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| author | heinrichsweikamp |
|---|---|
| date | Thu, 19 Sep 2019 12:01:29 +0200 |
| parents | c40025d8e750 |
| children | 237931377539 |
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// *************************************************************************** // p2_deco.c combined next generation V3.04.3 // // Created on: 12.05.2009 // Author: heinrichs weikamp, contributions by Ralph Lembcke and others // // *************************************************************************** ////////////////////////////////////////////////////////////////////////////// // OSTC - diving computer code // Copyright (C) 2018 HeinrichsWeikamp 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/>. // ////////////////////////////////////////////////////////////////////////////// // History: // 01/03/08 v100: first release candidate // 03/13/08 v101: start of programming ppO2 code // 03/13/25 v101a: backup of interim version with ppO2 calculation // 03/13/25 v101: open circuit gas change during deco // 03/13/25 v101: CNS_fraction_real calculation // 03/13/26 v101: optimization of tissue calc routines // 07/xx/2008 v102a: debug of bottom time routine // 09/xx/2008 v102d: Gradient Factor Model implementation // 10/10/2008 v104: renamed to build v103 for v118 stable // 10/14/2008 v104: integration of char_I_depth_last_deco for Gradient Model // 03/31/2009 v107: integration of FONT Incon24 // 05/23/2010 v109: 5 gas changes & 1 min timer // 07/13/2010 v110: cns vault added // 12/25/2010 v110: split in three files (deco.c, main.c, definitions.h) // 2011/01/20: [jDG] Create a common file included in ASM and C code. // 2011/01/24: [jDG] Make ascent time an short. No more overflow! // 2011/01/25: [jDG] Fusion deco array for both models. // 2011/01/25: [jDG] Use CF(54) to reverse deco order. // 2011/02/11: [jDG] Reworked gradient-factor implementation. // 2011/02/15: [jDG] Fixed inconsistencies introduced by gas switch delays. // 2011/03/21: [jDG] Added gas consumption (CF56 & CF57) evaluation for OCR mode. // 2011/04/15: [jDG] Store GF_low_depth in 32 bits (w/o rounding), for a better stability. // 2011/04/25: [jDG] Added 1mn mode for CNS calculation, to allow it for deco planning. // 2011/04/27: [jDG] Fixed char_O_gradient_factor calculation when model uses gradient-factor. // 2011/05/02: [jDG] Added "Future TTS" function (CF58). // 2011/05/17: [jDG] Various cleanups. // 2011/08/08: [jDG] Computes CNS during deco planning ascent. // 2011/11/24: [jDG] Slightly faster and better NDL computation. // 2011/12/17: [mH] Remove of the useless debug stuff // 2012/02/24: [jDG] Remove missed stop bug. // 2012/02/25: [jDG] Looking for a more stable LOW grad factor reference. // 2012/09/10: [mH] Fill char_O_deco_time_for_log for logbook write // 2012/10/05: [jDG] Better calc_gas_needs_ascent accuracy (average depth, switch between stop). // 2013/03/05: [jDG] Should vault GF_low_depth too. // 2013/03/05: [jDG] Wrobell remark: ascent_to_first_stop works better with finer steps (2sec). // 2013/05/08: [jDG] A. Salm remark: NOAA tables for CNS are in ATA, not bar. // 2013/12/21: [jDG] Fix CNS calculation in deco plan w/o marked gas switch // 2014/06/16: [jDG] Fix Helium diluent. Fix volumes with many travel mix. // 2014/06/29: [mH] Compute int_O_ceiling // 2015/06/12: [jDG] Fix NDL prediction while desaturating with the Buhlmann model. // 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 // 2017/10/31: [rl] enhancements for pSCR mode and introduction of 2nd deco plan computation // 2017/12/31: [rl] completion of 2nd deco plan computation and various up-fixes // 2018/02/17: [rl] switch-over to new ceiling rounding (V2.98a) // // // Literature: // Buhlmann, Albert: Tauchmedizin; 4. Auflage [2002]; // Schroeder, Kai & Reith, Steffen; 2000; Saettigungsvorgaenge beim Tauchen, das Modell ZH-L16, Funktionsweise von Tauchcomputern; http://www.achim-und-kai.de/kai/tausim/saett_faq // Morrison, Stuart; 2000; DIY DECOMPRESSION; http://www.lizardland.co.uk/DIYDeco.html // Balthasar, Steffen; Dekompressionstheorie I: Neo Haldane Modelle; http://www.txfreak.de/dekompressionstheorie_1.pdf // Baker, Erik C.; Clearing Up The Confusion About "Deep Stops" // Baker, Erik C.; Understanding M-values; http://www.txfreak.de/understanding_m-values.pdf // ********************************************************************************************************************************* // // I N C L U D E S // // ********************************************************************************************************************************* #include <math.h> #include "p2_definitions.h" #define TEST_MAIN #include "shared_definitions.h" #include "configuration.inc" // ********************************************************************************************************************************* // // C O N S T A N T S D E F I N I T I O N S // // ********************************************************************************************************************************* // deco engine scheduling #define INVOKES_PER_SECOND 2 // number of invocations of the deco engine per second (use powers of 2 only: 1, 2, 4, ...) #ifdef _hwos_sport #define BUDGET_PER_SECOND 320 // [ms] total time budget per second for the deco engine, each invocation will preempt after BUDGET_PER_SECOND / INVOKES_PER_SECOND #else #define BUDGET_PER_SECOND 640 // [ms] total time budget per second for the deco engine, each invocation will preempt after BUDGET_PER_SECOND / INVOKES_PER_SECOND #endif // ambient pressure at different mountain heights #define P_ambient_1000m 0.880 // [bar] based on 990 hPa and 20°C at sea level, 15°C at altitude #define P_ambient_2000m 0.782 // [bar] #define P_ambient_3000m 0.695 // [bar] // ambient pressure in aircraft cabin during flying - worst case according to Buhlmann #define P_ambient_fly 0.600 // [bar], 0.600 bar is the value used by Buhlmann for his flying-after-diving calculations // 0.735 bar is a typical cabin pressure for nowadays commercial jet aircrafts // ----- // 0.135 bar safety margin // constants and factors #define ppWater 0.06270 // water vapor partial pressure in the lungs #define METER_TO_BAR 0.09985 // conversion factor #define BAR_TO_METER 10.0150 // conversion factor (1.0/METER_TO_BAR) #define SURFACE_DESAT_FACTOR 0.70420 // surface desaturation safety factor #define HYST 1.0E-06 // threshold for tissue graphics on-gassing / off-gassing visualization // thresholds #define CNS_LIMIT_WARNING 100 // threshold for CNS warning #define CNS_LIMIT_ATTENTION 70 // threshold for CNS attention #define PRESSURE_LIMIT_WARNING 200 // threshold for pressure reading warning : 20.0 bar #define PRESSURE_LIMIT_ATTENTION 500 // threshold for pressure reading attention: 50.0 bar #define GAS_NEEDS_LIMIT_ATTENTION 0.70 // threshold for gas needs attention [1.00 = 100%] #define O2_CONSUMPTION_LIMIT_ATTENTION 20 // threshold for O2 "SAC" attention: 2.0 l/min #define ppO2_GAP_TO_SETPOINT 10 // gap between setpoint and max. ppO2 of the pure diluent [cbar] #define ppO2_MARGIN_ON_MAX 3 // [cbar] margin on ppO2 max to compensate for surface pressures > 1.000 mbar #define STOP_CHAINING_LIMIT 5 // max. number of chained stop table entries before deco calculation is aborted // deco engine states and modes - (char_O_)main_status: controls current tissue and deco status calculation (as-is situation) #define CALC_VOLUME 0x01 // =1: calculate gas needs #define CALCULATE_BOTTOM 0x02 // =1: calculate gas needs in deco calculator mode, =0: in dive mode #define CAVE_MODE 0x04 // =1: calculate ascent and gas needs using backtracking data #define USE_Z_FACTOR 0x08 // =1: calculate with Z factor when converting gas volumes <-> pressures #define TR_FUNCTIONS 0x10 // =1: calculate TR functions (pressure reading) processing #define EXTENDED_STOPS 0x20 // =1: allow placement of gas switches below the depth of the 1st stop #define MODE_MASK 0xC0 // mask for real tissues mode selection #define MODE_LOOP 0x40 // =1: CCR (MODE_PSCR needs to be cleared) or pSCR mode #define MODE_CCR 0x40 // to be used with == operator in combination with MODE_MASK only! #define MODE_PSCR 0x80 // =1: pSCR mode (MODE_LOOP needs to be set, too) // deco engine states and modes - (char_O_)deco_status: controls deco plan calculation (to-be scenario) #define PLAN_MASK 0x03 // bit mask covering normal & alternative plan flag #define COMMAND_MASK 0x07 // bit mask covering all command flags #define CALCULATING 0x00 // calculations are ongoing #define START_NORM 0x01 // input: start calculation of a normal deco plan #define CALC_NORM 0x01 // internal: calculating a normal deco plan #define COMPLETED_NORM 0x01 // output: calculation of a normal deco plan has completed #define START_ALT 0x02 // input: start calculation of an alternative deco plan #define CALC_ALT 0x02 // internal: calculating an alternative deco plan #define COMPLETED_ALT 0x02 // output: calculation of an alternative deco plan has completed #define INITIALIZE 0x04 // input: initialize deco engine #define INITIALIZE_START_NORM 0x05 // input: initialize deco engine and start calculation of a normal deco plan #define INITIALIZE_START_ALT 0x06 // input: initialize deco engine and start calculation of an alternative deco plan #define DECO_CALCULATOR_MODE 0x08 // input: deco engine is run from deco calculator #define BAILOUT_MODE 0x10 // =1: allow gas switches before first deco stop #define DELAYED_ASCENT 0x20 // =1: figure in a delayed ascent (fTTS) // MODE_MASK 0xC0 // mask for simulated tissues mode selection // MODE_LOOP 0x40 // =1: CCR (MODE_PSCR needs to be cleared) or pSCR mode // MODE_CCR 0x40 // to be used with == operator in combination with MODE_MASK only! // MODE_PSCR 0x80 // =1: pSCR mode (MODE_LOOP needs to be set, too) // deco engine warnings - (char_O_)deco_warnings #define DECO_WARNING_IBCD 0x01 // IBCD occurring now #define DECO_WARNING_IBCD_lock 0x02 // IBCD has occurred during the dive #define DECO_WARNING_MBUBBLES 0x04 // micro bubbles likely to develop now #define DECO_WARNING_MBUBBLES_lock 0x08 // ditto, but sometime during the dive #define DECO_WARNING_OUTSIDE 0x10 // tissue pressures outside the Buhlmann model now #define DECO_WARNING_OUTSIDE_lock 0x20 // tissue pressures outside the model sometime during the dive #define DECO_ATTENTION_OUTSIDE 0x40 // tissue pressures are very close to the Buhlmann limit #define DECO_WARNING_INCOMPLETE 0x80 // internal error: deco calculation incomplete // deco engine status (char_O_)deco_info #define DECO_MODE 0x01 // =1: deco ppO2 levels are permitted #define IND_DOUBLE_SWITCH_FLAG 0x02 // =1: switch to other tank advice active // 0x04 // --- unused #define DECO_ZONE 0x08 // =1: fTTS < TTS (not updated when in bailout mode) #define DECO_CEILING 0x10 // =1: ceiling depth > 0 #define DECO_STOPS 0x20 // =1: deco stops found #define GAS_NEEDS_CAVE 0x40 // =1: indicated gas needs are calculated in cave mode // 0x80 // --- unused // deco engine control - tissue_increment #define TIME_MASK 0x7F // =0: time increment is 2 seconds, 1..127: time increments is 1..127 minutes #define TISSUE_SELECTOR 0x80 // =1: calculate on real tissues, =0: calculate on simulated tissues // deco engine control - next_planning_phase #define PHASE_00_DONE 0x00 // calculation cycle finished #define PHASE_10_DIVE_INIT 0x10 // once-per-dive initialization of the deco engine #define PHASE_20_CYCLIC_INIT 0x20 // once-every-cycle initialization of the deco engine #define PHASE_30_EXTENDED_BOTTOM_TIME 0x30 // calculate extended bottom time #define PHASE_40_BOTTOM_GAS_NEED 0x40 // calculate gas needs for bottom segment #define PHASE_50_NDL_TIME 0x50 // calculate NDL time #define PHASE_60_CAVE_RETURN 0x60 // calculate cave mode return #define PHASE_70_OPEN_WATER_ASCENT 0x70 // calculate open water ascent #define PHASE_80_RESULTS 0x80 // results - initialization #define PHASE_81_RESULTS_STOPS_TABLE 0x81 // results - publish stops table #define PHASE_82_RESULTS_NDL 0x82 // results - publish data / within NDL #define PHASE_83_RESULTS_DECO 0x83 // results - publish data / in deco #define PHASE_84_GAS_NEEDS_PRESSURES 0x84 // results - convert gas needs from volumes to pressures #define PHASE_90_FINISH 0x90 // finish calculation cycle // flags used with integer numbers #define INT_FLAG_INVALID 0x0400 // =1: value not valid #define INT_FLAG_NOT_COMPUTED_YET 0x0800 // =1: value not computed yet #define INT_FLAG_ZERO 0x0800 // =1: value is zero #define INT_FLAG_LOW 0x1000 // =1: value is below a lower warning threshold #define INT_FLAG_NOT_AVAIL 0x1000 // =1: value is not available (not computed) #define INT_FLAG_HIGH 0x2000 // =1: value is above an upper warning threshold #define INT_FLAG_OUTDATED 0x2000 // =1: value has not been updated for too long #define INT_FLAG_ATTENTION 0x4000 // =1: value exceeds the attention threshold #define INT_FLAG_WARNING 0x8000 // =1: value exceeds the warning threshold #define INT_FLAG_OUT_OF_RANGE 0x8000 // =1: value exceeds presentable range // ********************************************************************************************************************************* // // ** P R O T O T Y P E S ** // // The Functions are listed in sequence of intended usage / application. // // ********************************************************************************************************************************* // Functions used in Surface Mode static void calc_interval(PARAMETER unsigned char time_increment); // Calculates the tissue off-gassing under surface conditions. static void calc_desaturation_time(void); // Calculates the desaturation and no-fly times. static void clear_tissue(void); // Resets all tissues to surface pressure equilibrium state. static void init_output_vars(void); // Initializes all deco engine output variables to defaults // Main entry point in Dive Mode static void calc_hauptroutine(void); // Sequences all calculations for the real tissues and the deco calculation. // Functions dedicated to the real Tissues static void calc_hauptroutine_data_input(void);// Initializes environment data and sets gas ratios for the real tissues. // Functions combined for real Tissues & Deco Calculations static void calc_alveolar_pressures(void); // Computes the partial pressures from the gas ratios and many more parameters, // needs either calc_hauptroutine_data_input() be called beforehand or // gas_take_current() or gas_find_best()/gas_take_best() and gas_set_ratios(). static void calc_tissues(void); // Updates the tissues dependent on the partial pressures of N2 and He. static void calc_CNS(void); // Updates the CNS value dependent on the partial pressure of the O2. static void calc_limit(PARAMETER float GF_current); // Calculates ceiling, current GF (supersaturation) and some more data. // Functions for TR #ifdef _rx_functions static void calc_TR_functions(void); // Calculates SAC etc. #endif // Functions dedicated to Deco Calculations static void clear_deco_table(void); // Clears the deco stops table, invoked at the start of each calculation cycle. static void gas_take_current(void); // Sets the first gas used for deco calculation, invoked at start of cycle, too. static unsigned char gas_find_best(void); // Searches for the best gas available. static void gas_take_best(void); // Switches to the best gas that has been found found before by gas_find_best(). static void gas_set_ratios(void); // Sets the gas ratios for use in deco calculation (simulated tissues), // needs to be called after each gas change (gas_take_current/_better). static void calc_NDL_time_tissue(void); // Calculates the remaining NDL time for a given tissue. static unsigned char find_next_stop(void); // Finds the next stop when in a deco ascent. static unsigned char update_deco_table(PARAMETER unsigned char time_increment); // Enters a new stop or extends an existing stop in the deco stops table. static void calc_due_by_depth_time_sac(void); // Calculates gas volume required for a given depth, time and usage (SAC rate). static void convert_gas_needs_to_press(void); // Converts gas volumes into pressures and sets respective flags. // Functions for Results Reporting static void publish_deco_table(void); // Copies the internal deco stops table to the export interface. static void convert_cur_CNS_for_display(void); // Converts the current CNS value from float to integer. static void convert_sim_CNS_for_display(void); // Converts the end-of-dive CNS value from float to integer. static void convert_sat_for_display(void); // Converts leading tissue saturation value from float to integer, 1.0 = 100%. static void convert_ceiling_for_display(void); // Converts ceiling from float to integer in mbar relative pressure. // internal helper Functions static void load_tmr5(void); // Loads a hardware timer which is used for preemptive scheduling. static void read_tmr5(void); // Reads a hardware timer which is used for preemptive scheduling. static void read_CNS_ab_coefficient(void); // Reads the CNS a and b coefficients from a ROM table. static void read_CNS_c_coefficient(void); // Reads the CNS c coefficient from a ROM table. static void read_Buhlmann_coefficients(void); // Reads the Buhlmann a and b coefficients from a ROM table. static void read_Buhlmann_times(PARAMETER char period); // Reads pre-computed tissue increment factors from a ROM table. static void read_Buhlmann_ht(void); // Reads the half-times from a ROM table. static void adopt_Buhlmann_coefficients(void); // Computes average a and b coefficient by the N2/He tissue ratio. static void push_tissues_to_vault(void); // Stores the state of the real tissues during simulator runs. static void pull_tissues_from_vault(void); // Restores the state of the real tissues after a simulator run. static void calc_sim_pres_respiration(void); // Calculate sim_pres_respiration from char_depth_sim. static void calc_N2_equilibrium(void); // Calculate partial pressure of N2 in respired air at surface pressure. static void get_saturation_factors(void); // Get, safeguard and convert the saturation and desaturation factors. static void apply_saturation_factors(void); // Applies saturation and desaturation factors. // ********************************************************************************************************************************* // // V A R I A B L E S D E F I N I T I O N S // // ********************************************************************************************************************************* //---- Bank 5 parameters ----------------------------------------------------- #ifndef UNIX # pragma udata bank5=0x500 #endif // Environmental and Gas Data (52 byte) static float pres_surface; // absolute pressure at the surface static float float_depth_real; // current real depth in meters, float static unsigned char char_depth_real; // current real depth in meters, integer static unsigned char char_depth_sim_start; // start value of simulated depth in meters, integer static unsigned char char_depth_sim; // current value of simulated depth in meters, integer static unsigned char char_depth_last; // last value of simulated depth in meters, integer static float real_pres_respiration; // current real depth in absolute pressure static float real_O2_ratio; // real breathed gas oxygen ratio static float real_N2_ratio; // real breathed gas nitrogen ratio static float real_He_ratio; // real breathed gas helium ratio static float real_pSCR_drop; // real ppO2 drop in pSCR loop static float sim_pres_respiration; // simulated current depth in abs.pressure, used for deco calculations static float sim_O2_ratio; // simulated breathed gas oxygen ratio static float sim_N2_ratio; // simulated breathed gas nitrogen ratio static float sim_He_ratio; // simulated breathed gas helium ratio static float sim_pSCR_drop; // simulated ppO2 drop in pSCR loop // general Deco Parameters (57 byte) static float GF_low; // gradient factor to determine 1st stop static float GF_high; // gradient factor to determine surfacing static unsigned char GF_low_last; // last GF low, used to detect changes static unsigned char GF_high_last; // last GF high, used to detect changes static unsigned char GF_low_depth; // GF low reference depth in current calculation cycle static unsigned char GF_low_depth_norm; // GF low reference depth in normal plan static unsigned char GF_low_depth_alt; // GF low reference depth in alternative plan static float GF_slope; // (GF_high - GF_low) / GF_low_depth in current calculation cycle static float GF_slope_norm; // (GF_high - GF_low) / GF_low_depth_norm in normal plan static float GF_slope_alt; // (GF_high - GF_low) / GF_low_depth_alt in alternative plan static float float_ascent_speed; // ascent speed from options_table (5.0 .. 10.0 m/min) static float float_deco_distance; // additional depth below stop depth - not used any more static float float_saturation_multiplier; // safety factor for on-gassing rates static float float_desaturation_multiplier; // safety factor for off-gassing rates static unsigned char split_N2_He[NUM_COMP]; // used for calculating the desaturation time // real Context: what we are doing now (16 byte) static float CNS_fraction_real; // current real CNS (1.00 = 100%) static unsigned short IBCD_tissue_vector; // 16 bit vector to memorize all tissues that experience IBCD static float pres_respiration_sac; // used in SAC calculation: current depth in absolute pressure static float float_sac; // used in SAC calculation: SAC value in float static unsigned short max_sac_rate; // used in SAC calculation: threshold for SAC rate attention // simulated Context: used to calculate Ascent (11 byte) static float CNS_fraction_sim; // CNS after predicted ascent, 0.01 = 1%, as float static unsigned short int_sim_CNS_fraction; // CNS after predicted ascent, 1 = 1%, as integer static unsigned char NDL_tissue_start_norm; // tissue to start with when calculating the normal NDL time static unsigned char NDL_tissue_start_alt; // tissue to start with when calculating the alternative NDL time static unsigned char NDL_tissue_start; // tissue to start with in current cycle static unsigned char NDL_tissue_lead; // tissue with the shortest NDL time found in current cycle static unsigned char NDL_tissue; // tissue for which the NDL is calculated right now // Result Values from Calculation Functions (9 byte) static float ceiling; // minimum tolerated relative pressure (i.e. without surface pressure) static float lead_supersat; // supersaturation of the leading tissue, 1.0 = 100% static unsigned char lead_tissue; // number of the leading tissue // Transfer Variables between calc_desaturation_time() and calc_desaturation_time_helper() (18 byte) static float desat_factor; // used to cache a pre-computed factor static float var_ht; // buffer for a half-time factor static float pres_target; // target pressure for a compartment static float pres_actual; // current pressure of the compartment static unsigned short int_time; // time it takes for the compartment to reach the target pressure // Gas in Use and Gas Needs (26 byte) static unsigned char sim_gas_last_num; // number of the last used gas static unsigned char sim_gas_current_num; // number of the currently used gas static unsigned char sim_gas_current_depth; // change depth of the currently used gas static unsigned char sim_gas_best_num; // number of the better gas static unsigned char sim_gas_best_depth; // change depth of the better gas static unsigned char gas_needs_gas_index; // index to the gas and tank data arrays static float gas_volume_need[NUM_GAS]; // gas volumes required for return/ascent in liters static float gas_volume_avail[NUM_GAS]; // gas volumes available for return/ascent in liters // Transfer Variables for calc_due_by_depth_time_sac() (7 byte) static unsigned char gas_needs_depth; // depth of the stop or half-way point static unsigned char gas_needs_time; // duration of the stop or ascent phase static unsigned char gas_needs_usage_rate; // gas usage in l/min static float gas_needs_volume_due; // computed due of gas volume required // Auxiliary Variables for Data Buffering (28 byte) static float N2_equilibrium; // used for N2 tissue graphics scaling static float temp_tissue; // auxiliary variable to buffer tissue pressures static float float_pSCR_factor; // pre-computed factor for pSCR ppO2 drop calculation static float calc_pres_tissue_N2; // auxiliary variable to buffer tissue N2 pressure static float calc_pres_tissue_He; // auxiliary variable to buffer tissue He pressure static float pres_tissue; // auxiliary variable to buffer total tissue pressure static float old_pres_respiration; // auxiliary variable to buffer sim_pres_respiration // 244 byte used, 12 byte left in this bank (4 bytes per float, 2 bytes per short, 1 byte per char) //---- Bank 6 parameters ----------------------------------------------------- #ifndef UNIX # pragma udata bank6=0x600 #endif // Timer5 Interface (3 byte) - Attention: keep order and keep at beginning of bank 6, i.e. at address 0x600 ! static volatile unsigned short tmr5_value; // timer 5 value buffer MUST be at address 0x600 static volatile unsigned char tmr5_overflow; // timer 5 overflow flag MUST be at address 0x602 // Modes, Sequencing and Indexing (12 byte) static unsigned char main_status; // shadow register for char_O_main_status static unsigned char deco_status; // shadow register for char_O_deco_status static unsigned char deco_info; // shadow register for char_O_deco_info static unsigned char deco_warnings; // shadow register for char_O_deco_warnings static unsigned char next_planning_phase; // next calculation phase to be executed static unsigned char tissue_increment; // selector for real/simulated tissues and time increment static unsigned char sequence_timer; // timer to sequence deco engine tasks static unsigned char ci; // index to the Buhlmann tables (compartment index) static unsigned char cns_i; // index to the CNS tables (ppO2 range index) static unsigned char i; // general purpose loop counter and index static unsigned char fast; // selects 1 minute or 2 second ascent steps static unsigned char stop_index; // current stop table position static unsigned char chained_stops; // counter for chained stop entries // Result Values from Calculation Functions (28 byte) static float O2_ppO2; // ppO2 - calculated for pure oxygen at current depth static float OC_ppO2; // ppO2 - calculated for breathing in OC mode static float pSCR_ppO2; // ppO2 - calculated for breathing in pSCR mode static float ppO2; // partial pressure of breathed oxygen static float ppN2; // partial pressure of breathed nitrogen static float ppHe; // partial pressure of breathed helium static unsigned char char_ppO2; // partial pressure of breathed oxygen, as integer 100 = 1.00 bar static unsigned char NDL_time; // time in minutes until reaching NDL static unsigned short ascent_time; // time in minutes needed for the ascent // Buhlmann Model Parameters (40 byte) static float var_N2_a; // Buhlmann a, for current N2 tissue static float var_N2_b; // Buhlmann b, for current N2 tissue static float var_He_a; // Buhlmann a, for current He tissue static float var_He_b; // Buhlmann b, for current He tissue static float var_a; // Buhlmann a, adopted to current N2/He ratio static float var_b; // Buhlmann b, adopted to current N2/He ratio static float var_N2_e; // exposition, for current N2 tissue static float var_He_e; // exposition, for current He tissue static float var_N2_ht; // half-time, for current N2 tissue static float var_He_ht; // half-time, for current He tissue // CNS Coefficients (10 byte) static float var_cns_a; // two coefficients approximation, gain static float var_cns_b; // two coefficients approximation, offset static unsigned short var_cns_c; // one coefficient approximation, value // Vault to back-up & restore Tissue related Data (134 byte) static float vault_pres_tissue_N2[NUM_COMP]; // stores the nitrogen tissue pressures static float vault_pres_tissue_He[NUM_COMP]; // stores the helium tissue pressures static float vault_CNS_fraction_real; // stores current CNS (float representation) static unsigned char vault_deco_warnings; // stores warnings status static unsigned char vault_deco_info; // stores info status // Transfer values for convert_float_int and convert_float_to_char() (7 byte) static float float_value; // input value, float static unsigned short int_value; // output value, 16 bit static unsigned char char_value; // output value, 8 bit // Performance Profiling (4 byte) static unsigned short profiling_runtime; // performance measurement: runtime of current invocation static unsigned char profiling_runs; // performance measurement: invocations per deco calculation cycle static unsigned char profiling_phase; // performance measurement: current calculation phase // 7 byte occupied by compiler-placed vars // 245 byte used, 11 byte left in this bank (4 bytes per float, 2 bytes per short, 1 byte per char) //---- Bank 12 parameters ----------------------------------------------------- #ifndef UNIX # pragma udata bank12=0xc00 #endif // stops table (96 byte) static unsigned char internal_deco_depth[NUM_STOPS]; // depths of the stops in meters static unsigned char internal_deco_time[NUM_STOPS]; // durations of the stops in minutes static unsigned char internal_deco_gas[NUM_STOPS]; // gases used on the stops (0 / 1-5) // 96 byte used, 160 byte left in this bank (4 bytes per float, 2 bytes per short, 1 byte per char) //---- Bank 7 parameters ----------------------------------------------------- #ifndef UNIX # pragma udata bank7=0x700 #endif // Keep order and position of the variables in bank 7 as they are backed-up to & restored from EEPROM static float real_pres_tissue_N2[NUM_COMP]; // 16 floats = 64 bytes static float real_pres_tissue_He[NUM_COMP]; // 16 floats = 64 bytes static float sim_pres_tissue_N2[NUM_COMP]; // 16 floats = 64 bytes static float sim_pres_tissue_He[NUM_COMP]; // 16 floats = 64 bytes // 256 byte used, bank is full //---- Bank 8 parameters ----------------------------------------------------- #ifndef UNIX # pragma udata overlay bank8=0x800 static char md_pi_subst[256]; // overlay C-code data stack here, too # define C_STACK md_pi_subst #endif // Back to bank6 for further tmp data // Do not delete this assignment, it is needed by the compiler/linker. #ifndef UNIX # pragma udata bank6 #endif // ********************************************************************************************************************************* // // L O O K - U P T A B L E S // // ********************************************************************************************************************************* #ifndef UNIX # pragma romdata CNS_tables = 0x1DC80 // needs to be in the UPPER bank #endif rom const float CNS_ab[2*11] = { // CNS increment per 2 sec = 1 / (a*ppO2 + b) with ppO2 in [cbar] // a b for ppO2 cbar range -533.07, 54000, // 51 - 60 (index 0) -444.22, 48600, // 61 - 70 (index 1) -355.38, 42300, // 71 - 80 (index 2) -266.53, 35100, // 81 - 90 (index 3) -177.69, 27000, // 91 - 100 (index 4) -177.69, 27000, // 101 - 110 (index 5) -88.84, 17100, // 111 - 120 (index 6) -88.84, 17100, // 121 - 130 (index 7) -88.84, 17100, // 131 - 140 (index 8) -88.84, 17100, // 141 - 150 (index 9) -222.11, 37350 // 151 - 160 (index 10) }; rom const unsigned short CNS_c[1*18] = { // CNS increment per 2 sec = c / 100000.0 // c in [1/100000] for ppO2 cbar range 75, // 161 - 165 (index 0) 102, // 166 - 170 (index 1) 136, // 171 - 175 (index 2) 180, // 176 - 180 (index 3) 237, // 181 - 185 (index 4) 310, // 186 - 190 (index 5) 401, // 191 - 195 (index 6) 517, // 196 - 200 (index 7) 760, // 201 - 205 (index 8) 1100, // 206 - 210 (index 9) 1500, // 211 - 215 (index 10) 2090, // 216 - 220 (index 11) 2900, // 221 - 225 (index 12) 3900, // 226 - 230 (index 13) 4820, // 231 - 235 (index 14) 4820, // 236 - 240 (index 15) 4820, // 241 - 245 (index 16) 4820 // 246 - 250 (index 17) }; #ifndef UNIX # pragma romdata Buhlmann_tables = 0x1DD00 // needs to be in the UPPER bank #endif rom const float Buhlmann_ab[4*16] = { // Data ZH-L16C, from Bühlmann Tauchmedizin 2002, option 1a (4mn) // a for N2 b for N2 a of He b for He 1.2599, 0.5050, 1.7424, 0.4245, 1.0000, 0.6514, 1.3830, 0.5747, 0.8618, 0.7222, 1.1919, 0.6527, 0.7562, 0.7825, 1.0458, 0.7223, 0.6200, 0.8126, 0.9220, 0.7582, 0.5043, 0.8434, 0.8205, 0.7957, 0.4410, 0.8693, 0.7305, 0.8279, 0.4000, 0.8910, 0.6502, 0.8553, 0.3750, 0.9092, 0.5950, 0.8757, 0.3500, 0.9222, 0.5545, 0.8903, 0.3295, 0.9319, 0.5333, 0.8997, 0.3065, 0.9403, 0.5189, 0.9073, 0.2835, 0.9477, 0.5181, 0.9122, 0.2610, 0.9544, 0.5176, 0.9171, 0.2480, 0.9602, 0.5172, 0.9217, 0.2327, 0.9653, 0.5119, 0.9267 }; rom const float Buhlmann_ht[2*16] = { // Compartment half-life, in minutes //--- N2 ---- He ---------------------- 4.0, 1.51, 8.0, 3.02, 12.5, 4.72, 18.5, 6.99, 27.0, 10.21, 38.3, 14.48, 54.3, 20.53, 77.0, 29.11, 109.0, 41.20, 146.0, 55.19, 187.0, 70.69, 239.0, 90.34, 305.0, 115.29, 390.0, 147.42, 498.0, 188.24, 635.0, 240.03 }; rom const float e2secs[2*16] = { // Integration constant for 2 seconds, // result of 1 - 2^(-1/(2sec/60sec * HT)) //---- N2 ------------- He ------------ 5.75958E-03, 1.51848E-02, 2.88395E-03, 7.62144E-03, 1.84669E-03, 4.88315E-03, 1.24813E-03, 3.29997E-03, 8.55371E-04, 2.26041E-03, 6.03079E-04, 1.59437E-03, 4.25414E-04, 1.12479E-03, 3.00019E-04, 7.93395E-04, 2.11949E-04, 5.60641E-04, 1.58240E-04, 4.18555E-04, 1.23548E-04, 3.26795E-04, 9.66686E-05, 2.55722E-04, 7.57509E-05, 2.00387E-04, 5.92416E-05, 1.56716E-04, 4.63943E-05, 1.22734E-04, 3.63850E-05, 9.62538E-05 //------------------------------------- }; rom const float e1min[2*16] = { // Integration constant for 1 minute, // result of 1 - 2^(-1/HT) //----- N2 --------- e 1min He -------- 1.59104E-01, 3.68109E-01, 8.29960E-02, 2.05084E-01, 5.39424E-02, 1.36579E-01, 3.67742E-02, 9.44046E-02, 2.53454E-02, 6.56359E-02, 1.79351E-02, 4.67416E-02, 1.26840E-02, 3.31991E-02, 8.96152E-03, 2.35301E-02, 6.33897E-03, 1.66832E-02, 4.73633E-03, 1.24808E-02, 3.69981E-03, 9.75753E-03, 2.89600E-03, 7.64329E-03, 2.27003E-03, 5.99417E-03, 1.77572E-03, 4.69082E-03, 1.39089E-03, 3.67548E-03, 1.09097E-03, 2.88359E-03 //------------------------------------- }; rom const float e10min[2*16] = { // Integration constant for 10 minutes, // result of 1 - 2^(-10/ht) //---- N2 -------------- He ----------- 8.23223E-01, 9.89851E-01, 5.79552E-01, 8.99258E-01, 4.25651E-01, 7.69737E-01, 3.12487E-01, 6.29027E-01, 2.26416E-01, 4.92821E-01, 1.65547E-01, 3.80407E-01, 1.19840E-01, 2.86538E-01, 8.60863E-02, 2.11886E-01, 6.16117E-02, 1.54849E-01, 4.63665E-02, 1.18026E-01, 3.63881E-02, 9.34005E-02, 2.85855E-02, 7.38569E-02, 2.24698E-02, 5.83504E-02, 1.76160E-02, 4.59303E-02, 1.38222E-02, 3.61528E-02, 1.08563E-02, 2.84646E-02 //------------------------------------- }; // ********************************************************************************************************************************* // // H E L P E R F U N C T I O N S // // ********************************************************************************************************************************* // p2deco code moved from 0x0D000 to 0x0C000 in v.108 #ifndef UNIX # pragma code p2_deco = 0x0C000 #endif ////////////////////////////////////////////////////////////////////////////// // Bump to blue-screen when an assert is wrong #ifdef _DEBUG void assert_failed(PARAMETER short int line) { } #endif ////////////////////////////////////////////////////////////////////////////// // When calling C code from ASM context, the C data stack pointer need to be // reset. The C stack is located in bank 8. #ifdef CROSS_COMPILE # define RESET_C_STACK #else # ifdef _DEBUG # define RESET_C_STACK fillDataStack(); void fillDataStack(void) { _asm LFSR 1,C_STACK MOVLW 0xCC loop: MOVWF POSTINC1,0 TSTFSZ FSR1L,0 BRA loop LFSR 1,C_STACK LFSR 2,C_STACK _endasm } # else # define RESET_C_STACK \ _asm \ LFSR 1,C_STACK \ LFSR 2,C_STACK \ _endasm # endif #endif ////////////////////////////////////////////////////////////////////////////// // Reset timer 5 // // Note: TMR5 is configured in 16 bit mode: a value written to TMR5H is buffered // and will be written to TMR5 together with a successive write to TMR5L. // As we don't know in which bank the code will be executed, we use either // the bank-save "movff" command, or address mapping via access bank (",0"). // static void load_tmr5(void) { #ifndef CROSS_COMPILE _asm movff 0x601,0xF7D // bank-safe load TMR5H from C variable tmr5_value first movff 0x600,0xF7C // bank-safe load TMR5L from c variable tmr5_value thereafter bcf 0xFBA,1,0 // clear timer 5 overrun flag (0xFBA = PIR5, bit 1 = TMR5IF) _endasm #else return; #endif } ////////////////////////////////////////////////////////////////////////////// // Read timer 5 // // Note: TMR5 reads in multiples of 1/32 ms, 30.51757813 us/bit to be precise. // TMR5 is configured in 16 bit mode: on reading of TMR5L the contents of // TMR5H is latched and can be read afterwards without potential rollover. // As we don't know in which bank the code will be executed, we use either // the bank-save "movff" command, or address mapping via access bank (",0"). // static void read_tmr5(void) { #ifndef CROSS_COMPILE _asm movff 0xF7C,0x600 // copy TMR5L to C variable tmr5_value, low byte first movff 0xF7D,0x601 // copy TMR5H to C variable tmr5_value, high byte thereafter clrf WREG,0 // clear WREG to 0x00 = no overrun by default btfsc 0xFBA,1,0 // did timer 5 overrun? (0xFBA = PIR5, bit 1 = TMR5IF) setf WREG,0 // YES - set WREG to 0xff = overrun detected movff WREG,0x602 // copy WREG to C variable tmr5_overflow _endasm #else return; #endif } ////////////////////////////////////////////////////////////////////////////// // Read CNS coefficients a and b // static void read_CNS_ab_coefficient(void) { #ifndef CROSS_COMPILE // Note: We don't use far ROM pointer, because handling // 24 bit is to complex, hence we have to set the // UPPER page ourself... // -> set to zero if tables are moved to lower pages! _asm movlw 1 movwf TBLPTRU,0 _endasm #endif { overlay rom const float* ptr = &CNS_ab[2*cns_i]; var_cns_a = *ptr++; var_cns_b = *ptr++; } } ////////////////////////////////////////////////////////////////////////////// // Read CNS coefficient c // static void read_CNS_c_coefficient(void) { #ifndef CROSS_COMPILE // Note: We don't use far ROM pointer, because handling // 24 bit is to complex, hence we have to set the // UPPER page ourself... // -> set to zero if tables are moved to lower pages! _asm movlw 1 movwf TBLPTRU,0 _endasm #endif { overlay rom const unsigned short* ptr = &CNS_c[cns_i]; var_cns_c = *ptr++; } } ////////////////////////////////////////////////////////////////////////////// // Read Buhlmann coefficients a and b for compartment ci // static void read_Buhlmann_coefficients(void) { #ifndef CROSS_COMPILE // Note: We don't use far ROM pointer, because handling // 24 bit is too complex, hence we have to set the // UPPER page ourself... // -> set to zero if tables are moved to lower pages! _asm movlw 1 movwf TBLPTRU,0 _endasm #endif assert( ci < NUM_COMP ); // use an interleaved array (AoS) to access coefficients with a single addressing { overlay rom const float* ptr = &Buhlmann_ab[4*ci]; var_N2_a = *ptr++; var_N2_b = *ptr++; var_He_a = *ptr++; var_He_b = *ptr++; } } ////////////////////////////////////////////////////////////////////////////// // Read Buhlmann increments for compartment ci // If period == 0 : 2 sec interval // 1 : 1 min interval // 2 : 10 min interval static void read_Buhlmann_times(PARAMETER char period) { #ifndef CROSS_COMPILE // Note: We don't use far ROM pointer, because handling // 24 bit is to complex, hence we have to set the // UPPER page ourself... // -> set to zero if tables are moved to lower pages! _asm movlw 1 movwf TBLPTRU,0 _endasm #endif assert( ci < NUM_COMP ); // Integration Intervals switch(period) { case 0: //---- 2 sec ----------------------------------------------------- { overlay rom const float* ptr = &e2secs[2*ci]; var_N2_e = *ptr++; var_He_e = *ptr++; } break; case 1: //---- 1 min ----------------------------------------------------- { overlay rom const float* ptr = &e1min[2*ci]; var_N2_e = *ptr++; var_He_e = *ptr++; } break; case 2: //---- 10 min ---------------------------------------------------- { overlay rom const float* ptr = &e10min[2*ci]; var_N2_e = *ptr++; var_He_e = *ptr++; } break; default: assert(0); // code execution shall never pass along here! } } ////////////////////////////////////////////////////////////////////////////// // Read Buhlmann half-times for compartment ci // static void read_Buhlmann_ht(void) { #ifndef CROSS_COMPILE // Note: We don't use far ROM pointer, because handling // 24 bit is to complex, hence we have to set the // UPPER page ourself... // -> Set to zero if tables are moved to lower pages! _asm movlw 1 movwf TBLPTRU,0 _endasm #endif assert( ci < NUM_COMP ); { overlay rom const float* ptr = &Buhlmann_ht[2*ci]; var_N2_ht = *ptr++; var_He_ht = *ptr++; } assert( 4.0 <= var_N2_ht && var_N2_ht <= 635.0 ); assert( 1.5099 <= var_He_ht && var_He_ht <= 240.03 ); } ////////////////////////////////////////////////////////////////////////////// // Calculate adopted Buhlmann coefficients // // Input: var_N2_a, var_N2_b coefficients for N2 // var_He_a, var_He_b coefficients for He // calc_pres_tissue_N2 partial pressure of N2 in tissue // calc_pres_tissue_He partial pressure of He in tissue // pres_tissue total pressure in tissue // // Output: var_a, var_b coefficients adopted by N2/He ratio // static void adopt_Buhlmann_coefficients(void) { // adopt a and b coefficients to current N2/He ratio inside the tissue #ifdef _helium var_a = (var_N2_a * calc_pres_tissue_N2 + var_He_a * calc_pres_tissue_He) / pres_tissue; var_b = (var_N2_b * calc_pres_tissue_N2 + var_He_b * calc_pres_tissue_He) / pres_tissue; #else var_a = var_N2_a; var_b = var_N2_b; #endif } ////////////////////////////////////////////////////////////////////////////// // Calculate sim_pres_respiration from char_depth_sim // // Input: char_depth_sim simulated depth in meters // pres_surface surface pressure // // Output: sim_pres_respiration simulated depth in absolute pressure // static void calc_sim_pres_respiration(void) { sim_pres_respiration = (float)char_depth_sim * METER_TO_BAR + pres_surface; } ////////////////////////////////////////////////////////////////////////////// // Calculate partial pressure of N2 in respired air at surface pressure // // Input: pres_surface surface pressure // // Output: N2_equilibrium partial pressure of N2 in surface air // static void calc_N2_equilibrium(void) { N2_equilibrium = 0.7902 * (pres_surface - ppWater); } ////////////////////////////////////////////////////////////////////////////// // Get, safeguard and convert the saturation and desaturation factors // // Input: char_I_saturation_multiplier saturation factor (integer) // char_I_desaturation_multiplier desaturation factor (integer) // // Output: float_saturation_multiplier saturation factor (float) // float_desaturation_multiplier desaturation factor (float) // static void get_saturation_factors(void) { // safeguard input parameters that are constant during the course of the dive if( char_I_saturation_multiplier < 100 ) char_I_saturation_multiplier = 100; if( char_I_saturation_multiplier > 140 ) char_I_saturation_multiplier = 140; if( char_I_desaturation_multiplier < 60 ) char_I_desaturation_multiplier = 60; if( char_I_desaturation_multiplier > 100 ) char_I_desaturation_multiplier = 100; // convert input parameters to float numbers float_saturation_multiplier = 0.01 * char_I_saturation_multiplier; float_desaturation_multiplier = 0.01 * char_I_desaturation_multiplier; } ////////////////////////////////////////////////////////////////////////////// // apply_saturation_factors // // Apply safety factors for both ZH-L16 models. // // Modified: temp_tissue safeguarded tissue increment/decrement // static void apply_saturation_factors(void) { assert( 0.0 < float_desaturation_multiplier && float_desaturation_multiplier <= 1.0 ); assert( 1.0 <= float_saturation_multiplier && float_saturation_multiplier <= 2.0 ); if ( temp_tissue < 0.0 ) temp_tissue *= float_desaturation_multiplier; else temp_tissue *= float_saturation_multiplier; } ////////////////////////////////////////////////////////////////////////////// // convert_float_to_int // // Converts a float within range 0.0 - 9.99 into 16 bit integer scaled in 1/100. // static void convert_float_to_int(void) { if ( float_value < 0.005 ) int_value = 0; else if ( float_value >= 9.985 ) int_value = 999; else int_value = (unsigned short)(100 * float_value + 0.5); } ////////////////////////////////////////////////////////////////////////////// // convert_float_to_char // // Converts a float within range 0.0 - 255 into 8 bit integer // static void convert_float_to_char(void) { if (float_value < 0.0) char_value = 0; else if (float_value >= 254.5) char_value = 255; else char_value = (unsigned char)(float_value + 0.5); } // ********************************************************************************************************************************* // // J U M P I N F U N C T I O N S // // ********************************************************************************************************************************* ////////////////////////////////////////////////////////////////////////////// // deco_calc_hauptroutine // // called from: divemode.asm // // Called two times per second during diving, updates the // tissues every second (i.e. on every second invocation). // // On each computation cycle: // - Updates deco table (char_O_deco_time/depth) with new values, // - updates ascent time, and // - sets status to zero (so we can check a cycle has finished). // void deco_calc_hauptroutine(void) { RESET_C_STACK calc_hauptroutine(); } ////////////////////////////////////////////////////////////////////////////// // deco_init_output_vars // // called from divemode.asm // // Initializes all output variables to their default values. // void deco_init_output_vars(void) { RESET_C_STACK init_output_vars(); } ////////////////////////////////////////////////////////////////////////////// // deco_clear_tissue // // called from: start.asm // menu_tree.asm // simulator.asm // // Sets all tissues to equilibrium with air at ambient pressure, // resets all CNS values, any warnings and resets all model output. // void deco_clear_tissue(void) { RESET_C_STACK clear_tissue(); } ////////////////////////////////////////////////////////////////////////////// // deco_calc_dive_interval // // called from: simulator.asm // // Updates tissues and CNS value for char_I_dive_interval minutes on air at // ambient pressure and calculates resulting saturation and ceiling for a // GF-high of 100% (ceiling and saturation not used by simulator.asm) // void deco_calc_dive_interval(void) { RESET_C_STACK calc_interval(char_I_dive_interval); } ////////////////////////////////////////////////////////////////////////////// // deco_calc_dive_interval_1min // // called from: start.asm // sleepmode.asm // surfmode.asm // menu_tree.asm // ghostwriter.asm // // Updates tissues and CNS value for 1 minute on air at ambient pressure and // calculates resulting saturation and ceiling for a GF-high of 100%. // void deco_calc_dive_interval_1min(void) { RESET_C_STACK calc_interval(1); } ////////////////////////////////////////////////////////////////////////////// // deco_calc_dive_interval_10min // // called from: sleepmode.asm // // Updates tissues and CNS value for 10 minutes on air at ambient pressure and // calculates resulting saturation and ceiling for a GF-high of 100%. // void deco_calc_dive_interval_10min(void) { RESET_C_STACK calc_interval(10); } ////////////////////////////////////////////////////////////////////////////// // deco_calc_desaturation_time // // called from: start.asm // surfmode.asm // menu_tree.asm // ghostwriter.asm // // Computes desaturation and no-fly times. // void deco_calc_desaturation_time(void) { RESET_C_STACK calc_desaturation_time(); } ////////////////////////////////////////////////////////////////////////////// // deco_push_tissues_to_vault // // called from: simulator.asm // // Makes a backup of the state of the real tissues and the deco engine. // void deco_push_tissues_to_vault(void) { RESET_C_STACK push_tissues_to_vault(); } ////////////////////////////////////////////////////////////////////////////// // deco_pull_tissues_from_vault // // called from: simulator.asm // ghostwriter.asm // // Restores the state of the real tissues and the deco engine from the backup. // void deco_pull_tissues_from_vault(void) { RESET_C_STACK pull_tissues_from_vault(); } // ********************************************************************************************************************************* // // M A I N F U N C T I O N S // // ********************************************************************************************************************************* ////////////////////////////////////////////////////////////////////////////// // Calculate the next deco stop // // INPUT, fixed during dive: // pres_surface : surface pressure (as absolute pressure) // char_I_depth_last_deco : depth of the last deco stop // // INPUT, may change during dive: // GF_high : GF high factor // GF_low : GF low factor // // INPUT & OUTPUT // char_depth_sim : simulated depth in meters // GF_low_depth : GF low depth in current calculation cycle // GF_slope : GF slope in current calculation cycle // GF_low_depth_norm/_alt : frozen GF low depth reference // GF_slope_norm/_alt : frozen GF slope // // OUTPUT // char_depth_last : depth we came from // sim_pres_respiration : simulated depth in absolute pressure // // RETURN // TRUE: a stop is needed, FALSE: no stop needed // static unsigned char find_next_stop(void) { overlay unsigned char depth_1min; overlay unsigned char depth_limit; overlay unsigned char stop_depth; overlay unsigned char next_stop; overlay unsigned char need_stop; // memorize the depth we came from char_depth_last = char_depth_sim; // calculate the ceiling (minimum relative pressure) for the current depth if( char_I_deco_model == 0 ) calc_limit(1.0); // deco or not - straight Buhlmann else if( NDL_time ) calc_limit(GF_high); // not in deco else if( char_depth_sim >= GF_low_depth ) calc_limit(GF_low); // in deco with GF, below or at low depth reference else calc_limit(GF_high - GF_slope * (float)char_depth_sim); // in deco with GF, above low depth reference // convert the ceiling from relative pressure to meters, // rounded up (i.e. made deeper) to next full meter, // limiting at surface. depth_limit = (ceiling > 0.0) ? (unsigned char)(ceiling * BAR_TO_METER + 0.99) : 0; // calculate the stop depth, i.e. round up (make deeper) to // the next multiple of 3 meters using integer arithmetics stop_depth = 3 * ( (depth_limit + 2) / 3 ); // apply correction for the shallowest stop if( stop_depth == 3 ) stop_depth = char_I_depth_last_deco; // compute depth in meters that will be reached in 1 minute of ascent // at a speed of char_I_ascent_speed (5..10 m/min) if( char_depth_sim > char_I_ascent_speed ) { depth_1min = char_depth_sim - char_I_ascent_speed; } else { depth_1min = 0; } // is the stop depth shallower than the depth that can be reached within 1 minute, // or are we allowed to surface AND can we reach the surface within 1 minute? if( ( ( stop_depth < depth_1min ) ) || ( ( stop_depth == 0 ) && ( depth_1min == 0 ) ) ) { // YES - report the depth that will be reached within 1 minute of ascent char_depth_sim = depth_1min; // - no stop needed need_stop = 0; // - done goto done; } // ----------------------------------------------------------------------- // we need to make a stop now, or need to stay at the current stop depth // ----------------------------------------------------------------------- // set stop data need_stop = 1; char_depth_sim = stop_depth; // Apply correction in case the stop is to be placed deeper than a // previously recorded stop for a gas change. This may happen because // the deco stops are placed at the next deeper multiple of 3 meters // instead of the real stop's depth. Correction is to relocate the // deco stop to the depth of the last gas change. The resulting combined // stop's duration will be the sum of the configured gas change time plus // the duration of the deco stop itself. if( 0 < internal_deco_depth[stop_index] ) if( char_depth_sim > internal_deco_depth[stop_index] ) char_depth_sim = internal_deco_depth[stop_index]; // done so far if using straight Buhlmann if( char_I_deco_model == 0 ) goto done; // ----------------------------------------------------------------------- // we need to make or hold a stop and we are using the GF extension // ----------------------------------------------------------------------- // is the stop depth deeper than the GF low depth reference used up to now? if( stop_depth > GF_low_depth ) { // YES - update the reference GF_low_depth = stop_depth; GF_slope = (GF_high - GF_low) / (float)GF_low_depth; // store for use in next cycles if( deco_status & CALC_NORM ) { GF_low_depth_norm = GF_low_depth; GF_slope_norm = GF_slope; } else { GF_low_depth_alt = GF_low_depth; GF_slope_alt = GF_slope; } } // We have a (first) stop. But with a steep GF slope, the stop(s) after this // first stop may be allowed to ascent to, too. This is because the gradient // factor that will be used at the next depth(s) will allow more tissue super- // saturation, maybe so much more that the next stop(s) will be allowed to // ascent to. So we have to probe the next stops that are within the reach of // 1 minute of ascent as well. // probe all stop depths that are in reach of 1 minute of ascent next_stop = stop_depth; while(next_stop > 0) { // compute the depth of the next stop ... if ( next_stop <= char_I_depth_last_deco ) next_stop = 0; else if ( next_stop == 6 ) next_stop = char_I_depth_last_deco; else next_stop -= 3; // would the next stop be beyond the 1 minute limit? if( next_stop < depth_1min ) { // YES - signal that probing is done next_stop = 0; } else { // NO - compute the ceiling at the next stop depth calc_limit(GF_high - GF_slope * (float)next_stop); // - limit ceiling to positive values, i.e. the surface if( ceiling < 0.0 ) ceiling = 0.0; // - check if this stop depth would be allowed if( next_stop >= (unsigned char)(ceiling * BAR_TO_METER + 0.99) ) { // YES - this stop depth is allowed char_depth_sim = next_stop; // - no stop needed if stop depth actually is the surface if( next_stop == 0 ) need_stop = 0; } } } // ----------------------------------------------------------------------- // common end for straight Buhlmann and Buhlmann with GF extension // ----------------------------------------------------------------------- done: // calculate absolute pressure at the depth found calc_sim_pres_respiration(); return need_stop; } ////////////////////////////////////////////////////////////////////////////// // Find current gas in the list and get its change depth // // Input: char_I_current_gas_num number of current gas (1..5 or 6) // // Output: sim_gas_current_num 1..6 or 0 for the manually configured gas/dil // sim_gas_current_depth change depth (MOD) of the gas/dil in meters // static void gas_take_current(void) { assert( 1 <= char_I_current_gas_num && char_I_current_gas_num <= 6 ); if( char_I_current_gas_num <= NUM_GAS ) // gas/diluent 1-5 { sim_gas_current_num = char_I_current_gas_num; sim_gas_current_depth = char_I_deco_gas_change[sim_gas_current_num-1]; // capture case of non-configured change depth if( sim_gas_current_depth == 0 ) sim_gas_current_depth = 255; } else { sim_gas_current_num = 0; sim_gas_current_depth = char_I_gas6_depth; } } ////////////////////////////////////////////////////////////////////////////// // Find the gas with the shallowest change depth below or at the current depth // // Input: char_depth_sim simulated depth in meters // sim_gas_current_num number of the currently used gas/dil // char_I_deco_gas_type[] types of the gases/dils // char_I_deco_gas_change[] change depths of the gases/dils // // Modified: sim_gas_best_num index of the gas (1..5) - only if return value is true // sim_gas_best_depth switch depth - only if return value is true // // Return value is TRUE if a better gas is available // static unsigned char gas_find_best(void) { overlay unsigned char switch_depth = 255; overlay unsigned char switch_gas = 0; overlay unsigned char j; // loop over all gases to find the shallowest one below or at current depth for( j = 0; j < NUM_GAS; ++j ) { // Is this gas available? if( char_I_deco_gas_type[j] > 0 ) // Is the change depth of the this gas deeper than or // at least equal to the current depth? if( char_I_deco_gas_change[j] >= char_depth_sim ) // Is the change depth of this gas shallower than or // at least equal to the change depth of the best gas // found so far, or is it the first better gas found? if( char_I_deco_gas_change[j] <= switch_depth ) #ifdef _gas_contingency // Is there still enough of this gas or doesn't it matter? if( ( gas_volume_need[j] < gas_volume_avail[j] ) || ( !char_I_gas_contingency ) ) #endif // If there is a yes to all these questions, we have a better gas! { // memorize this gas (1..5) and its change depth switch_gas = j+1; switch_depth = char_I_deco_gas_change[j]; } } // continue looping through all gases to eventually find an even better gas // has a best gas been found? if( switch_gas ) { // YES - export the best gas and its change depth sim_gas_best_num = switch_gas; sim_gas_best_depth = switch_depth; // is the best gas different from the current gas? if( sim_gas_best_num != sim_gas_current_num ) { // YES - signal advice for a gas change return 1; } } // no best gas found or current gas is the best gas return 0; } ////////////////////////////////////////////////////////////////////////////// // Switch to the best gas // // Input: sim_gas_best_num index of the best gas (1..5) // sim_gas_best_depth switch depth of the best gas // // Modified: sim_gas_current_num index of the new gas (1..5) // sim_gas_current_depth switch depth of the new gas // static void gas_take_best(void) { // set new gas sim_gas_current_num = sim_gas_best_num; sim_gas_current_depth = sim_gas_best_depth; } ////////////////////////////////////////////////////////////////////////////// // Set calc_N2/He/O2_ratios by sim_gas_current_num // // Input: sim_gas_current_num index of gas to use // real_O2_ratio, real_He_ratio if gas = 0 (the manually set gas) // char_I_deco_O2/He_ratio[] if gas = 1..5 (the configured gases) // // Output: sim_N2_ratio, sim_He_ratio ratios of the inert gases // sim_pSCR_drop ppO2 drop in pSCR loop // static void gas_set_ratios(void) { overlay float sim_IG_ratio; assert( 0 <= sim_gas_current_num <= NUM_GAS ); #ifdef _helium // get gas ratios if( sim_gas_current_num == 0 ) { sim_O2_ratio = real_O2_ratio; sim_He_ratio = real_He_ratio; } else { sim_O2_ratio = 0.01 * char_I_deco_O2_ratio[sim_gas_current_num-1]; sim_He_ratio = 0.01 * char_I_deco_He_ratio[sim_gas_current_num-1]; } // inert gas ratio (local helper variable) sim_IG_ratio = 1.00 - sim_O2_ratio; // N2 ratio sim_N2_ratio = sim_IG_ratio - sim_He_ratio; #else // get O2 ratio sim_O2_ratio = ( sim_gas_current_num == 0 ) ? real_O2_ratio : 0.01 * char_I_deco_O2_ratio[sim_gas_current_num-1]; // set H2 ratio to zero sim_He_ratio = 0.0; // inert gas ratio (local helper variable) sim_IG_ratio = 1.00 - sim_O2_ratio; // N2 ratio sim_N2_ratio = sim_IG_ratio; #endif #ifdef _ccr_pscr // ppO2 drop in pSCR loop sim_pSCR_drop = sim_IG_ratio * float_pSCR_factor; #endif assert( 0.0 <= sim_N2_ratio && sim_N2_ratio <= 0.95 ); assert( 0.0 <= sim_He_ratio && sim_He_ratio <= 0.95 ); assert( (sim_N2_ratio + sim_He_ratio) <= 0.95 ); } ////////////////////////////////////////////////////////////////////////////// // Compute respired ppO2, ppN2 and ppHe // // Input: tissue_increment : selector for targeting simulated or real tissues // main_status : breathing mode for real tissues // deco_status : breathing mode for simulated tissues // sim_/real_O2_ratio : (simulated) O2 ratio breathed // sim_/real_N2_ratio : (simulated) N2 ratio breathed // sim_/real_He_ratio : (simulated) He ratio breathed // sim_/real_pres_respiration : (simulated) respiration pressure [bar] // sim_/real_pSCR_drop : (simulated) pSCR O2 drop // pres_surface : surface pressure [bar] // char_I_const_ppO2 : ppO2 reported from sensors or setpoint [cbar] // float_deco_distance : safety factor, additional depth below stop depth [bar] - not used any more // ppWater : water-vapor pressure inside respiratory tract [bar] // // Output: ppN2 : respired N2 partial pressure // ppHe : respired He partial pressure // char_ppO2 : breathed ppO2 in %, used for CNS calculation // void calc_alveolar_pressures(void) { overlay float calc_pres_respiration; overlay float calc_O2_ratio; overlay float calc_N2_ratio; #ifdef _helium overlay float calc_He_ratio; #endif #ifdef _ccr_pscr overlay float calc_pSCR_drop; #endif overlay unsigned char status; assert( 0.00 <= real_N2_ratio && real_N2_ratio <= 1.00 ); assert( 0.00 <= real_He_ratio && real_He_ratio <= 1.00 ); assert( (real_N2_ratio + real_He_ratio) <= 1.00 ); assert( 0.800 < real_pres_respiration && real_pres_respiration < 14.0 ); assert( 0.00 <= sim_N2_ratio && real_N2_ratio <= 1.00 ); assert( 0.00 <= sim_He_ratio && real_He_ratio <= 1.00 ); assert( (sim_N2_ratio + sim_He_ratio) <= 1.00 ); assert( 0.800 < sim_pres_respiration && sim_pres_respiration < 14.0 ); // get input data according to context if( tissue_increment & TISSUE_SELECTOR ) { //---- real tissues ----------------------------------------------------------- calc_pres_respiration = real_pres_respiration; status = main_status; calc_O2_ratio = real_O2_ratio; calc_N2_ratio = real_N2_ratio; #ifdef _helium calc_He_ratio = real_He_ratio; #endif #ifdef _ccr_pscr calc_pSCR_drop = real_pSCR_drop; #endif } else { //---- simulated tissues ------------------------------------------------------ // correct sim_pres_respiration if shallower than calculated stop depth calc_pres_respiration = ( real_pres_respiration < sim_pres_respiration ) ? real_pres_respiration : sim_pres_respiration; // +++ pressure surcharge if outside deco stops area yet ??? status = deco_status; calc_O2_ratio = sim_O2_ratio; calc_N2_ratio = sim_N2_ratio; #ifdef _helium calc_He_ratio = sim_He_ratio; #endif #ifdef _ccr_pscr calc_pSCR_drop = sim_pSCR_drop; #endif } //---- OC, CCR and Bailout Mode Gas Calculations ----------------------------------- // calculate ppO2 of pure oxygen O2_ppO2 = calc_pres_respiration - ppWater; // capture failure condition in case real_pres_respiration is < ppWater (should never happen...) if( O2_ppO2 < 0.0 ) O2_ppO2 = 0.0; // calculate ppO2 of the pure gas (OC, diluent) OC_ppO2 = O2_ppO2 * calc_O2_ratio; #ifdef _ccr_pscr // calculate pSCR ppO2 pSCR_ppO2 = OC_ppO2 - calc_pSCR_drop; // capture failure condition in case pSCR_ppO2 becomes negative if( pSCR_ppO2 < 0.0 ) pSCR_ppO2 = 0.0; //---- Loop modes : adjust ppN2 and ppHe for change in ppO2 due to setpoint (CCR) or drop (pSCR) --- if( status & MODE_LOOP ) { overlay float const_ppO2; overlay float max_ppO2; // get the current sensor reading (CCR / pSCR if fitted) or the fixed setpoint (CCR) / a zero (pSCR) const_ppO2 = 0.01 * char_I_const_ppO2; // Limit the setpoint to the maximum physically possible ppO2. This prevents for // example calculating with a setpoint of 1.3 bar in only 2 meters of depth. // Additionally, the ppO2 can be further reduced to account for exhaled inert gases // accumulating in the loop by the user-adjustable setting char_I_CC_max_frac_O2. // (ppWater is neglected here) max_ppO2 = 0.01 * char_I_CC_max_frac_O2 * calc_pres_respiration; if( const_ppO2 > max_ppO2 ) const_ppO2 = max_ppO2; // check which kind of loop we are on if( status & MODE_PSCR ) { //---- pSCR Mode -------------------------------------------------------------------------- // Use the sensor value if available, but only in real tissue context! // In all other cases use calculated ppO2. if ( char_I_const_ppO2 && (tissue_increment & TISSUE_SELECTOR)) ppO2 = const_ppO2; else ppO2 = pSCR_ppO2; } else { //---- CCR Mode --------------------------------------------------------------------------- // derive breathed ppO2 from (char_I_)const_ppO2, which holds sensor reading or selected setpoint ppO2 = const_ppO2; } // adjust overall gas pressure for change in ppO2 due to setpoint (CCR) or drop (pSCR), // capture potential failure conditions first: if( ( calc_pres_respiration < ppO2 ) // sensor reading or selected setpoint is higher than ambient pressure || ( calc_O2_ratio > 0.995 ) ) // diluent is pure O2, i.e. calc_N2_ratio + calc_He_ratio = 0 would give a div/0 { // failure condition present, set predetermined result calc_pres_respiration = 0.0; } else { // no failure conditions present, equation can be executed calc_pres_respiration -= ppO2; #ifdef _helium calc_pres_respiration /= calc_N2_ratio + calc_He_ratio; #else calc_pres_respiration /= calc_N2_ratio; #endif } } else #endif // _ccr_pscr { //---- OC mode --------------------------------------------------------------------------------- // breathed ppO2 is ppO2 of pure gas ppO2 = OC_ppO2; } //---- derive char_ppO2 in [cbar], used for calculating CNS% --------------------------------------- if ( ppO2 < 0.01 ) char_ppO2 = 0; else if ( ppO2 >= 2.545 ) char_ppO2 = 255; else char_ppO2 = (unsigned char)(100 * ppO2 + 0.5); //---- calculate ppN2 and ppHe --------------------------------------------------------------------- // add deco safety distance when working on simulated tissues - not used any more // if( !(tissue_increment & TISSUE_SELECTOR) ) calc_pres_respiration += float_deco_distance; // compute ppN2 and ppHe, capture potential failure conditions first: if( calc_pres_respiration > ppWater ) { // subtract water vapor pressure calc_pres_respiration -= ppWater; // calculate partial pressures ppN2 = calc_N2_ratio * calc_pres_respiration; #ifdef _helium ppHe = calc_He_ratio * calc_pres_respiration; #else ppHe = 0.0; #endif } else { // calculated respired pressure is < water vapor pressure, thus set ppN2 and ppHe to 0 ppN2 = 0.0; ppHe = 0.0; } #ifdef _helium // calculating real tissues? if( tissue_increment & TISSUE_SELECTOR ) { overlay unsigned char temp; // compute gas density of current mix in multiples of 0.01 grams per liter int_O_gas_density = (unsigned int)( 17.9 * ppHe + 125.1 * ppN2 + 142.8 * ppO2 ); // convert gas density into a 8 bit integer temp = (unsigned char)( (int_O_gas_density + 9) / 10 ); // limit to display max and set warning or attention flag if( temp > 99 ) int_O_gas_density = 999 | INT_FLAG_WARNING; else if( temp > char_I_gas_density_warn ) int_O_gas_density |= INT_FLAG_WARNING; else if( temp > char_I_gas_density_att ) int_O_gas_density |= INT_FLAG_ATTENTION; } #endif } ////////////////////////////////////////////////////////////////////////////// // Initializes all output variables to their default values // static void init_output_vars(void) { // clear the internal stops table from remains lasting from the previous dive or deco calculator run clear_deco_table(); // publish the cleared stops table to the display functions publish_deco_table(); // clear the published gas needs in volume and pressure for( i = 0; i < NUM_GAS; ++i ) { int_O_gas_need_vol[i] = 0; int_O_gas_need_pres[i] = 0 + INT_FLAG_ZERO + INT_FLAG_INVALID; } // values initially to be set to zero int_O_ceiling = 0; // ceiling depth in mbar char_O_deco_info = 0; // clear all deco information flags char_O_deco_warnings = 0; // clear all deco warning flags // default desaturation time to 24 hours (it will not be computed during a dive) int_O_desaturation_time = 1440; // initialize CNS values int_O_CNS_norm = 0 + INT_FLAG_INVALID; int_O_CNS_alt = 0 + INT_FLAG_INVALID; // initialize NDL times char_O_NDL_norm = 240; char_O_NDL_alt = 240; // initialize ascent times int_O_TTS_norm = 0; int_O_TTS_alt = 0 + INT_FLAG_INVALID + INT_FLAG_NOT_COMPUTED_YET; #ifdef _rx_functions // clear TR values int_O_SAC_measured = 0 + INT_FLAG_NOT_AVAIL; // SAC rate int_O_pressure_need[0] = 0 + INT_FLAG_NOT_AVAIL; // pressure need to reading 1 int_O_pressure_need[1] = 0 + INT_FLAG_NOT_AVAIL; // pressure need to reading 2 int_O_tank_pressure = 0; // tank pressure for logging #endif #ifdef _helium int_O_gas_density = 0; #endif // also clear any time++ request char_I_sim_advance_time = 0; } ////////////////////////////////////////////////////////////////////////////// // Reset all tissues to surface pressure equilibrium state // // Input: int_I_pres_surface current surface pressure in hPa (mbar) // // Output: real_pres_tissue_N2[] partial pressure of N2 in real tissues // real_pres_tissue_He[] partial pressure of He in real tissues // char_O_tissue_pres_N2[] partial pressure of N2 for tissue graphics // char_O_tissue_pres_He[] partial pressure of He for tissue graphics // char_O_tissue_pressure[] total pressure for tissue graphics // CNS_fraction_real internal CNS value // int_O_CNS_current current CNS value // int_O_CNS_norm CNS value at end of normal dive plan // int_O_CNS_alt CNS value at end of alternative dive plan // char_O_deco_warnings deco warnings vector // char_O_NDL_norm remaining NDL time in normal dive plan // char_O_NDL_alt remaining NDL time in alternative dive plan // int_O_TTS_norm ascent time (TTS) in normal dive plan // int_O_TTS_alt ascent time (TTS) in alternative dive plan // int_O_lead_supersat supersaturation of the leading tissue // static void clear_tissue(void) { // safeguard and convert the surface pressure (mbar -> bar) (*) if( int_I_pres_surface < 500 ) pres_surface = 0.500; else pres_surface = 0.001 * int_I_pres_surface; // calculate partial pressure of N2 in respired air at surface pressure calc_N2_equilibrium(); // cycle through the 16 Buhlmann tissues for( ci = 0; ci < NUM_COMP; ci++ ) { // reset tissue pressures real_pres_tissue_He[ci] = 0.0; // He real_pres_tissue_N2[ci] = N2_equilibrium; // N2 // reset tissue pressures for scaled for tissue graphics char_O_tissue_pres_He[ci] = 0; // He char_O_tissue_pres_N2[ci] = 10; // N2 char_O_tissue_pressure[ci] = 10; // combined } // reset CNS values CNS_fraction_real = 0.0; int_O_CNS_current = int_O_CNS_norm = int_O_CNS_alt = 0; // reset some more vars to their defaults char_O_NDL_norm = 240; char_O_NDL_alt = 240; int_O_TTS_norm = 0; int_O_TTS_alt = 0; int_O_lead_supersat = 0; // reset all warning and info flags char_O_deco_warnings = 0; char_O_deco_info = 0; } ////////////////////////////////////////////////////////////////////////////// // Deco engine main code // // This is the major code in dive mode, it calculates the tissue pressures, // the bottom time, and it calculates the ascend with all deco stops, etc. // // Input: char_O_main_status deco engine control and real tissues mode // char_O_deco_status deco engine control and simulated tissues mode // char_I_sim_advance_time mailbox for bottom time incrementing // // char_I_SAC_work gas usage rate during working phase in l/min // char_I_SAC_deco gas usage rate during deco stops phase in l/min // // char_I_deco_model selector for GF extension // char_I_ascent_speed ascent speed // char_I_saturation_multiplier safety factor for tissue saturation // char_I_desaturation_multiplier safety factor for tissue desaturation // // char_I_pressure_gas[] amount of gas available for ascent in bar // int_I_pressure_drop[] pressure drop used to calculate SAC rate // char_I_gas_avail_size[] size of the tanks in liters // // Output: int_O_O2_ppO2 partial pressure of pure O2 at current depth // int_O_pure_ppO2 partial pressure of O2 in gas at current depth // int_O_pSCR_ppO2 partial pressure of O2 in gas at current depth, corrected for pSCR mode // int_O_breathed_ppO2 partial pressure of O2 currently breathed // // char_O_deco_status deco engine computations status // char_O_deco_info deco engine information vector // char_O_deco_warnings deco engine warnings vector // // char_O_NDL_norm remaining NDL time in normal dive plan // char_O_NDL_alt remaining NDL time in alternative dive plan // int_O_TTS_norm ascent time (TTS) in normal dive plan // int_O_TTS_alt ascent time (TTS) in alternative dive plan // int_O_CNS_norm CNS value at end of normal dive plan // int_O_CNS_alt CNS value at end of alternative dive plan // // int_O_gas_need_vol calculated gas volumes needed for ascent // int_O_gas_need_pres calculated gas pressures needed for ascent // // int_O_SAC_measured measured surface air consumption (SAC) rate in l/min // // Modified: int_IO_pressure_value[] warning flags added to pressure reading 1 & 2 // int_IO_pressure_need[] pressure needs to pressure reading 1 & 2 // static void calc_hauptroutine(void) { overlay unsigned short int_ppO2_min; overlay unsigned short int_ppO2_max_warn; overlay unsigned short int_ppO2_max_att; overlay unsigned short int_ppO2_max_dil; overlay float EAD; overlay float END; //============================================================================================= // //--- Setup Part --------------------------------------------------------------------------------- // // set time limit for preempting deco calculations, timer is 16 bit and increments every 1/32 ms tmr5_value = 65535 - (32 * BUDGET_PER_SECOND / INVOKES_PER_SECOND); // load timer load_tmr5(); // read command flags and set up what to do switch( char_O_deco_status & COMMAND_MASK ) { case INITIALIZE: case INITIALIZE_START_NORM: case INITIALIZE_START_ALT: // copy master modes to shadow registers main_status = char_O_main_status; deco_status = char_O_deco_status; // clear all command flags on the master mode to signal that the command is read char_O_deco_status &= ~COMMAND_MASK; // clear the initialization flag on the shadow copy deco_status &= ~INITIALIZE; // initialize the sequence timer sequence_timer = 0; // set the calculation phase to start with to doing the once-per-dive initialization next_planning_phase = PHASE_10_DIVE_INIT; break; case START_NORM: case START_ALT: // copy master modes to shadow registers main_status = char_O_main_status; deco_status = char_O_deco_status; // clear all command flags on the master mode to signal that the command is read char_O_deco_status &= ~COMMAND_MASK; // set the calculation phase to start with to doing the cyclic initialization next_planning_phase = PHASE_20_CYCLIC_INIT; // continue in CALCULATING case CALCULATING: // keep current calculation phase // step the sequence timer sequence_timer = (sequence_timer < INVOKES_PER_SECOND * 2 - 1) ? sequence_timer + 1 : 0; break; } // //--- End of Setup Part ----------------------------------------------------------------------- // //============================================================================================= // //---- Calculations Part (real Tissues) ------------------------------------------------------- // // target the real tissues with 2 second increments by default tissue_increment = TISSUE_SELECTOR | 0; // Tasks every second, if more than 1 invocation per second: on the first section of the second. // Requests for tissue "fast forward" are executed immediately. #if (INVOKES_PER_SECOND > 1) if( ( sequence_timer == 0 ) || ( sequence_timer == INVOKES_PER_SECOND ) || ( char_I_sim_advance_time > 0 ) ) #endif { // acquire current environmental data calc_hauptroutine_data_input(); // calculate ppO2, ppN2 and ppHe for real tissues calc_alveolar_pressures(); // add decent calculation here and include trigger in above if-statement // TODO } // tasks every second, on the first section of the second // Tasks every 2 seconds, on the first section of the respective second. // Requests for tissue "fast forward" are executed immediately. if( ( sequence_timer == 0 ) || ( char_I_sim_advance_time > 0 ) ) { // Tissue and CNS updates are based on 2 seconds periods! // Set up normal tissue updating or "fast forward" updating for simulator // sim+5' function and deco calculator bottom time calculation. if( char_I_sim_advance_time > 0 ) { // configure "fast forward" tissue updating tissue_increment = TISSUE_SELECTOR | char_I_sim_advance_time; // clear the request char_I_sim_advance_time = 0; } // calculate the real tissues calc_tissues(); // update the CNS value for the real tissues calc_CNS(); // calculate ceiling (at GF_high or 100%) and leading tissue supersaturation if ( char_I_deco_model ) calc_limit(GF_high); // GF factors enabled else calc_limit( 1.0 ); // classic Buhlmann // convert the ceiling value to integer convert_ceiling_for_display(); // convert the saturation value of the leading tissue to integer convert_sat_for_display(); // convert the CNS value to integer convert_cur_CNS_for_display(); } // tasks every 2 seconds // Tasks every second, if more than 1 invocation per second: on the first section of the second. #if (INVOKES_PER_SECOND > 1) if( ( sequence_timer == 0 ) || ( sequence_timer == INVOKES_PER_SECOND ) ) #endif { //---- Calculate and Export EAD and END ------------------------------------------------------ // calculate EAD (Equivalent Air Depth): equivalent depth for the same N2 level with plain air EAD = (ppN2 / 0.7902 + ppWater - pres_surface) * BAR_TO_METER; // calculate END (Equivalent Narcotic Depth): here O2 is treated as narcotic, too // Source cited: The Physiology and Medicine of Diving by Peter Bennett and David Elliott, // 4th edition, 1993, W.B.Saunders Company Ltd, London. END = (real_pres_respiration - ppHe - pres_surface) * BAR_TO_METER; // export EAD float_value = EAD; convert_float_to_char(); char_O_EAD = char_value; // export END float_value = END; convert_float_to_char(); char_O_END = char_value; //---- Compute ppO2 Values in [cbar] --------------------------------------------------------- float_value = ppO2; convert_float_to_int(); int_O_breathed_ppO2 = int_value; // breathed gas #ifdef _ccr_pscr float_value = O2_ppO2; convert_float_to_int(); int_O_O2_ppO2 = int_value; // pure oxygen float_value = OC_ppO2; convert_float_to_int(); int_O_pure_ppO2 = int_value; // pure gas float_value = pSCR_ppO2; convert_float_to_int(); int_O_pSCR_ppO2 = int_value; // pSCR calculated #endif //---- Set/Clear Deco Mode ------------------------------------------------------------------ // Clear the deco mode flag if: // deco mode is set // AND we are deeper than 7 meters below the deepest deco stop // (7 meters chosen as to be 2 stop depth intervals plus 1 additional meter below) if ( ( deco_info & DECO_MODE ) > 0 ) if ( ( char_depth_real ) > char_O_deco_depth[0] + 7 ) deco_info &= ~DECO_MODE; // Set the deco mode flag if: // deco mode is not set // AND breathing an OC deco gas (gas type 3) // OR breathing a gas or diluent that officially is disabled (type 0) // OR there is a deco stop if ( ( deco_info & DECO_MODE ) == 0 ) if ( ( char_I_current_gas_type == 3 ) || ( char_I_current_gas_type == 0 ) || ( char_O_deco_depth[0] > 0 ) ) deco_info |= DECO_MODE; //---- Compute ppO2 Warnings ------------------------------------------------------------------ // compute conditional min value #ifdef _ccr_pscr int_ppO2_min = ( main_status & MODE_LOOP ) ? (unsigned short)char_I_ppO2_min_loop : (unsigned short)char_I_ppO2_min; #else int_ppO2_min = (unsigned short)char_I_ppO2_min; #endif // determine the absolute max value (should be the deco one, but who knows...) int_ppO2_max_warn = ( char_I_ppO2_max_work > char_I_ppO2_max_deco) ? char_I_ppO2_max_work : char_I_ppO2_max_deco; // add some margin to compensate for surface pressures > 1.000 mbar int_ppO2_max_warn += ppO2_MARGIN_ON_MAX; // determine the normal max value int_ppO2_max_att = ( deco_info & DECO_MODE ) ? (unsigned short)char_I_ppO2_max_deco : (unsigned short)char_I_ppO2_max_work; // add some margin to compensate for surface pressures > 1.000 mbar int_ppO2_max_att += ppO2_MARGIN_ON_MAX; #ifdef _ccr_pscr // default value for the upper diluent ppO2 warning threshold is the upper warning threshold int_ppO2_max_dil = int_ppO2_max_warn; // when enabled and in CCR mode, the upper diluent warning threshold gets adjust according to the current setpoint if( char_I_dil_ppO2_check ) if( (main_status & MODE_MASK) == MODE_CCR ) { overlay unsigned short max_dil; // The upper diluent ppO2 threshold is ppO2_GAP_TO_SETPOINT below the setpoint... // (the condition protects from negative numbers which would cause a wrap-around in unsigned integers) max_dil = (char_I_const_ppO2 > ppO2_GAP_TO_SETPOINT) ? (unsigned short)(char_I_const_ppO2 - ppO2_GAP_TO_SETPOINT) : 0; // ...but never above int_ppO2_max_warn if( max_dil < int_ppO2_max_warn ) int_ppO2_max_dil = max_dil; // We do not need to guard int_ppO2_max_dil against becoming lower than char_I_ppO2_min because the check // against char_I_ppO2_min is done first and will then raise a low warning and inhibit further checks. } #endif // check for safe range of breathed gas if ( int_O_breathed_ppO2 <= int_ppO2_min ) int_O_breathed_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; else if ( int_O_breathed_ppO2 >= int_ppO2_max_warn ) int_O_breathed_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; else if ( deco_info & DECO_MODE ) ; // no attention generated in deco mode else if ( main_status & MODE_LOOP ) ; // no attention generated in loop modes else if ( int_O_breathed_ppO2 >= int_ppO2_max_att ) int_O_breathed_ppO2 |= INT_FLAG_ATTENTION; #ifdef _ccr_pscr // check for safe range of pure oxygen if ( int_O_O2_ppO2 >= int_ppO2_max_warn ) int_O_O2_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; // check for safe range of pure diluent if ( int_O_pure_ppO2 <= (unsigned short)char_I_ppO2_min ) int_O_pure_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; else if ( int_O_pure_ppO2 >= int_ppO2_max_warn ) int_O_pure_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; else if ( int_O_pure_ppO2 >= int_ppO2_max_dil ) int_O_pure_ppO2 |= INT_FLAG_ATTENTION; // check for safe range of calculated pSCR loop gas if ( int_O_pSCR_ppO2 <= int_ppO2_min ) int_O_pSCR_ppO2 |= INT_FLAG_WARNING + INT_FLAG_LOW; else if ( int_O_pSCR_ppO2 >= int_ppO2_max_warn ) int_O_pSCR_ppO2 |= INT_FLAG_WARNING + INT_FLAG_HIGH; #endif } // tasks every second / on the first section of the second #ifdef _rx_functions // only when TR functions are enabled if( main_status & TR_FUNCTIONS ) // Tasks every second, if more than 1 invocation per second: on the second section of the second. #if (INVOKES_PER_SECOND > 1) if( ( sequence_timer == 1 ) || ( sequence_timer == INVOKES_PER_SECOND + 1 ) ) #endif { calc_TR_functions(); } #endif // _rx_functions // //---- End of Computations for the real Tissues ----------------------------------------------- // //============================================================================================= // //---- Begin of Computations for Ascent and Decompression (simulated Tissues) ----------------- // // Dispatcher: select what to do based on the current calculation phase do { #ifdef _profiling profiling_phase = next_planning_phase; #endif switch( next_planning_phase ) { // //---- once-per-dive Initialization of the Deco Engine ------------------------------------ // case PHASE_10_DIVE_INIT: // initialize all output variables to defaults init_output_vars(); // safeguard input parameters that are constant during the course of the dive if( char_I_ascent_speed < 5 ) char_I_ascent_speed = 5; if( char_I_ascent_speed > 10 ) char_I_ascent_speed = 10; // convert input parameters to float numbers float_ascent_speed = 1.00 * char_I_ascent_speed; // initialize values that will be recalculated later on periodically deco_warnings = 0; // reset all deco warnings deco_info = 0; // reset all deco infos IBCD_tissue_vector = 0; // reset tissue IBCD vector NDL_tissue_start_norm = 0; // initialize the tissue to start with when calculating normal NDL time NDL_tissue_start_alt = 0; // initialize the tissue to start with when calculating alternative NDL time // enforce initialization of GF data on first cyclic initialization GF_high_last = 255; GF_low_last = 255; #ifdef _gas_contingency // shall check for gas pan out? if( char_I_gas_contingency ) { overlay float reduction = 0.5 * (float)char_I_SAC_deco * (1.0 + (float)char_I_depth_last_deco / 10.0); // YES - calculate volumes available for each gas for( i = 0; i < NUM_GAS; i++ ) { // total available volume = tank size * fill press, char_I_gas_avail_pres is in multiples of 10 bar gas_volume_avail[i] = (float)char_I_gas_avail_size[i] * (float)char_I_gas_avail_pres[i] * 10.0; // reduce total available volumes by due for 1/2 minute on last stop gas_volume_avail[i] -= reduction; } } #endif #ifdef _cave_mode char_I_backtrack_time = 0; //clear backtracking time (index to char_I_backtrack_depth) char_I_backtrack_depth = 0; //prime first entry with a depth of 0 meter #endif #ifdef _profiling int_O_profiling_overrun_max = 0; char_O_profiling_runs_norm = 0; char_O_profiling_runs_alt = 0; #endif // the next calculation phase will do the cyclic initialization of the deco engine if a // normal or alternative plan shall be calculated, else the calculation cycle is done. if( deco_status & PLAN_MASK ) next_planning_phase = PHASE_20_CYCLIC_INIT; else next_planning_phase = PHASE_00_DONE; break; // //---- once-per-cycle Initialization of the Deco Engine ----------------------------------- // case PHASE_20_CYCLIC_INIT: // target the simulated tissues (flag bit 7 = 0) tissue_increment = 0; // clear the internal stops table clear_deco_table(); // initialize the simulated tissues with the current state of the real tissues for( i = 0; i < NUM_COMP; i++ ) { sim_pres_tissue_N2[i] = real_pres_tissue_N2[i]; sim_pres_tissue_He[i] = real_pres_tissue_He[i]; } // initialize GF parameters if using GF model if( char_I_deco_model != 0 ) { // update GF parameters (GFs may have been switched between GF and aGF) if( (char_I_GF_Low_percentage != GF_low_last) || (char_I_GF_High_percentage != GF_high_last) ) { // store new values in integer format GF_low_last = char_I_GF_Low_percentage; GF_high_last = char_I_GF_High_percentage; // safeguard and store new values in float format GF_low = ( GF_low_last > 10 ) ? 0.01 * GF_low_last : 0.10 ; GF_high = ( GF_high_last > GF_low_last ) ? 0.01 * GF_high_last : GF_low; // reset low depth references and slopes GF_low_depth_norm = 0; GF_low_depth_alt = 0; GF_slope_norm = 0.0; GF_slope_alt = 0.0; } // retrieve GF parameters for current calculation cycle if( deco_status & CALC_NORM ) { GF_low_depth = GF_low_depth_norm; GF_slope = GF_slope_norm; } else { GF_low_depth = GF_low_depth_alt; GF_slope = GF_slope_alt; } } // initialize the simulated CNS value with the current CNS value of the real tissues CNS_fraction_sim = CNS_fraction_real; // initialize the simulated depth with the current depth, // memorize current depth as start depth of the simulation sim_pres_respiration = real_pres_respiration; char_depth_sim = char_depth_real; char_depth_sim_start = char_depth_real; // Lookup the gas that is currently breathed with the real tissues and set it as // the gas to be used with the simulated tissues, too. This gas will be used until // gas_find_best()/gas_take_best() is invoked and switches to a better gas. gas_take_current(); // Setup the calculation ratio's for N2, He and O2 (sim_N2/He/_O2_ratio). // These ratios can be kept until a gas switch is done. Thus, if a call to // gas_find_best() has found a better gas and this gas is taken by a call // to gas_take_best(), gas_set_ratios() needs to be called again. gas_set_ratios(); // compute ppO2, ppN2 and ppHe for current depth from sim_pres_respiration calc_alveolar_pressures(); // initialize the no decompression limit (NDL) time to 240 minutes NDL_time = 240; // initialize the total ascent time to 0 minutes ascent_time = 0; // retrieve the tissue that had the shortest NDL time during last calculation NDL_tissue_start = ( deco_status & CALC_NORM ) ? NDL_tissue_start_norm : NDL_tissue_start_alt; // start calculating NDL time with the tissue that had the shortest NDL last time NDL_tissue = NDL_tissue_start; NDL_tissue_lead = NDL_tissue_start; // initialization for calculating the initial ascent // start with 1 minute ascent steps when calculating the initial ascent fast = 1; // initialization for convert_gas_needs_to_press() gas_needs_gas_index = 0; // shall calculate gas needs? if( main_status & CALC_VOLUME ) { // set the usage rate (SAC rate), starting with working part of the dive gas_needs_usage_rate = char_I_SAC_work; // clear the gas volume needs for gases 1-5 for( i = 0; i < NUM_GAS; ++i ) gas_volume_need[i] = 0.0; #ifdef _rx_functions // only for OSTC TR model with TR functions enabled if( main_status & TR_FUNCTIONS ) { // invalidate pressure needs to pressure readings int_O_pressure_need[0] = 0 + INT_FLAG_NOT_AVAIL; int_O_pressure_need[1] = 0 + INT_FLAG_NOT_AVAIL; } #endif } #ifdef _profiling profiling_runs = 0; #endif // The next calculation phase will // - calculate the extended bottom segment if extended bottom time is configured (fTTS), // - calculate the bottom segment gas need if gas needs calculation is configured, // - proceed with calculating the NDL time else. if ( deco_status & DELAYED_ASCENT ) next_planning_phase = PHASE_30_EXTENDED_BOTTOM_TIME; else if ( main_status & CALC_VOLUME ) next_planning_phase = PHASE_40_BOTTOM_GAS_NEED; else next_planning_phase = PHASE_50_NDL_TIME; break; // //---- extended Bottom Time --------------------------------------------------------------- // case PHASE_30_EXTENDED_BOTTOM_TIME: // program interval on simulated tissues (flag bit 7 = 0) tissue_increment = char_I_extra_time; // update the simulated tissues for tissue_increment (char_I_extra_time) minutes at depth, // calc_alveolar_pressures() has already been called in cyclic initialization calc_tissues(); // update the CNS value for tissue_increment (char_I_extra_time) minutes at depth calc_CNS(); // the next calculation phase will // - calculate the extended bottom segment gas needs if gas needs calculation is configured, // - proceed with calculating the NDL time else. if ( main_status & CALC_VOLUME ) next_planning_phase = PHASE_40_BOTTOM_GAS_NEED; else next_planning_phase = PHASE_50_NDL_TIME; break; // //---- Bottom Segment Gas Need ------------------------------------------------------------ // case PHASE_40_BOTTOM_GAS_NEED: // on gas 1-5 ? if( sim_gas_current_num ) { // YES - set the bottom depth gas_needs_depth = char_depth_sim_start; // take either the whole bottom time or just the fTTS/bailout extra time gas_needs_time = ( main_status & CALCULATE_BOTTOM ) ? char_I_bottom_time : char_I_extra_time; // calculate gas demand calc_due_by_depth_time_sac(); // take the result gas_volume_need[sim_gas_current_num-1] = gas_needs_volume_due; } // the next calculation phase will calculate the NDL time next_planning_phase = PHASE_50_NDL_TIME; break; // //---- NDL Time --------------------------------------------------------------------------- // case PHASE_50_NDL_TIME: // Calculate the remaining no decompression limit (NDL) time for the tissue NDL_tissue. // NDL_time will be updated if the NDL time found is shorter than the current NDL_time. // // In the initialization phase of the calculation cycle: // - NDL_time had been initialized to 240 (minutes), // - NDL_tissue had been initialized to the tissue with // the shortest NDL time in the last cycle. // calc_NDL_time_tissue(); // advance to next tissue, wrapping around after last tissue NDL_tissue = (NDL_tissue + 1) & (NUM_COMP - 1); // did we run out of NDL time or did we have probed all tissues? if( (NDL_time == 0) || (NDL_tissue == NDL_tissue_start) ) { // YES // set the tissue with the shortest NDL time found as // the one to start with in the next calculation cycle if( deco_status & CALC_NORM ) NDL_tissue_start_norm = NDL_tissue_lead; else NDL_tissue_start_alt = NDL_tissue_lead; // done with calculating NDL time, set next calculation phase: // - calculate return and ascent in cave mode if configured, else // - proceed with no-stop ascent if within NDL time, or // - proceed with deco ascent if beyond NDL time. #ifdef _cave_mode if ( main_status & CAVE_MODE ) next_planning_phase = PHASE_60_CAVE_RETURN; else #endif next_planning_phase = PHASE_70_OPEN_WATER_ASCENT; } break; #ifdef _cave_mode // //---- Cave Mode Return ------------------------------------------------------------------- // case PHASE_60_CAVE_RETURN: // TODO // the next calculation phase will gather all results next_planning_phase = PHASE_80_RESULTS; break; #endif // //---- Open Water Ascent ------------------------------------------------------------------ // case PHASE_70_OPEN_WATER_ASCENT: // program 1 minute interval on simulated tissues tissue_increment = 1; // memorize current gas in case there will be a gas change sim_gas_last_num = sim_gas_current_num; // find_next_stop(): // stays at the current stop depth, ascents to the next stop depth, or // ascents to the depth that is reachable within one minute of ascent // without needing to stop. // // return value : 1/true if a stop is required, else 0/false // char_depth_sim : current depth (depth achieved) // char_depth_last : last depth (depth we came from) // if( find_next_stop() ) { overlay unsigned char silent_stop = 0; overlay unsigned char gas_change = 0; //---- stop required -------------------- // check if there is a better gas to switch to if( gas_find_best() ) { // YES - memorize it gas_change = 1; // take the gas gas_take_best(); // set the new calculation ratios for N2, He and O2 gas_set_ratios(); // add the gas change time to the stop time tissue_increment += char_I_gas_change_time; // extended stops option enabled and // gas change depth deeper than the current depth ? if( main_status & EXTENDED_STOPS ) if( sim_gas_current_depth > char_depth_sim ) { // YES - make a "silent" stop at the gas change depth // to figure in the gas change silent_stop = 1; // locate the stop at the shallower one of the // gas change depth or the depth we came from char_depth_sim = (sim_gas_current_depth < char_depth_last) ? sim_gas_current_depth : char_depth_last; // calculate sim_pres_respiration for // the adjusted value of char_depth_sim calc_sim_pres_respiration(); // as we didn't travel the full distance, // account for the gas change time only tissue_increment = char_I_gas_change_time; // if run from the deco calculator, // put the gas change into the stops table or // abort deco calculation if the table is full if( deco_status & DECO_CALCULATOR_MODE ) if( !update_deco_table(tissue_increment) ) next_planning_phase = PHASE_80_RESULTS; } } // better gas // if the stop is not a silent one, // add the stop to an existing stop or add a new stop, // or abort deco calculation if the deco table is full if( !silent_stop ) if( !update_deco_table(tissue_increment) ) next_planning_phase = PHASE_80_RESULTS; // shall calculate gas needs? if( main_status & CALC_VOLUME ) { // encountered a stop, so switch to deco usage rate (SAC deco) gas_needs_usage_rate = char_I_SAC_deco; // set the depth for gas need calculation to the shallower one // of the start depth (current real depth) and the stop depth // (assumed depth to be) as we may be shallower than we should be gas_needs_depth = ( char_depth_sim_start < char_depth_sim ) ? char_depth_sim_start : char_depth_sim; // did a gas change occur and last gas is 1-5 and a gas change time set? if( gas_change && sim_gas_last_num && char_I_gas_change_time ) { // YES - set time it takes for switching the gas gas_needs_time = char_I_gas_change_time; // calculate gas demand calc_due_by_depth_time_sac(); // add the demand to the overall demand on the last gas gas_volume_need[sim_gas_last_num-1] += gas_needs_volume_due; } // current gas is 1-5 ? if( sim_gas_current_num ) { // YES - time is 1 minute plus the gas change time (if set) gas_needs_time = tissue_increment; // calculate gas demand calc_due_by_depth_time_sac(); // add the demand to the overall demand on the current gas gas_volume_need[sim_gas_current_num-1] += gas_needs_volume_due; } } // gas need } else { //---- no stop required ----------------- // switch to a better gas, but only: // // if extended stops are activated OR if in bailout OR if within NDL // AND if the actual depth is below (deeper) or at the change depth of the // better gas (switch depth has not been passed yet) // AND if the depth of the last stop is above (shallower) or at the change // depth of the better gas (do not switch on final ascent) // // Attention: do not use a && formula over all 'if' terms, the // conditions need to be evaluated in the given order! // if( (main_status & EXTENDED_STOPS) || (deco_status & BAILOUT_MODE) || NDL_time ) if( gas_find_best() ) if( char_depth_real >= sim_gas_best_depth ) if( char_I_depth_last_deco <= sim_gas_best_depth ) { // YES - take the gas gas_take_best(); // set the new calculation values for N2, He and O2 gas_set_ratios(); // set char_depth_sim to the gas change depth char_depth_sim = sim_gas_current_depth; // calculate sim_pres_respiration for // the adjusted value of char_depth_sim calc_sim_pres_respiration(); // as we didn't travel the full distance, // account for the gas change time only tissue_increment = char_I_gas_change_time; // if in deco and // if run from the deco calculator: // create a stop for the gas change in the stops table, // abort deco calculation if the deco table is full if( !NDL_time ) if( deco_status & DECO_CALCULATOR_MODE ) if( !update_deco_table(tissue_increment) ) next_planning_phase = PHASE_80_RESULTS; // shall calculate gas needs and gas change time is set? if( main_status & CALC_VOLUME ) if( char_I_gas_change_time ) { // YES - set depth to current depth gas_needs_depth = char_depth_sim; // set time it takes for switching the gas gas_needs_time = tissue_increment; // calculate gas demand calc_due_by_depth_time_sac(); // add gas demand to the overall demand on the new gas gas_volume_need[sim_gas_current_num-1] += gas_needs_volume_due; // was the last gas one of the gases 1-5 ? if( sim_gas_last_num ) { // YES - add the same demand to the overall demand on the last gas gas_volume_need[sim_gas_last_num-1] += gas_needs_volume_due; } } // gas switching needs } // gas switch // shall calculate gas needs and // last (or still current) gas is 1-5 ? if( main_status & CALC_VOLUME ) if( sim_gas_last_num ) { // YES - compute distance traveled gas_needs_depth = char_depth_last - char_depth_sim; // at least some positive distance traveled? if( gas_needs_depth > 1 ) { // YES - set depth to average depth along the distance gas_needs_depth += 1; gas_needs_depth /= 2; gas_needs_depth += char_depth_sim; // ascent time is 1 minute gas_needs_time = 1; // calculate gas demand calc_due_by_depth_time_sac(); // add to overall demand gas_volume_need[sim_gas_last_num-1] += gas_needs_volume_due; } } // gas travel needs } // stop / no stop // --- one or more minutes have passed by now --- // update the ascent time ascent_time += tissue_increment; // compute current ppO2, ppN2 and ppHe calc_alveolar_pressures(); // update the tissues calc_tissues(); // update the CNS value calc_CNS(); // finish stops calculation if the surface is reached if( char_depth_sim == 0 ) next_planning_phase = PHASE_80_RESULTS; break; /// //--- Results - Initialization ------------------------------------------------------------ // case PHASE_80_RESULTS: // convert the CNS value to integer convert_sim_CNS_for_display(); if( deco_status & CALC_NORM ) { // export the integer CNS value int_O_CNS_norm = int_sim_CNS_fraction; } else { // export the integer CNS value int_O_CNS_alt = int_sim_CNS_fraction; } // The next calculation phase will // - publish the stops table if in normal plan mode, // - proceed with remaining results dependent on if within NDL, or // - in deco if ( deco_status & CALC_NORM ) next_planning_phase = PHASE_81_RESULTS_STOPS_TABLE; else if ( NDL_time ) next_planning_phase = PHASE_82_RESULTS_NDL; else next_planning_phase = PHASE_83_RESULTS_DECO; break; /// //--- Publish Stops Table ----------------------------------------------------------------- // case PHASE_81_RESULTS_STOPS_TABLE: // publish the stops table to the display functions publish_deco_table(); // When entering deco and the ceiling depth becomes > 0 but the // deco calculation reveals no distinct deco stop yet because // the deco obligation will vanish during the ascent, create an // artificial stop to signal that expedite surfacing ("popping // up") is not allowed anymore. if( char_O_deco_depth[0] == 0 ) // simulated ascent reveals no required stops if( int_O_ceiling > 0 ) // real tissues have a ceiling { // set a pro forma stop at the configured last stop depth char_O_deco_depth[0] = char_I_depth_last_deco; // set a stop time of 0 minutes, this will be displayed as "..'" char_O_deco_time[0] = 0; } // update deco info vector if( char_O_deco_depth[0] ) deco_info |= DECO_STOPS; // set flag for deco stops found else deco_info &= ~DECO_STOPS; // clear flag for deco stops found // The next calculation phase will publish the main results dependent on being // - within NDL, // - in deco. if ( NDL_time ) next_planning_phase = PHASE_82_RESULTS_NDL; else next_planning_phase = PHASE_83_RESULTS_DECO; break; /// //--- Results - within NDL ---------------------------------------------------------------- // case PHASE_82_RESULTS_NDL: // results to publish depend on normal or alternative plan if( deco_status & CALC_NORM ) { // output the NDL time char_O_NDL_norm = NDL_time; // clear the normal ascent time int_O_TTS_norm = 0; } else { // output the NDL time char_O_NDL_alt = NDL_time; // clear the alternative ascent time int_O_TTS_alt = 0; } // The next calculation phase will // - finish the calculation cycle if no gas needs calculation configured, else // - calculate the gas needs pressures if ( !(main_status & CALC_VOLUME ) ) next_planning_phase = PHASE_90_FINISH; else next_planning_phase = PHASE_84_GAS_NEEDS_PRESSURES; break; /// //--- Results - in Deco ------------------------------------------------------------------- // case PHASE_83_RESULTS_DECO: // limit ascent time to display max. if( ascent_time > 999) ascent_time = 999; // tag ascent time as invalid if there is an overflow in the stops table if( deco_warnings & DECO_WARNING_INCOMPLETE ) ascent_time |= INT_FLAG_INVALID; // results to publish depend on normal or alternative plan if( deco_status & CALC_NORM ) { // clear the normal NDL time char_O_NDL_norm = 0; // export the ascent time int_O_TTS_norm = ascent_time; } else { // clear the alternative NDL time char_O_NDL_alt = 0; // export the ascent time int_O_TTS_alt = ascent_time; } // The next calculation phase will // - finish the calculation cycle if no gas needs calculation configured, else // - calculate the gas needs along the ascent if ( !(main_status & CALC_VOLUME ) ) next_planning_phase = PHASE_90_FINISH; else next_planning_phase = PHASE_84_GAS_NEEDS_PRESSURES; break; // //--- Results - convert Gas Needs Volumes to Pressures ------------------------------------ // case PHASE_84_GAS_NEEDS_PRESSURES: // convert required volume of the gas pointed to by gas_needs_gas_index // into the respective pressure and set the flags convert_gas_needs_to_press(); // increment index to address next gas gas_needs_gas_index++; // if all gases have been converted, advance to next calculation phase if( gas_needs_gas_index == NUM_GAS ) next_planning_phase = PHASE_90_FINISH; break; // //--- finish Calculation Cycle ------------------------------------------------------------ // case PHASE_90_FINISH: // Check if deco obligation is steady state or decreasing. // This works only when an alternative plan is enabled and if it is not a bailout plan, // thus BAILOUT_MODE must not be set while doing the alternative plan. if( (deco_status & CALC_ALT) && !(deco_status & BAILOUT_MODE) ) { if( int_O_TTS_alt < int_O_TTS_norm ) deco_info |= DECO_ZONE; if( int_O_TTS_alt > int_O_TTS_norm ) deco_info &= ~DECO_ZONE; } // export updated deco infos and warnings char_O_deco_info = deco_info; char_O_deco_warnings = deco_warnings; // restore command flag to indicate that deco calculation cycle has finished char_O_deco_status = deco_status; // signal end of deco calculation next_planning_phase = PHASE_00_DONE; break; } // switch // read timer 5, result will be stored in tmr5_value (in 1/32 ms) and tmr5_overflow read_tmr5(); } // sequence calculation phases while not timed out and calculation cycle is not finished while( (tmr5_overflow == 0) && ( next_planning_phase != PHASE_00_DONE ) ); // report where we are in terms of depth reached, used in deco calculator to show deco calculation progress char_O_depth_sim = char_depth_sim; #ifdef _profiling //---- Performance Measurement ------------------------------------------- // convert timer 5 readout into ms profiling_runtime = tmr5_value / 32; // actual runtime longer than target runtime? if( tmr5_overflow ) { // YES - report excess int_O_profiling_overrun = profiling_runtime; // - excess > max we had so far? if( int_O_profiling_overrun > int_O_profiling_overrun_max ) { // YES - update max int_O_profiling_overrun_max = int_O_profiling_overrun; // - store the causing phase char_O_profiling_overrun_phase = profiling_phase; } } else { // NO - calculate unused budget and flag it to be under-run time int_O_profiling_overrun = (2048 - profiling_runtime) | 0x8000; } // increment number of runs in current cycle profiling_runs += 1; // planning cycle completed? if( next_planning_phase == PHASE_00_DONE ) { // YES - export number of runs it took if( deco_status & COMPLETED_NORM ) char_O_profiling_runs_norm = profiling_runs; else char_O_profiling_runs_alt = profiling_runs; } #endif } ////////////////////////////////////////////////////////////////////////////// // calc_hauptroutine_data_input // // Set all C-code dive parameters from their ASM-code values. // void calc_hauptroutine_data_input(void) { overlay float IG_ratio; // safeguard and convert the surface pressure (mbar -> bar) (*) if( int_I_pres_surface < 500 ) pres_surface = 0.500; else pres_surface = 0.001 * int_I_pres_surface; // safeguard and convert the current real pressure if( int_I_pres_respiration < 500 ) real_pres_respiration = 0.500; else real_pres_respiration = 0.001 * int_I_pres_respiration; // safeguard further parameters to protect the tissue-flag and the stop table if( char_I_sim_advance_time > 127 ) char_I_sim_advance_time = 127; if( char_I_extra_time > 127 ) char_I_extra_time = 127; if( char_I_gas_change_time > 99 ) char_I_gas_change_time = 99; // compute the depth in meters where we are now float_depth_real = (real_pres_respiration - pres_surface) * BAR_TO_METER; // convert to integer and round up to next full meter char_depth_real = (unsigned char)(float_depth_real + 0.99); // calculate partial pressure of N2 in respired air at surface pressure calc_N2_equilibrium(); // get, safeguard and convert the saturation and desaturation factors get_saturation_factors(); #ifdef _ccr_pscr // compute a factor that will be used later on for pSCR ppO2 drop calculation (*) float_pSCR_factor = 0.01 * char_I_PSCR_drop * char_I_PSCR_lungratio; #endif #ifdef _helium // get the currently breathed gas ratios real_O2_ratio = 0.01 * char_I_O2_ratio; real_He_ratio = 0.01 * char_I_He_ratio; // calculate the inert gas ratio (local helper variable) IG_ratio = 1.00 - real_O2_ratio; // calculate the N2 ratio real_N2_ratio = IG_ratio - real_He_ratio; #else // get the currently breathed O2 ratio real_O2_ratio = 0.01 * char_I_O2_ratio; // set the He ratio to zero real_He_ratio = 0.0; // calculate the N2 / inert gas ratio real_N2_ratio = IG_ratio = 1.00 - real_O2_ratio; #endif // _helium #ifdef _ccr_pscr // calculate ppO2 drop in pSCR loop for real tissues real_pSCR_drop = IG_ratio * float_pSCR_factor; #endif } ////////////////////////////////////////////////////////////////////////////// // calc_tissues // // INPUT: ppN2 partial pressure of inspired N2 // ppHe partial pressure of inspired He // tissue_increment integration time and tissue selector (real or simulated) // // MODIFIED: real_pres_tissue_N2[] tissue N2 pressures (in real tissues context) // real_pres_tissue_He[] tissue He pressures (in real tissues context) // sim_pres_tissue_N2[] tissue N2 pressures (in simulated tissues context) // sim_pres_tissue_He[] tissue He pressures (in simulated tissues context) // // OUTPUT: char_O_tissue_pres_N2[] tissue N2 pressures scaled for display purpose (in real tissues context) // char_O_tissue_pres_He[] tissue He pressures scaled for display purpose (in real tissues context) // char_O_tissue_pressure[] combined tissue pressures scaled for display purpose (in real tissue context) // static void calc_tissues() { overlay unsigned char period; overlay float temp_tissue_N2; #ifdef _helium overlay float temp_tissue_He; #endif assert( 0.00 <= ppN2 && ppN2 < 11.2 ); // 80% N2 at 130m assert( 0.00 <= ppHe && ppHe < 12.6 ); // 90% He at 130m for( ci=0; ci < NUM_COMP; ci++ ) // iterate through all compartments { i = tissue_increment & TIME_MASK; // extract number of minutes to do (if i > 0) // or if one 2 second period is to do (if i = 0) if( i == 0 ) // check if we shall do one 2-seconds period { read_Buhlmann_times(0); // YES - program coefficients for a 2 seconds period period = 1; // - set period length (in cycles) i = 1; // - and one cycle to do } else if( i > 9 ) // check if we can start with 10 minutes periods { read_Buhlmann_times(2); // YES - program coefficients for 10 minutes periods period = 10; // set period length (in cycles) to ten } else // last but not lease, do 1 to 9 minutes { read_Buhlmann_times(1); // NO - program coefficients for 1 minute periods period = 1; // - set period length (in cycles) to one } do { //---- N2 -------------------------------------------------------- temp_tissue = (tissue_increment & TISSUE_SELECTOR) ? real_pres_tissue_N2[ci] : sim_pres_tissue_N2[ci]; temp_tissue = (ppN2 - temp_tissue) * var_N2_e; apply_saturation_factors(); if( tissue_increment & TISSUE_SELECTOR ) { temp_tissue_N2 = temp_tissue; real_pres_tissue_N2[ci] += temp_tissue; } else { sim_pres_tissue_N2[ci] += temp_tissue; } #ifdef _helium //---- He -------------------------------------------------------- temp_tissue = (tissue_increment & TISSUE_SELECTOR) ? real_pres_tissue_He[ci] : sim_pres_tissue_He[ci]; temp_tissue = (ppHe - temp_tissue) * var_He_e; apply_saturation_factors(); if( tissue_increment & TISSUE_SELECTOR ) { temp_tissue_He = temp_tissue; real_pres_tissue_He[ci] += temp_tissue; } else { sim_pres_tissue_He[ci] += temp_tissue; } #endif //---- decrement loop counter and adjust step size --------------- // decrement loop counter i -= period; // check if we need to switch from 10 minute periods to 1 minute periods if( (i > 0) && (period = 10) && (i < 10) ) { read_Buhlmann_times(1); // program coefficients for 1 minute periods period = 1; // set period length (in cycles) to one } } while( i ); // have the computations been done for the "real" tissues? if( tissue_increment & TISSUE_SELECTOR ) { #ifdef _helium // net tissue balance temp_tissue = temp_tissue_N2 + temp_tissue_He; // check tissue on-/off-gassing and IBCD with applying a threshold of +/-HYST // if ( temp_tissue < -HYST ) // check if the tissue is off-gassing { // tag tissue as not experiencing mentionable IBCD IBCD_tissue_vector &= ~(1 << ci); } else if ( temp_tissue > +HYST ) // check if the tissue in on-gassing { // check for counter diffusion if( ((temp_tissue_N2 > 0.0) && (temp_tissue_He < 0.0)) || ((temp_tissue_N2 < 0.0) && (temp_tissue_He > 0.0)) ) { // tag tissue as experiencing mentionable IBCD IBCD_tissue_vector |= (1 << ci); } } #endif // For N2 tissue pressure display purpose: // basically keep the on-gassing / off-gassing flag from last invocation, but flip // it in case the rate exceeds a set hysteresis (actual value: see #define of HYST) char_O_tissue_pres_N2[ci] &= 128; if ( temp_tissue_N2 > +HYST ) char_O_tissue_pres_N2[ci] = 128; // set flag for tissue pressure is increasing else if ( temp_tissue_N2 < -HYST ) char_O_tissue_pres_N2[ci] = 0; // clear flag (-> tissue pressure is decreasing) // scale N2 tissue pressure such that the surface steady-state tissue loading // of [0.7902 * (1013 hPa - ppWater)] bar will give a 8, which aligns with // the 2nd scale line. temp_tissue_N2 = (8 / (0.7902 * (1.013 - ppWater))) * real_pres_tissue_N2[ci]; // limit to 127 to protect the uppermost bit which holds the sat/desat flag if (temp_tissue_N2 > 127) temp_tissue_N2 = 127; // convert to integer and combine with sat/desat flag char_O_tissue_pres_N2[ci] += (unsigned char)temp_tissue_N2; #ifdef _helium // For He tissue pressure display purpose: // basically keep the on-gassing / off-gassing flag from last invocation, but flip // it in case the rate exceeds a set hysteresis (actual value: see #define of HYST) char_O_tissue_pres_He[ci] &= 128; if ( temp_tissue_He > +HYST ) char_O_tissue_pres_He[ci] = 128; // set flag for tissue pressure is increasing else if ( temp_tissue_He < -HYST ) char_O_tissue_pres_He[ci] = 0; // clear flag (-> tissue pressure is decreasing) // scale He tissue pressure alike it is done for N2. // With no He in a tissue, the result will be 0. temp_tissue_He = (8 / (0.7902 * (1.013 - ppWater))) * real_pres_tissue_He[ci]; // limit to 127 to protect the uppermost bit which holds the sat/desat flag if (temp_tissue_He > 127) temp_tissue_He = 127; // convert to integer and combine with sat/desat flag char_O_tissue_pres_He[ci] += (unsigned char)temp_tissue_He; // For combined tissue pressure display purpose: // basically keep the on-gassing / off-gassing flag from last invocation, but flip // it in case the rate exceeds a set hysteresis (actual value: see #define of HYST) char_O_tissue_pressure[ci] &= 128; if ( temp_tissue > +HYST ) char_O_tissue_pressure[ci] = 128; // set flag for tissue pressure is increasing else if ( temp_tissue < -HYST ) char_O_tissue_pressure[ci] = 0; // clear flag (-> tissue pressure is decreasing) // add the two scaled pressures. temp_tissue = temp_tissue_N2 + temp_tissue_He; // limit to 127 to protect the uppermost bit which holds the sat/desat flag if (temp_tissue > 127) temp_tissue = 127; // convert to integer and combine with sat/desat flag char_O_tissue_pressure[ci] += (unsigned char)temp_tissue; #else // He tissue pressure is zero char_O_tissue_pres_He[ci] = 0; // combined tissue pressure equals N2 tissue pressure char_O_tissue_pressure[ci] = char_O_tissue_pres_N2[ci]; #endif } //if } // for } ////////////////////////////////////////////////////////////////////////////// // calc_limit // // Input: GF_parameter gradient factor to be used, negative values activate surface mode // tissue_increment selector for context: real or simulated tissues // sim_pres_tissue_N2/_He tissue pressures (used in simulated tissues context) // real_pres_tissue_N2/_He tissue pressures (used in real tissues context) // // Output: lead_supersat highest supersaturation found among all tissues, 1.0 = 100% // lead_tissue number of the leading tissue (0-15) // ceiling ceiling in bar relative pressure // // Modified: deco_warnings for IBCD, micro bubbles and outside warning (only in real tissues context) // static void calc_limit(PARAMETER float GF_parameter) { overlay float pres_respiration_min_total = 0.0; overlay unsigned char surface_mode = 0; // 0: off, 1: on // check mode if( GF_parameter < 0 ) { // activate surface mode surface_mode = 1; // normalize parameter GF_parameter = -GF_parameter; } // set leading tissue number to tissue 1 (it has the index 0) lead_tissue = 0; // initialize leading tissue supersaturation value to null lead_supersat = 0.0; // next code section is relevant only when invoked on the real tissues if( tissue_increment & TISSUE_SELECTOR ) { // clear IBCD, micro-bubbles and outside warning flags (locked warnings will be preserved) deco_warnings &= ~( DECO_WARNING_IBCD + DECO_WARNING_MBUBBLES + DECO_WARNING_OUTSIDE + DECO_ATTENTION_OUTSIDE ); } // loop over all tissues for( ci = 0; ci < NUM_COMP; ci++ ) { overlay float pres_respiration_min_tissue; // get the coefficients for tissue ci read_Buhlmann_coefficients(); #ifdef _helium // get the tissue pressures // adopt_Buhlmann_coefficients needs calc_pres_tissue_N2/He when compiled for helium if( tissue_increment & TISSUE_SELECTOR ) { // context is real tissues calc_pres_tissue_N2 = real_pres_tissue_N2[ci]; calc_pres_tissue_He = real_pres_tissue_He[ci]; } else { // context is simulated tissues calc_pres_tissue_N2 = sim_pres_tissue_N2[ci]; calc_pres_tissue_He = sim_pres_tissue_He[ci]; } // overall tissue pressure pres_tissue = calc_pres_tissue_N2 + calc_pres_tissue_He; #else // get the tissue pressure pres_tissue = ( tissue_increment & TISSUE_SELECTOR ) ? real_pres_tissue_N2[ci] : sim_pres_tissue_N2[ci]; #endif // adopt a and b coefficients to current N2/He ratio inside the tissue adopt_Buhlmann_coefficients(); // next calculations are only relevant when invoked on the real tissues if( tissue_increment & TISSUE_SELECTOR ) { overlay float pres_tissue_max; overlay float supersat; overlay float baseline_threshold; // check if tissue is in supersaturation if( pres_tissue > real_pres_respiration ) { // calculate maximum allowed tissue pressure at current ambient pressure pres_tissue_max = real_pres_respiration / var_b + var_a; // calculate current supersaturation value (1.0 = 100%) of this tissue according to straight Buhlmann supersat = ( pres_tissue - real_pres_respiration ) / ( pres_tissue_max - real_pres_respiration ); // calculate supersaturation value for display purpose: 1.35 = 135% = 86 pixel if( supersat <= 1.35 ) char_O_tissue_saturation[ci] = (unsigned char)(supersat * 64); else char_O_tissue_saturation[ci] = 86; // memorize highest supersaturation found if( supersat > lead_supersat ) lead_supersat = supersat; // tissue-dependent baseline threshold for micro bubbles and outside warnings baseline_threshold = 0.02 * ci + 1.0; // micro bubbles warning: supersaturation > baseline threshold if( supersat > baseline_threshold ) deco_warnings |= (DECO_WARNING_MBUBBLES + DECO_WARNING_MBUBBLES_lock); // outside warning: supersaturation > baseline threshold + additional 5% margin if( supersat > (baseline_threshold + 0.05) ) deco_warnings |= (DECO_WARNING_OUTSIDE + DECO_WARNING_OUTSIDE_lock ); } else { // supersaturation is defined as zero while tissue pressure <= ambient pressure supersat = 0.0; char_O_tissue_saturation[ci] = 0; } // next only when in surface mode if( surface_mode ) { // tag tissue whether it is beyond the M-line limit or not if( supersat > 1.0 ) { char_O_tissue_pres_N2[ci] |= 128; #ifdef _helium char_O_tissue_pres_He[ci] |= 128; #endif char_O_tissue_pressure[ci] |= 128; } else { char_O_tissue_pres_N2[ci] &= ~128; #ifdef _helium char_O_tissue_pres_He[ci] &= ~128; #endif char_O_tissue_pressure[ci] &= ~128; } } } // real tissues // calculate the minimum ambient pressure that the tissue can withstand if( char_I_deco_model == 0 ) { // straight Buhlmann pres_respiration_min_tissue = (pres_tissue - var_a) * var_b; } else { // Buhlmann with Eric Baker's varying gradient factor correction // note: this equation [1] is the inverse of equation [2] pres_respiration_min_tissue = ( pres_tissue - (var_a * GF_parameter) ) / ( 1.0 - GF_parameter + (GF_parameter / var_b ) ); } // check if this tissue requires a higher ambient pressure than was found to be needed up to now if( pres_respiration_min_tissue > pres_respiration_min_total ) { pres_respiration_min_total = pres_respiration_min_tissue; lead_tissue = ci; } } // for // compute ceiling for the real tissues in bar relative pressure ceiling = pres_respiration_min_total - pres_surface; #ifdef _helium // IBCD is checked for real tissues only if( tissue_increment & TISSUE_SELECTOR ) { // check if the leading tissue is in IBCD condition if( (IBCD_tissue_vector & (1 << lead_tissue)) && ((real_pres_tissue_N2[lead_tissue] + real_pres_tissue_He[lead_tissue]) > real_pres_respiration) ) { // leading tissue is in IBCD condition and in super-saturation, so issue a warning. deco_warnings |= (DECO_WARNING_IBCD + DECO_WARNING_IBCD_lock); } } #endif } ////////////////////////////////////////////////////////////////////////////// // calc_NDL_time_tissue // // calculation of the remaining no decompression limit (NDL) time for a tissue // // NOTE: Erik Baker's closed formula works for Nitrox. Trimix adds a second // exponential term to the M-value equation, making it impossible to // invert. So we have to solve the problem with a search approach. // // Input: NDL_tissue tissue for which to calculate remaining NDL time // GF_high gradient factor used when GF factors are enabled // ppN2, ppHe partial pressures of N2 and He breathed // // Modified: NDL_time shortest NDL time found so far // NDL_tissue_lead leading tissue, i.e. tissue with the shortest NDL // static void calc_NDL_time_tissue(void) { overlay unsigned char NDL_time_tissue = 0; // NDL time of this tissue, starting with 0 minutes overlay unsigned char step_size = 10; // step size in searching, starting with 10 minutes overlay float pres_limit; // max. tissue pressure allowed #ifdef _helium overlay float last_pres_tissue_N2; // last tissue pressure for N2 overlay float last_pres_tissue_He; // last tissue pressure for He #else overlay float last_pres_tissue; // last tissue pressure #endif // set the compartment index ci for reading the Buhlmann increments and coefficients ci = NDL_tissue; // read the tissue increments for a step size of 10 minutes read_Buhlmann_times(2); // read Buhlmann a and b coefficients for tissue ci read_Buhlmann_coefficients(); #ifdef _helium // get the current simulated tissue pressures calc_pres_tissue_N2 = last_pres_tissue_N2 = sim_pres_tissue_N2[ci]; calc_pres_tissue_He = last_pres_tissue_He = sim_pres_tissue_He[ci]; #else // get the current simulated tissue pressure pres_tissue = last_pres_tissue = sim_pres_tissue_N2[ci]; // set the a and b coefficients adopt_Buhlmann_coefficients(); #endif // simulate an increasing bottom time and check when the NDL is hit for(;;) { #ifdef _helium // calculate the total tissue pressure pres_tissue = calc_pres_tissue_N2 + calc_pres_tissue_He; // adopt a and b coefficients to current N2/He ratio inside the tissue adopt_Buhlmann_coefficients(); #endif // compute the maximum tissue pressure allowed to be exposed to an // ambient pressure equaling the surface pressure if( char_I_deco_model != 0 ) { // GF model enabled, this equation [2] is the inverse of equation [1] pres_limit = (1.0 - GF_high + GF_high / var_b) * pres_surface + GF_high * var_a; } else { // straight Buhlmann pres_limit = pres_surface / var_b + var_a; } // is the tissue pressure higher than the maximum tissue pressure allowed? if( pres_tissue > pres_limit) { // YES - tissue is outside NDL // was the tissue outside NDL right from the start? if( NDL_time_tissue == 0 ) { // YES - search can be aborted // at least one tissue is outside NDL, so overall NDL time is zero NDL_time = 0; // store the number of this tissue as being the leading one NDL_tissue_lead = NDL_tissue; // done break; } // when code execution passes here, the tissue has become // being outside NDL after doing one or more search steps // still searching with a step size of 10 minutes? if( step_size == 10 ) { // YES - retry with smaller step size // go back to last NDL time NDL_time_tissue -= 10; #ifdef _helium // go back to last pressures calc_pres_tissue_N2 = last_pres_tissue_N2; calc_pres_tissue_He = last_pres_tissue_He; #else // go back to last pressure pres_tissue = last_pres_tissue; #endif // reduce step size to 1 minute step_size = 1; // read the tissue increments for a step size of 1 minute read_Buhlmann_times(1); // redo search from last pressure & time within NDL with smaller step size continue; } else { // NO - already tried with a step size of 1 minute // go back to last NDL time that was within NDL NDL_time_tissue -= 1; // is the NDL time of this tissue shorter than the overall NDL time found so far? if( NDL_time_tissue < NDL_time ) { // YES - set this tissue's NDL time as the new overall NDL time NDL_time = NDL_time_tissue; // - store the number of this tissue as being the leading one NDL_tissue_lead = NDL_tissue; } // done break; } } else { // NO - tissue is still within NDL // The search can be terminated when the NDL time of this tissue // exceeds the overall NDL time, thus when a shorter NDL time has // already been found with another tissue. if( NDL_time_tissue >= NDL_time ) break; #ifdef _helium // back-up current tissue pressures last_pres_tissue_N2 = calc_pres_tissue_N2; last_pres_tissue_He = calc_pres_tissue_He; #else // back-up current tissue pressure last_pres_tissue = pres_tissue; #endif // step forward NDL time of current tissue NDL_time_tissue += step_size; #ifdef _helium // step forward tissue pressure - N2 temp_tissue = (ppN2 - calc_pres_tissue_N2) * var_N2_e; // pressure delta breathed - tissue apply_saturation_factors(); // apply safety factor calc_pres_tissue_N2 += temp_tissue; // add pressure delta to tissue // step forward tissue pressure - He temp_tissue = (ppHe - calc_pres_tissue_He) * var_He_e; // pressure delta breathed - tissue apply_saturation_factors(); // apply safety factor calc_pres_tissue_He += temp_tissue; // add pressure delta to tissue #else // step forward tissue pressure temp_tissue = (ppN2 - pres_tissue ) * var_N2_e; // pressure delta breathed - tissue apply_saturation_factors(); // apply safety factor pres_tissue += temp_tissue; // add pressure delta to tissue #endif } } } ////////////////////////////////////////////////////////////////////////////// // clear_deco_table // // Modified: internal_deco_time[] stop durations // internal_deco_depth[] stop depths // internal_deco_gas[] gases used at stops // static void clear_deco_table(void) { for( i = 0; i < NUM_STOPS; ++i ) { internal_deco_time [i] = 0; internal_deco_depth[i] = 0; internal_deco_gas[i] = 0; } // reset stop table index and chained stops counter stop_index = 0; chained_stops = 0; // clear stop table overflow warning deco_warnings &= ~DECO_WARNING_INCOMPLETE; } ////////////////////////////////////////////////////////////////////////////// // update_deco_table // // Add time to a stop at char_depth_sim // // It is possible to create stops with a duration of 0 minutes, e.g. to // note a gas change "on the fly" while ascending. Therefore the criteria // to have reached the end of the list is depth == 0. // // Input: char_depth_sim stop's depth, in meters // sim_gas_current_num gas used at stop, as index 1..5 or 0 for gas 6 // time_increment number of minutes to add to the stop // // Updated: internal_deco_depth[] depth (in meters) of each stop // internal_deco_time [] time (in minutes) of each stop // internal_deco_gas [] gas used (index 1-5) at each stop // static unsigned char update_deco_table(PARAMETER unsigned char time_increment) { assert( char_depth_sim > 0 ); // no stop at surface // is there already a stop entry matching with the current depth and gas? if( internal_deco_depth[stop_index] == char_depth_sim ) if( internal_deco_gas [stop_index] == sim_gas_current_num ) { // YES - increment stop time if possible, stop time entries are // limited to 99 minutes because of display constraints if( internal_deco_time[stop_index] < (100 - time_increment) ) { // YES - time increment fits into current stop entry, // increment stop time and return with status 'success' internal_deco_time[stop_index] += time_increment; return 1; } else { // NO - A chained stop entry will be created further down in the // code to continue the stop, but we will limit the number // of chained stop table entries in order to abort an ever- // running deco calculation. Too many chained entries? if( ++chained_stops >= STOP_CHAINING_LIMIT ) { // YES - set overflow warning and return with status 'failed' deco_warnings |= DECO_WARNING_INCOMPLETE; return 0; } } } // the current stop entry does not match the current depth and gas, // or hasn't enough room left for the time increment // is the current stop entry in use? if( internal_deco_depth[stop_index] > 0 ) { // YES - current entry is in use, need to move on // to next entry position if possible // have all entry positions been used up? if( stop_index < (NUM_STOPS - 1) ) { // NO - move on to next entry position stop_index += 1; } else { // YES - set overflow warning and return with status 'failed' deco_warnings |= DECO_WARNING_INCOMPLETE; return 0; } } // initial use of a new (or the very first) stop entry, // store all stop data and return with status 'success' internal_deco_time [stop_index] = time_increment; internal_deco_depth[stop_index] = char_depth_sim; internal_deco_gas [stop_index] = sim_gas_current_num; return 1; } ////////////////////////////////////////////////////////////////////////////// // publish_deco_table // // Input: internal_deco_depth[] depth in internal stops table // internal_deco_time[] times ... // internal_deco_gas[] gases ... // // Output: char_O_deco_depth[] depth in the external stops table // char_O_deco_time[] times ... // char_O_deco_gas[] gases ... // char_O_deco_time_for_log times in reverse order // static void publish_deco_table(void) { overlay unsigned char x = stop_index; overlay unsigned char y; // copy depth, time and gas from internal to external stops table for( y = 0; y < NUM_STOPS; y++ ) { char_O_deco_depth[y] = internal_deco_depth[y]; char_O_deco_time [y] = internal_deco_time [y]; char_O_deco_gas [y] = internal_deco_gas [y]; } // copy times of shallowest stops to logging table for(y = 0; y < NUM_STOPS_LOG; x-- ) { // copy all stops that have a non-null stop time if( internal_deco_time[x] ) char_O_deco_time_for_log[y++] = internal_deco_time[x]; // abort if all stops are copied if( x == 0) break; } // fill the remainder of the logging table with null // if it is not completely filled already while( y < NUM_STOPS_LOG ) { char_O_deco_time_for_log[y++] = 0; } } ////////////////////////////////////////////////////////////////////////////// // calc_desaturation_time_helper // // Helper function // // Input: pres_actual current tissue pressure // pres_target target tissue pressure // var_ht half-time of the tissue // desat_factor desaturation factor // // Output: int_time time needed by tissue to reach target pressure // static void calc_desaturation_time_helper(void) { // check if actual pressure is higher then target pressure if( pres_actual > pres_target ) { // YES - compute remaining time overlay float pres_ratio; // compute pressure ratio to archive pres_ratio = pres_actual / pres_target; // Compute desaturation time with result rounded up to multiples of 10 minutes. // Main purpose is to avoid confusion, because the times do not clock down in // one minute steps any more but get constantly re-computed according to current // ambient pressure and may therefor make steps of several minutes forwards and // backwards as ambient pressure rises/falls and N2/He ratio is being adjusted. int_time = (unsigned short)( (var_ht * log(pres_ratio) / desat_factor) + 0.9 ); } else { // NO - desaturation state reached, no remaining time int_time = 0; } } ///////////////////////////////////////////////////////////////////////////// // calc_desaturation_time // // Calculates the time needed for the tissues to equilibrate with // surface pressure and the no-fly / no-altitude time. // // Input: int_I_pres_surface // char_I_desaturation_multiplier // // Output: int_O_desaturation_time // int_O_nofly_time // void calc_desaturation_time(void) { overlay float P_ambient_altitude; assert( 800 < int_I_pres_surface && int_I_pres_surface < 1100 ); assert( 0 < char_I_desaturation_multiplier && char_I_desaturation_multiplier <= 100 ); // safeguard and convert surface pressure if( int_I_pres_surface < 500) pres_surface = 0.5; else pres_surface = 0.001 * int_I_pres_surface; // calculate partial pressure of N2 in respired air at surface pressure calc_N2_equilibrium(); // get, safeguard and convert the saturation and desaturation factors get_saturation_factors(); // pre-computed term for later use: 10 [Min] * 0.6931 [=log(2)] * 1 [Desat Factor] * ... desat_factor = (6.931 * SURFACE_DESAT_FACTOR) * float_desaturation_multiplier; // initialize vars int_O_desaturation_time = 0; int_O_nofly_time = 0; // get selected target altitude switch( char_I_altitude_wait ) { case 1: P_ambient_altitude = P_ambient_1000m; break; case 2: P_ambient_altitude = P_ambient_2000m; break; case 3: P_ambient_altitude = P_ambient_3000m; break; default: P_ambient_altitude = P_ambient_fly; break; } // loop over all compartments in order slowest to fastest for( ci = NUM_COMP; ci > 0; ) { overlay float pres_tissue_max; overlay unsigned short nofly_last = ~0; overlay unsigned short nofly_N2 = 0; #ifdef _helium overlay signed char search_direction; overlay unsigned short nofly_He = 0; #endif // decrement compartment index ci -= 1; // get the Buhlmann halftimes and coefficients read_Buhlmann_ht(); read_Buhlmann_coefficients(); // // Desaturation time // // calculate desaturation time for N2 in tissue, // desaturated state is defined as residual tissue pressure <= 1.05 x ppN2 respired // current tissue pressure above equilibrium pressure pres_actual = real_pres_tissue_N2[ci] - N2_equilibrium; // target pressure above equilibrium pressure pres_target = 0.05 * N2_equilibrium; // half-time of the current tissue var_ht = var_N2_ht; // calculate desaturation time calc_desaturation_time_helper(); // store desaturation time if it is longer than longest found so far if( int_time > int_O_desaturation_time) int_O_desaturation_time = int_time; #ifdef _helium // calculate desaturation time for He in the tissue, // desaturated state is defined as residual tissue pressure <= 0.05 x ppN2 respired // actual tissue pressure above equilibrium: equilibrium for He is 0 bar pres_actual = real_pres_tissue_He[ci]; // target pressure above equilibrium pressure: use same target pressure as for N2 pres_target = 0.05 * N2_equilibrium; // half-time of the current tissue var_ht = var_He_ht; // calculate desaturation time calc_desaturation_time_helper(); // store desaturation time if it is longer than longest found so far if( int_time > int_O_desaturation_time) int_O_desaturation_time = int_time; #endif // // no-fly time // // Target pressure for the tissue is the Buhlmann limit. We use the Buhlmann // coefficients for N2 also for He because it is easier to calculate and the // N2 coefficients are more conservative than those for He, so we are on the // safe side, too. pres_tissue_max = (P_ambient_altitude/var_N2_b + var_N2_a); // adjust target pressure by GF-high in case the GF model is in use, but not // for the no-fly time as it's target pressure is hard to reach anyhow if( char_I_deco_model && char_I_altitude_wait ) pres_tissue_max = P_ambient_altitude + 0.01 * char_I_GF_High_percentage * (pres_tissue_max - P_ambient_altitude); #ifdef _helium //---- Variant with Helium ------------------------------------------- // initialize split_N2_He in case there was a hard reboot / memory clear if( split_N2_He[ci] == 0 ) split_N2_He[ci] = 90; // initialize search direction search_direction = 0; for(;;) { // Calculate no-fly time for N2 in the tissue. // Flying is permitted when the N2 pressure fits into the assigned fraction above equilibrium. // current tissue pressure above equilibrium pres_actual = real_pres_tissue_N2[ci] - N2_equilibrium; // target pressure above equilibrium pressure, weighted by N2/He split pres_target = (split_N2_He[ci] * 0.01) * (pres_tissue_max - N2_equilibrium); // half-time of the current tissue var_ht = var_N2_ht; // check if desaturation to target pressure is possible at all if( pres_target < 0.0 ) { // NO - set no-fly time to 288 * 10 min = 48 h int_O_nofly_time = 288; break; } else { // YES - calculate desaturation time calc_desaturation_time_helper(); // store time found nofly_N2 = int_time; } // calculate no-fly time for He in the tissue, // flying is permitted when the He pressure fits into the assigned fraction // current tissue pressure above equilibrium: equilibrium for He is 0 bar pres_actual = real_pres_tissue_He[ci]; // target pressure above equilibrium pressure, weighted by N2/He split pres_target = ((100 - split_N2_He[ci]) * 0.01) * (pres_tissue_max - N2_equilibrium); // half-time of the current tissue var_ht = var_He_ht; // calculate desaturation time calc_desaturation_time_helper(); // store time found nofly_He = int_time; // Because the sum of N2 and He tissue pressures needs to fit into the Buhlmann limit for // no-fly time calculation, each gas gets assigned a fraction of the available total pressure // limit. The optimum split between the two gases can not be computed by a single formula, // because this would require the inversion of a function with two exponential terms, which is // not possible. We do not want to do a computational complex simulation here like it is done // in the deco calculation code (although we tackle the same base problem here), so we just let // the computer try out which split will balance the no-fly times induced by the N2 and the He // at best. // first of all, skip any optimization in case the current compartment is not the leading one if( (nofly_N2 <= int_O_nofly_time) && (nofly_He <= int_O_nofly_time) ) break; // check if the N2 requires more waiting time than the He if( nofly_N2 >= nofly_He ) { // check if the search direction has changed, which means we are beyond the // optimum now, or if we are at the upper stop limit of split_N2_He if( (search_direction < 0) || (split_N2_He[ci] == 99) ) { // either the just completed iteration was more close to the optimum or the one before // was, so we take the best (i.e. shortest) time of both as the final no-fly time int_O_nofly_time = (nofly_N2 < nofly_last) ? nofly_N2 : nofly_last; // done break; } // store the no-fly time found in this iteration nofly_last = nofly_N2; // increase the N2 fraction of the split split_N2_He[ci] += 1; // set search direction towards more N2 search_direction = +1; } else { // check if the search direction has changed, which means we are beyond the // optimum now, or if we are at the lower stop limit of split_N2_He if( (search_direction > 0) || (split_N2_He[ci] == 1) ) { // either the just completed iteration was more close to the optimum or the one before // was, so we take the best (i.e. shortest) time of both as the final no-fly time int_O_nofly_time = (nofly_He < nofly_last) ? nofly_He : nofly_last; // done break; } // store the no-fly time found in this iteration nofly_last = nofly_He; // decrease the N2 fraction of the split split_N2_He[ci] -= 1; // set search direction towards less N2 search_direction = -1; } } // for(;;) #else //---- Variant without Helium ---------------------------------------- // current tissue pressure above equilibrium pres_actual = real_pres_tissue_N2[ci] - N2_equilibrium; // target pressure above equilibrium pressure pres_target = pres_tissue_max - N2_equilibrium; // half-time of the current tissue var_ht = var_N2_ht; // check if desaturation to target pressure is possible at all if( pres_target < 0.0 ) { // NO - set no-fly time to 288 * 10 min = 48 h int_O_nofly_time = 288; } else { // YES - calculate desaturation time calc_desaturation_time_helper(); // - extend desaturation time if this tissue needs // more time than already found to be needed if( int_time > int_O_nofly_time ) int_O_nofly_time = int_time; } #endif } // for(compartments) // rescale int_O_desaturation_time and int_O_nofly_time to full minutes for display purpose int_O_desaturation_time *= 10; int_O_nofly_time *= 10; // limit int_O_desaturation_time and int_O_nofly_time to 5999 = 99 hours + 59 minutes // because of display space constraints and rounding done above if( int_O_desaturation_time > 5999 ) int_O_desaturation_time = 5999; if( int_O_nofly_time > 5999 ) int_O_nofly_time = 5999; // Clear the micro bubbles warning when the current gradient factor is < 100%. // The current gradient factor is calculated by calc_interval() while not in diving mode. // As the locked warning will stay set, this will cause the warning be be displayed in // attention color instead of warning color. if( int_O_lead_supersat < 100 ) deco_warnings &= ~DECO_WARNING_MBUBBLES; // clear some warnings when the desaturation time has become zero if( int_O_desaturation_time == 0 ) deco_warnings &= ~( DECO_WARNING_IBCD + DECO_WARNING_IBCD_lock + DECO_WARNING_MBUBBLES + DECO_WARNING_MBUBBLES_lock + DECO_WARNING_OUTSIDE + DECO_WARNING_OUTSIDE_lock + DECO_ATTENTION_OUTSIDE ); } ////////////////////////////////////////////////////////////////////////////// // Calculate desaturation of the real tissues for a given time interval // // Caution: Works on the real tissues! // If in doubt, use this function only inside a context surrounded with // push_tissues_to_vault() / pull_tissues_from_vault() ! // // Input: int_I_pres_surface surface pressure in mbar // time_interval time interval in minutes, must be limited to 254 at max // // Modified: tissue pressures N2 and He pressures of the tissues // CNS_fraction_real current real CNS value // ceiling minimum allowed depth in mbar relative pressure // lead_supersat supersaturation of the leading tissue (float) // int_O_lead_supersat supersaturation of the leading tissue (integer) // static void calc_interval(PARAMETER unsigned char time_interval) { overlay unsigned char time; assert( 800 < int_I_pres_surface && int_I_pres_surface < 1100 ); assert( 100 <= char_I_saturation_multiplier && char_I_saturation_multiplier < 200 ); assert( 0 < char_I_desaturation_multiplier && char_I_desaturation_multiplier <= 100 ); // safeguard and convert surface pressure if( int_I_pres_surface < 500) pres_surface = 0.500; else pres_surface = 0.001 * int_I_pres_surface; // set breathed pressure to surface pressure real_pres_respiration = pres_surface; // calculate partial pressure of N2 in respired air at surface pressure calc_N2_equilibrium(); // calculate partial pressures (0.7902 is fraction of N2 in atmosphere as of Buhlmann) ppN2 = N2_equilibrium; ppHe = 0.0; // get, safeguard and convert the saturation and desaturation factors get_saturation_factors(); // adjust desaturation factor to surface mode float_desaturation_multiplier *= SURFACE_DESAT_FACTOR; // Calculate the tissues: // Because calc_tissues() can calculate for 127 minutes at max, // the tissue updating may need to be done in two chunks. time = time_interval; // first chunk for the part exceeding 127 minutes if( time > 127) { // do a full 127 minutes on the real tissues tissue_increment = TISSUE_SELECTOR | 127; calc_tissues(); // determine the remaining time time -= 127; } // program the remaining time (or full time if not exceeding 127 minutes) on the real tissues tissue_increment = TISSUE_SELECTOR | time; // update the N2 and He pressures in the tissues calc_tissues(); // Calculate CNS: // To speed up things and because on most invocations of this code char_I_dive_interval // is a multiple of 10 minutes, we loop the loop-counter down using two speeds. time = time_interval; while( time ) { if( time > 9 ) { CNS_fraction_real *= 0.925874712; // half-time = 90 min -> 10 min: (1/2)^(1/9) time -= 10; // fast speed looping } else { CNS_fraction_real *= 0.992327946; // half-time = 90 min -> 1 min: (1/2)^(1/90) time -= 1; // slow speed looping } } // convert the CNS value to integer convert_cur_CNS_for_display(); // calculate the supersaturation of the leading tissue, the // negative argument puts calc_limit() into surface mode // Attention: do not pass char_I_GF_High_percentage as an argument // here because it is not configured outside dive mode calc_limit(-1.0); // convert the saturation value of the leading tissue to integer convert_sat_for_display(); } ////////////////////////////////////////////////////////////////////////////// // calc_CNS // // Input: char_ppO2 current ppO2 [in 0.1 bars] // tissue_increment time increment and tissue selector // // Modified: CNS_fraction_real accumulated CNS (real tissue context) // CNS_fraction_sim accumulated CNS (simulated tissue context) // static void calc_CNS(void) { overlay float CNS_fraction_inc; // increment of CNS load, 0.01 = 1% // calculate CNS increment for 2 seconds interval if( char_ppO2 > 160 ) { // step-wise CNS increment // calculate index for increment look-up cns_i = (char_ppO2 - 161) / 5; // integer division // indexes > 17 use increment of index 17 if( cns_i > 17 ) cns_i = 17; // read coefficient (increment) read_CNS_c_coefficient(); // re-scale coefficient from storage format in [1/100000] to productive value CNS_fraction_inc = (float)var_cns_c / 100000.0; } else if( char_ppO2 > 50 ) { // range wise CNS increment approximation // calculate index for approximation coefficients look-up cns_i = (char_ppO2 - 51) / 10; // integer division // read coefficients read_CNS_ab_coefficient(); // calculate the CNS increment CNS_fraction_inc = 1.0 / (var_cns_a * char_ppO2 + var_cns_b ); } else { // no increment up to 0.5 bar ppO2 CNS_fraction_inc = 0.0; } // apply a time factor in case of minute-based interval (factor = N * 30.0) if( tissue_increment & TIME_MASK ) { CNS_fraction_inc *= (float)(tissue_increment & TIME_MASK) * 30.0; } // update the CNS accumulator if ( tissue_increment & TISSUE_SELECTOR ) CNS_fraction_real += CNS_fraction_inc; // real tissues else CNS_fraction_sim += CNS_fraction_inc; // simulated tissues } ////////////////////////////////////////////////////////////////////////////// // calc_due_by_depth_time_sac (Helper Function saving Code Space) // // Calculates the gas volume required for a given depth, time and usage (SAC) // rate. It uses a fixed surface pressure of 1.0 bar to deliver stable results // when used through the deco calculator. // // Input: gas_needs_depth depth in meters // gas_needs_time time in minutes // gas_needs_usage_rate gas usage in liters per minute at surface pressure // // Output: gas_needs_volume_due required gas volume in liters // static void calc_due_by_depth_time_sac(void) { gas_needs_volume_due = ((float)gas_needs_depth * METER_TO_BAR + pres_surface) * gas_needs_time * gas_needs_usage_rate; } ////////////////////////////////////////////////////////////////////////////// // calc_TR_functions // // Process Pressure Readings (OSTC TR only) // // Input: todo // // Output: todo // #ifdef _rx_functions static void calc_TR_functions(void) { // pressure warnings for reading 1, but only if enabled and pressure value available if( (char_I_pressure_gas[0] > 0) && !(int_IO_pressure_value[0] & INT_FLAG_NOT_AVAIL) ) { overlay unsigned short pressure_value = int_IO_pressure_value[0] & ~INT_FLAG_OUTDATED; if( (char_I_pressure_gas[0] < 6 ) && !(int_O_pressure_need[0] & INT_FLAG_NOT_AVAIL) ) { // not a diluent and need available: warning & attention by need if ( pressure_value <= int_O_pressure_need[0]) int_IO_pressure_value[0] |= INT_FLAG_WARNING; else if( pressure_value <= int_O_pressure_need[0] + int_O_pressure_need[0] / 2 ) int_IO_pressure_value[0] |= INT_FLAG_ATTENTION; } else { // a diluent or need not available: warning & attention by fixed thresholds if ( pressure_value <= PRESSURE_LIMIT_WARNING ) int_IO_pressure_value[0] |= INT_FLAG_WARNING; else if ( pressure_value <= PRESSURE_LIMIT_ATTENTION ) int_IO_pressure_value[0] |= INT_FLAG_ATTENTION; } } // pressure warnings for reading 2, but only if enabled and pressure value available if( (char_I_pressure_gas[1] > 0) && !(int_IO_pressure_value[1] & INT_FLAG_NOT_AVAIL) ) { overlay unsigned short pressure_value = int_IO_pressure_value[1] & ~INT_FLAG_OUTDATED; if( (char_I_pressure_gas[1] < 6 ) && !(int_O_pressure_need[1] & INT_FLAG_NOT_AVAIL) ) { // not a diluent and need available: warning & attention by need if ( pressure_value <= int_O_pressure_need[1]) int_IO_pressure_value[1] |= INT_FLAG_WARNING; else if ( pressure_value <= int_O_pressure_need[1] + int_O_pressure_need[1] / 2 ) int_IO_pressure_value[1] |= INT_FLAG_ATTENTION; } else { // a diluent or need not available: warning & attention by fixed thresholds if ( pressure_value <= PRESSURE_LIMIT_WARNING ) int_IO_pressure_value[1] |= INT_FLAG_WARNING; else if ( pressure_value <= PRESSURE_LIMIT_ATTENTION ) int_IO_pressure_value[1] |= INT_FLAG_ATTENTION; } } //--- SAC Calculation --------------------------------------------------------------------- // // char_I_SAC_mode =0: disabled // =1: SAC from 1st reading // =2: SAC from 2nd reading // =3: SAC from higher one of both pressure drops (independent double mode) // =4: SAC (O2 usage) from 2nd reading without real_pres_respiration term // set SAC rate to not available by default int_O_SAC_measured = 0 + INT_FLAG_NOT_AVAIL; // get a copy of the current absolute pressure pres_respiration_sac = real_pres_respiration; // set threshold for SAC rate attention max_sac_rate = (deco_info & DECO_MODE) ? char_I_SAC_deco : char_I_SAC_work; // char_I_SAC_deco / char_I_SAC_work are in l/min, max_sac_rate is in 0.1 l/min max_sac_rate *= 10; // pre-process SAC mode 3 (independent double) if( char_I_SAC_mode == 3 ) { overlay unsigned char reading1_gas; overlay unsigned char reading2_gas; overlay unsigned char reading1_tanksize; overlay unsigned char reading2_tanksize; overlay unsigned short reading1_press; overlay unsigned short reading2_press; overlay unsigned short reading1_drop; overlay unsigned short reading2_drop; // get gas numbers (1-10) of both readings reading1_gas = char_I_pressure_gas[0]; reading2_gas = char_I_pressure_gas[1]; // default to no SAC calculation char_I_SAC_mode = 0; // clear switch advice by default deco_info &= ~IND_DOUBLE_SWITCH_FLAG; // check if both readings are configured and available if( reading1_gas ) if( reading2_gas ) if( !(int_IO_pressure_value[0] & INT_FLAG_NOT_AVAIL) ) if( !(int_IO_pressure_value[1] & INT_FLAG_NOT_AVAIL) ) if( !(int_I_pressure_drop[0] & INT_FLAG_NOT_AVAIL) ) if( !(int_I_pressure_drop[1] & INT_FLAG_NOT_AVAIL) ) { // get tank pressures, stripping flags reading1_press = int_IO_pressure_value[0] & 0x0FFF; // in 0.1 bar reading2_press = int_IO_pressure_value[1] & 0x0FFF; // in 0.1 bar // get pressure drops as integers, stripping flags and shifting right // to avoid an overflow when multiplying with the tank size later on reading1_drop = (int_I_pressure_drop[0] & 0x0FFF) >> 2; reading2_drop = (int_I_pressure_drop[1] & 0x0FFF) >> 2; // get tank sizes reading1_tanksize = char_I_gas_avail_size[reading1_gas-1]; reading2_tanksize = char_I_gas_avail_size[reading2_gas-1]; // set mode to calculate SAC on the reading with the higher absolute drop char_I_SAC_mode = (reading1_drop * reading1_tanksize > reading2_drop * reading2_tanksize) ? 1 : 2; // compute switch advice if pressure (in 0.1 bar) of tank breathed from is // more than char_I_max_pres_diff (in bar) below pressure of the other tank. if( char_I_SAC_mode == 1 ) { // breathing from reading 1, switch advice if pressure on reading 1 lower than on 2 if( (reading1_press + 10*char_I_max_pres_diff) <= reading2_press ) deco_info |= IND_DOUBLE_SWITCH_FLAG; } else { // breathing from reading 2, switch advice if pressure on reading 2 lower than on 1 if( (reading2_press + 10*char_I_max_pres_diff) <= reading1_press ) deco_info |= IND_DOUBLE_SWITCH_FLAG; } } } // pre-process SAC mode 4 (O2 usage by reading 2) if( char_I_SAC_mode == 4 ) { // O2 usage on CCR is independent from absolute pressure pres_respiration_sac = 1.0; // O2 pressure drop is measured via reading 2 char_I_SAC_mode = 2; // reconfigure max SAC rate to O2 consumption attention threshold max_sac_rate = O2_CONSUMPTION_LIMIT_ATTENTION; } // select which pressure reading to log if( char_I_SAC_mode == 1 ) int_O_tank_pressure = int_IO_pressure_value[0]; else if( char_I_SAC_mode == 2 ) int_O_tank_pressure = int_IO_pressure_value[1]; else int_O_tank_pressure = 0; // strip flags int_O_tank_pressure &= 0x0FFF; // TODO: decide if log shall be in 0.1 bar of full bar only // scale to full bar only int_O_tank_pressure /= 10; // calculate SAC - modes 1 & 2 if( (char_I_SAC_mode == 1) || (char_I_SAC_mode == 2) ) { overlay unsigned char reading_index; overlay unsigned char reading_gas; overlay unsigned char reading_tanksize; overlay float reading_drop; // set index: char_I_SAC_mode = 1 -> reading one, index 0 // = 2 -> two, 1 reading_index = char_I_SAC_mode - 1; // get gas number (1-10) reading_gas = char_I_pressure_gas[reading_index]; // check if reading is configured and available if( reading_gas ) if( !(int_I_pressure_drop[reading_index] & INT_FLAG_NOT_AVAIL) ) { // get tank size (in liter) reading_tanksize = char_I_gas_avail_size[reading_gas-1]; // get pressure drop as float, stripping flags (in 1/5120 bar/sec) reading_drop = (float)(int_I_pressure_drop[reading_index] & 0x0FFF); // check if pressure drop is within range if( !(int_I_pressure_drop[reading_index] & INT_FLAG_OUT_OF_RANGE) ) { // calculate SAC, 10 is factor to have result in 0.1 liter/min // 60 is factor for 60 seconds per 1 minute, // 5120 accounts for reading_drop being in 1/5120 bar/sec // 10*60/5120 = 60/512 = 15/128 float_sac = reading_drop * 15/128 * reading_tanksize / pres_respiration_sac; // limit result to 999 (99.9 liter/min) if ( float_sac >= 998.5 ) { int_O_SAC_measured = 999 + INT_FLAG_ATTENTION; } else { // convert float to integer int_O_SAC_measured = (unsigned short)(float_sac + 0.5); // set attention flag if exceeding SAC threshold, but only if pressure drop is not outdated if( !(int_I_pressure_drop[reading_index] & INT_FLAG_OUTDATED) ) if( int_O_SAC_measured >= max_sac_rate ) { int_O_SAC_measured |= INT_FLAG_ATTENTION; } } } else { // pressure drop is out of range, so SAC will be set out of range, too int_O_SAC_measured = 999 + INT_FLAG_ATTENTION; } // copy outdated flag from int_I_pressure_drop to int_O_SAC_measured if( int_I_pressure_drop[reading_index] & INT_FLAG_OUTDATED ) { int_O_SAC_measured |= INT_FLAG_OUTDATED; } } } } #endif ////////////////////////////////////////////////////////////////////////////// // convert_gas_needs_to_press // // Converts gas volumes into pressures and sets respective flags // // Input: gas_needs_gas_index index of the gas to convert (0-4) // gas_volume_need[] needed gas volume in liters // char_I_gas_avail_pres[] available gas volume in bar // char_I_gas_avail_size[] size of the tanks in liters // char_I_pressure_gas[] gas configured on reading 1/2 (TR only) // // Output: int_O_gas_need_vol[] required gas amount in liters, including flags // int_O_gas_need_pres[] required gas amount in bar, including flags // int_O_pressure_need[] required gas amount for reading 1/2 (TR only) // static void convert_gas_needs_to_press(void) { // just to make the code more readable... i = gas_needs_gas_index; if( gas_volume_need[i] >= 65534.5 ) { int_O_gas_need_vol[i] = 65535; // clip at 65535 liters int_O_gas_need_pres[i] = 999 | INT_FLAG_WARNING | INT_FLAG_HIGH; // 999 bar + warning flag + >999 flag } else { overlay unsigned short int_pres_warn; overlay unsigned short int_pres_attn; // set warning and attention thresholds int_pres_warn = 10.0 * (unsigned short)char_I_gas_avail_pres[i]; int_pres_attn = GAS_NEEDS_LIMIT_ATTENTION * int_pres_warn; // convert ascent gas volume need from float to integer [in liter] int_O_gas_need_vol[i] = (unsigned short)gas_volume_need[i]; // compute how much pressure in the tank will be needed [in bar] int_O_gas_need_pres[i] = (unsigned short)( gas_volume_need[i] / char_I_gas_avail_size[i] + 0.999 ); // limit result to 999 bar because of display constraints if( int_O_gas_need_pres[i] > 999 ) int_O_gas_need_pres[i] = 999 | INT_FLAG_HIGH; // set flags for fast evaluation by dive mode if ( int_O_gas_need_pres[i] == 0 ) int_O_gas_need_pres[i] |= INT_FLAG_ZERO; else if ( int_O_gas_need_pres[i] >= int_pres_warn ) int_O_gas_need_pres[i] |= INT_FLAG_WARNING; else if ( int_O_gas_need_pres[i] >= int_pres_attn ) int_O_gas_need_pres[i] |= INT_FLAG_ATTENTION; } // set invalid flag if there is an overflow in the stops table if( deco_warnings & DECO_WARNING_INCOMPLETE ) int_O_gas_need_pres[i] |= INT_FLAG_INVALID; #ifdef _rx_functions // only for OSTC TR model with TR functions enabled if( main_status & TR_FUNCTIONS ) { // char_I_pressure_gas[] uses gas indexes from 1-10, loop variable i runs from 0 to 4 overlay unsigned char j = i+1; // check if the current gas is configured on pressure reading 1 or 2 if( (char_I_pressure_gas[0] == j) || (char_I_pressure_gas[1] == j) ) { // get a copy of the required pressure in full bar overlay unsigned short int_pres_need = int_O_gas_need_pres[i]; // strip all flags int_pres_need &= 1023; // limit to 400 bar and multiply by 10 to get required pressure in 0.1 bar int_pres_need = (int_pres_need > 400) ? 4000 | INT_FLAG_OUT_OF_RANGE : 10 * int_pres_need; // tag as not available if there is an overflow in the stops table if( deco_warnings & DECO_WARNING_INCOMPLETE ) int_pres_need |= INT_FLAG_NOT_AVAIL; // copy to reading data (in both readings the same gas could be configured) if( char_I_pressure_gas[0] == j ) int_O_pressure_need[0] = int_pres_need; if( char_I_pressure_gas[1] == j ) int_O_pressure_need[1] = int_pres_need; } } // TR functions #endif } ////////////////////////////////////////////////////////////////////////////// // convert the real CNS value to integer // // Input CNS_fraction_real current CNS value as float // // Output: int_O_CNS_current current CNS value as integer including flags // static void convert_cur_CNS_for_display(void) { // convert to integer float_value = CNS_fraction_real; convert_float_to_int(); int_O_CNS_current = int_value; // set warning & attention flags if ( int_O_CNS_current >= CNS_LIMIT_WARNING ) int_O_CNS_current |= INT_FLAG_WARNING; else if ( int_O_CNS_current >= CNS_LIMIT_ATTENTION ) int_O_CNS_current |= INT_FLAG_ATTENTION; } ////////////////////////////////////////////////////////////////////////////// // convert the simulated CNS value to integer // // Input: CNS_fraction_sim CNS value after predicted ascent in float // // Output: int_sim_CNS_fraction CNS value after predicted ascent in integer // including flags, will be routed to // int_O_{normal,alternative}_CNS_fraction // static void convert_sim_CNS_for_display(void) { // convert to integer float_value = CNS_fraction_sim; convert_float_to_int(); int_sim_CNS_fraction = int_value; // set warning & attention flags if ( int_sim_CNS_fraction >= CNS_LIMIT_WARNING ) int_sim_CNS_fraction |= INT_FLAG_WARNING; else if ( int_sim_CNS_fraction >= CNS_LIMIT_ATTENTION ) int_sim_CNS_fraction |= INT_FLAG_ATTENTION; // set invalid flag if there is an overflow in the stops table if ( deco_warnings & DECO_WARNING_INCOMPLETE ) int_sim_CNS_fraction |= INT_FLAG_INVALID; } ////////////////////////////////////////////////////////////////////////////// // convert the saturation value of the leading tissue to integer // // Input lead_supersat saturation of the leading tissue // lead_tissue number of the leading tissue // char_I_GF_High_percentage GF high factor // // Output: int_O_lead_supersat saturation of the leading tissue // char_O_lead_tissue number of the leading tissue // // Modified: deco_warnings deco engine warnings vector // static void convert_sat_for_display(void) { // convert supersaturation of the leading tissue to int_O_lead_supersat in % (1.0 = 100%) // limit to 255 because of constraints in ghostwriter code if ( lead_supersat <= 0.000 ) int_O_lead_supersat = 0; else if ( lead_supersat > 2.545 ) int_O_lead_supersat = 255; else int_O_lead_supersat = (unsigned short)(100 * lead_supersat + 0.5); // set warning & attention flags if( int_O_lead_supersat > 100 ) { int_O_lead_supersat |= INT_FLAG_WARNING; // make GF factor shown in red deco_warnings |= DECO_WARNING_OUTSIDE; // make depth shown in red } else if( (char_I_deco_model != 0) && (int_O_lead_supersat > char_I_GF_High_percentage) || (char_I_deco_model == 0) && (int_O_lead_supersat > 99 ) ) { int_O_lead_supersat |= INT_FLAG_ATTENTION; // make GF factor shown in yellow deco_warnings |= DECO_ATTENTION_OUTSIDE; // make depth shown in yellow } // export also the number of the leading tissue char_O_lead_tissue = lead_tissue; } ////////////////////////////////////////////////////////////////////////////// // convert the ceiling value to integer // // Input: ceiling minimum depth permitted in float // // Output: int_O_ceiling minimum depth permitted in mbar (cm) // // Modified: deco_info deco engine information vector // static void convert_ceiling_for_display(void) { // Convert ceiling to int_O_ceiling in mbar relative pressure. // Round up to next 10 cm so that the ceiling disappears only // when the ceiling limit is really zero. This will coincident // with TTS switching back to NDL time. // The +1.5 term figures in the conversion factor of 10.015 m/bar // which is used inside the deco engine but not outside of it. if ( ceiling <= 0.0 ) int_O_ceiling = 0; else if ( ceiling > 16.0 ) int_O_ceiling = 16000; else int_O_ceiling = (unsigned short)(ceiling * (1000+1.5) + 9); // set/reset ceiling flag if ( int_O_ceiling ) deco_info |= DECO_CEILING; else deco_info &= ~DECO_CEILING; } ////////////////////////////////////////////////////////////////////////////// // push_tissues_to_vault & pull_tissues_from_vault // // ATTENTION: Do not use from inside the deco engine! // The vault is exclusively reserved to back-up and restore the real // tissues and related data when entering / leaving simulation mode! // // Input/Output: CNS_fraction_real current real CNS value // char_O_deco_warnings deco engine warnings vector // real_pres_tissue_N2[] partial pressure of N2 in real tissues // real_pres_tissue_He[] partial pressure of He in real tissues // // Output: int_O_CNS_current current CNS value as integer including flags // static void push_tissues_to_vault(void) { // store the current CNS value and deco warnings vault_CNS_fraction_real = CNS_fraction_real; vault_deco_warnings = char_O_deco_warnings; vault_deco_info = char_O_deco_info; // store the tissue pressures for( i = 0; i < NUM_COMP; i++ ) { vault_pres_tissue_N2[i] = real_pres_tissue_N2[i]; #ifdef _helium vault_pres_tissue_He[i] = real_pres_tissue_He[i]; #else vault_pres_tissue_He[i] = 0; #endif } } static void pull_tissues_from_vault(void) { // restore the CNS value and deco warnings CNS_fraction_real = vault_CNS_fraction_real; char_O_deco_warnings = vault_deco_warnings; char_O_deco_info = vault_deco_info; // convert the CNS value to integer convert_cur_CNS_for_display(); // restore the tissue pressures for( i = 0; i < NUM_COMP; i++ ) { real_pres_tissue_N2[i] = vault_pres_tissue_N2[i]; #ifdef _helium real_pres_tissue_He[i] = vault_pres_tissue_He[i]; #else real_pres_tissue_He[i] = 0; #endif } } ////////////////////////////////////////////////////////////////////////////// // #ifndef CROSS_COMPILE void main() {} #endif