annotate Discovery/Src/buehlmann.c @ 862:974648b5ccfe Evo_2_23

Only use deco gas for calculation if option is enabled: The gas menu meanwhile provides the possibility to select a gas for deco (having the gas switching reminder visible) without the need to visualize the reduced deco time. If the visualization of the deco considering all gas changes is wanted then this may be enabled by selecting the gas additionaly for deco calculation.
author Ideenmodellierer
date Tue, 02 Jul 2024 19:24:03 +0200
parents e963d32f746e
children
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51
8f8ea3a32e82 Resolved warnings pointing to possible invalid memory access
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1 /* getrennte Gase f�r die verschiedenen Modi
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2 um Gaswechsel Eintr�ge zu vereinfachen
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3 das heisst:
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4 oc == bailout in cc mode
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5 */
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6
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7 /* Konvention:
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8 float extExample_variable_can_be_used_with_extern;
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9 */
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10
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11 #include <string.h>
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12 #include <math.h>
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13 #include <stdbool.h>
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14 #include "buehlmann.h"
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15 #include "decom.h"
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16
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17 extern const float buehlmann_N2_a[];
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18 extern const float buehlmann_N2_b[];
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19 extern const float buehlmann_He_a[];
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20 extern const float buehlmann_He_b[];
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21
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22 typedef struct
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23 {
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24 float depth;
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25 int id;
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26 } SStop;
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27
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28 #define DECO_STOPS_MAX_TTS_CALCULATON_IN_SECONDS 59940 // 999 minuten; before: 18000 // 5(h) * 60(min) * 60 sec = 18000 sec
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29 #define DECO_STOPS_MAX_TTS_FOR_EVERY_SECOND_CALC_IN_SECONDS 7200
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30 #define NINETY_NINE_MINUTES_IN_SECONDS 59940
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31
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32 # define PRESSURE_TEN_METER 1.0f
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33 # define PRESSURE_THREE_METER 0.333334f
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34 # define PRESSURE_150_CM 0.15f
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35 # define PRESSURE_HALF_METER 0.05f
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36
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37 static void buehlmann_backup_and_restore(_Bool backup_restore_otherwise);
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38 static float tissue_tolerance(void);
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39 static void ambient_bar_to_deco_stop_depth_bar(SDiveSettings *pDiveSettings, float ceiling);
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40 static int ascend_with_all_gaschanges(SDiveSettings *pDiveSettings, float pressure_decrease);
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41 static float next_stop_depth_input_is_actual_stop_id(SDiveSettings *pDiveSettings, int actual_id);
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42 static float get_gf_at_pressure(SDiveSettings *pDiveSettings, float pressure);
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43 static int buehlmann_calc_ndl(SDiveSettings *pDiveSettings);
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44 static _Bool dive1_check_deco(SDiveSettings *pDiveSettings);
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45
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46 static float gSurface_pressure_bar;
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47 static float gPressure;
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48 static int gGas_id;
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49 static float gTissue_nitrogen_bar[16];
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50 static float gTissue_helium_bar[16];
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51 static float gGF_value;
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52 static float gCNS;
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53
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54 float gGF_low_depth_bar;
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55 SStop gStop;
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56
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57 void buehlmann_init(void)
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58 {
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59 }
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60
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61 static void buehlmann_backup_and_restore(_Bool backup_restore_otherwise)
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62 {
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63 static float pressure;
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64 static float gas_id;
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65 static float tissue_nitrogen_bar[16];
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66 static float tissue_helium_bar[16];
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67 static float gf_value;
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68 static float cns;
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69
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70 if(backup_restore_otherwise)
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71 {
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72 pressure = gPressure;
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73 gas_id = gGas_id;
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74 gf_value = gGF_value;
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75 cns = gCNS;
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76 memcpy(tissue_nitrogen_bar, gTissue_nitrogen_bar, (4*16));
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77 memcpy(tissue_helium_bar, gTissue_helium_bar, (4*16));
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78 }
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79 else
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80 {
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81 gPressure = pressure;
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82 gGas_id = gas_id;
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83 gGF_value = gf_value;
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84 gCNS = cns;
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85 memcpy(gTissue_nitrogen_bar, tissue_nitrogen_bar, (4*16));
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86 memcpy(gTissue_helium_bar, tissue_helium_bar, (4*16));
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87 }
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88
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89 }
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90
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91 float buehlmann_get_gCNS(void)
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92 {
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93 return gCNS;
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94 }
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95
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96 void buehlmann_calc_deco(SLifeData* pLifeData, SDiveSettings * pDiveSettings, SDecoinfo * pDecoInfo)
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97 {
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98 float ceiling;
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99 int ascend_time;
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100 int tts_seconds;
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101 float pressure_delta;
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102 float next_depth;
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103 _Bool deco_reached = false;
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104 unsigned short *stoplist;
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105 int i;
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106
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107 gCNS = 0;
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108 pDecoInfo->output_time_to_surface_seconds = 0;
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109 pDecoInfo->output_ndl_seconds = 0;
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110 for(int i=0;i<DECOINFO_STRUCT_MAX_STOPS;i++)
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111 {
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112 pDecoInfo->output_stop_length_seconds[i] = 0;
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113 }
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114
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115 /* internal copying */
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116 gSurface_pressure_bar = pLifeData->pressure_surface_bar;
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117
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118 gPressure = pLifeData->pressure_ambient_bar;
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119 gGas_id = 0;
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120 memcpy(gTissue_nitrogen_bar, pLifeData->tissue_nitrogen_bar, (4*16));
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121 memcpy(gTissue_helium_bar, pLifeData->tissue_helium_bar, (4*16));
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122 gGF_value = ((float)pDiveSettings->gf_low) / 100.0f;
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123
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124 stoplist = pDecoInfo->output_stop_length_seconds;
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125
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126 if(pLifeData->dive_time_seconds_without_surface_time < 60)
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127 return;
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128
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129 // clean stop list
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130 for(i = 0; i < DECOINFO_STRUCT_MAX_STOPS; i++)
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131 stoplist[i] = 0;
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132
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133 if(pDiveSettings->internal__pressure_first_stop_ambient_bar_as_upper_limit_for_gf_low_otherwise_zero >= (gPressure - PRESSURE_150_CM))
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134 {
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135 deco_reached = true;
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136 }
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137
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138 gGF_value = ((float)pDiveSettings->gf_high) / 100.0f;
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139 buehlmann_backup_and_restore(true);
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140 if(!dive1_check_deco(pDiveSettings) )
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141 {
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142 buehlmann_backup_and_restore(false);
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143 // no deco
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144 pDecoInfo->output_time_to_surface_seconds = 0;
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145 for(i = 0; i < DECOINFO_STRUCT_MAX_STOPS; i++)
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146 pDecoInfo->output_stop_length_seconds[i] = 0;
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147 // calc NDL
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148 pDecoInfo->output_ndl_seconds = buehlmann_calc_ndl(pDiveSettings);;
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149 return;
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150 }
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151 buehlmann_backup_and_restore(false);
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152 pDecoInfo->output_ndl_seconds = 0;
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153
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154 gGF_value = get_gf_at_pressure(pDiveSettings, gPressure);
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155 //current ceiling at actual position
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156 ceiling = tissue_tolerance();
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157 ambient_bar_to_deco_stop_depth_bar(pDiveSettings, ceiling);
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158
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159 // set the base for all upcoming parameters
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160 ceiling = gStop.depth + gSurface_pressure_bar;
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161 tts_seconds = 0;
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162
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163 // modify parameters if there is ascend or parameter fine adjustment
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164 if(ceiling < (gPressure - PRESSURE_150_CM)) // more than 1.5 meter below ceiling
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165 {
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166 // ascend within 10 mtr to GF_low // speed 12 mtr/min -> 50 sec / 10 mtr; 15 sec / 3 mtr.
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167 if(ceiling < (gPressure - PRESSURE_TEN_METER) )
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168 { do {
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169 ascend_time = ascend_with_all_gaschanges(pDiveSettings, PRESSURE_TEN_METER);
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170 tts_seconds += ascend_time;
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171 ceiling = tissue_tolerance();
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172 if(tts_seconds > DECO_STOPS_MAX_TTS_CALCULATON_IN_SECONDS)
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173 {
254
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174 pDecoInfo->output_time_to_surface_seconds = NINETY_NINE_MINUTES_IN_SECONDS;
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175 return;// NINETY_NINE_MINUTES_IN_SECONDS;
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176 }
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177 } while ((ascend_time > 0 ) && ((gPressure - PRESSURE_TEN_METER ) > gSurface_pressure_bar) && (ceiling < (gPressure - PRESSURE_TEN_METER)));
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178 }
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179 do {
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180 buehlmann_backup_and_restore(true);
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181 ascend_time = ascend_with_all_gaschanges(pDiveSettings, PRESSURE_THREE_METER);
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182 tts_seconds += ascend_time;
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183 ceiling = tissue_tolerance();
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184 if(tts_seconds > DECO_STOPS_MAX_TTS_CALCULATON_IN_SECONDS)
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185 {
254
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186 pDecoInfo->output_time_to_surface_seconds = NINETY_NINE_MINUTES_IN_SECONDS;
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187 return;// NINETY_NINE_MINUTES_IN_SECONDS;
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188 }
255
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189 ambient_bar_to_deco_stop_depth_bar(pDiveSettings, ceiling);
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190 } while ((ascend_time > 0 ) && ((gStop.depth + gSurface_pressure_bar) < gPressure));
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191
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192 if(gStop.depth + gSurface_pressure_bar > gPressure)
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193 {
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194 gPressure += PRESSURE_THREE_METER;
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195 buehlmann_backup_and_restore(false);
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196 tts_seconds -= ascend_time;
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197 }
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198 // calculate first stop based on tissue saturation within 10 meters of stop
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199 //ambient_bar_to_deco_stop_depth_bar(ceiling);
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200 }
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201 else
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202 {
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203 // initial values, upper code might not be executed (is within 150 cm)
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204 }
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205
253
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206 if (ceiling > gSurface_pressure_bar)
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207 {
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208 ceiling = gStop.depth + gSurface_pressure_bar;
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209 // ascend the last meters to first stop (especially consider any gas changes around)
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210 pressure_delta = gPressure - ceiling;
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211 ascend_time = (int) ceil(pressure_delta * 50.0f);
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212 tts_seconds += ascend_with_all_gaschanges(pDiveSettings, pressure_delta);
253
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213 }
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214 // NDL check
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215 if(ceiling <= gSurface_pressure_bar)
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216 {
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217 // NDL with GF_low
254
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218 pDecoInfo->output_time_to_surface_seconds = 0;
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219 return;
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220 }
253
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221 if (ceiling > pDiveSettings->internal__pressure_first_stop_ambient_bar_as_upper_limit_for_gf_low_otherwise_zero)
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222 pDiveSettings->internal__pressure_first_stop_ambient_bar_as_upper_limit_for_gf_low_otherwise_zero = ceiling;
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223
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224 // calc gf loop
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225 if(deco_reached)
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226 gGF_low_depth_bar = pDiveSettings->internal__pressure_first_stop_ambient_bar_as_upper_limit_for_gf_low_otherwise_zero - gSurface_pressure_bar;
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227 else
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228 gGF_low_depth_bar = ceiling - gSurface_pressure_bar;
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229
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230 while(gStop.depth > 0)
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231 {
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232 do
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233 {
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234 next_depth = next_stop_depth_input_is_actual_stop_id(pDiveSettings, gStop.id);
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235 gGF_value = get_gf_at_pressure(pDiveSettings, next_depth + gSurface_pressure_bar);
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236 buehlmann_backup_and_restore(true);
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237 ascend_time = ascend_with_all_gaschanges(pDiveSettings, gStop.depth - next_depth);
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238 ceiling = tissue_tolerance();
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239 /* pre check actual limit */
258
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240 if(pDecoInfo->output_stop_length_seconds[gStop.id] >= 999*60)
38
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241 {
258
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242 tts_seconds -= 999*60 - pDecoInfo->output_stop_length_seconds[gStop.id];
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243 pDecoInfo->output_stop_length_seconds[gStop.id] = 999*60;
38
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244 }
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245 else
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246 /* more deco on the actual depth */
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247 if(ceiling > next_depth + gSurface_pressure_bar)
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248 {
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249 next_depth = -1;
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250 buehlmann_backup_and_restore(false);
255
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251 decom_tissues_exposure2(10, &pDiveSettings->decogaslist[gGas_id], gPressure,gTissue_nitrogen_bar,gTissue_helium_bar); // some seconds at least at each stop
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252 decom_oxygen_calculate_cns_exposure(10, &pDiveSettings->decogaslist[gGas_id], gPressure, &gCNS);
258
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253 pDecoInfo->output_stop_length_seconds[gStop.id] += 10;
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254 tts_seconds += 10;
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255 }
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256 } while(next_depth == -1);
253
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257 tts_seconds += ascend_time;
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258 gStop.depth = next_depth;
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259 for(i = gGas_id + 1; i < BUEHLMANN_STRUCT_MAX_GASES; i++)
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260 {
862
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261 if((pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero == 0)
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262 || (pDiveSettings->gas[pDiveSettings->decogaslist[i].GasIdInSettings].note.ub.decocalc == 0))
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263 {
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264 break;
862
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265 }
255
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266 float pressureChange = ((float)pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero) / 10;
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267 if(gStop.depth <= pressureChange + 0.00001f)
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268 {
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269 gGas_id = i;
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270 }
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271 else
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272 {
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273 break;
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274 }
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275 }
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276 gStop.id--;
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277 }
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278
258
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279 pDecoInfo->output_time_to_surface_seconds = tts_seconds;
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280 }
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281
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282
253
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283 static float tissue_tolerance(void)
38
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284 {
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285 float tissue_inertgas_saturation;
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286 float inertgas_a;
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287 float inertgas_b;
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288 float ceiling;
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289 float global_ceiling;
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290 int ci;
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291
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292 global_ceiling = -1;
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293
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294 for (ci = 0; ci < 16; ci++)
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295 {
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296 if(gTissue_helium_bar[ci] == 0)
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297 {
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298 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci];
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299 //
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300 inertgas_a = buehlmann_N2_a[ci];
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301 inertgas_b = buehlmann_N2_b[ci];
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302 }
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303 else
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304 {
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305 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci] + gTissue_helium_bar[ci];
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306 //
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307 inertgas_a = ( ( buehlmann_N2_a[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_a[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation;
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308 inertgas_b = ( ( buehlmann_N2_b[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_b[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation;
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309 }
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310 //
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311 ceiling = (inertgas_b * ( tissue_inertgas_saturation - gGF_value * inertgas_a ) ) / (gGF_value - (inertgas_b * gGF_value) + inertgas_b);
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312 if(ceiling > global_ceiling)
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313 global_ceiling = ceiling;
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314 }
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315 return global_ceiling;
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316 }
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317
246
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318 void buehlmann_super_saturation_calculator(SLifeData* pLifeData, SDecoinfo * pDecoInfo)
38
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319 {
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320 float tissue_inertgas_saturation;
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321 float inertgas_a;
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322 float inertgas_b;
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323 float ceiling;
246
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diff changeset
324 float super_saturation;
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325 float pres_respiration = pLifeData->pressure_ambient_bar;
38
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326 int ci;
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327
246
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diff changeset
328 pDecoInfo->super_saturation = 0;
38
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329
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330 for (ci = 0; ci < 16; ci++)
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331 {
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332 if(gTissue_helium_bar[ci] == 0)
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333 {
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334 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci];
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335 inertgas_a = buehlmann_N2_a[ci];
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336 inertgas_b = buehlmann_N2_b[ci];
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337 }
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338 else
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339 {
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340 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci] + gTissue_helium_bar[ci];
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341 inertgas_a = ( ( buehlmann_N2_a[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_a[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation;
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342 inertgas_b = ( ( buehlmann_N2_b[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_b[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation;
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343 }
246
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diff changeset
344
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345 ceiling = pres_respiration / inertgas_b + inertgas_a;
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346 if(tissue_inertgas_saturation > pres_respiration)
38
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347 {
246
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348 super_saturation =
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349 (tissue_inertgas_saturation - pres_respiration) / (ceiling - pres_respiration);
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350
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diff changeset
351 if (super_saturation > pDecoInfo->super_saturation)
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352 pDecoInfo->super_saturation = super_saturation;
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353 }
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354 }
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355 }
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356
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357
253
1663b3b204d7 Buehlmann: cleanup, whitespace, static
Jan Mulder <jlmulder@xs4all.nl>
parents: 250
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358 static float buehlmann_tissue_test_tolerance(float depth_in_bar_absolute)
38
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359 {
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360 float tissue_inertgas_saturation;
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361 float inertgas_a;
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362 float inertgas_b;
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363 float inertgas_tolerance;
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364 float gf_minus_1;
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365
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366 gf_minus_1 = gGF_value - 1.0f;
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367
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368 for (int ci = 0; ci < 16; ci++)
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369 {
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370 if(gTissue_helium_bar[ci] == 0)
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371 {
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372 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci];
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373 inertgas_a = buehlmann_N2_a[ci];
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374 inertgas_b = buehlmann_N2_b[ci];
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375 }
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376 else
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377 {
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378 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci] + gTissue_helium_bar[ci];
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379 inertgas_a = ( ( buehlmann_N2_a[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_a[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation;
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380 inertgas_b = ( ( buehlmann_N2_b[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_b[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation;
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381 }
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382 inertgas_tolerance = ( (gGF_value / inertgas_b - gf_minus_1) * depth_in_bar_absolute ) + ( gGF_value * inertgas_a );
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383 if(inertgas_tolerance < tissue_inertgas_saturation)
250
822416168585 Buelmann: new implementation for ceiling
Jan Mulder <jlmulder@xs4all.nl>
parents: 247
diff changeset
384 return tissue_inertgas_saturation - inertgas_tolerance; // positive
38
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385 }
250
822416168585 Buelmann: new implementation for ceiling
Jan Mulder <jlmulder@xs4all.nl>
parents: 247
diff changeset
386 return tissue_inertgas_saturation - inertgas_tolerance; // negative
38
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387 }
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388
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389
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
Jan Mulder <jlmulder@xs4all.nl>
parents: 254
diff changeset
390 static void ambient_bar_to_deco_stop_depth_bar(SDiveSettings *pDiveSettings, float ceiling)
38
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391 {
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392 int i;
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393
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394 ceiling -= gSurface_pressure_bar;
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395
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396 if(ceiling <= 0)
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397 {
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
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parents: 254
diff changeset
398 gStop.depth = pDiveSettings->last_stop_depth_bar;
38
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399 gStop.id = 0;
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400 return;
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parents:
diff changeset
401 }
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heinrichsweikamp
parents:
diff changeset
402
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
Jan Mulder <jlmulder@xs4all.nl>
parents: 254
diff changeset
403 if((ceiling - pDiveSettings->last_stop_depth_bar) <= 0)
38
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404 {
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
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parents: 254
diff changeset
405 gStop.depth = pDiveSettings->last_stop_depth_bar;
38
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heinrichsweikamp
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406 gStop.id = 0;
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heinrichsweikamp
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407 return;
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heinrichsweikamp
parents:
diff changeset
408 }
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heinrichsweikamp
parents:
diff changeset
409
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
Jan Mulder <jlmulder@xs4all.nl>
parents: 254
diff changeset
410 gStop.depth = pDiveSettings->input_second_to_last_stop_depth_bar;
38
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
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411 gStop.id = 1;
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
Jan Mulder <jlmulder@xs4all.nl>
parents: 254
diff changeset
412 ceiling -= pDiveSettings->input_second_to_last_stop_depth_bar;
38
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
413
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
414 if(ceiling <= 0)
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heinrichsweikamp
parents:
diff changeset
415 return;
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heinrichsweikamp
parents:
diff changeset
416
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heinrichsweikamp
parents:
diff changeset
417 for(i = 1; i < (DECOINFO_STRUCT_MAX_STOPS - 2); i++)
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heinrichsweikamp
parents:
diff changeset
418 {
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
Jan Mulder <jlmulder@xs4all.nl>
parents: 254
diff changeset
419 ceiling -= pDiveSettings->input_next_stop_increment_depth_bar;
38
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
420 if(ceiling <= 0)
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heinrichsweikamp
parents:
diff changeset
421 break;
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diff changeset
422 }
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
Jan Mulder <jlmulder@xs4all.nl>
parents: 254
diff changeset
423 gStop.depth += i * pDiveSettings->input_next_stop_increment_depth_bar;
38
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
424 gStop.id += i;
5f11787b4f42 include in ostc4 repository
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parents:
diff changeset
425 return;
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heinrichsweikamp
parents:
diff changeset
426 }
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
427
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
Jan Mulder <jlmulder@xs4all.nl>
parents: 254
diff changeset
428 static float next_stop_depth_input_is_actual_stop_id(SDiveSettings *pDiveSettings, int actual_id)
38
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
429 {
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heinrichsweikamp
parents:
diff changeset
430 if(actual_id == 0)
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heinrichsweikamp
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diff changeset
431 return 0;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
432
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
433 if(actual_id == 1)
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
Jan Mulder <jlmulder@xs4all.nl>
parents: 254
diff changeset
434 return pDiveSettings->last_stop_depth_bar;
38
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
435
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
436 actual_id -= 2;
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
Jan Mulder <jlmulder@xs4all.nl>
parents: 254
diff changeset
437 return pDiveSettings->input_second_to_last_stop_depth_bar + (actual_id * pDiveSettings->input_next_stop_increment_depth_bar);
38
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
438 }
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
439
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
Jan Mulder <jlmulder@xs4all.nl>
parents: 254
diff changeset
440 static int ascend_with_all_gaschanges(SDiveSettings *pDiveSettings, float pressure_decrease)
38
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heinrichsweikamp
parents:
diff changeset
441 {
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
442 float pressureTop, pressureTop_tmp, pressureBottom, pressureChange, ascendrate_in_seconds_for_one_bar, pressure_difference;
51
8f8ea3a32e82 Resolved warnings pointing to possible invalid memory access
Ideenmodellierer
parents: 38
diff changeset
443 int time_for_ascend = 0;
38
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
444 int seconds;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
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diff changeset
445 int i;
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heinrichsweikamp
parents:
diff changeset
446
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
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parents: 254
diff changeset
447 ascendrate_in_seconds_for_one_bar = 60 * 10 / pDiveSettings->ascentRate_meterperminute;
38
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
448
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heinrichsweikamp
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diff changeset
449 if(fabsf(gPressure - gSurface_pressure_bar) < PRESSURE_HALF_METER)
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heinrichsweikamp
parents:
diff changeset
450 {
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parents:
diff changeset
451 gPressure = gSurface_pressure_bar;
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parents:
diff changeset
452 return 0;
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heinrichsweikamp
parents:
diff changeset
453 }
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heinrichsweikamp
parents:
diff changeset
454
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
455 pressureTop = gPressure - pressure_decrease;
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heinrichsweikamp
parents:
diff changeset
456 if( gSurface_pressure_bar > pressureTop)
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heinrichsweikamp
parents:
diff changeset
457 pressureTop = gSurface_pressure_bar;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
458 pressureBottom = gPressure;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
459 seconds = 0;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
460 do{
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
461 pressureTop_tmp = pressureTop;
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heinrichsweikamp
parents:
diff changeset
462 for(i = gGas_id + 1; i < BUEHLMANN_STRUCT_MAX_GASES; i++)
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
463 {
862
974648b5ccfe Only use deco gas for calculation if option is enabled:
Ideenmodellierer
parents: 833
diff changeset
464 if((pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero == 0)
974648b5ccfe Only use deco gas for calculation if option is enabled:
Ideenmodellierer
parents: 833
diff changeset
465 || (pDiveSettings->gas[pDiveSettings->decogaslist[i].GasIdInSettings].note.ub.decocalc == 0))
974648b5ccfe Only use deco gas for calculation if option is enabled:
Ideenmodellierer
parents: 833
diff changeset
466 {
38
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
467 break;
862
974648b5ccfe Only use deco gas for calculation if option is enabled:
Ideenmodellierer
parents: 833
diff changeset
468 }
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
Jan Mulder <jlmulder@xs4all.nl>
parents: 254
diff changeset
469 pressureChange = gSurface_pressure_bar + ((float)pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero) / 10;
38
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heinrichsweikamp
parents:
diff changeset
470 if(pressureBottom <= pressureChange)
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
471 {
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heinrichsweikamp
parents:
diff changeset
472 gGas_id = i;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
473 }
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heinrichsweikamp
parents:
diff changeset
474 else
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heinrichsweikamp
parents:
diff changeset
475 {
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
476 break;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
477 }
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
478
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
479 }
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
480 for(i = gGas_id + 1; i < BUEHLMANN_STRUCT_MAX_GASES; i++)
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481 {
862
974648b5ccfe Only use deco gas for calculation if option is enabled:
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parents: 833
diff changeset
482 if((pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero == 0)
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parents: 833
diff changeset
483 || (pDiveSettings->gas[pDiveSettings->decogaslist[i].GasIdInSettings].note.ub.decocalc == 0))
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parents: 833
diff changeset
484 {
38
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485 break;
862
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diff changeset
486 }
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parents: 833
diff changeset
487
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diff changeset
488 pressureChange = gSurface_pressure_bar + ((float)pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero)/ 10;
38
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489 if((pressureChange < pressureBottom) && (pressureChange > pressureTop))
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490 {
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491 pressureTop_tmp = pressureChange;
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492 }
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493 }
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494 pressure_difference = pressureBottom - pressureTop_tmp;
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495 if(pressure_difference > 0.0001f)
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496 {
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497 time_for_ascend = (int)ceilf(pressure_difference * ascendrate_in_seconds_for_one_bar);
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diff changeset
498 decom_tissues_exposure_stage_schreiner(time_for_ascend, &pDiveSettings->decogaslist[gGas_id],
38
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499 pressureBottom, pressureTop_tmp, gTissue_nitrogen_bar, gTissue_helium_bar);
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diff changeset
500 decom_oxygen_calculate_cns_stage_SchreinerStyle(time_for_ascend,&pDiveSettings->decogaslist[gGas_id],
38
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501 pressureBottom, pressureTop_tmp, &gCNS);
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502 }
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503 pressureBottom = pressureTop_tmp;
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504 seconds += time_for_ascend;
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505 }while(pressureTop_tmp > pressureTop);
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506 gPressure = pressureTop;
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507 return seconds;
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508 }
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heinrichsweikamp
parents:
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509
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510
255
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parents: 254
diff changeset
511 static float get_gf_at_pressure(SDiveSettings *pDiveSettings, float pressure)
38
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512 {
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513 float gfSteigung = 0.0f;
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514
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515 if(gGF_low_depth_bar < 0)
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516 gGF_low_depth_bar = PRESSURE_THREE_METER; // just to prevent erratic behaviour if variable is not set
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517
255
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diff changeset
518 gfSteigung = ((float)(pDiveSettings->gf_high - pDiveSettings->gf_low))/ gGF_low_depth_bar;
38
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519
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520
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521 if((pressure - gSurface_pressure_bar) <= PRESSURE_HALF_METER)
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diff changeset
522 return ((float)pDiveSettings->gf_high) / 100.0f;
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523
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524 if(pressure >= gSurface_pressure_bar + gGF_low_depth_bar)
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diff changeset
525 return ((float)pDiveSettings->gf_low) / 100.0f;
38
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526
255
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diff changeset
527 return (pDiveSettings->gf_high - gfSteigung * (pressure - gSurface_pressure_bar) )/ 100.0f;
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528 }
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529
291
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parents: 261
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530 #define MAX_NDL 240
257
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531 static int buehlmann_calc_ndl(SDiveSettings *pDiveSettings)
38
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532 {
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533 float local_tissue_nitrogen_bar[16];
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534 float local_tissue_helium_bar[16];
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535 int i;
257
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parents: 256
diff changeset
536 int ndl = 0;
38
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537
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538 //Check ndl always use gHigh
255
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parents: 254
diff changeset
539 gGF_value = ((float)pDiveSettings->gf_high) / 100.0f;
38
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540 //10 minutes steps
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diff changeset
541 while(ndl < (MAX_NDL * 60))
38
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heinrichsweikamp
parents:
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542 {
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543 memcpy(local_tissue_nitrogen_bar, gTissue_nitrogen_bar, (4*16));
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diff changeset
544 memcpy(local_tissue_helium_bar, gTissue_helium_bar, (4*16));
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parents:
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545 //
257
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parents: 256
diff changeset
546 ndl += 600;
255
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parents: 254
diff changeset
547 decom_tissues_exposure2(600, &pDiveSettings->decogaslist[gGas_id], gPressure,gTissue_nitrogen_bar,gTissue_helium_bar);
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diff changeset
548 decom_oxygen_calculate_cns_exposure(600,&pDiveSettings->decogaslist[gGas_id],gPressure,&gCNS);
38
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parents:
diff changeset
549 buehlmann_backup_and_restore(true);
255
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diff changeset
550 if(dive1_check_deco(pDiveSettings))
38
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parents:
diff changeset
551 {
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diff changeset
552 buehlmann_backup_and_restore(false);
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heinrichsweikamp
parents:
diff changeset
553 break;
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parents:
diff changeset
554 }
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parents:
diff changeset
555 buehlmann_backup_and_restore(false);
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parents:
diff changeset
556 }
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parents:
diff changeset
557
291
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diff changeset
558 if(ndl < (MAX_NDL * 60))
257
21387d7e786f Buehlmann: factor out gNDL and gTTS
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parents: 256
diff changeset
559 ndl -= 600;
38
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parents:
diff changeset
560
291
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diff changeset
561 if(ndl > (MAX_NDL/2 * 60))
257
21387d7e786f Buehlmann: factor out gNDL and gTTS
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parents: 256
diff changeset
562 return ndl;
38
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563
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heinrichsweikamp
parents:
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564 // refine
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diff changeset
565 memcpy(gTissue_nitrogen_bar, local_tissue_nitrogen_bar, (4*16));
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parents:
diff changeset
566 memcpy(gTissue_helium_bar, local_tissue_helium_bar, (4*16));
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heinrichsweikamp
parents:
diff changeset
567
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parents:
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568 //One minutes step
256
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Jan Mulder <jlmulder@xs4all.nl>
parents: 255
diff changeset
569 for(i = 0; i < 10; i++)
38
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570 {
257
21387d7e786f Buehlmann: factor out gNDL and gTTS
Jan Mulder <jlmulder@xs4all.nl>
parents: 256
diff changeset
571 ndl += 60;
255
dcf7a3435fe1 Buehlmann: cleanup, factor out pBuDiveSettings
Jan Mulder <jlmulder@xs4all.nl>
parents: 254
diff changeset
572 decom_tissues_exposure2(60, &pDiveSettings->decogaslist[gGas_id], gPressure,gTissue_nitrogen_bar,gTissue_helium_bar);
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parents: 254
diff changeset
573 decom_oxygen_calculate_cns_exposure(60,&pDiveSettings->decogaslist[gGas_id],gPressure,&gCNS);
38
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574 buehlmann_backup_and_restore(true);
255
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parents: 254
diff changeset
575 if(dive1_check_deco(pDiveSettings))
38
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parents:
diff changeset
576 break;
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parents:
diff changeset
577 buehlmann_backup_and_restore(false);
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578 }
257
21387d7e786f Buehlmann: factor out gNDL and gTTS
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parents: 256
diff changeset
579 return ndl;
38
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parents:
diff changeset
580 }
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heinrichsweikamp
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diff changeset
581
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diff changeset
582
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parents:
diff changeset
583 // ===============================================================================
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diff changeset
584 // dive1_check_deco
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parents:
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585 /// @brief for NDL calculations
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586 /// 160614 using ceilingOther and not ceiling
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587 // ===============================================================================
255
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588 static _Bool dive1_check_deco(SDiveSettings *pDiveSettings)
38
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parents:
diff changeset
589 {
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parents:
diff changeset
590 // gGF_value is set in call routine;
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heinrichsweikamp
parents:
diff changeset
591 // internes Backup!
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parents:
diff changeset
592
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heinrichsweikamp
parents:
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593 // calc like in deco
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parents:
diff changeset
594 float ceiling;
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parents:
diff changeset
595 float ceilingOther; // new hw 160614
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parents:
diff changeset
596
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parents:
diff changeset
597 ceiling = tissue_tolerance();
255
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Jan Mulder <jlmulder@xs4all.nl>
parents: 254
diff changeset
598 ambient_bar_to_deco_stop_depth_bar(pDiveSettings, ceiling); // this will set gStop.depth :-) (and gStop.id)
38
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heinrichsweikamp
parents:
diff changeset
599
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heinrichsweikamp
parents:
diff changeset
600 // set the base for all upcoming parameters
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parents:
diff changeset
601 ceilingOther = gStop.depth + gSurface_pressure_bar;
5f11787b4f42 include in ostc4 repository
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parents:
diff changeset
602
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parents:
diff changeset
603 // modify parameters if there is ascend or parameter fine adjustment
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heinrichsweikamp
parents:
diff changeset
604 if(ceilingOther < (gPressure - PRESSURE_150_CM)) // more than 1.5 meter below ceiling
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heinrichsweikamp
parents:
diff changeset
605 {
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parents:
diff changeset
606 // ascend within 10 mtr to GF_low // speed 12 mtr/min -> 50 sec / 10 mtr; 15 sec / 3 mtr.
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parents:
diff changeset
607 while(((gPressure - PRESSURE_TEN_METER ) > gSurface_pressure_bar) && (ceiling < (gPressure - PRESSURE_TEN_METER)))
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parents:
diff changeset
608 {
255
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parents: 254
diff changeset
609 ascend_with_all_gaschanges(pDiveSettings, PRESSURE_TEN_METER);
38
5f11787b4f42 include in ostc4 repository
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parents:
diff changeset
610 ceiling = tissue_tolerance();
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heinrichsweikamp
parents:
diff changeset
611 }
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parents:
diff changeset
612 while(((gPressure - PRESSURE_THREE_METER )> gSurface_pressure_bar) && (ceiling < gPressure))
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parents:
diff changeset
613 {
255
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parents: 254
diff changeset
614 ascend_with_all_gaschanges(pDiveSettings, PRESSURE_THREE_METER);
38
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parents:
diff changeset
615 ceiling = tissue_tolerance();
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parents:
diff changeset
616 }
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diff changeset
617 }
255
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diff changeset
618 return ceiling > gSurface_pressure_bar;
38
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parents:
diff changeset
619 }
5f11787b4f42 include in ostc4 repository
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diff changeset
620
250
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diff changeset
621 // compute ceiling recursively, with a resolution of 10cm. Notice
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diff changeset
622 // that the initial call shall guarantee that the found ceiling
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623 // is between low and high parameters.
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diff changeset
624 static float compute_ceiling(float low, float high)
38
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625 {
250
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parents: 247
diff changeset
626 if ((high - low) < 0.01)
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parents: 247
diff changeset
627 return low;
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parents: 247
diff changeset
628 else {
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diff changeset
629 float next_pressure_absolute = (low + high)/2;
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diff changeset
630 float test_result = buehlmann_tissue_test_tolerance(next_pressure_absolute);
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parents: 247
diff changeset
631 if (test_result < 0)
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parents: 247
diff changeset
632 return compute_ceiling(low, next_pressure_absolute);
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diff changeset
633 else
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diff changeset
634 return compute_ceiling(next_pressure_absolute, high);
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635 }
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636 }
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637
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638 void buehlmann_ceiling_calculator(SLifeData *pLifeData, SDecoinfo *pDecoInfo)
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639 {
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640 float ceiling;
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641
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642 memcpy(gTissue_nitrogen_bar, pLifeData->tissue_nitrogen_bar, (4*16));
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643 memcpy(gTissue_helium_bar, pLifeData->tissue_helium_bar, (4*16));
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644
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645 // this is just performance optimizing. The code below runs just fine
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646 // without this. There is never a ceiling in NDL deco state
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647 if (!pDecoInfo->output_time_to_surface_seconds) {
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648 pDecoInfo->output_ceiling_meter = 0;
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649 return;
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650 }
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651
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652 ceiling = compute_ceiling(pLifeData->pressure_surface_bar, 1.0f + pLifeData->max_depth_meter/10.0f);
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653 pDecoInfo->output_ceiling_meter = (ceiling - pLifeData->pressure_surface_bar) * 10.0f;
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654 }