Mercurial > public > ostc4
annotate Small_CPU/Src/pressure.c @ 251:90cbeee0e1d4
Merged in janlmulder/ostc4/bm-2 (pull request #17)
Buelmann: new implementation for ceiling
| author | heinrichsweikamp <bitbucket@heinrichsweikamp.com> |
|---|---|
| date | Fri, 12 Apr 2019 07:22:14 +0000 |
| parents | 2b9775f71e30 |
| children | 8e9c502c0b06 |
| rev | line source |
|---|---|
| 38 | 1 /** |
| 2 ****************************************************************************** | |
| 3 * @file pressure.c | |
| 4 * @author heinrichs weikamp gmbh | |
| 5 * @date 2014 | |
| 6 * @version V0.0.2 | |
| 7 * @since 20-Oct-2016 | |
| 8 * @brief | |
| 9 * | |
| 10 @verbatim | |
| 11 ============================================================================== | |
| 12 ##### How to use ##### | |
| 13 ============================================================================== | |
| 14 V0.0.2 18-Oct-2016 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015 | |
| 15 | |
| 16 @endverbatim | |
| 17 ****************************************************************************** | |
| 18 * @attention | |
| 19 * | |
| 20 * <h2><center>© COPYRIGHT(c) 2016 heinrichs weikamp</center></h2> | |
| 21 * | |
| 22 ****************************************************************************** | |
| 23 */ | |
| 24 | |
| 25 | |
| 26 | |
| 27 /* surface time | |
| 28 the last 30 minutes will be saved once per minute in a endless loop | |
| 29 at the beginning of a dive the oldest value will be used | |
| 30 */ | |
| 31 | |
|
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32 #include "scheduler.h" |
| 38 | 33 #include "pressure.h" |
| 34 #include "i2c.h" | |
| 35 #include "rtc.h" | |
| 36 | |
| 37 #define CMD_RESET 0x1E // ADC reset command | |
| 38 #define CMD_ADC_READ 0x00 // ADC read command | |
| 39 #define CMD_ADC_CONV 0x40 // ADC conversion command | |
| 40 #define CMD_ADC_D1 0x00 // ADC D1 conversion | |
| 41 #define CMD_ADC_D2 0x10 // ADC D2 conversion | |
| 42 #define CMD_ADC_256 0x00 // ADC OSR=256 | |
| 43 #define CMD_ADC_512 0x02 // ADC OSR=512 | |
| 44 #define CMD_ADC_1024 0x04 // ADC OSR=1024 | |
| 45 #define CMD_ADC_2048 0x06 // ADC OSR=2056 | |
| 46 #define CMD_ADC_4096 0x08 // ADC OSR=4096 | |
| 47 #define CMD_PROM_RD 0xA0 // Prom read command | |
| 48 | |
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49 static uint16_t get_ci_by_coef_num(uint8_t coef_num); |
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50 //void pressure_calculation_new(void); |
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51 //void pressure_calculation_old(void); |
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52 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void); |
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53 static uint8_t crc4(uint16_t n_prom[]); |
| 38 | 54 |
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55 static HAL_StatusTypeDef pressure_sensor_get_data(void); |
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56 static uint32_t get_adc(void); |
| 38 | 57 uint8_t pressureSensorInitSuccess = 0; |
| 58 | |
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59 static uint16_t C[8] = { 1 }; |
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60 static uint32_t D1 = 1; |
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61 static uint32_t D2 = 1; |
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62 static uint8_t n_crc; |
| 38 | 63 |
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64 static int64_t C5_x_2p8 = 1; |
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65 static int64_t C2_x_2p16 = 1; |
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66 static int64_t C1_x_2p15 = 1; |
| 38 | 67 |
| 68 /* | |
| 69 short C2plus10000 = -1; | |
| 70 short C3plus200 = -1; | |
| 71 short C4minus250 = -1; | |
| 72 short UT1 = -1; | |
| 73 short C6plus100 = -1; | |
| 74 */ | |
| 75 | |
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76 static float ambient_temperature = 0; |
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77 static float ambient_pressure_mbar = 0; |
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78 static float surface_pressure_mbar = 1000; |
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79 static float surface_ring_mbar[31] = { 0 }; |
| 38 | 80 |
| 81 uint8_t secondCounterSurfaceRing = 0; | |
| 82 | |
| 83 float get_temperature(void) | |
| 84 { | |
| 85 return ambient_temperature; | |
| 86 } | |
| 87 | |
| 88 float get_pressure_mbar(void) | |
| 89 { | |
| 90 return ambient_pressure_mbar; | |
| 91 } | |
| 92 | |
| 93 float get_surface_mbar(void) | |
| 94 { | |
| 95 return surface_pressure_mbar; | |
| 96 } | |
| 97 | |
| 98 | |
| 99 void init_surface_ring(void) | |
| 100 { | |
| 101 surface_ring_mbar[0] = 0; | |
| 102 for(int i=1; i<31; i++) | |
| 103 surface_ring_mbar[i] = ambient_pressure_mbar; | |
| 104 surface_pressure_mbar = ambient_pressure_mbar; | |
| 105 } | |
| 106 | |
| 107 | |
| 108 /* the ring has one place with 0 | |
| 109 * after that comes the oldest value | |
| 110 * the new pressure is written in this hole | |
| 111 * the oldest value is read and then the new hole | |
| 112 */ | |
| 113 void update_surface_pressure(uint8_t call_rhythm_seconds) | |
| 114 { | |
| 115 secondCounterSurfaceRing += call_rhythm_seconds; | |
| 116 | |
| 117 if(secondCounterSurfaceRing < 60) | |
| 118 return; | |
| 119 | |
| 120 secondCounterSurfaceRing = 0; | |
| 121 | |
| 122 int hole; | |
| 123 for(hole=30;hole>0;hole--) | |
| 124 if(surface_ring_mbar[hole] == 0) { break; } | |
| 125 | |
| 126 surface_ring_mbar[hole] = ambient_pressure_mbar; | |
| 127 | |
| 128 hole++; | |
| 129 if(hole > 30) | |
| 130 hole = 0; | |
| 131 surface_pressure_mbar = surface_ring_mbar[hole]; | |
| 132 surface_ring_mbar[hole] = 0; | |
| 133 } | |
| 134 | |
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135 #ifdef DEMOMODE |
| 38 | 136 float demo_modify_temperature_helper(float bottom_mbar_diff_to_surface) |
| 137 { | |
| 138 const float temperature_surface = 31.0; | |
| 139 const float temperature_bottom = 14.0; | |
| 140 | |
| 141 const float temperature_difference = temperature_bottom - temperature_surface; | |
| 142 | |
| 143 // range 0.0 - 1.0 | |
| 144 float position_now = (ambient_pressure_mbar - surface_pressure_mbar) / bottom_mbar_diff_to_surface; | |
| 145 | |
| 146 if(position_now <= 0) | |
| 147 return temperature_surface; | |
| 148 | |
| 149 if(position_now >= 1) | |
| 150 return temperature_bottom; | |
| 151 | |
| 152 return temperature_surface + (temperature_difference * position_now); | |
| 153 } | |
| 154 | |
| 155 | |
| 156 uint32_t demo_modify_temperature_and_pressure(int32_t divetime_in_seconds, uint8_t subseconds, float ceiling_mbar) | |
| 157 { | |
| 158 | |
| 159 const float descent_rate = 4000/60; | |
| 160 const float ascent_rate = 1000/60; | |
| 161 const uint32_t seconds_descend = (1 * 60) + 30; | |
| 162 const uint32_t turbo_seconds_at_bottom_start = (0 * 60) + 0; | |
| 163 const uint32_t seconds_descend_and_bottomtime = seconds_descend + turbo_seconds_at_bottom_start + (2 * 60) + 0; | |
| 164 uint32_t time_elapsed_in_seconds; | |
| 165 static float ambient_pressure_mbar_memory = 0; | |
| 166 static uint32_t time_last_call = 0; | |
| 167 | |
| 168 if(divetime_in_seconds <= seconds_descend) | |
| 169 { | |
| 170 ambient_pressure_mbar = (divetime_in_seconds * descent_rate) + ((float)(subseconds) * descent_rate) + surface_pressure_mbar; | |
| 171 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 172 | |
| 173 time_last_call = divetime_in_seconds; | |
| 174 return 0; | |
| 175 } | |
| 176 else | |
| 177 if(divetime_in_seconds <= seconds_descend + turbo_seconds_at_bottom_start) | |
| 178 { | |
| 179 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar; | |
| 180 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 181 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 182 time_last_call = divetime_in_seconds; | |
| 183 return turbo_seconds_at_bottom_start; | |
| 184 } | |
| 185 else | |
| 186 if(divetime_in_seconds <= seconds_descend_and_bottomtime) | |
| 187 { | |
| 188 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar; | |
| 189 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 190 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 191 time_last_call = divetime_in_seconds; | |
| 192 return 0; | |
| 193 } | |
| 194 else | |
| 195 { | |
| 196 time_elapsed_in_seconds = divetime_in_seconds - time_last_call; | |
| 197 ambient_pressure_mbar = ambient_pressure_mbar_memory - time_elapsed_in_seconds * ascent_rate; | |
| 198 | |
| 199 if(ambient_pressure_mbar < surface_pressure_mbar) | |
| 200 ambient_pressure_mbar = surface_pressure_mbar; | |
| 201 else if(ambient_pressure_mbar < ceiling_mbar) | |
| 202 ambient_pressure_mbar = ceiling_mbar; | |
| 203 | |
| 204 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 205 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 206 time_last_call = divetime_in_seconds; | |
| 207 return 0; | |
| 208 } | |
| 209 } | |
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210 #endif |
| 38 | 211 |
| 212 | |
| 213 /* called just once on power on */ | |
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214 /* TBD old DR5 code? */ |
| 38 | 215 void init_pressure_DRx(void) |
| 216 { | |
| 217 uint8_t resetCommand[1] = {0x1E}; | |
| 218 | |
| 219 I2C_Master_Transmit( DEVICE_PRESSURE, resetCommand, 1); | |
| 220 HAL_Delay(3); | |
| 221 | |
| 222 C[1] = get_ci_by_coef_num(0x02); | |
| 223 C[2] = get_ci_by_coef_num(0x04); | |
| 224 C[3] = get_ci_by_coef_num(0x06); | |
| 225 C[4] = get_ci_by_coef_num(0x08); | |
| 226 C[5] = get_ci_by_coef_num(0x0A); | |
| 227 C[6] = get_ci_by_coef_num(0x0C); | |
| 228 | |
| 229 C5_x_2p8 = C[5] * 256; | |
| 230 C2_x_2p16 = C[2] * 65536; | |
| 231 C1_x_2p15 = C[1] * 32768; | |
| 232 pressure_update(); | |
| 233 } | |
| 234 | |
| 235 uint8_t is_init_pressure_done(void) | |
| 236 { | |
| 237 return pressureSensorInitSuccess; | |
| 238 } | |
| 239 | |
| 240 uint8_t init_pressure(void) | |
| 241 { | |
| 242 uint8_t buffer[1]; | |
| 243 buffer[0] = 0x1e; | |
| 244 uint8_t retValue = 0xFF; | |
| 245 | |
| 246 | |
| 247 retValue = I2C_Master_Transmit( DEVICE_PRESSURE, buffer, 1); | |
| 248 if(retValue != HAL_OK) | |
| 249 { | |
| 250 return (HAL_StatusTypeDef)retValue; | |
| 251 } | |
| 252 HAL_Delay(3); | |
| 253 | |
| 254 for(uint8_t i=0;i<8;i++) | |
| 255 { | |
| 256 C[i] = get_ci_by_coef_num(i); | |
| 257 } | |
| 258 n_crc = crc4(C); // no evaluation at the moment hw 151026 | |
| 259 | |
| 260 C5_x_2p8 = C[5] * 256; | |
| 261 C2_x_2p16 = C[2] * 65536; | |
| 262 C1_x_2p15 = C[1] * 32768; | |
| 263 | |
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264 if(global.I2C_SystemStatus == HAL_OK) |
| 38 | 265 { |
| 266 pressureSensorInitSuccess = 1; | |
| 267 } | |
| 268 return pressure_update(); | |
| 269 } | |
| 270 | |
| 271 | |
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272 static uint32_t get_adc(void) |
| 38 | 273 { |
| 274 uint8_t buffer[1]; | |
| 275 uint8_t resivebuf[4]; | |
| 276 uint32_t answer = 0; | |
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277 |
| 38 | 278 buffer[0] = 0x00; // Get ADC |
| 279 I2C_Master_Transmit( DEVICE_PRESSURE, buffer, 1); | |
| 280 I2C_Master_Receive( DEVICE_PRESSURE, resivebuf, 4); | |
| 281 resivebuf[3] = 0; | |
| 282 answer = 256*256 *(uint32_t)resivebuf[0] + 256 * (uint32_t)resivebuf[1] + (uint32_t)resivebuf[2]; | |
| 283 | |
| 284 return answer; | |
| 285 } | |
| 286 | |
| 287 | |
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288 static uint16_t get_ci_by_coef_num(uint8_t coef_num) |
| 38 | 289 { |
| 290 uint8_t resivebuf[2]; | |
| 291 | |
| 292 uint8_t cmd = CMD_PROM_RD+coef_num*2; | |
| 293 I2C_Master_Transmit( DEVICE_PRESSURE, &cmd, 1); | |
| 294 I2C_Master_Receive( DEVICE_PRESSURE, resivebuf, 2); | |
| 295 return (256*(uint16_t)resivebuf[0]) + (uint16_t)resivebuf[1]; | |
| 296 } | |
| 297 | |
| 298 | |
| 299 | |
| 300 uint8_t pressure_update(void) | |
| 301 { | |
| 302 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; | |
| 303 | |
| 304 statusReturn = pressure_sensor_get_data(); | |
| 305 pressure_calculation(); | |
| 306 return (uint8_t)statusReturn; | |
| 307 } | |
| 308 | |
| 309 | |
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310 static uint32_t pressure_sensor_get_one_value(uint8_t cmd, HAL_StatusTypeDef *statusReturn) |
| 38 | 311 { |
| 312 uint8_t command = CMD_ADC_CONV + cmd; | |
| 313 HAL_StatusTypeDef statusReturnTemp = HAL_TIMEOUT; | |
| 314 | |
| 315 statusReturnTemp = I2C_Master_Transmit( DEVICE_PRESSURE, &command, 1); | |
| 316 | |
| 317 if(statusReturn) | |
| 318 { | |
| 319 *statusReturn = statusReturnTemp; | |
| 320 } | |
| 321 | |
| 322 switch (cmd & 0x0f) // wait necessary conversion time | |
| 323 { | |
| 324 case CMD_ADC_256 : HAL_Delay(1); break; | |
| 325 case CMD_ADC_512 : HAL_Delay(3); break; | |
| 326 case CMD_ADC_1024: HAL_Delay(4); break; | |
| 327 case CMD_ADC_2048: HAL_Delay(6); break; | |
| 328 case CMD_ADC_4096: HAL_Delay(10); break; | |
| 329 } | |
| 330 return get_adc(); | |
| 331 } | |
| 332 | |
| 333 | |
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334 static HAL_StatusTypeDef pressure_sensor_get_data(void) |
| 38 | 335 { |
| 336 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT; | |
| 337 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT; | |
| 338 | |
| 339 D2 = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_4096, &statusReturn1); | |
| 340 D1 = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_4096, &statusReturn2); | |
| 341 | |
| 342 if(statusReturn2 > statusReturn1) // if anything is not HAL_OK (0x00) or worse | |
| 343 return statusReturn2; | |
| 344 else | |
| 345 return statusReturn1; | |
| 346 } | |
| 347 | |
| 348 | |
| 349 void pressure_sensor_get_pressure_raw(void) | |
| 350 { | |
| 351 D1 = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_4096, 0); | |
| 352 } | |
| 353 | |
| 354 | |
| 355 void pressure_sensor_get_temperature_raw(void) | |
| 356 { | |
| 357 D2 = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_4096, 0); | |
| 358 } | |
| 359 | |
| 360 | |
| 361 void pressure_calculation(void) | |
| 362 { | |
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363 if(global.I2C_SystemStatus != HAL_OK) |
| 38 | 364 return; |
| 365 | |
| 366 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(); | |
| 367 } | |
| 368 | |
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369 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void) |
| 38 | 370 { |
| 371 uint32_t local_D1; // ADC value of the pressure conversion | |
| 372 uint32_t local_D2; // ADC value of the temperature conversion | |
| 373 int32_t local_Px10; // compensated pressure value | |
| 374 int32_t local_Tx100; // compensated temperature value | |
| 375 int64_t local_dT; // int32_t, difference between actual and measured temperature | |
| 376 int64_t local_OFF; // offset at actual temperature | |
| 377 int64_t local_SENS; // sensitivity at actual temperature | |
| 378 | |
| 379 int64_t T2; | |
| 380 int64_t OFF2; | |
| 381 int64_t SENS2; | |
| 382 | |
| 383 local_D1 = D1; | |
| 384 local_D2 = D2; | |
| 385 | |
| 386 local_dT = ((int64_t)local_D2) - ((int64_t)C[5]) * 256; //pow(2,8); | |
| 387 local_OFF = ((int64_t)C[2]) * 65536 + local_dT * ((int64_t)C[4]) / 128; // pow(2,16), pow(2,7) | |
| 388 local_SENS = ((int64_t)C[1]) * 32768 + local_dT * ((int64_t)C[3]) / 256; // pow(2,15), pow(2,8) | |
| 389 | |
| 390 local_Tx100 = (int32_t)(2000 + (local_dT * ((int64_t)C[6])) / 8388608);// pow(2,23) | |
| 391 | |
| 392 | |
| 393 if(local_Tx100 < 2000) // low temperature | |
| 394 { | |
| 395 T2 = 3 * local_dT; | |
| 396 T2 *= local_dT; | |
| 397 T2 /= 8589934592; | |
| 398 | |
| 399 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 400 OFF2 *= OFF2; | |
| 401 OFF2 *= 3; | |
| 402 OFF2 /= 2; | |
| 403 | |
| 404 SENS2 = ((int64_t)local_Tx100) - 2000; | |
| 405 SENS2 *= SENS2; | |
| 406 SENS2 *= 5; | |
| 407 SENS2 /= 8; | |
| 408 | |
| 409 local_Tx100 -= (int32_t)T2; | |
| 410 local_OFF -= OFF2; | |
| 411 local_SENS -= SENS2; | |
| 412 } | |
| 413 else | |
| 414 { | |
| 415 T2 = 7 * local_dT; | |
| 416 T2 *= local_dT; | |
| 417 T2 /= 137438953472; | |
| 418 | |
| 419 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 420 OFF2 *= OFF2; | |
| 421 OFF2 /= 16; | |
| 422 | |
| 423 local_Tx100 -= (int32_t)T2; | |
| 424 local_OFF -= OFF2; | |
| 425 } | |
| 426 | |
| 427 local_Px10 = (int32_t)( | |
| 428 (((int64_t)((local_D1 * local_SENS) / 2097152)) - local_OFF) | |
| 429 / 8192 );// )) / 10; // pow(2,21), pow(2,13) | |
| 430 | |
| 431 ambient_temperature = ((float)local_Tx100) / 100; | |
| 432 ambient_pressure_mbar = ((float)local_Px10) / 10; | |
| 433 } | |
| 434 | |
| 435 | |
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436 /* |
| 38 | 437 void pressure_calculation_new(void) |
| 438 { | |
| 439 #define POW2_8 (256) | |
| 440 #define POW2_17 (131072) | |
| 441 #define POW2_6 (64) | |
| 442 #define POW2_16 (65536) | |
| 443 #define POW2_7 (128) | |
| 444 #define POW2_23 (8388608) | |
| 445 #define POW2_21 (2097152) | |
| 446 #define POW2_15 (32768) | |
| 447 #define POW2_13 (8192) | |
| 448 #define POW2_37 (137438953472) | |
| 449 #define POW2_4 (16) | |
| 450 #define POW2_33 (8589934592) | |
| 451 #define POW2_3 (8) | |
| 452 | |
| 453 int32_t P; // compensated pressure value | |
| 454 int32_t T; // compensated temperature value | |
| 455 int32_t dT; // difference between actual and measured temperature | |
| 456 int64_t OFF; // offset at actual temperature | |
| 457 int64_t SENS; | |
| 458 | |
| 459 int32_t T2; | |
| 460 int64_t OFF2; | |
| 461 int64_t SENS2; | |
| 462 | |
| 463 dT = ((int32_t)D2) - ((int32_t)C[5]) * POW2_8; | |
| 464 OFF = ((int64_t)C[2]) * POW2_16 + ((int64_t)dT) * ((int64_t)C[4]) / POW2_7; | |
| 465 SENS = ((int64_t)C[1]) * POW2_15 + ((int64_t)dT) * ((int64_t)C[3]) / POW2_8; | |
| 466 | |
| 467 T = 2000 + (dT * ((int32_t)C[6])) / POW2_23; | |
| 468 | |
| 469 | |
| 470 if(T < 2000) // low temperature | |
| 471 { | |
| 472 T2 = 3 * dT * dT; | |
| 473 T2 /= POW2_33; | |
| 474 OFF2 = ((int64_t)T) - 2000; | |
| 475 OFF2 *= OFF2; | |
| 476 OFF2 *= 3; | |
| 477 OFF2 /= 2; | |
| 478 SENS2 = ((int64_t)T) - 2000; | |
| 479 SENS2 *= SENS2; | |
| 480 SENS2 *= 5; | |
| 481 SENS2 /= POW2_3; | |
| 482 } | |
| 483 else // high temperature | |
| 484 { | |
| 485 T2 = 7 * dT * dT; | |
| 486 T2 /= POW2_37; | |
| 487 OFF2 = ((int64_t)T) - 2000; | |
| 488 OFF2 *= OFF2; | |
| 489 OFF2 /= POW2_4; | |
| 490 SENS2 = 0; | |
| 491 } | |
| 492 | |
| 493 T = T - T2; | |
| 494 OFF = OFF - OFF2; | |
| 495 SENS = SENS - SENS2; | |
| 496 | |
| 497 P = (int32_t)(((((int64_t)D1) * SENS) / POW2_21 - OFF) / POW2_13); | |
| 498 | |
| 499 ambient_temperature = ((float)T) / 100; | |
| 500 ambient_pressure_mbar = ((float)P) / 10; | |
| 501 } | |
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502 */ |
| 38 | 503 |
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504 /* |
| 38 | 505 void pressure_calculation_old(void) { |
| 506 // | |
| 507 double ambient_temperature_centigrad = 0; | |
| 508 double ambient_pressure_decimbar = 0; | |
| 509 | |
| 510 // static for debug | |
| 511 static int64_t dt = 0; | |
| 512 static int64_t temp = 0; | |
| 513 static int64_t ms_off = 0; | |
| 514 static int64_t sens = 0; | |
| 515 // | |
| 516 static int64_t ms_off2 = 0; | |
| 517 static int64_t sens2 = 0; | |
| 518 static int64_t t2 = 0; | |
| 519 | |
| 520 if((D2 == 0) || (D1 == 0)) | |
| 521 return; | |
| 522 // | |
| 523 | |
| 524 // dT = D2 - C[5] * POW2_8; | |
| 525 // T = 2000 + (dT * C[6]) / POW2_23; | |
| 526 dt = (int64_t)D2 - C5_x_2p8; | |
| 527 //temp ; // in 10 milliGrad Celcius | |
| 528 ambient_temperature_centigrad = 2000 + dt * C[6] / 8388608; | |
| 529 | |
| 530 | |
| 531 if(ambient_temperature_centigrad < 2000) // low temperature | |
| 532 { | |
| 533 t2 = 3 * dt; | |
| 534 t2 *= dt; | |
| 535 t2 /= 8589934592; | |
| 536 ms_off2 = ambient_temperature_centigrad - 2000; | |
| 537 ms_off2 *= ms_off2; | |
| 538 sens2 = ms_off2; | |
| 539 ms_off2 *= 3; | |
| 540 ms_off2 /= 2; | |
| 541 sens2 *= 5; | |
| 542 sens2 /= 8; | |
| 543 } | |
| 544 else // high temperature | |
| 545 { | |
| 546 t2 = 7 * dt; | |
| 547 t2 *= dt; | |
| 548 t2 /= 137438953472; | |
| 549 ms_off2 = ambient_temperature_centigrad - 2000; | |
| 550 ms_off2 *= ms_off2; | |
| 551 ms_off2 /= 16; | |
| 552 sens2 = 0; | |
| 553 } | |
| 554 | |
| 555 | |
| 556 // | |
| 557 | |
| 558 // pressure | |
| 559 // OFF = C[2] * POW2_16 + dT * C[4] / POW2_7; | |
| 560 // SENS = C[1] * POW2_15 + dT * C[3] / POW2_8; | |
| 561 ms_off = C[4] * dt; | |
| 562 ms_off /= 128; | |
| 563 ms_off += C2_x_2p16; | |
| 564 // | |
| 565 sens = C[3] * dt; | |
| 566 sens /= 256; | |
| 567 sens += C1_x_2p15; | |
| 568 | |
| 569 // 2nd order correction | |
| 570 ambient_temperature_centigrad -= t2; | |
| 571 ms_off -= ms_off2; | |
| 572 sens -= sens2; | |
| 573 | |
| 574 ambient_temperature = ambient_temperature_centigrad / 100; | |
| 575 // P = (D1 * SENS / POW2_21 - OFF) / POW2_13; | |
| 576 temp = D1 * sens; | |
| 577 temp /= 2097152; | |
| 578 temp -= ms_off; | |
| 579 temp /= 8192; | |
| 580 ambient_pressure_decimbar = temp; // to float/double | |
| 581 ambient_pressure_mbar = ambient_pressure_decimbar / 10; | |
| 582 } | |
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583 */ |
| 38 | 584 |
| 585 | |
| 586 /* taken from AN520 by meas-spec.com dated 9. Aug. 2011 | |
| 587 * short and int are both 16bit according to AVR/GCC google results | |
| 588 */ | |
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589 static uint8_t crc4(uint16_t n_prom[]) |
| 38 | 590 { |
| 591 uint16_t cnt; // simple counter | |
| 592 uint16_t n_rem; // crc reminder | |
| 593 uint16_t crc_read; // original value of the crc | |
| 594 uint8_t n_bit; | |
| 595 n_rem = 0x00; | |
| 596 crc_read=n_prom[7]; //save read CRC | |
| 597 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0 | |
| 598 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes | |
| 599 { // choose LSB or MSB | |
| 600 if (cnt%2==1) n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF); | |
| 601 else n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8); | |
| 602 for (n_bit = 8; n_bit > 0; n_bit--) | |
| 603 { | |
| 604 if (n_rem & (0x8000)) | |
| 605 { | |
| 606 n_rem = (n_rem << 1) ^ 0x3000; | |
| 607 } | |
| 608 else | |
| 609 { | |
| 610 n_rem = (n_rem << 1); | |
| 611 } | |
| 612 } | |
| 613 } | |
| 614 n_rem= (0x000F & (n_rem >> 12)); // // final 4-bit reminder is CRC code | |
| 615 n_prom[7]=crc_read; // restore the crc_read to its original place | |
| 616 return (n_rem ^ 0x00); | |
| 617 } | |
| 618 /* | |
| 619 void test_calculation(void) | |
| 620 { | |
| 621 C1 = 29112; | |
| 622 C2 = 26814; | |
| 623 C3 = 19125; | |
| 624 C4 = 17865; | |
| 625 C5 = 32057; | |
| 626 C6 = 31305; | |
| 627 | |
| 628 C2_x_2p16 = C2 * 65536; | |
| 629 C1_x_2p15 = C1 * 32768; | |
| 630 | |
| 631 D1 = 4944364; | |
| 632 D2 = 8198974; | |
| 633 pressure_calculation() ; | |
| 634 }; | |
| 635 */ | |
| 636 |