Mercurial > public > ostc4
annotate Discovery/Src/buehlmann.c @ 747:df0d43da1614
Added pressure compensation to CO2 detection:
A pressure compensation is needed if the ExplorIR shall be used under extended pressure conditions. The procedure recommended by the application note has been integrated. To keep things simple the focus of the CO2 measurement is not the precision, as it is needed for the decompression calculation, but the indication of a critical increase of CO2 in the breathing loop. That's why only a lookup table with 1000ppm steps has been implemented instead of calculating the polynom for every measurement.
| author | Ideenmodellierer |
|---|---|
| date | Sun, 05 Mar 2023 22:06:47 +0100 |
| parents | 305f251cc981 |
| children | b7d93ff6b3b2 |
| rev | line source |
|---|---|
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1 /* getrennte Gase f�r die verschiedenen Modi |
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2 um Gaswechsel Eintr�ge zu vereinfachen |
| 38 | 3 das heisst: |
| 4 oc == bailout in cc mode | |
| 5 */ | |
| 6 | |
| 7 /* Konvention: | |
| 8 float extExample_variable_can_be_used_with_extern; | |
| 9 */ | |
| 10 | |
| 11 #include <string.h> | |
| 12 #include <math.h> | |
| 13 #include <stdbool.h> | |
| 14 #include "buehlmann.h" | |
| 15 #include "decom.h" | |
| 16 | |
| 17 extern const float buehlmann_N2_a[]; | |
| 18 extern const float buehlmann_N2_b[]; | |
| 19 extern const float buehlmann_He_a[]; | |
| 20 extern const float buehlmann_He_b[]; | |
| 21 | |
| 22 typedef struct | |
| 23 { | |
| 24 float depth; | |
| 25 int id; | |
| 26 } SStop; | |
| 27 | |
| 28 #define DECO_STOPS_MAX_TTS_CALCULATON_IN_SECONDS 59940 // 999 minuten; before: 18000 // 5(h) * 60(min) * 60 sec = 18000 sec | |
| 29 #define DECO_STOPS_MAX_TTS_FOR_EVERY_SECOND_CALC_IN_SECONDS 7200 | |
| 30 #define NINETY_NINE_MINUTES_IN_SECONDS 59940 | |
| 31 | |
| 32 # define PRESSURE_TEN_METER 1.0f | |
| 33 # define PRESSURE_THREE_METER 0.333334f | |
| 34 # define PRESSURE_150_CM 0.15f | |
| 35 # define PRESSURE_HALF_METER 0.05f | |
| 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); |
| 38 | 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; |
| 38 | 53 |
| 54 float gGF_low_depth_bar; | |
| 55 SStop gStop; | |
| 56 | |
| 57 void buehlmann_init(void) | |
| 58 { | |
| 59 } | |
| 60 | |
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61 static void buehlmann_backup_and_restore(_Bool backup_restore_otherwise) |
| 38 | 62 { |
| 63 static float pressure; | |
| 64 static float gas_id; | |
| 65 static float tissue_nitrogen_bar[16]; | |
| 66 static float tissue_helium_bar[16]; | |
| 67 static float gf_value; | |
| 68 static float cns; | |
| 69 | |
| 70 if(backup_restore_otherwise) | |
| 71 { | |
| 72 pressure = gPressure; | |
| 73 gas_id = gGas_id; | |
| 74 gf_value = gGF_value; | |
| 75 cns = gCNS; | |
| 76 memcpy(tissue_nitrogen_bar, gTissue_nitrogen_bar, (4*16)); | |
| 77 memcpy(tissue_helium_bar, gTissue_helium_bar, (4*16)); | |
| 78 } | |
| 79 else | |
| 80 { | |
| 81 gPressure = pressure; | |
| 82 gGas_id = gas_id; | |
| 83 gGF_value = gf_value; | |
| 84 gCNS = cns; | |
| 85 memcpy(gTissue_nitrogen_bar, tissue_nitrogen_bar, (4*16)); | |
| 86 memcpy(gTissue_helium_bar, tissue_helium_bar, (4*16)); | |
| 87 } | |
| 88 | |
| 89 } | |
| 90 | |
| 91 float buehlmann_get_gCNS(void) | |
| 92 { | |
| 93 return gCNS; | |
| 94 } | |
| 95 | |
| 96 void buehlmann_calc_deco(SLifeData* pLifeData, SDiveSettings * pDiveSettings, SDecoinfo * pDecoInfo) | |
| 97 { | |
| 98 float ceiling; | |
| 99 int ascend_time; | |
| 100 int tts_seconds; | |
| 101 float pressure_delta; | |
| 102 float next_depth; | |
| 103 _Bool deco_reached = false; | |
| 104 unsigned short *stoplist; | |
| 105 int i; | |
| 106 | |
| 107 gCNS = 0; | |
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108 pDecoInfo->output_time_to_surface_seconds = 0; |
| 38 | 109 pDecoInfo->output_ndl_seconds = 0; |
| 110 for(int i=0;i<DECOINFO_STRUCT_MAX_STOPS;i++) | |
| 111 { | |
| 112 pDecoInfo->output_stop_length_seconds[i] = 0; | |
| 113 } | |
| 114 | |
| 115 /* internal copying */ | |
| 116 gSurface_pressure_bar = pLifeData->pressure_surface_bar; | |
| 117 | |
| 118 gPressure = pLifeData->pressure_ambient_bar; | |
| 119 gGas_id = 0; | |
| 120 memcpy(gTissue_nitrogen_bar, pLifeData->tissue_nitrogen_bar, (4*16)); | |
| 121 memcpy(gTissue_helium_bar, pLifeData->tissue_helium_bar, (4*16)); | |
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122 gGF_value = ((float)pDiveSettings->gf_low) / 100.0f; |
| 38 | 123 |
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124 stoplist = pDecoInfo->output_stop_length_seconds; |
| 38 | 125 |
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126 if(pLifeData->dive_time_seconds_without_surface_time < 60) |
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127 return; |
| 38 | 128 |
| 129 // clean stop list | |
| 130 for(i = 0; i < DECOINFO_STRUCT_MAX_STOPS; i++) | |
| 131 stoplist[i] = 0; | |
| 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 } |
| 38 | 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) ) |
| 38 | 141 { |
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142 buehlmann_backup_and_restore(false); |
| 38 | 143 // no deco |
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144 pDecoInfo->output_time_to_surface_seconds = 0; |
| 38 | 145 for(i = 0; i < DECOINFO_STRUCT_MAX_STOPS; i++) |
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146 pDecoInfo->output_stop_length_seconds[i] = 0; |
| 38 | 147 // calc NDL |
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148 pDecoInfo->output_ndl_seconds = buehlmann_calc_ndl(pDiveSettings);; |
| 38 | 149 return; |
| 150 } | |
| 151 buehlmann_backup_and_restore(false); | |
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152 pDecoInfo->output_ndl_seconds = 0; |
| 38 | 153 |
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154 gGF_value = get_gf_at_pressure(pDiveSettings, gPressure); |
| 38 | 155 //current ceiling at actual position |
| 156 ceiling = tissue_tolerance(); | |
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157 ambient_bar_to_deco_stop_depth_bar(pDiveSettings, ceiling); |
| 38 | 158 |
| 159 // set the base for all upcoming parameters | |
| 160 ceiling = gStop.depth + gSurface_pressure_bar; | |
| 161 tts_seconds = 0; | |
| 162 | |
| 163 // modify parameters if there is ascend or parameter fine adjustment | |
| 164 if(ceiling < (gPressure - PRESSURE_150_CM)) // more than 1.5 meter below ceiling | |
| 165 { | |
| 166 // ascend within 10 mtr to GF_low // speed 12 mtr/min -> 50 sec / 10 mtr; 15 sec / 3 mtr. | |
| 167 if(ceiling < (gPressure - PRESSURE_TEN_METER) ) | |
| 168 { do { | |
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169 ascend_time = ascend_with_all_gaschanges(pDiveSettings, PRESSURE_TEN_METER); |
| 38 | 170 tts_seconds += ascend_time; |
| 171 ceiling = tissue_tolerance(); | |
| 172 if(tts_seconds > DECO_STOPS_MAX_TTS_CALCULATON_IN_SECONDS) | |
| 173 { | |
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174 pDecoInfo->output_time_to_surface_seconds = NINETY_NINE_MINUTES_IN_SECONDS; |
| 38 | 175 return;// NINETY_NINE_MINUTES_IN_SECONDS; |
| 176 } | |
| 177 } while ((ascend_time > 0 ) && ((gPressure - PRESSURE_TEN_METER ) > gSurface_pressure_bar) && (ceiling < (gPressure - PRESSURE_TEN_METER))); | |
| 178 } | |
| 179 do { | |
| 180 buehlmann_backup_and_restore(true); | |
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181 ascend_time = ascend_with_all_gaschanges(pDiveSettings, PRESSURE_THREE_METER); |
| 38 | 182 tts_seconds += ascend_time; |
| 183 ceiling = tissue_tolerance(); | |
| 184 if(tts_seconds > DECO_STOPS_MAX_TTS_CALCULATON_IN_SECONDS) | |
| 185 { | |
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186 pDecoInfo->output_time_to_surface_seconds = NINETY_NINE_MINUTES_IN_SECONDS; |
| 38 | 187 return;// NINETY_NINE_MINUTES_IN_SECONDS; |
| 188 } | |
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189 ambient_bar_to_deco_stop_depth_bar(pDiveSettings, ceiling); |
| 38 | 190 } while ((ascend_time > 0 ) && ((gStop.depth + gSurface_pressure_bar) < gPressure)); |
| 191 | |
| 192 if(gStop.depth + gSurface_pressure_bar > gPressure) | |
| 193 { | |
| 194 gPressure += PRESSURE_THREE_METER; | |
| 195 buehlmann_backup_and_restore(false); | |
| 196 tts_seconds -= ascend_time; | |
| 197 } | |
| 198 // calculate first stop based on tissue saturation within 10 meters of stop | |
| 199 //ambient_bar_to_deco_stop_depth_bar(ceiling); | |
| 200 } | |
| 201 else | |
| 202 { | |
| 203 // initial values, upper code might not be executed (is within 150 cm) | |
| 204 } | |
| 205 | |
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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); |
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213 } |
| 38 | 214 // NDL check |
| 215 if(ceiling <= gSurface_pressure_bar) | |
| 216 { | |
| 217 // NDL with GF_low | |
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218 pDecoInfo->output_time_to_surface_seconds = 0; |
| 38 | 219 return; |
| 220 } | |
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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; |
| 38 | 223 |
| 224 // calc gf loop | |
| 225 if(deco_reached) | |
| 226 gGF_low_depth_bar = pDiveSettings->internal__pressure_first_stop_ambient_bar_as_upper_limit_for_gf_low_otherwise_zero - gSurface_pressure_bar; | |
| 227 else | |
| 228 gGF_low_depth_bar = ceiling - gSurface_pressure_bar; | |
| 229 | |
| 230 while(gStop.depth > 0) | |
| 231 { | |
| 232 do | |
| 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); |
| 38 | 236 buehlmann_backup_and_restore(true); |
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237 ascend_time = ascend_with_all_gaschanges(pDiveSettings, gStop.depth - next_depth); |
| 38 | 238 ceiling = tissue_tolerance(); |
| 239 /* pre check actual limit */ | |
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240 if(pDecoInfo->output_stop_length_seconds[gStop.id] >= 999*60) |
| 38 | 241 { |
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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 | 244 } |
| 245 else | |
| 246 /* more deco on the actual depth */ | |
| 247 if(ceiling > next_depth + gSurface_pressure_bar) | |
| 248 { | |
| 249 next_depth = -1; | |
| 250 buehlmann_backup_and_restore(false); | |
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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); |
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253 pDecoInfo->output_stop_length_seconds[gStop.id] += 10; |
| 38 | 254 tts_seconds += 10; |
| 255 } | |
| 256 } while(next_depth == -1); | |
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257 tts_seconds += ascend_time; |
| 38 | 258 gStop.depth = next_depth; |
| 259 for(i = gGas_id + 1; i < BUEHLMANN_STRUCT_MAX_GASES; i++) | |
| 260 { | |
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261 if(pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero == 0) |
| 38 | 262 break; |
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263 float pressureChange = ((float)pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero) / 10; |
| 38 | 264 if(gStop.depth <= pressureChange + 0.00001f) |
| 265 { | |
| 266 gGas_id = i; | |
| 267 } | |
| 268 else | |
| 269 { | |
| 270 break; | |
| 271 } | |
| 272 } | |
| 273 gStop.id--; | |
| 274 } | |
| 275 | |
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276 pDecoInfo->output_time_to_surface_seconds = tts_seconds; |
| 38 | 277 } |
| 278 | |
| 279 | |
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280 static float tissue_tolerance(void) |
| 38 | 281 { |
| 282 float tissue_inertgas_saturation; | |
| 283 float inertgas_a; | |
| 284 float inertgas_b; | |
| 285 float ceiling; | |
| 286 float global_ceiling; | |
| 287 int ci; | |
| 288 | |
| 289 global_ceiling = -1; | |
| 290 | |
| 291 for (ci = 0; ci < 16; ci++) | |
| 292 { | |
| 293 if(gTissue_helium_bar[ci] == 0) | |
| 294 { | |
| 295 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci]; | |
| 296 // | |
| 297 inertgas_a = buehlmann_N2_a[ci]; | |
| 298 inertgas_b = buehlmann_N2_b[ci]; | |
| 299 } | |
| 300 else | |
| 301 { | |
| 302 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci] + gTissue_helium_bar[ci]; | |
| 303 // | |
| 304 inertgas_a = ( ( buehlmann_N2_a[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_a[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 305 inertgas_b = ( ( buehlmann_N2_b[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_b[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 306 } | |
| 307 // | |
| 308 ceiling = (inertgas_b * ( tissue_inertgas_saturation - gGF_value * inertgas_a ) ) / (gGF_value - (inertgas_b * gGF_value) + inertgas_b); | |
| 309 if(ceiling > global_ceiling) | |
| 310 global_ceiling = ceiling; | |
| 311 } | |
| 312 return global_ceiling; | |
| 313 } | |
| 314 | |
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315 void buehlmann_super_saturation_calculator(SLifeData* pLifeData, SDecoinfo * pDecoInfo) |
| 38 | 316 { |
| 317 float tissue_inertgas_saturation; | |
| 318 float inertgas_a; | |
| 319 float inertgas_b; | |
| 320 float ceiling; | |
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321 float super_saturation; |
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322 float pres_respiration = pLifeData->pressure_ambient_bar; |
| 38 | 323 int ci; |
| 324 | |
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325 pDecoInfo->super_saturation = 0; |
| 38 | 326 |
| 327 for (ci = 0; ci < 16; ci++) | |
| 328 { | |
| 329 if(gTissue_helium_bar[ci] == 0) | |
| 330 { | |
| 331 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci]; | |
| 332 inertgas_a = buehlmann_N2_a[ci]; | |
| 333 inertgas_b = buehlmann_N2_b[ci]; | |
| 334 } | |
| 335 else | |
| 336 { | |
| 337 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci] + gTissue_helium_bar[ci]; | |
| 338 inertgas_a = ( ( buehlmann_N2_a[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_a[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 339 inertgas_b = ( ( buehlmann_N2_b[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_b[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 340 } | |
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341 |
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342 ceiling = pres_respiration / inertgas_b + inertgas_a; |
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343 if(tissue_inertgas_saturation > pres_respiration) |
| 38 | 344 { |
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345 super_saturation = |
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346 (tissue_inertgas_saturation - pres_respiration) / (ceiling - pres_respiration); |
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347 |
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348 if (super_saturation > pDecoInfo->super_saturation) |
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349 pDecoInfo->super_saturation = super_saturation; |
| 38 | 350 } |
| 351 } | |
| 352 } | |
| 353 | |
| 354 | |
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355 static float buehlmann_tissue_test_tolerance(float depth_in_bar_absolute) |
| 38 | 356 { |
| 357 float tissue_inertgas_saturation; | |
| 358 float inertgas_a; | |
| 359 float inertgas_b; | |
| 360 float inertgas_tolerance; | |
| 361 float gf_minus_1; | |
| 362 | |
| 363 gf_minus_1 = gGF_value - 1.0f; | |
| 364 | |
| 365 for (int ci = 0; ci < 16; ci++) | |
| 366 { | |
| 367 if(gTissue_helium_bar[ci] == 0) | |
| 368 { | |
| 369 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci]; | |
| 370 inertgas_a = buehlmann_N2_a[ci]; | |
| 371 inertgas_b = buehlmann_N2_b[ci]; | |
| 372 } | |
| 373 else | |
| 374 { | |
| 375 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci] + gTissue_helium_bar[ci]; | |
| 376 inertgas_a = ( ( buehlmann_N2_a[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_a[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 377 inertgas_b = ( ( buehlmann_N2_b[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_b[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 378 } | |
| 379 inertgas_tolerance = ( (gGF_value / inertgas_b - gf_minus_1) * depth_in_bar_absolute ) + ( gGF_value * inertgas_a ); | |
| 380 if(inertgas_tolerance < tissue_inertgas_saturation) | |
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381 return tissue_inertgas_saturation - inertgas_tolerance; // positive |
| 38 | 382 } |
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383 return tissue_inertgas_saturation - inertgas_tolerance; // negative |
| 38 | 384 } |
| 385 | |
| 386 | |
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387 static void ambient_bar_to_deco_stop_depth_bar(SDiveSettings *pDiveSettings, float ceiling) |
| 38 | 388 { |
| 389 int i; | |
| 390 | |
| 391 ceiling -= gSurface_pressure_bar; | |
| 392 | |
| 393 if(ceiling <= 0) | |
| 394 { | |
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395 gStop.depth = pDiveSettings->last_stop_depth_bar; |
| 38 | 396 gStop.id = 0; |
| 397 return; | |
| 398 } | |
| 399 | |
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400 if((ceiling - pDiveSettings->last_stop_depth_bar) <= 0) |
| 38 | 401 { |
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402 gStop.depth = pDiveSettings->last_stop_depth_bar; |
| 38 | 403 gStop.id = 0; |
| 404 return; | |
| 405 } | |
| 406 | |
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407 gStop.depth = pDiveSettings->input_second_to_last_stop_depth_bar; |
| 38 | 408 gStop.id = 1; |
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409 ceiling -= pDiveSettings->input_second_to_last_stop_depth_bar; |
| 38 | 410 |
| 411 if(ceiling <= 0) | |
| 412 return; | |
| 413 | |
| 414 for(i = 1; i < (DECOINFO_STRUCT_MAX_STOPS - 2); i++) | |
| 415 { | |
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416 ceiling -= pDiveSettings->input_next_stop_increment_depth_bar; |
| 38 | 417 if(ceiling <= 0) |
| 418 break; | |
| 419 } | |
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420 gStop.depth += i * pDiveSettings->input_next_stop_increment_depth_bar; |
| 38 | 421 gStop.id += i; |
| 422 return; | |
| 423 } | |
| 424 | |
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425 static float next_stop_depth_input_is_actual_stop_id(SDiveSettings *pDiveSettings, int actual_id) |
| 38 | 426 { |
| 427 if(actual_id == 0) | |
| 428 return 0; | |
| 429 | |
| 430 if(actual_id == 1) | |
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431 return pDiveSettings->last_stop_depth_bar; |
| 38 | 432 |
| 433 actual_id -= 2; | |
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434 return pDiveSettings->input_second_to_last_stop_depth_bar + (actual_id * pDiveSettings->input_next_stop_increment_depth_bar); |
| 38 | 435 } |
| 436 | |
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437 static int ascend_with_all_gaschanges(SDiveSettings *pDiveSettings, float pressure_decrease) |
| 38 | 438 { |
| 439 float pressureTop, pressureTop_tmp, pressureBottom, pressureChange, ascendrate_in_seconds_for_one_bar, pressure_difference; | |
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440 int time_for_ascend = 0; |
| 38 | 441 int seconds; |
| 442 int i; | |
| 443 | |
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444 ascendrate_in_seconds_for_one_bar = 60 * 10 / pDiveSettings->ascentRate_meterperminute; |
| 38 | 445 |
| 446 if(fabsf(gPressure - gSurface_pressure_bar) < PRESSURE_HALF_METER) | |
| 447 { | |
| 448 gPressure = gSurface_pressure_bar; | |
| 449 return 0; | |
| 450 } | |
| 451 | |
| 452 pressureTop = gPressure - pressure_decrease; | |
| 453 if( gSurface_pressure_bar > pressureTop) | |
| 454 pressureTop = gSurface_pressure_bar; | |
| 455 pressureBottom = gPressure; | |
| 456 seconds = 0; | |
| 457 do{ | |
| 458 pressureTop_tmp = pressureTop; | |
| 459 for(i = gGas_id + 1; i < BUEHLMANN_STRUCT_MAX_GASES; i++) | |
| 460 { | |
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461 if(pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero == 0) |
| 38 | 462 break; |
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463 pressureChange = gSurface_pressure_bar + ((float)pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero) / 10; |
| 38 | 464 if(pressureBottom <= pressureChange) |
| 465 { | |
| 466 gGas_id = i; | |
| 467 } | |
| 468 else | |
| 469 { | |
| 470 break; | |
| 471 } | |
| 472 | |
| 473 } | |
| 474 for(i = gGas_id + 1; i < BUEHLMANN_STRUCT_MAX_GASES; i++) | |
| 475 { | |
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476 if(pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero == 0) |
| 38 | 477 break; |
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478 pressureChange = gSurface_pressure_bar + ((float)pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero)/ 10; |
| 38 | 479 if((pressureChange < pressureBottom) && (pressureChange > pressureTop)) |
| 480 { | |
| 481 pressureTop_tmp = pressureChange; | |
| 482 } | |
| 483 } | |
| 484 pressure_difference = pressureBottom - pressureTop_tmp; | |
| 485 if(pressure_difference > 0.0001f) | |
| 486 { | |
| 487 time_for_ascend = (int)ceilf(pressure_difference * ascendrate_in_seconds_for_one_bar); | |
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488 decom_tissues_exposure_stage_schreiner(time_for_ascend, &pDiveSettings->decogaslist[gGas_id], |
| 38 | 489 pressureBottom, pressureTop_tmp, gTissue_nitrogen_bar, gTissue_helium_bar); |
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490 decom_oxygen_calculate_cns_stage_SchreinerStyle(time_for_ascend,&pDiveSettings->decogaslist[gGas_id], |
| 38 | 491 pressureBottom, pressureTop_tmp, &gCNS); |
| 492 } | |
| 493 pressureBottom = pressureTop_tmp; | |
| 494 seconds += time_for_ascend; | |
| 495 }while(pressureTop_tmp > pressureTop); | |
| 496 gPressure = pressureTop; | |
| 497 return seconds; | |
| 498 } | |
| 499 | |
| 500 | |
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501 static float get_gf_at_pressure(SDiveSettings *pDiveSettings, float pressure) |
| 38 | 502 { |
| 503 float gfSteigung = 0.0f; | |
| 504 | |
| 505 if(gGF_low_depth_bar < 0) | |
| 506 gGF_low_depth_bar = PRESSURE_THREE_METER; // just to prevent erratic behaviour if variable is not set | |
| 507 | |
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508 gfSteigung = ((float)(pDiveSettings->gf_high - pDiveSettings->gf_low))/ gGF_low_depth_bar; |
| 38 | 509 |
| 510 | |
| 511 if((pressure - gSurface_pressure_bar) <= PRESSURE_HALF_METER) | |
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512 return ((float)pDiveSettings->gf_high) / 100.0f; |
| 38 | 513 |
| 514 if(pressure >= gSurface_pressure_bar + gGF_low_depth_bar) | |
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515 return ((float)pDiveSettings->gf_low) / 100.0f; |
| 38 | 516 |
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517 return (pDiveSettings->gf_high - gfSteigung * (pressure - gSurface_pressure_bar) )/ 100.0f; |
| 38 | 518 } |
| 519 | |
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520 #define MAX_NDL 240 |
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521 static int buehlmann_calc_ndl(SDiveSettings *pDiveSettings) |
| 38 | 522 { |
| 523 float local_tissue_nitrogen_bar[16]; | |
| 524 float local_tissue_helium_bar[16]; | |
| 525 int i; | |
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526 int ndl = 0; |
| 38 | 527 |
| 528 //Check ndl always use gHigh | |
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529 gGF_value = ((float)pDiveSettings->gf_high) / 100.0f; |
| 38 | 530 //10 minutes steps |
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531 while(ndl < (MAX_NDL * 60)) |
| 38 | 532 { |
| 533 memcpy(local_tissue_nitrogen_bar, gTissue_nitrogen_bar, (4*16)); | |
| 534 memcpy(local_tissue_helium_bar, gTissue_helium_bar, (4*16)); | |
| 535 // | |
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536 ndl += 600; |
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537 decom_tissues_exposure2(600, &pDiveSettings->decogaslist[gGas_id], gPressure,gTissue_nitrogen_bar,gTissue_helium_bar); |
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538 decom_oxygen_calculate_cns_exposure(600,&pDiveSettings->decogaslist[gGas_id],gPressure,&gCNS); |
| 38 | 539 buehlmann_backup_and_restore(true); |
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540 if(dive1_check_deco(pDiveSettings)) |
| 38 | 541 { |
| 542 buehlmann_backup_and_restore(false); | |
| 543 break; | |
| 544 } | |
| 545 buehlmann_backup_and_restore(false); | |
| 546 } | |
| 547 | |
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548 if(ndl < (MAX_NDL * 60)) |
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549 ndl -= 600; |
| 38 | 550 |
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551 if(ndl > (MAX_NDL/2 * 60)) |
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552 return ndl; |
| 38 | 553 |
| 554 // refine | |
| 555 memcpy(gTissue_nitrogen_bar, local_tissue_nitrogen_bar, (4*16)); | |
| 556 memcpy(gTissue_helium_bar, local_tissue_helium_bar, (4*16)); | |
| 557 | |
| 558 //One minutes step | |
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559 for(i = 0; i < 10; i++) |
| 38 | 560 { |
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561 ndl += 60; |
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562 decom_tissues_exposure2(60, &pDiveSettings->decogaslist[gGas_id], gPressure,gTissue_nitrogen_bar,gTissue_helium_bar); |
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563 decom_oxygen_calculate_cns_exposure(60,&pDiveSettings->decogaslist[gGas_id],gPressure,&gCNS); |
| 38 | 564 buehlmann_backup_and_restore(true); |
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565 if(dive1_check_deco(pDiveSettings)) |
| 38 | 566 break; |
| 567 buehlmann_backup_and_restore(false); | |
| 568 } | |
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569 return ndl; |
| 38 | 570 } |
| 571 | |
| 572 | |
| 573 // =============================================================================== | |
| 574 // dive1_check_deco | |
| 575 /// @brief for NDL calculations | |
| 576 /// 160614 using ceilingOther and not ceiling | |
| 577 // =============================================================================== | |
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578 static _Bool dive1_check_deco(SDiveSettings *pDiveSettings) |
| 38 | 579 { |
| 580 // gGF_value is set in call routine; | |
| 581 // internes Backup! | |
| 582 | |
| 583 // calc like in deco | |
| 584 float ceiling; | |
| 585 float ceilingOther; // new hw 160614 | |
| 586 | |
| 587 ceiling = tissue_tolerance(); | |
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588 ambient_bar_to_deco_stop_depth_bar(pDiveSettings, ceiling); // this will set gStop.depth :-) (and gStop.id) |
| 38 | 589 |
| 590 // set the base for all upcoming parameters | |
| 591 ceilingOther = gStop.depth + gSurface_pressure_bar; | |
| 592 | |
| 593 // modify parameters if there is ascend or parameter fine adjustment | |
| 594 if(ceilingOther < (gPressure - PRESSURE_150_CM)) // more than 1.5 meter below ceiling | |
| 595 { | |
| 596 // ascend within 10 mtr to GF_low // speed 12 mtr/min -> 50 sec / 10 mtr; 15 sec / 3 mtr. | |
| 597 while(((gPressure - PRESSURE_TEN_METER ) > gSurface_pressure_bar) && (ceiling < (gPressure - PRESSURE_TEN_METER))) | |
| 598 { | |
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599 ascend_with_all_gaschanges(pDiveSettings, PRESSURE_TEN_METER); |
| 38 | 600 ceiling = tissue_tolerance(); |
| 601 } | |
| 602 while(((gPressure - PRESSURE_THREE_METER )> gSurface_pressure_bar) && (ceiling < gPressure)) | |
| 603 { | |
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604 ascend_with_all_gaschanges(pDiveSettings, PRESSURE_THREE_METER); |
| 38 | 605 ceiling = tissue_tolerance(); |
| 606 } | |
| 607 } | |
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608 return ceiling > gSurface_pressure_bar; |
| 38 | 609 } |
| 610 | |
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611 // compute ceiling recursively, with a resolution of 10cm. Notice |
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612 // that the initial call shall guarantee that the found ceiling |
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613 // is between low and high parameters. |
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614 static float compute_ceiling(float low, float high) |
| 38 | 615 { |
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616 if ((high - low) < 0.01) |
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617 return low; |
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618 else { |
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619 float next_pressure_absolute = (low + high)/2; |
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620 float test_result = buehlmann_tissue_test_tolerance(next_pressure_absolute); |
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621 if (test_result < 0) |
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622 return compute_ceiling(low, next_pressure_absolute); |
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623 else |
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624 return compute_ceiling(next_pressure_absolute, high); |
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625 } |
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626 } |
| 38 | 627 |
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628 void buehlmann_ceiling_calculator(SLifeData *pLifeData, SDecoinfo *pDecoInfo) |
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629 { |
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630 float ceiling; |
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631 |
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632 memcpy(gTissue_nitrogen_bar, pLifeData->tissue_nitrogen_bar, (4*16)); |
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633 memcpy(gTissue_helium_bar, pLifeData->tissue_helium_bar, (4*16)); |
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634 |
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635 // this is just performance optimizing. The code below runs just fine |
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636 // without this. There is never a ceiling in NDL deco state |
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637 if (!pDecoInfo->output_time_to_surface_seconds) { |
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638 pDecoInfo->output_ceiling_meter = 0; |
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639 return; |
| 38 | 640 } |
| 641 | |
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642 ceiling = compute_ceiling(pLifeData->pressure_surface_bar, 1.0f + pLifeData->max_depth_meter/10.0f); |
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643 pDecoInfo->output_ceiling_meter = (ceiling - pLifeData->pressure_surface_bar) * 10.0f; |
| 38 | 644 } |