Mercurial > public > ostc4
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 |
| 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) |
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262 || (pDiveSettings->gas[pDiveSettings->decogaslist[i].GasIdInSettings].note.ub.decocalc == 0)) |
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263 { |
| 38 | 264 break; |
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265 } |
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266 float pressureChange = ((float)pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero) / 10; |
| 38 | 267 if(gStop.depth <= pressureChange + 0.00001f) |
| 268 { | |
| 269 gGas_id = i; | |
| 270 } | |
| 271 else | |
| 272 { | |
| 273 break; | |
| 274 } | |
| 275 } | |
| 276 gStop.id--; | |
| 277 } | |
| 278 | |
|
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279 pDecoInfo->output_time_to_surface_seconds = tts_seconds; |
| 38 | 280 } |
| 281 | |
| 282 | |
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283 static float tissue_tolerance(void) |
| 38 | 284 { |
| 285 float tissue_inertgas_saturation; | |
| 286 float inertgas_a; | |
| 287 float inertgas_b; | |
| 288 float ceiling; | |
| 289 float global_ceiling; | |
| 290 int ci; | |
| 291 | |
| 292 global_ceiling = -1; | |
| 293 | |
| 294 for (ci = 0; ci < 16; ci++) | |
| 295 { | |
| 296 if(gTissue_helium_bar[ci] == 0) | |
| 297 { | |
| 298 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci]; | |
| 299 // | |
| 300 inertgas_a = buehlmann_N2_a[ci]; | |
| 301 inertgas_b = buehlmann_N2_b[ci]; | |
| 302 } | |
| 303 else | |
| 304 { | |
| 305 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci] + gTissue_helium_bar[ci]; | |
| 306 // | |
| 307 inertgas_a = ( ( buehlmann_N2_a[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_a[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 308 inertgas_b = ( ( buehlmann_N2_b[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_b[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 309 } | |
| 310 // | |
| 311 ceiling = (inertgas_b * ( tissue_inertgas_saturation - gGF_value * inertgas_a ) ) / (gGF_value - (inertgas_b * gGF_value) + inertgas_b); | |
| 312 if(ceiling > global_ceiling) | |
| 313 global_ceiling = ceiling; | |
| 314 } | |
| 315 return global_ceiling; | |
| 316 } | |
| 317 | |
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318 void buehlmann_super_saturation_calculator(SLifeData* pLifeData, SDecoinfo * pDecoInfo) |
| 38 | 319 { |
| 320 float tissue_inertgas_saturation; | |
| 321 float inertgas_a; | |
| 322 float inertgas_b; | |
| 323 float ceiling; | |
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324 float super_saturation; |
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325 float pres_respiration = pLifeData->pressure_ambient_bar; |
| 38 | 326 int ci; |
| 327 | |
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328 pDecoInfo->super_saturation = 0; |
| 38 | 329 |
| 330 for (ci = 0; ci < 16; ci++) | |
| 331 { | |
| 332 if(gTissue_helium_bar[ci] == 0) | |
| 333 { | |
| 334 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci]; | |
| 335 inertgas_a = buehlmann_N2_a[ci]; | |
| 336 inertgas_b = buehlmann_N2_b[ci]; | |
| 337 } | |
| 338 else | |
| 339 { | |
| 340 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci] + gTissue_helium_bar[ci]; | |
| 341 inertgas_a = ( ( buehlmann_N2_a[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_a[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 342 inertgas_b = ( ( buehlmann_N2_b[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_b[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 343 } | |
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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 | 347 { |
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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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351 if (super_saturation > pDecoInfo->super_saturation) |
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352 pDecoInfo->super_saturation = super_saturation; |
| 38 | 353 } |
| 354 } | |
| 355 } | |
| 356 | |
| 357 | |
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358 static float buehlmann_tissue_test_tolerance(float depth_in_bar_absolute) |
| 38 | 359 { |
| 360 float tissue_inertgas_saturation; | |
| 361 float inertgas_a; | |
| 362 float inertgas_b; | |
| 363 float inertgas_tolerance; | |
| 364 float gf_minus_1; | |
| 365 | |
| 366 gf_minus_1 = gGF_value - 1.0f; | |
| 367 | |
| 368 for (int ci = 0; ci < 16; ci++) | |
| 369 { | |
| 370 if(gTissue_helium_bar[ci] == 0) | |
| 371 { | |
| 372 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci]; | |
| 373 inertgas_a = buehlmann_N2_a[ci]; | |
| 374 inertgas_b = buehlmann_N2_b[ci]; | |
| 375 } | |
| 376 else | |
| 377 { | |
| 378 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci] + gTissue_helium_bar[ci]; | |
| 379 inertgas_a = ( ( buehlmann_N2_a[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_a[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 380 inertgas_b = ( ( buehlmann_N2_b[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_b[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 381 } | |
| 382 inertgas_tolerance = ( (gGF_value / inertgas_b - gf_minus_1) * depth_in_bar_absolute ) + ( gGF_value * inertgas_a ); | |
| 383 if(inertgas_tolerance < tissue_inertgas_saturation) | |
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384 return tissue_inertgas_saturation - inertgas_tolerance; // positive |
| 38 | 385 } |
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386 return tissue_inertgas_saturation - inertgas_tolerance; // negative |
| 38 | 387 } |
| 388 | |
| 389 | |
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390 static void ambient_bar_to_deco_stop_depth_bar(SDiveSettings *pDiveSettings, float ceiling) |
| 38 | 391 { |
| 392 int i; | |
| 393 | |
| 394 ceiling -= gSurface_pressure_bar; | |
| 395 | |
| 396 if(ceiling <= 0) | |
| 397 { | |
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398 gStop.depth = pDiveSettings->last_stop_depth_bar; |
| 38 | 399 gStop.id = 0; |
| 400 return; | |
| 401 } | |
| 402 | |
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403 if((ceiling - pDiveSettings->last_stop_depth_bar) <= 0) |
| 38 | 404 { |
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405 gStop.depth = pDiveSettings->last_stop_depth_bar; |
| 38 | 406 gStop.id = 0; |
| 407 return; | |
| 408 } | |
| 409 | |
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410 gStop.depth = pDiveSettings->input_second_to_last_stop_depth_bar; |
| 38 | 411 gStop.id = 1; |
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412 ceiling -= pDiveSettings->input_second_to_last_stop_depth_bar; |
| 38 | 413 |
| 414 if(ceiling <= 0) | |
| 415 return; | |
| 416 | |
| 417 for(i = 1; i < (DECOINFO_STRUCT_MAX_STOPS - 2); i++) | |
| 418 { | |
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419 ceiling -= pDiveSettings->input_next_stop_increment_depth_bar; |
| 38 | 420 if(ceiling <= 0) |
| 421 break; | |
| 422 } | |
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423 gStop.depth += i * pDiveSettings->input_next_stop_increment_depth_bar; |
| 38 | 424 gStop.id += i; |
| 425 return; | |
| 426 } | |
| 427 | |
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428 static float next_stop_depth_input_is_actual_stop_id(SDiveSettings *pDiveSettings, int actual_id) |
| 38 | 429 { |
| 430 if(actual_id == 0) | |
| 431 return 0; | |
| 432 | |
| 433 if(actual_id == 1) | |
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434 return pDiveSettings->last_stop_depth_bar; |
| 38 | 435 |
| 436 actual_id -= 2; | |
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437 return pDiveSettings->input_second_to_last_stop_depth_bar + (actual_id * pDiveSettings->input_next_stop_increment_depth_bar); |
| 38 | 438 } |
| 439 | |
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440 static int ascend_with_all_gaschanges(SDiveSettings *pDiveSettings, float pressure_decrease) |
| 38 | 441 { |
| 442 float pressureTop, pressureTop_tmp, pressureBottom, pressureChange, ascendrate_in_seconds_for_one_bar, pressure_difference; | |
|
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443 int time_for_ascend = 0; |
| 38 | 444 int seconds; |
| 445 int i; | |
| 446 | |
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447 ascendrate_in_seconds_for_one_bar = 60 * 10 / pDiveSettings->ascentRate_meterperminute; |
| 38 | 448 |
| 449 if(fabsf(gPressure - gSurface_pressure_bar) < PRESSURE_HALF_METER) | |
| 450 { | |
| 451 gPressure = gSurface_pressure_bar; | |
| 452 return 0; | |
| 453 } | |
| 454 | |
| 455 pressureTop = gPressure - pressure_decrease; | |
| 456 if( gSurface_pressure_bar > pressureTop) | |
| 457 pressureTop = gSurface_pressure_bar; | |
| 458 pressureBottom = gPressure; | |
| 459 seconds = 0; | |
| 460 do{ | |
| 461 pressureTop_tmp = pressureTop; | |
| 462 for(i = gGas_id + 1; i < BUEHLMANN_STRUCT_MAX_GASES; i++) | |
| 463 { | |
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464 if((pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero == 0) |
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465 || (pDiveSettings->gas[pDiveSettings->decogaslist[i].GasIdInSettings].note.ub.decocalc == 0)) |
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466 { |
| 38 | 467 break; |
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468 } |
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469 pressureChange = gSurface_pressure_bar + ((float)pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero) / 10; |
| 38 | 470 if(pressureBottom <= pressureChange) |
| 471 { | |
| 472 gGas_id = i; | |
| 473 } | |
| 474 else | |
| 475 { | |
| 476 break; | |
| 477 } | |
| 478 | |
| 479 } | |
| 480 for(i = gGas_id + 1; i < BUEHLMANN_STRUCT_MAX_GASES; i++) | |
| 481 { | |
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482 if((pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero == 0) |
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483 || (pDiveSettings->gas[pDiveSettings->decogaslist[i].GasIdInSettings].note.ub.decocalc == 0)) |
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484 { |
| 38 | 485 break; |
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486 } |
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487 |
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488 pressureChange = gSurface_pressure_bar + ((float)pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero)/ 10; |
| 38 | 489 if((pressureChange < pressureBottom) && (pressureChange > pressureTop)) |
| 490 { | |
| 491 pressureTop_tmp = pressureChange; | |
| 492 } | |
| 493 } | |
| 494 pressure_difference = pressureBottom - pressureTop_tmp; | |
| 495 if(pressure_difference > 0.0001f) | |
| 496 { | |
| 497 time_for_ascend = (int)ceilf(pressure_difference * ascendrate_in_seconds_for_one_bar); | |
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498 decom_tissues_exposure_stage_schreiner(time_for_ascend, &pDiveSettings->decogaslist[gGas_id], |
| 38 | 499 pressureBottom, pressureTop_tmp, gTissue_nitrogen_bar, gTissue_helium_bar); |
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500 decom_oxygen_calculate_cns_stage_SchreinerStyle(time_for_ascend,&pDiveSettings->decogaslist[gGas_id], |
| 38 | 501 pressureBottom, pressureTop_tmp, &gCNS); |
| 502 } | |
| 503 pressureBottom = pressureTop_tmp; | |
| 504 seconds += time_for_ascend; | |
| 505 }while(pressureTop_tmp > pressureTop); | |
| 506 gPressure = pressureTop; | |
| 507 return seconds; | |
| 508 } | |
| 509 | |
| 510 | |
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511 static float get_gf_at_pressure(SDiveSettings *pDiveSettings, float pressure) |
| 38 | 512 { |
| 513 float gfSteigung = 0.0f; | |
| 514 | |
| 515 if(gGF_low_depth_bar < 0) | |
| 516 gGF_low_depth_bar = PRESSURE_THREE_METER; // just to prevent erratic behaviour if variable is not set | |
| 517 | |
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518 gfSteigung = ((float)(pDiveSettings->gf_high - pDiveSettings->gf_low))/ gGF_low_depth_bar; |
| 38 | 519 |
| 520 | |
| 521 if((pressure - gSurface_pressure_bar) <= PRESSURE_HALF_METER) | |
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522 return ((float)pDiveSettings->gf_high) / 100.0f; |
| 38 | 523 |
| 524 if(pressure >= gSurface_pressure_bar + gGF_low_depth_bar) | |
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525 return ((float)pDiveSettings->gf_low) / 100.0f; |
| 38 | 526 |
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527 return (pDiveSettings->gf_high - gfSteigung * (pressure - gSurface_pressure_bar) )/ 100.0f; |
| 38 | 528 } |
| 529 | |
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530 #define MAX_NDL 240 |
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531 static int buehlmann_calc_ndl(SDiveSettings *pDiveSettings) |
| 38 | 532 { |
| 533 float local_tissue_nitrogen_bar[16]; | |
| 534 float local_tissue_helium_bar[16]; | |
| 535 int i; | |
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536 int ndl = 0; |
| 38 | 537 |
| 538 //Check ndl always use gHigh | |
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539 gGF_value = ((float)pDiveSettings->gf_high) / 100.0f; |
| 38 | 540 //10 minutes steps |
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541 while(ndl < (MAX_NDL * 60)) |
| 38 | 542 { |
| 543 memcpy(local_tissue_nitrogen_bar, gTissue_nitrogen_bar, (4*16)); | |
| 544 memcpy(local_tissue_helium_bar, gTissue_helium_bar, (4*16)); | |
| 545 // | |
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546 ndl += 600; |
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547 decom_tissues_exposure2(600, &pDiveSettings->decogaslist[gGas_id], gPressure,gTissue_nitrogen_bar,gTissue_helium_bar); |
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548 decom_oxygen_calculate_cns_exposure(600,&pDiveSettings->decogaslist[gGas_id],gPressure,&gCNS); |
| 38 | 549 buehlmann_backup_and_restore(true); |
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550 if(dive1_check_deco(pDiveSettings)) |
| 38 | 551 { |
| 552 buehlmann_backup_and_restore(false); | |
| 553 break; | |
| 554 } | |
| 555 buehlmann_backup_and_restore(false); | |
| 556 } | |
| 557 | |
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558 if(ndl < (MAX_NDL * 60)) |
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559 ndl -= 600; |
| 38 | 560 |
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561 if(ndl > (MAX_NDL/2 * 60)) |
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562 return ndl; |
| 38 | 563 |
| 564 // refine | |
| 565 memcpy(gTissue_nitrogen_bar, local_tissue_nitrogen_bar, (4*16)); | |
| 566 memcpy(gTissue_helium_bar, local_tissue_helium_bar, (4*16)); | |
| 567 | |
| 568 //One minutes step | |
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569 for(i = 0; i < 10; i++) |
| 38 | 570 { |
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571 ndl += 60; |
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572 decom_tissues_exposure2(60, &pDiveSettings->decogaslist[gGas_id], gPressure,gTissue_nitrogen_bar,gTissue_helium_bar); |
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573 decom_oxygen_calculate_cns_exposure(60,&pDiveSettings->decogaslist[gGas_id],gPressure,&gCNS); |
| 38 | 574 buehlmann_backup_and_restore(true); |
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575 if(dive1_check_deco(pDiveSettings)) |
| 38 | 576 break; |
| 577 buehlmann_backup_and_restore(false); | |
| 578 } | |
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579 return ndl; |
| 38 | 580 } |
| 581 | |
| 582 | |
| 583 // =============================================================================== | |
| 584 // dive1_check_deco | |
| 585 /// @brief for NDL calculations | |
| 586 /// 160614 using ceilingOther and not ceiling | |
| 587 // =============================================================================== | |
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588 static _Bool dive1_check_deco(SDiveSettings *pDiveSettings) |
| 38 | 589 { |
| 590 // gGF_value is set in call routine; | |
| 591 // internes Backup! | |
| 592 | |
| 593 // calc like in deco | |
| 594 float ceiling; | |
| 595 float ceilingOther; // new hw 160614 | |
| 596 | |
| 597 ceiling = tissue_tolerance(); | |
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598 ambient_bar_to_deco_stop_depth_bar(pDiveSettings, ceiling); // this will set gStop.depth :-) (and gStop.id) |
| 38 | 599 |
| 600 // set the base for all upcoming parameters | |
| 601 ceilingOther = gStop.depth + gSurface_pressure_bar; | |
| 602 | |
| 603 // modify parameters if there is ascend or parameter fine adjustment | |
| 604 if(ceilingOther < (gPressure - PRESSURE_150_CM)) // more than 1.5 meter below ceiling | |
| 605 { | |
| 606 // ascend within 10 mtr to GF_low // speed 12 mtr/min -> 50 sec / 10 mtr; 15 sec / 3 mtr. | |
| 607 while(((gPressure - PRESSURE_TEN_METER ) > gSurface_pressure_bar) && (ceiling < (gPressure - PRESSURE_TEN_METER))) | |
| 608 { | |
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609 ascend_with_all_gaschanges(pDiveSettings, PRESSURE_TEN_METER); |
| 38 | 610 ceiling = tissue_tolerance(); |
| 611 } | |
| 612 while(((gPressure - PRESSURE_THREE_METER )> gSurface_pressure_bar) && (ceiling < gPressure)) | |
| 613 { | |
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614 ascend_with_all_gaschanges(pDiveSettings, PRESSURE_THREE_METER); |
| 38 | 615 ceiling = tissue_tolerance(); |
| 616 } | |
| 617 } | |
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618 return ceiling > gSurface_pressure_bar; |
| 38 | 619 } |
| 620 | |
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621 // compute ceiling recursively, with a resolution of 10cm. Notice |
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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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624 static float compute_ceiling(float low, float high) |
| 38 | 625 { |
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626 if ((high - low) < 0.01) |
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627 return low; |
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628 else { |
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629 float next_pressure_absolute = (low + high)/2; |
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630 float test_result = buehlmann_tissue_test_tolerance(next_pressure_absolute); |
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631 if (test_result < 0) |
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632 return compute_ceiling(low, next_pressure_absolute); |
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633 else |
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634 return compute_ceiling(next_pressure_absolute, high); |
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635 } |
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636 } |
| 38 | 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; |
| 38 | 650 } |
| 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; |
| 38 | 654 } |