Mercurial > public > ostc4
annotate Discovery/Src/buehlmann.c @ 976:0b81ac558e89 Evo_2_23
Devbugfix UART buffer cleaning:
In the previous version a buffer cleaning function was used which resets the ringbuffer read index. As result the processing of data was stopped until the DMA write comes to the index 0. When reaching it the complete buffer was proceeded including possibly invalid data.
The usage of the cleanbuffer function was replaced by the flush buffer function (meaning the data is discarded but the data index is maintained). There was already a function for this. Because the function was 99% the same as the read function, it was integrated into the ReadData function. Calling the function with parameter flush = 1 will result in a buffer flush.
The workaround of the previous revision was updated to only be applied in case a DiveO2 sensor is operated in stand alone mode.
| author | Ideenmodellierer |
|---|---|
| date | Wed, 29 Jan 2025 17:21:20 +0100 (3 months ago) |
| parents | 79b522fbabe6 |
| children | 7891160acde3 |
| 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) |
| 973 | 262 #ifdef ENABLE_DECOCALC_OPTION |
| 263 || (pDiveSettings->gas[pDiveSettings->decogaslist[i].GasIdInSettings].note.ub.decocalc == 0) | |
| 264 #endif | |
| 265 ) | |
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266 { |
| 38 | 267 break; |
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268 } |
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269 float pressureChange = ((float)pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero) / 10; |
| 38 | 270 if(gStop.depth <= pressureChange + 0.00001f) |
| 271 { | |
| 272 gGas_id = i; | |
| 273 } | |
| 274 else | |
| 275 { | |
| 276 break; | |
| 277 } | |
| 278 } | |
| 279 gStop.id--; | |
| 280 } | |
| 281 | |
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282 pDecoInfo->output_time_to_surface_seconds = tts_seconds; |
| 38 | 283 } |
| 284 | |
| 285 | |
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286 static float tissue_tolerance(void) |
| 38 | 287 { |
| 288 float tissue_inertgas_saturation; | |
| 289 float inertgas_a; | |
| 290 float inertgas_b; | |
| 291 float ceiling; | |
| 292 float global_ceiling; | |
| 293 int ci; | |
| 294 | |
| 295 global_ceiling = -1; | |
| 296 | |
| 297 for (ci = 0; ci < 16; ci++) | |
| 298 { | |
| 299 if(gTissue_helium_bar[ci] == 0) | |
| 300 { | |
| 301 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci]; | |
| 302 // | |
| 303 inertgas_a = buehlmann_N2_a[ci]; | |
| 304 inertgas_b = buehlmann_N2_b[ci]; | |
| 305 } | |
| 306 else | |
| 307 { | |
| 308 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci] + gTissue_helium_bar[ci]; | |
| 309 // | |
| 310 inertgas_a = ( ( buehlmann_N2_a[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_a[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 311 inertgas_b = ( ( buehlmann_N2_b[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_b[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 312 } | |
| 313 // | |
| 314 ceiling = (inertgas_b * ( tissue_inertgas_saturation - gGF_value * inertgas_a ) ) / (gGF_value - (inertgas_b * gGF_value) + inertgas_b); | |
| 315 if(ceiling > global_ceiling) | |
| 316 global_ceiling = ceiling; | |
| 317 } | |
| 318 return global_ceiling; | |
| 319 } | |
| 320 | |
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321 void buehlmann_super_saturation_calculator(SLifeData* pLifeData, SDecoinfo * pDecoInfo) |
| 38 | 322 { |
| 323 float tissue_inertgas_saturation; | |
| 324 float inertgas_a; | |
| 325 float inertgas_b; | |
| 326 float ceiling; | |
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327 float super_saturation; |
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328 float pres_respiration = pLifeData->pressure_ambient_bar; |
| 38 | 329 int ci; |
| 330 | |
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331 pDecoInfo->super_saturation = 0; |
| 38 | 332 |
| 333 for (ci = 0; ci < 16; ci++) | |
| 334 { | |
| 335 if(gTissue_helium_bar[ci] == 0) | |
| 336 { | |
| 337 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci]; | |
| 338 inertgas_a = buehlmann_N2_a[ci]; | |
| 339 inertgas_b = buehlmann_N2_b[ci]; | |
| 340 } | |
| 341 else | |
| 342 { | |
| 343 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci] + gTissue_helium_bar[ci]; | |
| 344 inertgas_a = ( ( buehlmann_N2_a[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_a[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 345 inertgas_b = ( ( buehlmann_N2_b[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_b[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 346 } | |
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347 |
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348 ceiling = pres_respiration / inertgas_b + inertgas_a; |
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349 if(tissue_inertgas_saturation > pres_respiration) |
| 38 | 350 { |
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351 super_saturation = |
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352 (tissue_inertgas_saturation - pres_respiration) / (ceiling - pres_respiration); |
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353 |
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354 if (super_saturation > pDecoInfo->super_saturation) |
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355 pDecoInfo->super_saturation = super_saturation; |
| 38 | 356 } |
| 357 } | |
| 358 } | |
| 359 | |
| 360 | |
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361 static float buehlmann_tissue_test_tolerance(float depth_in_bar_absolute) |
| 38 | 362 { |
| 363 float tissue_inertgas_saturation; | |
| 364 float inertgas_a; | |
| 365 float inertgas_b; | |
| 366 float inertgas_tolerance; | |
| 367 float gf_minus_1; | |
| 368 | |
| 369 gf_minus_1 = gGF_value - 1.0f; | |
| 370 | |
| 371 for (int ci = 0; ci < 16; ci++) | |
| 372 { | |
| 373 if(gTissue_helium_bar[ci] == 0) | |
| 374 { | |
| 375 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci]; | |
| 376 inertgas_a = buehlmann_N2_a[ci]; | |
| 377 inertgas_b = buehlmann_N2_b[ci]; | |
| 378 } | |
| 379 else | |
| 380 { | |
| 381 tissue_inertgas_saturation = gTissue_nitrogen_bar[ci] + gTissue_helium_bar[ci]; | |
| 382 inertgas_a = ( ( buehlmann_N2_a[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_a[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 383 inertgas_b = ( ( buehlmann_N2_b[ci] * gTissue_nitrogen_bar[ci]) + ( buehlmann_He_b[ci] * gTissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
| 384 } | |
| 385 inertgas_tolerance = ( (gGF_value / inertgas_b - gf_minus_1) * depth_in_bar_absolute ) + ( gGF_value * inertgas_a ); | |
| 386 if(inertgas_tolerance < tissue_inertgas_saturation) | |
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387 return tissue_inertgas_saturation - inertgas_tolerance; // positive |
| 38 | 388 } |
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389 return tissue_inertgas_saturation - inertgas_tolerance; // negative |
| 38 | 390 } |
| 391 | |
| 392 | |
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393 static void ambient_bar_to_deco_stop_depth_bar(SDiveSettings *pDiveSettings, float ceiling) |
| 38 | 394 { |
| 395 int i; | |
| 396 | |
| 397 ceiling -= gSurface_pressure_bar; | |
| 398 | |
| 399 if(ceiling <= 0) | |
| 400 { | |
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401 gStop.depth = pDiveSettings->last_stop_depth_bar; |
| 38 | 402 gStop.id = 0; |
| 403 return; | |
| 404 } | |
| 405 | |
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406 if((ceiling - pDiveSettings->last_stop_depth_bar) <= 0) |
| 38 | 407 { |
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408 gStop.depth = pDiveSettings->last_stop_depth_bar; |
| 38 | 409 gStop.id = 0; |
| 410 return; | |
| 411 } | |
| 412 | |
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413 gStop.depth = pDiveSettings->input_second_to_last_stop_depth_bar; |
| 38 | 414 gStop.id = 1; |
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415 ceiling -= pDiveSettings->input_second_to_last_stop_depth_bar; |
| 38 | 416 |
| 417 if(ceiling <= 0) | |
| 418 return; | |
| 419 | |
| 420 for(i = 1; i < (DECOINFO_STRUCT_MAX_STOPS - 2); i++) | |
| 421 { | |
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422 ceiling -= pDiveSettings->input_next_stop_increment_depth_bar; |
| 38 | 423 if(ceiling <= 0) |
| 424 break; | |
| 425 } | |
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426 gStop.depth += i * pDiveSettings->input_next_stop_increment_depth_bar; |
| 38 | 427 gStop.id += i; |
| 428 return; | |
| 429 } | |
| 430 | |
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431 static float next_stop_depth_input_is_actual_stop_id(SDiveSettings *pDiveSettings, int actual_id) |
| 38 | 432 { |
| 433 if(actual_id == 0) | |
| 434 return 0; | |
| 435 | |
| 436 if(actual_id == 1) | |
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437 return pDiveSettings->last_stop_depth_bar; |
| 38 | 438 |
| 439 actual_id -= 2; | |
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440 return pDiveSettings->input_second_to_last_stop_depth_bar + (actual_id * pDiveSettings->input_next_stop_increment_depth_bar); |
| 38 | 441 } |
| 442 | |
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443 static int ascend_with_all_gaschanges(SDiveSettings *pDiveSettings, float pressure_decrease) |
| 38 | 444 { |
| 445 float pressureTop, pressureTop_tmp, pressureBottom, pressureChange, ascendrate_in_seconds_for_one_bar, pressure_difference; | |
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446 int time_for_ascend = 0; |
| 38 | 447 int seconds; |
| 448 int i; | |
| 449 | |
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450 ascendrate_in_seconds_for_one_bar = 60 * 10 / pDiveSettings->ascentRate_meterperminute; |
| 38 | 451 |
| 452 if(fabsf(gPressure - gSurface_pressure_bar) < PRESSURE_HALF_METER) | |
| 453 { | |
| 454 gPressure = gSurface_pressure_bar; | |
| 455 return 0; | |
| 456 } | |
| 457 | |
| 458 pressureTop = gPressure - pressure_decrease; | |
| 459 if( gSurface_pressure_bar > pressureTop) | |
| 460 pressureTop = gSurface_pressure_bar; | |
| 461 pressureBottom = gPressure; | |
| 462 seconds = 0; | |
| 463 do{ | |
| 464 pressureTop_tmp = pressureTop; | |
| 465 for(i = gGas_id + 1; i < BUEHLMANN_STRUCT_MAX_GASES; i++) | |
| 466 { | |
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467 if((pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero == 0) |
| 973 | 468 #ifdef ENABLE_DECOCALC_OPTION |
| 469 || (pDiveSettings->gas[pDiveSettings->decogaslist[i].GasIdInSettings].note.ub.decocalc == 0) | |
| 470 #endif | |
| 471 ) | |
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472 { |
| 38 | 473 break; |
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474 } |
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475 pressureChange = gSurface_pressure_bar + ((float)pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero) / 10; |
| 38 | 476 if(pressureBottom <= pressureChange) |
| 477 { | |
| 478 gGas_id = i; | |
| 479 } | |
| 480 else | |
| 481 { | |
| 482 break; | |
| 483 } | |
| 484 | |
| 485 } | |
| 486 for(i = gGas_id + 1; i < BUEHLMANN_STRUCT_MAX_GASES; i++) | |
| 487 { | |
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488 if((pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero == 0) |
| 973 | 489 #ifdef ENABLE_DECOCALC_OPTION |
| 490 || (pDiveSettings->gas[pDiveSettings->decogaslist[i].GasIdInSettings].note.ub.decocalc == 0) | |
| 491 #endif | |
| 492 ) | |
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493 { |
| 38 | 494 break; |
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495 } |
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496 |
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497 pressureChange = gSurface_pressure_bar + ((float)pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero)/ 10; |
| 38 | 498 if((pressureChange < pressureBottom) && (pressureChange > pressureTop)) |
| 499 { | |
| 500 pressureTop_tmp = pressureChange; | |
| 501 } | |
| 502 } | |
| 503 pressure_difference = pressureBottom - pressureTop_tmp; | |
| 504 if(pressure_difference > 0.0001f) | |
| 505 { | |
| 506 time_for_ascend = (int)ceilf(pressure_difference * ascendrate_in_seconds_for_one_bar); | |
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507 decom_tissues_exposure_stage_schreiner(time_for_ascend, &pDiveSettings->decogaslist[gGas_id], |
| 38 | 508 pressureBottom, pressureTop_tmp, gTissue_nitrogen_bar, gTissue_helium_bar); |
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509 decom_oxygen_calculate_cns_stage_SchreinerStyle(time_for_ascend,&pDiveSettings->decogaslist[gGas_id], |
| 38 | 510 pressureBottom, pressureTop_tmp, &gCNS); |
| 511 } | |
| 512 pressureBottom = pressureTop_tmp; | |
| 513 seconds += time_for_ascend; | |
| 514 }while(pressureTop_tmp > pressureTop); | |
| 515 gPressure = pressureTop; | |
| 516 return seconds; | |
| 517 } | |
| 518 | |
| 519 | |
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520 static float get_gf_at_pressure(SDiveSettings *pDiveSettings, float pressure) |
| 38 | 521 { |
| 522 float gfSteigung = 0.0f; | |
| 523 | |
| 524 if(gGF_low_depth_bar < 0) | |
| 525 gGF_low_depth_bar = PRESSURE_THREE_METER; // just to prevent erratic behaviour if variable is not set | |
| 526 | |
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527 gfSteigung = ((float)(pDiveSettings->gf_high - pDiveSettings->gf_low))/ gGF_low_depth_bar; |
| 38 | 528 |
| 529 | |
| 530 if((pressure - gSurface_pressure_bar) <= PRESSURE_HALF_METER) | |
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531 return ((float)pDiveSettings->gf_high) / 100.0f; |
| 38 | 532 |
| 533 if(pressure >= gSurface_pressure_bar + gGF_low_depth_bar) | |
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534 return ((float)pDiveSettings->gf_low) / 100.0f; |
| 38 | 535 |
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536 return (pDiveSettings->gf_high - gfSteigung * (pressure - gSurface_pressure_bar) )/ 100.0f; |
| 38 | 537 } |
| 538 | |
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539 #define MAX_NDL 240 |
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540 static int buehlmann_calc_ndl(SDiveSettings *pDiveSettings) |
| 38 | 541 { |
| 542 float local_tissue_nitrogen_bar[16]; | |
| 543 float local_tissue_helium_bar[16]; | |
| 544 int i; | |
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545 int ndl = 0; |
| 38 | 546 |
| 547 //Check ndl always use gHigh | |
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548 gGF_value = ((float)pDiveSettings->gf_high) / 100.0f; |
| 38 | 549 //10 minutes steps |
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550 while(ndl < (MAX_NDL * 60)) |
| 38 | 551 { |
| 552 memcpy(local_tissue_nitrogen_bar, gTissue_nitrogen_bar, (4*16)); | |
| 553 memcpy(local_tissue_helium_bar, gTissue_helium_bar, (4*16)); | |
| 554 // | |
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555 ndl += 600; |
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556 decom_tissues_exposure2(600, &pDiveSettings->decogaslist[gGas_id], gPressure,gTissue_nitrogen_bar,gTissue_helium_bar); |
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557 decom_oxygen_calculate_cns_exposure(600,&pDiveSettings->decogaslist[gGas_id],gPressure,&gCNS); |
| 38 | 558 buehlmann_backup_and_restore(true); |
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559 if(dive1_check_deco(pDiveSettings)) |
| 38 | 560 { |
| 561 buehlmann_backup_and_restore(false); | |
| 562 break; | |
| 563 } | |
| 564 buehlmann_backup_and_restore(false); | |
| 565 } | |
| 566 | |
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567 if(ndl < (MAX_NDL * 60)) |
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568 ndl -= 600; |
| 38 | 569 |
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570 if(ndl > (MAX_NDL/2 * 60)) |
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571 return ndl; |
| 38 | 572 |
| 573 // refine | |
| 574 memcpy(gTissue_nitrogen_bar, local_tissue_nitrogen_bar, (4*16)); | |
| 575 memcpy(gTissue_helium_bar, local_tissue_helium_bar, (4*16)); | |
| 576 | |
| 577 //One minutes step | |
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578 for(i = 0; i < 10; i++) |
| 38 | 579 { |
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580 ndl += 60; |
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581 decom_tissues_exposure2(60, &pDiveSettings->decogaslist[gGas_id], gPressure,gTissue_nitrogen_bar,gTissue_helium_bar); |
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582 decom_oxygen_calculate_cns_exposure(60,&pDiveSettings->decogaslist[gGas_id],gPressure,&gCNS); |
| 38 | 583 buehlmann_backup_and_restore(true); |
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584 if(dive1_check_deco(pDiveSettings)) |
| 38 | 585 break; |
| 586 buehlmann_backup_and_restore(false); | |
| 587 } | |
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588 return ndl; |
| 38 | 589 } |
| 590 | |
| 591 | |
| 592 // =============================================================================== | |
| 593 // dive1_check_deco | |
| 594 /// @brief for NDL calculations | |
| 595 /// 160614 using ceilingOther and not ceiling | |
| 596 // =============================================================================== | |
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597 static _Bool dive1_check_deco(SDiveSettings *pDiveSettings) |
| 38 | 598 { |
| 599 // gGF_value is set in call routine; | |
| 600 // internes Backup! | |
| 601 | |
| 602 // calc like in deco | |
| 603 float ceiling; | |
| 604 float ceilingOther; // new hw 160614 | |
| 605 | |
| 606 ceiling = tissue_tolerance(); | |
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607 ambient_bar_to_deco_stop_depth_bar(pDiveSettings, ceiling); // this will set gStop.depth :-) (and gStop.id) |
| 38 | 608 |
| 609 // set the base for all upcoming parameters | |
| 610 ceilingOther = gStop.depth + gSurface_pressure_bar; | |
| 611 | |
| 612 // modify parameters if there is ascend or parameter fine adjustment | |
| 613 if(ceilingOther < (gPressure - PRESSURE_150_CM)) // more than 1.5 meter below ceiling | |
| 614 { | |
| 615 // ascend within 10 mtr to GF_low // speed 12 mtr/min -> 50 sec / 10 mtr; 15 sec / 3 mtr. | |
| 616 while(((gPressure - PRESSURE_TEN_METER ) > gSurface_pressure_bar) && (ceiling < (gPressure - PRESSURE_TEN_METER))) | |
| 617 { | |
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618 ascend_with_all_gaschanges(pDiveSettings, PRESSURE_TEN_METER); |
| 38 | 619 ceiling = tissue_tolerance(); |
| 620 } | |
| 621 while(((gPressure - PRESSURE_THREE_METER )> gSurface_pressure_bar) && (ceiling < gPressure)) | |
| 622 { | |
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623 ascend_with_all_gaschanges(pDiveSettings, PRESSURE_THREE_METER); |
| 38 | 624 ceiling = tissue_tolerance(); |
| 625 } | |
| 626 } | |
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627 return ceiling > gSurface_pressure_bar; |
| 38 | 628 } |
| 629 | |
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630 // compute ceiling recursively, with a resolution of 10cm. Notice |
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631 // that the initial call shall guarantee that the found ceiling |
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632 // is between low and high parameters. |
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633 static float compute_ceiling(float low, float high) |
| 38 | 634 { |
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635 if ((high - low) < 0.01) |
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636 return low; |
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637 else { |
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638 float next_pressure_absolute = (low + high)/2; |
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639 float test_result = buehlmann_tissue_test_tolerance(next_pressure_absolute); |
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640 if (test_result < 0) |
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641 return compute_ceiling(low, next_pressure_absolute); |
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642 else |
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643 return compute_ceiling(next_pressure_absolute, high); |
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644 } |
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645 } |
| 38 | 646 |
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647 void buehlmann_ceiling_calculator(SLifeData *pLifeData, SDecoinfo *pDecoInfo) |
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648 { |
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649 float ceiling; |
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650 |
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651 memcpy(gTissue_nitrogen_bar, pLifeData->tissue_nitrogen_bar, (4*16)); |
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652 memcpy(gTissue_helium_bar, pLifeData->tissue_helium_bar, (4*16)); |
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653 |
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654 // this is just performance optimizing. The code below runs just fine |
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655 // without this. There is never a ceiling in NDL deco state |
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656 if (!pDecoInfo->output_time_to_surface_seconds) { |
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657 pDecoInfo->output_ceiling_meter = 0; |
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658 return; |
| 38 | 659 } |
| 660 | |
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661 ceiling = compute_ceiling(pLifeData->pressure_surface_bar, 1.0f + pLifeData->max_depth_meter/10.0f); |
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662 pDecoInfo->output_ceiling_meter = (ceiling - pLifeData->pressure_surface_bar) * 10.0f; |
| 38 | 663 } |