Mercurial > public > ostc4
annotate Small_CPU/Src/pressure.c @ 322:31e471d60797 O2_SensorSync
Added start of frame detection for HUD data
In the previous impmenentation the reception and evaluation of 15 byte were used without start detection. As a result sensor data could be stuck in case the frame sequence does not match the structure (e.g. cause by an framing error).
To resolve this in case of an invalid checksumme in combination with a data lost detection a byte based reception is startet to detect the start of a frame using the break between two transmissions.
In addition a babbling idiot protecting has been added because a faulty hardware could have an impact on the OSTC operation (high interrupt load)
| author | ideenmodellierer |
|---|---|
| date | Sun, 30 Jun 2019 21:25:58 +0200 |
| parents | 8e9c502c0b06 |
| children | b4c578caaafb |
| 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 | |
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309 /* Switch between pressure and temperature measurement with every successful read operation */ |
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310 void pressure_update_alternating(void) |
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311 { |
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312 static uint8_t getTemperature= 0; |
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313 |
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314 if(getTemperature) |
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315 { |
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316 if(pressure_sensor_get_temperature_raw() == HAL_OK) |
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317 { |
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318 getTemperature = 0; |
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319 } |
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320 } |
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321 else |
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322 { |
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323 if(pressure_sensor_get_pressure_raw() == HAL_OK) |
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324 { |
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325 getTemperature = 1; |
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326 } |
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327 } |
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328 pressure_calculation(); |
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329 return; |
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330 } |
| 38 | 331 |
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332 static uint32_t pressure_sensor_get_one_value(uint8_t cmd, HAL_StatusTypeDef *statusReturn) |
| 38 | 333 { |
| 334 uint8_t command = CMD_ADC_CONV + cmd; | |
| 335 HAL_StatusTypeDef statusReturnTemp = HAL_TIMEOUT; | |
| 336 | |
| 337 statusReturnTemp = I2C_Master_Transmit( DEVICE_PRESSURE, &command, 1); | |
| 338 | |
| 339 if(statusReturn) | |
| 340 { | |
| 341 *statusReturn = statusReturnTemp; | |
| 342 } | |
| 343 | |
| 344 switch (cmd & 0x0f) // wait necessary conversion time | |
| 345 { | |
| 346 case CMD_ADC_256 : HAL_Delay(1); break; | |
| 347 case CMD_ADC_512 : HAL_Delay(3); break; | |
| 348 case CMD_ADC_1024: HAL_Delay(4); break; | |
| 349 case CMD_ADC_2048: HAL_Delay(6); break; | |
| 350 case CMD_ADC_4096: HAL_Delay(10); break; | |
| 351 } | |
| 352 return get_adc(); | |
| 353 } | |
| 354 | |
| 355 | |
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356 static HAL_StatusTypeDef pressure_sensor_get_data(void) |
| 38 | 357 { |
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358 uint32_t requestedValue = 0; |
| 38 | 359 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT; |
| 360 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT; | |
| 361 | |
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362 |
| 38 | 363 |
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364 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn2); |
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365 if (statusReturn2 == HAL_OK) |
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366 { |
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367 D2 = requestedValue; |
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368 } |
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369 |
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370 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn1); |
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371 if (statusReturn1 == HAL_OK) |
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372 { |
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373 D1 = requestedValue; |
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374 } |
| 38 | 375 if(statusReturn2 > statusReturn1) // if anything is not HAL_OK (0x00) or worse |
| 376 return statusReturn2; | |
| 377 else | |
| 378 return statusReturn1; | |
| 379 } | |
| 380 | |
| 381 | |
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382 HAL_StatusTypeDef pressure_sensor_get_pressure_raw(void) |
| 38 | 383 { |
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384 uint32_t requestedValue = 0; |
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385 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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386 |
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387 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn); |
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388 if (statusReturn == HAL_OK) |
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389 { |
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390 D1 = requestedValue; |
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391 } |
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392 |
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393 return statusReturn; |
| 38 | 394 } |
| 395 | |
| 396 | |
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397 HAL_StatusTypeDef pressure_sensor_get_temperature_raw(void) |
| 38 | 398 { |
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399 uint32_t requestedValue = 0; |
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400 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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401 |
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402 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn); |
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403 if (statusReturn == HAL_OK) |
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404 { |
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405 D2 = requestedValue; |
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406 } |
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407 return statusReturn; |
| 38 | 408 } |
| 409 | |
| 410 | |
| 411 void pressure_calculation(void) | |
| 412 { | |
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413 if(global.I2C_SystemStatus != HAL_OK) |
| 38 | 414 return; |
| 415 | |
| 416 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(); | |
| 417 } | |
| 418 | |
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419 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void) |
| 38 | 420 { |
| 421 uint32_t local_D1; // ADC value of the pressure conversion | |
| 422 uint32_t local_D2; // ADC value of the temperature conversion | |
| 423 int32_t local_Px10; // compensated pressure value | |
| 424 int32_t local_Tx100; // compensated temperature value | |
| 425 int64_t local_dT; // int32_t, difference between actual and measured temperature | |
| 426 int64_t local_OFF; // offset at actual temperature | |
| 427 int64_t local_SENS; // sensitivity at actual temperature | |
| 428 | |
| 429 int64_t T2; | |
| 430 int64_t OFF2; | |
| 431 int64_t SENS2; | |
| 432 | |
| 433 local_D1 = D1; | |
| 434 local_D2 = D2; | |
| 435 | |
| 436 local_dT = ((int64_t)local_D2) - ((int64_t)C[5]) * 256; //pow(2,8); | |
| 437 local_OFF = ((int64_t)C[2]) * 65536 + local_dT * ((int64_t)C[4]) / 128; // pow(2,16), pow(2,7) | |
| 438 local_SENS = ((int64_t)C[1]) * 32768 + local_dT * ((int64_t)C[3]) / 256; // pow(2,15), pow(2,8) | |
| 439 | |
| 440 local_Tx100 = (int32_t)(2000 + (local_dT * ((int64_t)C[6])) / 8388608);// pow(2,23) | |
| 441 | |
| 442 | |
| 443 if(local_Tx100 < 2000) // low temperature | |
| 444 { | |
| 445 T2 = 3 * local_dT; | |
| 446 T2 *= local_dT; | |
| 447 T2 /= 8589934592; | |
| 448 | |
| 449 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 450 OFF2 *= OFF2; | |
| 451 OFF2 *= 3; | |
| 452 OFF2 /= 2; | |
| 453 | |
| 454 SENS2 = ((int64_t)local_Tx100) - 2000; | |
| 455 SENS2 *= SENS2; | |
| 456 SENS2 *= 5; | |
| 457 SENS2 /= 8; | |
| 458 | |
| 459 local_Tx100 -= (int32_t)T2; | |
| 460 local_OFF -= OFF2; | |
| 461 local_SENS -= SENS2; | |
| 462 } | |
| 463 else | |
| 464 { | |
| 465 T2 = 7 * local_dT; | |
| 466 T2 *= local_dT; | |
| 467 T2 /= 137438953472; | |
| 468 | |
| 469 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 470 OFF2 *= OFF2; | |
| 471 OFF2 /= 16; | |
| 472 | |
| 473 local_Tx100 -= (int32_t)T2; | |
| 474 local_OFF -= OFF2; | |
| 475 } | |
| 476 | |
| 477 local_Px10 = (int32_t)( | |
| 478 (((int64_t)((local_D1 * local_SENS) / 2097152)) - local_OFF) | |
| 479 / 8192 );// )) / 10; // pow(2,21), pow(2,13) | |
| 480 | |
| 481 ambient_temperature = ((float)local_Tx100) / 100; | |
| 482 ambient_pressure_mbar = ((float)local_Px10) / 10; | |
| 483 } | |
| 484 | |
| 485 | |
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486 /* |
| 38 | 487 void pressure_calculation_new(void) |
| 488 { | |
| 489 #define POW2_8 (256) | |
| 490 #define POW2_17 (131072) | |
| 491 #define POW2_6 (64) | |
| 492 #define POW2_16 (65536) | |
| 493 #define POW2_7 (128) | |
| 494 #define POW2_23 (8388608) | |
| 495 #define POW2_21 (2097152) | |
| 496 #define POW2_15 (32768) | |
| 497 #define POW2_13 (8192) | |
| 498 #define POW2_37 (137438953472) | |
| 499 #define POW2_4 (16) | |
| 500 #define POW2_33 (8589934592) | |
| 501 #define POW2_3 (8) | |
| 502 | |
| 503 int32_t P; // compensated pressure value | |
| 504 int32_t T; // compensated temperature value | |
| 505 int32_t dT; // difference between actual and measured temperature | |
| 506 int64_t OFF; // offset at actual temperature | |
| 507 int64_t SENS; | |
| 508 | |
| 509 int32_t T2; | |
| 510 int64_t OFF2; | |
| 511 int64_t SENS2; | |
| 512 | |
| 513 dT = ((int32_t)D2) - ((int32_t)C[5]) * POW2_8; | |
| 514 OFF = ((int64_t)C[2]) * POW2_16 + ((int64_t)dT) * ((int64_t)C[4]) / POW2_7; | |
| 515 SENS = ((int64_t)C[1]) * POW2_15 + ((int64_t)dT) * ((int64_t)C[3]) / POW2_8; | |
| 516 | |
| 517 T = 2000 + (dT * ((int32_t)C[6])) / POW2_23; | |
| 518 | |
| 519 | |
| 520 if(T < 2000) // low temperature | |
| 521 { | |
| 522 T2 = 3 * dT * dT; | |
| 523 T2 /= POW2_33; | |
| 524 OFF2 = ((int64_t)T) - 2000; | |
| 525 OFF2 *= OFF2; | |
| 526 OFF2 *= 3; | |
| 527 OFF2 /= 2; | |
| 528 SENS2 = ((int64_t)T) - 2000; | |
| 529 SENS2 *= SENS2; | |
| 530 SENS2 *= 5; | |
| 531 SENS2 /= POW2_3; | |
| 532 } | |
| 533 else // high temperature | |
| 534 { | |
| 535 T2 = 7 * dT * dT; | |
| 536 T2 /= POW2_37; | |
| 537 OFF2 = ((int64_t)T) - 2000; | |
| 538 OFF2 *= OFF2; | |
| 539 OFF2 /= POW2_4; | |
| 540 SENS2 = 0; | |
| 541 } | |
| 542 | |
| 543 T = T - T2; | |
| 544 OFF = OFF - OFF2; | |
| 545 SENS = SENS - SENS2; | |
| 546 | |
| 547 P = (int32_t)(((((int64_t)D1) * SENS) / POW2_21 - OFF) / POW2_13); | |
| 548 | |
| 549 ambient_temperature = ((float)T) / 100; | |
| 550 ambient_pressure_mbar = ((float)P) / 10; | |
| 551 } | |
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552 */ |
| 38 | 553 |
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554 /* |
| 38 | 555 void pressure_calculation_old(void) { |
| 556 // | |
| 557 double ambient_temperature_centigrad = 0; | |
| 558 double ambient_pressure_decimbar = 0; | |
| 559 | |
| 560 // static for debug | |
| 561 static int64_t dt = 0; | |
| 562 static int64_t temp = 0; | |
| 563 static int64_t ms_off = 0; | |
| 564 static int64_t sens = 0; | |
| 565 // | |
| 566 static int64_t ms_off2 = 0; | |
| 567 static int64_t sens2 = 0; | |
| 568 static int64_t t2 = 0; | |
| 569 | |
| 570 if((D2 == 0) || (D1 == 0)) | |
| 571 return; | |
| 572 // | |
| 573 | |
| 574 // dT = D2 - C[5] * POW2_8; | |
| 575 // T = 2000 + (dT * C[6]) / POW2_23; | |
| 576 dt = (int64_t)D2 - C5_x_2p8; | |
| 577 //temp ; // in 10 milliGrad Celcius | |
| 578 ambient_temperature_centigrad = 2000 + dt * C[6] / 8388608; | |
| 579 | |
| 580 | |
| 581 if(ambient_temperature_centigrad < 2000) // low temperature | |
| 582 { | |
| 583 t2 = 3 * dt; | |
| 584 t2 *= dt; | |
| 585 t2 /= 8589934592; | |
| 586 ms_off2 = ambient_temperature_centigrad - 2000; | |
| 587 ms_off2 *= ms_off2; | |
| 588 sens2 = ms_off2; | |
| 589 ms_off2 *= 3; | |
| 590 ms_off2 /= 2; | |
| 591 sens2 *= 5; | |
| 592 sens2 /= 8; | |
| 593 } | |
| 594 else // high temperature | |
| 595 { | |
| 596 t2 = 7 * dt; | |
| 597 t2 *= dt; | |
| 598 t2 /= 137438953472; | |
| 599 ms_off2 = ambient_temperature_centigrad - 2000; | |
| 600 ms_off2 *= ms_off2; | |
| 601 ms_off2 /= 16; | |
| 602 sens2 = 0; | |
| 603 } | |
| 604 | |
| 605 | |
| 606 // | |
| 607 | |
| 608 // pressure | |
| 609 // OFF = C[2] * POW2_16 + dT * C[4] / POW2_7; | |
| 610 // SENS = C[1] * POW2_15 + dT * C[3] / POW2_8; | |
| 611 ms_off = C[4] * dt; | |
| 612 ms_off /= 128; | |
| 613 ms_off += C2_x_2p16; | |
| 614 // | |
| 615 sens = C[3] * dt; | |
| 616 sens /= 256; | |
| 617 sens += C1_x_2p15; | |
| 618 | |
| 619 // 2nd order correction | |
| 620 ambient_temperature_centigrad -= t2; | |
| 621 ms_off -= ms_off2; | |
| 622 sens -= sens2; | |
| 623 | |
| 624 ambient_temperature = ambient_temperature_centigrad / 100; | |
| 625 // P = (D1 * SENS / POW2_21 - OFF) / POW2_13; | |
| 626 temp = D1 * sens; | |
| 627 temp /= 2097152; | |
| 628 temp -= ms_off; | |
| 629 temp /= 8192; | |
| 630 ambient_pressure_decimbar = temp; // to float/double | |
| 631 ambient_pressure_mbar = ambient_pressure_decimbar / 10; | |
| 632 } | |
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633 */ |
| 38 | 634 |
| 635 | |
| 636 /* taken from AN520 by meas-spec.com dated 9. Aug. 2011 | |
| 637 * short and int are both 16bit according to AVR/GCC google results | |
| 638 */ | |
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639 static uint8_t crc4(uint16_t n_prom[]) |
| 38 | 640 { |
| 641 uint16_t cnt; // simple counter | |
| 642 uint16_t n_rem; // crc reminder | |
| 643 uint16_t crc_read; // original value of the crc | |
| 644 uint8_t n_bit; | |
| 645 n_rem = 0x00; | |
| 646 crc_read=n_prom[7]; //save read CRC | |
| 647 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0 | |
| 648 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes | |
| 649 { // choose LSB or MSB | |
| 650 if (cnt%2==1) n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF); | |
| 651 else n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8); | |
| 652 for (n_bit = 8; n_bit > 0; n_bit--) | |
| 653 { | |
| 654 if (n_rem & (0x8000)) | |
| 655 { | |
| 656 n_rem = (n_rem << 1) ^ 0x3000; | |
| 657 } | |
| 658 else | |
| 659 { | |
| 660 n_rem = (n_rem << 1); | |
| 661 } | |
| 662 } | |
| 663 } | |
| 664 n_rem= (0x000F & (n_rem >> 12)); // // final 4-bit reminder is CRC code | |
| 665 n_prom[7]=crc_read; // restore the crc_read to its original place | |
| 666 return (n_rem ^ 0x00); | |
| 667 } | |
| 668 /* | |
| 669 void test_calculation(void) | |
| 670 { | |
| 671 C1 = 29112; | |
| 672 C2 = 26814; | |
| 673 C3 = 19125; | |
| 674 C4 = 17865; | |
| 675 C5 = 32057; | |
| 676 C6 = 31305; | |
| 677 | |
| 678 C2_x_2p16 = C2 * 65536; | |
| 679 C1_x_2p15 = C1 * 32768; | |
| 680 | |
| 681 D1 = 4944364; | |
| 682 D2 = 8198974; | |
| 683 pressure_calculation() ; | |
| 684 }; | |
| 685 */ | |
| 686 |