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view Common/Src/decom.c @ 796:75ace7af8212
Expanded Sensor map structure:
In the previous version the number of possible sensors were set to 5 based on the assumption that ADC slots are shared with digital O2 sensors. As result three of five slots would have been limited to O2 measurement usecase, leaving just two slots left for other sensors (e.g. CO2). In order to have as much flexibility (and less risk for data structure changes) the number of sensors has been set to 7 (3 ADC + 4 UART MUX)
| author | Ideenmodellierer |
|---|---|
| date | Mon, 31 Jul 2023 20:00:06 +0200 |
| parents | 9bc817e9e221 |
| children | 012f94ec2fe0 |
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/////////////////////////////////////////////////////////////////////////////// /// -*- coding: UTF-8 -*- /// /// \file Common/Src/decom.c /// \brief This code is used to calculate desat, calculated by RTE and send to Firmware /// \author heinrichs weikamp gmbh /// \date 22-Feb-2016 /// /// $Id$ /////////////////////////////////////////////////////////////////////////////// /// \par Copyright (c) 2014-2018 Heinrichs Weikamp gmbh /// /// This program is free software: you can redistribute it and/or modify /// it under the terms of the GNU General Public License as published by /// the Free Software Foundation, either version 3 of the License, or /// (at your option) any later version. /// /// This program is distributed in the hope that it will be useful, /// but WITHOUT ANY WARRANTY; without even the implied warranty of /// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the /// GNU General Public License for more details. /// /// You should have received a copy of the GNU General Public License /// along with this program. If not, see <http://www.gnu.org/licenses/>. ////////////////////////////////////////////////////////////////////////////// /** @verbatim ============================================================================== ##### Changes ##### ============================================================================== V1.0.2 1602220x decom_oxygen_calculate_cns() changed to hwOS version @endverbatim ****************************************************************************** */ #include "decom.h" #include <math.h> #include "settings.h" #include "calc_crush.h" # define FRACTION_N2_AIR 0.7902 const float helium_time_constant[16] = { 3.68695308808482E-001, 2.29518933960247E-001, 1.46853216220327E-001, 9.91626867753856E-002, 6.78890480470074E-002, 4.78692804254106E-002, 3.37626488338989E-002, 2.38113081607676E-002, 1.68239606932026E-002, 1.25592893741610E-002, 9.80544886914621E-003, 7.67264977374303E-003, 6.01220557342307E-003, 4.70185307665137E-003, 3.68225234041620E-003, 2.88775228329769E-003}; const float nitrogen_time_constant[16] = { 1.38629436111989E-001, 8.66433975699932E-002, 5.54517744447956E-002, 3.74674151654024E-002, 2.56721177985165E-002, 1.80978376125312E-002, 1.27651414467762E-002, 9.00191143584345E-003, 6.35914844550409E-003, 4.74758342849278E-003, 3.70666941475907E-003, 2.90019740820061E-003, 2.27261370675392E-003, 1.77730046297422E-003, 1.39186180835330E-003, 1.09157036308653E-003}; const float buehlmann_N2_a[] = { 1.1696f, 1.0000f, 0.8618f, 0.7562f, 0.6200f, 0.5043f, 0.4410f, 0.4000f, 0.3750f, 0.3500f, 0.3295f, 0.3065f, 0.2835f, 0.2610f, 0.2480f, 0.2327f}; const float buehlmann_N2_b[] = { 0.5578f, 0.6514f, 0.7222f, 0.7825f, 0.8126f, 0.8434f, 0.8693f, 0.8910f, 0.9092f, 0.9222f, 0.9319f, 0.9403f, 0.9477f, 0.9544f, 0.9602f, 0.9653f}; const float buehlmann_He_a[] = { 1.6189f, 1.3830f, 1.1919f, 1.0458f, 0.9220f, 0.8205f, 0.7305f, 0.6502f, 0.5950f, 0.5545f, 0.5333f, 0.5189f, 0.5181f, 0.5176f, 0.5172f, 0.5119f}; const float buehlmann_He_b[] = { 0.4770f, 0.5747f, 0.6527f, 0.7223f, 0.7582f, 0.7957f, 0.8279f, 0.8553f, 0.8757f, 0.8903f, 0.8997f, 0.9073f, 0.9122f, 0.9171f, 0.9217f, 0.9267f}; const float buehlmann_N2_t_halflife[] = { 5.0f, 8.0f, 12.5f, 18.5f, 27.0f, 38.3f, 54.3f, 77.0f, 109.0f, 146.0f, 187.0f, 239.0f, 305.0f, 390.0f, 498.0f, 635.0f}; const float buehlmann_He_t_halflife[] = { 1.88f, 3.02f, 4.72f, 6.99f, 10.21f, 14.48f, 20.53f, 29.11f, 41.20f, 55.19f, 70.69f, 90.34f, 115.29f, 147.42f, 188.24f, 240.03f}; const float float_buehlmann_N2_factor_expositon_one_second[] = { 2.30782347297664E-003f, 1.44301447809736E-003f, 9.23769302935806E-004f, 6.24261986779007E-004f, 4.27777107246730E-004f, 3.01585140931371E-004f, 2.12729727268379E-004f, 1.50020603047807E-004f, 1.05980191127841E-004f, 7.91232600646508E-005f, 6.17759153688224E-005f, 4.83354552742732E-005f, 3.78761777920511E-005f, 2.96212356654113E-005f, 2.31974277413727E-005f, 1.81926738960225E-005f}; const float float_buehlmann_N2_factor_expositon_003_second[] = { 6.90750456296407E-003f, 4.32279956671600E-003f, 2.76874864793053E-003f, 1.87161709452954E-003f, 1.28278242026003E-003f, 9.04482589432765E-004f, 6.38053429621421E-004f, 4.49994293975742E-004f, 3.17906879170993E-004f, 2.37350999218289E-004f, 1.85316297551252E-004f, 1.44999356986975E-004f, 1.13624229615916E-004f, 8.88610747694640E-005f, 6.95906688746861E-005f, 5.45770287740943E-005f}; const float float_buehlmann_N2_factor_expositon_008_second[] = { 1.83141447532454E-002f, 1.14859796471039E-002f, 7.36630472495203E-003f, 4.98319782231915E-003f, 3.41709742823104E-003f, 2.41013596224415E-003f, 1.70057124687550E-003f, 1.19953484034729E-003f, 8.47527105247492E-004f, 6.32810814525819E-004f, 4.94100480767923E-004f, 3.86618231662861E-004f, 3.02969256443353E-004f, 2.36945319086024E-004f, 1.85564355251966E-004f, 1.45532124251058E-004f}; const float float_buehlmann_N2_factor_expositon_10_seconds[] = { 2.28400315657541E-002f, 1.43368013598124E-002f, 9.19938673477072E-003f, 6.22511239287027E-003f, 4.69545762670800E-003f, 3.01176178733265E-003f, 2.12526200031782E-003f, 1.49919365737827E-003f, 1.05929662305226E-03f, 7.909509380171760E-004f, 6.17587450108648E-004f, 4.83249432061905E-004f, 3.78697227222391E-004f, 2.61728759809380E-004f, 2.31950063482533E-004f, 1.81911845881011E-004f}; const float float_buehlmann_N2_factor_expositon_18_seconds[] = { 4.07358806747357E-002f, 2.56581087982929E-002f, 1.64979259737517E-002f, 1.11772892486697E-002f, 7.67205373705648E-003f, 5.41463899418337E-003f, 3.82221908774349E-003f, 2.69693016270112E-003f, 1.90592594569927E-003f, 1.42326123023573E-003f, 1.11138278062062E-003f, 8.69680830683950E-004f, 6.81551750048359E-004f, 5.33048018290350E-004f, 4.17471377070378E-004f, 3.27417496114757E-004f}; const float float_buehlmann_N2_factor_expositon_20_seconds[] = { 4.51583960895835E-002f, 2.84680588463941E-002f, 1.83141447532454E-002f, 1.24114727614367E-002f, 8.52086250432193E-003f, 6.01445286560154E-003f, 4.24600726206570E-003f, 2.99613973313428E-003f, 2.11747113676897E-003f, 1.58127627264804E-003f, 1.23479348595879E-003f, 9.66265334110261E-004f, 7.57251042854845E-004f, 5.92258033589421E-004f, 4.63846326133055E-004f, 3.63790599842373E-004f}; const float float_buehlmann_N2_factor_expositon_one_minute[] = { 1.29449436703876E-001f, 8.29959567953288E-002f, 5.39423532744041E-002f, 3.67741962370398E-002f, 2.53453908775689E-002f, 1.79350552316596E-002f, 1.26840126026602E-002f, 8.96151553540825E-003f, 6.33897185233323E-003f, 4.73633146787078E-003f, 3.69980819572546E-003f, 2.89599589841472E-003f, 2.27003327536857E-003f, 1.77572199977927E-003f, 1.39089361795441E-003f, 1.09097481687104E-003f}; const float float_buehlmann_N2_factor_expositon_100_second[] = { 2.06299474015900E-001f, 1.34463438993857E-001f, 8.82775114417832E-002f, 6.05359181023788E-002f, 4.18844218114071E-002f, 2.97126970072147E-002f, 2.10505144045823E-002f, 1.48911986890571E-002f, 1.05426136839346E-002f, 7.88141652426455E-003f, 6.15873909572406E-003f, 4.82199900095137E-003f, 3.78052526350936E-003f, 2.95778454900952E-003f, 2.31708109427220E-003f, 1.81763004457269E-003f}; const float float_buehlmann_N2_factor_expositon_five_minutes[]= { 5.00000000000000E-001f, 3.51580222674495E-001f, 2.42141716744801E-001f, 1.70835801932547E-001f, 1.20463829104624E-001f, 8.65157896183918E-002f, 6.18314987350977E-002f, 4.40116547625051E-002f, 3.12955727186929E-002f, 2.34583889613009E-002f, 1.83626606868127E-002f, 1.43963540993090E-002f, 1.12987527093947E-002f, 8.84713405486026E-003f, 6.93514912851934E-003f, 5.44298480182925E-003f}; const float float_buehlmann_N2_factor_expositon_800_second[] = { 8.42509868763141E-001f, 6.85019737526282E-001f, 5.22579198044792E-001f, 3.93205767018569E-001f, 2.89861248917861E-001f, 2.14397627137602E-001f, 1.56505490290652E-001f, 1.13102166881646E-001f, 8.12935637814599E-002f, 6.13392112527207E-002f, 4.82208523469105E-002f, 3.79311861210304E-002f, 2.98470272862601E-002f, 2.34187624071612E-002f, 1.83870151711824E-002f, 1.44488700649190E-002f}; const float float_buehlmann_N2_factor_expositon_one_hour[]= { 9.99755859375000E-001f, 9.94475728271980E-001f, 9.64103176406343E-001f, 8.94394508891055E-001f, 7.85689004286732E-001f, 6.62392147498621E-001f, 5.35088626789486E-001f, 4.17318576947576E-001f, 3.17197008420226E-001f, 2.47876700002107E-001f, 1.99405069752929E-001f, 1.59713055172538E-001f, 1.27468761759271E-001f, 1.01149026804458E-001f, 8.01196838116008E-002f, 6.33955413542552E-002f}; const float float_buehlmann_He_factor_expositon_one_second[] = { 6.12608039419837E-003f, 3.81800836683133E-003f, 2.44456078654209E-003f, 1.65134647076792E-003f, 1.13084424730725E-003f, 7.97503165599123E-004f, 5.62552521860549E-004f, 3.96776399429366E-004f, 2.80360036664540E-004f, 2.09299583354805E-004f, 1.63410794820518E-004f, 1.27869320250551E-004f, 1.00198406028040E-004f, 7.83611475491108E-005f, 6.13689891868496E-005f, 4.81280465299827E-005f}; const float float_buehlmann_He_factor_expositon_003_second[] = { 1.82658845044263E-002f, 1.14103491926518E-002f, 7.31576933570466E-003f, 4.94586307993539E-003f, 3.38869776192019E-003f, 2.39060197012086E-003f, 1.68670834759044E-003f, 1.18985696621965E-003f, 8.40844326779777E-004f, 6.27767340286467E-004f, 4.90152279561396E-004f, 3.83558911153159E-004f, 3.00565099928485E-004f, 2.35065021719993E-004f, 1.84095669333084E-004f, 1.44377190774980E-004f}; // 3 He const float float_buehlmann_He_factor_expositon_008_second[] = { 4.79706116082057E-002f, 3.01390075707096E-002f, 1.93899772993034E-002f, 1.31346689569831E-002f, 9.01102820363486E-003f, 6.36224538449637E-003f, 4.49156910795023E-003f, 3.16980660943422E-003f, 2.24068067793926E-003f, 1.67317060331207E-003f, 1.30653891641375E-003f, 1.02249686330114E-003f, 8.01306192375617E-004f, 6.26717274191169E-004f, 4.90846474157092E-004f, 3.84959521834594E-004f}; // 8 He const float float_buehlmann_He_factor_expositon_10_seconds[] = { 5.95993001714799E-002f, 3.75307444923134E-002f, 2.41784389107607E-002f, 1.63912909924208E-002f, 1.25106927410620E-002f, 7.94647192918641E-003f, 5.61130562069978E-003f, 3.96068706690245E-003f, 2.80006593100546E-003f, 2.09102564918129E-003f, 1.63290683272987E-003f, 1.27795767799976E-003f, 1.00153239354972E-003f, 7.33352120986130E-004f, 6.13520442722559E-004f, 4.81176244777948E-004f}; const float float_buehlmann_He_factor_expositon_18_seconds[] = { 1.04710896899039E-001f, 6.65386126706349E-002f, 4.30995968284519E-002f, 2.93106657684409E-002f, 2.01607137751910E-002f, 1.42581599093282E-002f, 1.00776711616688E-002f, 7.11793906429403E-003f, 5.03447255531631E-003f, 3.76069760984632E-003f, 2.93731229281968E-003f, 2.29914783358365E-003f, 1.80203605181650E-003f, 1.40956155658090E-003f, 1.10406577253352E-003f, 8.65950533235460E-004f}; const float float_buehlmann_He_factor_expositon_20_seconds[] = { 1.15646523762030E-001f, 7.36529322024796E-002f, 4.77722809133601E-002f, 3.25139075644434E-002f, 2.23755519884017E-002f, 1.58297974422514E-002f, 1.11911244906306E-002f, 7.90568709176287E-003f, 5.59229149279306E-003f, 4.17767891009702E-003f, 3.26314728073529E-003f, 2.55428218017273E-003f, 2.00206171996409E-003f, 1.56605681014277E-003f, 1.22666447811148E-003f, 9.62120958977297E-004f}; const float float_buehlmann_He_factor_expositon_one_minute[] = { 3.08363886219441E-001f, 2.05084082411030E-001f, 1.36579295730211E-001f, 9.44046323514587E-002f, 6.56358626478964E-002f, 4.67416115355790E-002f, 3.31990512604121E-002f, 2.35300557146709E-002f, 1.66832281977395E-002f, 1.24807506400979E-002f, 9.75753219809561E-003f, 7.64329013320042E-003f, 5.99416843126677E-003f, 4.69081666943783E-003f, 3.67548116287808E-003f, 2.88358673732592E-003f}; const float float_buehlmann_He_factor_expositon_100_second[] = { 4.59084487437744E-001f, 3.17867635141657E-001f, 2.17103957783539E-001f, 1.52336166567559E-001f, 1.06981885584572E-001f, 7.66825160768219E-002f, 5.47171474343117E-002f, 3.89083581201959E-002f, 2.76504642556165E-002f, 2.07145921483078E-002f, 1.62096019995457E-002f, 1.27063337640768E-002f, 9.97030625587825E-003f, 7.80579708939710E-003f, 6.11829377951190E-003f, 4.80135692933603E-003f}; // 100 He const float float_buehlmann_He_factor_expositon_five_minutes[]= { 8.41733751018722E-001f, 6.82600697933713E-001f, 5.20142493735619E-001f, 3.90924736715930E-001f, 2.87834706153524E-001f, 2.12857832580192E-001f, 1.55333364924147E-001f, 1.12242395185686E-001f, 8.06788883581406E-002f, 6.08653819753062E-002f, 4.78448115000141E-002f, 3.76366999883051E-002f, 2.96136888654287E-002f, 2.32350754744602E-002f, 1.82428098114835E-002f, 1.43350223887367E-002f}; // thre const float float_buehlmann_He_factor_expositon_800_second[] = { 9.92671155759686E-001f, 9.53124140216102E-001f, 8.58865632718416E-001f, 7.33443528431762E-001f, 5.95533881446524E-001f, 4.71787742036413E-001f, 3.62479376011699E-001f, 2.72021750877104E-001f, 2.00940186773410E-001f, 1.54187175639359E-001f, 1.22553521140786E-001f, 9.72431193565182E-002f, 7.70338702477497E-002f, 6.07666995543268E-002f, 4.79109397391700E-002f, 3.77715319879068E-002f}; // 800 He const float float_buehlmann_He_factor_expositon_one_hour[]= { 9.99999999753021E-001f, 9.99998954626205E-001f, 9.99850944669188E-001f, 9.97393537149572E-001f, 9.82979603888650E-001f, 9.43423231328217E-001f, 8.68106292901111E-001f, 7.60374619482322E-001f, 6.35576141220644E-001f, 5.29310840978539E-001f, 4.44744511849213E-001f, 3.68942936079581E-001f, 3.02834419265355E-001f, 2.45810174422126E-001f, 1.98231319020275E-001f, 1.59085372294989E-001f}; void decom_get_inert_gases(const float ambient_pressure_bar,const SGas* pGas, float* fraction_nitrogen, float* fraction_helium ) { float fraction_all_inertgases; float ppo2_fraction_setpoint; float diluent_divisor; *fraction_nitrogen = ((float)pGas->nitrogen_percentage) / 100.0f; *fraction_helium = ((float)pGas->helium_percentage) / 100.0f; if(pGas->AppliedDiveMode == DIVEMODE_CCR) { // continue with CCR fraction_all_inertgases = *fraction_nitrogen + *fraction_helium; ppo2_fraction_setpoint = (float)pGas->setPoint_cbar/ (100 * ambient_pressure_bar); diluent_divisor = (1.0f - ppo2_fraction_setpoint) / fraction_all_inertgases; if(diluent_divisor < 0) diluent_divisor = 0; *fraction_nitrogen *= diluent_divisor; *fraction_helium *= diluent_divisor; } if(pGas->AppliedDiveMode == DIVEMODE_PSCR) { fraction_all_inertgases = *fraction_nitrogen + *fraction_helium; ppo2_fraction_setpoint = decom_calc_SimppO2(ambient_pressure_bar, pGas) / ambient_pressure_bar; diluent_divisor = (1.0f - ppo2_fraction_setpoint) / fraction_all_inertgases; if(diluent_divisor < 0) diluent_divisor = 0; *fraction_nitrogen *= diluent_divisor; *fraction_helium *= diluent_divisor; } } void decom_tissues_exposure(int period_in_seconds, SLifeData * pLifeData) { decom_tissues_exposure2(period_in_seconds, &pLifeData->actualGas, pLifeData->pressure_ambient_bar, pLifeData->tissue_nitrogen_bar, pLifeData->tissue_helium_bar); } void decom_tissues_exposure2(int period_in_seconds, SGas* pActualGas, float ambiant_pressure_bar, float *tissue_N2_selected_stage, float *tissue_He_selected_stage) { int ci; float percent_N2; float percent_He; float partial_pressure_N2; float partial_pressure_He; int period_in_seconds_left; if(period_in_seconds > 0) { decom_get_inert_gases(ambiant_pressure_bar, pActualGas, &percent_N2, &percent_He); partial_pressure_N2 = (ambiant_pressure_bar - WATER_VAPOUR_PRESSURE) * percent_N2; partial_pressure_He = (ambiant_pressure_bar - WATER_VAPOUR_PRESSURE) * percent_He; period_in_seconds_left = period_in_seconds; while(period_in_seconds_left) { if(period_in_seconds_left >= 3600) period_in_seconds = 3600; else if(period_in_seconds_left >= 800) period_in_seconds = 800; else if(period_in_seconds_left >= 300) period_in_seconds = 300; else if(period_in_seconds_left >= 100) period_in_seconds = 100; else if(period_in_seconds_left >= 60) period_in_seconds = 60; else if(period_in_seconds_left == 36) period_in_seconds = 18; else if(period_in_seconds_left >= 20) period_in_seconds = 20; else if(period_in_seconds_left >= 18) period_in_seconds = 18; else if(period_in_seconds_left >= 10) period_in_seconds = 10; else if(period_in_seconds_left >= 8) period_in_seconds = 8; else if(period_in_seconds_left >= 3) period_in_seconds = 3; else period_in_seconds = 1; period_in_seconds_left -= period_in_seconds; switch (period_in_seconds) { case 1: for (ci=0;ci<16;ci++) { tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_one_second[ci]; tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_one_second[ci]; } break; case 3: for (ci=0;ci<16;ci++) { tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_003_second[ci]; tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_003_second[ci]; } break; case 8: for (ci=0;ci<16;ci++) { tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_008_second[ci]; tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_008_second[ci]; } break; case 10: for (ci=0;ci<16;ci++) { tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_10_seconds[ci]; tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_10_seconds[ci]; } break; case 18: for (ci=0;ci<16;ci++) { tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_18_seconds[ci]; tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_18_seconds[ci]; } break; case 20: for (ci=0;ci<16;ci++) { tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_20_seconds[ci]; tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_20_seconds[ci]; } break; case 60: for (ci=0;ci<16;ci++) { tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_one_minute[ci]; tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_one_minute[ci]; } break; case 100: for (ci=0;ci<16;ci++) { tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_100_second[ci]; tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_100_second[ci]; } break; case 300: for (ci=0;ci<16;ci++) { tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_five_minutes[ci]; tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_five_minutes[ci]; } break; case 800: for (ci=0;ci<16;ci++) { tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_800_second[ci]; tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_800_second[ci]; } break; case 3600: for (ci=0;ci<16;ci++) { tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_one_hour[ci]; tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_one_hour[ci]; } break; } } } } void decom_reset_with_1000mbar(SLifeData * pLifeData) { double saturation = 1.0; saturation -= WATER_VAPOUR_PRESSURE; saturation *= FRACTION_N2_AIR; for(int i=0;i<16;i++) { pLifeData->tissue_nitrogen_bar[i] = saturation; pLifeData->tissue_helium_bar[i] = 0; } pLifeData->otu = 0; pLifeData->cns = 0; pLifeData->desaturation_time_minutes = 0; pLifeData->no_fly_time_minutes = 0; } void decom_reset_with_ambientmbar(float ambient, SLifeData * pLifeData) { float saturation = 1.0; saturation = ambient; saturation -= WATER_VAPOUR_PRESSURE; saturation *= FRACTION_N2_AIR; for(int i=0;i<16;i++) { pLifeData->tissue_nitrogen_bar[i] = saturation; pLifeData->tissue_helium_bar[i] = 0; } pLifeData->otu = 0; pLifeData->cns = 0; pLifeData->desaturation_time_minutes = 0; pLifeData->no_fly_time_minutes = 0; } /* =============================================================================== */ /* NOTE ABOUT PRESSURE UNITS USED IN CALCULATIONS: */ /* It is the convention in decompression calculations to compute all gas */ /* loadings, absolute pressures, partial pressures, etc., in the units of */ /* depth pressure that you are diving - either feet of seawater (fsw) or */ /* meters of seawater (msw). This program follows that convention with the */ /* the exception that all VPM calculations are performed in SI units (by */ /* necessity). Accordingly, there are several conversions back and forth */ /* between the diving pressure units and the SI units. */ /* =============================================================================== */ /* =============================================================================== */ /* FUNCTION SUBPROGRAM FOR GAS LOADING CALCULATIONS - ASCENT AND DESCENT */ /* =============================================================================== */ float decom_schreiner_equation(float *initial_inspired_gas_pressure, float *rate_change_insp_gas_pressure, float *interval_time_minutes, const float *gas_time_constant, float *initial_gas_pressure) { /* System generated locals */ float ret_val; float time_null_pressure = 0.0f; float time_rest = 0.0f; float time = *interval_time_minutes; /* =============================================================================== */ /* Note: The Schreiner equation is applied when calculating the uptake or */ /* elimination of compartment gases during linear ascents or descents at a */ /* constant rate. For ascents, a negative number for rate must be used. */ /* =============================================================================== */ if( *rate_change_insp_gas_pressure < 0.0f) { time_null_pressure = -1.0f * *initial_inspired_gas_pressure / *rate_change_insp_gas_pressure; if(time > time_null_pressure ) { time_rest = time - time_null_pressure; time = time_null_pressure; } } ret_val = *initial_inspired_gas_pressure + *rate_change_insp_gas_pressure * (time - 1.f / *gas_time_constant) - (*initial_inspired_gas_pressure - *initial_gas_pressure - *rate_change_insp_gas_pressure / *gas_time_constant) * expf(-(*gas_time_constant) * time); if(time_rest > 0.0f) { ret_val = ret_val * expf(-(*gas_time_constant) * time_rest); } return ret_val; }; /* schreiner_equation__2 */ void decom_tissues_exposure_stage_schreiner(int period_in_seconds, SGas* pGas, float starting_ambient_pressure_bar, float ending_ambient_pressure_bar, float* pTissue_nitrogen_bar, float* pTissue_helium_bar) { float initial_pressure_N2; float initial_pressure_He; float ending_pressure_N2; float ending_pressure_He; float fraction_N2_begin; float fraction_N2_end; float fraction_He_begin; float fraction_He_end; float rate_N2; float rate_He; float period_in_minutes; int ci; if(period_in_seconds <= 0) return; decom_get_inert_gases(starting_ambient_pressure_bar, pGas, &fraction_N2_begin, &fraction_He_begin ); decom_get_inert_gases(ending_ambient_pressure_bar, pGas, &fraction_N2_end, &fraction_He_end ); initial_pressure_N2 = (starting_ambient_pressure_bar - WATER_VAPOUR_PRESSURE) * fraction_N2_begin; initial_pressure_He = (starting_ambient_pressure_bar - WATER_VAPOUR_PRESSURE) * fraction_He_begin; ending_pressure_N2 = (ending_ambient_pressure_bar - WATER_VAPOUR_PRESSURE) * fraction_N2_end; ending_pressure_He = (ending_ambient_pressure_bar - WATER_VAPOUR_PRESSURE) * fraction_He_end; rate_N2 = (ending_pressure_N2 - initial_pressure_N2) / period_in_seconds; rate_He = (ending_pressure_He - initial_pressure_He) / period_in_seconds; period_in_minutes = ((float)period_in_seconds) / 60.0f; for (ci=0;ci<16;ci++) { pTissue_nitrogen_bar[ci] = decom_schreiner_equation( &initial_pressure_N2, &rate_N2, &period_in_minutes, &nitrogen_time_constant[ci], &pTissue_nitrogen_bar[ci]); pTissue_helium_bar[ci] = decom_schreiner_equation( &initial_pressure_He, &rate_He, &period_in_minutes, &helium_time_constant[ci], &pTissue_helium_bar[ci]); } } _Bool nextSetpointChange(SDiveSettings* pDiveSettings, uint8_t depth_meter, uint8_t* change_depth_meter, char* setpoint) { uint8_t new_depth = 0; char new_setpoint = 0; for(int i = 1; i <= 5; i++) { if(pDiveSettings->setpoint[i].setpoint_cbar > 0 && pDiveSettings->setpoint[i].depth_meter > 0 ) { if( pDiveSettings->setpoint[i].depth_meter > new_depth && pDiveSettings->setpoint[i].depth_meter < depth_meter) { new_depth = pDiveSettings->setpoint[i].depth_meter; new_setpoint = pDiveSettings->setpoint[i].setpoint_cbar; } } } if(new_depth) { * change_depth_meter = new_depth; * setpoint = new_setpoint; return 1; } return 0; } void decom_CreateGasChangeList(SDiveSettings* pInput, const SLifeData* pLifeData) { int i=0, j = 0; int count = 0; for(i=0;i< 5;i++) { //FirstGas pInput->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero = 0; pInput->decogaslist[i].GasIdInSettings = 255; pInput->decogaslist[i].setPoint_cbar = 0; pInput->decogaslist[i].helium_percentage = 0; pInput->decogaslist[i].nitrogen_percentage = 0; } //pInput->liveData.dive_time_seconds = 0; /* FirstGas * 0 = special gas, 1 to 5 ist OC gas, 6 to 10 is diluent */ pInput->decogaslist[0] = pLifeData->actualGas; /* Add Deco Gases * special (gasId == 0) is never a deco/travel gas but actual gas only */ if(pInput->diveMode == DIVEMODE_OC) { for(i=1;i<= 5;i++) { if(pInput->gas[i].note.ub.active && pInput->gas[i].depth_meter && (pLifeData->actualGas.GasIdInSettings != i) &&(pInput->gas[i].depth_meter < pLifeData->depth_meter ) ) { count = 1; for(j=1;j<= 5;j++) { if( (pInput->gas[j].note.ub.active && pInput->gas[j].depth_meter > 0) && (pLifeData->actualGas.GasIdInSettings != j) // new hw 160905 && (pInput->gas[j].depth_meter > pInput->gas[i].depth_meter)) count++; } pInput->decogaslist[count].change_during_ascent_depth_meter_otherwise_zero = pInput->gas[i].depth_meter; pInput->decogaslist[count].nitrogen_percentage = 100; pInput->decogaslist[count].nitrogen_percentage -= pInput->gas[i].oxygen_percentage; pInput->decogaslist[count].nitrogen_percentage -= pInput->gas[i].helium_percentage; pInput->decogaslist[count].helium_percentage = pInput->gas[i].helium_percentage; pInput->decogaslist[count].GasIdInSettings = i; pInput->decogaslist[count].AppliedDiveMode = DIVEMODE_OC; } } } else { //divmode CCR or PSCR for(i=6; i <= 10; i++) { if((pInput->gas[i].note.ub.active) && (pInput->gas[i].depth_meter) && (pLifeData->actualGas.GasIdInSettings != i) && (pInput->gas[i].depth_meter < pLifeData->depth_meter )) { count = 1; for(j=6;j<= 10;j++) { // if(pInput->gas[j].note.ub.active && pInput->gas[j].depth_meter > 0 &&pInput->gas[j].depth_meter > pInput->gas[i].depth_meter) if(((pInput->gas[j].note.ub.active) && (pInput->gas[j].depth_meter > 0)) && (pLifeData->actualGas.GasIdInSettings != j) // new hw 160905 && (pInput->gas[j].depth_meter > pInput->gas[i].depth_meter)) count++; } pInput->decogaslist[count].change_during_ascent_depth_meter_otherwise_zero = pInput->gas[i].depth_meter; pInput->decogaslist[count].nitrogen_percentage = 100; if(pInput->diveMode == DIVEMODE_PSCR) { pInput->decogaslist[count].AppliedDiveMode = DIVEMODE_PSCR; pInput->decogaslist[count].setPoint_cbar = decom_calc_SimppO2_O2based((float)(pInput->gas[i].depth_meter / 10.0 + 1.0), pInput->gas[i].oxygen_percentage, pInput->decogaslist[count].pscr_factor ) * 100; pInput->decogaslist[count].nitrogen_percentage -= pInput->gas[i].oxygen_percentage; } else { pInput->decogaslist[count].nitrogen_percentage -= pInput->gas[i].oxygen_percentage; pInput->decogaslist[count].AppliedDiveMode = DIVEMODE_CCR; pInput->decogaslist[count].setPoint_cbar = pInput->decogaslist[0].setPoint_cbar; /* assume that current setpoint is kept till end of the dive */ } pInput->decogaslist[count].nitrogen_percentage -= pInput->gas[i].helium_percentage; pInput->decogaslist[count].helium_percentage = pInput->gas[i].helium_percentage; pInput->decogaslist[count].GasIdInSettings = i; } } } } void test_decom_CreateGasChangeList(void) { SDiveSettings diveSetting; SLifeData lifeData; lifeData.depth_meter = 100; lifeData.actualGas.helium_percentage = 30; lifeData.actualGas.nitrogen_percentage = 60; lifeData.actualGas.setPoint_cbar = 18; lifeData.actualGas.GasIdInSettings = 0; lifeData.actualGas.change_during_ascent_depth_meter_otherwise_zero = 0; diveSetting.diveMode = DIVEMODE_CCR; diveSetting.gas[6].depth_meter = 0; diveSetting.gas[6].helium_percentage = 30; diveSetting.gas[6].oxygen_percentage = 10; diveSetting.gas[6].note.ub.active = 1; diveSetting.gas[7].depth_meter = 60; diveSetting.gas[7].helium_percentage = 0; diveSetting.gas[7].oxygen_percentage = 10; diveSetting.gas[7].note.ub.active = 1; diveSetting.gas[8].note.ub.active = 0; diveSetting.gas[9].note.ub.active = 0; diveSetting.gas[10].note.ub.active = 0; diveSetting.setpoint[0].depth_meter = 0; diveSetting.setpoint[1].depth_meter = 80; diveSetting.setpoint[1].setpoint_cbar = 20; diveSetting.setpoint[2].depth_meter = 60; diveSetting.setpoint[2].setpoint_cbar = 25; diveSetting.setpoint[3].depth_meter = 0; diveSetting.setpoint[4].depth_meter = 0; diveSetting.setpoint[5].depth_meter = 0; decom_CreateGasChangeList(&diveSetting, &lifeData); } uint8_t decom_tissue_test_tolerance(float* Tissue_nitrogen_bar, float* Tissue_helium_bar, float GF_value, float depth_in_bar_absolute) { float tissue_inertgas_saturation; float inertgas_a; float inertgas_b; float inertgas_tolerance; float gf_minus_1; gf_minus_1 = GF_value - 1.0f; for (int ci = 0; ci < 16; ci++) { if(Tissue_helium_bar[ci] == 0) { tissue_inertgas_saturation = Tissue_nitrogen_bar[ci]; // inertgas_a = buehlmann_N2_a[ci]; inertgas_b = buehlmann_N2_b[ci]; } else { tissue_inertgas_saturation = Tissue_nitrogen_bar[ci] + Tissue_helium_bar[ci]; // inertgas_a = ( ( buehlmann_N2_a[ci] * Tissue_nitrogen_bar[ci]) + ( buehlmann_He_a[ci] * Tissue_helium_bar[ci]) ) / tissue_inertgas_saturation; inertgas_b = ( ( buehlmann_N2_b[ci] * Tissue_nitrogen_bar[ci]) + ( buehlmann_He_b[ci] * Tissue_helium_bar[ci]) ) / tissue_inertgas_saturation; } // inertgas_tolerance = ( (GF_value / inertgas_b - gf_minus_1) * depth_in_bar_absolute ) + ( GF_value * inertgas_a ); // if(inertgas_tolerance < tissue_inertgas_saturation) return 0; } return 1; } void decom_tissues_desaturation_time(const SLifeData* pLifeData, SLifeData2* pOutput) { float pressure_in_gas_for_complete; float pressure_in_gas_for_desat; float diff_to_complete; float diff_to_desatpoint; float necessary_halftimes; float desattime; pressure_in_gas_for_complete = 0.7902f * ( pLifeData->pressure_surface_bar - 0.0627f); pressure_in_gas_for_desat = 1.05f * pressure_in_gas_for_complete; for(int i=0; i<16; i++) { diff_to_complete = pressure_in_gas_for_complete - pLifeData->tissue_nitrogen_bar[i]; diff_to_desatpoint = pressure_in_gas_for_desat - pLifeData->tissue_nitrogen_bar[i]; if((diff_to_desatpoint >= 0) || (diff_to_complete >= 0)) pOutput->tissue_nitrogen_desaturation_time_minutes[i] = 0; else { necessary_halftimes = (logf(1.0f - (diff_to_desatpoint/diff_to_complete)) / -0.6931f); desattime = buehlmann_N2_t_halflife[i] * necessary_halftimes; if(desattime <= (float)0xFFFF) pOutput->tissue_nitrogen_desaturation_time_minutes[i] = desattime; else pOutput->tissue_nitrogen_desaturation_time_minutes[i] = 0xFFFF; } } for(int i=0; i<16; i++) { diff_to_desatpoint = 0.05f - pLifeData->tissue_helium_bar[i]; diff_to_complete = -1.0f * pLifeData->tissue_helium_bar[i]; if((diff_to_desatpoint >= 0) || (diff_to_complete >= 0)) pOutput->tissue_helium_desaturation_time_minutes[i] = 0; else { necessary_halftimes = (logf(1.0f - (diff_to_desatpoint/diff_to_complete)) / -0.6931f); desattime = buehlmann_He_t_halflife[i] * necessary_halftimes; if(desattime <= (float)0xFFFF) pOutput->tissue_helium_desaturation_time_minutes[i] = desattime; else pOutput->tissue_helium_desaturation_time_minutes[i] = 0xFFFF; } } } #define MAX_DEGRADE_OTU_TIME_MINUTES (1440) //CNS&OTU: #define OXY_TEN_MINUTES_IN_SECONDS (600) #define OXY_HALF_LIVE_OF_TEN_MINUTES__INVERSE_NINTH_ROOT_OF_TWO (0.92587471f) #define OXY_NINE_DAYS_IN_TEN_MINUTES (1296) #define OXY_ONE_SIXTIETH_PART (0.0166667f) #define OXY_NEGATIVE_FIVE_SIXTH_PARTS (-0.8333333f) void decom_oxygen_calculate_otu(float* oxygen_otu, float pressure_oxygen_real) { if(pressure_oxygen_real <= 0.5f) return; *oxygen_otu += (pow((double)(0.5f / (pressure_oxygen_real - 0.5f)),OXY_NEGATIVE_FIVE_SIXTH_PARTS)) * OXY_ONE_SIXTIETH_PART; } void decom_oxygen_calculate_otu_degrade(float* oxygen_otu, long seconds_since_last_dive) { static long otu_time_ticker = 0; static double otu_degrade_every_10_minutes = 999.9; long cycles_since_last_call; if((*oxygen_otu <= 0) || (seconds_since_last_dive == 0)) *oxygen_otu = 0; else if(seconds_since_last_dive < OXY_TEN_MINUTES_IN_SECONDS) { otu_time_ticker = 1; otu_degrade_every_10_minutes = *oxygen_otu / (MAX_DEGRADE_OTU_TIME_MINUTES / 10); } else { cycles_since_last_call = seconds_since_last_dive / (otu_time_ticker * OXY_TEN_MINUTES_IN_SECONDS); *oxygen_otu -= ((double)cycles_since_last_call) * otu_degrade_every_10_minutes; otu_time_ticker += cycles_since_last_call; if((*oxygen_otu < 0) || (otu_time_ticker > (MAX_DEGRADE_OTU_TIME_MINUTES / 10))) *oxygen_otu = 0; } } void decom_oxygen_calculate_cns_degrade(float* oxygen_cns, long seconds_since_last_dive) { static long cns_time_ticker = 0; int cns_max_cycles; if((*oxygen_cns <= 0.5f) || (seconds_since_last_dive == 0)) *oxygen_cns = 0; else if(seconds_since_last_dive < OXY_TEN_MINUTES_IN_SECONDS) cns_time_ticker = 1; else { cns_max_cycles = OXY_NINE_DAYS_IN_TEN_MINUTES; while((*oxygen_cns >= 0.5f) && ((cns_time_ticker * OXY_TEN_MINUTES_IN_SECONDS) < seconds_since_last_dive) && cns_max_cycles) { cns_time_ticker++; cns_max_cycles--; *oxygen_cns *= OXY_HALF_LIVE_OF_TEN_MINUTES__INVERSE_NINTH_ROOT_OF_TWO; } } } // new hwOS style void decom_oxygen_calculate_cns(float* oxygen_cns, float pressure_oxygen_real) { uint8_t char_I_actual_ppO2; float CNS_fraction = 0; const float time_factor = 3000.0f; if(pressure_oxygen_real < 0.15f) char_I_actual_ppO2 = 15; else if(pressure_oxygen_real >= 2.5f) char_I_actual_ppO2 = 255; else char_I_actual_ppO2 = (uint8_t)(pressure_oxygen_real * 100); if (char_I_actual_ppO2 < 50) (void)0; // no changes //------------------------------------------------------------------------ // Below (and including) 1.60 bar else if (char_I_actual_ppO2 < 61) CNS_fraction += time_factor/(-533.07f * char_I_actual_ppO2 + 54000.0f); else if (char_I_actual_ppO2 < 71) CNS_fraction += time_factor/(-444.22f * char_I_actual_ppO2 + 48600.0f); else if (char_I_actual_ppO2 < 81) CNS_fraction += time_factor/(-355.38f * char_I_actual_ppO2 + 42300.0f); else if (char_I_actual_ppO2 < 91) CNS_fraction += time_factor/(-266.53f * char_I_actual_ppO2 + 35100.0f); else if (char_I_actual_ppO2 < 111) CNS_fraction += time_factor/(-177.69f * char_I_actual_ppO2 + 27000.0f); else if (char_I_actual_ppO2 < 152) CNS_fraction += time_factor/( -88.84f * char_I_actual_ppO2 + 17100.0f); else if (char_I_actual_ppO2 < 167) CNS_fraction += time_factor/(-222.11f * char_I_actual_ppO2 + 37350.0f); //------------------------------------------------------------------------ // Arieli et all.(2002): Modeling pulmonary and CNS O2 toxicity: // J Appl Physiol 92: 248--256, 2002, doi:10.1152/japplphysiol.00434.2001 // Formula (A1) based on value for 1.55 and c=20 // example calculation: Sqrt((1.7/1.55)^20)*0.000404 else if (char_I_actual_ppO2 < 172) CNS_fraction += time_factor*0.00102f; else if (char_I_actual_ppO2 < 177) CNS_fraction += time_factor*0.00136f; else if (char_I_actual_ppO2 < 182) CNS_fraction += time_factor*0.00180f; else if (char_I_actual_ppO2 < 187) CNS_fraction += time_factor*0.00237f; else if (char_I_actual_ppO2 < 192) CNS_fraction += time_factor*0.00310f; else if (char_I_actual_ppO2 < 198) CNS_fraction += time_factor*0.00401f; else if (char_I_actual_ppO2 < 203) CNS_fraction += time_factor*0.00517f; else if (char_I_actual_ppO2 < 233) CNS_fraction += time_factor*0.0209f; else CNS_fraction += time_factor*0.0482f; // value for 2.5 if( CNS_fraction > 999.0f) // Limit display to 999% CNS_fraction = 999.0f; if( CNS_fraction < 0.0f ) CNS_fraction = 0.0f; //calculate cns for the actual ppo2 for 1 second *oxygen_cns += OXY_ONE_SIXTIETH_PART * CNS_fraction; if( *oxygen_cns > 999.0f) // Limit display to 999% *oxygen_cns = 999.0f; if( *oxygen_cns < 0.0f ) *oxygen_cns = 0.0f; } /* old DR5 style void decom_oxygen_calculate_cns(float* oxygen_cns, float pressure_oxygen_real) { int cns_no_range = 0; _Bool not_found = 1; //for the cns calculation const float cns_ppo2_ranges[60][2] = { {0.50f, 0.00f}, {0.60f, 0.14f}, {0.64f, 0.15f}, {0.66f, 0.16f}, {0.68f, 0.17f}, {0.70f, 0.18f}, {0.74f, 0.19f}, {0.76f, 0.20f}, {0.78f, 0.21f}, {0.80f, 0.22f}, {0.82f, 0.23f}, {0.84f, 0.24f}, {0.86f, 0.25f}, {0.88f, 0.26f}, {0.90f, 0.28f}, {0.92f, 0.29f}, {0.94f, 0.30f}, {0.96f, 0.31f}, {0.98f, 0.32f}, {1.00f, 0.33f}, {1.02f, 0.35f}, {1.04f, 0.36f}, {1.06f, 0.38f}, {1.08f, 0.40f}, {1.10f, 0.42f}, {1.12f, 0.43f}, {1.14f, 0.43f}, {1.16f, 0.44f}, {1.18f, 0.46f}, {1.20f, 0.47f}, {1.22f, 0.48f}, {1.24f, 0.51f}, {1.26f, 0.52f}, {1.28f, 0.54f}, {1.30f, 0.56f}, {1.32f, 0.57f}, {1.34f, 0.60f}, {1.36f, 0.62f}, {1.38f, 0.63f}, {1.40f, 0.65f}, {1.42f, 0.68f}, {1.44f, 0.71f}, {1.46f, 0.74f}, {1.48f, 0.78f}, {1.50f, 0.83f}, {1.52f, 0.93f}, {1.54f, 1.04f}, {1.56f, 1.19f}, {1.58f, 1.47f}, {1.60f, 2.22f}, {1.62f, 5.00f}, {1.65f, 6.25f}, {1.67f, 7.69f}, {1.70f, 10.0f}, {1.72f,12.50f}, {1.74f,20.00f}, {1.77f,25.00f}, {1.79f,31.25f}, {1.80f,50.00f}, {1.82f,100.0f}}; //find the correct cns range for the corresponding ppo2 cns_no_range = 58; while (cns_no_range && not_found) { if (pressure_oxygen_real > cns_ppo2_ranges[cns_no_range][0]) { cns_no_range++; not_found = 0; } else cns_no_range--; } //calculate cns for the actual ppo2 for 1 second *oxygen_cns += OXY_ONE_SIXTIETH_PART * cns_ppo2_ranges[cns_no_range][1]; } */ void decom_oxygen_calculate_cns_exposure(int period_in_seconds, SGas* pActualGas, float pressure_ambient_bar, float* oxygen_cns) { float pressure_oxygen_real; float one_second_cns; pressure_oxygen_real = decom_calc_ppO2(pressure_ambient_bar, pActualGas); one_second_cns = 0; decom_oxygen_calculate_cns(&one_second_cns, pressure_oxygen_real); *oxygen_cns += one_second_cns * period_in_seconds; } void decom_oxygen_calculate_cns_stage_SchreinerStyle(int period_in_seconds, SGas* pGas, float starting_ambient_pressure_bar, float ending_ambient_pressure_bar, float* oxygen_cns) { if(ending_ambient_pressure_bar == starting_ambient_pressure_bar) { decom_oxygen_calculate_cns_exposure(period_in_seconds, pGas, starting_ambient_pressure_bar, oxygen_cns); return; } float pressure_oxygen_real; float initial_pressure_oxygen; float ending_pressure_oxygen; float rate_oxygen; initial_pressure_oxygen = decom_calc_ppO2(starting_ambient_pressure_bar, pGas); ending_pressure_oxygen = decom_calc_ppO2(ending_ambient_pressure_bar, pGas); rate_oxygen = (ending_pressure_oxygen - initial_pressure_oxygen) / period_in_seconds; pressure_oxygen_real = initial_pressure_oxygen; for(int i = 0; i < period_in_seconds; i++) { decom_oxygen_calculate_cns(oxygen_cns, pressure_oxygen_real); pressure_oxygen_real += rate_oxygen; } } float decom_calc_ppO2(const float ambiant_pressure_bar, const SGas* pGas) { float percent_N2 = 0; float percent_He = 0; float percent_O2 = 0; decom_get_inert_gases(ambiant_pressure_bar, pGas, &percent_N2, &percent_He); percent_O2 = 1 - percent_N2 - percent_He; return (ambiant_pressure_bar - WATER_VAPOUR_PRESSURE) * percent_O2; } float decom_calc_SimppO2(float ambiant_pressure_bar, const SGas* pGas) { float o2Ratio = 0.0; float inertGasRatio = 0.0; float simulatedPSCRppo2 = 0.0; o2Ratio = (100.0 - pGas->nitrogen_percentage - pGas->helium_percentage) / 100.0; inertGasRatio = 1.0 - o2Ratio; simulatedPSCRppo2 = (ambiant_pressure_bar - WATER_VAPOUR_PRESSURE) * o2Ratio; simulatedPSCRppo2 -= (inertGasRatio * pGas->pscr_factor); if(simulatedPSCRppo2 < 0.0) { simulatedPSCRppo2 = 0.0; } return simulatedPSCRppo2; } float decom_calc_SimppO2_O2based(float ambiant_pressure_bar, uint8_t O2PerCent, float factor) { float o2Ratio = 0.0; float inertGasRatio = 0.0; float simulatedPSCRppo2 = 0.0; o2Ratio = O2PerCent / 100.0; inertGasRatio = 1.0 - o2Ratio; simulatedPSCRppo2 = (ambiant_pressure_bar - WATER_VAPOUR_PRESSURE) * o2Ratio; simulatedPSCRppo2 -= (inertGasRatio * factor); if(simulatedPSCRppo2 < 0.0) { simulatedPSCRppo2 = 0.0; } return simulatedPSCRppo2; } uint8_t decom_get_actual_deco_stop(SDiveState* pDiveState) { SDecoinfo* pDecoinfo; uint8_t depthNext, depthLast, depthSecond, depthInc; if(pDiveState->diveSettings.deco_type.ub.standard == GF_MODE) pDecoinfo = &pDiveState->decolistBuehlmann; else pDecoinfo = &pDiveState->decolistVPM; depthLast = (uint8_t)(pDiveState->diveSettings.last_stop_depth_bar * 10); depthSecond = (uint8_t)(pDiveState->diveSettings.input_second_to_last_stop_depth_bar * 10); depthInc = (uint8_t)(pDiveState->diveSettings.input_next_stop_increment_depth_bar * 10); if(pDecoinfo->output_stop_length_seconds[0] > 0) { depthNext = depthLast; } else return 0; for(int i = DECOINFO_STRUCT_MAX_STOPS -1 ;i > 0; i--) { if(pDecoinfo->output_stop_length_seconds[i] > 0) { depthNext = depthSecond + ( (i - 1) * depthInc); break; } } return depthNext; } // =============================================================================== // decom_calc_desaturation_time /// @brief This code is used to calculate desat, calculated by RTE and send to Firmware /// similar but more technical in code than decom_tissues_desaturation_time() /// the later has 0.05 for helium in contrast to this one. /// This one goes down to 70%, the oterh /// /// output is desat time in minutes // =============================================================================== int decom_calc_desaturation_time(float* Tissue_nitrogen_bar, float* Tissue_helium_bar, float surface_pressure_bar) { const float N2_ratio = 0.7902; // FIXED sum as stated in b"uhlmann float pres_surface; float temp_atem; float float_desaturation_multiplier; float temp1,temp2,temp3,temp4; int ci; int int_temp; int int_O_desaturation_time; pres_surface = ((float)surface_pressure_bar); temp_atem = N2_ratio * (pres_surface - 0.0627f); int_O_desaturation_time = 0; float_desaturation_multiplier = 100 / 142.0f; // new in v.101 (70,42%/100.=142) for (ci=0;ci<16;ci++) { // saturation_time (for flight) and N2_saturation in multiples of halftime // version v.100: 1.1 = 10 percent distance to totally clean (totally clean is not possible, would take infinite time ) // new in version v.101: 1.07 = 7 percent distance to totally clean (totally clean is not possible, would take infinite time ) // changes in v.101: 1.05 = 5 percent dist to totally clean is new desaturation point for display and noFly calculations // N2 temp1 = 1.05f * temp_atem; temp1 = temp1 - (float)Tissue_nitrogen_bar[ci]; temp2 = temp_atem - (float)Tissue_nitrogen_bar[ci]; if (temp2 >= 0) { temp1 = 0; temp2 = 0; } else temp1 = temp1 / temp2; if (temp1 > 0) { temp1 = logf(1.0f - temp1); temp1 = temp1 / -0.6931f; // temp1 is the multiples of half times necessary. // 0.6931 is ln(2), because the math function log() calculates with a base of e not 2 as requested. // minus because log is negative temp2 = buehlmann_N2_t_halflife[ci] * temp1 / float_desaturation_multiplier; // time necessary (in minutes ) for complete desaturation (see comment about 10 percent) , new in v.101: float_desaturation_multiplier } else { temp1 = 0; temp2 = 0; } // He temp3 = 0.1f - (float)Tissue_helium_bar[ci]; if (temp3 >= 0) { temp3 = 0; temp4 = 0; } else temp3 = -1.0f * temp3 / (float)Tissue_helium_bar[ci]; if (temp3 > 0) { temp3 = logf(1.0f - temp3); temp3 = temp3 / -0.6931f; // temp1 is the multiples of half times necessary. // 0.6931 is ln(2), because the math function log() calculates with a base of e not 2 as requested. // minus because log is negative temp4 = buehlmann_He_t_halflife[ci] * temp3 / float_desaturation_multiplier; // time necessary (in minutes ) for "complete" desaturation, new in v.101 float_desaturation_multiplier } else { temp3 = 0; temp4 = 0; } // saturation_time (for flight) if (temp4 > temp2) int_temp = (int)temp4; else int_temp = (int)temp2; if(int_temp > int_O_desaturation_time) int_O_desaturation_time = int_temp; /*// N2 saturation in multiples of halftime for display purposes temp2 = temp1 * 20.0; // 0 = 1/8, 120 = 0, 249 = 8 temp2 = temp2 + 80.0; // set center if (temp2 < 0.0) temp2 = 0.0; if (temp2 > 255.0) temp2 = 255.0; U8_tissue_N2_saturation[ci] = (U8)temp2; // He saturation in multiples of halftime for display purposes temp4 = temp3 * 20.0; // 0 = 1/8, 120 = 0, 249 = 8 temp4 = temp4 + 80.0; // set center if (temp4 < 0.0) temp4 = 0.0; if (temp4 > 255.0) temp4 = 255.0; U8_tissue_He_saturation[ci] = (char)temp4;*/ } return int_O_desaturation_time; }