754 #ifdef _ccr_pscr |
| 1755 | |
| 582 | 1756 // calculate pSCR ppO2 |
| 1757 pSCR_ppO2 = OC_ppO2 - calc_pSCR_drop; | |
| 1758 | |
| 1759 // capture failure condition in case pSCR_ppO2 becomes negative | |
| 1760 if( pSCR_ppO2 < 0.0 ) pSCR_ppO2 = 0.0; | |
| 1761 | |
| 1762 | |
| 1763 //---- Loop modes : adjust ppN2 and ppHe for change in ppO2 due to setpoint (CCR) or drop (pSCR) --- | |
| 623 | 1764 if( status & MODE_LOOP ) |
| 582 | 1765 { |
| 1766 overlay float const_ppO2; | |
| 604 | 1767 overlay float max_ppO2; |
| 582 | 1768 |
| 1769 // get the current sensor reading (CCR / pSCR if fitted) or the fixed setpoint (CCR) / a zero (pSCR) | |
| 1770 const_ppO2 = 0.01 * char_I_const_ppO2; | |
| 1771 | |
| 1772 // Limit the setpoint to the maximum physically possible ppO2. This prevents for | |
| 1773 // example calculating with a setpoint of 1.3 bar in only 2 meters of depth. | |
| 604 | 1774 // Additionally, the ppO2 can be further reduced to account for exhaled inert gases |
| 623 | 1775 // accumulating in the loop by the user-adjustable setting char_I_CC_max_frac_O2. |
| 604 | 1776 // (ppWater is neglected here) |
| 623 | 1777 max_ppO2 = 0.01 * char_I_CC_max_frac_O2 * calc_pres_respiration; |
| 604 | 1778 |
| 1779 if( const_ppO2 > max_ppO2 ) const_ppO2 = max_ppO2; | |
| 582 | 1780 |
| 1781 // check which kind of loop we are on | |
| 623 | 1782 if( status & MODE_PSCR ) |
| 560 | 1783 { |
| 582 | 1784 //---- pSCR Mode -------------------------------------------------------------------------- |
| 1785 | |
| 1786 // Use the sensor value if available, but only in real tissue context! | |
| 1787 // In all other cases use calculated ppO2. | |
| 623 | 1788 if ( char_I_const_ppO2 && (tissue_increment & TISSUE_SELECTOR)) ppO2 = const_ppO2; |
| 1789 else ppO2 = pSCR_ppO2; | |
| 582 | 1790 } |
| 560 | 1791 else |
| 1792 { | |
| 582 | 1793 //---- CCR Mode --------------------------------------------------------------------------- |
| 1794 | |
| 604 | 1795 // derive breathed ppO2 from (char_I_)const_ppO2, which holds sensor reading or selected setpoint |
| 582 | 1796 ppO2 = const_ppO2; |
| 560 | 1797 } |
| 1798 | |
| 604 | 1799 // adjust overall gas pressure for change in ppO2 due to setpoint (CCR) or drop (pSCR), |
| 1800 // capture potential failure conditions first: | |
| 1801 if( ( calc_pres_respiration < ppO2 ) // sensor reading or selected setpoint is higher than ambient pressure | |
| 623 | 1802 || ( calc_O2_ratio > 0.995 ) ) // diluent is pure O2, i.e. calc_N2_ratio + calc_He_ratio = 0 would give a div/0 |
| 560 | 1803 { |
| 604 | 1804 // failure condition present, set predetermined result |
| 1805 calc_pres_respiration = 0.0; | |
| 1806 } | |
| 1807 else | |
| 1808 { | |
| 1809 // no failure conditions present, equation can be executed | |
| 1810 calc_pres_respiration -= ppO2; | |
| 623 | 1811 #ifdef _helium |
| 604 | 1812 calc_pres_respiration /= calc_N2_ratio + calc_He_ratio; |
| 623 | 1813 #else |
| 1814 calc_pres_respiration /= calc_N2_ratio; | |
| 1815 #endif | |
| 560 | 1816 } |
| 582 | 1817 } |
| 1818 else | |
| 623 | 1819 #endif // _ccr_pscr |
| 604 | 1820 { |
| 1821 //---- OC mode --------------------------------------------------------------------------------- | |
| 582 | 1822 |
| 1823 // breathed ppO2 is ppO2 of pure gas | |
| 1824 ppO2 = OC_ppO2; | |
| 560 | 1825 } |
| 1826 | |
| 582 | 1827 |
| 604 | 1828 //---- derive char_ppO2 in [cbar], used for calculating CNS% --------------------------------------- |
| 1829 | |
| 582 | 1830 if ( ppO2 < 0.01 ) char_ppO2 = 0; |
| 1831 else if ( ppO2 >= 2.545 ) char_ppO2 = 255; | |
| 1832 else char_ppO2 = (unsigned char)(100 * ppO2 + 0.5); | |
| 1833 | |
| 1834 | |
| 1835 //---- calculate ppN2 and ppHe --------------------------------------------------------------------- | |
| 1836 | |
| 628 | 1837 // add deco safety distance when working on simulated tissues - not used any more |
| 1838 // if( !(tissue_increment & TISSUE_SELECTOR) ) calc_pres_respiration += float_deco_distance; | |
| 604 | 1839 |
| 1840 // compute ppN2 and ppHe, capture potential failure conditions first: | |
| 1841 if( calc_pres_respiration > ppWater ) | |
| 582 | 1842 { |
| 604 | 1843 // subtract water vapor pressure |
| 1844 calc_pres_respiration -= ppWater; | |
| 1845 | |
| 1846 // calculate partial pressures | |
| 1847 ppN2 = calc_N2_ratio * calc_pres_respiration; | |
| 623 | 1848 |
| 1849 #ifdef _helium | |
| 604 | 1850 ppHe = calc_He_ratio * calc_pres_respiration; |
| 623 | 1851 #else |
| 1852 ppHe = 0.0; | |
| 1853 #endif | |
| 1854 | |
| 582 | 1855 } |
| 1856 else | |
| 1857 { | |
| 604 | 1858 // calculated respired pressure is < water vapor pressure, thus set ppN2 and ppHe to 0 |
| 582 | 1859 ppN2 = 0.0; |
| 1860 ppHe = 0.0; | |
| 1861 } | |
| 628 | 1862 |
| 1863 #ifdef _helium | |
| 1864 // calculating real tissues? | |
| 1865 if( tissue_increment & TISSUE_SELECTOR ) | |
| 1866 { | |
| 1867 overlay unsigned char temp; | |
| 1868 | |
| 1869 // compute gas density of current mix in multiples of 0.01 grams per liter | |
| 1870 int_O_gas_density = (unsigned int)( 17.9 * ppHe + 125.1 * ppN2 + 142.8 * ppO2 ); | |
| 1871 | |
| 1872 // convert gas density into a 8 bit integer | |
| 1873 temp = (unsigned char)( (int_O_gas_density + 9) / 10 ); | |
| 1874 | |
| 1875 // limit to display max and set warning or attention flag | |
| 1876 if( temp > 99 ) int_O_gas_density = 999 | INT_FLAG_WARNING; | |
| 1877 else if( temp > char_I_gas_density_warn ) int_O_gas_density |= INT_FLAG_WARNING; | |
| 1878 else if( temp > char_I_gas_density_att ) int_O_gas_density |= INT_FLAG_ATTENTION; | |
| 1879 } | |
| 1880 #endif | |
| 0 | 1881 } |
| 1882 | |
| 604 | 1883 |
| 0 | 1884 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 1885 // Initializes all output variables to their default values |
| 1886 // | |
| 1887 static void init_output_vars(void) | |
| 1888 { | |
| 1889 // clear the internal stops table from remains lasting from the previous dive or deco calculator run | |
| 1890 clear_deco_table(); | |
| 1891 | |
| 1892 // publish the cleared stops table to the display functions | |
| 1893 publish_deco_table(); | |
| 1894 | |
| 1895 // clear the published gas needs in volume and pressure | |
| 1896 for( i = 0; i < NUM_GAS; ++i ) | |
| 1897 { | |
| 1898 int_O_gas_need_vol[i] = 0; | |
| 1899 int_O_gas_need_pres[i] = 0 + INT_FLAG_ZERO + INT_FLAG_INVALID; | |
| 1900 } | |
| 1901 | |
| 1902 // values initially to be set to zero | |
| 1903 int_O_ceiling = 0; // ceiling depth in mbar | |
| 1904 char_O_deco_info = 0; // clear all deco information flags | |
| 1905 char_O_deco_warnings = 0; // clear all deco warning flags | |
| 1906 | |
| 1907 // default desaturation time to 24 hours (it will not be computed during a dive) | |
| 1908 int_O_desaturation_time = 1440; | |
| 1909 | |
| 1910 // initialize CNS values | |
| 1911 int_O_CNS_norm = 0 + INT_FLAG_INVALID; | |
| 1912 int_O_CNS_alt = 0 + INT_FLAG_INVALID; | |
| 1913 | |
| 1914 // initialize NDL times | |
| 1915 char_O_NDL_norm = 240; | |
| 1916 char_O_NDL_alt = 240; | |
| 1917 | |
| 1918 // initialize ascent times | |
| 1919 int_O_TTS_norm = 0; | |
| 1920 int_O_TTS_alt = 0 + INT_FLAG_INVALID + INT_FLAG_NOT_COMPUTED_YET; | |
| 1921 | |
| 1922 #ifdef _rx_functions | |
| 1923 // clear TR values | |
| 1924 int_O_SAC_measured = 0 + INT_FLAG_NOT_AVAIL; // SAC rate | |
| 1925 int_O_pressure_need[0] = 0 + INT_FLAG_NOT_AVAIL; // pressure need to reading 1 | |
| 1926 int_O_pressure_need[1] = 0 + INT_FLAG_NOT_AVAIL; // pressure need to reading 2 | |
| 628 | 1927 int_O_tank_pressure = 0; // tank pressure for logging |
| 623 | 1928 #endif |
| 1929 | |
| 628 | 1930 #ifdef _helium |
| 1931 int_O_gas_density = 0; | |
| 1932 #endif | |
| 1933 | |
| 1934 // also clear any time++ request | |
| 1935 char_I_sim_advance_time = 0; | |
| 623 | 1936 } |
| 1937 | |
| 1938 | |
| 1939 ////////////////////////////////////////////////////////////////////////////// | |
| 1940 // Reset all tissues to surface pressure equilibrium state | |
| 1941 // | |
| 1942 // Input: int_I_pres_surface current surface pressure in hPa (mbar) | |
| 1943 // | |
| 1944 // Output: real_pres_tissue_N2[] partial pressure of N2 in real tissues | |
| 1945 // real_pres_tissue_He[] partial pressure of He in real tissues | |
| 1946 // char_O_tissue_pres_N2[] partial pressure of N2 for tissue graphics | |
| 1947 // char_O_tissue_pres_He[] partial pressure of He for tissue graphics | |
| 1948 // char_O_tissue_pressure[] total pressure for tissue graphics | |
| 1949 // CNS_fraction_real internal CNS value | |
| 1950 // int_O_CNS_current current CNS value | |
| 1951 // int_O_CNS_norm CNS value at end of normal dive plan | |
| 1952 // int_O_CNS_alt CNS value at end of alternative dive plan | |
| 1953 // char_O_deco_warnings deco warnings vector | |
| 1954 // char_O_NDL_norm remaining NDL time in normal dive plan | |
| 1955 // char_O_NDL_alt remaining NDL time in alternative dive plan | |
| 1956 // int_O_TTS_norm ascent time (TTS) in normal dive plan | |
| 1957 // int_O_TTS_alt ascent time (TTS) in alternative dive plan | |
| 1958 // int_O_lead_supersat supersaturation of the leading tissue | |
| 0 | 1959 // |
| 1960 static void clear_tissue(void) | |
| 1961 { | |
| 623 | 1962 // safeguard and convert the surface pressure (mbar -> bar) (*) |
| 1963 if( int_I_pres_surface < 500 ) pres_surface = 0.500; | |
| 1964 else pres_surface = 0.001 * int_I_pres_surface; | |
| 1965 | |
| 1966 // calculate partial pressure of N2 in respired air at surface pressure | |
| 1967 calc_N2_equilibrium(); | |
| 1968 | |
| 1969 // cycle through the 16 Buhlmann tissues | |
| 604 | 1970 for( ci = 0; ci < NUM_COMP; ci++ ) |
| 582 | 1971 { |
| 623 | 1972 // reset tissue pressures |
| 1973 real_pres_tissue_He[ci] = 0.0; // He | |
| 1974 real_pres_tissue_N2[ci] = N2_equilibrium; // N2 | |
| 1975 | |
| 629 | 1976 // reset tissue pressures for scaled tissue graphics |
| 623 | 1977 char_O_tissue_pres_He[ci] = 0; // He |
| 1978 char_O_tissue_pres_N2[ci] = 10; // N2 | |
| 1979 char_O_tissue_pressure[ci] = 10; // combined | |
| 582 | 1980 } |
| 1981 | |
| 1982 // reset CNS values | |
| 623 | 1983 CNS_fraction_real = 0.0; |
| 1984 int_O_CNS_current = int_O_CNS_norm = int_O_CNS_alt = 0; | |
| 582 | 1985 |
| 1986 // reset some more vars to their defaults | |
| 623 | 1987 char_O_NDL_norm = 240; |
| 1988 char_O_NDL_alt = 240; | |
| 1989 int_O_TTS_norm = 0; | |
| 1990 int_O_TTS_alt = 0; | |
| 1991 int_O_lead_supersat = 0; | |
| 1992 | |
| 1993 // reset all warning and info flags | |
| 1994 char_O_deco_warnings = 0; | |
| 1995 char_O_deco_info = 0; | |
| 0 | 1996 } |
| 1997 | |
| 582 | 1998 |
| 0 | 1999 ////////////////////////////////////////////////////////////////////////////// |
| 628 | 2000 // Deco engine main code |
| 0 | 2001 // |
| 623 | 2002 // This is the major code in dive mode, it calculates the tissue pressures, |
| 2003 // the bottom time, and it calculates the ascend with all deco stops, etc. | |
| 2004 // | |
| 2005 // Input: char_O_main_status deco engine control and real tissues mode | |
| 2006 // char_O_deco_status deco engine control and simulated tissues mode | |
| 2007 // char_I_sim_advance_time mailbox for bottom time incrementing | |
| 2008 // | |
| 2009 // char_I_SAC_work gas usage rate during working phase in l/min | |
| 2010 // char_I_SAC_deco gas usage rate during deco stops phase in l/min | |
| 2011 // | |
| 2012 // char_I_deco_model selector for GF extension | |
| 2013 // char_I_ascent_speed ascent speed | |
| 2014 // char_I_saturation_multiplier safety factor for tissue saturation | |
| 2015 // char_I_desaturation_multiplier safety factor for tissue desaturation | |
| 2016 // | |
| 2017 // char_I_pressure_gas[] amount of gas available for ascent in bar | |
| 2018 // int_I_pressure_drop[] pressure drop used to calculate SAC rate | |
| 2019 // char_I_gas_avail_size[] size of the tanks in liters | |
| 2020 // | |
| 2021 // Output: int_O_O2_ppO2 partial pressure of pure O2 at current depth | |
| 2022 // int_O_pure_ppO2 partial pressure of O2 in gas at current depth | |
| 2023 // int_O_pSCR_ppO2 partial pressure of O2 in gas at current depth, corrected for pSCR mode | |
| 2024 // int_O_breathed_ppO2 partial pressure of O2 currently breathed | |
| 2025 // | |
| 2026 // char_O_deco_status deco engine computations status | |
| 2027 // char_O_deco_info deco engine information vector | |
| 2028 // char_O_deco_warnings deco engine warnings vector | |
| 2029 // | |
| 2030 // char_O_NDL_norm remaining NDL time in normal dive plan | |
| 2031 // char_O_NDL_alt remaining NDL time in alternative dive plan | |
| 2032 // int_O_TTS_norm ascent time (TTS) in normal dive plan | |
| 2033 // int_O_TTS_alt ascent time (TTS) in alternative dive plan | |
| 2034 // int_O_CNS_norm CNS value at end of normal dive plan | |
| 2035 // int_O_CNS_alt CNS value at end of alternative dive plan | |
| 2036 // | |
| 2037 // int_O_gas_need_vol calculated gas volumes needed for ascent | |
| 2038 // int_O_gas_need_pres calculated gas pressures needed for ascent | |
| 2039 // | |
| 2040 // int_O_SAC_measured measured surface air consumption (SAC) rate in l/min | |
| 2041 // | |
| 2042 // Modified: int_IO_pressure_value[] warning flags added to pressure reading 1 & 2 | |
| 2043 // int_IO_pressure_need[] pressure needs to pressure reading 1 & 2 | |
| 0 | 2044 // |
| 2045 static void calc_hauptroutine(void) | |
| 2046 { | |
| 623 | 2047 overlay unsigned short int_ppO2_min; |
| 628 | 2048 overlay unsigned short int_ppO2_max_warn; |
| 2049 overlay unsigned short int_ppO2_max_att; | |
| 623 | 2050 overlay unsigned short int_ppO2_max_dil; |
| 2051 overlay float EAD; | |
| 2052 overlay float END; | |
| 2053 | |
| 2054 //============================================================================================= | |
| 2055 | |
| 2056 // | |
| 2057 //--- Setup Part --------------------------------------------------------------------------------- | |
| 2058 // | |
| 2059 | |
| 2060 // set time limit for preempting deco calculations, timer is 16 bit and increments every 1/32 ms | |
| 2061 tmr5_value = 65535 - (32 * BUDGET_PER_SECOND / INVOKES_PER_SECOND); | |
| 2062 | |
| 2063 // load timer | |
| 2064 load_tmr5(); | |
| 2065 | |
| 2066 // read command flags and set up what to do | |
| 2067 switch( char_O_deco_status & COMMAND_MASK ) | |
| 560 | 2068 { |
| 623 | 2069 |
| 2070 case INITIALIZE: | |
| 2071 case INITIALIZE_START_NORM: | |
| 2072 case INITIALIZE_START_ALT: | |
| 2073 | |
| 2074 // copy master modes to shadow registers | |
| 2075 main_status = char_O_main_status; | |
| 2076 deco_status = char_O_deco_status; | |
| 2077 | |
| 2078 // clear all command flags on the master mode to signal that the command is read | |
| 2079 char_O_deco_status &= ~COMMAND_MASK; | |
| 2080 | |
| 2081 // clear the initialization flag on the shadow copy | |
| 2082 deco_status &= ~INITIALIZE; | |
| 2083 | |
| 2084 // initialize the sequence timer | |
| 2085 sequence_timer = 0; | |
| 2086 | |
| 2087 // set the calculation phase to start with to doing the once-per-dive initialization | |
| 2088 next_planning_phase = PHASE_10_DIVE_INIT; | |
| 2089 | |
| 2090 break; | |
| 2091 | |
| 2092 | |
| 2093 case START_NORM: | |
| 2094 case START_ALT: | |
| 2095 | |
| 2096 // copy master modes to shadow registers | |
| 2097 main_status = char_O_main_status; | |
| 2098 deco_status = char_O_deco_status; | |
| 2099 | |
| 2100 // clear all command flags on the master mode to signal that the command is read | |
| 2101 char_O_deco_status &= ~COMMAND_MASK; | |
| 2102 | |
| 2103 // set the calculation phase to start with to doing the cyclic initialization | |
| 628 | 2104 next_planning_phase = PHASE_20_CYCLIC_INIT; |
| 623 | 2105 |
| 2106 // continue in CALCULATING | |
| 2107 | |
| 2108 | |
| 2109 case CALCULATING: | |
| 2110 | |
| 2111 // keep current calculation phase | |
| 2112 | |
| 2113 // step the sequence timer | |
| 2114 sequence_timer = (sequence_timer < INVOKES_PER_SECOND * 2 - 1) ? sequence_timer + 1 : 0; | |
| 2115 | |
| 2116 break; | |
| 560 | 2117 } |
| 2118 | |
| 582 | 2119 |
| 623 | 2120 // |
| 2121 //--- End of Setup Part ----------------------------------------------------------------------- | |
| 2122 // | |
| 2123 | |
| 2124 //============================================================================================= | |
| 2125 | |
| 2126 // | |
| 2127 //---- Calculations Part (real Tissues) ------------------------------------------------------- | |
| 2128 // | |
| 2129 | |
| 582 | 2130 |
| 604 | 2131 // target the real tissues with 2 second increments by default |
| 623 | 2132 tissue_increment = TISSUE_SELECTOR | 0; |
| 2133 | |
| 2134 | |
| 2135 // Tasks every second, if more than 1 invocation per second: on the first section of the second. | |
| 2136 // Requests for tissue "fast forward" are executed immediately. | |
| 2137 #if (INVOKES_PER_SECOND > 1) | |
| 2138 if( ( sequence_timer == 0 ) | |
| 2139 || ( sequence_timer == INVOKES_PER_SECOND ) | |
| 2140 || ( char_I_sim_advance_time > 0 ) | |
| 2141 ) | |
| 2142 #endif | |
| 584 | 2143 { |
| 623 | 2144 // acquire current environmental data |
| 2145 calc_hauptroutine_data_input(); | |
| 2146 | |
| 628 | 2147 // calculate ppO2, ppN2 and ppHe for real tissues |
| 623 | 2148 calc_alveolar_pressures(); |
| 2149 | |
| 2150 // add decent calculation here and include trigger in above if-statement | |
| 2151 // TODO | |
| 2152 | |
| 2153 } // tasks every second, on the first section of the second | |
| 2154 | |
| 2155 | |
| 2156 // Tasks every 2 seconds, on the first section of the respective second. | |
| 2157 // Requests for tissue "fast forward" are executed immediately. | |
| 2158 if( ( sequence_timer == 0 ) | |
| 2159 || ( char_I_sim_advance_time > 0 ) | |
| 2160 ) | |
| 2161 { | |
| 2162 // Tissue and CNS updates are based on 2 seconds periods! | |
| 2163 | |
| 604 | 2164 // Set up normal tissue updating or "fast forward" updating for simulator |
| 2165 // sim+5' function and deco calculator bottom time calculation. | |
| 2166 if( char_I_sim_advance_time > 0 ) | |
| 2167 { | |
| 2168 // configure "fast forward" tissue updating | |
| 623 | 2169 tissue_increment = TISSUE_SELECTOR | char_I_sim_advance_time; |
| 2170 | |
| 2171 // clear the request | |
| 604 | 2172 char_I_sim_advance_time = 0; |
| 2173 } | |
| 2174 | |
| 584 | 2175 // calculate the real tissues |
| 2176 calc_tissues(); | |
| 2177 | |
| 604 | 2178 // update the CNS value for the real tissues |
| 2179 calc_CNS(); | |
| 2180 | |
| 2181 // calculate ceiling (at GF_high or 100%) and leading tissue supersaturation | |
| 623 | 2182 if ( char_I_deco_model ) calc_limit(GF_high); // GF factors enabled |
| 2183 else calc_limit( 1.0 ); // classic Buhlmann | |
| 2184 | |
| 2185 // convert the ceiling value to integer | |
| 604 | 2186 convert_ceiling_for_display(); |
| 2187 | |
| 623 | 2188 // convert the saturation value of the leading tissue to integer |
| 2189 convert_sat_for_display(); | |
| 2190 | |
| 2191 // convert the CNS value to integer | |
| 2192 convert_cur_CNS_for_display(); | |
| 2193 | |
| 2194 } // tasks every 2 seconds | |
| 2195 | |
| 2196 | |
| 2197 // Tasks every second, if more than 1 invocation per second: on the first section of the second. | |
| 2198 #if (INVOKES_PER_SECOND > 1) | |
| 2199 if( ( sequence_timer == 0 ) | |
| 2200 || ( sequence_timer == INVOKES_PER_SECOND ) | |
| 2201 ) | |
| 2202 #endif | |
| 582 | 2203 { |
| 623 | 2204 //---- Calculate and Export EAD and END ------------------------------------------------------ |
| 2205 | |
| 2206 // calculate EAD (Equivalent Air Depth): equivalent depth for the same N2 level with plain air | |
| 2207 EAD = (ppN2 / 0.7902 + ppWater - pres_surface) * BAR_TO_METER; | |
| 2208 | |
| 2209 // calculate END (Equivalent Narcotic Depth): here O2 is treated as narcotic, too | |
| 2210 // Source cited: The Physiology and Medicine of Diving by Peter Bennett and David Elliott, | |
| 2211 // 4th edition, 1993, W.B.Saunders Company Ltd, London. | |
| 2212 END = (real_pres_respiration - ppHe - pres_surface) * BAR_TO_METER; | |
| 2213 | |
| 2214 // export EAD | |
| 2215 float_value = EAD; convert_float_to_char(); char_O_EAD = char_value; | |
| 2216 | |
| 2217 // export END | |
| 2218 float_value = END; convert_float_to_char(); char_O_END = char_value; | |
| 2219 | |
| 2220 | |
| 2221 //---- Compute ppO2 Values in [cbar] --------------------------------------------------------- | |
| 2222 | |
| 2223 float_value = ppO2; convert_float_to_int(); int_O_breathed_ppO2 = int_value; // breathed gas | |
| 2224 #ifdef _ccr_pscr | |
| 2225 float_value = O2_ppO2; convert_float_to_int(); int_O_O2_ppO2 = int_value; // pure oxygen | |
| 2226 float_value = OC_ppO2; convert_float_to_int(); int_O_pure_ppO2 = int_value; // pure gas | |
| 2227 float_value = pSCR_ppO2; convert_float_to_int(); int_O_pSCR_ppO2 = int_value; // pSCR calculated | |
| 2228 #endif | |
| 2229 | |
| 2230 | |
| 628 | 2231 //---- Set/Clear Deco Mode ------------------------------------------------------------------ |
| 2232 | |
| 2233 // Clear the deco mode flag if: | |
| 2234 // deco mode is set | |
| 2235 // AND we are deeper than 7 meters below the deepest deco stop | |
| 2236 // (7 meters chosen as to be 2 stop depth intervals plus 1 additional meter below) | |
| 2237 if ( ( deco_info & DECO_MODE ) > 0 ) | |
| 2238 if ( ( char_depth_real ) > char_O_deco_depth[0] + 7 ) | |
| 2239 deco_info &= ~DECO_MODE; | |
| 623 | 2240 |
| 2241 // Set the deco mode flag if: | |
| 2242 // deco mode is not set | |
| 2243 // AND breathing an OC deco gas (gas type 3) | |
| 2244 // OR breathing a gas or diluent that officially is disabled (type 0) | |
| 628 | 2245 // OR there is a deco stop |
| 2246 if ( ( deco_info & DECO_MODE ) == 0 ) | |
| 2247 if ( ( char_I_current_gas_type == 3 ) | |
| 2248 || ( char_I_current_gas_type == 0 ) | |
| 2249 || ( char_O_deco_depth[0] > 0 ) | |
| 623 | 2250 ) |
| 628 | 2251 deco_info |= DECO_MODE; |
| 623 | 2252 |
| 2253 | |
| 2254 //---- Compute ppO2 Warnings ------------------------------------------------------------------ | |
| 2255 | |
| 628 | 2256 // compute conditional min value |
| 623 | 2257 #ifdef _ccr_pscr |
| 2258 int_ppO2_min = ( main_status & MODE_LOOP ) ? (unsigned short)char_I_ppO2_min_loop : (unsigned short)char_I_ppO2_min; | |
| 2259 #else | |
| 2260 int_ppO2_min = (unsigned short)char_I_ppO2_min; | |
| 2261 #endif | |
| 2262 | |
| 628 | 2263 // determine the absolute max value (should be the deco one, but who knows...) |
| 2264 int_ppO2_max_warn = ( char_I_ppO2_max_work > char_I_ppO2_max_deco) ? char_I_ppO2_max_work : char_I_ppO2_max_deco; | |
| 2265 | |
| 2266 // add some margin to compensate for surface pressures > 1.000 mbar | |
| 2267 int_ppO2_max_warn += ppO2_MARGIN_ON_MAX; | |
| 2268 | |
| 2269 // determine the normal max value | |
| 2270 int_ppO2_max_att = ( deco_info & DECO_MODE ) ? (unsigned short)char_I_ppO2_max_deco : (unsigned short)char_I_ppO2_max_work; | |
| 2271 | |
| 2272 // add some margin to compensate for surface pressures > 1.000 mbar | |
| 2273 int_ppO2_max_att += ppO2_MARGIN_ON_MAX; | |
| 623 | 2274 |
| 2275 #ifdef _ccr_pscr | |
| 628 | 2276 // default value for the upper diluent ppO2 warning threshold is the upper warning threshold |
| 2277 int_ppO2_max_dil = int_ppO2_max_warn; | |
| 2278 | |
| 2279 // when enabled and in CCR mode, the upper diluent warning threshold gets adjust according to the current setpoint | |
| 2280 if( char_I_dil_ppO2_check ) | |
| 623 | 2281 if( (main_status & MODE_MASK) == MODE_CCR ) |
| 2282 { | |
| 2283 overlay unsigned short max_dil; | |
| 2284 | |
| 2285 // The upper diluent ppO2 threshold is ppO2_GAP_TO_SETPOINT below the setpoint... | |
| 2286 // (the condition protects from negative numbers which would cause a wrap-around in unsigned integers) | |
| 2287 max_dil = (char_I_const_ppO2 > ppO2_GAP_TO_SETPOINT) ? (unsigned short)(char_I_const_ppO2 - ppO2_GAP_TO_SETPOINT) : 0; | |
| 2288 | |
| 628 | 2289 // ...but never above int_ppO2_max_warn |
| 2290 if( max_dil < int_ppO2_max_warn ) int_ppO2_max_dil = max_dil; | |
| 623 | 2291 |
| 2292 // We do not need to guard int_ppO2_max_dil against becoming lower than char_I_ppO2_min because the check | |
| 2293 // against char_I_ppO2_min is done first and will then raise a low warning and inhibit further checks. | |
| 2294 } | |
| 2295 #endif | |
| 2296 | |
| 2297 // check for safe range of breathed gas | |
| 628 | 2298 if ( int_O_breathed_ppO2 <= int_ppO2_min ) int_O_breathed_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; |
| 2299 else if ( int_O_breathed_ppO2 >= int_ppO2_max_warn ) int_O_breathed_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; | |
| 2300 else if ( deco_info & DECO_MODE ) ; // no attention generated in deco mode | |
| 2301 else if ( main_status & MODE_LOOP ) ; // no attention generated in loop modes | |
| 2302 else if ( int_O_breathed_ppO2 >= int_ppO2_max_att ) int_O_breathed_ppO2 |= INT_FLAG_ATTENTION; | |
| 623 | 2303 |
| 2304 #ifdef _ccr_pscr | |
| 2305 // check for safe range of pure oxygen | |
| 628 | 2306 if ( int_O_O2_ppO2 >= int_ppO2_max_warn ) int_O_O2_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; |
| 623 | 2307 |
| 2308 // check for safe range of pure diluent | |
| 628 | 2309 if ( int_O_pure_ppO2 <= (unsigned short)char_I_ppO2_min ) int_O_pure_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; |
| 2310 else if ( int_O_pure_ppO2 >= int_ppO2_max_warn ) int_O_pure_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; | |
| 2311 else if ( int_O_pure_ppO2 >= int_ppO2_max_dil ) int_O_pure_ppO2 |= INT_FLAG_ATTENTION; | |
| 623 | 2312 |
| 2313 // check for safe range of calculated pSCR loop gas | |
| 628 | 2314 if ( int_O_pSCR_ppO2 <= int_ppO2_min ) int_O_pSCR_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; |
| 2315 else if ( int_O_pSCR_ppO2 >= int_ppO2_max_warn ) int_O_pSCR_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; | |
| 623 | 2316 #endif |
| 2317 | |
| 2318 } // tasks every second / on the first section of the second | |
| 604 | 2319 |
| 2320 | |
| 2321 #ifdef _rx_functions | |
| 2322 | |
| 623 | 2323 // only when TR functions are enabled |
| 2324 if( main_status & TR_FUNCTIONS ) | |
| 2325 | |
| 2326 // Tasks every second, if more than 1 invocation per second: on the second section of the second. | |
| 2327 #if (INVOKES_PER_SECOND > 1) | |
| 2328 if( ( sequence_timer == 1 ) | |
| 2329 || ( sequence_timer == INVOKES_PER_SECOND + 1 ) | |
| 2330 ) | |
| 2331 #endif | |
| 604 | 2332 { |
| 623 | 2333 calc_TR_functions(); |
| 2334 } | |
| 2335 | |
| 2336 #endif // _rx_functions | |
| 2337 | |
| 2338 | |
| 2339 // | |
| 604 | 2340 //---- End of Computations for the real Tissues ----------------------------------------------- |
| 2341 // | |
| 623 | 2342 |
| 604 | 2343 //============================================================================================= |
| 623 | 2344 |
| 604 | 2345 // |
| 623 | 2346 //---- Begin of Computations for Ascent and Decompression (simulated Tissues) ----------------- |
| 2347 // | |
| 2348 | |
| 2349 // Dispatcher: select what to do based on the current calculation phase | |
| 2350 do | |
| 582 | 2351 { |
| 623 | 2352 |
| 2353 #ifdef _profiling | |
| 2354 profiling_phase = next_planning_phase; | |
| 2355 #endif | |
| 2356 | |
| 2357 switch( next_planning_phase ) | |
| 560 | 2358 { |
| 623 | 2359 |
| 2360 // | |
| 2361 //---- once-per-dive Initialization of the Deco Engine ------------------------------------ | |
| 2362 // | |
| 2363 case PHASE_10_DIVE_INIT: | |
| 2364 | |
| 2365 // initialize all output variables to defaults | |
| 2366 init_output_vars(); | |
| 2367 | |
| 2368 // safeguard input parameters that are constant during the course of the dive | |
| 2369 if( char_I_ascent_speed < 5 ) char_I_ascent_speed = 5; | |
| 2370 if( char_I_ascent_speed > 10 ) char_I_ascent_speed = 10; | |
| 2371 | |
| 2372 // convert input parameters to float numbers | |
| 2373 float_ascent_speed = 1.00 * char_I_ascent_speed; | |
| 582 | 2374 |
| 628 | 2375 |
| 582 | 2376 // initialize values that will be recalculated later on periodically |
| 623 | 2377 deco_warnings = 0; // reset all deco warnings |
| 2378 deco_info = 0; // reset all deco infos | |
| 2379 IBCD_tissue_vector = 0; // reset tissue IBCD vector | |
| 2380 NDL_tissue_start_norm = 0; // initialize the tissue to start with when calculating normal NDL time | |
| 2381 NDL_tissue_start_alt = 0; // initialize the tissue to start with when calculating alternative NDL time | |
| 2382 | |
| 2383 // enforce initialization of GF data on first cyclic initialization | |
| 628 | 2384 GF_high_last = 255; |
| 2385 GF_low_last = 255; | |
| 2386 | |
| 2387 #ifdef _gas_contingency | |
| 2388 // shall check for gas pan out? | |
| 2389 if( char_I_gas_contingency ) | |
| 2390 { | |
| 2391 overlay float reduction = 0.5 * (float)char_I_SAC_deco * (1.0 + (float)char_I_depth_last_deco / 10.0); | |
| 2392 | |
| 2393 // YES - calculate volumes available for each gas | |
| 2394 for( i = 0; i < NUM_GAS; i++ ) | |
| 2395 { | |
| 2396 // total available volume = tank size * fill press, char_I_gas_avail_pres is in multiples of 10 bar | |
| 2397 gas_volume_avail[i] = (float)char_I_gas_avail_size[i] * (float)char_I_gas_avail_pres[i] * 10.0; | |
| 2398 | |
| 2399 // reduce total available volumes by due for 1/2 minute on last stop | |
| 2400 gas_volume_avail[i] -= reduction; | |
| 2401 } | |
| 2402 } | |
| 2403 #endif | |
| 623 | 2404 |
| 2405 #ifdef _cave_mode | |
| 2406 char_I_backtrack_time = 0; //clear backtracking time (index to char_I_backtrack_depth) | |
| 2407 char_I_backtrack_depth = 0; //prime first entry with a depth of 0 meter | |
| 2408 #endif | |
| 2409 | |
| 2410 #ifdef _profiling | |
| 2411 int_O_profiling_overrun_max = 0; | |
| 2412 char_O_profiling_runs_norm = 0; | |
| 2413 char_O_profiling_runs_alt = 0; | |
| 2414 #endif | |
| 2415 | |
| 2416 | |
| 2417 // the next calculation phase will do the cyclic initialization of the deco engine if a | |
| 2418 // normal or alternative plan shall be calculated, else the calculation cycle is done. | |
| 628 | 2419 if( deco_status & PLAN_MASK ) next_planning_phase = PHASE_20_CYCLIC_INIT; |
| 623 | 2420 else next_planning_phase = PHASE_00_DONE; |
| 2421 | |
| 2422 break; | |
| 2423 | |
| 582 | 2424 |
| 2425 // | |
| 628 | 2426 //---- once-per-cycle Initialization of the Deco Engine ----------------------------------- |
| 582 | 2427 // |
| 628 | 2428 case PHASE_20_CYCLIC_INIT: |
| 623 | 2429 |
| 2430 // target the simulated tissues (flag bit 7 = 0) | |
| 2431 tissue_increment = 0; | |
| 2432 | |
| 2433 // clear the internal stops table | |
| 582 | 2434 clear_deco_table(); |
| 604 | 2435 |
| 560 | 2436 // initialize the simulated tissues with the current state of the real tissues |
| 604 | 2437 for( i = 0; i < NUM_COMP; i++ ) |
| 560 | 2438 { |
| 623 | 2439 sim_pres_tissue_N2[i] = real_pres_tissue_N2[i]; |
| 2440 sim_pres_tissue_He[i] = real_pres_tissue_He[i]; | |
| 582 | 2441 } |
| 2442 | |
| 623 | 2443 // initialize GF parameters if using GF model |
| 2444 if( char_I_deco_model != 0 ) | |
| 604 | 2445 { |
| 623 | 2446 // update GF parameters (GFs may have been switched between GF and aGF) |
| 628 | 2447 if( (char_I_GF_Low_percentage != GF_low_last) || (char_I_GF_High_percentage != GF_high_last) ) |
| 604 | 2448 { |
| 623 | 2449 // store new values in integer format |
| 628 | 2450 GF_low_last = char_I_GF_Low_percentage; |
| 623 | 2451 GF_high_last = char_I_GF_High_percentage; |
| 628 | 2452 |
| 2453 // safeguard and store new values in float format | |
| 2454 GF_low = ( GF_low_last > 10 ) ? 0.01 * GF_low_last : 0.10 ; | |
| 2455 GF_high = ( GF_high_last > GF_low_last ) ? 0.01 * GF_high_last : GF_low; | |
| 2456 | |
| 623 | 2457 |
| 2458 // reset low depth references and slopes | |
| 2459 GF_low_depth_norm = 0; | |
| 2460 GF_low_depth_alt = 0; | |
| 2461 GF_slope_norm = 0.0; | |
| 2462 GF_slope_alt = 0.0; | |
| 604 | 2463 } |
| 623 | 2464 |
| 2465 // retrieve GF parameters for current calculation cycle | |
| 2466 if( deco_status & CALC_NORM ) | |
| 560 | 2467 { |
| 623 | 2468 GF_low_depth = GF_low_depth_norm; |
| 2469 GF_slope = GF_slope_norm; | |
| 560 | 2470 } |
| 2471 else | |
| 2472 { | |
| 623 | 2473 GF_low_depth = GF_low_depth_alt; |
| 2474 GF_slope = GF_slope_alt; | |
| 560 | 2475 } |
| 604 | 2476 } |
| 2477 | |
| 623 | 2478 // initialize the simulated CNS value with the current CNS value of the real tissues |
| 2479 CNS_fraction_sim = CNS_fraction_real; | |
| 2480 | |
| 628 | 2481 // initialize the simulated depth with the current depth, |
| 2482 // memorize current depth as start depth of the simulation | |
| 623 | 2483 sim_pres_respiration = real_pres_respiration; |
| 628 | 2484 char_depth_sim = char_depth_real; |
| 2485 char_depth_sim_start = char_depth_real; | |
| 623 | 2486 |
| 2487 // Lookup the gas that is currently breathed with the real tissues and set it as | |
| 2488 // the gas to be used with the simulated tissues, too. This gas will be used until | |
| 628 | 2489 // gas_find_best()/gas_take_best() is invoked and switches to a better gas. |
| 2490 gas_take_current(); | |
| 2491 | |
| 2492 // Setup the calculation ratio's for N2, He and O2 (sim_N2/He/_O2_ratio). | |
| 2493 // These ratios can be kept until a gas switch is done. Thus, if a call to | |
| 2494 // gas_find_best() has found a better gas and this gas is taken by a call | |
| 2495 // to gas_take_best(), gas_set_ratios() needs to be called again. | |
| 623 | 2496 gas_set_ratios(); |
| 2497 | |
| 2498 // compute ppO2, ppN2 and ppHe for current depth from sim_pres_respiration | |
| 2499 calc_alveolar_pressures(); | |
| 2500 | |
| 2501 // initialize the no decompression limit (NDL) time to 240 minutes | |
| 2502 NDL_time = 240; | |
| 2503 | |
| 628 | 2504 // initialize the total ascent time to 0 minutes |
| 2505 ascent_time = 0; | |
| 2506 | |
| 623 | 2507 // retrieve the tissue that had the shortest NDL time during last calculation |
| 2508 NDL_tissue_start = ( deco_status & CALC_NORM ) ? NDL_tissue_start_norm : NDL_tissue_start_alt; | |
| 2509 | |
| 2510 // start calculating NDL time with the tissue that had the shortest NDL last time | |
| 2511 NDL_tissue = NDL_tissue_start; | |
| 2512 NDL_tissue_lead = NDL_tissue_start; | |
| 2513 | |
| 2514 // initialization for calculating the initial ascent | |
| 2515 // start with 1 minute ascent steps when calculating the initial ascent | |
| 2516 fast = 1; | |
| 2517 | |
| 2518 // initialization for convert_gas_needs_to_press() | |
| 2519 gas_needs_gas_index = 0; | |
| 2520 | |
| 628 | 2521 // shall calculate gas needs? |
| 2522 if( main_status & CALC_VOLUME ) | |
| 2523 { | |
| 2524 // set the usage rate (SAC rate), starting with working part of the dive | |
| 2525 gas_needs_usage_rate = char_I_SAC_work; | |
| 2526 | |
| 2527 // clear the gas volume needs for gases 1-5 | |
| 2528 for( i = 0; i < NUM_GAS; ++i ) gas_volume_need[i] = 0.0; | |
| 2529 | |
| 2530 #ifdef _rx_functions | |
| 2531 // only for OSTC TR model with TR functions enabled | |
| 2532 if( main_status & TR_FUNCTIONS ) | |
| 2533 { | |
| 2534 // invalidate pressure needs to pressure readings | |
| 2535 int_O_pressure_need[0] = 0 + INT_FLAG_NOT_AVAIL; | |
| 2536 int_O_pressure_need[1] = 0 + INT_FLAG_NOT_AVAIL; | |
| 2537 } | |
| 2538 #endif | |
| 2539 } | |
| 623 | 2540 |
| 2541 #ifdef _profiling | |
| 2542 profiling_runs = 0; | |
| 2543 #endif | |
| 2544 | |
| 2545 // The next calculation phase will | |
| 628 | 2546 // - calculate the extended bottom segment if extended bottom time is configured (fTTS), |
| 2547 // - calculate the bottom segment gas need if gas needs calculation is configured, | |
| 623 | 2548 // - proceed with calculating the NDL time else. |
| 628 | 2549 if ( deco_status & DELAYED_ASCENT ) next_planning_phase = PHASE_30_EXTENDED_BOTTOM_TIME; |
| 2550 else if ( main_status & CALC_VOLUME ) next_planning_phase = PHASE_40_BOTTOM_GAS_NEED; | |
| 2551 else next_planning_phase = PHASE_50_NDL_TIME; | |
| 623 | 2552 |
| 2553 break; | |
| 2554 | |
| 2555 | |
| 2556 // | |
| 2557 //---- extended Bottom Time --------------------------------------------------------------- | |
| 2558 // | |
| 628 | 2559 case PHASE_30_EXTENDED_BOTTOM_TIME: |
| 623 | 2560 |
| 2561 // program interval on simulated tissues (flag bit 7 = 0) | |
| 2562 tissue_increment = char_I_extra_time; | |
| 2563 | |
| 628 | 2564 // update the simulated tissues for tissue_increment (char_I_extra_time) minutes at depth, |
| 2565 // calc_alveolar_pressures() has already been called in cyclic initialization | |
| 623 | 2566 calc_tissues(); |
| 2567 | |
| 628 | 2568 // update the CNS value for tissue_increment (char_I_extra_time) minutes at depth |
| 623 | 2569 calc_CNS(); |
| 2570 | |
| 628 | 2571 // the next calculation phase will |
| 2572 // - calculate the extended bottom segment gas needs if gas needs calculation is configured, | |
| 2573 // - proceed with calculating the NDL time else. | |
| 2574 if ( main_status & CALC_VOLUME ) next_planning_phase = PHASE_40_BOTTOM_GAS_NEED; | |
| 2575 else next_planning_phase = PHASE_50_NDL_TIME; | |
| 2576 | |
| 2577 break; | |
| 2578 | |
| 2579 | |
| 2580 // | |
| 2581 //---- Bottom Segment Gas Need ------------------------------------------------------------ | |
| 2582 // | |
| 2583 case PHASE_40_BOTTOM_GAS_NEED: | |
| 2584 | |
| 2585 // on gas 1-5 ? | |
| 2586 if( sim_gas_current_num ) | |
| 2587 { | |
| 2588 // YES - set the bottom depth | |
| 2589 gas_needs_depth = char_depth_sim_start; | |
| 2590 | |
| 2591 // take either the whole bottom time or just the fTTS/bailout extra time | |
| 2592 gas_needs_time = ( main_status & CALCULATE_BOTTOM ) ? char_I_bottom_time : char_I_extra_time; | |
| 2593 | |
| 2594 // calculate gas demand | |
| 2595 calc_due_by_depth_time_sac(); | |
| 2596 | |
| 2597 // take the result | |
| 2598 gas_volume_need[sim_gas_current_num-1] = gas_needs_volume_due; | |
| 2599 } | |
| 2600 | |
| 2601 | |
| 623 | 2602 // the next calculation phase will calculate the NDL time |
| 628 | 2603 next_planning_phase = PHASE_50_NDL_TIME; |
| 604 | 2604 |
| 582 | 2605 break; |
| 2606 | |
| 623 | 2607 |
| 2608 // | |
| 2609 //---- NDL Time --------------------------------------------------------------------------- | |
| 2610 // | |
| 628 | 2611 case PHASE_50_NDL_TIME: |
| 623 | 2612 |
| 2613 // Calculate the remaining no decompression limit (NDL) time for the tissue NDL_tissue. | |
| 2614 // NDL_time will be updated if the NDL time found is shorter than the current NDL_time. | |
| 2615 // | |
| 2616 // In the initialization phase of the calculation cycle: | |
| 2617 // - NDL_time had been initialized to 240 (minutes), | |
| 2618 // - NDL_tissue had been initialized to the tissue with | |
| 2619 // the shortest NDL time in the last cycle. | |
| 2620 // | |
| 2621 calc_NDL_time_tissue(); | |
| 2622 | |
| 2623 // advance to next tissue, wrapping around after last tissue | |
| 2624 NDL_tissue = (NDL_tissue + 1) & (NUM_COMP - 1); | |
| 2625 | |
| 2626 // did we run out of NDL time or did we have probed all tissues? | |
| 2627 if( (NDL_time == 0) || (NDL_tissue == NDL_tissue_start) ) | |
| 2628 { | |
| 2629 // YES | |
| 2630 | |
| 2631 // set the tissue with the shortest NDL time found as | |
| 2632 // the one to start with in the next calculation cycle | |
| 2633 if( deco_status & CALC_NORM ) NDL_tissue_start_norm = NDL_tissue_lead; | |
| 2634 else NDL_tissue_start_alt = NDL_tissue_lead; | |
| 2635 | |
| 2636 // done with calculating NDL time, set next calculation phase: | |
| 2637 // - calculate return and ascent in cave mode if configured, else | |
| 628 | 2638 // - proceed with no-stop ascent if within NDL time, or |
| 2639 // - proceed with deco ascent if beyond NDL time. | |
| 623 | 2640 #ifdef _cave_mode |
| 628 | 2641 if ( main_status & CAVE_MODE ) next_planning_phase = PHASE_60_CAVE_RETURN; |
| 623 | 2642 else |
| 2643 #endif | |
| 628 | 2644 next_planning_phase = PHASE_70_OPEN_WATER_ASCENT; |
| 623 | 2645 } |
| 2646 | |
| 2647 break; | |
| 2648 | |
| 2649 | |
| 2650 #ifdef _cave_mode | |
| 2651 // | |
| 628 | 2652 //---- Cave Mode Return ------------------------------------------------------------------- |
| 560 | 2653 // |
| 628 | 2654 case PHASE_60_CAVE_RETURN: |
| 623 | 2655 |
| 2656 // TODO | |
| 2657 | |
| 2658 // the next calculation phase will gather all results | |
| 628 | 2659 next_planning_phase = PHASE_80_RESULTS; |
| 623 | 2660 |
| 2661 break; | |
| 2662 #endif | |
| 2663 | |
| 2664 | |
| 560 | 2665 // |
| 628 | 2666 //---- Open Water Ascent ------------------------------------------------------------------ |
| 560 | 2667 // |
| 628 | 2668 case PHASE_70_OPEN_WATER_ASCENT: |
| 623 | 2669 |
| 2670 // program 1 minute interval on simulated tissues | |
| 2671 tissue_increment = 1; | |
| 2672 | |
| 628 | 2673 // memorize current gas in case there will be a gas change |
| 2674 sim_gas_last_num = sim_gas_current_num; | |
| 2675 | |
| 2676 // find_next_stop(): | |
| 2677 // stays at the current stop depth, ascents to the next stop depth, or | |
| 2678 // ascents to the depth that is reachable within one minute of ascent | |
| 2679 // without needing to stop. | |
| 2680 // | |
| 2681 // return value : 1/true if a stop is required, else 0/false | |
| 2682 // char_depth_sim : current depth (depth achieved) | |
| 2683 // char_depth_last : last depth (depth we came from) | |
| 2684 // | |
| 623 | 2685 if( find_next_stop() ) |
| 560 | 2686 { |
| 628 | 2687 overlay unsigned char silent_stop = 0; |
| 2688 overlay unsigned char gas_change = 0; | |
| 2689 | |
| 623 | 2690 //---- stop required -------------------- |
| 2691 | |
| 2692 // check if there is a better gas to switch to | |
| 628 | 2693 if( gas_find_best() ) |
| 623 | 2694 { |
| 628 | 2695 // YES - memorize it |
| 2696 gas_change = 1; | |
| 2697 | |
| 2698 // take the gas | |
| 2699 gas_take_best(); | |
| 2700 | |
| 623 | 2701 // set the new calculation ratios for N2, He and O2 |
| 2702 gas_set_ratios(); | |
| 2703 | |
| 628 | 2704 // add the gas change time to the stop time |
| 2705 tissue_increment += char_I_gas_change_time; | |
| 2706 | |
| 2707 // extended stops option enabled and | |
| 2708 // gas change depth deeper than the current depth ? | |
| 2709 if( main_status & EXTENDED_STOPS ) | |
| 2710 if( sim_gas_current_depth > char_depth_sim ) | |
| 623 | 2711 { |
| 628 | 2712 // YES - make a "silent" stop at the gas change depth |
| 2713 // to figure in the gas change | |
| 2714 silent_stop = 1; | |
| 2715 | |
| 2716 // locate the stop at the shallower one of the | |
| 2717 // gas change depth or the depth we came from | |
| 2718 char_depth_sim = (sim_gas_current_depth < char_depth_last) ? | |
| 2719 sim_gas_current_depth : char_depth_last; | |
| 2720 | |
| 2721 // calculate sim_pres_respiration for | |
| 2722 // the adjusted value of char_depth_sim | |
| 2723 calc_sim_pres_respiration(); | |
| 2724 | |
| 2725 // as we didn't travel the full distance, | |
| 2726 // account for the gas change time only | |
| 2727 tissue_increment = char_I_gas_change_time; | |
| 2728 | |
| 2729 // if run from the deco calculator, | |
| 2730 // put the gas change into the stops table or | |
| 2731 // abort deco calculation if the table is full | |
| 2732 if( deco_status & DECO_CALCULATOR_MODE ) | |
| 2733 if( !update_deco_table(tissue_increment) ) | |
| 2734 next_planning_phase = PHASE_80_RESULTS; | |
| 623 | 2735 } |
| 628 | 2736 } // better gas |
| 2737 | |
| 2738 | |
| 2739 // if the stop is not a silent one, | |
| 2740 // add the stop to an existing stop or add a new stop, | |
| 2741 // or abort deco calculation if the deco table is full | |
| 2742 if( !silent_stop ) | |
| 2743 if( !update_deco_table(tissue_increment) ) | |
| 2744 next_planning_phase = PHASE_80_RESULTS; | |
| 2745 | |
| 2746 | |
| 2747 // shall calculate gas needs? | |
| 2748 if( main_status & CALC_VOLUME ) | |
| 2749 { | |
| 2750 // encountered a stop, so switch to deco usage rate (SAC deco) | |
| 2751 gas_needs_usage_rate = char_I_SAC_deco; | |
| 2752 | |
| 2753 // set the depth for gas need calculation to the shallower one | |
| 2754 // of the start depth (current real depth) and the stop depth | |
| 2755 // (assumed depth to be) as we may be shallower than we should be | |
| 2756 gas_needs_depth = ( char_depth_sim_start < char_depth_sim ) ? | |
| 2757 char_depth_sim_start : char_depth_sim; | |
| 2758 | |
| 2759 // did a gas change occur and last gas is 1-5 and a gas change time set? | |
| 2760 if( gas_change && sim_gas_last_num && char_I_gas_change_time ) | |
| 2761 { | |
| 2762 // YES - set time it takes for switching the gas | |
| 2763 gas_needs_time = char_I_gas_change_time; | |
| 2764 | |
| 2765 // calculate gas demand | |
| 2766 calc_due_by_depth_time_sac(); | |
| 2767 | |
| 2768 // add the demand to the overall demand on the last gas | |
| 2769 gas_volume_need[sim_gas_last_num-1] += gas_needs_volume_due; | |
| 2770 } | |
| 2771 | |
| 2772 // current gas is 1-5 ? | |
| 2773 if( sim_gas_current_num ) | |
| 2774 { | |
| 2775 // YES - time is 1 minute plus the gas change time (if set) | |
| 2776 gas_needs_time = tissue_increment; | |
| 2777 | |
| 2778 // calculate gas demand | |
| 2779 calc_due_by_depth_time_sac(); | |
| 2780 | |
| 2781 // add the demand to the overall demand on the current gas | |
| 2782 gas_volume_need[sim_gas_current_num-1] += gas_needs_volume_due; | |
| 2783 } | |
| 2784 } // gas need | |
| 560 | 2785 } |
| 2786 else | |
| 2787 { | |
| 623 | 2788 //---- no stop required ----------------- |
| 2789 | |
| 628 | 2790 // switch to a better gas, but only: |
| 623 | 2791 // |
| 628 | 2792 // if extended stops are activated OR if in bailout OR if within NDL |
| 2793 // AND if the actual depth is below (deeper) or at the change depth of the | |
| 2794 // better gas (switch depth has not been passed yet) | |
| 2795 // AND if the depth of the last stop is above (shallower) or at the change | |
| 2796 // depth of the better gas (do not switch on final ascent) | |
| 623 | 2797 // |
| 628 | 2798 // Attention: do not use a && formula over all 'if' terms, the |
| 2799 // conditions need to be evaluated in the given order! | |
| 623 | 2800 // |
| 628 | 2801 if( (main_status & EXTENDED_STOPS) || (deco_status & BAILOUT_MODE) || NDL_time ) |
| 2802 if( gas_find_best() ) | |
| 2803 if( char_depth_real >= sim_gas_best_depth ) | |
| 2804 if( char_I_depth_last_deco <= sim_gas_best_depth ) | |
| 560 | 2805 { |
| 628 | 2806 // YES - take the gas |
| 2807 gas_take_best(); | |
| 2808 | |
| 623 | 2809 // set the new calculation values for N2, He and O2 |
| 2810 gas_set_ratios(); | |
| 2811 | |
| 628 | 2812 // set char_depth_sim to the gas change depth |
| 2813 char_depth_sim = sim_gas_current_depth; | |
| 2814 | |
| 2815 // calculate sim_pres_respiration for | |
| 2816 // the adjusted value of char_depth_sim | |
| 2817 calc_sim_pres_respiration(); | |
| 2818 | |
| 2819 // as we didn't travel the full distance, | |
| 2820 // account for the gas change time only | |
| 2821 tissue_increment = char_I_gas_change_time; | |
| 2822 | |
| 2823 // if in deco and | |
| 2824 // if run from the deco calculator: | |
| 2825 // create a stop for the gas change in the stops table, | |
| 2826 // abort deco calculation if the deco table is full | |
| 2827 if( !NDL_time ) | |
| 2828 if( deco_status & DECO_CALCULATOR_MODE ) | |
| 2829 if( !update_deco_table(tissue_increment) ) | |
| 2830 next_planning_phase = PHASE_80_RESULTS; | |
| 2831 | |
| 2832 // shall calculate gas needs and gas change time is set? | |
| 2833 if( main_status & CALC_VOLUME ) | |
| 2834 if( char_I_gas_change_time ) | |
| 2835 { | |
| 2836 // YES - set depth to current depth | |
| 2837 gas_needs_depth = char_depth_sim; | |
| 2838 | |
| 2839 // set time it takes for switching the gas | |
| 2840 gas_needs_time = tissue_increment; | |
| 2841 | |
| 2842 // calculate gas demand | |
| 2843 calc_due_by_depth_time_sac(); | |
| 2844 | |
| 2845 // add gas demand to the overall demand on the new gas | |
| 2846 gas_volume_need[sim_gas_current_num-1] += gas_needs_volume_due; | |
| 2847 | |
| 2848 // was the last gas one of the gases 1-5 ? | |
| 2849 if( sim_gas_last_num ) | |
| 2850 { | |
| 2851 // YES - add the same demand to the overall demand on the last gas | |
| 2852 gas_volume_need[sim_gas_last_num-1] += gas_needs_volume_due; | |
| 2853 } | |
| 2854 } // gas switching needs | |
| 2855 } // gas switch | |
| 2856 | |
| 2857 // shall calculate gas needs and | |
| 2858 // last (or still current) gas is 1-5 ? | |
| 2859 if( main_status & CALC_VOLUME ) | |
| 2860 if( sim_gas_last_num ) | |
| 2861 { | |
| 2862 // YES - compute distance traveled | |
| 2863 gas_needs_depth = char_depth_last - char_depth_sim; | |
| 2864 | |
| 2865 // at least some positive distance traveled? | |
| 2866 if( gas_needs_depth > 1 ) | |
| 2867 { | |
| 2868 // YES - set depth to average depth along the distance | |
| 2869 gas_needs_depth += 1; | |
| 2870 gas_needs_depth /= 2; | |
| 2871 gas_needs_depth += char_depth_sim; | |
| 2872 | |
| 2873 // ascent time is 1 minute | |
| 2874 gas_needs_time = 1; | |
| 2875 | |
| 2876 // calculate gas demand | |
| 2877 calc_due_by_depth_time_sac(); | |
| 2878 | |
| 2879 // add to overall demand | |
| 2880 gas_volume_need[sim_gas_last_num-1] += gas_needs_volume_due; | |
| 2881 } | |
| 2882 } // gas travel needs | |
| 2883 | |
| 2884 } // stop / no stop | |
| 2885 | |
| 2886 // --- one or more minutes have passed by now --- | |
| 2887 | |
| 2888 // update the ascent time | |
| 2889 ascent_time += tissue_increment; | |
| 582 | 2890 |
| 604 | 2891 // compute current ppO2, ppN2 and ppHe |
| 582 | 2892 calc_alveolar_pressures(); |
| 2893 | |
| 560 | 2894 // update the tissues |
| 582 | 2895 calc_tissues(); |
| 604 | 2896 |
| 2897 // update the CNS value | |
| 2898 calc_CNS(); | |
| 623 | 2899 |
| 2900 // finish stops calculation if the surface is reached | |
| 628 | 2901 if( char_depth_sim == 0 ) next_planning_phase = PHASE_80_RESULTS; |
| 623 | 2902 |
| 2903 break; | |
| 2904 | |
| 2905 | |
| 2906 /// | |
| 2907 //--- Results - Initialization ------------------------------------------------------------ | |
| 2908 // | |
| 628 | 2909 case PHASE_80_RESULTS: |
| 2910 | |
| 2911 // convert the CNS value to integer | |
| 2912 convert_sim_CNS_for_display(); | |
| 2913 | |
| 2914 if( deco_status & CALC_NORM ) | |
| 2915 { | |
| 2916 // export the integer CNS value | |
| 2917 int_O_CNS_norm = int_sim_CNS_fraction; | |
| 2918 } | |
| 2919 else | |
| 2920 { | |
| 2921 // export the integer CNS value | |
| 2922 int_O_CNS_alt = int_sim_CNS_fraction; | |
| 2923 } | |
| 623 | 2924 |
| 2925 // The next calculation phase will | |
| 2926 // - publish the stops table if in normal plan mode, | |
| 2927 // - proceed with remaining results dependent on if within NDL, or | |
| 2928 // - in deco | |
| 628 | 2929 if ( deco_status & CALC_NORM ) next_planning_phase = PHASE_81_RESULTS_STOPS_TABLE; |
| 2930 else if ( NDL_time ) next_planning_phase = PHASE_82_RESULTS_NDL; | |
| 2931 else next_planning_phase = PHASE_83_RESULTS_DECO; | |
| 623 | 2932 |
| 2933 break; | |
| 2934 | |
| 2935 | |
| 2936 /// | |
| 2937 //--- Publish Stops Table ----------------------------------------------------------------- | |
| 2938 // | |
| 628 | 2939 case PHASE_81_RESULTS_STOPS_TABLE: |
| 623 | 2940 |
| 2941 // publish the stops table to the display functions | |
| 2942 publish_deco_table(); | |
| 2943 | |
| 2944 // When entering deco and the ceiling depth becomes > 0 but the | |
| 2945 // deco calculation reveals no distinct deco stop yet because | |
| 2946 // the deco obligation will vanish during the ascent, create an | |
| 2947 // artificial stop to signal that expedite surfacing ("popping | |
| 2948 // up") is not allowed anymore. | |
| 2949 if( char_O_deco_depth[0] == 0 ) // simulated ascent reveals no required stops | |
| 2950 if( int_O_ceiling > 0 ) // real tissues have a ceiling | |
| 2951 { | |
| 2952 // set a pro forma stop at the configured last stop depth | |
| 2953 char_O_deco_depth[0] = char_I_depth_last_deco; | |
| 2954 | |
| 2955 // set a stop time of 0 minutes, this will be displayed as "..'" | |
| 2956 char_O_deco_time[0] = 0; | |
| 2957 } | |
| 2958 | |
| 2959 // update deco info vector | |
| 628 | 2960 if( char_O_deco_depth[0] ) deco_info |= DECO_STOPS; // set flag for deco stops found |
| 623 | 2961 else deco_info &= ~DECO_STOPS; // clear flag for deco stops found |
| 2962 | |
| 2963 // The next calculation phase will publish the main results dependent on being | |
| 2964 // - within NDL, | |
| 2965 // - in deco. | |
| 628 | 2966 if ( NDL_time ) next_planning_phase = PHASE_82_RESULTS_NDL; |
| 2967 else next_planning_phase = PHASE_83_RESULTS_DECO; | |
| 623 | 2968 |
| 2969 break; | |
| 2970 | |
| 2971 | |
| 2972 /// | |
| 2973 //--- Results - within NDL ---------------------------------------------------------------- | |
| 2974 // | |
| 628 | 2975 case PHASE_82_RESULTS_NDL: |
| 623 | 2976 |
| 2977 // results to publish depend on normal or alternative plan | |
| 2978 if( deco_status & CALC_NORM ) | |
| 2979 { | |
| 2980 // output the NDL time | |
| 2981 char_O_NDL_norm = NDL_time; | |
| 2982 | |
| 2983 // clear the normal ascent time | |
| 2984 int_O_TTS_norm = 0; | |
| 2985 } | |
| 2986 else | |
| 2987 { | |
| 2988 // output the NDL time | |
| 2989 char_O_NDL_alt = NDL_time; | |
| 2990 | |
| 2991 // clear the alternative ascent time | |
| 2992 int_O_TTS_alt = 0; | |
| 2993 } | |
| 2994 | |
| 2995 // The next calculation phase will | |
| 2996 // - finish the calculation cycle if no gas needs calculation configured, else | |
| 628 | 2997 // - calculate the gas needs pressures |
| 623 | 2998 if ( !(main_status & CALC_VOLUME ) ) next_planning_phase = PHASE_90_FINISH; |
| 628 | 2999 else next_planning_phase = PHASE_84_GAS_NEEDS_PRESSURES; |
| 623 | 3000 |
| 3001 break; | |
| 3002 | |
| 3003 | |
| 3004 /// | |
| 3005 //--- Results - in Deco ------------------------------------------------------------------- | |
| 3006 // | |
| 628 | 3007 case PHASE_83_RESULTS_DECO: |
| 3008 | |
| 3009 // limit ascent time to display max. | |
| 3010 if( ascent_time > 999) ascent_time = 999; | |
| 3011 | |
| 3012 // tag ascent time as invalid if there is an overflow in the stops table | |
| 3013 if( deco_warnings & DECO_WARNING_INCOMPLETE ) ascent_time |= INT_FLAG_INVALID; | |
| 623 | 3014 |
| 3015 // results to publish depend on normal or alternative plan | |
| 3016 if( deco_status & CALC_NORM ) | |
| 3017 { | |
| 3018 // clear the normal NDL time | |
| 3019 char_O_NDL_norm = 0; | |
| 3020 | |
| 3021 // export the ascent time | |
| 3022 int_O_TTS_norm = ascent_time; | |
| 3023 } | |
| 3024 else | |
| 3025 { | |
| 3026 // clear the alternative NDL time | |
| 3027 char_O_NDL_alt = 0; | |
| 3028 | |
| 3029 // export the ascent time | |
| 3030 int_O_TTS_alt = ascent_time; | |
| 3031 } | |
| 3032 | |
| 3033 // The next calculation phase will | |
| 3034 // - finish the calculation cycle if no gas needs calculation configured, else | |
| 3035 // - calculate the gas needs along the ascent | |
| 3036 if ( !(main_status & CALC_VOLUME ) ) next_planning_phase = PHASE_90_FINISH; | |
| 628 | 3037 else next_planning_phase = PHASE_84_GAS_NEEDS_PRESSURES; |
| 623 | 3038 |
| 3039 break; | |
| 3040 | |
| 3041 | |
| 3042 // | |
| 628 | 3043 //--- Results - convert Gas Needs Volumes to Pressures ------------------------------------ |
| 623 | 3044 // |
| 628 | 3045 case PHASE_84_GAS_NEEDS_PRESSURES: |
| 623 | 3046 |
| 3047 // convert required volume of the gas pointed to by gas_needs_gas_index | |
| 3048 // into the respective pressure and set the flags | |
| 3049 convert_gas_needs_to_press(); | |
| 3050 | |
| 3051 // increment index to address next gas | |
| 3052 gas_needs_gas_index++; | |
| 3053 | |
| 3054 // if all gases have been converted, advance to next calculation phase | |
| 3055 if( gas_needs_gas_index == NUM_GAS ) next_planning_phase = PHASE_90_FINISH; | |
| 3056 | |
| 3057 break; | |
| 3058 | |
| 3059 | |
| 3060 // | |
| 3061 //--- finish Calculation Cycle ------------------------------------------------------------ | |
| 3062 // | |
| 3063 case PHASE_90_FINISH: | |
| 3064 | |
| 3065 // Check if deco obligation is steady state or decreasing. | |
| 3066 // This works only when an alternative plan is enabled and if it is not a bailout plan, | |
| 3067 // thus BAILOUT_MODE must not be set while doing the alternative plan. | |
| 3068 if( (deco_status & CALC_ALT) && !(deco_status & BAILOUT_MODE) ) | |
| 3069 { | |
| 628 | 3070 if( int_O_TTS_alt < int_O_TTS_norm ) deco_info |= DECO_ZONE; |
| 3071 if( int_O_TTS_alt > int_O_TTS_norm ) deco_info &= ~DECO_ZONE; | |
| 623 | 3072 } |
| 3073 | |
| 3074 // export updated deco infos and warnings | |
| 3075 char_O_deco_info = deco_info; | |
| 3076 char_O_deco_warnings = deco_warnings; | |
| 3077 | |
| 3078 // restore command flag to indicate that deco calculation cycle has finished | |
| 3079 char_O_deco_status = deco_status; | |
| 3080 | |
| 3081 // signal end of deco calculation | |
| 3082 next_planning_phase = PHASE_00_DONE; | |
| 3083 | |
| 3084 break; | |
| 3085 | |
| 3086 } // switch | |
| 3087 | |
| 3088 // read timer 5, result will be stored in tmr5_value (in 1/32 ms) and tmr5_overflow | |
| 3089 read_tmr5(); | |
| 3090 | |
| 3091 } // sequence calculation phases while not timed out and calculation cycle is not finished | |
| 3092 while( (tmr5_overflow == 0) && ( next_planning_phase != PHASE_00_DONE ) ); | |
| 3093 | |
| 3094 // report where we are in terms of depth reached, used in deco calculator to show deco calculation progress | |
| 3095 char_O_depth_sim = char_depth_sim; | |
| 3096 | |
| 3097 | |
| 3098 #ifdef _profiling | |
| 3099 | |
| 3100 //---- Performance Measurement ------------------------------------------- | |
| 3101 | |
| 3102 // convert timer 5 readout into ms | |
| 3103 profiling_runtime = tmr5_value / 32; | |
| 3104 | |
| 3105 // actual runtime longer than target runtime? | |
| 3106 if( tmr5_overflow ) | |
| 3107 { | |
| 3108 // YES - report excess | |
| 3109 int_O_profiling_overrun = profiling_runtime; | |
| 3110 | |
| 3111 // - excess > max we had so far? | |
| 3112 if( int_O_profiling_overrun > int_O_profiling_overrun_max ) | |
| 3113 { | |
| 3114 // YES - update max | |
| 3115 int_O_profiling_overrun_max = int_O_profiling_overrun; | |
| 3116 | |
| 3117 // - store the causing phase | |
| 3118 char_O_profiling_overrun_phase = profiling_phase; | |
| 3119 } | |
| 560 | 3120 } |
| 623 | 3121 else |
| 3122 { | |
| 3123 // NO - calculate unused budget and flag it to be under-run time | |
| 3124 int_O_profiling_overrun = (2048 - profiling_runtime) | 0x8000; | |
| 3125 } | |
| 3126 | |
| 3127 // increment number of runs in current cycle | |
| 3128 profiling_runs += 1; | |
| 3129 | |
| 3130 // planning cycle completed? | |
| 3131 if( next_planning_phase == PHASE_00_DONE ) | |
| 3132 { | |
| 3133 // YES - export number of runs it took | |
| 3134 if( deco_status & COMPLETED_NORM ) char_O_profiling_runs_norm = profiling_runs; | |
| 3135 else char_O_profiling_runs_alt = profiling_runs; | |
| 3136 } | |
| 3137 | |
| 3138 #endif | |
| 3139 | |
| 3140 } | |
| 3141 | |
| 3142 | |
| 3143 ////////////////////////////////////////////////////////////////////////////// | |
| 3144 // calc_hauptroutine_data_input | |
| 3145 // | |
| 3146 // Set all C-code dive parameters from their ASM-code values. | |
| 3147 // | |
| 3148 void calc_hauptroutine_data_input(void) | |
| 3149 { | |
| 3150 overlay float IG_ratio; | |
| 3151 | |
| 3152 // safeguard and convert the surface pressure (mbar -> bar) (*) | |
| 3153 if( int_I_pres_surface < 500 ) pres_surface = 0.500; | |
| 3154 else pres_surface = 0.001 * int_I_pres_surface; | |
| 3155 | |
| 3156 // safeguard and convert the current real pressure | |
| 3157 if( int_I_pres_respiration < 500 ) real_pres_respiration = 0.500; | |
| 3158 else real_pres_respiration = 0.001 * int_I_pres_respiration; | |
| 3159 | |
| 3160 // safeguard further parameters to protect the tissue-flag and the stop table | |
| 3161 if( char_I_sim_advance_time > 127 ) char_I_sim_advance_time = 127; | |
| 3162 if( char_I_extra_time > 127 ) char_I_extra_time = 127; | |
| 3163 if( char_I_gas_change_time > 99 ) char_I_gas_change_time = 99; | |
| 3164 | |
| 628 | 3165 |
| 3166 // compute the depth in meters where we are now | |
| 3167 float_depth_real = (real_pres_respiration - pres_surface) * BAR_TO_METER; | |
| 3168 | |
| 3169 // convert to integer and round up to next full meter | |
| 3170 char_depth_real = (unsigned char)(float_depth_real + 0.99); | |
| 3171 | |
| 3172 | |
| 623 | 3173 // calculate partial pressure of N2 in respired air at surface pressure |
| 3174 calc_N2_equilibrium(); | |
| 3175 | |
| 3176 // get, safeguard and convert the saturation and desaturation factors | |
| 3177 get_saturation_factors(); | |
| 3178 | |
| 3179 #ifdef _ccr_pscr | |
| 3180 // compute a factor that will be used later on for pSCR ppO2 drop calculation (*) | |
| 3181 float_pSCR_factor = 0.01 * char_I_PSCR_drop * char_I_PSCR_lungratio; | |
| 3182 #endif | |
| 3183 | |
| 3184 #ifdef _helium | |
| 3185 // get the currently breathed gas ratios | |
| 3186 real_O2_ratio = 0.01 * char_I_O2_ratio; | |
| 3187 real_He_ratio = 0.01 * char_I_He_ratio; | |
| 3188 | |
| 3189 // calculate the inert gas ratio (local helper variable) | |
| 3190 IG_ratio = 1.00 - real_O2_ratio; | |
| 3191 | |
| 3192 // calculate the N2 ratio | |
| 3193 real_N2_ratio = IG_ratio - real_He_ratio; | |
| 3194 #else | |
| 3195 // get the currently breathed O2 ratio | |
| 3196 real_O2_ratio = 0.01 * char_I_O2_ratio; | |
| 3197 | |
| 3198 // set the He ratio to zero | |
| 3199 real_He_ratio = 0.0; | |
| 3200 | |
| 3201 // calculate the N2 / inert gas ratio | |
| 3202 real_N2_ratio = IG_ratio = 1.00 - real_O2_ratio; | |
| 3203 #endif // _helium | |
| 3204 | |
| 3205 #ifdef _ccr_pscr | |
| 3206 // calculate ppO2 drop in pSCR loop for real tissues | |
| 3207 real_pSCR_drop = IG_ratio * float_pSCR_factor; | |
| 3208 #endif | |
| 3209 | |
| 0 | 3210 } |
| 3211 | |
| 3212 | |
| 3213 ////////////////////////////////////////////////////////////////////////////// | |
| 582 | 3214 // calc_tissues |
| 0 | 3215 // |
| 623 | 3216 // INPUT: ppN2 partial pressure of inspired N2 |
| 3217 // ppHe partial pressure of inspired He | |
| 3218 // tissue_increment integration time and tissue selector (real or simulated) | |
| 3219 // | |
| 3220 // MODIFIED: real_pres_tissue_N2[] tissue N2 pressures (in real tissues context) | |
| 3221 // real_pres_tissue_He[] tissue He pressures (in real tissues context) | |
| 3222 // sim_pres_tissue_N2[] tissue N2 pressures (in simulated tissues context) | |
| 3223 // sim_pres_tissue_He[] tissue He pressures (in simulated tissues context) | |
| 3224 // | |
| 3225 // OUTPUT: char_O_tissue_pres_N2[] tissue N2 pressures scaled for display purpose (in real tissues context) | |
| 3226 // char_O_tissue_pres_He[] tissue He pressures scaled for display purpose (in real tissues context) | |
| 3227 // char_O_tissue_pressure[] combined tissue pressures scaled for display purpose (in real tissue context) | |
| 582 | 3228 // |
| 3229 static void calc_tissues() | |
| 0 | 3230 { |
| 623 | 3231 overlay unsigned char period; |
| 560 | 3232 overlay float temp_tissue_N2; |
| 623 | 3233 |
| 3234 #ifdef _helium | |
| 560 | 3235 overlay float temp_tissue_He; |
| 623 | 3236 #endif |
| 582 | 3237 |
| 3238 | |
| 3239 assert( 0.00 <= ppN2 && ppN2 < 11.2 ); // 80% N2 at 130m | |
| 3240 assert( 0.00 <= ppHe && ppHe < 12.6 ); // 90% He at 130m | |
| 3241 | |
| 3242 | |
| 604 | 3243 for( ci=0; ci < NUM_COMP; ci++ ) // iterate through all compartments |
| 582 | 3244 { |
| 3245 i = tissue_increment & TIME_MASK; // extract number of minutes to do (if i > 0) | |
| 3246 // or if one 2 second period is to do (if i = 0) | |
| 3247 | |
| 3248 if( i == 0 ) // check if we shall do one 2-seconds period | |
| 560 | 3249 { |
| 623 | 3250 read_Buhlmann_times(0); // YES - program coefficients for a 2 seconds period |
| 3251 period = 1; // - set period length (in cycles) | |
| 3252 i = 1; // - and one cycle to do | |
| 560 | 3253 } |
| 582 | 3254 else if( i > 9 ) // check if we can start with 10 minutes periods |
| 560 | 3255 { |
| 623 | 3256 read_Buhlmann_times(2); // YES - program coefficients for 10 minutes periods |
| 3257 period = 10; // set period length (in cycles) to ten | |
| 560 | 3258 } |
| 623 | 3259 else // last but not lease, do 1 to 9 minutes |
| 560 | 3260 { |
| 623 | 3261 read_Buhlmann_times(1); // NO - program coefficients for 1 minute periods |
| 3262 period = 1; // - set period length (in cycles) to one | |
| 560 | 3263 } |
| 3264 | |
| 3265 do | |
| 3266 { | |
| 623 | 3267 //---- N2 -------------------------------------------------------- |
| 3268 | |
| 3269 temp_tissue = (tissue_increment & TISSUE_SELECTOR) ? real_pres_tissue_N2[ci] : sim_pres_tissue_N2[ci]; | |
| 560 | 3270 |
| 3271 temp_tissue = (ppN2 - temp_tissue) * var_N2_e; | |
| 3272 | |
| 623 | 3273 apply_saturation_factors(); |
| 3274 | |
| 3275 if( tissue_increment & TISSUE_SELECTOR ) | |
| 560 | 3276 { |
| 623 | 3277 temp_tissue_N2 = temp_tissue; |
| 3278 real_pres_tissue_N2[ci] += temp_tissue; | |
| 560 | 3279 } |
| 3280 else | |
| 3281 { | |
| 623 | 3282 sim_pres_tissue_N2[ci] += temp_tissue; |
| 560 | 3283 } |
| 3284 | |
| 623 | 3285 #ifdef _helium |
| 3286 //---- He -------------------------------------------------------- | |
| 3287 | |
| 3288 temp_tissue = (tissue_increment & TISSUE_SELECTOR) ? real_pres_tissue_He[ci] : sim_pres_tissue_He[ci]; | |
| 560 | 3289 |
| 3290 temp_tissue = (ppHe - temp_tissue) * var_He_e; | |
| 3291 | |
| 623 | 3292 apply_saturation_factors(); |
| 3293 | |
| 3294 if( tissue_increment & TISSUE_SELECTOR ) | |
| 560 | 3295 { |
| 623 | 3296 temp_tissue_He = temp_tissue; |
| 3297 real_pres_tissue_He[ci] += temp_tissue; | |
| 560 | 3298 } |
| 3299 else | |
| 3300 { | |
| 623 | 3301 sim_pres_tissue_He[ci] += temp_tissue; |
| 560 | 3302 } |
| 623 | 3303 #endif |
| 3304 | |
| 3305 //---- decrement loop counter and adjust step size --------------- | |
| 560 | 3306 |
| 3307 // decrement loop counter | |
| 3308 i -= period; | |
| 582 | 3309 |
| 560 | 3310 // check if we need to switch from 10 minute periods to 1 minute periods |
| 3311 if( (i > 0) && (period = 10) && (i < 10) ) | |
| 3312 { | |
| 582 | 3313 read_Buhlmann_times(1); // program coefficients for 1 minute periods |
| 560 | 3314 period = 1; // set period length (in cycles) to one |
| 3315 } | |
| 3316 } | |
| 3317 while( i ); | |
| 582 | 3318 |
| 3319 | |
| 560 | 3320 // have the computations been done for the "real" tissues? |
| 623 | 3321 if( tissue_increment & TISSUE_SELECTOR ) |
| 560 | 3322 { |
| 623 | 3323 |
| 3324 #ifdef _helium | |
| 3325 | |
| 560 | 3326 // net tissue balance |
| 3327 temp_tissue = temp_tissue_N2 + temp_tissue_He; | |
| 582 | 3328 |
| 623 | 3329 |
| 560 | 3330 // check tissue on-/off-gassing and IBCD with applying a threshold of +/-HYST |
| 3331 // | |
| 584 | 3332 if ( temp_tissue < -HYST ) // check if the tissue is off-gassing |
| 560 | 3333 { |
| 623 | 3334 // tag tissue as not experiencing mentionable IBCD |
| 3335 IBCD_tissue_vector &= ~(1 << ci); | |
| 560 | 3336 } |
| 3337 else if ( temp_tissue > +HYST ) // check if the tissue in on-gassing | |
| 3338 { | |
| 623 | 3339 // check for counter diffusion |
| 3340 if( ((temp_tissue_N2 > 0.0) && (temp_tissue_He < 0.0)) | |
| 604 | 3341 || ((temp_tissue_N2 < 0.0) && (temp_tissue_He > 0.0)) ) |
| 560 | 3342 { |
| 623 | 3343 // tag tissue as experiencing mentionable IBCD |
| 3344 IBCD_tissue_vector |= (1 << ci); | |
| 560 | 3345 } |
| 3346 } | |
| 3347 | |
| 623 | 3348 #endif |
| 3349 | |
| 3350 // For N2 tissue pressure display purpose: | |
| 3351 | |
| 3352 // basically keep the on-gassing / off-gassing flag from last invocation, but flip | |
| 3353 // it in case the rate exceeds a set hysteresis (actual value: see #define of HYST) | |
| 3354 char_O_tissue_pres_N2[ci] &= 128; | |
| 3355 if ( temp_tissue_N2 > +HYST ) char_O_tissue_pres_N2[ci] = 128; // set flag for tissue pressure is increasing | |
| 3356 else if ( temp_tissue_N2 < -HYST ) char_O_tissue_pres_N2[ci] = 0; // clear flag (-> tissue pressure is decreasing) | |
| 3357 | |
| 3358 // scale N2 tissue pressure such that the surface steady-state tissue loading | |
| 3359 // of [0.7902 * (1013 hPa - ppWater)] bar will give a 8, which aligns with | |
| 3360 // the 2nd scale line. | |
| 3361 temp_tissue_N2 = (8 / (0.7902 * (1.013 - ppWater))) * real_pres_tissue_N2[ci]; | |
| 3362 | |
| 3363 // limit to 127 to protect the uppermost bit which holds the sat/desat flag | |
| 3364 if (temp_tissue_N2 > 127) temp_tissue_N2 = 127; | |
| 3365 | |
| 3366 // convert to integer and combine with sat/desat flag | |
| 3367 char_O_tissue_pres_N2[ci] += (unsigned char)temp_tissue_N2; | |
| 3368 | |
| 3369 #ifdef _helium | |
| 3370 | |
| 3371 // For He tissue pressure display purpose: | |
| 3372 | |
| 3373 // basically keep the on-gassing / off-gassing flag from last invocation, but flip | |
| 3374 // it in case the rate exceeds a set hysteresis (actual value: see #define of HYST) | |
| 3375 char_O_tissue_pres_He[ci] &= 128; | |
| 3376 if ( temp_tissue_He > +HYST ) char_O_tissue_pres_He[ci] = 128; // set flag for tissue pressure is increasing | |
| 3377 else if ( temp_tissue_He < -HYST ) char_O_tissue_pres_He[ci] = 0; // clear flag (-> tissue pressure is decreasing) | |
| 3378 | |
| 3379 // scale He tissue pressure alike it is done for N2. | |
| 3380 // With no He in a tissue, the result will be 0. | |
| 3381 temp_tissue_He = (8 / (0.7902 * (1.013 - ppWater))) * real_pres_tissue_He[ci]; | |
| 3382 | |
| 3383 // limit to 127 to protect the uppermost bit which holds the sat/desat flag | |
| 3384 if (temp_tissue_He > 127) temp_tissue_He = 127; | |
| 3385 | |
| 3386 // convert to integer and combine with sat/desat flag | |
| 3387 char_O_tissue_pres_He[ci] += (unsigned char)temp_tissue_He; | |
| 3388 | |
| 3389 | |
| 3390 // For combined tissue pressure display purpose: | |
| 3391 | |
| 3392 // basically keep the on-gassing / off-gassing flag from last invocation, but flip | |
| 3393 // it in case the rate exceeds a set hysteresis (actual value: see #define of HYST) | |
| 3394 char_O_tissue_pressure[ci] &= 128; | |
| 3395 if ( temp_tissue > +HYST ) char_O_tissue_pressure[ci] = 128; // set flag for tissue pressure is increasing | |
| 3396 else if ( temp_tissue < -HYST ) char_O_tissue_pressure[ci] = 0; // clear flag (-> tissue pressure is decreasing) | |
| 3397 | |
| 3398 // add the two scaled pressures. | |
| 3399 temp_tissue = temp_tissue_N2 + temp_tissue_He; | |
| 3400 | |
| 3401 // limit to 127 to protect the uppermost bit which holds the sat/desat flag | |
| 560 | 3402 if (temp_tissue > 127) temp_tissue = 127; |
| 3403 | |
| 623 | 3404 // convert to integer and combine with sat/desat flag |
| 3405 char_O_tissue_pressure[ci] += (unsigned char)temp_tissue; | |
| 3406 | |
| 3407 #else | |
| 3408 | |
| 3409 // He tissue pressure is zero | |
| 3410 char_O_tissue_pres_He[ci] = 0; | |
| 3411 | |
| 3412 // combined tissue pressure equals N2 tissue pressure | |
| 3413 char_O_tissue_pressure[ci] = char_O_tissue_pres_N2[ci]; | |
| 3414 | |
| 3415 #endif | |
| 3416 | |
| 582 | 3417 } //if |
| 3418 | |
| 3419 } // for | |
| 0 | 3420 } |
| 3421 | |
| 623 | 3422 |
| 0 | 3423 ////////////////////////////////////////////////////////////////////////////// |
| 3424 // calc_limit | |
| 3425 // | |
| 623 | 3426 // Input: GF_parameter gradient factor to be used, negative values activate surface mode |
| 3427 // tissue_increment selector for context: real or simulated tissues | |
| 3428 // sim_pres_tissue_N2/_He tissue pressures (used in simulated tissues context) | |
| 3429 // real_pres_tissue_N2/_He tissue pressures (used in real tissues context) | |
| 3430 // | |
| 3431 // Output: lead_supersat highest supersaturation found among all tissues, 1.0 = 100% | |
| 3432 // lead_tissue number of the leading tissue (0-15) | |
| 3433 // ceiling ceiling in bar relative pressure | |
| 3434 // | |
| 3435 // Modified: deco_warnings for IBCD, micro bubbles and outside warning (only in real tissues context) | |
| 582 | 3436 // |
| 3437 static void calc_limit(PARAMETER float GF_parameter) | |
| 0 | 3438 { |
| 623 | 3439 overlay float pres_respiration_min_total = 0.0; |
| 3440 overlay unsigned char surface_mode = 0; // 0: off, 1: on | |
| 3441 | |
| 3442 | |
| 3443 // check mode | |
| 3444 if( GF_parameter < 0 ) | |
| 3445 { | |
| 3446 // activate surface mode | |
| 3447 surface_mode = 1; | |
| 3448 | |
| 3449 // normalize parameter | |
| 3450 GF_parameter = -GF_parameter; | |
| 3451 } | |
| 3452 | |
| 3453 // set leading tissue number to tissue 1 (it has the index 0) | |
| 3454 lead_tissue = 0; | |
| 604 | 3455 |
| 3456 // initialize leading tissue supersaturation value to null | |
| 623 | 3457 lead_supersat = 0.0; |
| 3458 | |
| 3459 // next code section is relevant only when invoked on the real tissues | |
| 3460 if( tissue_increment & TISSUE_SELECTOR ) | |
| 582 | 3461 { |
| 623 | 3462 // clear IBCD, micro-bubbles and outside warning flags (locked warnings will be preserved) |
| 3463 deco_warnings &= ~( DECO_WARNING_IBCD + DECO_WARNING_MBUBBLES + DECO_WARNING_OUTSIDE + DECO_ATTENTION_OUTSIDE ); | |
| 582 | 3464 } |
| 3465 | |
| 3466 // loop over all tissues | |
| 604 | 3467 for( ci = 0; ci < NUM_COMP; ci++ ) |
| 582 | 3468 { |
| 623 | 3469 overlay float pres_respiration_min_tissue; |
| 3470 | |
| 3471 | |
| 3472 // get the coefficients for tissue ci | |
| 3473 read_Buhlmann_coefficients(); | |
| 3474 | |
| 3475 #ifdef _helium | |
| 582 | 3476 |
| 3477 // get the tissue pressures | |
| 623 | 3478 // adopt_Buhlmann_coefficients needs calc_pres_tissue_N2/He when compiled for helium |
| 3479 if( tissue_increment & TISSUE_SELECTOR ) | |
| 560 | 3480 { |
| 582 | 3481 // context is real tissues |
| 623 | 3482 calc_pres_tissue_N2 = real_pres_tissue_N2[ci]; |
| 3483 calc_pres_tissue_He = real_pres_tissue_He[ci]; | |
| 560 | 3484 } |
| 3485 else | |
| 3486 { | |
| 582 | 3487 // context is simulated tissues |
| 3488 calc_pres_tissue_N2 = sim_pres_tissue_N2[ci]; | |
| 3489 calc_pres_tissue_He = sim_pres_tissue_He[ci]; | |
| 3490 } | |
| 3491 | |
| 3492 // overall tissue pressure | |
| 3493 pres_tissue = calc_pres_tissue_N2 + calc_pres_tissue_He; | |
| 3494 | |
| 623 | 3495 #else |
| 3496 | |
| 3497 // get the tissue pressure | |
| 3498 pres_tissue = ( tissue_increment & TISSUE_SELECTOR ) ? real_pres_tissue_N2[ci] : sim_pres_tissue_N2[ci]; | |
| 3499 | |
| 3500 #endif | |
| 582 | 3501 |
| 604 | 3502 // adopt a and b coefficients to current N2/He ratio inside the tissue |
| 3503 adopt_Buhlmann_coefficients(); | |
| 582 | 3504 |
| 3505 // next calculations are only relevant when invoked on the real tissues | |
| 623 | 3506 if( tissue_increment & TISSUE_SELECTOR ) |
| 582 | 3507 { |
| 618 | 3508 overlay float pres_tissue_max; |
| 582 | 3509 overlay float supersat; |
| 608 | 3510 overlay float baseline_threshold; |
| 604 | 3511 |
| 623 | 3512 |
| 582 | 3513 // check if tissue is in supersaturation |
| 618 | 3514 if( pres_tissue > real_pres_respiration ) |
| 582 | 3515 { |
| 618 | 3516 // calculate maximum allowed tissue pressure at current ambient pressure |
| 623 | 3517 pres_tissue_max = real_pres_respiration / var_b + var_a; |
| 618 | 3518 |
| 3519 // calculate current supersaturation value (1.0 = 100%) of this tissue according to straight Buhlmann | |
| 3520 supersat = ( pres_tissue - real_pres_respiration ) | |
| 3521 / ( pres_tissue_max - real_pres_respiration ); | |
| 3522 | |
| 623 | 3523 // calculate supersaturation value for display purpose: 1.35 = 135% = 86 pixel |
| 3524 if( supersat <= 1.35 ) char_O_tissue_saturation[ci] = (unsigned char)(supersat * 64); | |
| 3525 else char_O_tissue_saturation[ci] = 86; | |
| 3526 | |
| 582 | 3527 // memorize highest supersaturation found |
| 3528 if( supersat > lead_supersat ) lead_supersat = supersat; | |
| 3529 | |
| 608 | 3530 // tissue-dependent baseline threshold for micro bubbles and outside warnings |
| 3531 baseline_threshold = 0.02 * ci + 1.0; | |
| 3532 | |
| 3533 // micro bubbles warning: supersaturation > baseline threshold | |
| 3534 if( supersat > baseline_threshold ) | |
| 623 | 3535 deco_warnings |= (DECO_WARNING_MBUBBLES + DECO_WARNING_MBUBBLES_lock); |
| 604 | 3536 |
| 608 | 3537 // outside warning: supersaturation > baseline threshold + additional 5% margin |
| 623 | 3538 if( supersat > (baseline_threshold + 0.05) ) |
| 3539 deco_warnings |= (DECO_WARNING_OUTSIDE + DECO_WARNING_OUTSIDE_lock ); | |
| 3540 } | |
| 3541 else | |
| 3542 { | |
| 3543 // supersaturation is defined as zero while tissue pressure <= ambient pressure | |
| 3544 supersat = 0.0; | |
| 3545 char_O_tissue_saturation[ci] = 0; | |
| 560 | 3546 } |
| 623 | 3547 |
| 3548 // next only when in surface mode | |
| 3549 if( surface_mode ) | |
| 3550 { | |
| 3551 // tag tissue whether it is beyond the M-line limit or not | |
| 3552 if( supersat > 1.0 ) | |
| 3553 { | |
| 3554 char_O_tissue_pres_N2[ci] |= 128; | |
| 3555 #ifdef _helium | |
| 3556 char_O_tissue_pres_He[ci] |= 128; | |
| 3557 #endif | |
| 3558 char_O_tissue_pressure[ci] |= 128; | |
| 3559 } | |
| 3560 else | |
| 3561 { | |
| 3562 char_O_tissue_pres_N2[ci] &= ~128; | |
| 3563 #ifdef _helium | |
| 3564 char_O_tissue_pres_He[ci] &= ~128; | |
| 3565 #endif | |
| 3566 char_O_tissue_pressure[ci] &= ~128; | |
| 3567 } | |
| 3568 } | |
| 3569 } // real tissues | |
| 582 | 3570 |
| 618 | 3571 // calculate the minimum ambient pressure that the tissue can withstand |
| 3572 if( char_I_deco_model == 0 ) | |
| 3573 { | |
| 3574 // straight Buhlmann | |
| 623 | 3575 pres_respiration_min_tissue = (pres_tissue - var_a) * var_b; |
| 618 | 3576 } |
| 3577 else | |
| 3578 { | |
| 3579 // Buhlmann with Eric Baker's varying gradient factor correction | |
| 3580 // note: this equation [1] is the inverse of equation [2] | |
| 623 | 3581 pres_respiration_min_tissue = ( pres_tissue - (var_a * GF_parameter) ) |
| 3582 / ( 1.0 - GF_parameter + (GF_parameter / var_b ) ); | |
| 618 | 3583 } |
| 560 | 3584 |
| 3585 // check if this tissue requires a higher ambient pressure than was found to be needed up to now | |
| 623 | 3586 if( pres_respiration_min_tissue > pres_respiration_min_total ) |
| 582 | 3587 { |
| 623 | 3588 pres_respiration_min_total = pres_respiration_min_tissue; |
| 3589 lead_tissue = ci; | |
| 582 | 3590 } |
| 3591 } // for | |
| 3592 | |
| 604 | 3593 // compute ceiling for the real tissues in bar relative pressure |
| 623 | 3594 ceiling = pres_respiration_min_total - pres_surface; |
| 3595 | |
| 3596 #ifdef _helium | |
| 3597 // IBCD is checked for real tissues only | |
| 3598 if( tissue_increment & TISSUE_SELECTOR ) | |
| 560 | 3599 { |
| 604 | 3600 // check if the leading tissue is in IBCD condition |
| 623 | 3601 if( (IBCD_tissue_vector & (1 << lead_tissue)) |
| 3602 && ((real_pres_tissue_N2[lead_tissue] + real_pres_tissue_He[lead_tissue]) > real_pres_respiration) ) | |
| 582 | 3603 { |
| 623 | 3604 // leading tissue is in IBCD condition and in super-saturation, so issue a warning. |
| 3605 deco_warnings |= (DECO_WARNING_IBCD + DECO_WARNING_IBCD_lock); | |
| 582 | 3606 } |
| 560 | 3607 } |
| 623 | 3608 #endif |
| 3609 | |
| 0 | 3610 } |
| 623 | 3611 |
| 3612 | |
| 0 | 3613 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 3614 // calc_NDL_time_tissue |
| 3615 // | |
| 3616 // calculation of the remaining no decompression limit (NDL) time for a tissue | |
| 0 | 3617 // |
| 604 | 3618 // NOTE: Erik Baker's closed formula works for Nitrox. Trimix adds a second |
| 0 | 3619 // exponential term to the M-value equation, making it impossible to |
| 623 | 3620 // invert. So we have to solve the problem with a search approach. |
| 3621 // | |
| 3622 // Input: NDL_tissue tissue for which to calculate remaining NDL time | |
| 3623 // GF_high gradient factor used when GF factors are enabled | |
| 3624 // ppN2, ppHe partial pressures of N2 and He breathed | |
| 3625 // | |
| 3626 // Modified: NDL_time shortest NDL time found so far | |
| 3627 // NDL_tissue_lead leading tissue, i.e. tissue with the shortest NDL | |
| 3628 // | |
| 3629 static void calc_NDL_time_tissue(void) | |
| 0 | 3630 { |
| 623 | 3631 overlay unsigned char NDL_time_tissue = 0; // NDL time of this tissue, starting with 0 minutes |
| 3632 overlay unsigned char step_size = 10; // step size in searching, starting with 10 minutes | |
| 3633 overlay float pres_limit; // max. tissue pressure allowed | |
| 3634 | |
| 3635 #ifdef _helium | |
| 3636 overlay float last_pres_tissue_N2; // last tissue pressure for N2 | |
| 3637 overlay float last_pres_tissue_He; // last tissue pressure for He | |
| 3638 #else | |
| 3639 overlay float last_pres_tissue; // last tissue pressure | |
| 3640 #endif | |
| 3641 | |
| 3642 | |
| 3643 // set the compartment index ci for reading the Buhlmann increments and coefficients | |
| 3644 ci = NDL_tissue; | |
| 3645 | |
| 3646 // read the tissue increments for a step size of 10 minutes | |
| 3647 read_Buhlmann_times(2); | |
| 3648 | |
| 3649 // read Buhlmann a and b coefficients for tissue ci | |
| 3650 read_Buhlmann_coefficients(); | |
| 3651 | |
| 3652 #ifdef _helium | |
| 3653 | |
| 3654 // get the current simulated tissue pressures | |
| 3655 calc_pres_tissue_N2 = last_pres_tissue_N2 = sim_pres_tissue_N2[ci]; | |
| 3656 calc_pres_tissue_He = last_pres_tissue_He = sim_pres_tissue_He[ci]; | |
| 3657 | |
| 3658 #else | |
| 3659 | |
| 3660 // get the current simulated tissue pressure | |
| 3661 pres_tissue = last_pres_tissue = sim_pres_tissue_N2[ci]; | |
| 3662 | |
| 3663 // set the a and b coefficients | |
| 3664 adopt_Buhlmann_coefficients(); | |
| 3665 | |
| 3666 #endif | |
| 3667 | |
| 3668 // simulate an increasing bottom time and check when the NDL is hit | |
| 3669 for(;;) | |
| 582 | 3670 { |
| 623 | 3671 |
| 3672 #ifdef _helium | |
| 3673 | |
| 3674 // calculate the total tissue pressure | |
| 582 | 3675 pres_tissue = calc_pres_tissue_N2 + calc_pres_tissue_He; |
| 3676 | |
| 623 | 3677 // adopt a and b coefficients to current N2/He ratio inside the tissue |
| 3678 adopt_Buhlmann_coefficients(); | |
| 3679 | |
| 3680 #endif | |
| 3681 | |
| 3682 // compute the maximum tissue pressure allowed to be exposed to an | |
| 3683 // ambient pressure equaling the surface pressure | |
| 3684 if( char_I_deco_model != 0 ) | |
| 3685 { | |
| 3686 // GF model enabled, this equation [2] is the inverse of equation [1] | |
| 3687 pres_limit = (1.0 - GF_high + GF_high / var_b) * pres_surface + GF_high * var_a; | |
| 3688 } | |
| 3689 else | |
| 582 | 3690 { |
| 623 | 3691 // straight Buhlmann |
| 3692 pres_limit = pres_surface / var_b + var_a; | |
| 3693 } | |
| 3694 | |
| 3695 // is the tissue pressure higher than the maximum tissue pressure allowed? | |
| 3696 if( pres_tissue > pres_limit) | |
| 3697 { | |
| 3698 // YES - tissue is outside NDL | |
| 3699 | |
| 3700 // was the tissue outside NDL right from the start? | |
| 3701 if( NDL_time_tissue == 0 ) | |
| 582 | 3702 { |
| 623 | 3703 // YES - search can be aborted |
| 3704 | |
| 3705 // at least one tissue is outside NDL, so overall NDL time is zero | |
| 3706 NDL_time = 0; | |
| 3707 | |
| 3708 // store the number of this tissue as being the leading one | |
| 3709 NDL_tissue_lead = NDL_tissue; | |
| 3710 | |
| 3711 // done | |
| 582 | 3712 break; |
| 3713 } | |
| 3714 | |
| 623 | 3715 // when code execution passes here, the tissue has become |
| 3716 // being outside NDL after doing one or more search steps | |
| 3717 | |
| 3718 // still searching with a step size of 10 minutes? | |
| 3719 if( step_size == 10 ) | |
| 582 | 3720 { |
| 623 | 3721 // YES - retry with smaller step size |
| 3722 | |
| 3723 // go back to last NDL time | |
| 3724 NDL_time_tissue -= 10; | |
| 3725 | |
| 3726 #ifdef _helium | |
| 3727 | |
| 3728 // go back to last pressures | |
| 3729 calc_pres_tissue_N2 = last_pres_tissue_N2; | |
| 3730 calc_pres_tissue_He = last_pres_tissue_He; | |
| 3731 | |
| 3732 #else | |
| 3733 | |
| 3734 // go back to last pressure | |
| 3735 pres_tissue = last_pres_tissue; | |
| 3736 | |
| 3737 #endif | |
| 3738 | |
| 3739 // reduce step size to 1 minute | |
| 3740 step_size = 1; | |
| 3741 | |
| 3742 // read the tissue increments for a step size of 1 minute | |
| 3743 read_Buhlmann_times(1); | |
| 3744 | |
| 3745 // redo search from last pressure & time within NDL with smaller step size | |
| 582 | 3746 continue; |
| 3747 } | |
| 623 | 3748 else |
| 582 | 3749 { |
| 623 | 3750 // NO - already tried with a step size of 1 minute |
| 3751 | |
| 3752 // go back to last NDL time that was within NDL | |
| 3753 NDL_time_tissue -= 1; | |
| 3754 | |
| 3755 // is the NDL time of this tissue shorter than the overall NDL time found so far? | |
| 3756 if( NDL_time_tissue < NDL_time ) | |
| 3757 { | |
| 3758 // YES - set this tissue's NDL time as the new overall NDL time | |
| 3759 NDL_time = NDL_time_tissue; | |
| 3760 | |
| 3761 // - store the number of this tissue as being the leading one | |
| 3762 NDL_tissue_lead = NDL_tissue; | |
| 3763 } | |
| 3764 | |
| 3765 // done | |
| 3766 break; | |
| 582 | 3767 } |
| 623 | 3768 } |
| 3769 else | |
| 582 | 3770 { |
| 623 | 3771 // NO - tissue is still within NDL |
| 3772 | |
| 3773 // The search can be terminated when the NDL time of this tissue | |
| 3774 // exceeds the overall NDL time, thus when a shorter NDL time has | |
| 3775 // already been found with another tissue. | |
| 3776 if( NDL_time_tissue >= NDL_time ) break; | |
| 3777 | |
| 3778 #ifdef _helium | |
| 3779 | |
| 3780 // back-up current tissue pressures | |
| 3781 last_pres_tissue_N2 = calc_pres_tissue_N2; | |
| 3782 last_pres_tissue_He = calc_pres_tissue_He; | |
| 3783 | |
| 3784 #else | |
| 3785 | |
| 3786 // back-up current tissue pressure | |
| 3787 last_pres_tissue = pres_tissue; | |
| 3788 | |
| 3789 #endif | |
| 3790 | |
| 3791 // step forward NDL time of current tissue | |
| 3792 NDL_time_tissue += step_size; | |
| 3793 | |
| 3794 #ifdef _helium | |
| 3795 | |
| 3796 // step forward tissue pressure - N2 | |
| 3797 temp_tissue = (ppN2 - calc_pres_tissue_N2) * var_N2_e; // pressure delta breathed - tissue | |
| 3798 apply_saturation_factors(); // apply safety factor | |
| 3799 calc_pres_tissue_N2 += temp_tissue; // add pressure delta to tissue | |
| 3800 | |
| 3801 // step forward tissue pressure - He | |
| 3802 temp_tissue = (ppHe - calc_pres_tissue_He) * var_He_e; // pressure delta breathed - tissue | |
| 3803 apply_saturation_factors(); // apply safety factor | |
| 3804 calc_pres_tissue_He += temp_tissue; // add pressure delta to tissue | |
| 3805 | |
| 3806 #else | |
| 3807 | |
| 3808 // step forward tissue pressure | |
| 3809 temp_tissue = (ppN2 - pres_tissue ) * var_N2_e; // pressure delta breathed - tissue | |
| 3810 apply_saturation_factors(); // apply safety factor | |
| 3811 pres_tissue += temp_tissue; // add pressure delta to tissue | |
| 3812 | |
| 3813 #endif | |
| 3814 | |
| 582 | 3815 } |
| 623 | 3816 } |
| 0 | 3817 } |
| 3818 | |
| 604 | 3819 |
| 0 | 3820 ////////////////////////////////////////////////////////////////////////////// |
| 3821 // clear_deco_table | |
| 3822 // | |
| 623 | 3823 // Modified: internal_deco_time[] stop durations |
| 3824 // internal_deco_depth[] stop depths | |
| 3825 // internal_deco_gas[] gases used at stops | |
| 0 | 3826 // |
| 3827 static void clear_deco_table(void) | |
| 3828 { | |
| 623 | 3829 for( i = 0; i < NUM_STOPS; ++i ) |
| 582 | 3830 { |
| 623 | 3831 internal_deco_time [i] = 0; |
| 3832 internal_deco_depth[i] = 0; | |
| 3833 internal_deco_gas[i] = 0; | |
| 582 | 3834 } |
| 3835 | |
| 628 | 3836 // reset stop table index and chained stops counter |
| 3837 stop_index = 0; | |
| 3838 chained_stops = 0; | |
| 3839 | |
| 560 | 3840 // clear stop table overflow warning |
| 628 | 3841 deco_warnings &= ~DECO_WARNING_INCOMPLETE; |
| 0 | 3842 } |
| 3843 | |
| 623 | 3844 |
| 0 | 3845 ////////////////////////////////////////////////////////////////////////////// |
| 3846 // update_deco_table | |
| 3847 // | |
| 623 | 3848 // Add time to a stop at char_depth_sim |
| 560 | 3849 // |
| 3850 // It is possible to create stops with a duration of 0 minutes, e.g. to | |
| 3851 // note a gas change "on the fly" while ascending. Therefore the criteria | |
| 604 | 3852 // to have reached the end of the list is depth == 0. |
| 0 | 3853 // |
| 623 | 3854 // Input: char_depth_sim stop's depth, in meters |
| 3855 // sim_gas_current_num gas used at stop, as index 1..5 or 0 for gas 6 | |
| 3856 // time_increment number of minutes to add to the stop | |
| 3857 // | |
| 3858 // Updated: internal_deco_depth[] depth (in meters) of each stop | |
| 3859 // internal_deco_time [] time (in minutes) of each stop | |
| 3860 // internal_deco_gas [] gas used (index 1-5) at each stop | |
| 560 | 3861 // |
| 3862 static unsigned char update_deco_table(PARAMETER unsigned char time_increment) | |
| 0 | 3863 { |
| 623 | 3864 assert( char_depth_sim > 0 ); // no stop at surface |
| 560 | 3865 |
| 628 | 3866 |
| 3867 // is there already a stop entry matching with the current depth and gas? | |
| 3868 if( internal_deco_depth[stop_index] == char_depth_sim ) | |
| 3869 if( internal_deco_gas [stop_index] == sim_gas_current_num ) | |
| 560 | 3870 { |
| 628 | 3871 // YES - increment stop time if possible, stop time entries are |
| 3872 // limited to 99 minutes because of display constraints | |
| 3873 if( internal_deco_time[stop_index] < (100 - time_increment) ) | |
| 560 | 3874 { |
| 628 | 3875 // YES - time increment fits into current stop entry, |
| 3876 // increment stop time and return with status 'success' | |
| 3877 internal_deco_time[stop_index] += time_increment; | |
| 3878 return 1; | |
| 3879 } | |
| 3880 else | |
| 3881 { | |
| 3882 // NO - A chained stop entry will be created further down in the | |
| 3883 // code to continue the stop, but we will limit the number | |
| 3884 // of chained stop table entries in order to abort an ever- | |
| 3885 // running deco calculation. Too many chained entries? | |
| 3886 if( ++chained_stops >= STOP_CHAINING_LIMIT ) | |
| 560 | 3887 { |
| 628 | 3888 // YES - set overflow warning and return with status 'failed' |
| 3889 deco_warnings |= DECO_WARNING_INCOMPLETE; | |
| 3890 return 0; | |
| 560 | 3891 } |
| 3892 } | |
| 628 | 3893 } |
| 3894 | |
| 3895 // the current stop entry does not match the current depth and gas, | |
| 3896 // or hasn't enough room left for the time increment | |
| 3897 | |
| 3898 // is the current stop entry in use? | |
| 3899 if( internal_deco_depth[stop_index] > 0 ) | |
| 3900 { | |
| 3901 // YES - current entry is in use, need to move on | |
| 3902 // to next entry position if possible | |
| 3903 | |
| 3904 // have all entry positions been used up? | |
| 3905 if( stop_index < (NUM_STOPS - 1) ) | |
| 560 | 3906 { |
| 628 | 3907 // NO - move on to next entry position |
| 3908 stop_index += 1; | |
| 3909 } | |
| 3910 else | |
| 3911 { | |
| 3912 // YES - set overflow warning and return with status 'failed' | |
| 3913 deco_warnings |= DECO_WARNING_INCOMPLETE; | |
| 3914 return 0; | |
| 560 | 3915 } |
| 3916 } | |
| 3917 | |
| 628 | 3918 // initial use of a new (or the very first) stop entry, |
| 3919 // store all stop data and return with status 'success' | |
| 3920 internal_deco_time [stop_index] = time_increment; | |
| 3921 internal_deco_depth[stop_index] = char_depth_sim; | |
| 3922 internal_deco_gas [stop_index] = sim_gas_current_num; | |
| 3923 return 1; | |
| 3924 } | |
| 3925 | |
| 3926 | |
| 3927 ////////////////////////////////////////////////////////////////////////////// | |
| 3928 // publish_deco_table | |
| 3929 // | |
| 3930 // Input: internal_deco_depth[] depth in internal stops table | |
| 3931 // internal_deco_time[] times ... | |
| 3932 // internal_deco_gas[] gases ... | |
| 3933 // | |
| 3934 // Output: char_O_deco_depth[] depth in the external stops table | |
| 3935 // char_O_deco_time[] times ... | |
| 3936 // char_O_deco_gas[] gases ... | |
| 3937 // char_O_deco_time_for_log times in reverse order | |
| 3938 // | |
| 3939 static void publish_deco_table(void) | |
| 3940 { | |
| 3941 overlay unsigned char x = stop_index; | |
| 3942 overlay unsigned char y; | |
| 3943 | |
| 3944 | |
| 3945 // copy depth, time and gas from internal to external stops table | |
| 3946 for( y = 0; y < NUM_STOPS; y++ ) | |
| 3947 { | |
| 3948 char_O_deco_depth[y] = internal_deco_depth[y]; | |
| 3949 char_O_deco_time [y] = internal_deco_time [y]; | |
| 3950 char_O_deco_gas [y] = internal_deco_gas [y]; | |
| 3951 } | |
| 3952 | |
| 3953 // copy times of shallowest stops to logging table | |
| 3954 for(y = 0; y < NUM_STOPS_LOG; x-- ) | |
| 3955 { | |
| 3956 // copy all stops that have a non-null stop time | |
| 3957 if( internal_deco_time[x] ) | |
| 3958 char_O_deco_time_for_log[y++] = internal_deco_time[x]; | |
| 3959 | |
| 3960 // abort if all stops are copied | |
| 3961 if( x == 0) break; | |
| 3962 } | |
| 3963 | |
| 3964 // fill the remainder of the logging table with null | |
| 3965 // if it is not completely filled already | |
| 3966 while( y < NUM_STOPS_LOG ) | |
| 3967 { | |
| 3968 char_O_deco_time_for_log[y++] = 0; | |
| 3969 } | |
| 0 | 3970 } |
| 3971 | |
| 3972 | |
| 3973 ////////////////////////////////////////////////////////////////////////////// | |
| 623 | 3974 // calc_desaturation_time_helper |
| 0 | 3975 // |
| 560 | 3976 // Helper function |
| 3977 // | |
| 623 | 3978 // Input: pres_actual current tissue pressure |
| 3979 // pres_target target tissue pressure | |
| 3980 // var_ht half-time of the tissue | |
| 3981 // desat_factor desaturation factor | |
| 3982 // | |
| 3983 // Output: int_time time needed by tissue to reach target pressure | |
| 3984 // | |
| 604 | 3985 static void calc_desaturation_time_helper(void) |
| 0 | 3986 { |
| 623 | 3987 // check if actual pressure is higher then target pressure |
| 3988 if( pres_actual > pres_target ) | |
| 3989 { | |
| 3990 // YES - compute remaining time | |
| 3991 | |
| 604 | 3992 overlay float pres_ratio; |
| 582 | 3993 |
| 623 | 3994 // compute pressure ratio to archive |
| 560 | 3995 pres_ratio = pres_actual / pres_target; |
| 3996 | |
| 3997 // Compute desaturation time with result rounded up to multiples of 10 minutes. | |
| 582 | 3998 // Main purpose is to avoid confusion, because the times do not clock down in |
| 3999 // one minute steps any more but get constantly re-computed according to current | |
| 4000 // ambient pressure and may therefor make steps of several minutes forwards and | |
| 604 | 4001 // backwards as ambient pressure rises/falls and N2/He ratio is being adjusted. |
| 623 | 4002 int_time = (unsigned short)( (var_ht * log(pres_ratio) / desat_factor) + 0.9 ); |
| 560 | 4003 } |
| 4004 else | |
| 623 | 4005 { |
| 4006 // NO - desaturation state reached, no remaining time | |
| 582 | 4007 int_time = 0; |
| 560 | 4008 } |
| 4009 } | |
| 4010 | |
| 623 | 4011 |
| 560 | 4012 ///////////////////////////////////////////////////////////////////////////// |
| 604 | 4013 // calc_desaturation_time |
| 4014 // | |
| 623 | 4015 // Calculates the time needed for the tissues to equilibrate with |
| 4016 // surface pressure and the no-fly / no-altitude time. | |
| 4017 // | |
| 4018 // Input: int_I_pres_surface | |
| 4019 // char_I_desaturation_multiplier | |
| 4020 // | |
| 4021 // Output: int_O_desaturation_time | |
| 4022 // int_O_nofly_time | |
| 560 | 4023 // |
| 4024 void calc_desaturation_time(void) | |
| 4025 { | |
| 623 | 4026 overlay float P_ambient_altitude; |
| 4027 | |
| 604 | 4028 assert( 800 < int_I_pres_surface && int_I_pres_surface < 1100 ); |
| 4029 assert( 0 < char_I_desaturation_multiplier && char_I_desaturation_multiplier <= 100 ); | |
| 4030 | |
| 4031 | |
| 623 | 4032 // safeguard and convert surface pressure |
| 4033 if( int_I_pres_surface < 500) pres_surface = 0.5; | |
| 4034 else pres_surface = 0.001 * int_I_pres_surface; | |
| 4035 | |
| 4036 // calculate partial pressure of N2 in respired air at surface pressure | |
| 4037 calc_N2_equilibrium(); | |
| 4038 | |
| 4039 // get, safeguard and convert the saturation and desaturation factors | |
| 4040 get_saturation_factors(); | |
| 4041 | |
| 4042 // pre-computed term for later use: 10 [Min] * 0.6931 [=log(2)] * 1 [Desat Factor] * ... | |
| 4043 desat_factor = (6.931 * SURFACE_DESAT_FACTOR) * float_desaturation_multiplier; | |
| 582 | 4044 |
| 4045 // initialize vars | |
| 560 | 4046 int_O_desaturation_time = 0; |
| 582 | 4047 int_O_nofly_time = 0; |
| 4048 | |
| 623 | 4049 // get selected target altitude |
| 4050 switch( char_I_altitude_wait ) | |
| 4051 { | |
| 4052 case 1: P_ambient_altitude = P_ambient_1000m; break; | |
| 4053 case 2: P_ambient_altitude = P_ambient_2000m; break; | |
| 4054 case 3: P_ambient_altitude = P_ambient_3000m; break; | |
| 4055 default: P_ambient_altitude = P_ambient_fly; break; | |
| 4056 } | |
| 4057 | |
| 4058 // loop over all compartments in order slowest to fastest | |
| 604 | 4059 for( ci = NUM_COMP; ci > 0; ) |
| 582 | 4060 { |
| 623 | 4061 overlay float pres_tissue_max; |
| 4062 overlay unsigned short nofly_last = ~0; | |
| 4063 overlay unsigned short nofly_N2 = 0; | |
| 4064 | |
| 4065 #ifdef _helium | |
| 4066 overlay signed char search_direction; | |
| 4067 overlay unsigned short nofly_He = 0; | |
| 4068 #endif | |
| 4069 | |
| 4070 | |
| 4071 // decrement compartment index | |
| 560 | 4072 ci -= 1; |
| 582 | 4073 |
| 623 | 4074 // get the Buhlmann halftimes and coefficients |
| 582 | 4075 read_Buhlmann_ht(); |
| 560 | 4076 read_Buhlmann_coefficients(); |
| 582 | 4077 |
| 623 | 4078 |
| 4079 // | |
| 4080 // Desaturation time | |
| 4081 // | |
| 4082 | |
| 4083 // calculate desaturation time for N2 in tissue, | |
| 4084 // desaturated state is defined as residual tissue pressure <= 1.05 x ppN2 respired | |
| 4085 | |
| 4086 // current tissue pressure above equilibrium pressure | |
| 4087 pres_actual = real_pres_tissue_N2[ci] - N2_equilibrium; | |
| 4088 | |
| 4089 // target pressure above equilibrium pressure | |
| 4090 pres_target = 0.05 * N2_equilibrium; | |
| 4091 | |
| 4092 // half-time of the current tissue | |
| 4093 var_ht = var_N2_ht; | |
| 4094 | |
| 4095 // calculate desaturation time | |
| 4096 calc_desaturation_time_helper(); | |
| 4097 | |
| 4098 // store desaturation time if it is longer than longest found so far | |
| 4099 if( int_time > int_O_desaturation_time) int_O_desaturation_time = int_time; | |
| 4100 | |
| 4101 | |
| 4102 #ifdef _helium | |
| 4103 | |
| 4104 // calculate desaturation time for He in the tissue, | |
| 4105 // desaturated state is defined as residual tissue pressure <= 0.05 x ppN2 respired | |
| 4106 | |
| 4107 // actual tissue pressure above equilibrium: equilibrium for He is 0 bar | |
| 4108 pres_actual = real_pres_tissue_He[ci]; | |
| 4109 | |
| 4110 // target pressure above equilibrium pressure: use same target pressure as for N2 | |
| 4111 pres_target = 0.05 * N2_equilibrium; | |
| 4112 | |
| 4113 // half-time of the current tissue | |
| 4114 var_ht = var_He_ht; | |
| 4115 | |
| 4116 // calculate desaturation time | |
| 4117 calc_desaturation_time_helper(); | |
| 4118 | |
| 4119 // store desaturation time if it is longer than longest found so far | |
| 4120 if( int_time > int_O_desaturation_time) int_O_desaturation_time = int_time; | |
| 4121 | |
| 4122 #endif | |
| 4123 | |
| 4124 // | |
| 4125 // no-fly time | |
| 4126 // | |
| 582 | 4127 |
| 560 | 4128 // Target pressure for the tissue is the Buhlmann limit. We use the Buhlmann |
| 4129 // coefficients for N2 also for He because it is easier to calculate and the | |
| 4130 // N2 coefficients are more conservative than those for He, so we are on the | |
| 4131 // safe side, too. | |
| 582 | 4132 pres_tissue_max = (P_ambient_altitude/var_N2_b + var_N2_a); |
| 4133 | |
| 623 | 4134 // adjust target pressure by GF-high in case the GF model is in use, but not |
| 4135 // for the no-fly time as it's target pressure is hard to reach anyhow | |
| 4136 if( char_I_deco_model && char_I_altitude_wait ) | |
| 4137 pres_tissue_max = P_ambient_altitude + | |
| 4138 0.01 * char_I_GF_High_percentage * (pres_tissue_max - P_ambient_altitude); | |
| 4139 | |
| 4140 | |
| 4141 #ifdef _helium | |
| 4142 | |
| 4143 //---- Variant with Helium ------------------------------------------- | |
| 4144 | |
| 4145 // initialize split_N2_He in case there was a hard reboot / memory clear | |
| 604 | 4146 if( split_N2_He[ci] == 0 ) split_N2_He[ci] = 90; |
| 4147 | |
| 560 | 4148 // initialize search direction |
| 4149 search_direction = 0; | |
| 582 | 4150 |
| 560 | 4151 for(;;) |
| 4152 { | |
| 4153 // Calculate no-fly time for N2 in the tissue. | |
| 4154 // Flying is permitted when the N2 pressure fits into the assigned fraction above equilibrium. | |
| 4155 | |
| 623 | 4156 // current tissue pressure above equilibrium |
| 4157 pres_actual = real_pres_tissue_N2[ci] - N2_equilibrium; | |
| 4158 | |
| 4159 // target pressure above equilibrium pressure, weighted by N2/He split | |
| 560 | 4160 pres_target = (split_N2_He[ci] * 0.01) * (pres_tissue_max - N2_equilibrium); |
| 4161 | |
| 623 | 4162 // half-time of the current tissue |
| 4163 var_ht = var_N2_ht; | |
| 4164 | |
| 4165 // check if desaturation to target pressure is possible at all | |
| 4166 if( pres_target < 0.0 ) | |
| 560 | 4167 { |
| 623 | 4168 // NO - set no-fly time to 288 * 10 min = 48 h |
| 4169 int_O_nofly_time = 288; | |
| 4170 break; | |
| 560 | 4171 } |
| 604 | 4172 else |
| 560 | 4173 { |
| 623 | 4174 // YES - calculate desaturation time |
| 560 | 4175 calc_desaturation_time_helper(); |
| 623 | 4176 |
| 4177 // store time found | |
| 582 | 4178 nofly_N2 = int_time; |
| 560 | 4179 } |
| 582 | 4180 |
| 623 | 4181 // calculate no-fly time for He in the tissue, |
| 4182 // flying is permitted when the He pressure fits into the assigned fraction | |
| 4183 | |
| 4184 // current tissue pressure above equilibrium: equilibrium for He is 0 bar | |
| 4185 pres_actual = real_pres_tissue_He[ci]; | |
| 4186 | |
| 4187 // target pressure above equilibrium pressure, weighted by N2/He split | |
| 4188 pres_target = ((100 - split_N2_He[ci]) * 0.01) * (pres_tissue_max - N2_equilibrium); | |
| 4189 | |
| 4190 // half-time of the current tissue | |
| 582 | 4191 var_ht = var_He_ht; |
| 4192 | |
| 623 | 4193 // calculate desaturation time |
| 560 | 4194 calc_desaturation_time_helper(); |
| 623 | 4195 |
| 4196 // store time found | |
| 582 | 4197 nofly_He = int_time; |
| 560 | 4198 |
| 4199 | |
| 4200 // Because the sum of N2 and He tissue pressures needs to fit into the Buhlmann limit for | |
| 4201 // no-fly time calculation, each gas gets assigned a fraction of the available total pressure | |
| 623 | 4202 // limit. The optimum split between the two gases can not be computed by a single formula, |
| 560 | 4203 // because this would require the inversion of a function with two exponential terms, which is |
| 4204 // not possible. We do not want to do a computational complex simulation here like it is done | |
| 4205 // in the deco calculation code (although we tackle the same base problem here), so we just let | |
| 4206 // the computer try out which split will balance the no-fly times induced by the N2 and the He | |
| 4207 // at best. | |
| 582 | 4208 |
| 560 | 4209 // first of all, skip any optimization in case the current compartment is not the leading one |
| 4210 if( (nofly_N2 <= int_O_nofly_time) && (nofly_He <= int_O_nofly_time) ) break; | |
| 4211 | |
| 4212 // check if the N2 requires more waiting time than the He | |
| 582 | 4213 if( nofly_N2 >= nofly_He ) |
| 560 | 4214 { |
| 4215 // check if the search direction has changed, which means we are beyond the | |
| 4216 // optimum now, or if we are at the upper stop limit of split_N2_He | |
| 4217 if( (search_direction < 0) || (split_N2_He[ci] == 99) ) | |
| 604 | 4218 { |
| 623 | 4219 // either the just completed iteration was more close to the optimum or the one before |
| 4220 // was, so we take the best (i.e. shortest) time of both as the final no-fly time | |
| 560 | 4221 int_O_nofly_time = (nofly_N2 < nofly_last) ? nofly_N2 : nofly_last; |
| 623 | 4222 |
| 4223 // done | |
| 560 | 4224 break; |
| 4225 } | |
| 4226 | |
| 4227 // store the no-fly time found in this iteration | |
| 582 | 4228 nofly_last = nofly_N2; |
| 4229 | |
| 623 | 4230 // increase the N2 fraction of the split |
| 560 | 4231 split_N2_He[ci] += 1; |
| 623 | 4232 |
| 4233 // set search direction towards more N2 | |
| 560 | 4234 search_direction = +1; |
| 4235 } | |
| 4236 else | |
| 4237 { | |
| 4238 // check if the search direction has changed, which means we are beyond the | |
| 4239 // optimum now, or if we are at the lower stop limit of split_N2_He | |
| 4240 if( (search_direction > 0) || (split_N2_He[ci] == 1) ) | |
| 582 | 4241 { |
| 623 | 4242 // either the just completed iteration was more close to the optimum or the one before |
| 4243 // was, so we take the best (i.e. shortest) time of both as the final no-fly time | |
| 560 | 4244 int_O_nofly_time = (nofly_He < nofly_last) ? nofly_He : nofly_last; |
| 623 | 4245 |
| 4246 // done | |
| 560 | 4247 break; |
| 4248 } | |
| 4249 | |
| 4250 // store the no-fly time found in this iteration | |
| 582 | 4251 nofly_last = nofly_He; |
| 4252 | |
| 623 | 4253 // decrease the N2 fraction of the split |
| 560 | 4254 split_N2_He[ci] -= 1; |
| 623 | 4255 |
| 4256 // set search direction towards less N2 | |
| 604 | 4257 search_direction = -1; |
| 560 | 4258 } |
| 582 | 4259 |
| 560 | 4260 } // for(;;) |
| 4261 | |
| 623 | 4262 #else |
| 4263 | |
| 4264 //---- Variant without Helium ---------------------------------------- | |
| 4265 | |
| 4266 // current tissue pressure above equilibrium | |
| 4267 pres_actual = real_pres_tissue_N2[ci] - N2_equilibrium; | |
| 4268 | |
| 4269 // target pressure above equilibrium pressure | |
| 4270 pres_target = pres_tissue_max - N2_equilibrium; | |
| 4271 | |
| 4272 // half-time of the current tissue | |
| 4273 var_ht = var_N2_ht; | |
| 4274 | |
| 4275 // check if desaturation to target pressure is possible at all | |
| 4276 if( pres_target < 0.0 ) | |
| 4277 { | |
| 4278 // NO - set no-fly time to 288 * 10 min = 48 h | |
| 4279 int_O_nofly_time = 288; | |
| 4280 } | |
| 4281 else | |
| 4282 { | |
| 4283 // YES - calculate desaturation time | |
| 4284 calc_desaturation_time_helper(); | |
| 4285 | |
| 4286 // - extend desaturation time if this tissue needs | |
| 4287 // more time than already found to be needed | |
| 4288 if( int_time > int_O_nofly_time ) int_O_nofly_time = int_time; | |
| 4289 } | |
| 4290 | |
| 4291 #endif | |
| 4292 | |
| 560 | 4293 } // for(compartments) |
| 4294 | |
| 582 | 4295 |
| 623 | 4296 // rescale int_O_desaturation_time and int_O_nofly_time to full minutes for display purpose |
| 560 | 4297 int_O_desaturation_time *= 10; |
| 4298 int_O_nofly_time *= 10; | |
| 582 | 4299 |
| 623 | 4300 // limit int_O_desaturation_time and int_O_nofly_time to 5999 = 99 hours + 59 minutes |
| 4301 // because of display space constraints and rounding done above | |
| 560 | 4302 if( int_O_desaturation_time > 5999 ) int_O_desaturation_time = 5999; |
| 4303 if( int_O_nofly_time > 5999 ) int_O_nofly_time = 5999; | |
| 4304 | |
| 4305 | |
| 623 | 4306 // Clear the micro bubbles warning when the current gradient factor is < 100%. |
| 604 | 4307 // The current gradient factor is calculated by calc_interval() while not in diving mode. |
| 4308 // As the locked warning will stay set, this will cause the warning be be displayed in | |
| 4309 // attention color instead of warning color. | |
| 623 | 4310 if( int_O_lead_supersat < 100 ) |
| 4311 deco_warnings &= ~DECO_WARNING_MBUBBLES; | |
| 582 | 4312 |
| 560 | 4313 // clear some warnings when the desaturation time has become zero |
| 582 | 4314 if( int_O_desaturation_time == 0 ) |
| 623 | 4315 deco_warnings &= ~( DECO_WARNING_IBCD + DECO_WARNING_IBCD_lock |
| 4316 + DECO_WARNING_MBUBBLES + DECO_WARNING_MBUBBLES_lock | |
| 4317 + DECO_WARNING_OUTSIDE + DECO_WARNING_OUTSIDE_lock | |
| 4318 + DECO_ATTENTION_OUTSIDE ); | |
| 0 | 4319 } |
| 4320 | |
| 623 | 4321 |
| 0 | 4322 ////////////////////////////////////////////////////////////////////////////// |
| 582 | 4323 // Calculate desaturation of the real tissues for a given time interval |
| 0 | 4324 // |
| 582 | 4325 // Caution: Works on the real tissues! |
| 4326 // If in doubt, use this function only inside a context surrounded with | |
| 4327 // push_tissues_to_vault() / pull_tissues_from_vault() ! | |
| 4328 // | |
| 623 | 4329 // Input: int_I_pres_surface surface pressure in mbar |
| 4330 // time_interval time interval in minutes, must be limited to 254 at max | |
| 4331 // | |
| 4332 // Modified: tissue pressures N2 and He pressures of the tissues | |
| 4333 // CNS_fraction_real current real CNS value | |
| 4334 // ceiling minimum allowed depth in mbar relative pressure | |
| 4335 // lead_supersat supersaturation of the leading tissue (float) | |
| 4336 // int_O_lead_supersat supersaturation of the leading tissue (integer) | |
| 560 | 4337 // |
| 582 | 4338 static void calc_interval(PARAMETER unsigned char time_interval) |
| 0 | 4339 { |
| 582 | 4340 overlay unsigned char time; |
| 4341 | |
| 4342 assert( 800 < int_I_pres_surface && int_I_pres_surface < 1100 ); | |
| 604 | 4343 assert( 100 <= char_I_saturation_multiplier && char_I_saturation_multiplier < 200 ); |
| 4344 assert( 0 < char_I_desaturation_multiplier && char_I_desaturation_multiplier <= 100 ); | |
| 4345 | |
| 4346 | |
| 623 | 4347 // safeguard and convert surface pressure |
| 4348 if( int_I_pres_surface < 500) pres_surface = 0.500; | |
| 4349 else pres_surface = 0.001 * int_I_pres_surface; | |
| 4350 | |
| 4351 // set breathed pressure to surface pressure | |
| 4352 real_pres_respiration = pres_surface; | |
| 4353 | |
| 4354 // calculate partial pressure of N2 in respired air at surface pressure | |
| 4355 calc_N2_equilibrium(); | |
| 4356 | |
| 4357 // calculate partial pressures (0.7902 is fraction of N2 in atmosphere as of Buhlmann) | |
| 4358 ppN2 = N2_equilibrium; | |
| 4359 ppHe = 0.0; | |
| 4360 | |
| 4361 // get, safeguard and convert the saturation and desaturation factors | |
| 4362 get_saturation_factors(); | |
| 4363 | |
| 4364 // adjust desaturation factor to surface mode | |
| 4365 float_desaturation_multiplier *= SURFACE_DESAT_FACTOR; | |
| 582 | 4366 |
| 4367 // Calculate the tissues: | |
| 4368 // Because calc_tissues() can calculate for 127 minutes at max, | |
| 4369 // the tissue updating may need to be done in two chunks. | |
| 4370 | |
| 4371 time = time_interval; | |
| 4372 | |
| 4373 // first chunk for the part exceeding 127 minutes | |
| 4374 if( time > 127) | |
| 560 | 4375 { |
| 582 | 4376 // do a full 127 minutes on the real tissues |
| 623 | 4377 tissue_increment = TISSUE_SELECTOR | 127; |
| 582 | 4378 calc_tissues(); |
| 4379 | |
| 623 | 4380 // determine the remaining time |
| 582 | 4381 time -= 127; |
| 560 | 4382 } |
| 4383 | |
| 623 | 4384 // program the remaining time (or full time if not exceeding 127 minutes) on the real tissues |
| 4385 tissue_increment = TISSUE_SELECTOR | time; | |
| 604 | 4386 |
| 4387 // update the N2 and He pressures in the tissues | |
| 582 | 4388 calc_tissues(); |
| 4389 | |
| 560 | 4390 |
| 4391 // Calculate CNS: | |
| 4392 // To speed up things and because on most invocations of this code char_I_dive_interval | |
| 4393 // is a multiple of 10 minutes, we loop the loop-counter down using two speeds. | |
| 4394 | |
| 582 | 4395 time = time_interval; |
| 4396 | |
| 604 | 4397 while( time ) |
| 560 | 4398 { |
| 582 | 4399 if( time > 9 ) |
| 560 | 4400 { |
| 623 | 4401 CNS_fraction_real *= 0.925874712; // half-time = 90 min -> 10 min: (1/2)^(1/9) |
| 4402 time -= 10; // fast speed looping | |
| 560 | 4403 } |
| 4404 else | |
| 4405 { | |
| 623 | 4406 CNS_fraction_real *= 0.992327946; // half-time = 90 min -> 1 min: (1/2)^(1/90) |
| 4407 time -= 1; // slow speed looping | |
| 560 | 4408 } |
| 582 | 4409 } |
| 560 | 4410 |
| 623 | 4411 // convert the CNS value to integer |
| 4412 convert_cur_CNS_for_display(); | |
| 4413 | |
| 4414 // calculate the supersaturation of the leading tissue, the | |
| 4415 // negative argument puts calc_limit() into surface mode | |
| 4416 // Attention: do not pass char_I_GF_High_percentage as an argument | |
| 4417 // here because it is not configured outside dive mode | |
| 4418 calc_limit(-1.0); | |
| 4419 | |
| 4420 // convert the saturation value of the leading tissue to integer | |
| 4421 convert_sat_for_display(); | |
| 0 | 4422 } |
| 4423 | |
| 560 | 4424 |
| 4425 ////////////////////////////////////////////////////////////////////////////// | |
| 604 | 4426 // calc_CNS |
| 560 | 4427 // |
| 623 | 4428 // Input: char_ppO2 current ppO2 [in 0.1 bars] |
| 4429 // tissue_increment time increment and tissue selector | |
| 4430 // | |
| 4431 // Modified: CNS_fraction_real accumulated CNS (real tissue context) | |
| 4432 // CNS_fraction_sim accumulated CNS (simulated tissue context) | |
| 560 | 4433 // |
| 604 | 4434 static void calc_CNS(void) |
| 560 | 4435 { |
| 604 | 4436 overlay float CNS_fraction_inc; // increment of CNS load, 0.01 = 1% |
| 623 | 4437 |
| 4438 | |
| 4439 // calculate CNS increment for 2 seconds interval | |
| 4440 if( char_ppO2 > 160 ) | |
| 4441 { | |
| 4442 // step-wise CNS increment | |
| 4443 | |
| 4444 // calculate index for increment look-up | |
| 4445 cns_i = (char_ppO2 - 161) / 5; // integer division | |
| 4446 | |
| 628 | 4447 // indexes > 17 use increment of index 17 |
| 4448 if( cns_i > 17 ) cns_i = 17; | |
| 4449 | |
| 623 | 4450 // read coefficient (increment) |
| 4451 read_CNS_c_coefficient(); | |
| 4452 | |
| 4453 // re-scale coefficient from storage format in [1/100000] to productive value | |
| 4454 CNS_fraction_inc = (float)var_cns_c / 100000.0; | |
| 4455 } | |
| 4456 else if( char_ppO2 > 50 ) | |
| 4457 { | |
| 4458 // range wise CNS increment approximation | |
| 4459 | |
| 4460 // calculate index for approximation coefficients look-up | |
| 4461 cns_i = (char_ppO2 - 51) / 10; // integer division | |
| 4462 | |
| 4463 // read coefficients | |
| 4464 read_CNS_ab_coefficient(); | |
| 4465 | |
| 4466 // calculate the CNS increment | |
| 4467 CNS_fraction_inc = 1.0 / (var_cns_a * char_ppO2 + var_cns_b ); | |
| 4468 } | |
| 4469 else | |
| 4470 { // no increment up to 0.5 bar ppO2 | |
| 4471 CNS_fraction_inc = 0.0; | |
| 4472 } | |
| 4473 | |
| 4474 // apply a time factor in case of minute-based interval (factor = N * 30.0) | |
| 4475 if( tissue_increment & TIME_MASK ) | |
| 4476 { | |
| 4477 CNS_fraction_inc *= (float)(tissue_increment & TIME_MASK) * 30.0; | |
| 4478 } | |
| 604 | 4479 |
| 4480 // update the CNS accumulator | |
| 623 | 4481 if ( tissue_increment & TISSUE_SELECTOR ) CNS_fraction_real += CNS_fraction_inc; // real tissues |
| 4482 else CNS_fraction_sim += CNS_fraction_inc; // simulated tissues | |
| 4483 } | |
| 4484 | |
| 4485 | |
| 4486 ////////////////////////////////////////////////////////////////////////////// | |
| 4487 // calc_due_by_depth_time_sac (Helper Function saving Code Space) | |
| 4488 // | |
| 4489 // Calculates the gas volume required for a given depth, time and usage (SAC) | |
| 4490 // rate. It uses a fixed surface pressure of 1.0 bar to deliver stable results | |
| 4491 // when used through the deco calculator. | |
| 4492 // | |
| 628 | 4493 // Input: gas_needs_depth depth in meters |
| 4494 // gas_needs_time time in minutes | |
| 4495 // gas_needs_usage_rate gas usage in liters per minute at surface pressure | |
| 623 | 4496 // |
| 628 | 4497 // Output: gas_needs_volume_due required gas volume in liters |
| 623 | 4498 // |
| 4499 static void calc_due_by_depth_time_sac(void) | |
| 4500 { | |
| 628 | 4501 gas_needs_volume_due = ((float)gas_needs_depth * METER_TO_BAR + pres_surface) * gas_needs_time * gas_needs_usage_rate; |
| 0 | 4502 } |
| 4503 | |
| 560 | 4504 |
| 0 | 4505 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 4506 // calc_TR_functions |
| 4507 // | |
| 4508 // Process Pressure Readings (OSTC TR only) | |
| 4509 // | |
| 4510 // Input: todo | |
| 4511 // | |
| 4512 // Output: todo | |
| 4513 // | |
| 4514 #ifdef _rx_functions | |
| 4515 static void calc_TR_functions(void) | |
| 560 | 4516 { |
| 623 | 4517 // pressure warnings for reading 1, but only if enabled and pressure value available |
| 4518 if( (char_I_pressure_gas[0] > 0) && !(int_IO_pressure_value[0] & INT_FLAG_NOT_AVAIL) ) | |
| 604 | 4519 { |
| 623 | 4520 overlay unsigned short pressure_value = int_IO_pressure_value[0] & ~INT_FLAG_OUTDATED; |
| 4521 | |
| 4522 if( (char_I_pressure_gas[0] < 6 ) && !(int_O_pressure_need[0] & INT_FLAG_NOT_AVAIL) ) | |
| 4523 { | |
| 4524 // not a diluent and need available: warning & attention by need | |
| 4525 if ( pressure_value <= int_O_pressure_need[0]) | |
| 4526 int_IO_pressure_value[0] |= INT_FLAG_WARNING; | |
| 4527 else if( pressure_value <= int_O_pressure_need[0] + int_O_pressure_need[0] / 2 ) | |
| 4528 int_IO_pressure_value[0] |= INT_FLAG_ATTENTION; | |
| 4529 } | |
| 4530 else | |
| 4531 { | |
| 4532 // a diluent or need not available: warning & attention by fixed thresholds | |
| 4533 if ( pressure_value <= PRESSURE_LIMIT_WARNING ) int_IO_pressure_value[0] |= INT_FLAG_WARNING; | |
| 4534 else if ( pressure_value <= PRESSURE_LIMIT_ATTENTION ) int_IO_pressure_value[0] |= INT_FLAG_ATTENTION; | |
| 4535 } | |
| 604 | 4536 } |
| 4537 | |
| 623 | 4538 // pressure warnings for reading 2, but only if enabled and pressure value available |
| 4539 if( (char_I_pressure_gas[1] > 0) && !(int_IO_pressure_value[1] & INT_FLAG_NOT_AVAIL) ) | |
| 560 | 4540 { |
| 623 | 4541 overlay unsigned short pressure_value = int_IO_pressure_value[1] & ~INT_FLAG_OUTDATED; |
| 4542 | |
| 4543 if( (char_I_pressure_gas[1] < 6 ) && !(int_O_pressure_need[1] & INT_FLAG_NOT_AVAIL) ) | |
| 560 | 4544 { |
| 623 | 4545 // not a diluent and need available: warning & attention by need |
| 4546 if ( pressure_value <= int_O_pressure_need[1]) | |
| 4547 int_IO_pressure_value[1] |= INT_FLAG_WARNING; | |
| 4548 else if ( pressure_value <= int_O_pressure_need[1] + int_O_pressure_need[1] / 2 ) | |
| 4549 int_IO_pressure_value[1] |= INT_FLAG_ATTENTION; | |
| 560 | 4550 } |
| 4551 else | |
| 4552 { | |
| 623 | 4553 // a diluent or need not available: warning & attention by fixed thresholds |
| 4554 if ( pressure_value <= PRESSURE_LIMIT_WARNING ) int_IO_pressure_value[1] |= INT_FLAG_WARNING; | |
| 4555 else if ( pressure_value <= PRESSURE_LIMIT_ATTENTION ) int_IO_pressure_value[1] |= INT_FLAG_ATTENTION; | |
| 560 | 4556 } |
| 4557 } | |
| 582 | 4558 |
| 623 | 4559 //--- SAC Calculation --------------------------------------------------------------------- |
| 4560 // | |
| 4561 // char_I_SAC_mode =0: disabled | |
| 4562 // =1: SAC from 1st reading | |
| 4563 // =2: SAC from 2nd reading | |
| 4564 // =3: SAC from higher one of both pressure drops (independent double mode) | |
| 4565 // =4: SAC (O2 usage) from 2nd reading without real_pres_respiration term | |
| 4566 | |
| 4567 // set SAC rate to not available by default | |
| 4568 int_O_SAC_measured = 0 + INT_FLAG_NOT_AVAIL; | |
| 4569 | |
| 4570 // get a copy of the current absolute pressure | |
| 4571 pres_respiration_sac = real_pres_respiration; | |
| 4572 | |
| 4573 // set threshold for SAC rate attention | |
| 628 | 4574 max_sac_rate = (deco_info & DECO_MODE) ? char_I_SAC_deco : char_I_SAC_work; |
| 623 | 4575 |
| 4576 // char_I_SAC_deco / char_I_SAC_work are in l/min, max_sac_rate is in 0.1 l/min | |
| 4577 max_sac_rate *= 10; | |
| 4578 | |
| 4579 | |
| 4580 // pre-process SAC mode 3 (independent double) | |
| 4581 if( char_I_SAC_mode == 3 ) | |
| 560 | 4582 { |
| 623 | 4583 overlay unsigned char reading1_gas; |
| 4584 overlay unsigned char reading2_gas; | |
| 4585 overlay unsigned char reading1_tanksize; | |
| 4586 overlay unsigned char reading2_tanksize; | |
| 4587 overlay unsigned short reading1_press; | |
| 4588 overlay unsigned short reading2_press; | |
| 4589 overlay unsigned short reading1_drop; | |
| 4590 overlay unsigned short reading2_drop; | |
| 4591 | |
| 4592 // get gas numbers (1-10) of both readings | |
| 4593 reading1_gas = char_I_pressure_gas[0]; | |
| 4594 reading2_gas = char_I_pressure_gas[1]; | |
| 4595 | |
| 4596 // default to no SAC calculation | |
| 4597 char_I_SAC_mode = 0; | |
| 4598 | |
| 4599 // clear switch advice by default | |
| 4600 deco_info &= ~IND_DOUBLE_SWITCH_FLAG; | |
| 4601 | |
| 4602 // check if both readings are configured and available | |
| 4603 if( reading1_gas ) | |
| 4604 if( reading2_gas ) | |
| 4605 if( !(int_IO_pressure_value[0] & INT_FLAG_NOT_AVAIL) ) | |
| 4606 if( !(int_IO_pressure_value[1] & INT_FLAG_NOT_AVAIL) ) | |
| 4607 if( !(int_I_pressure_drop[0] & INT_FLAG_NOT_AVAIL) ) | |
| 4608 if( !(int_I_pressure_drop[1] & INT_FLAG_NOT_AVAIL) ) | |
| 560 | 4609 { |
| 623 | 4610 // get tank pressures, stripping flags |
| 4611 reading1_press = int_IO_pressure_value[0] & 0x0FFF; // in 0.1 bar | |
| 4612 reading2_press = int_IO_pressure_value[1] & 0x0FFF; // in 0.1 bar | |
| 4613 | |
| 4614 // get pressure drops as integers, stripping flags and shifting right | |
| 4615 // to avoid an overflow when multiplying with the tank size later on | |
| 4616 reading1_drop = (int_I_pressure_drop[0] & 0x0FFF) >> 2; | |
| 4617 reading2_drop = (int_I_pressure_drop[1] & 0x0FFF) >> 2; | |
| 4618 | |
| 4619 // get tank sizes | |
| 4620 reading1_tanksize = char_I_gas_avail_size[reading1_gas-1]; | |
| 4621 reading2_tanksize = char_I_gas_avail_size[reading2_gas-1]; | |
| 4622 | |
| 4623 // set mode to calculate SAC on the reading with the higher absolute drop | |
| 4624 char_I_SAC_mode = (reading1_drop * reading1_tanksize > reading2_drop * reading2_tanksize) ? 1 : 2; | |
| 4625 | |
| 4626 // compute switch advice if pressure (in 0.1 bar) of tank breathed from is | |
| 4627 // more than char_I_max_pres_diff (in bar) below pressure of the other tank. | |
| 4628 if( char_I_SAC_mode == 1 ) | |
| 4629 { | |
| 4630 // breathing from reading 1, switch advice if pressure on reading 1 lower than on 2 | |
| 4631 if( (reading1_press + 10*char_I_max_pres_diff) <= reading2_press ) | |
| 4632 deco_info |= IND_DOUBLE_SWITCH_FLAG; | |
| 4633 } | |
| 4634 else | |
| 4635 { | |
| 4636 // breathing from reading 2, switch advice if pressure on reading 2 lower than on 1 | |
| 4637 if( (reading2_press + 10*char_I_max_pres_diff) <= reading1_press ) | |
| 4638 deco_info |= IND_DOUBLE_SWITCH_FLAG; | |
| 4639 } | |
| 560 | 4640 } |
| 4641 } | |
| 4642 | |
| 623 | 4643 |
| 4644 // pre-process SAC mode 4 (O2 usage by reading 2) | |
| 4645 if( char_I_SAC_mode == 4 ) | |
| 4646 { | |
| 4647 // O2 usage on CCR is independent from absolute pressure | |
| 4648 pres_respiration_sac = 1.0; | |
| 4649 | |
| 4650 // O2 pressure drop is measured via reading 2 | |
| 4651 char_I_SAC_mode = 2; | |
| 4652 | |
| 4653 // reconfigure max SAC rate to O2 consumption attention threshold | |
| 4654 max_sac_rate = O2_CONSUMPTION_LIMIT_ATTENTION; | |
| 4655 } | |
| 4656 | |
| 4657 | |
| 628 | 4658 // select which pressure reading to log |
| 4659 if( char_I_SAC_mode == 1 ) int_O_tank_pressure = int_IO_pressure_value[0]; | |
| 4660 else if( char_I_SAC_mode == 2 ) int_O_tank_pressure = int_IO_pressure_value[1]; | |
| 4661 else int_O_tank_pressure = 0; | |
| 4662 | |
| 4663 // strip flags | |
| 4664 int_O_tank_pressure &= 0x0FFF; | |
| 4665 | |
| 4666 // TODO: decide if log shall be in 0.1 bar of full bar only | |
| 4667 // scale to full bar only | |
| 4668 int_O_tank_pressure /= 10; | |
| 4669 | |
| 4670 | |
| 623 | 4671 // calculate SAC - modes 1 & 2 |
| 4672 if( (char_I_SAC_mode == 1) || (char_I_SAC_mode == 2) ) | |
| 560 | 4673 { |
| 623 | 4674 overlay unsigned char reading_index; |
| 4675 overlay unsigned char reading_gas; | |
| 4676 overlay unsigned char reading_tanksize; | |
| 4677 overlay float reading_drop; | |
| 4678 | |
| 4679 // set index: char_I_SAC_mode = 1 -> reading one, index 0 | |
| 4680 // = 2 -> two, 1 | |
| 4681 reading_index = char_I_SAC_mode - 1; | |
| 4682 | |
| 4683 // get gas number (1-10) | |
| 4684 reading_gas = char_I_pressure_gas[reading_index]; | |
| 4685 | |
| 4686 // check if reading is configured and available | |
| 4687 if( reading_gas ) | |
| 4688 if( !(int_I_pressure_drop[reading_index] & INT_FLAG_NOT_AVAIL) ) | |
| 4689 { | |
| 4690 // get tank size (in liter) | |
| 4691 reading_tanksize = char_I_gas_avail_size[reading_gas-1]; | |
| 4692 | |
| 4693 // get pressure drop as float, stripping flags (in 1/5120 bar/sec) | |
| 4694 reading_drop = (float)(int_I_pressure_drop[reading_index] & 0x0FFF); | |
| 4695 | |
| 4696 // check if pressure drop is within range | |
| 4697 if( !(int_I_pressure_drop[reading_index] & INT_FLAG_OUT_OF_RANGE) ) | |
| 4698 { | |
| 4699 // calculate SAC, 10 is factor to have result in 0.1 liter/min | |
| 4700 // 60 is factor for 60 seconds per 1 minute, | |
| 4701 // 5120 accounts for reading_drop being in 1/5120 bar/sec | |
| 4702 // 10*60/5120 = 60/512 = 15/128 | |
| 4703 float_sac = reading_drop * 15/128 * reading_tanksize / pres_respiration_sac; | |
| 4704 | |
| 4705 // limit result to 999 (99.9 liter/min) | |
| 4706 if ( float_sac >= 998.5 ) | |
| 4707 { | |
| 4708 int_O_SAC_measured = 999 + INT_FLAG_ATTENTION; | |
| 4709 } | |
| 4710 else | |
| 4711 { | |
| 4712 // convert float to integer | |
| 4713 int_O_SAC_measured = (unsigned short)(float_sac + 0.5); | |
| 4714 | |
| 4715 // set attention flag if exceeding SAC threshold, but only if pressure drop is not outdated | |
| 4716 if( !(int_I_pressure_drop[reading_index] & INT_FLAG_OUTDATED) ) | |
| 4717 if( int_O_SAC_measured >= max_sac_rate ) | |
| 4718 { | |
| 4719 int_O_SAC_measured |= INT_FLAG_ATTENTION; | |
| 4720 } | |
| 4721 } | |
| 4722 } | |
| 4723 else | |
| 4724 { | |
| 4725 // pressure drop is out of range, so SAC will be set out of range, too | |
| 4726 int_O_SAC_measured = 999 + INT_FLAG_ATTENTION; | |
| 4727 } | |
| 4728 | |
| 4729 // copy outdated flag from int_I_pressure_drop to int_O_SAC_measured | |
| 4730 if( int_I_pressure_drop[reading_index] & INT_FLAG_OUTDATED ) | |
| 4731 { | |
| 4732 int_O_SAC_measured |= INT_FLAG_OUTDATED; | |
| 4733 } | |
| 4734 } | |
| 4735 } | |
| 4736 } | |
| 4737 #endif | |
| 4738 | |
| 4739 | |
| 4740 ////////////////////////////////////////////////////////////////////////////// | |
| 4741 // convert_gas_needs_to_press | |
| 4742 // | |
| 4743 // Converts gas volumes into pressures and sets respective flags | |
| 4744 // | |
| 4745 // Input: gas_needs_gas_index index of the gas to convert (0-4) | |
| 4746 // gas_volume_need[] needed gas volume in liters | |
| 4747 // char_I_gas_avail_pres[] available gas volume in bar | |
| 4748 // char_I_gas_avail_size[] size of the tanks in liters | |
| 4749 // char_I_pressure_gas[] gas configured on reading 1/2 (TR only) | |
| 4750 // | |
| 4751 // Output: int_O_gas_need_vol[] required gas amount in liters, including flags | |
| 4752 // int_O_gas_need_pres[] required gas amount in bar, including flags | |
| 4753 // int_O_pressure_need[] required gas amount for reading 1/2 (TR only) | |
| 4754 // | |
| 4755 static void convert_gas_needs_to_press(void) | |
| 4756 { | |
| 4757 | |
| 4758 // just to make the code more readable... | |
| 4759 i = gas_needs_gas_index; | |
| 4760 | |
| 4761 if( gas_volume_need[i] >= 65534.5 ) | |
| 4762 { | |
| 4763 int_O_gas_need_vol[i] = 65535; // clip at 65535 liters | |
| 4764 int_O_gas_need_pres[i] = 999 | INT_FLAG_WARNING | INT_FLAG_HIGH; // 999 bar + warning flag + >999 flag | |
| 560 | 4765 } |
| 4766 else | |
| 4767 { | |
| 623 | 4768 overlay unsigned short int_pres_warn; |
| 4769 overlay unsigned short int_pres_attn; | |
| 4770 | |
| 4771 // set warning and attention thresholds | |
| 4772 int_pres_warn = 10.0 * (unsigned short)char_I_gas_avail_pres[i]; | |
| 628 | 4773 int_pres_attn = GAS_NEEDS_LIMIT_ATTENTION * int_pres_warn; |
| 623 | 4774 |
| 4775 // convert ascent gas volume need from float to integer [in liter] | |
| 4776 int_O_gas_need_vol[i] = (unsigned short)gas_volume_need[i]; | |
| 4777 | |
| 4778 // compute how much pressure in the tank will be needed [in bar] | |
| 4779 int_O_gas_need_pres[i] = (unsigned short)( gas_volume_need[i] / char_I_gas_avail_size[i] + 0.999 ); | |
| 4780 | |
| 4781 // limit result to 999 bar because of display constraints | |
| 4782 if( int_O_gas_need_pres[i] > 999 ) int_O_gas_need_pres[i] = 999 | INT_FLAG_HIGH; | |
| 4783 | |
| 4784 // set flags for fast evaluation by dive mode | |
| 4785 if ( int_O_gas_need_pres[i] == 0 ) int_O_gas_need_pres[i] |= INT_FLAG_ZERO; | |
| 4786 else if ( int_O_gas_need_pres[i] >= int_pres_warn ) int_O_gas_need_pres[i] |= INT_FLAG_WARNING; | |
| 4787 else if ( int_O_gas_need_pres[i] >= int_pres_attn ) int_O_gas_need_pres[i] |= INT_FLAG_ATTENTION; | |
| 560 | 4788 } |
| 4789 | |
| 623 | 4790 // set invalid flag if there is an overflow in the stops table |
| 628 | 4791 if( deco_warnings & DECO_WARNING_INCOMPLETE ) int_O_gas_need_pres[i] |= INT_FLAG_INVALID; |
| 560 | 4792 |
| 604 | 4793 #ifdef _rx_functions |
| 4794 // only for OSTC TR model with TR functions enabled | |
| 623 | 4795 if( main_status & TR_FUNCTIONS ) |
| 560 | 4796 { |
| 623 | 4797 // char_I_pressure_gas[] uses gas indexes from 1-10, loop variable i runs from 0 to 4 |
| 4798 overlay unsigned char j = i+1; | |
| 4799 | |
| 4800 // check if the current gas is configured on pressure reading 1 or 2 | |
| 4801 if( (char_I_pressure_gas[0] == j) || (char_I_pressure_gas[1] == j) ) | |
| 560 | 4802 { |
| 623 | 4803 // get a copy of the required pressure in full bar |
| 4804 overlay unsigned short int_pres_need = int_O_gas_need_pres[i]; | |
| 4805 | |
| 4806 // strip all flags | |
| 4807 int_pres_need &= 1023; | |
| 4808 | |
| 4809 // limit to 400 bar and multiply by 10 to get required pressure in 0.1 bar | |
| 4810 int_pres_need = (int_pres_need > 400) ? 4000 | INT_FLAG_OUT_OF_RANGE : 10 * int_pres_need; | |
| 4811 | |
| 4812 // tag as not available if there is an overflow in the stops table | |
| 628 | 4813 if( deco_warnings & DECO_WARNING_INCOMPLETE ) int_pres_need |= INT_FLAG_NOT_AVAIL; |
| 623 | 4814 |
| 4815 // copy to reading data (in both readings the same gas could be configured) | |
| 4816 if( char_I_pressure_gas[0] == j ) int_O_pressure_need[0] = int_pres_need; | |
| 4817 if( char_I_pressure_gas[1] == j ) int_O_pressure_need[1] = int_pres_need; | |
| 4818 } | |
| 4819 } // TR functions | |
| 604 | 4820 #endif |
| 0 | 4821 } |
| 4822 | |
| 623 | 4823 |
| 4824 ////////////////////////////////////////////////////////////////////////////// | |
| 4825 // convert the real CNS value to integer | |
| 4826 // | |
| 4827 // Input CNS_fraction_real current CNS value as float | |
| 4828 // | |
| 4829 // Output: int_O_CNS_current current CNS value as integer including flags | |
| 4830 // | |
| 4831 static void convert_cur_CNS_for_display(void) | |
| 4832 { | |
| 4833 // convert to integer | |
| 4834 float_value = CNS_fraction_real; convert_float_to_int(); int_O_CNS_current = int_value; | |
| 4835 | |
| 4836 // set warning & attention flags | |
| 628 | 4837 if ( int_O_CNS_current >= CNS_LIMIT_WARNING ) int_O_CNS_current |= INT_FLAG_WARNING; |
| 4838 else if ( int_O_CNS_current >= CNS_LIMIT_ATTENTION ) int_O_CNS_current |= INT_FLAG_ATTENTION; | |
| 623 | 4839 } |
| 4840 | |
| 4841 | |
| 0 | 4842 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 4843 // convert the simulated CNS value to integer |
| 4844 // | |
| 4845 // Input: CNS_fraction_sim CNS value after predicted ascent in float | |
| 4846 // | |
| 4847 // Output: int_sim_CNS_fraction CNS value after predicted ascent in integer | |
| 4848 // including flags, will be routed to | |
| 4849 // int_O_{normal,alternative}_CNS_fraction | |
| 4850 // | |
| 604 | 4851 static void convert_sim_CNS_for_display(void) |
| 582 | 4852 { |
| 623 | 4853 // convert to integer |
| 4854 float_value = CNS_fraction_sim; convert_float_to_int(); int_sim_CNS_fraction = int_value; | |
| 4855 | |
| 4856 // set warning & attention flags | |
| 628 | 4857 if ( int_sim_CNS_fraction >= CNS_LIMIT_WARNING ) int_sim_CNS_fraction |= INT_FLAG_WARNING; |
| 4858 else if ( int_sim_CNS_fraction >= CNS_LIMIT_ATTENTION ) int_sim_CNS_fraction |= INT_FLAG_ATTENTION; | |
| 604 | 4859 |
| 4860 // set invalid flag if there is an overflow in the stops table | |
| 628 | 4861 if ( deco_warnings & DECO_WARNING_INCOMPLETE ) int_sim_CNS_fraction |= INT_FLAG_INVALID; |
| 604 | 4862 } |
| 4863 | |
| 623 | 4864 |
| 604 | 4865 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 4866 // convert the saturation value of the leading tissue to integer |
| 4867 // | |
| 4868 // Input lead_supersat saturation of the leading tissue | |
| 4869 // lead_tissue number of the leading tissue | |
| 4870 // char_I_GF_High_percentage GF high factor | |
| 4871 // | |
| 4872 // Output: int_O_lead_supersat saturation of the leading tissue | |
| 4873 // char_O_lead_tissue number of the leading tissue | |
| 4874 // | |
| 4875 // Modified: deco_warnings deco engine warnings vector | |
| 4876 // | |
| 4877 static void convert_sat_for_display(void) | |
| 604 | 4878 { |
| 623 | 4879 // convert supersaturation of the leading tissue to int_O_lead_supersat in % (1.0 = 100%) |
| 604 | 4880 // limit to 255 because of constraints in ghostwriter code |
| 623 | 4881 if ( lead_supersat <= 0.000 ) int_O_lead_supersat = 0; |
| 4882 else if ( lead_supersat > 2.545 ) int_O_lead_supersat = 255; | |
| 4883 else int_O_lead_supersat = (unsigned short)(100 * lead_supersat + 0.5); | |
| 4884 | |
| 4885 // set warning & attention flags | |
| 4886 if( int_O_lead_supersat > 100 ) | |
| 604 | 4887 { |
| 623 | 4888 int_O_lead_supersat |= INT_FLAG_WARNING; // make GF factor shown in red |
| 4889 deco_warnings |= DECO_WARNING_OUTSIDE; // make depth shown in red | |
| 4890 } | |
| 4891 else if( (char_I_deco_model != 0) && (int_O_lead_supersat > char_I_GF_High_percentage) | |
| 4892 || (char_I_deco_model == 0) && (int_O_lead_supersat > 99 ) ) | |
| 4893 { | |
| 4894 int_O_lead_supersat |= INT_FLAG_ATTENTION; // make GF factor shown in yellow | |
| 4895 deco_warnings |= DECO_ATTENTION_OUTSIDE; // make depth shown in yellow | |
| 604 | 4896 } |
| 4897 | |
| 4898 // export also the number of the leading tissue | |
| 623 | 4899 char_O_lead_tissue = lead_tissue; |
| 604 | 4900 } |
| 4901 | |
| 623 | 4902 |
| 604 | 4903 ////////////////////////////////////////////////////////////////////////////// |
| 623 | 4904 // convert the ceiling value to integer |
| 4905 // | |
| 4906 // Input: ceiling minimum depth permitted in float | |
| 4907 // | |
| 628 | 4908 // Output: int_O_ceiling minimum depth permitted in mbar (cm) |
| 623 | 4909 // |
| 4910 // Modified: deco_info deco engine information vector | |
| 4911 // | |
| 604 | 4912 static void convert_ceiling_for_display(void) |
| 4913 { | |
| 4914 // Convert ceiling to int_O_ceiling in mbar relative pressure. | |
| 4915 // Round up to next 10 cm so that the ceiling disappears only | |
| 4916 // when the ceiling limit is really zero. This will coincident | |
| 4917 // with TTS switching back to NDL time. | |
| 628 | 4918 // The +1.5 term figures in the conversion factor of 10.015 m/bar |
| 4919 // which is used inside the deco engine but not outside of it. | |
| 623 | 4920 if ( ceiling <= 0.0 ) int_O_ceiling = 0; |
| 4921 else if ( ceiling > 16.0 ) int_O_ceiling = 16000; | |
| 628 | 4922 else int_O_ceiling = (unsigned short)(ceiling * (1000+1.5) + 9); |
| 604 | 4923 |
| 4924 // set/reset ceiling flag | |
| 623 | 4925 if ( int_O_ceiling ) deco_info |= DECO_CEILING; |
| 4926 else deco_info &= ~DECO_CEILING; | |
| 0 | 4927 } |
| 4928 | |
| 623 | 4929 |
| 0 | 4930 ////////////////////////////////////////////////////////////////////////////// |
| 582 | 4931 // push_tissues_to_vault & pull_tissues_from_vault |
| 4932 // | |
| 4933 // ATTENTION: Do not use from inside the deco engine! | |
| 4934 // The vault is exclusively reserved to back-up and restore the real | |
| 4935 // tissues and related data when entering / leaving simulation mode! | |
| 4936 // | |
| 623 | 4937 // Input/Output: CNS_fraction_real current real CNS value |
| 4938 // char_O_deco_warnings deco engine warnings vector | |
| 4939 // real_pres_tissue_N2[] partial pressure of N2 in real tissues | |
| 4940 // real_pres_tissue_He[] partial pressure of He in real tissues | |
| 4941 // | |
| 4942 // Output: int_O_CNS_current current CNS value as integer including flags | |
| 4943 // | |
| 604 | 4944 static void push_tissues_to_vault(void) |
| 0 | 4945 { |
| 623 | 4946 // store the current CNS value and deco warnings |
| 4947 vault_CNS_fraction_real = CNS_fraction_real; | |
| 4948 vault_deco_warnings = char_O_deco_warnings; | |
| 4949 vault_deco_info = char_O_deco_info; | |
| 4950 | |
| 4951 // store the tissue pressures | |
| 4952 for( i = 0; i < NUM_COMP; i++ ) | |
| 582 | 4953 { |
| 623 | 4954 vault_pres_tissue_N2[i] = real_pres_tissue_N2[i]; |
| 4955 #ifdef _helium | |
| 4956 vault_pres_tissue_He[i] = real_pres_tissue_He[i]; | |
| 4957 #else | |
| 4958 vault_pres_tissue_He[i] = 0; | |
| 4959 #endif | |
| 582 | 4960 } |
| 0 | 4961 } |
| 4962 | |
| 604 | 4963 static void pull_tissues_from_vault(void) |
| 0 | 4964 { |
| 623 | 4965 // restore the CNS value and deco warnings |
| 4966 CNS_fraction_real = vault_CNS_fraction_real; | |
| 4967 char_O_deco_warnings = vault_deco_warnings; | |
| 4968 char_O_deco_info = vault_deco_info; | |
| 4969 | |
| 4970 // convert the CNS value to integer | |
| 4971 convert_cur_CNS_for_display(); | |
| 4972 | |
| 4973 // restore the tissue pressures | |
| 4974 for( i = 0; i < NUM_COMP; i++ ) | |
| 582 | 4975 { |
| 623 | 4976 real_pres_tissue_N2[i] = vault_pres_tissue_N2[i]; |
| 4977 #ifdef _helium | |
| 4978 real_pres_tissue_He[i] = vault_pres_tissue_He[i]; | |
| 4979 #else | |
| 4980 real_pres_tissue_He[i] = 0; | |
| 4981 #endif | |
| 582 | 4982 } |
| 0 | 4983 } |
| 4984 | |
| 623 | 4985 |
| 0 | 4986 ////////////////////////////////////////////////////////////////////////////// |
| 4987 // | |
| 4988 #ifndef CROSS_COMPILE | |
| 4989 void main() {} | |
| 4990 #endif |