Mercurial > public > hwos_code
annotate src/p2_deco.c @ 566:3febf1cd1bf4
Fix anomalie when toggling ppO2 warning levels in ccr and pscr mode.
| author | heinrichsweikamp |
|---|---|
| date | Thu, 08 Feb 2018 10:18:15 +0100 |
| parents | b7eb98dbd800 |
| children | 4ce70e3f00be |
| rev | line source |
|---|---|
| 0 | 1 // ************************************************************** |
| 560 | 2 // p2_deco.c REFACTORED VERSION V2.95a2 |
| 0 | 3 // |
| 4 // Created on: 12.05.2009 | |
| 560 | 5 // Author: heinrichs weikamp, contributions by Ralph Lembcke and others |
| 0 | 6 // |
| 7 // ************************************************************** | |
| 8 | |
| 9 ////////////////////////////////////////////////////////////////////////////// | |
| 10 // OSTC - diving computer code | |
| 11 // Copyright (C) 2011 HeinrichsWeikamp GbR | |
| 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 | |
| 15 // the Free Software Foundation, either version 3 of the License, or | |
| 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 | |
| 20 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 21 // GNU General Public License for more details. | |
| 22 // | |
| 23 // You should have received a copy of the GNU General Public License | |
| 24 // along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 25 // | |
| 26 ////////////////////////////////////////////////////////////////////////////// | |
| 27 | |
| 28 // history: | |
| 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 |
| 33 // 03/13/25 v101: CNS_fraction calculation | |
| 34 // 03/13/26 v101: optimization of tissue calc routines | |
| 35 // 07/xx/08 v102a: debug of bottom time routine | |
| 560 | 36 // 09/xx/08 v102d: Gradient Factor Model implementation |
| 0 | 37 // 10/10/08 v104: renamed to build v103 for v118 stable |
| 38 // 10/14/08 v104: integration of char_I_depth_last_deco for Gradient Model | |
| 39 // 03/31/09 v107: integration of FONT Incon24 | |
| 40 // 05/23/10 v109: 5 gas changes & 1 min timer | |
| 41 // 07/13/10 v110: cns vault added | |
| 42 // 12/25/10 v110: split in three files (deco.c, main.c, definitions.h) | |
| 43 // 2011/01/20: [jDG] Create a common file included in ASM and C code. | |
| 44 // 2011/01/24: [jDG] Make ascenttime an short. No more overflow! | |
| 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. | |
| 50 // 2011/04/15: [jDG] Store low_depth in 32bits (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 | |
| 560 | 61 // 2012/10/05: [jDG] Better gas_volumes accuracy (average depth, switch between stop). |
| 0 | 62 // 2013/03/05: [jDG] Should vault low_depth too. |
| 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
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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. | |
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0e9dcdcf03c1
FIX NDL prediction error with Buhlmann model: might be desaturating too fast.
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67 // 2014/06/29: [mH] Compute int_O_ceiling |
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0e9dcdcf03c1
FIX NDL prediction error with Buhlmann model: might be desaturating too fast.
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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 | |
| 0 | 72 // |
| 73 // | |
| 74 // Literature: | |
| 313 | 75 // Buhlmann, Albert: Tauchmedizin; 4. Auflage [2002]; |
| 0 | 76 // Schr"oder, Kai & Reith, Steffen; 2000; S"attigungsvorg"ange beim Tauchen, das Modell ZH-L16, Funktionsweise von Tauchcomputern; http://www.achim-und-kai.de/kai/tausim/saett_faq |
| 77 // Morrison, Stuart; 2000; DIY DECOMPRESSION; http://www.lizardland.co.uk/DIYDeco.html | |
| 78 // Balthasar, Steffen; Dekompressionstheorie I: Neo Haldane Modelle; http://www.txfreak.de/dekompressionstheorie_1.pdf | |
| 79 // Baker, Erik C.; Clearing Up The Confusion About "Deep Stops" | |
| 80 // Baker, Erik C.; Understanding M-values; http://www.txfreak.de/understanding_m-values.pdf | |
| 81 // | |
| 82 // | |
| 83 | |
| 84 // ********************* | |
| 85 // ** I N C L U D E S ** | |
| 86 // ********************* | |
| 87 #include <math.h> | |
| 88 | |
| 89 // *********************************************** | |
| 90 // ** V A R I A B L E S D E F I N I T I O N S ** | |
| 91 // *********************************************** | |
| 92 | |
| 93 #include "p2_definitions.h" | |
| 560 | 94 #define TEST_MAIN |
| 0 | 95 #include "shared_definitions.h" |
| 96 | |
| 560 | 97 |
| 98 // ambient pressure at different mountain heights | |
| 99 #define P_ambient_1000m 0.880 // [bar] based on 990 hPa and 20°C at sea level, 15°C at altitude | |
| 100 #define P_ambient_2000m 0.782 // [bar] | |
| 101 #define P_ambient_3000m 0.695 // [bar] | |
| 102 | |
| 103 // ambient pressure in aircraft cabin during flying - worst case according to Buhlmann | |
| 104 #define P_ambient_fly 0.600 // [bar], 0.600 bar is the value used by Buhlmann for his flying-after-diving calculations | |
| 105 // 0.735 bar is a typical cabin pressure for nowadays commercial jet aircrafts | |
| 106 // ----- | |
| 107 // 0.135 bar safety margin | |
| 108 | |
| 109 // constants and factors | |
| 110 #define ppWater 0.0627 // water vapor partial pressure in the lungs | |
| 111 #define METER_TO_BAR 0.09985 // conversion factor | |
| 112 #define BAR_TO_METER 10.0150 // conversion factor (1.0/METER_TO_BAR) | |
| 113 #define SURFACE_DESAT_FACTOR 0.7042 // surface desaturation safety factor | |
| 114 #define HYST 1.0E-06 // threshold for tissue graphics on-gassing / off-gassing visualization | |
| 115 | |
| 116 // thresholds | |
| 117 #define GF_warning_threshold 100 // threshold for GF warning (attention threshold is current GF_high) | |
| 118 #define CNS_warning_threshold 100 // threshold for CNS warning | |
| 119 #define CNS_prewarning_threshold 70 // threshold for CNS attention | |
| 120 #define ppO2_prewarn_threshold 120 // threshold for ppO2 attention (master warnings come through options_table.asm) | |
| 121 #define GAS_NEEDS_ATTENTION_THRESHOLD 0.70 // threshold for gas needs attention | |
| 122 | |
| 123 // deco engine states and modes - char_O_deco_status | |
| 124 #define DECO_STATUS_MASK 0x03 | |
| 125 #define DECO_STATUS_START 0x00 | |
| 126 #define DECO_STATUS_FINISHED 0x00 | |
| 127 #define DECO_STATUS_STOPS 0x01 | |
| 128 #define DECO_STATUS_ASCENT 0x02 | |
| 129 #define DECO_STATUS_INIT 0x03 | |
| 130 | |
| 131 #define DECO_MODE_MASK 0x0C | |
| 132 #define DECO_MODE_LOOP 0x04 | |
| 133 #define DECO_MODE_CCR 0x04 // to be used with == operator in combination with DECO_MODE_MASK only! | |
| 134 #define DECO_MODE_PSCR 0x08 | |
| 135 | |
| 136 #define DECO_PLAN_ALTERNATE 0x10 | |
| 137 #define DECO_CNS_CALCULATE 0x20 | |
| 138 #define DECO_VOLUME_CALCULATE 0x40 | |
| 139 #define DECO_ASCENT_DELAYED 0x80 | |
| 140 | |
| 141 // deco engine states and modes - char_O_main_status | |
| 142 //#define DECO_MODE_MASK 0x0C | |
| 143 //#define DECO_MODE_LOOP 0x04 | |
| 144 //#define DECO_MODE_CCR 0x04 // to be used with == operator in combination with DECO_MODE_MASK only! | |
| 145 //#define DECO_MODE_PSCR 0x08 | |
| 146 #define DECO_GASCHANGE_OVRD 0x10 | |
| 147 #define DECO_BOTTOM_CALCULATE 0x40 | |
| 148 | |
| 149 | |
| 150 // deco engine warnings | |
| 151 #define DECO_WARNING_IBCD 0x01 | |
| 152 #define DECO_WARNING_IBCD_lock 0x02 | |
| 153 #define DECO_WARNING_MBUBBLES 0x04 | |
| 154 #define DECO_WARNING_MBUBBLES_lock 0x08 | |
| 155 #define DECO_WARNING_OUTSIDE 0x10 | |
| 156 #define DECO_WARNING_OUTSIDE_lock 0x20 | |
| 157 #define DECO_WARNING_STOPTABLE_OVERFLOW 0x40 | |
| 158 #define DECO_FLAG 0x80 | |
| 159 | |
| 160 // flags used with integer numbers | |
| 161 #define INT_FLAG_INVALID 0x0400 | |
| 162 #define INT_FLAG_ZERO 0x0800 | |
| 163 #define INT_FLAG_LOW 0x1000 | |
| 164 #define INT_FLAG_HIGH 0x2000 | |
| 165 #define INT_FLAG_PREWARNING 0x4000 | |
| 166 #define INT_FLAG_WARNING 0x8000 | |
| 167 | |
| 168 | |
| 0 | 169 |
| 170 // ************************* | |
| 171 // ** P R O T O T Y P E S ** | |
| 172 // ************************* | |
| 173 | |
| 174 static void calc_hauptroutine(void); | |
| 175 static void calc_hauptroutine_data_input(void); | |
| 176 static void calc_hauptroutine_update_tissues(void); | |
| 177 static void calc_hauptroutine_calc_deco(void); | |
| 560 | 178 static void calc_tissue(void); |
| 179 static void calc_limit(void); | |
| 180 static void calc_nullzeit(void); | |
| 181 static void calc_ascenttime(void); | |
| 182 static void calc_dive_interval(void); | |
| 183 static void calc_gradient_factor(void); | |
| 184 static void calc_wo_deco_step_1_min(void); | |
| 185 static void calc_desaturation_time(void); | |
| 186 | |
| 187 static void sim_extra_time(void); | |
| 0 | 188 static void sim_ascent_to_first_stop(void); |
| 560 | 189 static void sim_limit(PARAMETER float GF_current); |
| 190 | |
| 191 static void update_startvalues(void); | |
| 0 | 192 static void gas_switch_set(void); |
| 560 | 193 static void compute_CNS_for_display(void); |
| 194 | |
| 195 static void clear_deco_table(void); | |
| 196 static void clear_tissue(void); | |
| 197 | |
| 198 static unsigned char gas_find_better(void); | |
| 0 | 199 static unsigned char calc_nextdecodepth(void); |
| 560 | 200 static unsigned char update_deco_table(PARAMETER unsigned char time_increment); |
| 201 | |
| 0 | 202 |
| 203 //---- Bank 5 parameters ----------------------------------------------------- | |
| 204 #ifndef UNIX | |
| 205 # pragma udata bank5=0x500 | |
| 206 #endif | |
| 207 | |
| 560 | 208 // general deco parameters |
| 209 | |
| 210 static float GF_low; // initialized from deco parameters, constant during all computations | |
| 211 static float GF_high; // initialized from deco parameters, constant during all computations | |
| 212 static float GF_delta; // initialized from deco parameters, constant during all computations | |
| 213 static float locked_GF_step_norm; // GF_delta / low_depth_norm in normal plan | |
| 214 static float locked_GF_step_alt; // GF_delta / low_depth_alt in alternative plan | |
| 215 | |
| 216 static float low_depth_norm; // Depth of deepest stop in normal plan | |
| 217 static float low_depth_alt; // Depth of deepest stop in alternative plan | |
| 218 | |
| 219 static float float_ascent_speed; // ascent speed from options_table (1.0 .. 10.0 m/min) | |
| 220 static float float_saturation_multiplier; // safety factor for on-gassing rates | |
| 221 static float float_desaturation_multiplier; // safety factor for off-gassing rates | |
| 222 static float float_deco_distance; // additional depth below stop depth for tissue, CNS and gas volume calculation | |
| 223 | |
| 224 | |
| 225 // real context: what we are doing now. | |
| 226 | |
| 227 static float calc_lead_tissue_limit; // minimum tolerated ambient pressure by Buhlmann model | |
| 228 static float CNS_fraction; // current CNS (1.00 = 100%) | |
| 229 | |
| 230 static unsigned short deco_tissue_vector; // 32 bit vector to memories all tissues that are in decompression | |
| 231 static unsigned short IBCD_tissue_vector; // 32 bit vector to memories all tissues that experience IBCD | |
| 232 | |
| 233 // simulation context: used to predict ascent. | |
| 234 | |
| 235 static float sim_lead_tissue_limit; // minimum tolerated ambient pressure by Buhlmann model | |
| 236 static float CNS_sim_norm_fraction; // CNS at end of dive in normal plan | |
| 237 static float CNS_sim_alt_fraction; // CNS at end of dive in alternative plan | |
| 238 | |
| 239 static unsigned char temp_depth_limit; // depth of next stop in meters, used in deco calculations | |
| 240 static unsigned char sim_lead_tissue_no; // Leading compartment number | |
| 241 static unsigned char split_N2_He[NUM_COMP]; // used for calculating the desaturation time | |
| 242 | |
| 243 | |
| 244 // stops table | |
| 245 | |
| 246 static unsigned char internal_deco_depth[NUM_STOPS]; // depth of the stop | |
| 247 static unsigned char internal_deco_time[NUM_STOPS]; // duration of the stop | |
| 248 static unsigned char internal_deco_gas[NUM_STOPS]; // gas used at the stop | |
| 249 | |
| 250 | |
| 251 // transfer variables between calc_desaturation_time() and calc_desaturation_time_helper() | |
| 252 | |
| 253 static float desat_factor; // used to cache a pre-computed factor | |
| 254 static float var_ht; // buffer for a half-time factor | |
| 255 static float pres_target; // target pressure for a compartment | |
| 256 static float pres_actual; // current pressure of the compartment | |
| 257 static unsigned short short_time; // time it takes for the compartment to reach the target pressure | |
| 258 | |
| 259 // transfer variables between gas_volumes() and gas_volumes_helper() | |
| 260 static float float_depth; // depth of the stop or half-way point | |
| 261 static float float_time; // duration of the stop or ascent phase | |
| 262 static float volume; // computed volume of gas | |
| 263 static unsigned char usage; // gas usage in l/min | |
| 264 | |
| 265 | |
| 266 // 44 byte free space left in this bank | |
| 267 | |
| 0 | 268 |
| 269 //---- Bank 6 parameters ----------------------------------------------------- | |
| 270 #ifndef UNIX | |
| 271 # pragma udata bank6=0x600 | |
| 272 #endif | |
| 273 | |
| 560 | 274 // indexing and sequencing |
| 275 | |
| 276 static unsigned char ci; // used as index to the Buhlmann tables | |
| 277 static unsigned char twosectimer = 0; // used for timing the tissue updating | |
| 278 static unsigned char tissue_increment; // Selector for real/simulated tissues and time increment | |
| 279 | |
| 280 | |
| 281 // environmental and gas data | |
| 282 | |
| 283 static float pres_respiration; // current depth in absolute pressure | |
| 284 static float pres_surface; // absolute pressure at the surface | |
| 285 static float temp_deco; // simulated current depth in abs.pressure, used for deco calculations | |
| 286 | |
| 287 static unsigned char bottom_depth; // bottom depth in meters, used by CNS and gas needs calculation | |
| 288 | |
| 289 static float O2_ratio; // real breathed gas oxygen ratio | |
| 290 static float N2_ratio; // real breathed gas nitrogen ratio | |
| 291 static float He_ratio; // real breathed gas helium ratio | |
| 292 | |
| 293 static float calc_O2_ratio; // simulated breathed gas oxygen ratio | |
| 294 static float calc_N2_ratio; // simulated breathed gas nitrogen ratio | |
| 295 static float calc_He_ratio; // simulated breathed gas helium ratio | |
| 296 | |
| 297 static float O2_ppO2; // ppO2 - calculated for pure oxygen at current depth | |
| 298 static float pSCR_ppO2; // ppO2 - calculated for breathed from pSCR loop | |
| 299 static float pure_ppO2; // ppO2 - calculated for breathed in OC mode | |
| 300 | |
| 301 static unsigned char char_actual_ppO2; // ppO2 - assumed to be breathed, as integer 100 = 1.00 bar | |
| 302 | |
| 303 static float breathed_ppO2; // partial pressure of breathed oxygen | |
| 304 static float ppN2; // partial pressure of breathed nitrogen | |
| 305 static float ppHe; // partial pressure of breathed helium | |
| 306 | |
| 307 | |
| 308 // Buhlmann model parameters | |
| 309 | |
| 310 static float var_N2_a; // Buhlmann a, for current N2 tissue | |
| 311 static float var_N2_b; // Buhlmann b, for current N2 tissue | |
| 312 static float var_He_a; // Buhlmann a, for current He tissue | |
| 313 static float var_He_b; // Buhlmann b, for current He tissue | |
| 314 static float var_N2_e; // exposition, for current N2 tissue | |
| 315 static float var_He_e; // exposition, for current He tissue | |
| 316 static float var_N2_ht; // half-time for current N2 tissue | |
| 317 static float var_He_ht; // half-time for current N2 tissue | |
| 318 | |
| 319 | |
| 320 // gas switch history | |
| 321 | |
| 322 static unsigned char sim_gas_first_used; // Number of first used gas, for bottom segment | |
| 323 static unsigned char sim_gas_last_used; // number of last used gas | |
| 324 static unsigned char sim_gas_last_depth; // change depth of last used gas | |
| 325 | |
| 326 | |
| 327 // vault to back-up & restore tissue data | |
| 328 | |
| 329 static float pres_tissue_N2_vault[NUM_COMP]; // stores the nitrogen tissue pressures | |
| 330 static float pres_tissue_He_vault[NUM_COMP]; // stores the helium tissue pressures | |
| 331 static float low_depth_norm_vault; // stores a parameter of the GF model for normal plan | |
| 332 static float low_depth_alt_vault; // stores a parameter of the GF model for alternative plan | |
| 333 static float cns_vault_float; // stores current CNS (float representation) | |
| 334 | |
| 335 static unsigned int cns_vault_int; // stores current CNS (integer representation) | |
| 336 static unsigned char deco_warnings_vault; // stores warnings status | |
| 337 | |
| 338 | |
| 339 // auxiliary variables for local data buffering | |
| 340 | |
| 341 static float N2_equilibrium; // used for N2 tissue graphics scaling | |
| 342 static float temp_tissue; // auxiliary variable to buffer tissue pressures | |
| 343 | |
| 344 | |
| 345 // 6 byte free space left in this bank | |
| 346 | |
| 0 | 347 |
| 348 //---- Bank 7 parameters ----------------------------------------------------- | |
| 349 #ifndef UNIX | |
| 350 # pragma udata bank7=0x700 | |
| 351 #endif | |
| 560 | 352 |
| 353 // Keep order and position of the variables in bank 7 as they are backed-up to & restored from EEPROM | |
| 354 | |
| 355 float pres_tissue_N2[NUM_COMP]; // 16 floats = 64 bytes | |
| 356 float pres_tissue_He[NUM_COMP]; // 16 floats = 64 bytes | |
| 357 float sim_pres_tissue_N2[NUM_COMP]; // 16 floats = 64 bytes | |
| 358 float sim_pres_tissue_He[NUM_COMP]; // 16 floats = 64 bytes | |
| 359 | |
| 0 | 360 |
| 361 //---- Bank 8 parameters ----------------------------------------------------- | |
| 362 #ifndef UNIX | |
| 363 # pragma udata overlay bank8=0x800 | |
| 560 | 364 |
| 365 static char md_pi_subst[256]; // Overlay C-code data stack here, too. | |
| 366 | |
| 367 # define C_STACK md_pi_subst | |
| 0 | 368 #endif |
| 369 | |
| 370 // Back to bank6 for further tmp data | |
| 371 #ifndef UNIX | |
| 372 # pragma udata bank6 | |
| 373 #endif | |
| 374 | |
| 375 ////////////////////////////////////////////////////////////////////////////// | |
| 376 ////////////////////////////////////////////////////////////////////////////// | |
| 377 ///////////////////////////// THE LOOKUP TABLES ////////////////////////////// | |
| 378 ////////////////////////////////////////////////////////////////////////////// | |
| 379 ////////////////////////////////////////////////////////////////////////////// | |
| 380 // | |
| 381 // End of PROM code is 17F00, So push tables on PROM top... | |
| 382 // | |
| 383 #ifndef UNIX | |
| 560 | 384 # pragma romdata Buhlmann_tables = 0x1DD00 // Needs to be in UPPER bank. |
| 0 | 385 #endif |
| 386 | |
| 560 | 387 rom const float Buhlmann_ab[4*16] = { |
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388 // Data ZH-L16C, from Bühlmann Tauchmedizin 2002, option 1a (4mn) |
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389 // a for N2 b for N2 a of He b for He |
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390 1.2599, 0.5050, 1.7424, 0.4245, |
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391 1.0000, 0.6514, 1.3830, 0.5747, |
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392 0.8618, 0.7222, 1.1919, 0.6527, |
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393 0.7562, 0.7825, 1.0458, 0.7223, |
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394 0.6200, 0.8126, 0.9220, 0.7582, |
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395 0.5043, 0.8434, 0.8205, 0.7957, |
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396 0.4410, 0.8693, 0.7305, 0.8279, |
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397 0.4000, 0.8910, 0.6502, 0.8553, |
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398 0.3750, 0.9092, 0.5950, 0.8757, |
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399 0.3500, 0.9222, 0.5545, 0.8903, |
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400 0.3295, 0.9319, 0.5333, 0.8997, |
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|
401 0.3065, 0.9403, 0.5189, 0.9073, |
|
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heinrichsweikamp
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|
402 0.2835, 0.9477, 0.5181, 0.9122, |
|
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heinrichsweikamp
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|
403 0.2610, 0.9544, 0.5176, 0.9171, |
|
06e9370c6d75
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heinrichsweikamp
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519
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|
404 0.2480, 0.9602, 0.5172, 0.9217, |
|
06e9370c6d75
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heinrichsweikamp
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|
405 0.2327, 0.9653, 0.5119, 0.9267 |
|
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|
406 }; |
|
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|
407 |
| 560 | 408 rom const float Buhlmann_ht[2*16] = { |
| 409 // Compartment half-life, in minute | |
| 410 //--- N2 ---- He ---------------------- | |
|
521
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|
411 4.0, 1.51, |
|
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|
412 8.0, 3.02, |
|
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|
413 12.5, 4.72, |
|
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519
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|
414 18.5, 6.99, |
|
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parents:
519
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|
415 27.0, 10.21, |
|
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|
416 38.3, 14.48, |
|
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|
417 54.3, 20.53, |
|
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|
418 77.0, 29.11, |
|
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|
419 109.0, 41.20, |
|
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|
420 146.0, 55.19, |
|
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|
421 187.0, 70.69, |
|
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parents:
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|
422 239.0, 90.34, |
|
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heinrichsweikamp
parents:
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|
423 305.0, 115.29, |
|
06e9370c6d75
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parents:
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|
424 390.0, 147.42, |
|
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heinrichsweikamp
parents:
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|
425 498.0, 188.24, |
|
06e9370c6d75
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heinrichsweikamp
parents:
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|
426 635.0, 240.03 |
|
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|
427 }; |
|
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|
428 |
|
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|
429 rom const float e2secs[2*16] = { |
| 560 | 430 // result of 1 - 2^(-1/(2sec*HT)) |
|
521
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431 //---- N2 ------------- He ------------ |
|
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432 5.75958E-03, 1.51848E-02, |
|
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parents:
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|
433 2.88395E-03, 7.62144E-03, |
|
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parents:
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|
434 1.84669E-03, 4.88315E-03, |
|
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heinrichsweikamp
parents:
519
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|
435 1.24813E-03, 3.29997E-03, |
|
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heinrichsweikamp
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|
436 8.55371E-04, 2.26041E-03, |
|
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heinrichsweikamp
parents:
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|
437 6.03079E-04, 1.59437E-03, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
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|
438 4.25414E-04, 1.12479E-03, |
|
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heinrichsweikamp
parents:
519
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|
439 3.00019E-04, 7.93395E-04, |
|
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heinrichsweikamp
parents:
519
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|
440 2.11949E-04, 5.60641E-04, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
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|
441 1.58240E-04, 4.18555E-04, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
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|
442 1.23548E-04, 3.26795E-04, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
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|
443 9.66686E-05, 2.55722E-04, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
changeset
|
444 7.57509E-05, 2.00387E-04, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
changeset
|
445 5.92416E-05, 1.56716E-04, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
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|
446 4.63943E-05, 1.22734E-04, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
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|
447 3.63850E-05, 9.62538E-05 |
|
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|
448 //------------------------------------- |
|
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|
449 }; |
|
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|
450 |
|
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|
451 rom const float e1min[2*16] = { |
|
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|
452 // Integration constant for 1 minute, |
|
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453 // Ie. 1- 2^(-1/HT) |
|
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|
454 //----- N2 --------- e 1min He -------- |
|
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|
455 1.59104E-01, 3.68109E-01, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
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|
456 8.29960E-02, 2.05084E-01, |
|
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heinrichsweikamp
parents:
519
diff
changeset
|
457 5.39424E-02, 1.36579E-01, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
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changeset
|
458 3.67742E-02, 9.44046E-02, |
|
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heinrichsweikamp
parents:
519
diff
changeset
|
459 2.53454E-02, 6.56359E-02, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
changeset
|
460 1.79351E-02, 4.67416E-02, |
|
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heinrichsweikamp
parents:
519
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|
461 1.26840E-02, 3.31991E-02, |
|
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heinrichsweikamp
parents:
519
diff
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|
462 8.96152E-03, 2.35301E-02, |
|
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heinrichsweikamp
parents:
519
diff
changeset
|
463 6.33897E-03, 1.66832E-02, |
|
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heinrichsweikamp
parents:
519
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changeset
|
464 4.73633E-03, 1.24808E-02, |
|
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heinrichsweikamp
parents:
519
diff
changeset
|
465 3.69981E-03, 9.75753E-03, |
|
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heinrichsweikamp
parents:
519
diff
changeset
|
466 2.89600E-03, 7.64329E-03, |
|
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heinrichsweikamp
parents:
519
diff
changeset
|
467 2.27003E-03, 5.99417E-03, |
|
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heinrichsweikamp
parents:
519
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changeset
|
468 1.77572E-03, 4.69082E-03, |
|
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heinrichsweikamp
parents:
519
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changeset
|
469 1.39089E-03, 3.67548E-03, |
|
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heinrichsweikamp
parents:
519
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changeset
|
470 1.09097E-03, 2.88359E-03 |
|
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heinrichsweikamp
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|
471 //------------------------------------- |
|
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|
472 }; |
|
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heinrichsweikamp
parents:
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|
473 |
|
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|
474 rom const float e10min[2*16] = { |
|
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|
475 // The 10 min Value in float notation: |
|
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|
476 // result of 1 - 2^(-10/ht) |
|
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|
477 //---- N2 -------------- He ----------- |
|
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parents:
519
diff
changeset
|
478 8.23223E-01, 9.89851E-01, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
changeset
|
479 5.79552E-01, 8.99258E-01, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
changeset
|
480 4.25651E-01, 7.69737E-01, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
changeset
|
481 3.12487E-01, 6.29027E-01, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
changeset
|
482 2.26416E-01, 4.92821E-01, |
|
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heinrichsweikamp
parents:
519
diff
changeset
|
483 1.65547E-01, 3.80407E-01, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
changeset
|
484 1.19840E-01, 2.86538E-01, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
changeset
|
485 8.60863E-02, 2.11886E-01, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
changeset
|
486 6.16117E-02, 1.54849E-01, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
changeset
|
487 4.63665E-02, 1.18026E-01, |
|
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heinrichsweikamp
parents:
519
diff
changeset
|
488 3.63881E-02, 9.34005E-02, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
changeset
|
489 2.85855E-02, 7.38569E-02, |
|
06e9370c6d75
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heinrichsweikamp
parents:
519
diff
changeset
|
490 2.24698E-02, 5.83504E-02, |
|
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heinrichsweikamp
parents:
519
diff
changeset
|
491 1.76160E-02, 4.59303E-02, |
|
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heinrichsweikamp
parents:
519
diff
changeset
|
492 1.38222E-02, 3.61528E-02, |
|
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heinrichsweikamp
parents:
519
diff
changeset
|
493 1.08563E-02, 2.84646E-02 |
|
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heinrichsweikamp
parents:
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|
494 //------------------------------------- |
|
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|
495 }; |
| 0 | 496 |
| 497 ////////////////////////////////////////////////////////////////////////////// | |
| 498 ////////////////////////////////////////////////////////////////////////////// | |
| 499 ////////////////////////////// THE SUBROUTINES /////////////////////////////// | |
| 500 ////////////////////////////////////////////////////////////////////////////// | |
| 501 ////////////////////////////////////////////////////////////////////////////// | |
| 502 // | |
| 503 // all new in v.102 | |
| 504 // moved from 0x0D000 to 0x0C000 in v.108 | |
| 505 #ifndef UNIX | |
| 506 # pragma code p2_deco = 0x0C000 | |
| 507 #endif | |
| 508 | |
| 509 ////////////////////////////////////////////////////////////////////////////// | |
| 510 ////////////////////////////////////////////////////////////////////////////// | |
| 511 /////////////////////// U T I L I T I E S ///////////////////////////////// | |
| 512 ////////////////////////////////////////////////////////////////////////////// | |
| 513 ////////////////////////////////////////////////////////////////////////////// | |
| 514 | |
| 515 ////////////////////////////////////////////////////////////////////////////// | |
| 516 // Bump to blue-screen when an assert is wrong | |
| 517 #ifdef __DEBUG | |
| 518 void assert_failed(PARAMETER short int line) | |
| 519 { | |
| 520 } | |
| 521 #endif | |
| 522 | |
| 523 ////////////////////////////////////////////////////////////////////////////// | |
| 524 // When calling C code from ASM context, the data stack pointer and | |
| 525 // frames should be reset. Bank8 is used by stack | |
| 526 | |
| 527 #ifdef CROSS_COMPILE | |
| 528 # define RESET_C_STACK | |
| 529 #else | |
| 530 # ifdef __DEBUG | |
| 531 # define RESET_C_STACK fillDataStack(); | |
| 532 void fillDataStack(void) | |
| 533 { | |
| 534 _asm | |
| 535 LFSR 1,C_STACK | |
| 536 MOVLW 0xCC | |
| 537 loop: MOVWF POSTINC1,0 | |
| 538 TSTFSZ FSR1L,0 | |
| 539 BRA loop | |
| 540 | |
| 541 LFSR 1,C_STACK | |
| 542 LFSR 2,C_STACK | |
| 543 _endasm | |
| 544 } | |
| 545 # else | |
| 546 # define RESET_C_STACK \ | |
| 547 _asm \ | |
| 548 LFSR 1, C_STACK \ | |
| 549 LFSR 2, C_STACK \ | |
| 550 _endasm | |
| 551 # endif | |
| 552 #endif | |
| 553 | |
| 554 ////////////////////////////////////////////////////////////////////////////// | |
| 555 // Fast subroutine to read timer 5. | |
| 560 | 556 // Note: result is in 1/32 of milliseconds (30,51757813 us/bit to be precise) |
| 0 | 557 static unsigned short tmr5(void) |
| 558 { | |
| 559 #ifndef CROSS_COMPILE | |
| 560 _asm | |
| 561 movff 0xf7c,PRODL // TMR5L | |
| 562 movff 0xf7d,PRODH // TMR5H | |
| 563 _endasm // result in PRODH:PRODL. | |
| 564 #else | |
| 565 return 0; | |
| 566 #endif | |
| 567 } | |
| 568 | |
| 569 ////////////////////////////////////////////////////////////////////////////// | |
| 560 | 570 // read Buhlmann tables A and B for compartment ci |
| 0 | 571 // |
| 560 | 572 static void read_Buhlmann_coefficients(void) |
| 0 | 573 { |
| 574 #ifndef CROSS_COMPILE | |
| 575 // Note: we don't use far rom pointer, because the | |
| 576 // 24 bits is too complex, hence we have to set | |
| 577 // the UPPER page ourself... | |
| 578 // --> Set zero if tables are moved to lower pages ! | |
| 579 _asm | |
| 580 movlw 1 | |
| 581 movwf TBLPTRU,0 | |
| 582 _endasm | |
| 583 #endif | |
| 584 | |
| 585 assert( ci < NUM_COMP ); | |
| 586 | |
| 587 // Use an interleaved array (AoS) to access coefficients with a | |
| 588 // single addressing. | |
| 589 { | |
| 560 | 590 overlay rom const float* ptr = &Buhlmann_ab[4*ci]; |
| 0 | 591 var_N2_a = *ptr++; |
| 592 var_N2_b = *ptr++; | |
| 593 var_He_a = *ptr++; | |
| 594 var_He_b = *ptr++; | |
| 595 } | |
| 596 } | |
| 597 | |
| 598 ////////////////////////////////////////////////////////////////////////////// | |
| 560 | 599 // read Buhlmann tables for compartment ci |
| 0 | 600 // If period == 0 : 2sec interval |
| 601 // 1 : 1 min interval | |
| 602 // 2 : 10 min interval. | |
| 560 | 603 static void read_Buhlmann_times(PARAMETER char period) |
| 0 | 604 { |
| 605 #ifndef CROSS_COMPILE | |
| 606 // Note: we don't use far rom pointer, because the | |
| 607 // 24 bits is to complex, hence we have to set | |
| 608 // the UPPER page ourself... | |
| 609 // --> Set zero if tables are moved to lower pages ! | |
| 610 _asm | |
| 611 movlw 1 | |
| 612 movwf TBLPTRU,0 | |
| 613 _endasm | |
| 614 #endif | |
| 615 | |
| 616 assert( ci < NUM_COMP ); | |
| 617 | |
| 618 // Integration intervals. | |
| 619 switch(period) | |
| 620 { | |
| 621 case 0: //---- 2 sec ----------------------------------------------------- | |
| 622 { | |
| 623 overlay rom const float* ptr = &e2secs[2*ci]; | |
| 624 var_N2_e = *ptr++; | |
| 625 var_He_e = *ptr++; | |
| 626 } | |
| 627 break; | |
| 628 | |
| 629 case 1: //---- 1 min ----------------------------------------------------- | |
| 630 { | |
| 631 overlay rom const float* ptr = &e1min[2*ci]; | |
| 632 var_N2_e = *ptr++; | |
| 633 var_He_e = *ptr++; | |
| 634 } | |
| 635 break; | |
| 636 | |
| 637 case 2: //---- 10 min ---------------------------------------------------- | |
| 638 { | |
| 639 overlay rom const float* ptr = &e10min[2*ci]; | |
| 640 var_N2_e = *ptr++; | |
| 641 var_He_e = *ptr++; | |
| 642 } | |
| 643 break; | |
| 644 | |
| 645 default: | |
| 646 assert(0); // Never go there... | |
| 647 } | |
| 648 } | |
| 649 | |
| 650 ////////////////////////////////////////////////////////////////////////////// | |
| 560 | 651 // read Buhlmann tables for compartment ci |
| 0 | 652 // |
| 560 | 653 static void read_Buhlmann_ht(void) |
| 0 | 654 { |
| 655 | |
| 656 #ifndef CROSS_COMPILE | |
| 657 // Note: we don't use far rom pointer, because the | |
| 658 // 24 bits is to complex, hence we have to set | |
| 659 // the UPPER page ourself... | |
| 660 // --> Set zero if tables are moved to lower pages ! | |
| 661 _asm | |
| 662 movlw 1 | |
| 663 movwf TBLPTRU,0 | |
| 664 _endasm | |
| 665 #endif | |
| 666 | |
| 667 assert( ci < NUM_COMP ); | |
| 668 { | |
| 560 | 669 overlay rom const float* ptr = &Buhlmann_ht[2*ci]; |
| 0 | 670 var_N2_ht = *ptr++; |
| 671 var_He_ht = *ptr++; | |
| 672 } | |
| 673 | |
| 674 assert( 4.0 <= var_N2_ht && var_N2_ht <= 635.0 ); | |
| 675 assert( 1.5099 <= var_He_ht && var_He_ht <= 240.03 ); | |
| 676 } | |
| 677 | |
| 678 ////////////////////////////////////////////////////////////////////////////// | |
| 679 // calc_nextdecodepth | |
| 680 // | |
| 681 // new in v.102 | |
| 682 // | |
| 683 // INPUT, changing during dive: | |
| 560 | 684 // temp_deco : current depth in absolute pressure |
| 0 | 685 // |
| 686 // INPUT, fixed during dive: | |
| 687 // pres_surface | |
| 688 // GF_delta | |
| 689 // GF_high | |
| 690 // GF_low | |
| 691 // char_I_depth_last_deco | |
| 692 // | |
| 560 | 693 // MODIFIED |
| 694 // locked_GF_step_norm/_alt : used for GF model | |
| 695 // low_depth_norm/_alt : used for GF model | |
| 0 | 696 // |
| 697 // OUTPUT | |
| 560 | 698 // temp_depth_limit : depth of next stop in meters (if RETURN == true ) |
| 699 // depth we can ascent to without stop (if RETURN == false) | |
| 700 // | |
| 701 // RETURN TRUE if a stop is needed. | |
| 0 | 702 // |
| 703 static unsigned char calc_nextdecodepth(void) | |
| 704 { | |
| 560 | 705 overlay unsigned char need_stop; |
| 706 | |
| 707 // compute current depth in meters | |
| 0 | 708 overlay float depth = (temp_deco - pres_surface) * BAR_TO_METER; |
| 709 | |
| 560 | 710 // compute depth in meters after 1 minute of ascent at float_ascent_speed (5..10 m/min) |
| 711 overlay float min_depth = (depth > float_ascent_speed) ? (depth - float_ascent_speed) : 0.0; | |
| 712 | |
| 713 | |
| 714 // allow for 200mbar of weather dependent surface pressure change | |
| 715 assert( depth >= -0.2 ); | |
| 716 | |
| 717 | |
| 718 //---- check if a stop is needed for deco reasons ---------------------------- | |
| 719 | |
| 720 // switch on deco model | |
|
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721 if( char_I_deco_model != 0 ) |
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|
722 { |
| 560 | 723 //---- ZH-L16 + GRADIENT FACTOR Model ------------------------------------ |
| 724 | |
| 725 overlay float locked_GF_step; | |
| 726 overlay float low_depth; | |
| 727 overlay float pres_gradient; | |
| 728 | |
| 0 | 729 overlay unsigned char first_stop = 0; |
| 560 | 730 |
| 731 | |
| 732 // calculate minimum depth we can ascent to in absolute pressure | |
| 0 | 733 sim_limit( GF_low ); |
| 560 | 734 |
| 735 // ...and convert the depth into relative pressure | |
| 736 pres_gradient = sim_lead_tissue_limit - pres_surface; | |
| 737 | |
| 738 // check if we can surface directly | |
| 739 if( pres_gradient <= 0.0 ) | |
| 740 { | |
| 741 min_depth = 0.0; // set minimum depth to 0 meters = surface | |
| 742 goto no_deco_stop; // done. | |
| 743 } | |
| 744 | |
| 745 // convert minimum depth we can ascent to from relative pressure to depth in meters | |
| 746 pres_gradient *= BAR_TO_METER; | |
| 747 | |
| 748 // recall low_depth dependent on current plan | |
| 749 low_depth = (char_O_deco_status & DECO_PLAN_ALTERNATE) ? low_depth_alt : low_depth_norm; | |
| 750 | |
|
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|
751 // Store the deepest point needing a deco stop as the LOW reference for GF. |
| 560 | 752 // NOTE: following stops will be validated using this LOW-HIGH GF scale, |
|
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753 // so if we want to keep coherency, we should not validate this stop |
|
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|
754 // yet, but apply the search to it, as for all the following stops afterward. |
| 560 | 755 if( pres_gradient > low_depth ) |
|
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|
756 { |
| 560 | 757 // update GF parameters |
| 758 low_depth = pres_gradient; | |
|
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|
759 locked_GF_step = GF_delta / low_depth; |
| 560 | 760 |
| 761 // store updated GF parameters dependent on current plan | |
| 762 if( char_O_deco_status & DECO_PLAN_ALTERNATE ) | |
| 763 { | |
| 764 low_depth_alt = low_depth; | |
| 765 locked_GF_step_alt = locked_GF_step; | |
| 766 } | |
| 767 else | |
| 768 { | |
| 769 low_depth_norm = low_depth; | |
| 770 locked_GF_step_norm = locked_GF_step; | |
| 771 } | |
|
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|
772 } |
| 560 | 773 else |
| 774 { | |
| 775 // recall locked_GF_step dependent on current plan | |
| 776 locked_GF_step = (char_O_deco_status & DECO_PLAN_ALTERNATE) ? locked_GF_step_alt : locked_GF_step_norm; | |
| 777 } | |
| 778 | |
| 779 // invalidate this stop if we can ascent for 1 minute without going above minimum required deco depth | |
| 780 if( pres_gradient < min_depth ) goto no_deco_stop; | |
| 781 | |
| 782 | |
| 783 // if program execution passes here, we need a deco stop | |
| 784 | |
| 785 // Round to multiple of 3 meters | |
| 786 first_stop = 3 * (unsigned char)(0.9995 + pres_gradient * 0.333333); | |
| 787 | |
| 788 // check a constraint | |
| 0 | 789 assert( first_stop < 128 ); |
| 790 | |
| 560 | 791 // apply correction for the shallowest stop, use char_I_depth_last_deco (3..6 m) instead |
| 792 if( first_stop == 3 ) first_stop = char_I_depth_last_deco; | |
| 0 | 793 |
| 794 // We have a stop candidate. | |
| 795 // But maybe ascending to the next stop will diminish the constraint, | |
| 560 | 796 // because the GF might decrease more than the pressure gradient... |
| 0 | 797 while(first_stop > 0) |
| 798 { | |
| 560 | 799 // Next depth |
| 800 overlay unsigned char next_stop; | |
| 801 | |
| 802 // invalidate this stop if we can ascent one more minute without going above minimum required deco depth | |
| 803 if( first_stop <= (unsigned char)min_depth ) goto no_deco_stop; | |
| 804 | |
| 805 // compute depth of next stop | |
| 806 if ( first_stop <= char_I_depth_last_deco ) next_stop = 0; | |
| 807 else if ( first_stop == 6 ) next_stop = char_I_depth_last_deco; | |
| 808 else next_stop = first_stop - 3; | |
| 809 | |
| 810 // compute total pressure at the new stop candidate | |
| 811 pres_gradient = next_stop * METER_TO_BAR + pres_surface; | |
| 812 | |
| 813 // compute limit for the new stop candidate | |
| 814 if( (low_depth == 0.0) || (next_stop > low_depth) ) sim_limit( GF_low ); | |
| 815 else sim_limit( GF_high - next_stop * locked_GF_step ); | |
| 816 | |
| 817 // check if ascent to the next stop candidate is possible | |
| 818 if( sim_lead_tissue_limit >= pres_gradient ) goto deco_stop_found; // no - ascent to next_stop forbidden | |
| 819 | |
| 820 // else, validate that stop and loop... | |
| 0 | 821 first_stop = next_stop; |
| 822 } | |
| 823 | |
| 824 no_deco_stop: | |
| 560 | 825 need_stop = 0; // set flag for stop needed to 'no' |
| 826 temp_depth_limit = (unsigned char)min_depth; // report depth we can ascent to without stop | |
| 827 goto done; | |
| 0 | 828 |
|
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|
829 deco_stop_found: |
| 560 | 830 need_stop = 1; // set flag for stop needed to 'yes' |
| 831 temp_depth_limit = (unsigned char)first_stop; // stop depth, in meters | |
| 0 | 832 |
| 833 done: | |
| 834 ; | |
| 835 } | |
| 560 | 836 else |
| 0 | 837 { |
| 560 | 838 //---- ZH-L16 model ------------------------------------------------- |
| 839 | |
| 0 | 840 overlay float pres_gradient; |
| 841 | |
| 560 | 842 |
| 843 // calculate minimum depth we can ascent to in absolute pressure | |
| 0 | 844 sim_limit(1.0); |
| 845 | |
| 560 | 846 // ...and convert the depth into relative pressure |
| 0 | 847 pres_gradient = sim_lead_tissue_limit - pres_surface; |
| 560 | 848 |
| 849 // check if we can surface directly | |
| 0 | 850 if (pres_gradient >= 0) |
| 851 { | |
| 560 | 852 // no - set flag for stop needed to 'yes' |
| 853 need_stop = 1; | |
| 854 | |
| 855 // convert stop depth in relative pressure to stop index | |
| 856 pres_gradient *= BAR_TO_METER / 3; | |
| 857 | |
| 858 // convert stop index to depth in meters, rounded to multiple of 3 meters | |
| 859 temp_depth_limit = 3 * (short) (pres_gradient + 0.99); | |
| 860 | |
| 861 // correct last stop to 4m/5m/6m | |
| 862 if( temp_depth_limit == 3 ) temp_depth_limit = char_I_depth_last_deco; | |
| 0 | 863 } |
| 864 else | |
| 560 | 865 { |
| 866 // yes - set flag for stop needed to 'no' | |
| 867 need_stop = 0; | |
| 868 | |
| 869 // set depth we can ascent to as 0 = surface | |
| 0 | 870 temp_depth_limit = 0; |
| 560 | 871 } |
| 0 | 872 } |
| 873 | |
| 560 | 874 |
| 875 // After the first deco stop, gas changes are only done at deco stops now! | |
| 876 | |
| 877 // check if a stop is found and there is a better gas to switch to | |
| 878 if( need_stop && gas_find_better() ) | |
| 879 { | |
| 880 // set the new calculation ratios for N2, He and O2 | |
| 881 gas_switch_set(); | |
| 882 | |
| 883 // prime the deco stop with the gas change time | |
| 884 update_deco_table(char_I_gas_change_time); | |
| 885 } | |
| 0 | 886 |
| 887 return need_stop; | |
| 888 } | |
| 889 | |
| 890 ////////////////////////////////////////////////////////////////////////////// | |
| 891 // copy_deco_table | |
| 892 // | |
| 893 // Buffer the stops, once computed, so we can continue to display them | |
| 894 // while computing the next set. | |
| 895 // | |
| 896 static void copy_deco_table(void) | |
| 897 { | |
| 898 // Copy depth of the first (deepest) stop, because when reversing | |
| 899 // order, it will be hard to find... | |
| 111 | 900 char_O_first_deco_depth = internal_deco_depth[0]; |
| 0 | 901 char_O_first_deco_time = internal_deco_time [0]; |
| 902 | |
| 903 { | |
| 904 overlay unsigned char x, y; | |
| 905 | |
| 906 for(x=0; x<NUM_STOPS; x++) | |
| 907 { | |
| 908 char_O_deco_depth[x] = internal_deco_depth[x]; | |
| 909 char_O_deco_time [x] = internal_deco_time [x]; | |
| 111 | 910 char_O_deco_gas [x] = internal_deco_gas [x]; |
| 0 | 911 } |
| 912 | |
| 913 //Now fill the char_O_deco_time_for_log array | |
| 914 //---- First: search the first non-null depth | |
| 915 for(x=(NUM_STOPS-1); x != 0; --x) | |
| 916 if( internal_deco_depth[x] != 0 ) break; | |
| 917 | |
| 918 //---- Second: copy to output table (in reverse order) | |
| 919 for(y=0; y<NUM_STOPS; y++, --x) | |
| 920 { | |
| 921 char_O_deco_time_for_log[y] = internal_deco_time [x]; | |
| 922 | |
| 923 // Stop only once the last transfer is done. | |
| 924 if( x == 0 ) break; | |
| 925 } | |
| 926 | |
| 927 //---- Third: fill table end with null | |
| 928 for(y++; y<NUM_STOPS; y++) | |
| 929 { | |
| 560 | 930 char_O_deco_time_for_log[y] = 0; |
| 0 | 931 } |
| 932 } | |
| 933 } | |
| 934 | |
| 935 ////////////////////////////////////////////////////////////////////////////// | |
| 560 | 936 // temp_tissue_safety |
| 0 | 937 // |
| 938 // outsourced in v.102 | |
| 939 // | |
|
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940 // Apply safety factors for both ZH-L16 models. |
| 0 | 941 // |
| 942 static void temp_tissue_safety(void) | |
| 943 { | |
| 944 assert( 0.0 < float_desaturation_multiplier && float_desaturation_multiplier <= 1.0 ); | |
| 945 assert( 1.0 <= float_saturation_multiplier && float_saturation_multiplier <= 2.0 ); | |
| 946 | |
| 560 | 947 if( temp_tissue < 0.0 ) temp_tissue *= float_desaturation_multiplier; |
| 948 else temp_tissue *= float_saturation_multiplier; | |
| 0 | 949 } |
| 950 | |
| 951 ////////////////////////////////////////////////////////////////////////////// | |
| 952 ////////////////////////////////////////////////////////////////////////////// | |
| 953 // ** THE JUMP-IN CODE ** | |
| 954 // ** for the asm code ** | |
| 955 ////////////////////////////////////////////////////////////////////////////// | |
| 956 ////////////////////////////////////////////////////////////////////////////// | |
| 957 | |
| 958 ////////////////////////////////////////////////////////////////////////////// | |
| 560 | 959 // Called every second during diving. |
| 960 // updates tissues every second invocation. | |
| 0 | 961 // |
| 560 | 962 // Every few seconds (or slower when TTS > 16): |
| 963 // - updates deco table (char_O_deco_time/depth) with new values. | |
| 964 // - updates ascent time, | |
| 965 // - sets status to zero (so we can check there is new results). | |
| 0 | 966 // |
| 967 void deco_calc_hauptroutine(void) | |
| 968 { | |
| 969 RESET_C_STACK | |
| 970 calc_hauptroutine(); | |
| 971 } | |
| 972 | |
| 973 ////////////////////////////////////////////////////////////////////////////// | |
| 974 // Reset decompression model: | |
| 975 // + Set all tissues to equilibrium with Air at ambient pressure. | |
| 976 // + Reset last stop to 0m | |
| 977 // + Reset all model output. | |
| 978 void deco_clear_tissue(void) | |
| 979 { | |
| 980 RESET_C_STACK | |
| 981 clear_tissue(); | |
| 982 } | |
| 983 | |
| 984 ////////////////////////////////////////////////////////////////////////////// | |
| 985 | |
| 986 void deco_calc_wo_deco_step_1_min(void) | |
| 987 { | |
| 988 RESET_C_STACK | |
| 989 calc_wo_deco_step_1_min(); | |
| 560 | 990 } |
| 991 | |
| 992 ////////////////////////////////////////////////////////////////////////////// | |
| 993 | |
| 994 void deco_calc_desaturation_time(void) | |
| 995 { | |
| 996 RESET_C_STACK | |
| 997 calc_desaturation_time(); | |
| 0 | 998 } |
| 999 | |
| 1000 ////////////////////////////////////////////////////////////////////////////// | |
| 1001 | |
| 1002 void deco_calc_dive_interval(void) | |
| 1003 { | |
| 1004 RESET_C_STACK | |
| 1005 calc_dive_interval(); | |
| 1006 } | |
| 1007 | |
| 1008 ////////////////////////////////////////////////////////////////////////////// | |
| 560 | 1009 // deco_calc_CNS_decrease_15min |
| 0 | 1010 // |
| 560 | 1011 // new in v.101 |
| 0 | 1012 // |
| 560 | 1013 // calculates the half time of 90 minutes in 6 steps of 15 min |
| 1014 // (Used in sleep mode, for low battery mode). | |
| 0 | 1015 // |
| 560 | 1016 // Output: int_O_CNS_fraction |
| 1017 // Uses and Updates: CNS_fraction | |
| 1018 // | |
| 1019 void deco_calc_CNS_decrease_15min(void) | |
| 0 | 1020 { |
| 560 | 1021 RESET_C_STACK |
| 1022 | |
| 1023 // clock down CNS | |
| 1024 CNS_fraction = 0.890899 * CNS_fraction; | |
| 1025 | |
| 1026 // compute integer copy of CNS value | |
| 1027 compute_CNS_for_display(); | |
| 1028 } | |
| 1029 | |
| 1030 | |
| 1031 ////////////////////////////////////////////////////////////////////////////// | |
| 1032 // Find current gas in the list (if any) and get its change depth | |
| 1033 // | |
| 1034 // Input: char_I_current_gas : 1..5 or 6 | |
| 1035 // | |
| 1036 // Output: sim_gas_last_used : 1..6 or 0 if it is the gas set as FIRST | |
| 1037 // sim_gas_last_depth : change depth in meters or 0 if it is the gas set as FIRST | |
| 1038 // | |
| 1039 static void gas_find_current(void) | |
| 1040 { | |
| 1041 assert( 1 <= char_I_current_gas && char_I_current_gas <= 6 ); | |
| 1042 | |
| 1043 if( char_I_current_gas <= NUM_GAS ) // Gas 1-5 | |
| 0 | 1044 { |
| 560 | 1045 sim_gas_last_used = sim_gas_first_used = char_I_current_gas; |
| 1046 | |
| 1047 // If current gas is a deco gas get it's change depth. | |
| 1048 // Set change depth to 0 if the current gas is the first gas or | |
| 1049 // a travel/normal gas, i.e. if it can be breathed at "any" depth. | |
| 1050 if( char_I_deco_gas_change[sim_gas_last_used-1] ) sim_gas_last_depth = char_I_deco_gas_change[sim_gas_last_used-1]; | |
| 1051 else sim_gas_last_depth = 0; | |
| 0 | 1052 } |
| 1053 else | |
| 560 | 1054 { |
| 1055 sim_gas_last_used = sim_gas_first_used = 0; // Gas 6 (the manually set one) has number 0 here | |
| 1056 sim_gas_last_depth = 0; // handle it as a travel/normal gas | |
| 1057 } | |
| 1058 } | |
| 1059 | |
| 1060 | |
| 1061 ////////////////////////////////////////////////////////////////////////////// | |
| 1062 // Find the deco gas with the shallowest change depth beyond current depth | |
| 1063 // | |
| 1064 // INPUT temp_depth_limit : current depth in meters | |
| 1065 // char_I_deco_gas_change[] : change depths of the deco gases | |
| 1066 // sim_gas_last_depth : change depth of the currently used gas, 0 if on the gas set as FIRST | |
| 1067 // | |
| 1068 // OUTPUT sim_gas_last_depth : switch depth - only if return value is true | |
| 1069 // sim_gas_last_used : index of the gas (1..5) - only if return value is true | |
| 1070 // | |
| 1071 // RETURNS TRUE if a better gas is available | |
| 1072 // | |
| 1073 static unsigned char gas_find_better(void) | |
| 1074 { | |
| 1075 overlay unsigned char switch_depth = 255; | |
| 1076 overlay unsigned char switch_gas = 0; | |
| 1077 overlay unsigned char j; | |
| 1078 | |
| 1079 | |
| 1080 // no automatic gas changes in CCR mode and - as of now - in pSCR mode | |
| 1081 if( char_O_deco_status & DECO_MODE_LOOP ) return 0; | |
| 1082 | |
| 1083 // Loop over all deco gases to find the shallowest one below or at current depth. | |
| 1084 for(j=0; j<NUM_GAS; ++j) | |
| 1085 { | |
| 1086 // Is this the gas we are already breathing? | |
| 1087 // If yes, skip this gas. | |
| 1088 if( j+1 == sim_gas_last_used ) continue; | |
| 1089 | |
| 1090 // Is the change depth of the gas shallower than the current depth? | |
| 1091 // If yes, skip this gas as it is not to be used yet. | |
| 1092 // Remark: this check will also skip all disabled gases and the gas set | |
| 1093 // as 'first' because these have their change depth set to 0. | |
| 1094 if( temp_depth_limit > char_I_deco_gas_change[j] ) continue; | |
| 1095 | |
| 1096 // Is the change depth of the gas deeper than the change depth of the | |
| 1097 // gas we are currently one? | |
| 1098 // If yes, skip this gas as it is not better than the current one. | |
| 1099 // Remark: if there is more than one gas with the same change depth, | |
| 1100 // the last one from the list will be taken. | |
| 1101 if( sim_gas_last_depth && (char_I_deco_gas_change[j] > sim_gas_last_depth) ) continue; | |
| 1102 | |
| 1103 // Is the change depth of the gas shallower or equal to the change depth | |
| 1104 // of the best gas found so far, or is it the first better gas found? | |
| 1105 // If yes, we have a better gas | |
| 1106 if( char_I_deco_gas_change[j] <= switch_depth ) | |
| 1107 { | |
| 1108 switch_gas = j+1; // remember this gas (1..5) | |
| 1109 switch_depth = char_I_deco_gas_change[j]; // remember its change depth | |
| 1110 } | |
| 1111 } // continue looping through all gases to eventually find an even better gas | |
| 1112 | |
| 1113 // has a better gas been found? | |
| 1114 if( switch_gas ) | |
| 1115 { | |
| 1116 // yes | |
| 1117 sim_gas_last_used = switch_gas; // report the index of the better | |
| 1118 sim_gas_last_depth = switch_depth; // report its change depth | |
| 1119 | |
| 1120 assert( sim_gas_last_depth < switch_depth ); | |
| 1121 | |
| 1122 return 1; // signal a better gas was found | |
| 1123 } | |
| 1124 else | |
| 1125 { | |
| 1126 return 0; // signal no better gas was found | |
| 1127 } | |
| 0 | 1128 } |
| 1129 | |
| 1130 ////////////////////////////////////////////////////////////////////////////// | |
| 560 | 1131 // Set calc_N2/He/O2_ratios by sim_gas_last_used |
| 0 | 1132 // |
| 560 | 1133 // Input: sim_gas_last_used : index of gas to use |
| 1134 // N2_ratio, He_ratio : if gas 0 = the manually set gas is in use | |
| 0 | 1135 // |
| 560 | 1136 // Output: calc_N2_ratio, calc_He_ratio, calc_O2ratio |
| 0 | 1137 // |
| 560 | 1138 static void gas_switch_set(void) |
| 0 | 1139 { |
| 560 | 1140 assert( 0 <= sim_gas_last_used <= NUM_GAS ); |
| 1141 | |
| 1142 if( sim_gas_last_used == 0 ) // Gas6 = manually set gas. | |
| 1143 { | |
| 1144 calc_O2_ratio = O2_ratio; | |
| 1145 calc_He_ratio = He_ratio; | |
| 1146 } | |
| 1147 else | |
| 1148 { | |
| 1149 calc_O2_ratio = char_I_deco_O2_ratio[sim_gas_last_used-1] * 0.01; | |
| 1150 calc_He_ratio = char_I_deco_He_ratio[sim_gas_last_used-1] * 0.01; | |
| 1151 } | |
| 1152 | |
| 1153 calc_N2_ratio = 1.0 - calc_O2_ratio - calc_He_ratio; | |
| 1154 | |
| 1155 assert( 0.0 <= calc_N2_ratio && calc_N2_ratio <= 0.95 ); | |
| 1156 assert( 0.0 <= calc_He_ratio && calc_He_ratio <= 1.00 ); | |
| 1157 assert( (calc_N2_ratio + calc_He_ratio) <= 1.00 ); | |
| 0 | 1158 } |
| 1159 | |
| 1160 ////////////////////////////////////////////////////////////////////////////// | |
| 560 | 1161 // Compute ppN2 and ppHe |
| 0 | 1162 // |
| 1163 // Input: calc_N2_ratio, calc_He_ratio : simulated gas mix. | |
| 560 | 1164 // temp_deco : simulated respiration pressure |
| 1165 // float_deco_distance : safety factor | |
| 1166 // ppWater : water-vapor pressure inside respiratory tract | |
| 0 | 1167 // |
| 1168 // Output: ppN2, ppHe. | |
| 1169 // | |
| 1170 static void sim_alveolar_presures(void) | |
| 1171 { | |
| 560 | 1172 overlay float deco_diluent = temp_deco; |
| 1173 | |
| 1174 // read ppO2 reported from sensors or by setpoint // TODO: can be deleted | |
| 1175 // char_actual_ppO2 = char_I_const_ppO2; | |
| 1176 | |
| 0 | 1177 |
| 1178 // Take deco offset into account, but not at surface. | |
| 560 | 1179 // Note: this should be done on ambient pressure, hence before |
| 1180 // computing the diluent partial pressure... | |
| 1181 if( deco_diluent > pres_surface ) deco_diluent += float_deco_distance; | |
| 1182 | |
| 1183 if( char_O_deco_status & DECO_MODE_LOOP ) | |
|
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1184 { |
| 560 | 1185 //---- Loop mode : adjust ppN2 and ppHe for change in ppO2 due to setpoint (CCR) or drop (pSCR)------- |
| 1186 | |
| 1187 // get current setpoint (CCR) or sensor value (CCR, for pSCR see text below) as default | |
| 1188 overlay float const_ppO2 = char_I_const_ppO2 * 0.01; | |
| 1189 | |
| 1190 if( char_O_deco_status & DECO_MODE_PSCR ) | |
| 1191 { | |
| 1192 //---- PSCR mode : compute loop gas ---------------------------------------- | |
| 1193 // | |
| 1194 // As the ppO2 in the loop changes with water depth, we can not use the current | |
| 1195 // sensor value as with CCR mode, but need to compute the ppO2 for the given depth. | |
| 1196 // Then we continue with the CCR mode code which calculates the increases of ppN2 | |
| 1197 // and ppH2 due to the reduction of the ppO2 in the loop. Essentially, diving a | |
| 1198 // PSCR is like diving a CCR with a setpoint lower than the ambient pressure x the | |
| 1199 // O2 fraction of the diluent would yield... | |
| 1200 // | |
| 1201 | |
| 1202 // deco_diluent is 0.0 ... in bar | |
| 1203 // calc_O2_ratio is 0.0 ... 1 as factor | |
| 1204 // char_I_PSCR_drop is 0 ... 15 as % | |
| 1205 // char_I_PSCR_lungratio is 5 ... 20 as % | |
| 1206 // const_ppO2 is 0.0 ... in bar | |
| 1207 | |
| 1208 const_ppO2 = (deco_diluent * calc_O2_ratio) - (1 - calc_O2_ratio) * 0.01 * char_I_PSCR_drop * char_I_PSCR_lungratio; | |
| 1209 | |
| 1210 // capture failure condition | |
| 1211 if( const_ppO2 < 0.0 ) const_ppO2 = 0.0; | |
| 1212 } | |
| 1213 else | |
| 1214 { | |
| 1215 | |
| 1216 //---- CCR mode ------------------------------------------------------------ | |
| 1217 | |
| 1218 // Limit the setpoint to the maximum physically possible ppO2. This prevents for | |
| 1219 // example calculating with a setpoint of 1.3 bar in only 2 meters of depth. | |
| 1220 // Additionally, if limiting occurs, the ppO2 can be further reduced to account | |
| 1221 // for residual inert gases by the user-adjustable setting char_I_cc_max_frac_o2. | |
| 1222 | |
| 1223 if( const_ppO2 > deco_diluent ) // no ppWater subtracted here to give some margin for | |
| 1224 { // sensors delivering data a little bit over target | |
| 1225 | |
| 1226 const_ppO2 = 0.01 * char_I_cc_max_frac_o2 * (deco_diluent - ppWater); | |
| 1227 } | |
| 1228 } | |
| 1229 | |
| 1230 if ( const_ppO2 == 0.0 ) char_actual_ppO2 = 0; | |
| 1231 else if ( const_ppO2 > 2.545 ) char_actual_ppO2 = 255; | |
| 1232 else char_actual_ppO2 = (unsigned char)(const_ppO2*100 + 0.5); | |
| 1233 | |
| 1234 // Note: ppO2 and ratios are known outside the lungs, so there is no ppWater in the equations below: | |
| 0 | 1235 deco_diluent -= const_ppO2; |
| 560 | 1236 deco_diluent /= calc_N2_ratio + calc_He_ratio; |
|
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1237 |
| 560 | 1238 // capture all failure conditions, including div/0 in case diluent is pure O2 |
| 1239 if( (deco_diluent < 0.0) || (calc_O2_ratio > 99.5) ) | |
| 1240 { | |
| 1241 deco_diluent = 0.0; | |
| 1242 | |
| 1243 char_actual_ppO2 = (unsigned char)(temp_deco*100 + 0.5); // without float_deco_distance here as this situation | |
| 1244 // is likely to occur only at 6 meters or shallower | |
| 1245 } | |
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1246 } |
| 560 | 1247 else |
| 1248 { | |
| 1249 //---- OC mode: char_actual_ppO2 will be needed for CNS calculation later -------------------------------- | |
| 1250 | |
| 1251 overlay float ppO2 = pres_respiration * calc_O2_ratio; | |
| 1252 | |
| 1253 if ( ppO2 > 2.545 ) char_actual_ppO2 = 255; | |
| 1254 else char_actual_ppO2 = (unsigned char)(ppO2*100 + 0.5); | |
| 1255 } | |
| 1256 | |
| 1257 | |
| 0 | 1258 if( deco_diluent > ppWater ) |
| 1259 { | |
| 1260 ppN2 = calc_N2_ratio * (deco_diluent - ppWater); | |
| 1261 ppHe = calc_He_ratio * (deco_diluent - ppWater); | |
| 1262 } | |
| 1263 else | |
| 1264 { | |
| 1265 ppN2 = 0.0; | |
| 1266 ppHe = 0.0; | |
| 1267 } | |
| 560 | 1268 |
| 0 | 1269 assert( 0.0 <= ppN2 && ppN2 < 14.0 ); |
| 1270 assert( 0.0 <= ppHe && ppHe < 14.0 ); | |
| 1271 } | |
| 1272 | |
| 1273 ////////////////////////////////////////////////////////////////////////////// | |
| 1274 // clear_tissue | |
| 1275 // | |
| 1276 // optimized in v.101 (var_N2_a) | |
| 1277 // | |
| 1278 // preload tissues with standard pressure for the given ambient pressure. | |
| 1279 // Note: fixed N2_ratio for standard air. | |
| 1280 // | |
| 1281 static void clear_tissue(void) | |
| 1282 { | |
| 560 | 1283 pres_respiration = 0.001 * int_I_pres_respiration; |
| 1284 N2_equilibrium = 0.7902 * (pres_respiration - ppWater); | |
| 1285 | |
| 0 | 1286 for(ci=0; ci<NUM_COMP; ci++) |
| 1287 { | |
| 313 | 1288 // cycle through the 16 Buhlmann N2 tissues |
| 560 | 1289 pres_tissue_N2[ci] = N2_equilibrium; // initialize data for "real" tissue |
| 1290 char_O_tissue_N2_saturation[ci] = 11; // initialize data for tissue graphics | |
| 1291 | |
| 1292 | |
| 1293 // cycle through the 16 Buhlmann He tissues | |
| 1294 pres_tissue_He[ci] = 0.0; // initialize data for "real" tissue | |
| 1295 char_O_tissue_He_saturation[ci] = 0; // initialize data for tissue graphics | |
| 0 | 1296 } |
| 1297 | |
| 560 | 1298 clear_CNS_fraction(); |
| 1299 | |
| 0 | 1300 clear_deco_table(); |
| 560 | 1301 |
| 1302 char_O_main_status = 0; | |
| 1303 char_O_deco_status = 0; | |
| 1304 char_O_nullzeit = 0; | |
| 1305 char_O_gtissue_no = 0; | |
| 1306 char_O_deco_warnings = 0; | |
| 1307 | |
| 1308 int_O_ascenttime = 0; | |
| 1309 int_O_gradient_factor = 0; | |
| 1310 | |
| 1311 calc_lead_tissue_limit = 0.0; | |
| 0 | 1312 } |
| 1313 | |
| 1314 ////////////////////////////////////////////////////////////////////////////// | |
| 1315 // calc_hauptroutine | |
| 1316 // | |
| 1317 // this is the major code in dive mode calculates: | |
| 1318 // the tissues, | |
| 1319 // the bottom time, | |
| 1320 // and simulates the ascend with all deco stops. | |
| 1321 // | |
| 1322 // | |
| 1323 static void calc_hauptroutine(void) | |
| 1324 { | |
| 560 | 1325 unsigned int int_ppO2_min; |
| 1326 unsigned int int_ppO2_max; | |
| 1327 | |
| 1328 | |
| 1329 //--- set-up part -------------------------------------------------------------------------------- | |
| 1330 | |
| 1331 // twosectimer: | |
| 1332 // calc_hauptroutine is now invoked every second to speed up the deco planning. | |
| 1333 // Because the tissue and CNS calculations are based on a 2 seconds period, the | |
| 1334 // the following toggle-timer will be used by the respective routines to skip | |
| 1335 // every 2nd invocation. | |
| 1336 twosectimer = (twosectimer) ? 0 : 1; // toggle the toggle-timer | |
| 1337 | |
| 1338 | |
| 1339 // set up normal tissue updating or "fast forward" updating for simulator sim+5' function | |
| 1340 // and deco calculator bottom time calculation | |
| 1341 if( char_I_sim_advance_time > 0 ) | |
| 1342 { | |
| 1343 // configure char_I_sim_advance_time minutes of tissue updating | |
| 1344 tissue_increment = char_I_sim_advance_time // given number of minutes, limited to 127 | |
| 1345 | 128; // set flag for updating the "real" tissues & CNS | |
| 1346 | |
| 1347 char_I_sim_advance_time = 0; // clear "mailbox" | |
| 1348 } | |
| 1349 else | |
| 1350 { | |
| 1351 // configure 2 seconds of tissue updating | |
| 1352 tissue_increment = 0 // encoding for 2 seconds update | |
| 1353 | 128; // set flag for updating the "real" tissues & CNS | |
| 1354 } | |
| 1355 | |
| 1356 //---- calculate the real tissue's data ----------------------------------------------------------------- | |
| 1357 | |
| 1358 calc_hauptroutine_data_input(); // acquire current environment data | |
| 1359 | |
| 1360 calc_hauptroutine_update_tissues(); // update tissue pressures, also sets char_actual_ppO2 | |
| 1361 | |
| 1362 calc_CNS_fraction(); // calculate CNS% for the real tissues | |
| 1363 | |
| 1364 compute_CNS_for_display(); // compute integer copy of CNS value for display purpose | |
| 1365 | |
| 1366 calc_gradient_factor(); // compute current GF | |
| 1367 | |
| 1368 | |
| 1369 //---- compute ppO2 warnings ------------------------------------------------------------------------------ | |
| 1370 | |
| 1371 // compute conditional min/max values | |
| 1372 int_ppO2_min = (char_O_main_status & DECO_MODE_LOOP) ? (unsigned int)char_I_ppO2_min_loop : (unsigned int)char_I_ppO2_min; | |
| 1373 int_ppO2_max = (char_O_deco_warnings & DECO_FLAG ) ? (unsigned int)char_I_ppO2_max_deco : (unsigned int)char_I_ppO2_max; | |
| 1374 | |
| 1375 // check for safe range of pure oxygen | |
| 1376 if ( int_O_O2_ppO2 >= int_ppO2_max ) int_O_O2_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; | |
| 1377 | |
| 1378 // check for safe range of breathed gas | |
| 1379 if ( int_O_breathed_ppO2 <= int_ppO2_min ) int_O_breathed_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; | |
| 1380 else if ( int_O_breathed_ppO2 >= int_ppO2_max ) int_O_breathed_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; | |
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1381 else if ( char_O_main_status & DECO_MODE_LOOP ) ; // no attention generated in loop modes |
| 560 | 1382 else if ( int_O_breathed_ppO2 >= ppO2_prewarn_threshold ) int_O_breathed_ppO2 |= INT_FLAG_PREWARNING; |
| 1383 | |
| 1384 // check for safe range of pure diluent | |
| 1385 if ( int_O_pure_ppO2 <= (unsigned int)char_I_ppO2_min ) int_O_pure_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; | |
| 1386 else if ( int_O_pure_ppO2 >= int_ppO2_max ) int_O_pure_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; | |
| 1387 | |
| 1388 // check for safe range of calculated pSCR loop gas | |
| 1389 if ( int_O_pSCR_ppO2 <= int_ppO2_min ) int_O_pSCR_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; | |
| 1390 else if ( int_O_pSCR_ppO2 >= int_ppO2_max ) int_O_pSCR_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; | |
| 1391 | |
| 1392 | |
| 1393 //---- toggle between calculation for NDL (bottom time), deco stops and more deco stops (continue) ------ | |
| 1394 | |
| 1395 switch( char_O_deco_status & DECO_STATUS_MASK ) | |
| 0 | 1396 { |
| 560 | 1397 overlay unsigned char i; |
| 1398 | |
| 1399 case DECO_STATUS_INIT: //---- At surface: start a new dive --------------------- | |
| 1400 | |
| 1401 clear_deco_table(); | |
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1402 copy_deco_table(); |
| 560 | 1403 |
| 1404 | |
| 1405 char_I_gas_change_time = 1; // TODO: validate proper operation before enabling this options-table parameter | |
| 1406 | |
| 1407 char_I_ascent_speed = 10; // TODO: validate proper operation before enabling this options-table parameter, | |
| 1408 // caution: values < 10 may have an impact on the deco calculation run-times! | |
| 1409 | |
| 1410 | |
| 1411 float_ascent_speed = 1.00 * char_I_ascent_speed; | |
| 1412 float_desaturation_multiplier = 0.01 * char_I_desaturation_multiplier; | |
| 1413 float_saturation_multiplier = 0.01 * char_I_saturation_multiplier; | |
| 1414 float_deco_distance = 0.01 * char_I_deco_distance; | |
| 1415 | |
| 1416 int_O_ascenttime = 0; // reset ascent time in normal plan | |
| 1417 int_O_alternate_ascenttime = 0; // reset ascent time in alternative plan | |
| 1418 char_O_nullzeit = 0; // reset no decompression limit (NDL) in normal plan | |
| 1419 char_O_alternate_nullzeit = 0; // reset no decompression limit (NDL) in alternative plan | |
| 1420 char_O_deco_warnings = 0; // reset all deco warning flags | |
| 1421 deco_tissue_vector = 0; // reset tissue deco vector | |
| 1422 IBCD_tissue_vector = 0; // reset tissue IBCD vector | |
| 1423 | |
| 1424 int_O_desaturation_time = 65535; // tag desaturation time as invalid (it will not be computed during a dive) | |
| 1425 | |
| 1426 | |
| 1427 for(i=0; i<NUM_GAS; ++i) | |
| 1428 { | |
| 1429 int_O_gas_volumes[i] = 0; | |
| 1430 int_O_tank_pres_need[i] = 0 + INT_FLAG_ZERO; // 0 bar + flag for 0 bar | |
| 1431 } | |
| 1432 | |
| 1433 for(i=0; i<NUM_COMP; ++i) | |
| 1434 { | |
| 1435 split_N2_He[i] = 90; // used for calculation of no-fly time | |
| 1436 } | |
| 1437 | |
| 1438 | |
| 1439 // init CNS counters | |
| 1440 CNS_sim_norm_fraction = CNS_sim_alt_fraction = CNS_fraction; // the floats | |
| 1441 int_O_normal_CNS_fraction = int_O_alternate_CNS_fraction = int_O_CNS_fraction; // the integers | |
| 1442 | |
| 1443 | |
| 0 | 1444 // Values that should be reset just once for the full real dive. |
| 1445 // This is used to record the lowest stop for the whole dive, | |
| 560 | 1446 // including ACCROSS all simulated ascents. |
| 1447 low_depth_norm = low_depth_alt = 0.0; | |
| 1448 locked_GF_step_norm = locked_GF_step_alt = 0.0; | |
| 1449 | |
| 1450 | |
| 1451 // continue in state DECO_STATUS_START to calculate the bottom-part of the dive and the NDL | |
| 1452 char_O_deco_status &= ~DECO_STATUS_MASK; | |
| 1453 | |
| 1454 // code execution continues in state DECO_STATUS_START | |
| 1455 | |
| 1456 | |
| 1457 case DECO_STATUS_START: //---- bottom time ------------------------------------- | |
| 0 | 1458 default: |
| 560 | 1459 |
| 1460 // reread the GF settings in case there was a switch between GF/aGF | |
| 1461 GF_low = char_I_GF_Low_percentage * 0.01; | |
| 1462 GF_high = char_I_GF_High_percentage * 0.01; | |
| 1463 GF_delta = GF_high - GF_low; | |
| 1464 | |
| 1465 // Lookup current gas and store it also as the first gas used. This gas will be used for the bottom | |
| 1466 // segment of the dive and for the period of delayed ascent when calculating fTTS or bailout. | |
| 1467 gas_find_current(); | |
| 1468 | |
| 1469 // setup the calculation ratio's calc_N2_ratio, calc_He_ratio and calc_O2_ratio | |
| 1470 gas_switch_set(); | |
| 1471 | |
| 1472 // calculate ppN2 and ppHe from calc_N2_ratio & calc_He_ratio | |
| 1473 sim_alveolar_presures(); | |
| 1474 | |
| 1475 // clear the internal(!) stops table | |
| 1476 clear_deco_table(); | |
| 1477 | |
| 1478 // initialize the simulated tissues with the current state of the real tissues | |
| 1479 update_startvalues(); | |
| 1480 | |
| 1481 // calculate the effect of extended bottom time due to delayed ascent / fTTS on current gas | |
| 1482 if( char_O_deco_status & DECO_ASCENT_DELAYED ) sim_extra_time(); | |
| 1483 | |
| 1484 // calculate if we are within no decompression limit (NDL) | |
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1485 calc_nullzeit(); |
| 560 | 1486 |
| 1487 // check which plan we are on | |
| 1488 if( char_O_deco_status & DECO_PLAN_ALTERNATE ) | |
| 1489 { | |
| 1490 //---- alternate dive plan -------------------------------------------------------------------- | |
| 1491 | |
| 1492 // Some NDL time left in alternate plan? | |
| 1493 if( char_O_alternate_nullzeit > 0 ) | |
| 1494 { | |
| 1495 // clear tank pressure needs | |
| 1496 if( char_O_deco_status & DECO_VOLUME_CALCULATE ) | |
| 1497 for(i=0; i<NUM_GAS; ++i) int_O_tank_pres_need[i] = 0 + INT_FLAG_ZERO; // 0 bar + flag for 0 bar | |
| 1498 | |
| 1499 // calculate the CNS% at the end of the dive if requested: | |
| 1500 // as we are in no stop, CNS at end of dive is more or less the same CNS we have now | |
| 1501 if( char_O_deco_status & DECO_CNS_CALCULATE ) int_O_alternate_CNS_fraction = int_O_CNS_fraction; | |
| 1502 | |
| 1503 // clear fTTS ascent time | |
| 1504 int_O_alternate_ascenttime = 0; | |
| 1505 | |
| 1506 // YES - computation of alternate plan completed | |
| 1507 char_O_deco_status &= ~DECO_STATUS_MASK; | |
| 1508 } | |
| 1509 else | |
| 1510 { | |
| 1511 // NO - clear status bits and set status bits for | |
| 1512 // calculation of ascent on next invocation | |
| 1513 char_O_deco_status &= ~DECO_STATUS_MASK; | |
| 1514 char_O_deco_status |= DECO_STATUS_ASCENT; | |
| 1515 } | |
| 1516 } | |
| 1517 else | |
| 1518 { | |
| 1519 //---- normal dive plan ------------------------------------------------------------------------- | |
| 1520 | |
| 1521 // Some NDL time left in normal plan? | |
| 1522 if( char_O_nullzeit > 0 ) | |
| 1523 { | |
| 1524 // published (erased) stops table | |
| 1525 copy_deco_table(); | |
| 1526 | |
| 1527 // ** commented out - char_O_deco_last_stop is not used for anything | |
| 1528 // | |
| 1529 // // set last stop to 0 (for OSTC menu animation) | |
| 1530 // char_O_deco_last_stop = 0; | |
| 1531 | |
| 1532 // clear tank pressure needs | |
| 1533 if( char_O_deco_status & DECO_VOLUME_CALCULATE ) | |
| 1534 for(i=0; i<NUM_GAS; ++i) int_O_tank_pres_need[i] = 0 + INT_FLAG_ZERO; // 0 bar + flag for 0 bar | |
| 1535 | |
| 1536 // calculate the CNS% at the end of the dive if requested: | |
| 1537 // as we are in no stop, CNS at end of dive is more or less the same CNS we have now | |
| 1538 if( char_O_deco_status & DECO_CNS_CALCULATE ) int_O_normal_CNS_fraction = int_O_CNS_fraction; | |
| 1539 | |
| 1540 // YES - computation of normal plan completed | |
| 1541 char_O_deco_status &= ~DECO_STATUS_MASK; | |
| 1542 } | |
| 1543 else | |
| 1544 { | |
| 1545 // NO - clear status bits and set status bits for | |
| 1546 // calculation of ascent on next invocation | |
| 1547 char_O_deco_status &= ~DECO_STATUS_MASK; | |
| 1548 char_O_deco_status |= DECO_STATUS_ASCENT; | |
| 1549 } | |
| 1550 } | |
| 1551 | |
| 1552 break; | |
| 1553 | |
| 1554 | |
| 1555 case DECO_STATUS_ASCENT: //---- Simulate ascent to first stop ------------------- | |
| 1556 | |
| 1557 // initialize depth (in abs.pressure) for ascent and deco simulation, start from current real depth | |
| 1558 temp_deco = pres_respiration; | |
| 1559 | |
| 1560 // calculate ascent to first stop | |
| 1561 sim_ascent_to_first_stop(); | |
| 1562 | |
| 1563 // calculate all further stops next time | |
| 1564 char_O_deco_status &= ~DECO_STATUS_MASK; // clear status bits and set status bits | |
| 1565 char_O_deco_status |= DECO_STATUS_STOPS; // for calculation of stops on next invocation | |
| 1566 | |
|
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1567 break; |
| 0 | 1568 |
| 560 | 1569 |
| 1570 case DECO_STATUS_STOPS: //---- Simulate stops ---------------------------------- | |
| 1571 | |
| 1572 calc_hauptroutine_calc_deco(); | |
| 1573 | |
| 1574 // If simulation is finished, do some more computations if requested | |
| 1575 // and restore the GF low reference so that the next ascent simulation | |
| 1576 // is done from the current depth: | |
| 1577 if( !(char_O_deco_status & DECO_STATUS_MASK) ) | |
| 1578 { | |
| 1579 // Calculate ascent time, result in int_O_ascenttime or int_O_alternate_ascenttime | |
| 1580 calc_ascenttime(); | |
| 1581 | |
| 1582 // the current depth is needed by calc_CNS_planning() and gas_volumes() | |
| 1583 bottom_depth = (unsigned char)((pres_respiration - pres_surface)*BAR_TO_METER); | |
| 1584 | |
| 1585 // if requested, calculate the CNS% at the end of the dive (including the deco stops) | |
| 1586 if( char_O_deco_status & DECO_CNS_CALCULATE ) calc_CNS_planning(); | |
| 1587 | |
| 1588 // if requested, calculate the required gas volumes and tank pressures at the end of the dive. | |
| 1589 if( char_O_deco_status & DECO_VOLUME_CALCULATE ) gas_volumes(); | |
| 1590 | |
| 1591 // some more aftermath dependent on the current plan | |
| 1592 if( char_O_deco_status & DECO_PLAN_ALTERNATE ) | |
| 1593 { | |
| 1594 //---- alternative plan ---------------------------------------------------- | |
| 1595 | |
| 1596 // was CNS at end of dive calculated? | |
| 1597 if( char_O_deco_status & DECO_CNS_CALCULATE ) | |
| 1598 { | |
| 1599 // yes - compute CNS value to display | |
| 1600 if ( CNS_sim_alt_fraction < 0.01 ) int_O_alternate_CNS_fraction = 0; | |
| 1601 else if ( CNS_sim_alt_fraction > 9.985 ) int_O_alternate_CNS_fraction = 999 + INT_FLAG_WARNING; | |
| 1602 else | |
| 1603 { | |
| 1604 // convert float to integer | |
| 1605 int_O_alternate_CNS_fraction = (unsigned short)(100 * CNS_sim_alt_fraction + 0.5); | |
| 1606 | |
| 1607 // set warning flag if CNS is >= 100% | |
| 1608 if( int_O_alternate_CNS_fraction >= 100 ) | |
| 1609 int_O_alternate_CNS_fraction |= INT_FLAG_WARNING; | |
| 1610 | |
| 1611 // set invalid flag if there is an overflow in the stops table | |
| 1612 if( char_O_deco_warnings & DECO_WARNING_STOPTABLE_OVERFLOW ) | |
| 1613 int_O_alternate_CNS_fraction |= INT_FLAG_INVALID; | |
| 1614 } | |
| 1615 } | |
| 1616 else | |
| 1617 { | |
| 1618 // no - invalidate value (value = 0, invalid flag set) | |
| 1619 int_O_alternate_CNS_fraction = INT_FLAG_INVALID; | |
| 1620 } | |
| 1621 } | |
| 1622 else | |
| 1623 { | |
| 1624 //---- normal plan --------------------------------------------------------- | |
| 1625 | |
| 1626 // publish the stops table | |
| 1627 copy_deco_table(); | |
| 1628 | |
| 1629 // was CNS at end of dive calculated? | |
| 1630 if( char_O_deco_status & DECO_CNS_CALCULATE ) | |
| 1631 { | |
| 1632 // yes - compute CNS value to display | |
| 1633 if ( CNS_sim_norm_fraction < 0.01 ) int_O_normal_CNS_fraction = 0; | |
| 1634 else if ( CNS_sim_norm_fraction >= 9.985 ) int_O_normal_CNS_fraction = 999 + INT_FLAG_WARNING; | |
| 1635 else | |
| 1636 { | |
| 1637 // convert float to integer | |
| 1638 int_O_normal_CNS_fraction = (unsigned short)(100 * CNS_sim_norm_fraction + 0.5); | |
| 1639 | |
| 1640 // set warning flag if CNS is >= 100% | |
| 1641 if( int_O_normal_CNS_fraction >= 100 ) | |
| 1642 int_O_normal_CNS_fraction |= INT_FLAG_WARNING; | |
| 1643 | |
| 1644 // set invalid flag if there is an overflow in the stops table | |
| 1645 if( char_O_deco_warnings & DECO_WARNING_STOPTABLE_OVERFLOW ) | |
| 1646 int_O_normal_CNS_fraction |= INT_FLAG_INVALID; | |
| 1647 } | |
| 1648 } | |
| 1649 else | |
| 1650 { | |
| 1651 // no - invalidate value (value = 0, invalid flag set) | |
| 1652 int_O_normal_CNS_fraction = INT_FLAG_INVALID; | |
| 1653 } | |
| 1654 | |
| 1655 } // aftermath | |
| 1656 } // if | |
| 1657 | |
|
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1658 break; |
| 560 | 1659 |
| 1660 } // switch | |
| 0 | 1661 } |
| 1662 | |
| 1663 ////////////////////////////////////////////////////////////////////////////// | |
| 1664 // calc_hauptroutine_data_input | |
| 1665 // | |
| 1666 // Reset all C-code dive parameters from their ASM-code values. | |
| 1667 // Detect gas change condition. | |
| 1668 // | |
| 1669 void calc_hauptroutine_data_input(void) | |
| 1670 { | |
| 560 | 1671 // get the current pressures |
| 1672 pres_respiration = 0.001 * int_I_pres_respiration; | |
| 1673 pres_surface = 0.001 * int_I_pres_surface; | |
| 1674 | |
| 1675 // get the currently breathed gas mixture | |
| 1676 O2_ratio = 0.01 * char_I_O2_ratio; | |
| 1677 He_ratio = 0.01 * char_I_He_ratio; | |
| 1678 | |
| 1679 // N2 ratios are computed within p2_deco.c from the O2 and He ratios | |
| 1680 N2_ratio = 1.0 - O2_ratio - He_ratio; | |
| 1681 | |
| 1682 // N2 tissue pressure at surface equilibrium, used for tissue graphics scaling | |
| 1683 N2_equilibrium = 0.7902 * (pres_surface - ppWater); | |
| 0 | 1684 } |
| 1685 | |
| 1686 ////////////////////////////////////////////////////////////////////////////// | |
| 1687 // | |
| 1688 // | |
| 1689 void calc_hauptroutine_update_tissues(void) | |
| 1690 { | |
| 560 | 1691 overlay float pres_diluent = pres_respiration; |
| 1692 | |
| 1693 | |
| 0 | 1694 assert( 0.00 <= N2_ratio && N2_ratio <= 1.00 ); |
| 1695 assert( 0.00 <= He_ratio && He_ratio <= 1.00 ); | |
|
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1696 assert( (N2_ratio + He_ratio) <= 1.00 ); |
| 0 | 1697 assert( 0.800 < pres_respiration && pres_respiration < 14.0 ); |
| 1698 | |
| 560 | 1699 |
| 1700 //---- OC, CCR and Bailout Mode Gas Calculations ------------------------------------------------------------ | |
| 1701 | |
| 1702 // calculate ppO2 of pure oxygen | |
| 1703 O2_ppO2 = (pres_respiration - ppWater); | |
| 1704 | |
| 1705 // capture failure condition in case pres_respiration is < ppWater (should never happen...) | |
| 1706 if( O2_ppO2 < 0.0 ) O2_ppO2 = 0.0; | |
| 1707 | |
| 1708 // calculate ppO2 of the pure gas (diluent) | |
| 1709 pure_ppO2 = O2_ppO2 * O2_ratio; | |
| 1710 | |
| 1711 | |
| 1712 //---- PSCR Mode Gas Calculation----------------------------------------------------------- | |
| 1713 | |
| 1714 // With flags set for PSCR we compute the ppO2 in the loop from the diluent's O2 | |
| 1715 // ratio and the PSCR parameters. This figure will be used in the pSCR custom view. | |
| 1716 // If sensors are used (char_I_const_ppO2 > 0), we will override the calculated ppO2 | |
| 1717 // with the sensor data. Then we continue with the CCR mode code which calculates | |
| 1718 // the increase of ppN2 and ppH2 due to the reduction of the ppO2 in the loop. | |
| 1719 // Essentially, diving a pSCR is like diving a CCR with a setpoint set lower than | |
| 1720 // the ambient pressure multiplied with the O2 fraction of the diluent... | |
| 1721 | |
| 1722 // calculate pSCR ppO2 | |
| 1723 // | |
| 1724 // pres_respiration is 0.0 ... in bar | |
| 1725 // O2_ratio is 0.0 ... 1.0 as factor | |
| 1726 // char_I_PSCR_drop is 0 ... 15 as % | |
| 1727 // char_I_PSCR_lungratio is 5 ... 20 as % | |
| 1728 // pSCRppO2 is 0.0 ... in bar | |
| 1729 | |
| 1730 pSCR_ppO2 = (pres_respiration * O2_ratio) - (1 - O2_ratio) * 0.01 * char_I_PSCR_drop * char_I_PSCR_lungratio; | |
| 1731 | |
| 1732 // capture failure condition if case pSCR_ppO2 becomes negative | |
| 1733 if( pSCR_ppO2 < 0.0 ) pSCR_ppO2 = 0.0; | |
| 1734 | |
| 1735 | |
| 1736 //---- Loop modes : adjust ppN2 and ppHe for change in ppO2 due to setpoint (CCR) or drop (pSCR) ------------ | |
| 1737 if ( char_O_main_status & DECO_MODE_LOOP ) | |
| 0 | 1738 { |
| 560 | 1739 overlay float const_ppO2; |
| 1740 | |
| 1741 // get the current sensor reading (CCR / pSCR if fitted) or the fixed setpoint (CCR) / a zero (pSCR) | |
| 1742 const_ppO2 = 0.01 * char_I_const_ppO2; | |
| 1743 | |
| 1744 // Limit the setpoint to the maximum physically possible ppO2. This prevents for | |
| 1745 // example calculating with a setpoint of 1.3 bar in only 2 meters of depth. | |
| 1746 // Additionally, if limiting occurs, the ppO2 can be further reduced to account | |
| 1747 // for residual inert gases by the user-adjustable setting char_I_cc_max_frac_o2. | |
| 1748 | |
| 1749 if( const_ppO2 > pres_respiration ) // no ppWater subtracted here to give some margin for | |
| 1750 { // sensors delivering data a little bit over target | |
| 1751 | |
| 1752 const_ppO2 = 0.01 * char_I_cc_max_frac_o2 * (pres_respiration - ppWater); | |
| 1753 } | |
| 1754 | |
| 1755 // check which kind of loop we are on | |
| 1756 if( char_O_main_status & DECO_MODE_PSCR ) | |
| 1757 { | |
| 1758 //---- pSCR Mode -------------------------------------------------------------------------- | |
| 1759 | |
| 1760 // check if a sensor is fitted | |
| 1761 if( char_I_const_ppO2 ) breathed_ppO2 = const_ppO2; // yes - derive ppO2s from (char_I_)const_ppO2 | |
| 1762 else breathed_ppO2 = pSCR_ppO2; // no - derive ppO2s from calculated ppO2 | |
| 1763 } | |
| 1764 else | |
| 1765 { | |
| 1766 //---- CCR Mode --------------------------------------------------------------------------- | |
| 1767 | |
| 1768 // derive breathed ppO2 from (char_I_)const_ppO2, which holds sensor reading or fixed setpoint | |
| 1769 breathed_ppO2 = const_ppO2; | |
| 1770 } | |
| 1771 | |
| 1772 // adjust diluent pressure (ppN2 + ppHe) for change in ppO2 due to setpoint (CCR) or drop (pSCR) | |
| 0 | 1773 pres_diluent -= const_ppO2; |
| 560 | 1774 pres_diluent /= N2_ratio + He_ratio; |
| 1775 | |
| 1776 // capture all failure conditions, including div/0 in case diluent is pure O2 | |
| 1777 if( (pres_diluent < 0.0) || (char_I_O2_ratio == 100) ) | |
| 1778 { | |
| 1779 pres_diluent = 0.0; | |
| 1780 breathed_ppO2 = pure_ppO2; | |
| 1781 } | |
| 1782 | |
| 1783 } | |
| 1784 else | |
| 1785 { //---- OC mode ----------------------------------------------------------------------------------------- | |
| 1786 | |
| 1787 // breathed ppO2 is ppO2 of pure gas | |
| 1788 breathed_ppO2 = pure_ppO2; | |
| 1789 } | |
| 1790 | |
| 1791 | |
| 1792 // derive char_actual_ppO2 in [cbar], used for calculating CNS% | |
| 1793 if ( breathed_ppO2 < 0.01 ) char_actual_ppO2 = 0; | |
| 1794 else if ( breathed_ppO2 >= 2.545 ) char_actual_ppO2 = 255; | |
| 1795 else char_actual_ppO2 = (unsigned char)(100 * breathed_ppO2 + 0.5); | |
| 1796 | |
| 1797 | |
| 1798 //---- export ppO2 values in [cbar] for warning generation and display purpose ------------------------------ | |
| 1799 | |
| 1800 // pure oxygen ppO2 | |
| 1801 if ( O2_ppO2 < 0.01 ) int_O_O2_ppO2 = 0; | |
| 1802 else if ( O2_ppO2 >= 9.995 ) int_O_O2_ppO2 = 999; | |
| 1803 else int_O_O2_ppO2 = (unsigned int)(100 * O2_ppO2 + 0.5); | |
| 1804 | |
| 1805 // pure gas ppO2 | |
| 1806 if ( pure_ppO2 < 0.01 ) int_O_pure_ppO2 = 0; | |
| 1807 else if ( pure_ppO2 >= 9.995 ) int_O_pure_ppO2 = 999; | |
| 1808 else int_O_pure_ppO2 = (unsigned int)(100 * pure_ppO2 + 0.5); | |
| 1809 | |
| 1810 // calculated pSCR ppO2 | |
| 1811 if ( pSCR_ppO2 < 0.01 ) int_O_pSCR_ppO2 = 0; | |
| 1812 else if ( pSCR_ppO2 >= 9.995 ) int_O_pSCR_ppO2 = 999; | |
| 1813 else int_O_pSCR_ppO2 = (unsigned int)(100 * pSCR_ppO2 + 0.5); | |
| 1814 | |
| 1815 // breathed ppO2 | |
| 1816 if ( breathed_ppO2 < 0.01 ) int_O_breathed_ppO2 = 0; | |
| 1817 else if ( breathed_ppO2 >= 9.995 ) int_O_breathed_ppO2 = 999; | |
| 1818 else int_O_breathed_ppO2 = (unsigned int)(100 * breathed_ppO2 + 0.5); | |
| 1819 | |
| 1820 | |
| 1821 //---- calculate ppN2, ppHe and EAD, END ------------------------------------------------------------------- | |
| 1822 | |
| 0 | 1823 if( pres_diluent > ppWater ) |
| 1824 { | |
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1825 overlay float EAD, END; |
| 0 | 1826 |
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1827 ppN2 = N2_ratio * (pres_diluent - ppWater); |
| 0 | 1828 ppHe = He_ratio * (pres_diluent - ppWater); |
| 1829 | |
| 560 | 1830 // EAD : Equivalent Air Depth. Equivalent depth for the same N2 level with plain air. |
| 0 | 1831 // ppN2 = 79% * (P_EAD - ppWater) |
| 1832 // EAD = (P_EAD - Psurface) * 10 | |
| 1833 // ie: EAD = (ppN2 / 0.7902 + ppWater -Psurface) * 10 | |
| 560 | 1834 |
| 0 | 1835 EAD = (ppN2 / 0.7902 + ppWater - pres_surface) * BAR_TO_METER; |
| 560 | 1836 |
| 1837 if( (EAD < 0.0) || (EAD > 245.5) ) EAD = 0.0; | |
| 1838 | |
| 0 | 1839 char_O_EAD = (unsigned char)(EAD + 0.5); |
| 1840 | |
| 560 | 1841 |
| 1842 // END : Equivalent Narcotic Depth. | |
| 1843 // Here we count O2 as narcotic too. Hence everything but helium (has a narcosis | |
| 1844 // factor of 0.23 btw). Hence the formula becomes: | |
| 0 | 1845 // END * BarPerMeter * (1.0 - 0.0) - ppWater + Psurface == Pambient - ppHe - ppWater |
| 1846 // ie: END = (Pambient - ppHe - Psurface) * BAR_TO_METER | |
| 1847 // | |
| 1848 // Source cited: | |
| 1849 // The Physiology and Medicine of Diving by Peter Bennett and David Elliott, | |
| 1850 // 4th edition, 1993, W.B.Saunders Company Ltd, London. | |
| 560 | 1851 |
| 0 | 1852 END = (pres_respiration - ppHe - pres_surface) * BAR_TO_METER; |
| 560 | 1853 |
| 1854 if( (END < 0.0) || (END > 245.5) ) END = 0.0; | |
| 1855 | |
| 1856 char_O_END = (unsigned char)(END + 0.5); | |
| 0 | 1857 } |
| 560 | 1858 else |
| 0 | 1859 { |
| 560 | 1860 ppN2 = ppHe = 0.0; |
| 1861 | |
| 1862 char_O_EAD = char_O_END = 0; | |
| 0 | 1863 } |
| 1864 | |
| 560 | 1865 |
| 1866 //---- calculate decompression status ---------------------------------------------------------------------- | |
| 1867 | |
| 1868 // Calculate tissues | |
| 1869 calc_tissue(); | |
| 1870 | |
| 1871 // Calculate limit for surface, ie. GF_high. | |
| 0 | 1872 calc_limit(); |
| 560 | 1873 |
| 1874 | |
| 1875 // Fill int_O_ceiling (in mbar) if ceiling is below the surface | |
| 1876 if( (calc_lead_tissue_limit - pres_surface) > 0 ) | |
| 1877 { | |
| 1878 | |
| 1879 // compatibility version | |
| 1880 int_O_ceiling = (short)((calc_lead_tissue_limit - pres_surface) * 1000); | |
| 1881 | |
| 1882 // new version | |
| 1883 // // Round up to next 10 cm so that the ceiling disappears on the display only when the ceiling | |
| 1884 // // limit is really zero. This will coincident then with TTS switching back to NDL time. | |
| 1885 // int_O_ceiling = (short)((calc_lead_tissue_limit - pres_surface) * 1000 + 9); | |
| 1886 | |
| 1887 | |
| 1888 // limit int_O_ceiling to 16000 mbar (150 m) | |
| 1889 if( int_O_ceiling > 16000) int_O_ceiling = 16000; | |
| 1890 } | |
| 126 | 1891 else |
| 560 | 1892 { |
| 126 | 1893 int_O_ceiling = 0; |
| 560 | 1894 } |
| 126 | 1895 |
| 0 | 1896 int_O_gtissue_press = (short)((pres_tissue_N2[char_O_gtissue_no] + pres_tissue_He[char_O_gtissue_no]) * 1000); |
| 1897 } | |
| 1898 | |
| 1899 | |
| 1900 ////////////////////////////////////////////////////////////////////////////// | |
| 1901 // Compute stops. | |
| 1902 // | |
| 1903 // Note: because this can be very long, break on 16 iterations, and set state | |
| 560 | 1904 // to DECO_STATUS_FINISHED when finished, or to DECO_STATUS_STOPS when |
| 1905 // needing to continue. | |
| 0 | 1906 // Note: because each iteration might be very long too (~ 66 ms in 1.84beta), |
| 560 | 1907 // break the loop when elapsed time exceeds 512 milliseconds. |
| 0 | 1908 // |
| 1909 void calc_hauptroutine_calc_deco(void) | |
| 1910 { | |
| 560 | 1911 overlay unsigned char loop; |
| 1912 | |
| 1913 for(loop = 0; loop < 16; ++loop) | |
| 1914 { | |
| 1915 // limit loops to 512ms, using timer 5 | |
| 1916 if( tmr5() & (512*32) ) break; | |
| 1917 | |
| 1918 // calc_nextdecodepth() | |
| 1919 // | |
| 1920 // INPUT temp_deco : current depth in absolute pressure | |
| 1921 // OUTPUT temp_depth_limit : depth of next stop in meters | |
| 1922 // RETURN true if a stop is needed | |
| 1923 // | |
| 1924 // The function manages gas changes by itself, including priming | |
| 1925 // the deco stop with the configured gas change time. | |
| 1926 // | |
| 1927 if( calc_nextdecodepth() ) | |
| 1928 { | |
| 1929 if( temp_depth_limit == 0 ) goto Surface; // this check should not bee needed as in | |
| 1930 // this case the RETURN value will be false | |
| 1931 | |
| 1932 //---- stop required at temp_depth_limit ------------------------------------- | |
| 1933 | |
| 1934 // convert stop depth in meters to absolute pressure | |
| 1935 temp_deco = temp_depth_limit * METER_TO_BAR + pres_surface; | |
| 1936 | |
| 1937 // add one minute to the current stop, or add a new stop, | |
| 1938 // or abort deco calculation if the deco table is full. | |
| 1939 if( !update_deco_table(1) ) goto Surface; | |
| 1940 } | |
| 1941 else | |
| 1942 { | |
| 1943 //---- no stop required -------------------------------------- | |
| 1944 | |
| 1945 // ascend by float_ascent_speed for 1 minute | |
| 1946 temp_deco -= float_ascent_speed * METER_TO_BAR; | |
| 1947 | |
| 1948 // finish deco calculation if surface is reached | |
| 1949 if( temp_deco <= pres_surface ) | |
| 1950 { | |
| 0 | 1951 Surface: |
| 560 | 1952 // set deco engine status to done (DECO_STATUS_FINISHED) |
| 1953 char_O_deco_status &= ~DECO_STATUS_MASK; | |
| 1954 | |
| 1955 // ** commented out - char_O_deco_last_stop is not used for anything | |
| 1956 // | |
| 1957 // // surface reached (to animate menu) | |
| 1958 // if( !(char_O_deco_status & DECO_PLAN_ALTERNATE)) char_O_deco_last_stop = 0; | |
| 1959 | |
| 1960 return; | |
| 1961 } | |
| 1962 } | |
| 1963 | |
| 1964 | |
| 1965 //---- as one minute as passed now, update the tissues ---------------------- | |
| 1966 | |
| 1967 // program 1 minute interval on simulated tissues (Flagbit 7 = 0) | |
| 1968 tissue_increment = 1; | |
| 1969 | |
| 1970 // compute current ppN2 and ppHe | |
| 1971 sim_alveolar_presures(); | |
| 1972 | |
| 1973 // update the tissues | |
| 1974 calc_tissue(); | |
| 1975 } | |
| 1976 | |
| 1977 // ** commented out - char_O_deco_last_stop is not used for anything | |
| 1978 // | |
| 1979 // // surface not reached, need more stops... store reached depth for menu animation. | |
| 1980 // if( !(char_O_deco_status & DECO_PLAN_ALTERNATE) ) char_O_deco_last_stop = temp_depth_limit; | |
| 0 | 1981 } |
| 1982 | |
| 1983 | |
| 1984 ////////////////////////////////////////////////////////////////////////////// | |
| 560 | 1985 // Simulate ascent to first deco stop. |
| 0 | 1986 // |
| 1987 // | |
| 560 | 1988 // Modified: temp_deco : current depth in ascent and deco simulation, in bar absolute pressure |
| 0 | 1989 // |
| 1990 void sim_ascent_to_first_stop(void) | |
| 1991 { | |
| 560 | 1992 overlay unsigned char fast = 1; // 1 = 1 minute steps, 0 = 2 seconds steps |
| 1993 overlay unsigned char gaschange = 0; // 1 = do a gas change, 0 = no better gas available | |
| 1994 | |
| 1995 | |
| 1996 //---- Loop until first deco stop or surface is reached ---------- | |
| 1997 for(;;) | |
| 1998 { | |
| 1999 // depth in absolute pressure we came from | |
| 2000 overlay float old_deco = temp_deco; | |
| 2001 | |
| 2002 // try ascending 1 full minute (fast) or 2 seconds (!fast) | |
| 2003 if ( fast ) temp_deco -= float_ascent_speed * METER_TO_BAR; // 1 min at float_ascent_speed ( 5 .. 10 m/min) | |
| 2004 else temp_deco -= (float_ascent_speed/30.0) * METER_TO_BAR; // 2 sec at float_ascent_speed (17 .. 33 cm/min) | |
| 2005 | |
| 2006 // but don't go over surface | |
| 2007 if( temp_deco < pres_surface ) temp_deco = pres_surface; | |
| 2008 | |
| 2009 // compute sim_lead_tissue_limit | |
| 2010 if ( char_I_deco_model != 0 ) sim_limit(GF_low); | |
| 2011 else sim_limit(1.0); | |
| 2012 | |
| 2013 // did we overshoot the first deco stop? | |
| 2014 if( temp_deco < sim_lead_tissue_limit ) | |
| 2015 { | |
| 2016 // YES - back to last depth below first stop | |
| 2017 temp_deco = old_deco; | |
| 2018 | |
| 2019 // switch to 2 seconds ascent if not yet in, else done | |
| 2020 if( fast ) | |
| 2021 { | |
| 2022 fast = 0; // retry with 2 seconds ascent steps | |
| 2023 continue; | |
| 2024 } | |
| 2025 else | |
| 2026 { | |
| 2027 break; // done... | |
| 2028 } | |
| 2029 } | |
| 2030 | |
| 2031 // If code execution passes along here, we did not overshoot the first stop. | |
| 2032 | |
| 2033 // did we reach the surface? if yes, done! | |
| 2034 if( temp_deco == pres_surface ) break; | |
| 2035 | |
| 2036 // depth in meters where we are now (no round-up) | |
| 2037 temp_depth_limit = (unsigned char)((temp_deco - pres_surface) * BAR_TO_METER); | |
| 2038 | |
| 2039 // Check if there is a better gas to switch to, but only in alternative plan mode | |
| 2040 // or if override is set. If yes, introduce a stop for the gas change. | |
| 2041 if( ((char_O_deco_status & DECO_PLAN_ALTERNATE) || (char_O_main_status & DECO_GASCHANGE_OVRD)) | |
| 2042 && gas_find_better() ) | |
| 2043 { | |
| 2044 // depth in meters we came from | |
| 2045 overlay unsigned char old_depth_limit = (unsigned char)((old_deco - pres_surface) * BAR_TO_METER); | |
| 2046 | |
| 2047 // adjust temp_depth_limit to the gas change depth, but not deeper than the depth we came from | |
| 2048 temp_depth_limit = (sim_gas_last_depth < old_depth_limit) ? sim_gas_last_depth : old_depth_limit; | |
| 2049 | |
| 2050 // create a stop for the gas change | |
| 2051 update_deco_table(char_I_gas_change_time); | |
| 2052 | |
| 2053 // set the new calculation values for N2, He and O2 | |
| 2054 gas_switch_set(); | |
| 2055 | |
| 2056 // signal to create a stop for the gas change and update the tissues | |
| 2057 gaschange = char_I_gas_change_time; | |
| 2058 | |
| 2059 // Adjust the depth for the tissue update to the stop depth. In case of fast mode, this | |
| 2060 // imposes that the ascent from the 'old_deco' depth to this stop took 1 minute although | |
| 2061 // we might have only ascended one or two meters... | |
| 2062 temp_deco = temp_depth_limit * METER_TO_BAR + pres_surface; | |
| 2063 } | |
| 2064 | |
| 2065 // Did one minute pass by and/or do we have a gas change? | |
| 2066 // Remark: The 2 seconds ascent iterations towards the first deco stop in !fast speed may take | |
| 2067 // up to 28 seconds in total - for this rough half of a minute no tissue updates will be computed. | |
| 2068 // Well, it could be done by setting tissue_increment = 0 in !fast condition and making calls to | |
| 2069 // sim_alveolar_presures() and calc_tissue() - see code commented out below. | |
| 2070 if( fast || gaschange ) | |
| 2071 { | |
| 2072 // program interval on simulated tissues (flag bit 7 = 0) | |
| 2073 tissue_increment = fast + gaschange; | |
| 2074 | |
| 2075 // clear gas change signal | |
| 2076 gaschange = 0; | |
| 2077 // } | |
| 2078 // else | |
| 2079 // { | |
| 2080 // // program 2 seconds interval on simulated tissues (flag bit 7 = 0) | |
| 2081 // tissue_increment = 0; | |
| 2082 // } | |
| 2083 // { | |
| 2084 // compute ppN2/ppHe for current depth from temp_deco | |
| 2085 sim_alveolar_presures(); | |
| 2086 | |
| 2087 // update the tissues | |
| 2088 calc_tissue(); | |
| 2089 } | |
| 2090 } | |
| 0 | 2091 } |
| 2092 | |
| 2093 ////////////////////////////////////////////////////////////////////////////// | |
| 560 | 2094 // Simulate extra time at the current depth. |
| 0 | 2095 // |
| 560 | 2096 // This routine is used for the futureTTS / delayed ascent feature. |
| 2097 // | |
| 0 | 2098 void sim_extra_time(void) |
| 2099 { | |
| 560 | 2100 overlay unsigned char backup = tissue_increment; // back-up tissue_increment |
| 2101 | |
| 2102 tissue_increment = char_I_extra_time; // program interval on simulated tissues (Flagbit 7 = 0) | |
| 2103 | |
| 2104 calc_tissue(); // update the tissues | |
| 2105 | |
| 2106 tissue_increment = backup; // restore tissue_increment | |
| 0 | 2107 } |
| 2108 | |
| 2109 ////////////////////////////////////////////////////////////////////////////// | |
| 2110 // calc_tissue | |
| 2111 // | |
| 2112 // optimized in v.101 | |
| 2113 // | |
| 560 | 2114 // INPUT: ppN2, ppHe, tissue_increment |
| 2115 // MODIFIED: pres_tissue_N2[], pres_tissue_He[] | |
| 2116 // OUTPUT: char_O_tissue_N2_saturation[], char_O_tissue_He_saturation[] | |
| 2117 // | |
| 2118 static void calc_tissue() | |
| 0 | 2119 { |
| 560 | 2120 overlay float temp_tissue_N2; |
| 2121 overlay float temp_tissue_He; | |
| 2122 overlay unsigned char period; | |
| 2123 overlay unsigned char i; | |
| 2124 | |
| 2125 | |
| 0 | 2126 assert( 0.00 <= ppN2 && ppN2 < 11.2 ); // 80% N2 at 130m |
| 2127 assert( 0.00 <= ppHe && ppHe < 12.6 ); // 90% He at 130m | |
| 560 | 2128 |
| 2129 | |
| 2130 for (ci=0;ci<NUM_COMP;ci++) // iterate through all compartments | |
| 0 | 2131 { |
| 560 | 2132 i = tissue_increment & 127; // extract number of minutes to do (if i > 0) |
| 2133 // or if one 2 second period is to do (if i = 0) | |
| 2134 | |
| 2135 if( i == 0 ) // check if we shall do one 2-seconds period | |
| 2136 { | |
| 2137 read_Buhlmann_times(0); // YES, program coefficients for a 2 seconds period | |
| 2138 period = 1; // set period length (in cycles) | |
| 2139 i = 1; // and one cycle to do | |
| 2140 } | |
| 2141 else if( i > 9 ) // check if we can start with 10 minutes periods | |
| 2142 { | |
| 2143 read_Buhlmann_times(2); // YES, program coefficients for 10 minutes periods | |
| 2144 period = 10; // set period length (in cycles) to ten | |
| 2145 } | |
| 2146 else // we shall do 1 to 9 minutes | |
| 2147 { | |
| 2148 read_Buhlmann_times(1); // program coefficients for 1 minute periods | |
| 2149 period = 1; // set period length (in cycles) to one | |
| 2150 } | |
| 2151 | |
| 2152 do | |
| 2153 { | |
| 2154 //---- N2 ------------------------------------------------------------------------------- | |
| 2155 | |
| 2156 temp_tissue = (tissue_increment & 128) ? pres_tissue_N2[ci] : sim_pres_tissue_N2[ci]; | |
| 2157 | |
| 2158 temp_tissue = (ppN2 - temp_tissue) * var_N2_e; | |
| 2159 | |
| 2160 temp_tissue_safety(); | |
| 2161 | |
| 2162 if( tissue_increment & 128 ) | |
| 2163 { | |
| 2164 // The temp variable takes on purpose just the tissue increment from the last loop's iteration. | |
| 2165 temp_tissue_N2 = temp_tissue; | |
| 2166 | |
| 2167 // Update the real tissues if either we are on the 2 seconds interval, | |
| 2168 // or if we shall advance the tissues on a one or several minutes basis. | |
| 2169 if( twosectimer || (tissue_increment & 127) ) pres_tissue_N2[ci] += temp_tissue; | |
| 2170 } | |
| 2171 else | |
| 2172 { | |
| 2173 // Updates of the sim-tissues always comes on a 1 minutes basis, | |
| 2174 // so we do not need to check of the 2 seconds interval. | |
| 2175 sim_pres_tissue_N2[ci] += temp_tissue; | |
| 2176 } | |
| 2177 | |
| 2178 | |
| 2179 //---- He ------------------------------------------------------------------------------- | |
| 2180 | |
| 2181 temp_tissue = (tissue_increment & 128) ? pres_tissue_He[ci] : sim_pres_tissue_He[ci]; | |
| 2182 | |
| 2183 temp_tissue = (ppHe - temp_tissue) * var_He_e; | |
| 2184 | |
| 2185 temp_tissue_safety(); | |
| 2186 | |
| 2187 if( tissue_increment & 128 ) | |
| 2188 { | |
| 2189 // The temp variable takes on purpose just the tissue increment from the last loop's iteration. | |
| 2190 temp_tissue_He = temp_tissue; | |
| 2191 | |
| 2192 // Update the real tissues if either we are on the 2 seconds interval, | |
| 2193 // or if we shall advance the tissues on a one or several minutes basis. | |
| 2194 if( twosectimer || (tissue_increment & 127) ) pres_tissue_He[ci] += temp_tissue; | |
| 2195 | |
| 2196 } | |
| 2197 else | |
| 2198 { | |
| 2199 // Updates of the sim-tissues always comes on a 1 minutes basis, | |
| 2200 // so we do not need to check of the 2 seconds interval. | |
| 2201 sim_pres_tissue_He[ci] += temp_tissue; | |
| 2202 } | |
| 2203 | |
| 2204 | |
| 2205 // decrement loop counter | |
| 2206 i -= period; | |
| 2207 | |
| 2208 // check if we need to switch from 10 minute periods to 1 minute periods | |
| 2209 if( (i > 0) && (period = 10) && (i < 10) ) | |
| 2210 { | |
| 2211 read_Buhlmann_times(1); // program coefficients for 1 minute periods | |
| 2212 period = 1; // set period length (in cycles) to one | |
| 2213 } | |
| 2214 } | |
| 2215 while( i ); | |
| 2216 | |
| 2217 | |
| 2218 // have the computations been done for the "real" tissues? | |
| 2219 if( (tissue_increment & 128) && (twosectimer || (tissue_increment & 127)) ) | |
| 2220 { | |
| 2221 // net tissue balance | |
| 2222 temp_tissue = temp_tissue_N2 + temp_tissue_He; | |
| 2223 | |
| 2224 // check tissue on-/off-gassing and IBCD with applying a threshold of +/-HYST | |
| 2225 // | |
| 2226 if ( temp_tissue < -HYST ) // Check if the tissue is off-gassing | |
| 2227 { | |
| 2228 deco_tissue_vector |= (1 << ci); // tag tissue as being in decompression | |
| 2229 IBCD_tissue_vector &= ~(1 << ci); // tag tissue as not experiencing mentionable IBCD | |
| 2230 } | |
| 2231 else if ( temp_tissue > +HYST ) // check if the tissue in on-gassing | |
| 2232 { | |
| 2233 deco_tissue_vector &= ~(1 << ci); // tag tissue as not being in decompression | |
| 2234 | |
| 2235 if( ((temp_tissue_N2 > 0.0) && (temp_tissue_He < 0.0)) // check for counter diffusion | |
| 2236 || ((temp_tissue_N2 < 0.0) && (temp_tissue_He > 0.0)) ) | |
| 2237 { | |
| 2238 IBCD_tissue_vector |= (1 << ci); // tag tissue as experiencing mentionable IBCD | |
| 2239 } | |
| 2240 } | |
| 2241 | |
| 2242 | |
| 2243 // keep the saturating / desaturating flags from last invocation | |
| 2244 char_O_tissue_N2_saturation[ci] &= 128; | |
| 2245 char_O_tissue_He_saturation[ci] &= 128; | |
| 2246 | |
| 2247 // flip the flags applying a hysteresis of HYST (actual value: see #define of HYST) | |
| 2248 if( temp_tissue_N2 > +HYST ) char_O_tissue_N2_saturation[ci] = 128; // set flag for tissue pressure is increasing | |
| 2249 else if( temp_tissue_N2 < -HYST ) char_O_tissue_N2_saturation[ci] = 0; // clear flag (-> tissue pressure is decreasing) | |
| 2250 | |
| 2251 if( temp_tissue_He > +HYST ) char_O_tissue_He_saturation[ci] = 128; // set flag for tissue pressure is increasing | |
| 2252 else if( temp_tissue_He < -HYST ) char_O_tissue_He_saturation[ci] = 0; // clear flag (-> tissue pressure is decreasing) | |
| 2253 | |
| 2254 | |
| 2255 // For N2 tissue display purpose: | |
| 2256 // Scale tissue press so that saturation in 70m on AIR gives a value of approx. 80. | |
| 2257 // The surface steady-state tissue loading of [0.7902 * (pres_respiration - ppWater)] bar | |
| 2258 // gives then a 10. If N2 is completely washed out of the tissue, result will be 0. | |
| 2259 // This scaling is adapted to the capabilities of the tissue graphics in the custom views. | |
| 2260 temp_tissue = (pres_tissue_N2[ci] / N2_equilibrium) * 10; | |
| 2261 | |
| 2262 // limit to 127 to leave space for sat/desat flag | |
| 2263 if (temp_tissue > 127) temp_tissue = 127; | |
| 2264 | |
| 2265 // export as integer | |
| 2266 char_O_tissue_N2_saturation[ci] += (unsigned char)temp_tissue; | |
| 2267 | |
| 2268 | |
| 2269 // For H2 tissue display purpose: | |
| 2270 // Scale tissue press so that saturation in 120m on TMX 10/70 gives a value of approx. 70. | |
| 2271 // With no He in a tissue, result will be 0. | |
| 2272 // This scaling is adapted to the capabilities of the tissue graphics in the custom views. | |
| 2273 temp_tissue = pres_tissue_He[ci] * 7.7; | |
| 2274 | |
| 2275 // limit to 127 to leave space for sat/desat flag | |
| 2276 if (temp_tissue > 127) temp_tissue = 127; | |
| 2277 | |
| 2278 // export as integer | |
| 2279 char_O_tissue_He_saturation[ci] += (unsigned char)temp_tissue; | |
| 2280 } | |
| 2281 | |
| 2282 }// for | |
| 0 | 2283 } |
| 2284 | |
| 2285 ////////////////////////////////////////////////////////////////////////////// | |
| 2286 // calc_limit | |
| 2287 // | |
| 2288 // New in v.111 : separated from calc_tissue(), and depends on GF value. | |
| 2289 // | |
| 2290 static void calc_limit(void) | |
| 2291 { | |
| 560 | 2292 char_O_gtissue_no = 0; |
| 2293 calc_lead_tissue_limit = 0.0; | |
| 2294 | |
| 2295 // clear IBCD, microbubbles and outside warning flags (locked warnings will be preserved) | |
| 2296 char_O_deco_warnings &= ~(DECO_WARNING_IBCD + DECO_WARNING_MBUBBLES + DECO_WARNING_OUTSIDE); | |
| 2297 | |
| 2298 | |
| 2299 for(ci=0; ci<NUM_COMP; ci++) | |
| 0 | 2300 { |
| 2301 overlay float N2 = pres_tissue_N2[ci]; | |
| 2302 overlay float He = pres_tissue_He[ci]; | |
| 560 | 2303 overlay float pres_tissue = N2 + He; |
| 2304 overlay float pres_min; | |
| 2305 overlay float gf; | |
| 2306 overlay float threshold; | |
| 2307 | |
| 2308 read_Buhlmann_coefficients(); | |
| 2309 var_N2_a = (var_N2_a * N2 + var_He_a * He) / pres_tissue; | |
| 2310 var_N2_b = (var_N2_b * N2 + var_He_b * He) / pres_tissue; | |
| 2311 | |
| 2312 // calculate minimum ambient pressure that the tissue can withstand according to straight Buhlmann | |
| 2313 pres_min = (pres_tissue - var_N2_a) * var_N2_b; | |
| 2314 | |
| 2315 // calculate current gf value (1.0 = 100%) of this tissue | |
| 2316 gf = (pres_tissue - pres_respiration) / (pres_tissue - pres_min); | |
| 2317 if( gf < 0.0 ) gf = 0.0; | |
| 2318 | |
| 2319 // calculate a threshold value for use below | |
| 2320 // ToDo: finalize the definition of the threshold | |
| 2321 threshold = 0.02 * ci + 0.9; | |
| 2322 | |
| 2323 // check if this tissue is likely to develop microbubbles | |
| 2324 // and/or if this tissue is outside the Buhlmann model | |
| 2325 if( ci <= 5 ) | |
| 2326 { | |
| 2327 if( gf >= threshold ) | |
| 2328 { | |
| 2329 char_O_deco_warnings |= (DECO_WARNING_MBUBBLES + DECO_WARNING_MBUBBLES_lock); | |
| 2330 | |
| 2331 if( gf >= 1.0 ) | |
| 2332 { | |
| 2333 char_O_deco_warnings |= (DECO_WARNING_OUTSIDE + DECO_WARNING_OUTSIDE_lock); | |
| 2334 } | |
| 2335 } | |
| 2336 } | |
| 2337 else | |
| 2338 { | |
| 2339 if( gf >= 1.0 ) | |
| 2340 { | |
| 2341 char_O_deco_warnings |= (DECO_WARNING_MBUBBLES + DECO_WARNING_MBUBBLES_lock); | |
| 2342 | |
| 2343 if( gf >= threshold ) | |
| 2344 { | |
| 2345 char_O_deco_warnings |= (DECO_WARNING_OUTSIDE + DECO_WARNING_OUTSIDE_lock); | |
| 2346 } | |
| 2347 } | |
| 2348 } | |
| 2349 | |
| 2350 | |
| 2351 // Apply the Eric Baker's varying gradient factor correction if the GF-Model is selected. | |
| 0 | 2352 // Note: the correction factor depends both on GF and b, |
| 2353 // Actual values are in the 1.5 .. 1.0 range (for a GF=30%), | |
| 2354 // so that can change who is the leading gas... | |
| 560 | 2355 // Note: Also depends of the GF. So the calculus is different for GF_low, current GF, or GF_high... |
| 2356 // *BUT* calc_tissue() is used to compute bottom time, hence what would happen at surface, | |
| 0 | 2357 // hence at GF_high. |
| 560 | 2358 if( char_I_deco_model != 0 ) pres_min = ( pres_tissue - var_N2_a * ( GF_high) ) * var_N2_b |
| 2359 / ( GF_high + var_N2_b * (1.0 - GF_high) ); | |
| 2360 | |
| 2361 // check if this tissue requires a higher ambient pressure than was found to be needed up to now | |
| 2362 if( pres_min > calc_lead_tissue_limit ) | |
| 0 | 2363 { |
| 560 | 2364 char_O_gtissue_no = ci; |
| 2365 calc_lead_tissue_limit = pres_min; | |
| 0 | 2366 } |
| 2367 } | |
| 560 | 2368 |
| 2369 // check IBCD condition | |
| 2370 if( !IBCD_tissue_vector ) | |
| 2371 { | |
| 2372 char_O_deco_warnings &= ~DECO_WARNING_IBCD; // no IBCD in any tissue, clear flag | |
| 2373 } | |
| 2374 else if( (IBCD_tissue_vector & (1 << char_O_gtissue_no)) | |
| 2375 && ((pres_tissue_N2[char_O_gtissue_no] + pres_tissue_He[char_O_gtissue_no]) > pres_respiration) ) | |
| 2376 { | |
| 2377 // leading tissue is in IBCD condition and in super-saturation, set flags. | |
| 2378 char_O_deco_warnings |= (DECO_WARNING_IBCD + DECO_WARNING_IBCD_lock); | |
| 2379 } | |
| 2380 | |
|
566
3febf1cd1bf4
Fix anomalie when toggling ppO2 warning levels in ccr and pscr mode.
heinrichsweikamp
parents:
560
diff
changeset
|
2381 // set deco flag if we are in deco and at least one of the real tissues is off-gassing |
|
3febf1cd1bf4
Fix anomalie when toggling ppO2 warning levels in ccr and pscr mode.
heinrichsweikamp
parents:
560
diff
changeset
|
2382 // clear deco flag if all of the real tissues are on-gassing |
|
3febf1cd1bf4
Fix anomalie when toggling ppO2 warning levels in ccr and pscr mode.
heinrichsweikamp
parents:
560
diff
changeset
|
2383 if ( (NDL_time == 0) && deco_tissue_vector ) char_O_deco_warnings |= DECO_FLAG; |
|
3febf1cd1bf4
Fix anomalie when toggling ppO2 warning levels in ccr and pscr mode.
heinrichsweikamp
parents:
560
diff
changeset
|
2384 else if ( !deco_tissue_vector ) char_O_deco_warnings &= ~DECO_FLAG; |
| 560 | 2385 |
| 0 | 2386 |
| 2387 assert( char_O_gtissue_no < NUM_COMP ); | |
| 2388 assert( 0.0 <= calc_lead_tissue_limit && calc_lead_tissue_limit <= 14.0); | |
| 2389 } | |
| 2390 | |
| 2391 ////////////////////////////////////////////////////////////////////////////// | |
| 2392 // calc_nullzeit | |
| 2393 // | |
| 2394 // calculates the remaining bottom time | |
| 2395 // | |
| 2396 // NOTE: Erik Baker's closed formula works for Nitroxes. Trimix adds a second | |
| 2397 // exponential term to the M-value equation, making it impossible to | |
| 2398 // invert... So we have to make a fast-simu until we find a better way. | |
| 2399 // | |
| 2400 // Input: pres_respiration | |
| 560 | 2401 // Output: char_O_nullzeit / char_O_alternate_nullzeit |
| 0 | 2402 // |
| 2403 static void calc_nullzeit(void) | |
| 2404 { | |
| 560 | 2405 overlay unsigned char nullzeit = 240; |
| 2406 | |
| 2407 | |
| 0 | 2408 //---- Compute ppN2 and ppHe --------------------------------------------- |
| 2409 temp_deco = pres_respiration; | |
| 2410 sim_alveolar_presures(); | |
| 560 | 2411 |
| 0 | 2412 for(ci=0; ci<NUM_COMP; ci++) |
| 2413 { | |
| 2414 //---- Read A/B values and loading factor for N2 and He -------------- | |
| 560 | 2415 |
| 2416 overlay float tN2 = sim_pres_tissue_N2[ci]; | |
| 2417 overlay float tHe = sim_pres_tissue_He[ci]; | |
| 2418 | |
| 0 | 2419 overlay float t = tN2 + tHe; |
| 2420 overlay unsigned char ndl; | |
| 2421 overlay unsigned char period = 10; | |
| 2422 | |
| 560 | 2423 read_Buhlmann_coefficients(); |
| 2424 read_Buhlmann_times(2); // Starts with a 10min period. | |
| 0 | 2425 |
| 2426 //---- Simulate for that tissue -------------------------------------- | |
| 560 | 2427 // NOTE: No need to simulate for longer than the already found NDL. |
| 2428 for(ndl=0; ndl<nullzeit;) | |
| 0 | 2429 { |
| 560 | 2430 //---- Compute updated mix M-value at surface |
| 2431 overlay float a = (var_N2_a * tN2 + var_He_a * tHe) / t; | |
| 2432 overlay float b = (var_N2_b * tN2 + var_He_b * tHe) / t; | |
| 2433 overlay float M0 = (a + pres_surface/b); | |
| 2434 | |
| 2435 //---- Add 10min/1min to N2/He tissues | |
| 2436 overlay float dTN2 = (ppN2 - tN2) * var_N2_e; | |
| 2437 overlay float dTHe = (ppHe - tHe) * var_He_e; | |
| 2438 | |
| 2439 //---- Apply safety margin for both models | |
| 2440 // NDL can be computed while ascending... SO we have | |
| 2441 // to check if we are saturating or desaturating. | |
| 2442 if( dTN2 > 0.0 ) dTN2 *= float_saturation_multiplier; | |
| 2443 else dTN2 *= float_desaturation_multiplier; | |
| 2444 | |
| 2445 if( dTHe > 0.0 ) dTHe *= float_saturation_multiplier; | |
| 2446 else dTHe *= float_saturation_multiplier; | |
| 2447 | |
| 2448 // adopt M0 value when using the GF extension | |
| 2449 if (char_I_deco_model != 0 ) M0 = GF_high * (M0 - pres_surface) + pres_surface; | |
| 2450 | |
| 2451 //---- Simulate off-gassing while going to surface | |
| 0 | 2452 // TODO ! |
| 2453 // dTN2 -= exp( ... ascent time ... ppN2...) | |
| 2454 // dTHe -= exp( ... ascent time ... ppHe...) | |
| 2455 | |
| 2456 //---- Ok now, and still ok to surface after 1 or 10 minutes ? | |
| 2457 if( (t <= M0) && (t + dTN2 + dTHe <= M0) ) | |
| 2458 { | |
| 560 | 2459 tN2 += dTN2; // YES: apply gas loadings, |
| 0 | 2460 tHe += dTHe; |
| 560 | 2461 t = tN2 + tHe; |
| 2462 | |
| 2463 ndl += period; // increment NDL, | |
| 2464 | |
| 2465 continue; // and loop. | |
| 0 | 2466 } |
| 2467 | |
| 2468 //---- Should we retry with smaller steps ? | |
| 2469 if( period == 10 ) | |
| 2470 { | |
| 560 | 2471 read_Buhlmann_times(1); // 1min coefs. |
| 0 | 2472 period = 1; |
| 560 | 2473 |
| 0 | 2474 continue; |
| 2475 } | |
| 2476 | |
| 2477 //---- ELSE make a linear approx for the last minute | |
| 560 | 2478 // Useful to have a meaningful rounding of NDL. |
| 2479 // But ONLY if positive (negative casted to unsigned is bad). | |
| 2480 if( M0 > t ) ndl += (unsigned char)(0.5f + (M0-t)/(dTN2+dTHe)); | |
| 2481 | |
| 0 | 2482 break; |
| 2483 } | |
| 2484 | |
| 2485 // Keep the shortest NDL found | |
| 560 | 2486 if ( ndl < nullzeit ) nullzeit = ndl; |
| 0 | 2487 } |
| 560 | 2488 |
| 2489 if( char_O_deco_status & DECO_PLAN_ALTERNATE) char_O_alternate_nullzeit = nullzeit; | |
| 2490 else char_O_nullzeit = nullzeit; | |
| 0 | 2491 } |
| 2492 | |
| 2493 ////////////////////////////////////////////////////////////////////////////// | |
| 2494 // calc_ascenttime | |
| 2495 // | |
| 560 | 2496 // Sum up ascent from bottom to surface at float_ascent_speed, |
| 2497 // but 1 minute per meter for the final ascent, and all stops. | |
| 0 | 2498 // |
| 560 | 2499 // Result in int_O_ascenttime, |
| 2500 // or int_O_alternate_ascenttime if doing the alternative plan. | |
| 2501 // | |
| 0 | 2502 static void calc_ascenttime(void) |
| 2503 { | |
| 560 | 2504 overlay unsigned char x; |
| 0 | 2505 overlay unsigned short sum; |
| 560 | 2506 |
| 2507 // preset final ascent | |
| 2508 overlay float final = (float)char_I_depth_last_deco; | |
| 2509 | |
| 2510 // calculate depth | |
| 2511 overlay float ascent = (pres_respiration - pres_surface) * BAR_TO_METER; | |
| 2512 | |
| 2513 // check if we are already in final ascent | |
| 2514 if (ascent <= final) | |
| 2515 { | |
| 2516 // yes - all ascent is final ascent | |
| 2517 final = ascent; | |
| 2518 ascent = 0.0; | |
| 2519 } | |
| 2520 else | |
| 2521 { | |
| 2522 // no - subtract final ascent part from overall ascent | |
| 2523 ascent -= final; | |
| 2524 | |
| 2525 // compute time for ascent part without final ascent | |
| 2526 ascent /= float_ascent_speed; | |
| 2527 } | |
| 2528 | |
| 2529 // add 1 minute for each meter of final ascent | |
| 2530 ascent += final; | |
| 2531 | |
| 2532 // convert to integer | |
| 2533 sum = (unsigned short)(ascent + 0.5); | |
| 2534 | |
| 2535 // add all stop times | |
| 0 | 2536 for(x=0; x<NUM_STOPS && internal_deco_depth[x]; x++) |
| 2537 sum += (unsigned short)internal_deco_time[x]; | |
| 2538 | |
| 560 | 2539 // limit result to display max. |
| 2540 if( sum > 999) sum = 999; | |
| 2541 | |
| 2542 // tag result as invalid if there is an overflow in the stops table | |
| 2543 if( char_O_deco_warnings & DECO_WARNING_STOPTABLE_OVERFLOW ) sum |= INT_FLAG_INVALID; | |
| 2544 | |
| 2545 // route result to output variable | |
| 2546 if( char_O_deco_status & DECO_PLAN_ALTERNATE ) int_O_alternate_ascenttime = sum; | |
| 2547 else int_O_ascenttime = sum; | |
| 0 | 2548 } |
| 2549 | |
| 2550 ////////////////////////////////////////////////////////////////////////////// | |
| 2551 // update_startvalues | |
| 2552 // | |
| 2553 // updated in v.102 | |
| 2554 // | |
| 2555 void update_startvalues(void) | |
| 2556 { | |
| 2557 overlay unsigned char x; | |
| 2558 | |
| 2559 // Start ascent simulation with current tissue partial pressures. | |
| 2560 for(x=0; x<NUM_COMP; x++) | |
| 2561 { | |
| 2562 sim_pres_tissue_N2[x] = pres_tissue_N2[x]; | |
| 2563 sim_pres_tissue_He[x] = pres_tissue_He[x]; | |
| 2564 } | |
| 2565 | |
| 2566 // No leading tissue (yet) for this ascent simulation. | |
| 2567 sim_lead_tissue_limit = 0.0; | |
| 560 | 2568 sim_lead_tissue_no = 1; |
| 0 | 2569 } |
| 2570 | |
| 2571 ////////////////////////////////////////////////////////////////////////////// | |
| 2572 // sim_limit() | |
| 2573 // | |
| 2574 // New in v.111 | |
| 2575 // | |
| 560 | 2576 // Function separated from calc_tissue() to allow recomputing limit on |
| 0 | 2577 // different depth, because it depends on current gradient factor. |
| 2578 // | |
| 2579 static void sim_limit(PARAMETER float GF_current) | |
| 2580 { | |
| 560 | 2581 assert( 0.0 < GF_current && GF_current <= 1.0 ); |
| 0 | 2582 |
| 2583 sim_lead_tissue_limit = 0.0; | |
| 560 | 2584 sim_lead_tissue_no = 0; // If no one is critic, keep first tissue. |
| 0 | 2585 |
| 2586 for(ci=0; ci<NUM_COMP; ci++) | |
| 2587 { | |
| 2588 overlay float N2 = sim_pres_tissue_N2[ci]; | |
| 2589 overlay float He = sim_pres_tissue_He[ci]; | |
| 2590 overlay float p = N2 + He; | |
| 2591 | |
| 560 | 2592 read_Buhlmann_coefficients(); |
| 0 | 2593 var_N2_a = (var_N2_a * N2 + var_He_a * He) / p; |
| 2594 var_N2_b = (var_N2_b * N2 + var_He_b * He) / p; | |
| 2595 | |
| 2596 // Apply the Eric Baker's varying gradient factor correction. | |
| 2597 // Note: the correction factor depends both on GF and b, | |
| 2598 // Actual values are in the 1.5 .. 1.0 range (for a GF=30%), | |
| 2599 // so that can change who is the leading gas... | |
| 2600 // Note: Also depends of the GF_current... | |
| 560 | 2601 if( char_I_deco_model != 0 ) p = ( p - (var_N2_a * GF_current) ) |
| 2602 / ( 1.0 - GF_current + (GF_current / var_N2_b ) ); | |
| 2603 | |
| 2604 else p = (p - var_N2_a) * var_N2_b; | |
| 2605 | |
| 0 | 2606 |
| 2607 if( p > sim_lead_tissue_limit ) | |
| 2608 { | |
| 560 | 2609 sim_lead_tissue_no = ci; |
| 0 | 2610 sim_lead_tissue_limit = p; |
| 2611 } | |
| 2612 } // for ci | |
| 2613 | |
| 2614 assert( sim_lead_tissue_no < NUM_COMP ); | |
| 2615 assert( 0.0 <= sim_lead_tissue_limit && sim_lead_tissue_limit <= 14.0 ); | |
| 2616 } | |
| 2617 | |
| 2618 ////////////////////////////////////////////////////////////////////////////// | |
| 2619 // clear_deco_table | |
| 2620 // | |
| 2621 // | |
| 2622 static void clear_deco_table(void) | |
| 2623 { | |
| 2624 overlay unsigned char x; | |
| 2625 | |
| 2626 for(x=0; x<NUM_STOPS; ++x) | |
| 2627 { | |
| 2628 internal_deco_time [x] = 0; | |
| 2629 internal_deco_depth[x] = 0; | |
| 2630 } | |
| 560 | 2631 |
| 2632 // clear stop table overflow warning | |
| 2633 char_O_deco_warnings &= ~DECO_WARNING_STOPTABLE_OVERFLOW; | |
| 0 | 2634 } |
| 2635 | |
| 2636 ////////////////////////////////////////////////////////////////////////////// | |
| 2637 // update_deco_table | |
| 2638 // | |
| 560 | 2639 // Add time to a stop at temp_depth_limit |
| 2640 // | |
| 2641 // It is possible to create stops with a duration of 0 minutes, e.g. to | |
| 2642 // note a gas change "on the fly" while ascending. Therefore the criteria | |
| 2643 // to have reached the end of the list needs always to be depth == 0. | |
| 0 | 2644 // |
| 560 | 2645 // Input: temp_depth_limit : stop's depth, in meters. |
| 2646 // sim_gas_last_used : gas used at stop, as index 1..5 or 0 for gas 6 | |
| 2647 // PARAMETER time_increment : number of minutes to add to the stop | |
| 0 | 2648 // |
| 560 | 2649 // Updated: internal_deco_depth[] : depth (in meters) of each stop |
| 2650 // internal_deco_time [] : time (in minutes) of each stop | |
| 2651 // internal_deco_gas [] : gas used (index 1-5) at each stop | |
| 2652 // | |
| 2653 static unsigned char update_deco_table(PARAMETER unsigned char time_increment) | |
| 0 | 2654 { |
| 560 | 2655 overlay unsigned char x; |
| 2656 | |
| 2657 assert( temp_depth_limit > 0 ); // No stop at surface... | |
| 2658 | |
| 2659 // loop through internal deco table | |
| 2660 for(x=0; x<NUM_STOPS; ++x) | |
| 2661 { | |
| 2662 // Make sure deco-stops are recorded in order: | |
| 2663 assert( !internal_deco_depth[x] || temp_depth_limit <= internal_deco_depth[x] ); | |
| 2664 | |
| 2665 // Is there already a stop entry for our current depth? | |
| 2666 if( internal_deco_depth[x] == temp_depth_limit ) | |
| 2667 { | |
| 2668 // Yes - increment stop time if possible | |
| 2669 // Stop time entries are limited to 99 minutes because of display constraints. | |
| 2670 // Else a limit of 254 would account because of constrains in calc_CNS_planning(). | |
| 2671 if( internal_deco_time[x] < (100 - time_increment) ) | |
| 2672 { | |
| 2673 internal_deco_time[x] += time_increment; // increment stop time | |
| 2674 return 1; // return with status 'success' | |
| 2675 } | |
| 2676 } | |
| 2677 | |
| 2678 // If program flow passes here, there is either no stop entry for the current depth yet, or | |
| 2679 // the existing entry is saturated with 99 minutes. So we are looking for the next unused | |
| 2680 // table entry. | |
| 2681 if( internal_deco_depth[x] == 0 ) | |
| 2682 { | |
| 2683 internal_deco_time[x] = time_increment; // initialize entry with first stop's time, | |
| 2684 internal_deco_depth[x] = temp_depth_limit; // ... depth, and | |
| 2685 internal_deco_gas[x] = sim_gas_last_used; // ... gas | |
| 2686 return 1; // return with status 'success' | |
| 2687 } | |
| 2688 } | |
| 2689 | |
| 2690 // If program flow passes here, all deco table entries are used up. | |
| 2691 | |
| 2692 // set overflow warning | |
| 2693 char_O_deco_warnings |= DECO_WARNING_STOPTABLE_OVERFLOW; | |
| 2694 | |
| 2695 | |
| 2696 // return with status 'failed'. | |
| 2697 return 0; | |
| 0 | 2698 } |
| 2699 | |
| 2700 ////////////////////////////////////////////////////////////////////////////// | |
| 2701 // calc_gradient_factor | |
| 2702 // | |
| 2703 // optimized in v.101 (var_N2_a) | |
| 2704 // new code in v.102 | |
| 2705 // | |
| 2706 static void calc_gradient_factor(void) | |
| 2707 { | |
| 2708 overlay float gf; | |
| 2709 overlay float N2 = pres_tissue_N2[char_O_gtissue_no]; | |
| 2710 overlay float He = pres_tissue_He[char_O_gtissue_no]; | |
| 2711 | |
| 2712 assert( char_O_gtissue_no < NUM_COMP ); | |
| 2713 assert( 0.800 <= pres_respiration && pres_respiration < 14.0 ); | |
| 2714 | |
| 560 | 2715 // tissue > respiration (currently off-gassing) |
| 2716 // GF = 0.00 when respiration == tissue, ie. dissolved gases are at equilibrium. | |
| 2717 // GF = 1.00 when respiration == limit. | |
| 0 | 2718 temp_tissue = N2 + He; |
| 2719 if( temp_tissue <= pres_respiration ) | |
| 560 | 2720 { |
| 0 | 2721 gf = 0.0; |
| 560 | 2722 int_O_gradient_factor = 0; |
| 2723 } | |
| 0 | 2724 else |
| 2725 { | |
| 2726 overlay float limit = calc_lead_tissue_limit; | |
| 2727 // NOTE: in GF model, calc_lead_tissue_limit include already the | |
| 2728 // correction due to gradient factor. To compute the actual | |
| 560 | 2729 // current GF, we need to (re-)compute the raw ambient-pressure |
| 313 | 2730 // limit from the Buhlmann model. |
| 0 | 2731 if( char_I_deco_model != 0 ) |
| 2732 { | |
| 2733 ci = char_O_gtissue_no; | |
| 560 | 2734 |
| 2735 read_Buhlmann_coefficients(); | |
| 2736 | |
| 0 | 2737 var_N2_a = (var_N2_a * N2 + var_He_a * He) / temp_tissue; |
| 2738 var_N2_b = (var_N2_b * N2 + var_He_b * He) / temp_tissue; | |
| 560 | 2739 |
| 2740 limit = (temp_tissue - var_N2_a) * var_N2_b; | |
| 0 | 2741 } |
| 2742 | |
| 560 | 2743 gf = (temp_tissue - pres_respiration) / (temp_tissue - limit); |
| 2744 | |
| 2745 // limit to 255 because of constraints in ghostwriter code | |
| 2746 if ( gf <= 0.0 ) int_O_gradient_factor = 0; | |
| 2747 else if( gf > 2.545 ) int_O_gradient_factor = 255 + INT_FLAG_WARNING; | |
| 2748 else | |
| 2749 { | |
| 2750 int_O_gradient_factor = (unsigned int)(100 * gf + 0.5); | |
| 2751 | |
| 2752 if ( int_O_gradient_factor >= GF_warning_threshold ) | |
| 2753 int_O_gradient_factor |= INT_FLAG_WARNING; | |
| 2754 | |
| 2755 else if ( int_O_gradient_factor >= char_I_GF_High_percentage ) | |
| 2756 int_O_gradient_factor |= INT_FLAG_PREWARNING; | |
| 2757 } | |
| 2758 } | |
| 0 | 2759 } |
| 2760 | |
| 2761 ////////////////////////////////////////////////////////////////////////////// | |
| 560 | 2762 // calc_desaturation_time |
| 0 | 2763 // |
| 2764 // Inputs: int_I_pres_surface, ppWater, char_I_desaturation_multiplier | |
| 560 | 2765 // Outputs: int_O_desaturation_time, int_O_nofly_time |
| 0 | 2766 // |
| 560 | 2767 // Helper function |
| 2768 // | |
| 2769 void calc_desaturation_time_helper(void) | |
| 0 | 2770 { |
| 560 | 2771 if( pres_actual > pres_target ) // check if actual pressure is higher then target pressure |
| 2772 { // YES - compute remaining time | |
| 2773 overlay float pres_ratio; | |
| 2774 | |
| 2775 pres_ratio = pres_actual / pres_target; | |
| 2776 | |
| 2777 // Compute desaturation time with result rounded up to multiples of 10 minutes. | |
| 2778 // Main purpose is to avoid confusion, because the times do not clock down in one minute steps any more | |
| 2779 // but get constantly re-computed according to current ambient pressure and may therefor make steps of | |
| 2780 // several minutes forwards and backwards as ambient pressure rises and falls. | |
| 2781 short_time = (unsigned short)( (var_ht * log(pres_ratio) / desat_factor) + 0.9 ); | |
| 2782 } | |
| 2783 else | |
| 2784 { // NO - desaturation state reached, no remaining time | |
| 2785 short_time = 0; | |
| 2786 } | |
| 2787 } | |
| 2788 | |
| 2789 ///////////////////////////////////////////////////////////////////////////// | |
| 2790 // Main function | |
| 2791 // | |
| 2792 void calc_desaturation_time(void) | |
| 2793 { | |
| 2794 assert( 800 < int_I_pres_surface && int_I_pres_surface < 1100 ); | |
| 2795 assert( 0 < char_I_desaturation_multiplier && char_I_desaturation_multiplier <= 100 ); | |
| 2796 | |
| 2797 | |
| 2798 N2_ratio = 0.7902; // fraction of N2 in respired air | |
| 2799 pres_surface = 0.001 * int_I_pres_surface; // surface pressure in bar | |
| 2800 N2_equilibrium = N2_ratio * (pres_surface - ppWater); // partial pressure of N2 in respired air | |
| 2801 desat_factor = 0.06931 * char_I_desaturation_multiplier * SURFACE_DESAT_FACTOR; // pre-computed term for later use: | |
| 2802 // 10 [Min] * 0.01 [%] * 0.6931 [ln(2)] * ... | |
| 2803 int_O_desaturation_time = 0; | |
| 2804 int_O_nofly_time = 0; | |
| 2805 | |
| 2806 | |
| 2807 for(ci=NUM_COMP; ci>0;) | |
| 0 | 2808 { |
| 560 | 2809 overlay float pres_tissue_max; |
| 2810 overlay float P_ambient_altitude; | |
| 2811 overlay signed char search_direction; | |
| 2812 overlay unsigned short nofly_N2 = 0; | |
| 2813 overlay unsigned short nofly_He = 0; | |
| 2814 overlay unsigned short nofly_last = ~0; | |
| 2815 | |
| 2816 | |
| 2817 ci -= 1; | |
| 2818 | |
| 2819 read_Buhlmann_ht(); | |
| 2820 read_Buhlmann_coefficients(); | |
| 2821 | |
| 2822 // get selected target altitude | |
| 2823 switch( char_I_altitude_wait ) | |
| 2824 { | |
| 2825 case 1: P_ambient_altitude = P_ambient_1000m; break; | |
| 2826 case 2: P_ambient_altitude = P_ambient_2000m; break; | |
| 2827 case 3: P_ambient_altitude = P_ambient_3000m; break; | |
| 2828 default: P_ambient_altitude = P_ambient_fly; break; | |
| 2829 } | |
| 2830 | |
| 2831 // Target pressure for the tissue is the Buhlmann limit. We use the Buhlmann | |
| 2832 // coefficients for N2 also for He because it is easier to calculate and the | |
| 2833 // N2 coefficients are more conservative than those for He, so we are on the | |
| 2834 // safe side, too. | |
| 2835 pres_tissue_max = (P_ambient_altitude/var_N2_b + var_N2_a); | |
| 2836 | |
| 2837 // Adjust target pressure in case the GF model is in use by GF-high | |
| 2838 if( char_I_deco_model != 0 ) | |
| 2839 { | |
| 2840 pres_tissue_max = ((pres_tissue_max - P_ambient_altitude) * char_I_GF_High_percentage * 0.01) + P_ambient_altitude; | |
| 2841 } | |
| 2842 | |
| 2843 | |
| 2844 // | |
| 2845 // Desaturation time | |
| 2846 // | |
| 2847 | |
| 2848 // N2: actual amount of tissue pressure above equilibrium. | |
| 2849 pres_actual = pres_tissue_N2[ci] - N2_equilibrium; | |
| 2850 | |
| 2851 // N2: half-time of the current tissue | |
| 2852 var_ht = var_N2_ht; | |
| 2853 | |
| 2854 // Calculate desaturation time for N2 in tissue. | |
| 2855 // Desaturated state is defined as residual tissue pressure <= 1.05 x ppN2 respired | |
| 2856 | |
| 2857 pres_target = 0.05 * N2_equilibrium; | |
| 2858 | |
| 2859 calc_desaturation_time_helper(); | |
| 2860 | |
| 2861 if( short_time > int_O_desaturation_time) int_O_desaturation_time = short_time; | |
| 2862 | |
| 2863 | |
| 2864 // He: actual amount of tissue pressure above equilibrium. | |
| 2865 pres_actual = pres_tissue_He[ci]; // equilibrium for He is 0 bar | |
| 2866 | |
| 2867 // He: half-time of the current tissue | |
| 2868 var_ht = var_He_ht; | |
| 2869 | |
| 2870 // Calculate desaturation time for He in the tissue. | |
| 2871 // Desaturated state is defined as residual tissue pressure <= 0.05 x ppN2 respired | |
| 2872 | |
| 2873 pres_target = 0.05 * N2_equilibrium; | |
| 2874 | |
| 2875 calc_desaturation_time_helper(); | |
| 2876 | |
| 2877 if( short_time > int_O_desaturation_time) int_O_desaturation_time = short_time; | |
| 2878 | |
| 2879 | |
| 2880 // | |
| 2881 // no-fly time | |
| 2882 // | |
| 2883 | |
| 2884 // initialize search direction | |
| 2885 search_direction = 0; | |
| 2886 | |
| 2887 for(;;) | |
| 2888 { | |
| 2889 // N2: actual amount of tissue pressure above equilibrium. | |
| 2890 pres_actual = pres_tissue_N2[ci] - N2_equilibrium; | |
| 2891 | |
| 2892 // N2: half-time of the current tissue | |
| 2893 var_ht = var_N2_ht; | |
| 2894 | |
| 2895 // Calculate no-fly time for N2 in the tissue. | |
| 2896 // Flying is permitted when the N2 pressure fits into the assigned fraction above equilibrium. | |
| 2897 | |
| 2898 pres_target = (split_N2_He[ci] * 0.01) * (pres_tissue_max - N2_equilibrium); | |
| 2899 | |
| 2900 if( pres_target < 0.0 ) // check if desaturation to fly target is possible | |
| 2901 { | |
| 2902 int_O_nofly_time = 288; // NO - set no-fly time to 288 * 10 min = 48 h | |
| 2903 break; // done for this compartment | |
| 2904 } | |
| 2905 else | |
| 2906 { | |
| 2907 calc_desaturation_time_helper(); | |
| 2908 nofly_N2 = short_time; | |
| 2909 } | |
| 2910 | |
| 2911 // He: actual amount of tissue pressure above equilibrium - equilibrium for He is 0 bar. | |
| 2912 pres_actual = pres_tissue_He[ci]; | |
| 2913 | |
| 2914 // He: half-time of the current tissue | |
| 2915 var_ht = var_He_ht; | |
| 2916 | |
| 2917 // Calculate no-fly time for He in the tissue. | |
| 2918 // Flying is permitted when the He pressure fits into the assigned fraction. | |
| 2919 | |
| 2920 pres_target = ((100 - split_N2_He[ci]) * 0.01) * (pres_tissue_max - N2_equilibrium); | |
| 2921 | |
| 2922 calc_desaturation_time_helper(); | |
| 2923 nofly_He = short_time; | |
| 2924 | |
| 2925 | |
| 2926 // Because the sum of N2 and He tissue pressures needs to fit into the Buhlmann limit for | |
| 2927 // no-fly time calculation, each gas gets assigned a fraction of the available total pressure | |
| 2928 // limit. The optimum split between the two gases can not be computed by a single formular, | |
| 2929 // because this would require the inversion of a function with two exponential terms, which is | |
| 2930 // not possible. We do not want to do a computational complex simulation here like it is done | |
| 2931 // in the deco calculation code (although we tackle the same base problem here), so we just let | |
| 2932 // the computer try out which split will balance the no-fly times induced by the N2 and the He | |
| 2933 // at best. | |
| 2934 | |
| 2935 // first of all, skip any optimization in case the current compartment is not the leading one | |
| 2936 if( (nofly_N2 <= int_O_nofly_time) && (nofly_He <= int_O_nofly_time) ) break; | |
| 2937 | |
| 2938 // check if the N2 requires more waiting time than the He | |
| 2939 if( nofly_N2 >= nofly_He ) | |
| 2940 { | |
| 2941 // check if the search direction has changed, which means we are beyond the | |
| 2942 // optimum now, or if we are at the upper stop limit of split_N2_He | |
| 2943 if( (search_direction < 0) || (split_N2_He[ci] == 99) ) | |
| 2944 { | |
| 2945 // Either the just completed iteration was more close to the optimum or the one before | |
| 2946 // was, so we take the best (i.e. shortest) time of both as the final no-fly time. | |
| 2947 int_O_nofly_time = (nofly_N2 < nofly_last) ? nofly_N2 : nofly_last; | |
| 2948 break; | |
| 2949 } | |
| 2950 | |
| 2951 // store the no-fly time found in this iteration | |
| 2952 nofly_last = nofly_N2; | |
| 2953 | |
| 2954 // increase the N2 fraction of the split and set search direction towards more N2 | |
| 2955 split_N2_He[ci] += 1; | |
| 2956 search_direction = +1; | |
| 2957 } | |
| 2958 else | |
| 2959 { | |
| 2960 // check if the search direction has changed, which means we are beyond the | |
| 2961 // optimum now, or if we are at the lower stop limit of split_N2_He | |
| 2962 if( (search_direction > 0) || (split_N2_He[ci] == 1) ) | |
| 2963 { | |
| 2964 // Either the just completed iteration was more close to the optimum or the one before | |
| 2965 // was, so we take the best (i.e. shortest) time of both as the final no-fly time. | |
| 2966 int_O_nofly_time = (nofly_He < nofly_last) ? nofly_He : nofly_last; | |
| 2967 break; | |
| 2968 } | |
| 2969 | |
| 2970 // store the no-fly time found in this iteration | |
| 2971 nofly_last = nofly_He; | |
| 2972 | |
| 2973 // decrease the N2 fraction of the split and set search direction towards less N2 | |
| 2974 split_N2_He[ci] -= 1; | |
| 2975 search_direction = -1; | |
| 2976 } | |
| 2977 | |
| 2978 } // for(;;) | |
| 2979 | |
| 2980 } // for(compartments) | |
| 2981 | |
| 2982 | |
| 2983 // Rescale int_O_desaturation_time and int_O_nofly_time to full minutes for display purpose | |
| 2984 int_O_desaturation_time *= 10; | |
| 2985 int_O_nofly_time *= 10; | |
| 2986 | |
| 2987 // Limit int_O_desaturation_time and int_O_nofly_time to 5999 = 99 hours + 59 minutes | |
| 2988 // because of display space constraints and rounding done above. | |
| 2989 if( int_O_desaturation_time > 5999 ) int_O_desaturation_time = 5999; | |
| 2990 if( int_O_nofly_time > 5999 ) int_O_nofly_time = 5999; | |
| 2991 | |
| 2992 | |
| 2993 // Clear the microbubbles warning when the current gradient factor is < GF_warning_threshold. | |
| 2994 // As the locked warning will stay set, this will cause the warning be be displayed in attention | |
| 2995 // color instead of warning color. | |
| 2996 if( int_O_gradient_factor < GF_warning_threshold ) char_O_deco_warnings &= ~DECO_WARNING_MBUBBLES; | |
| 2997 | |
| 2998 // clear some warnings when the desaturation time has become zero | |
| 2999 if( int_O_desaturation_time == 0 ) char_O_deco_warnings &= ~( DECO_WARNING_IBCD + DECO_WARNING_IBCD_lock | |
| 3000 + DECO_WARNING_MBUBBLES + DECO_WARNING_MBUBBLES_lock | |
| 3001 + DECO_WARNING_OUTSIDE + DECO_WARNING_OUTSIDE_lock ); | |
| 3002 | |
| 0 | 3003 } |
| 3004 | |
| 3005 ////////////////////////////////////////////////////////////////////////////// | |
| 3006 // calc_wo_deco_step_1_min | |
| 3007 // | |
| 3008 // optimized in v.101 (...saturation_multiplier) | |
| 3009 // desaturation slowed down to 70,42% | |
| 3010 // | |
| 560 | 3011 // Input: int_I_pres_surface [mbar] |
| 3012 // | |
| 0 | 3013 static void calc_wo_deco_step_1_min(void) |
| 3014 { | |
| 560 | 3015 assert( 800 < int_I_pres_surface && int_I_pres_surface < 1100 ); |
| 3016 assert( 100 <= char_I_saturation_multiplier && char_I_saturation_multiplier < 200 ); | |
| 3017 assert( 0 < char_I_desaturation_multiplier && char_I_desaturation_multiplier <= 100 ); | |
| 3018 | |
| 3019 // setup input data for deco routines | |
| 0 | 3020 pres_respiration = pres_surface = int_I_pres_surface * 0.001; |
| 560 | 3021 |
| 3022 N2_ratio = 0.7902; // according to Buhlmann | |
| 3023 N2_equilibrium = N2_ratio * (pres_surface - ppWater); // used for N2 tissue graphics scaling | |
| 3024 ppN2 = N2_ratio * (pres_respiration - ppWater); | |
| 3025 ppHe = 0.0; | |
| 3026 | |
| 3027 float_desaturation_multiplier = char_I_desaturation_multiplier * 0.01 * SURFACE_DESAT_FACTOR; | |
| 0 | 3028 float_saturation_multiplier = char_I_saturation_multiplier * 0.01; |
| 3029 | |
| 560 | 3030 |
| 3031 // program what to do: 128 = Flag for "real" tissues, 1 = 1 minute | |
| 3032 tissue_increment = 128 + 1; | |
| 3033 | |
| 3034 // update the pressure in the tissues N2/He in accordance with the new ambient pressure | |
| 3035 calc_tissue(); | |
| 3036 | |
| 3037 // clock down CNS by a 1 minute step | |
| 3038 //CNS_fraction *= 0.992327946; // is done in deco_calc_CNS_decrease_15min | |
| 3039 | |
| 3040 // compute integer copy of CNS value | |
| 3041 //compute_CNS_for_display(); // is done in deco_calc_CNS_decrease_15min | |
| 3042 | |
| 3043 // reset deco engine start condition (probably not needed to be done here...) | |
| 3044 char_O_deco_status &= ~DECO_STATUS_MASK; // clear bits | |
| 3045 char_O_deco_status |= DECO_STATUS_INIT; // set bits | |
| 3046 | |
| 3047 // reset some more data that are not applicable in surface mode | |
| 3048 char_O_nullzeit = 0; | |
| 3049 int_O_ascenttime = 0; | |
| 3050 int_O_alternate_ascenttime = 0; | |
| 3051 clear_deco_table(); | |
| 3052 | |
| 3053 // calculate gradient factor | |
| 0 | 3054 calc_gradient_factor(); |
| 3055 } | |
| 3056 | |
| 3057 ////////////////////////////////////////////////////////////////////////////// | |
| 3058 // calc_dive_interval | |
| 3059 // | |
| 3060 // Prepare tissue for delay before the next dive simulation. | |
| 3061 // | |
| 560 | 3062 // Inputs: char_I_dive_interval == delay before dive (in 1 Minute steps). |
| 3063 // Modified: CNS_fraction, int_O_CNS_fraction | |
| 3064 // pres_tissue_N2/He[] | |
| 0 | 3065 // |
| 3066 // Should be protected by deco_push_tissues_to_vault(), | |
| 3067 // deco_pull_tissues_from_vault() | |
| 3068 // | |
| 3069 // desaturation slowed down to 70,42%. | |
| 3070 // | |
| 3071 static void calc_dive_interval(void) | |
| 3072 { | |
| 3073 overlay unsigned char t; | |
|
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|
3074 |
| 0 | 3075 //---- Initialize simulation parameters ---------------------------------- |
| 3076 pres_respiration = pres_surface = int_I_pres_surface * 0.001; | |
| 560 | 3077 |
| 3078 N2_ratio = 0.7902; // according to buehlmann | |
| 3079 N2_equilibrium = N2_ratio * (pres_surface - ppWater); // used for N2 tissue graphics scaling | |
| 3080 ppN2 = N2_ratio * (pres_respiration - ppWater); | |
| 3081 ppHe = 0.0; | |
| 3082 | |
| 3083 float_desaturation_multiplier = char_I_desaturation_multiplier * 0.01 * SURFACE_DESAT_FACTOR; | |
| 0 | 3084 float_saturation_multiplier = char_I_saturation_multiplier * 0.01; |
| 560 | 3085 |
| 0 | 3086 //---- Perform simulation ------------------------------------------------ |
| 560 | 3087 |
| 3088 // Calculate tissues: | |
| 3089 // Because tissue_increment is limited to 127 minutes, we have to do two passes | |
| 3090 // in case char_I_dive_interval is bigger than 127. | |
| 3091 // Ops: char_I_dive_interval must be limited to 254! | |
| 3092 | |
| 3093 t = char_I_dive_interval; | |
| 3094 | |
| 3095 if ( t == 255 ) t = 254; | |
| 3096 | |
| 3097 if ( t > 127 ) // extra pass needed? | |
| 3098 { | |
| 3099 tissue_increment = 127 // dive interval length in minutes | |
| 3100 | 128; // Flag to update the "real" tissues | |
| 3101 | |
| 3102 calc_tissue(); // update tissues | |
| 3103 | |
| 3104 t -= 127; // calculate remaining dive interval length | |
| 3105 } | |
| 3106 | |
| 3107 tissue_increment = t // dive interval length in minutes to do | |
| 3108 | 128; // Flag to update the "real" tissues | |
| 3109 calc_tissue(); // update tissues | |
| 3110 | |
| 3111 | |
| 3112 // Calculate CNS: | |
| 3113 // To speed up things and because on most invocations of this code char_I_dive_interval | |
| 3114 // is a multiple of 10 minutes, we loop the loop-counter down using two speeds. | |
| 3115 | |
| 3116 t = char_I_dive_interval; | |
| 3117 | |
| 3118 while ( t ) | |
| 3119 { | |
| 3120 if( t > 9 ) | |
| 3121 { | |
| 3122 CNS_fraction *= 0.925874712; // Half-time = 90min -> 10 min: (1/2)^(1/9) | |
| 3123 t -= 10; // fast speed looping | |
| 3124 } | |
| 3125 else | |
| 3126 { | |
| 3127 CNS_fraction *= 0.992327946; // Half-time = 90min -> 1 min: (1/2)^(1/90) | |
| 3128 t -= 1; // slow speed looping | |
| 3129 } | |
| 3130 } | |
| 3131 | |
| 3132 // compute integer copy of CNS value | |
| 3133 compute_CNS_for_display(); | |
| 0 | 3134 } |
| 3135 | |
| 3136 ////////////////////////////////////////////////////////////////////////////// | |
| 560 | 3137 // clear_CNS_fraction |
| 0 | 3138 // |
| 560 | 3139 // new in v.101 |
| 0 | 3140 // |
| 560 | 3141 void clear_CNS_fraction(void) |
| 0 | 3142 { |
| 560 | 3143 CNS_fraction = CNS_sim_norm_fraction = CNS_sim_alt_fraction = 0; |
| 3144 int_O_CNS_fraction = int_O_normal_CNS_fraction = int_O_alternate_CNS_fraction = 0; | |
| 3145 } | |
| 3146 | |
| 3147 ////////////////////////////////////////////////////////////////////////////// | |
| 3148 // calc_CNS_fraction | |
| 3149 // | |
| 3150 // Input: char_actual_ppO2 : current ppO2 [decibars] | |
| 3151 // tissue_increment : time increment and tissue selector | |
| 3152 // CNS_fraction : current CNS% as float before period | |
| 3153 // | |
| 3154 // Output: CNS_fraction, int_O_CNS_fraction - for the real tissues | |
| 3155 // CNS_sim_norm_fraction, int_O_normal_CNS_fraction - in simulation mode, normal plan | |
| 3156 // CNS_sim_alt_fraction, int_O_alternate_CNS_fraction - in simulation mode, alternative plan | |
| 3157 // | |
| 3158 void calc_CNS_fraction(void) | |
| 3159 { | |
| 3160 overlay float time_factor = 1.0; // default is 2sec | |
| 3161 overlay float CNS_fraction_temp = 0.0; | |
| 3162 | |
| 3163 assert( char_actual_ppO2 > 15 ); | |
| 3164 | |
| 3165 // All deco code is now invoked every second. But as the CNS update is based on | |
| 3166 // 2 seconds periods, we skip every 2nd seconds-based invocation of this function. | |
| 3167 // 128 = 128 (flag for "real" CNS) + 0 (2 seconds period) | |
| 3168 // To distribute computational load, the CNS% is calculated in "the other second" | |
| 3169 // than the tissues. | |
| 3170 if( (tissue_increment == 128) && (twosectimer) ) return; | |
| 3171 | |
| 3172 // adjust time factor if minute-based stepping is commanded, mask out flag bit | |
| 3173 if( tissue_increment & 127 ) time_factor = 30.0 * (float)(tissue_increment & 127); | |
| 3174 | |
| 3175 | |
|
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3176 //------------------------------------------------------------------------ |
|
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|
3177 // Don't increase CNS below 0.5 bar, but keep it steady. |
| 560 | 3178 if (char_actual_ppO2 < 50) |
| 0 | 3179 ; // no changes |
|
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|
3180 //------------------------------------------------------------------------ |
|
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|
3181 // Below (and including) 1.60 bar |
| 560 | 3182 else if (char_actual_ppO2 < 61) |
| 3183 CNS_fraction_temp = time_factor/(-533.07 * char_actual_ppO2 + 54000.0); | |
| 3184 else if (char_actual_ppO2 < 71) | |
| 3185 CNS_fraction_temp = time_factor/(-444.22 * char_actual_ppO2 + 48600.0); | |
| 3186 else if (char_actual_ppO2 < 81) | |
| 3187 CNS_fraction_temp = time_factor/(-355.38 * char_actual_ppO2 + 42300.0); | |
| 3188 else if (char_actual_ppO2 < 91) | |
| 3189 CNS_fraction_temp = time_factor/(-266.53 * char_actual_ppO2 + 35100.0); | |
| 3190 else if (char_actual_ppO2 < 111) | |
| 3191 CNS_fraction_temp = time_factor/(-177.69 * char_actual_ppO2 + 27000.0); | |
| 3192 else if (char_actual_ppO2 < 152) | |
| 3193 CNS_fraction_temp = time_factor/( -88.84 * char_actual_ppO2 + 17100.0); | |
| 3194 else if (char_actual_ppO2 < 167) | |
| 3195 CNS_fraction_temp = time_factor/(-222.11 * char_actual_ppO2 + 37350.0); | |
|
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|
3196 //------------------------------------------------------------------------ |
|
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|
3197 // Arieli et all.(2002): Modeling pulmonary and CNS O2 toxicity: |
| 322 | 3198 // J Appl Physiol 92: 248--256, 2002, doi:10.1152/japplphysiol.00434.2001 |
|
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3199 // Formula (A1) based on value for 1.55 and c=20 |
|
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|
3200 // example calculation: Sqrt((1.7/1.55)^20)*0.000404 |
| 560 | 3201 else if (char_actual_ppO2 < 172) |
| 3202 CNS_fraction_temp = time_factor*0.00102; | |
| 3203 else if (char_actual_ppO2 < 177) | |
| 3204 CNS_fraction_temp = time_factor*0.00136; | |
| 3205 else if (char_actual_ppO2 < 182) | |
| 3206 CNS_fraction_temp = time_factor*0.00180; | |
| 3207 else if (char_actual_ppO2 < 187) | |
| 3208 CNS_fraction_temp = time_factor*0.00237; | |
| 3209 else if (char_actual_ppO2 < 192) | |
| 3210 CNS_fraction_temp = time_factor*0.00310; | |
| 3211 else if (char_actual_ppO2 < 198) | |
| 3212 CNS_fraction_temp = time_factor*0.00401; | |
| 3213 else if (char_actual_ppO2 < 203) | |
| 3214 CNS_fraction_temp = time_factor*0.00517; | |
| 3215 else if (char_actual_ppO2 < 233) | |
| 3216 CNS_fraction_temp = time_factor*0.0209; | |
| 0 | 3217 else |
| 560 | 3218 CNS_fraction_temp = time_factor*0.0482; // value for 2.5 bar, used for 2.33 bar and above |
| 3219 | |
| 3220 | |
| 3221 // Check from where we were called: | |
| 3222 // flag (bit 7) is set -> we were called from calc_hauptroutine() | |
| 3223 // flag (bit 7) not set -> we were called from the deco planning routines | |
| 3224 if ( tissue_increment & 128 ) CNS_fraction += CNS_fraction_temp; // real tissues | |
| 3225 else if ( char_O_deco_status & DECO_PLAN_ALTERNATE ) CNS_sim_alt_fraction += CNS_fraction_temp; // alternative plan | |
| 3226 else CNS_sim_norm_fraction += CNS_fraction_temp; // normal plan | |
| 3227 | |
| 0 | 3228 } |
| 3229 | |
| 3230 ////////////////////////////////////////////////////////////////////////////// | |
| 560 | 3231 // calc_CNS_planning |
| 0 | 3232 // |
| 3233 // Compute CNS during predicted ascent. | |
| 3234 // | |
| 3235 // Note: Needs a call to deco_push_tissues_to_vault(), | |
| 3236 // deco_pull_tissues_from_vault() to avoid trashing everything... | |
| 3237 // | |
| 560 | 3238 // Input: CNS_fraction, internal_deco_time[], internal_deco_depth[], internal_deco_gas[] |
| 3239 // Output: CNS_fraction, int_O_normal_CNS_fraction / int_O_alternate_CNS_fraction | |
| 0 | 3240 // |
| 560 | 3241 void calc_CNS_planning(void) |
| 0 | 3242 { |
| 560 | 3243 // start with CNS% we already have |
| 3244 if( char_O_deco_status & DECO_PLAN_ALTERNATE ) CNS_sim_alt_fraction = CNS_fraction; | |
| 3245 else CNS_sim_norm_fraction = CNS_fraction; | |
| 3246 | |
| 3247 | |
| 3248 //---- CCR mode : do the full TTS at once --------------------------------- | |
| 3249 | |
| 3250 if( ((char_O_deco_status & DECO_MODE_MASK) == DECO_MODE_CCR) ) | |
| 3251 { | |
| 3252 overlay unsigned short t; // needs 16 bits here ! | |
| 3253 | |
| 3254 // get current ppO2 from sensors or setpoint | |
| 3255 char_actual_ppO2 = char_I_const_ppO2; | |
| 3256 | |
| 3257 // calculate CNS% for the period of additional staying at bottom depth (fTTS / delayed ascent) | |
| 3258 if( char_O_deco_status & DECO_ASCENT_DELAYED) | |
| 3259 { | |
| 3260 tissue_increment = char_I_extra_time; // must be limited to 127, is limited by range of char_I_extra_time | |
| 3261 calc_CNS_fraction(); | |
| 3262 } | |
| 3263 | |
| 3264 // get the ascent time dependent on the current plan | |
| 3265 t = (char_O_deco_status & DECO_PLAN_ALTERNATE) ? int_O_alternate_ascenttime : int_O_ascenttime; | |
| 3266 | |
| 3267 // start simulating CNS% in chunks of 127 minutes | |
| 3268 tissue_increment = 127; | |
| 3269 | |
| 3270 while( t > 127 ) | |
| 3271 { | |
| 3272 t -= 127; // tissue_increment is limited to 127 minutes because of flag in bit 7 | |
| 3273 calc_CNS_fraction(); // calculate CNS in chunks of full 127 minutes | |
| 3274 } | |
| 3275 | |
| 3276 tissue_increment = (char)t; // get the remaining minutes <= 127 | |
| 3277 calc_CNS_fraction(); // calculate CNS for the remaining minutes | |
| 3278 } | |
| 3279 else //---- OC mode and pSCR without sensors: have to follow all gas switches... ----- | |
| 0 | 3280 { |
| 560 | 3281 overlay float float_actual_ppO2; |
| 3282 overlay float abs_pres; | |
| 3283 | |
| 3284 overlay unsigned char stop_depth; | |
| 3285 overlay unsigned char last_gas; | |
| 3286 overlay unsigned char i; // stop table index | |
| 3287 | |
| 3288 | |
| 3289 // retrieve bottom gas: 1-5 for the configured gases or 0 for the manually set gas | |
| 3290 last_gas = sim_gas_last_used = sim_gas_first_used; | |
| 3291 | |
| 3292 // get the calc_N2/He/O2_ratios of the bottom gas | |
| 3293 gas_switch_set(); | |
| 3294 | |
| 3295 // calculate absolute pressure | |
| 3296 abs_pres = pres_surface + bottom_depth * METER_TO_BAR; | |
| 3297 | |
| 3298 // switch on deco mode pSCR / OC | |
| 3299 if( char_O_deco_status & DECO_MODE_PSCR ) | |
| 3300 { | |
| 3301 //---- pSCR calculated -------------------------------------------- | |
| 3302 | |
| 3303 // abs_pres is 0.0 ... in bar | |
| 3304 // calc_O2_ratio is 0.0 ... 1.0 as factor | |
| 3305 // char_I_PSCR_drop is 0 ... 15 as % | |
| 3306 // char_I_PSCR_lungratio is 5 ... 20 as % | |
| 3307 // float_actual_ppO2 is 0.0 ... in cbar (!) | |
| 3308 | |
| 3309 float_actual_ppO2 = (100 * abs_pres * calc_O2_ratio) | |
| 3310 - (1.0 - calc_O2_ratio) * char_I_PSCR_drop * char_I_PSCR_lungratio; | |
| 3311 } | |
| 3312 else | |
| 3313 { | |
| 3314 //---- OC --------------------------------------------------------- | |
| 3315 | |
| 3316 float_actual_ppO2 = abs_pres * calc_O2_ratio * 100; // in cbar (!) | |
| 3317 } | |
| 3318 | |
| 3319 // caution: float_actual_ppO2 is in cbar here! | |
| 3320 if ( float_actual_ppO2 < 0.0 ) char_actual_ppO2 = 0; | |
| 3321 else if ( float_actual_ppO2 > 254.5 ) char_actual_ppO2 = 255; | |
| 3322 else char_actual_ppO2 = (unsigned char)(float_actual_ppO2 + 0.5); | |
| 3323 | |
| 3324 | |
| 3325 // simulate extended bottom time (fTTS) / delay before ascent (bailout) if configured | |
| 3326 if( char_O_deco_status & DECO_ASCENT_DELAYED ) | |
| 3327 { | |
| 3328 tissue_increment = char_I_extra_time; // must be limited to 127, is limited by range of char_I_extra_time | |
| 3329 calc_CNS_fraction(); | |
| 3330 } | |
| 3331 | |
| 3332 | |
| 3333 // For simplicity reason (non-linearity of the relation between ppO2 and CNS increments), the | |
| 3334 // whole ascent is calculated with bottom ppO2. This errs, but it does so to the safe side. | |
| 3335 | |
| 3336 // calculate ascent time (integer division and generous round-up) | |
| 3337 tissue_increment = bottom_depth / char_I_ascent_speed + 1; | |
| 3338 | |
| 3339 // ** commented out - not needed when char_I_ascent_speed is limited to a | |
| 3340 // ** minimum of 2.something, it is indeed limited to 5. | |
| 3341 // | |
| 3342 // // limit tissue_increment to 127 minutes | |
| 3343 // if( tissue_increment > 127 ) tissue_increment = 127; | |
| 3344 | |
| 3345 // simulate the CNS increase | |
| 3346 calc_CNS_fraction(); | |
| 3347 | |
| 3348 | |
| 3349 //---- Stops --------------------------------------------------------- | |
| 3350 | |
| 0 | 3351 for(i=0; i<NUM_STOPS; ++i) |
| 3352 { | |
| 560 | 3353 // get the depth of the stop |
| 3354 stop_depth = internal_deco_depth[i]; | |
| 3355 | |
| 3356 // did we reach the last entry (depth = 0)? if yes, done | |
| 3357 if (stop_depth == 0) break; | |
| 3358 | |
| 3359 // get the duration of the stop and the gas breathed | |
| 3360 tissue_increment = internal_deco_time[i]; | |
| 3361 sim_gas_last_used = internal_deco_gas[i]; | |
| 3362 | |
| 3363 // do we have a gas switch? | |
| 3364 if( sim_gas_last_used != last_gas ) | |
| 0 | 3365 { |
| 560 | 3366 // yes - get new calc ratios |
| 3367 gas_switch_set(); | |
| 3368 | |
| 3369 // remember new gas as last gas | |
| 3370 last_gas = sim_gas_last_used; | |
| 3371 } | |
| 3372 | |
| 3373 // calculate absolute pressure at stop depth | |
| 3374 abs_pres = pres_surface + stop_depth * METER_TO_BAR; | |
| 3375 | |
| 3376 // pSCR mode | |
| 3377 if( char_O_deco_status & DECO_MODE_PSCR ) | |
| 3378 { | |
| 3379 // abs_pres is 0.0 ... in bar | |
| 3380 // calc_O2_ratio is 0.0 ... 1.0 as factor | |
| 3381 // char_I_PSCR_drop is 0 ... 15 as % | |
| 3382 // char_I_PSCR_lungratio is 5 ... 20 as % | |
| 3383 // float_actual_ppO2 is 0.0 ... in cbar (!) | |
| 3384 | |
| 3385 float_actual_ppO2 = (100 * abs_pres * calc_O2_ratio) | |
| 3386 - (1.0 - calc_O2_ratio) * char_I_PSCR_drop * char_I_PSCR_lungratio; | |
| 3387 } | |
| 3388 else // OC mode | |
| 3389 { | |
| 3390 float_actual_ppO2 = abs_pres * calc_O2_ratio * 100; // in cbar (!) | |
| 3391 } | |
| 3392 | |
| 3393 // caution: float_actual_ppO2 is in cbar here! | |
| 3394 if ( float_actual_ppO2 < 0.0 ) char_actual_ppO2 = 0; | |
| 3395 else if ( float_actual_ppO2 > 254.5 ) char_actual_ppO2 = 255; | |
| 3396 else char_actual_ppO2 = (unsigned char)(float_actual_ppO2 + 0.5); | |
| 3397 | |
| 3398 | |
| 3399 // ** Currently, stop times per stop entry are limited to 99 minutes in update_deco_table(), | |
| 3400 // ** so the following code block is not needed at times. | |
| 3401 // | |
| 3402 // // tissue_increment is limited to 127 when fed to deco_calc_CNS_fraction(), | |
| 3403 // // so if the stop is longer than 127 minutes (but not longer than 254 minutes!) | |
| 3404 // // we need to calculate the CNS in two chunks. | |
| 3405 // if( tissue_increment > 127) | |
| 3406 // { | |
| 3407 // tissue_increment -= 127; // subtract full 127 minutes and do the "remaining" minutes first | |
| 3408 // calc_CNS_fraction(); | |
| 3409 // tissue_increment = 127; // catch up with the previously subtracted full 127 minutes | |
| 3410 // } | |
| 3411 | |
| 3412 // calculate CNS% for the stop | |
| 3413 calc_CNS_fraction(); | |
| 0 | 3414 } |
| 3415 } | |
| 3416 } | |
| 3417 | |
| 560 | 3418 |
| 0 | 3419 ////////////////////////////////////////////////////////////////////////////// |
| 560 | 3420 // gas_volumes |
| 3421 // | |
| 3422 // calculates volumes and required tank fill pressures for each gas. | |
| 0 | 3423 // |
| 560 | 3424 // Input: bottom_depth depth of the bottom segment |
| 3425 // char_I_bottom_time duration of the bottom segment | |
| 3426 // char_I_extra_time extra bottom time for fTTS / delayed ascent | |
| 3427 // float_ascent_speed ascent speed, in meters/minute | |
| 3428 // sim_gas_first_used the bottom gas (1-5 for configured gases, 0 for the manual gas) | |
| 3429 // internal_deco_depth[] depth of the stops | |
| 3430 // internal_deco_time[] duration of the stops | |
| 3431 // internal_deco_gas[] gas breathed at the stops | |
| 3432 // char_I_bottom_usage gas consumption during bottom part and initial ascent, in liters/minute | |
| 3433 // char_I_deco_usage gas consumption during stops and following ascents, in liters/minute | |
| 3434 // char_I_tank_size[] size of the tanks for gas 1-5, in liters | |
| 3435 // char_I_tank_pres_fill[] fill pressure of the tanks | |
| 0 | 3436 // |
| 560 | 3437 // Output: int_O_gas_volumes[] amount of gas needed, in liters |
| 3438 // int_O_tank_pres_need[] in bar, + flags for fast evaluation by dive mode warnings: | |
| 3439 // 2^15: pres_need >= pres_fill | |
| 3440 // 2^14: pres_need >= press_fill * GAS_NEEDS_ATTENTION_THRESHOLD | |
| 3441 // 2^11: pres_need == 0 | |
| 3442 // 2^10: pres_need invalid | |
| 0 | 3443 // |
| 560 | 3444 void gas_volumes_helper(void) |
| 3445 { | |
| 3446 // Calculate the gas volume needed at a given depth, time and usage (SAC rate). | |
| 3447 // We use 1.0 for the surface pressure to have stable results when used through | |
| 3448 // the deco calculator (simulation mode). | |
| 3449 volume = (float_depth * METER_TO_BAR + 1.0) * float_time * usage; | |
| 3450 | |
| 3451 return; | |
| 3452 } | |
| 3453 | |
| 3454 void gas_volumes(void) | |
| 0 | 3455 { |
| 560 | 3456 overlay float volumes[NUM_GAS]; |
| 3457 | |
| 3458 overlay unsigned char stop_gas; | |
| 3459 overlay unsigned char stop_gas_last; | |
| 3460 overlay unsigned char stop_time; | |
| 3461 overlay unsigned char stop_depth; | |
| 3462 overlay unsigned char stop_depth_last; | |
| 3463 overlay unsigned char i; | |
| 3464 | |
| 3465 | |
| 3466 //---- initialization ---------------------------------------------------- | |
| 3467 | |
| 3468 // null the volume accumulators | |
| 3469 for(i=0; i<NUM_GAS; ++i) volumes[i] = 0.0; | |
| 3470 | |
| 3471 // quit for CCR and pSCR mode | |
| 3472 if( char_O_deco_status & DECO_MODE_LOOP ) goto done; | |
| 3473 | |
| 3474 | |
| 3475 //---- bottom demand ----------------------------------------------------- | |
| 3476 | |
| 3477 // sim_gas_first_used : gas used during bottom segment (0, 1-5) | |
| 3478 // bottom_depth: depth of the bottom segment | |
| 3479 | |
| 3480 assert(0 <= sim_gas_first_used && sim_gas_first_used <= NUM_GAS); | |
| 3481 | |
| 3482 // get the gas used during bottom segment | |
| 3483 stop_gas_last = stop_gas = sim_gas_first_used; | |
| 3484 | |
| 3485 // set the usage (SAC rate) to bottom usage rate for bottom part and initial ascent | |
| 3486 usage = char_I_bottom_usage; | |
| 3487 | |
| 3488 // volumes are only calculated for gases 1-5, but not the manually configured one | |
| 3489 if( stop_gas ) | |
| 3490 { | |
| 3491 // set the bottom depth | |
| 3492 float_depth = (float)bottom_depth; | |
| 3493 | |
| 3494 // calculate either bottom segment or just the fTTS/bailout delayed part | |
| 3495 if( char_O_main_status & DECO_BOTTOM_CALCULATE ) | |
| 3496 { | |
| 3497 // duration of bottom segment | |
| 3498 float_time = (float)char_I_bottom_time; | |
| 3499 } | |
| 3500 else | |
| 3501 { | |
| 3502 // duration of delayed ascent | |
| 3503 float_time = (float)char_I_extra_time; | |
| 3504 } | |
| 3505 | |
| 3506 // calculate gas demand | |
| 3507 gas_volumes_helper(); | |
| 3508 | |
| 3509 // take result | |
| 3510 volumes[stop_gas-1] = volume; | |
| 3511 } | |
| 3512 | |
| 3513 | |
| 3514 // initialize stop index with first stop | |
| 3515 i = 0; | |
| 3516 | |
| 3517 | |
| 3518 //---- initial ascent demand --------------------------------------------- | |
| 3519 | |
| 3520 // stop_gas : gas from bottom segment | |
| 3521 // bottom_depth : depth of the bottom segment in meters | |
| 3522 // internal_deco_depth[i=0]: depth of the first stop, may be 0 if no stop exists | |
| 3523 | |
| 3524 // get the data of the first stop | |
| 3525 stop_depth = internal_deco_depth[i]; | |
| 3526 stop_time = internal_deco_time[i]; | |
| 3527 | |
| 3528 // volumes are only calculated for gases 1-5, but not the manually configured one | |
| 3529 if( stop_gas ) | |
| 3530 { | |
| 3531 // compute distance between bottom and first stop | |
| 3532 float_depth = (float)bottom_depth - (float)stop_depth; | |
| 3533 | |
| 3534 // initial ascent exists only if ascent distance is > 0 | |
| 3535 if( float_depth > 0.0 ) | |
| 3536 { | |
| 3537 // compute ascent time | |
| 3538 float_time = float_depth / float_ascent_speed; | |
| 3539 | |
| 3540 // compute average depth between bottom and first stop | |
| 3541 float_depth = (float)bottom_depth - float_depth * 0.5; | |
| 3542 | |
| 3543 // calculate gas demand | |
| 3544 gas_volumes_helper(); | |
| 3545 | |
| 3546 // add result | |
| 3547 volumes[stop_gas-1] += volume; | |
| 3548 } | |
| 3549 } | |
| 3550 | |
| 3551 // switch the usage (SAC rate) to deco usage rate | |
| 3552 // for stops, intermediate and final ascent | |
| 3553 usage = char_I_deco_usage; | |
| 3554 | |
| 3555 // is there a (first) stop? if yes, goto stops processing | |
| 3556 if( stop_depth ) goto stops; | |
| 3557 | |
| 3558 // add demand of a 3 minutes safety stop at 5 meters, at least for contingency... | |
| 3559 float_time = 3.0; | |
| 3560 float_depth = 5.0; | |
| 3561 | |
| 3562 // calculate gas demand | |
| 3563 gas_volumes_helper(); | |
| 3564 | |
| 3565 // add result | |
| 3566 volumes[stop_gas-1] += volume; | |
| 3567 | |
| 3568 // proceed to volume conversion and pressure calculations | |
| 3569 goto done; | |
| 3570 | |
| 3571 | |
| 3572 //---- intermediate ascent demand --------------------------------------- | |
| 3573 inter_ascents: | |
| 3574 | |
| 3575 // store last stop depth and gas | |
| 3576 stop_depth_last = stop_depth; | |
| 3577 stop_gas_last = stop_gas; | |
| 3578 | |
| 3579 // check if we are at the end of the stops table | |
| 3580 if( i < NUM_STOPS-1 ) | |
| 3581 { | |
| 3582 // there are more entries - get the next stop data | |
| 3583 i++; | |
| 3584 | |
| 3585 // get the next stop depth | |
| 3586 stop_depth = internal_deco_depth[i]; | |
| 3587 | |
| 3588 // check if there is indeed another stop, | |
| 3589 // if not (depth = 0) treat as end of table | |
| 3590 if( stop_depth == 0 ) goto end_of_table; | |
| 3591 | |
| 3592 // get the next stop duration | |
| 3593 stop_time = internal_deco_time[i]; | |
| 3594 } | |
| 3595 else | |
| 3596 { | |
| 3597 end_of_table: | |
| 3598 | |
| 3599 // End of the stops table reached or no more stops: Split the remaining | |
| 3600 // ascent into an intermediate ascent and a final ascent by creating a | |
| 3601 // dummy stop at the usual last deco stop depth. Stop gas doesn't change. | |
| 3602 stop_time = 0; | |
| 3603 stop_depth = char_I_depth_last_deco; | |
| 3604 } | |
| 3605 | |
| 3606 // volumes are only calculated for gases 1-5, but not the manually configured one | |
| 3607 if( stop_gas_last ) | |
| 3608 { | |
| 3609 // compute distance between the two stops: | |
| 3610 // last stop will always be deeper than current stop | |
| 3611 float_depth = (float)(stop_depth_last - stop_depth); | |
| 3612 | |
| 3613 // compute ascent time | |
| 3614 float_time = float_depth / float_ascent_speed; | |
| 3615 | |
| 3616 // compute average depth between the two stops | |
| 3617 float_depth = (float)stop_depth_last - float_depth * 0.5; | |
| 3618 | |
| 3619 // calculate gas demand | |
| 3620 gas_volumes_helper(); | |
| 3621 | |
| 3622 // add result | |
| 3623 volumes[stop_gas_last-1] += volume; | |
| 3624 } | |
| 3625 | |
| 3626 | |
| 3627 //---- next stop demand ------------------------------------------------- | |
| 3628 stops: | |
| 3629 | |
| 3630 // convert depth of the stop | |
| 3631 float_depth = (float)stop_depth; | |
| 3632 | |
| 3633 // get the next gas | |
| 3634 stop_gas = internal_deco_gas[i]; | |
| 3635 | |
| 3636 // do we we have a gas change? | |
| 3637 if( stop_gas_last && (stop_gas != stop_gas_last) ) | |
| 3638 { | |
| 3639 // yes - spend an additional char_I_gas_change_time on the old gas | |
| 3640 float_time = (float)char_I_gas_change_time; | |
| 3641 | |
| 3642 // calculate gas demand | |
| 3643 gas_volumes_helper(); | |
| 3644 | |
| 3645 // add result | |
| 3646 volumes[stop_gas_last-1] += volume; | |
| 3647 } | |
| 3648 | |
| 3649 // calculate and add demand on new gas for the full stop duration | |
| 3650 if( stop_gas ) | |
| 3651 { | |
| 3652 // get the duration of the stop | |
| 3653 float_time = (float)stop_time; | |
| 3654 | |
| 3655 // calculate gas demand | |
| 3656 gas_volumes_helper(); | |
| 3657 | |
| 3658 // add result to last gas | |
| 3659 volumes[stop_gas-1] += volume; | |
| 3660 } | |
| 3661 | |
| 3662 // continue with the next intermediate ascent if this was not the last stop | |
| 3663 if( stop_depth > char_I_depth_last_deco ) goto inter_ascents; | |
| 3664 | |
| 3665 | |
| 3666 //---- final ascent demand ----------------------------------------------- | |
| 3667 final_ascent: | |
| 3668 | |
| 3669 // float_depth: depth of last stop | |
| 3670 // stop_gas : gas from last stop (0 or 1-5) | |
| 3671 | |
| 3672 // volumes are only calculated for gases 1-5, but not the manually configured one | |
| 3673 if( stop_gas ) | |
| 3674 { | |
| 3675 // set ascent time according to an ascent speed of 1 meter per minute | |
| 3676 float_time = float_depth; | |
| 3677 | |
| 3678 // set half-way depth | |
| 3679 float_depth *= 0.5; | |
| 3680 | |
| 3681 // calculate gas demand | |
| 3682 gas_volumes_helper(); | |
| 3683 | |
| 3684 // add result | |
| 3685 volumes[stop_gas-1] += volume; | |
| 3686 } | |
| 3687 | |
| 3688 | |
| 3689 //---- convert results for the assembler interface ----------------------------- | |
| 3690 done: | |
| 3691 | |
| 3692 for(i=0; i<NUM_GAS; ++i) | |
| 3693 { | |
| 3694 if( volumes[i] >= 65534.5 ) | |
| 3695 { | |
| 3696 int_O_gas_volumes[i] = 65535; | |
| 3697 int_O_tank_pres_need[i] = 999 + INT_FLAG_WARNING; // 999 bar + warning flag for > pres_fill | |
| 3698 } | |
| 3699 else | |
| 3700 { | |
| 3701 overlay unsigned short tank_pres_fill = 10.0 * (unsigned short)char_I_tank_pres_fill[i]; | |
| 3702 | |
| 3703 // No distinct rounding done here because volumes are not accurate to the single liter anyhow | |
| 3704 | |
| 3705 // convert gas volumes to integers | |
| 3706 int_O_gas_volumes[i] = (unsigned short)volumes[i]; | |
| 3707 | |
| 3708 // compute how much pressure in the tank will be needed [in bar] (integer-division) | |
| 3709 int_O_tank_pres_need[i] = (unsigned short)(int_O_gas_volumes[i] / char_I_tank_size[i]); | |
| 3710 | |
| 3711 // limit to 999 bar because of display constraints | |
| 3712 if( int_O_tank_pres_need[i] > 999 ) int_O_tank_pres_need[i] = 999; | |
| 3713 | |
| 3714 // set flags for fast evaluation by divemode check for warnings | |
| 3715 if ( int_O_tank_pres_need[i] == 0 ) | |
| 3716 { | |
| 3717 // set flag for 0 bar | |
| 3718 int_O_tank_pres_need[i] |= INT_FLAG_ZERO; | |
| 3719 } | |
| 3720 else if( int_O_tank_pres_need[i] >= tank_pres_fill ) | |
| 3721 { | |
| 3722 // set warning flag | |
| 3723 int_O_tank_pres_need[i] |= INT_FLAG_WARNING; | |
| 3724 | |
| 3725 } | |
| 3726 else if( int_O_tank_pres_need[i] >= tank_pres_fill * GAS_NEEDS_ATTENTION_THRESHOLD ) | |
| 3727 { | |
| 3728 // set pre-warning flag | |
| 3729 int_O_tank_pres_need[i] |= INT_FLAG_PREWARNING; | |
| 3730 } | |
| 3731 | |
| 3732 // set invalid flag if there is an overflow in the stops table | |
| 3733 if( char_O_deco_warnings & DECO_WARNING_STOPTABLE_OVERFLOW ) | |
| 3734 int_O_tank_pres_need[i] |= INT_FLAG_INVALID; | |
| 3735 | |
| 3736 } // if( volumes[i] ) | |
| 3737 } // for | |
| 0 | 3738 } |
| 3739 | |
| 3740 ////////////////////////////////////////////////////////////////////////////// | |
| 560 | 3741 |
| 3742 void compute_CNS_for_display(void) | |
| 0 | 3743 { |
| 560 | 3744 if ( CNS_fraction < 0.01 ) int_O_CNS_fraction = 0; |
| 3745 else if ( CNS_fraction >= 9.985 ) int_O_CNS_fraction = 999 + INT_FLAG_WARNING; | |
| 3746 else | |
| 3747 { | |
| 3748 // convert float to integer | |
| 3749 int_O_CNS_fraction = (unsigned short)(100 * CNS_fraction + 0.5); | |
| 3750 | |
| 3751 // compute warnings | |
| 3752 if ( int_O_CNS_fraction >= CNS_warning_threshold ) | |
| 3753 { | |
| 3754 // reset pre-warning and set main warning flag | |
| 3755 int_O_CNS_fraction &= ~INT_FLAG_PREWARNING; | |
| 3756 int_O_CNS_fraction |= INT_FLAG_WARNING; | |
| 3757 } | |
| 3758 else if ( int_O_CNS_fraction >= CNS_prewarning_threshold ) | |
| 3759 { | |
| 3760 // reset main warning but set pre-warning flag | |
| 3761 int_O_CNS_fraction &= ~INT_FLAG_WARNING; | |
| 3762 int_O_CNS_fraction |= INT_FLAG_PREWARNING; | |
| 3763 } | |
| 3764 else | |
| 3765 { | |
| 3766 // clear both warnings | |
| 3767 int_O_CNS_fraction &= ~(INT_FLAG_WARNING + INT_FLAG_PREWARNING); | |
| 3768 } | |
| 3769 } | |
| 0 | 3770 } |
| 3771 | |
| 3772 ////////////////////////////////////////////////////////////////////////////// | |
| 3773 | |
| 3774 void deco_push_tissues_to_vault(void) | |
| 3775 { | |
| 3776 overlay unsigned char x; | |
| 560 | 3777 |
| 0 | 3778 RESET_C_STACK |
| 3779 | |
| 560 | 3780 low_depth_norm_vault = low_depth_norm; |
| 3781 low_depth_alt_vault = low_depth_alt; | |
| 3782 cns_vault_float = CNS_fraction; | |
| 3783 cns_vault_int = int_O_CNS_fraction; | |
| 3784 deco_warnings_vault = char_O_deco_warnings; | |
| 0 | 3785 |
| 3786 for (x=0;x<NUM_COMP;x++) | |
| 3787 { | |
| 3788 pres_tissue_N2_vault[x] = pres_tissue_N2[x]; | |
| 3789 pres_tissue_He_vault[x] = pres_tissue_He[x]; | |
| 3790 } | |
| 3791 } | |
| 3792 | |
| 3793 void deco_pull_tissues_from_vault(void) | |
| 3794 { | |
| 3795 overlay unsigned char x; | |
| 560 | 3796 |
| 0 | 3797 RESET_C_STACK |
| 3798 | |
| 560 | 3799 low_depth_norm = low_depth_norm_vault; |
| 3800 low_depth_alt = low_depth_alt_vault; | |
| 3801 CNS_fraction = cns_vault_float; | |
| 3802 int_O_CNS_fraction = cns_vault_int; | |
| 3803 char_O_deco_warnings = deco_warnings_vault; | |
| 3804 | |
| 3805 locked_GF_step_norm = GF_delta / low_depth_norm; | |
| 3806 locked_GF_step_alt = GF_delta / low_depth_alt; | |
| 3807 | |
| 0 | 3808 for (x=0; x<NUM_COMP; x++) |
| 3809 { | |
| 3810 pres_tissue_N2[x] = pres_tissue_N2_vault[x]; | |
| 3811 pres_tissue_He[x] = pres_tissue_He_vault[x]; | |
| 3812 } | |
| 3813 } | |
| 3814 | |
| 3815 ////////////////////////////////////////////////////////////////////////////// | |
| 3816 // | |
| 3817 #ifndef CROSS_COMPILE | |
| 3818 void main() {} | |
| 3819 #endif |