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 */
331
+ − 31 #include "math.h"
241
+ − 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
352
+ − 49 /* remove comment to use a predefined profile for pressure changes instead of real world data */
+ − 50 /* #define SIMULATE_PRESSURE */
+ − 51
688
+ − 52
535
+ − 53 #define PRESSURE_SURFACE_MAX_MBAR (1060.0f) /* It is unlikely that pressure at surface is greater than this value => clip to it */
331
+ − 54
688
+ − 55 #define PRESSURE_MINIMUM (0.0f)
+ − 56 #define TEMPERATURE_MINIMUM (-100.0f)
+ − 57
352
+ − 58 #define PRESSURE_SURFACE_QUE (30u) /* history buffer [minutes] for past pressure measurements */
+ − 59 #define PRESSURE_SURFACE_EVA_WINDOW (15u) /* Number of entries evaluated during instability test. Used to avoid detection while dive enters water */
+ − 60 #define PRESSURE_SURFACE_STABLE_LIMIT (10u) /* Define pressure as stable if delta (mBar) is below this value */
+ − 61 #define PRESSURE_SURFACE_DETECT_STABLE_CNT (5u) /* Event count to detect stable condition */
+ − 62 #define PRESSURE_SURFACE_UNSTABLE_LIMIT (50u) /* Define pressure as not stable if delta (mBar) is larger than this value */
+ − 63 #define PRESSURE_SURFACE_DETECT_UNSTABLE_CNT (3u) /* Event count to detect unstable condition */
+ − 64
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+ − 65
356
+ − 66 static uint8_t PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5803; /* Default Address */
+ − 67
186
+ − 68 static uint16_t get_ci_by_coef_num(uint8_t coef_num);
+ − 69 //void pressure_calculation_new(void);
+ − 70 //void pressure_calculation_old(void);
+ − 71 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void);
356
+ − 72 //static uint8_t crc4(uint16_t n_prom[]);
38
+ − 73
186
+ − 74 static HAL_StatusTypeDef pressure_sensor_get_data(void);
+ − 75 static uint32_t get_adc(void);
38
+ − 76 uint8_t pressureSensorInitSuccess = 0;
+ − 77
186
+ − 78 static uint16_t C[8] = { 1 };
+ − 79 static uint32_t D1 = 1;
+ − 80 static uint32_t D2 = 1;
356
+ − 81 //static uint8_t n_crc;
38
+ − 82
+ − 83 /*
+ − 84 short C2plus10000 = -1;
+ − 85 short C3plus200 = -1;
+ − 86 short C4minus250 = -1;
+ − 87 short UT1 = -1;
+ − 88 short C6plus100 = -1;
+ − 89 */
339
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+ − 90 static float pressure_offset = 0.0; /* Offset value which may be specified by the user via PC Software */
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+ − 91 static float temperature_offset = 0.0; /* Offset value which may be specified by the user via PC Software */
38
+ − 92
186
+ − 93 static float ambient_temperature = 0;
331
+ − 94 static float ambient_pressure_mbar = 1000.0;
+ − 95 static float surface_pressure_mbar = 1000.0;
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+ − 96 static float surface_ring_mbar[PRESSURE_SURFACE_QUE] = { 0 };
38
+ − 97
352
+ − 98 static uint8_t surface_pressure_writeIndex = 0;
+ − 99 static float surface_pressure_stable_value = 0;
+ − 100 static uint8_t surface_pressure_stable = 0;
+ − 101
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+ − 102 static uint8_t secondCounterSurfaceRing = 0;
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+ − 103 static uint8_t avgCount = 0;
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+ − 104 static float runningAvg = 0;
38
+ − 105
+ − 106 float get_temperature(void)
+ − 107 {
+ − 108 return ambient_temperature;
+ − 109 }
+ − 110
+ − 111 float get_pressure_mbar(void)
+ − 112 {
+ − 113 return ambient_pressure_mbar;
+ − 114 }
+ − 115
+ − 116 float get_surface_mbar(void)
+ − 117 {
+ − 118 return surface_pressure_mbar;
+ − 119 }
+ − 120
+ − 121
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+ − 122 void init_surface_ring(uint8_t force)
38
+ − 123 {
339
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+ − 124 if((surface_ring_mbar[0] == 0) || (force)) /* only initialize once. Keep value in place in case of an i2c recovery */
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+ − 125 {
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+ − 126 secondCounterSurfaceRing = 0; /* restart calculation */
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+ − 127 avgCount = 0;
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+ − 128 runningAvg = 0;
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+ − 129
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+ − 130 for(int i=0; i<PRESSURE_SURFACE_QUE; i++)
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+ − 131 surface_ring_mbar[i] = ambient_pressure_mbar;
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+ − 132 surface_pressure_mbar = ambient_pressure_mbar;
352
+ − 133 surface_pressure_writeIndex = 0; /* index of the oldest value in the ring buffer */
335
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+ − 134 }
38
+ − 135 }
+ − 136
352
+ − 137 uint8_t is_surface_pressure_stable(void)
+ − 138 {
+ − 139 return surface_pressure_stable;
+ − 140 }
335
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+ − 141
352
+ − 142 float set_last_surface_pressure_stable(void)
+ − 143 {
+ − 144 surface_pressure_mbar = surface_pressure_stable_value;
+ − 145 return surface_pressure_stable_value;
+ − 146 }
+ − 147
+ − 148 /* iterate backward through the history memory and evaluate the changes pressure changes during the last 30 minutes */
+ − 149 void evaluate_surface_pressure()
+ − 150 {
+ − 151 uint8_t index;
+ − 152 float lastvalue;
+ − 153 uint8_t stablecnt = 0;
+ − 154 uint8_t unstablecnt = 0;
+ − 155 uint8_t EvaluationWindow = PRESSURE_SURFACE_QUE - PRESSURE_SURFACE_EVA_WINDOW; /* do not use the latest 15 values to avoid unstable condition due to something like fin handling */
+ − 156 uint8_t EvaluatedValues = 0;
+ − 157
+ − 158 lastvalue = surface_ring_mbar[surface_pressure_writeIndex];
+ − 159 surface_pressure_stable_value = surface_ring_mbar[surface_pressure_writeIndex]; /* default: if no stable value is found return the oldest value */
+ − 160 index = surface_pressure_writeIndex;
+ − 161 surface_pressure_stable = 1;
+ − 162
+ − 163 if(index == 0)
+ − 164 {
+ − 165 index = PRESSURE_SURFACE_QUE - 1;
+ − 166 }
+ − 167 else
+ − 168 {
+ − 169 index = index - 1;
+ − 170 }
+ − 171 do
+ − 172 {
+ − 173 if((EvaluatedValues < EvaluationWindow) &&
+ − 174 (fabs(surface_pressure_stable_value - surface_ring_mbar[index]) > PRESSURE_SURFACE_UNSTABLE_LIMIT)) /* unusual change during last 30 minutes */
+ − 175 {
+ − 176 unstablecnt++;
+ − 177 if(unstablecnt > PRESSURE_SURFACE_DETECT_UNSTABLE_CNT)
+ − 178 {
+ − 179 surface_pressure_stable = 0;
+ − 180 }
+ − 181 }
+ − 182 /* search for a value which does not change for several iterations */
+ − 183 if (fabs(lastvalue - surface_ring_mbar[index]) < PRESSURE_SURFACE_STABLE_LIMIT)
+ − 184 {
+ − 185 stablecnt++;
+ − 186 }
+ − 187 else
+ − 188 {
+ − 189 stablecnt = 0;
+ − 190 }
+ − 191 if ((stablecnt >= PRESSURE_SURFACE_DETECT_STABLE_CNT) && (surface_pressure_stable == 0)&&(surface_pressure_stable_value == surface_ring_mbar[surface_pressure_writeIndex])) /* pressure is unstable => search for new stable value */
+ − 192 {
+ − 193 surface_pressure_stable_value = surface_ring_mbar[index];
+ − 194 unstablecnt = 0;
+ − 195 }
+ − 196
+ − 197 lastvalue = surface_ring_mbar[index];
+ − 198
+ − 199 if(index == 0)
+ − 200 {
+ − 201 index = PRESSURE_SURFACE_QUE - 1;
+ − 202 }
+ − 203 else
+ − 204 {
+ − 205 index = index - 1;
+ − 206 }
+ − 207 EvaluatedValues++;
+ − 208 } while (index != surface_pressure_writeIndex);
+ − 209 }
38
+ − 210 void update_surface_pressure(uint8_t call_rhythm_seconds)
+ − 211 {
331
+ − 212 if(is_init_pressure_done())
+ − 213 {
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+ − 214 runningAvg = (runningAvg * avgCount + ambient_pressure_mbar) / (avgCount +1);
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+ − 215 avgCount++;
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+ − 216 secondCounterSurfaceRing += call_rhythm_seconds;
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+ − 217
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+ − 218 if(secondCounterSurfaceRing >= 60)
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+ − 219 {
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+ − 220 if(runningAvg < PRESSURE_SURFACE_MAX_MBAR)
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+ − 221 {
352
+ − 222 surface_ring_mbar[surface_pressure_writeIndex] = runningAvg;
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+ − 223 }
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+ − 224 else
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+ − 225 {
352
+ − 226 surface_ring_mbar[surface_pressure_writeIndex] = PRESSURE_SURFACE_MAX_MBAR;
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+ − 227 }
352
+ − 228 surface_pressure_writeIndex++; /* the write index is now pointing to the oldest value in the buffer which will be overwritten next time */
331
+ − 229
352
+ − 230 if(surface_pressure_writeIndex == PRESSURE_SURFACE_QUE)
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+ − 231 {
352
+ − 232 surface_pressure_writeIndex = 0;
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+ − 233 }
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+ − 234
352
+ − 235 surface_pressure_mbar = surface_ring_mbar[surface_pressure_writeIndex]; /* 30 minutes old measurement */
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+ − 236
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+ − 237 secondCounterSurfaceRing = 0;
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+ − 238 avgCount = 1; /* use the current value as starting point but restart the weight decrement of the measurements */
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+ − 239 }
352
+ − 240 evaluate_surface_pressure();
331
+ − 241 }
38
+ − 242 }
+ − 243
186
+ − 244 #ifdef DEMOMODE
38
+ − 245 float demo_modify_temperature_helper(float bottom_mbar_diff_to_surface)
+ − 246 {
+ − 247 const float temperature_surface = 31.0;
+ − 248 const float temperature_bottom = 14.0;
+ − 249
+ − 250 const float temperature_difference = temperature_bottom - temperature_surface;
+ − 251
+ − 252 // range 0.0 - 1.0
+ − 253 float position_now = (ambient_pressure_mbar - surface_pressure_mbar) / bottom_mbar_diff_to_surface;
+ − 254
+ − 255 if(position_now <= 0)
+ − 256 return temperature_surface;
+ − 257
+ − 258 if(position_now >= 1)
+ − 259 return temperature_bottom;
+ − 260
+ − 261 return temperature_surface + (temperature_difference * position_now);
+ − 262 }
+ − 263
+ − 264
+ − 265 uint32_t demo_modify_temperature_and_pressure(int32_t divetime_in_seconds, uint8_t subseconds, float ceiling_mbar)
+ − 266 {
+ − 267
+ − 268 const float descent_rate = 4000/60;
+ − 269 const float ascent_rate = 1000/60;
+ − 270 const uint32_t seconds_descend = (1 * 60) + 30;
+ − 271 const uint32_t turbo_seconds_at_bottom_start = (0 * 60) + 0;
+ − 272 const uint32_t seconds_descend_and_bottomtime = seconds_descend + turbo_seconds_at_bottom_start + (2 * 60) + 0;
+ − 273 uint32_t time_elapsed_in_seconds;
+ − 274 static float ambient_pressure_mbar_memory = 0;
+ − 275 static uint32_t time_last_call = 0;
+ − 276
+ − 277 if(divetime_in_seconds <= seconds_descend)
+ − 278 {
+ − 279 ambient_pressure_mbar = (divetime_in_seconds * descent_rate) + ((float)(subseconds) * descent_rate) + surface_pressure_mbar;
+ − 280 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
+ − 281
+ − 282 time_last_call = divetime_in_seconds;
+ − 283 return 0;
+ − 284 }
+ − 285 else
+ − 286 if(divetime_in_seconds <= seconds_descend + turbo_seconds_at_bottom_start)
+ − 287 {
+ − 288 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar;
+ − 289 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
+ − 290 ambient_pressure_mbar_memory = ambient_pressure_mbar;
+ − 291 time_last_call = divetime_in_seconds;
+ − 292 return turbo_seconds_at_bottom_start;
+ − 293 }
+ − 294 else
+ − 295 if(divetime_in_seconds <= seconds_descend_and_bottomtime)
+ − 296 {
+ − 297 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar;
+ − 298 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
+ − 299 ambient_pressure_mbar_memory = ambient_pressure_mbar;
+ − 300 time_last_call = divetime_in_seconds;
+ − 301 return 0;
+ − 302 }
+ − 303 else
+ − 304 {
+ − 305 time_elapsed_in_seconds = divetime_in_seconds - time_last_call;
+ − 306 ambient_pressure_mbar = ambient_pressure_mbar_memory - time_elapsed_in_seconds * ascent_rate;
+ − 307
+ − 308 if(ambient_pressure_mbar < surface_pressure_mbar)
+ − 309 ambient_pressure_mbar = surface_pressure_mbar;
+ − 310 else if(ambient_pressure_mbar < ceiling_mbar)
+ − 311 ambient_pressure_mbar = ceiling_mbar;
+ − 312
+ − 313 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
+ − 314 ambient_pressure_mbar_memory = ambient_pressure_mbar;
+ − 315 time_last_call = divetime_in_seconds;
+ − 316 return 0;
+ − 317 }
+ − 318 }
186
+ − 319 #endif
38
+ − 320
+ − 321 uint8_t is_init_pressure_done(void)
+ − 322 {
+ − 323 return pressureSensorInitSuccess;
+ − 324 }
+ − 325
+ − 326 uint8_t init_pressure(void)
+ − 327 {
+ − 328 uint8_t buffer[1];
356
+ − 329 buffer[0] = 0x1E; // Reset Command
38
+ − 330 uint8_t retValue = 0xFF;
+ − 331
331
+ − 332 pressureSensorInitSuccess = false;
+ − 333
356
+ − 334 /* Probe new sensor first */
+ − 335 retValue = I2C_Master_Transmit( DEVICE_PRESSURE_MS5837, buffer, 1);
+ − 336 if(retValue != HAL_OK)
+ − 337 {
+ − 338 PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5803; // use old sensor
+ − 339 HAL_Delay(100);
488
+ − 340 I2C_DeInit();
+ − 341 HAL_Delay(100);
356
+ − 342 MX_I2C1_Init();
488
+ − 343 HAL_Delay(100);
356
+ − 344 }
+ − 345 else
+ − 346 {
+ − 347 PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5837; // Success, use new sensor
+ − 348 }
+ − 349 HAL_Delay(3); //2.8ms according to datasheet
+ − 350
+ − 351 buffer[0] = 0x1E; // Reset Command
+ − 352 retValue = 0xFF;
+ − 353
331
+ − 354 /* Send reset request to pressure sensor */
356
+ − 355 retValue = I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1);
38
+ − 356 if(retValue != HAL_OK)
+ − 357 {
+ − 358 return (HAL_StatusTypeDef)retValue;
+ − 359 }
356
+ − 360 HAL_Delay(3); //2.8ms according to datasheet
38
+ − 361
356
+ − 362 for(uint8_t i=0;i<7;i++)
38
+ − 363 {
+ − 364 C[i] = get_ci_by_coef_num(i);
+ − 365 }
356
+ − 366 // n_crc = crc4(C); // no evaluation at the moment hw 151026
38
+ − 367
241
+ − 368 if(global.I2C_SystemStatus == HAL_OK)
38
+ − 369 {
+ − 370 pressureSensorInitSuccess = 1;
331
+ − 371 retValue = pressure_update();
38
+ − 372 }
331
+ − 373 return retValue;
38
+ − 374 }
+ − 375
+ − 376
186
+ − 377 static uint32_t get_adc(void)
38
+ − 378 {
+ − 379 uint8_t buffer[1];
+ − 380 uint8_t resivebuf[4];
474
+ − 381 uint32_t answer = 0xFFFFFFFF;
186
+ − 382
38
+ − 383 buffer[0] = 0x00; // Get ADC
474
+ − 384 if(I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1) == HAL_OK)
+ − 385 {
+ − 386 if(I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 4) == HAL_OK)
+ − 387 {
+ − 388 resivebuf[3] = 0;
+ − 389 answer = 256*256 *(uint32_t)resivebuf[0] + 256 * (uint32_t)resivebuf[1] + (uint32_t)resivebuf[2];
+ − 390 }
+ − 391 }
38
+ − 392 return answer;
+ − 393 }
+ − 394
+ − 395
186
+ − 396 static uint16_t get_ci_by_coef_num(uint8_t coef_num)
38
+ − 397 {
+ − 398 uint8_t resivebuf[2];
+ − 399
+ − 400 uint8_t cmd = CMD_PROM_RD+coef_num*2;
356
+ − 401 I2C_Master_Transmit( PRESSURE_ADDRESS, &cmd, 1);
+ − 402 I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 2);
38
+ − 403 return (256*(uint16_t)resivebuf[0]) + (uint16_t)resivebuf[1];
+ − 404 }
+ − 405
+ − 406
+ − 407
+ − 408 uint8_t pressure_update(void)
+ − 409 {
+ − 410 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
+ − 411
+ − 412 statusReturn = pressure_sensor_get_data();
+ − 413 pressure_calculation();
+ − 414 return (uint8_t)statusReturn;
+ − 415 }
+ − 416
276
+ − 417 /* Switch between pressure and temperature measurement with every successful read operation */
+ − 418 void pressure_update_alternating(void)
+ − 419 {
+ − 420 static uint8_t getTemperature= 0;
+ − 421
+ − 422 if(getTemperature)
+ − 423 {
+ − 424 if(pressure_sensor_get_temperature_raw() == HAL_OK)
+ − 425 {
+ − 426 getTemperature = 0;
+ − 427 }
+ − 428 }
+ − 429 else
+ − 430 {
+ − 431 if(pressure_sensor_get_pressure_raw() == HAL_OK)
+ − 432 {
+ − 433 getTemperature = 1;
+ − 434 }
+ − 435 }
+ − 436 pressure_calculation();
+ − 437 return;
+ − 438 }
38
+ − 439
186
+ − 440 static uint32_t pressure_sensor_get_one_value(uint8_t cmd, HAL_StatusTypeDef *statusReturn)
38
+ − 441 {
+ − 442 uint8_t command = CMD_ADC_CONV + cmd;
474
+ − 443 uint32_t adcValue = 0;
38
+ − 444 HAL_StatusTypeDef statusReturnTemp = HAL_TIMEOUT;
+ − 445
356
+ − 446 statusReturnTemp = I2C_Master_Transmit( PRESSURE_ADDRESS, &command, 1);
38
+ − 447
+ − 448 if(statusReturn)
+ − 449 {
+ − 450 *statusReturn = statusReturnTemp;
+ − 451 }
479
+ − 452
+ − 453 switch (cmd & 0x0f) // wait necessary conversion time
38
+ − 454 {
488
+ − 455 case CMD_ADC_256 : HAL_Delay(2); break;
+ − 456 case CMD_ADC_512 : HAL_Delay(4); break;
+ − 457 case CMD_ADC_1024: HAL_Delay(5); break;
+ − 458 case CMD_ADC_2048: HAL_Delay(7); break;
+ − 459 case CMD_ADC_4096: HAL_Delay(11); break;
479
+ − 460 default:
+ − 461 break;
+ − 462 }
+ − 463 adcValue = get_adc();
488
+ − 464 /* if(adcValue == 0xFFFFFFFF)
479
+ − 465 {
+ − 466 if(statusReturn)
474
+ − 467 {
+ − 468 *statusReturn = HAL_ERROR;
+ − 469 }
488
+ − 470 }*/
+ − 471
474
+ − 472 return adcValue;
38
+ − 473 }
+ − 474
+ − 475
186
+ − 476 static HAL_StatusTypeDef pressure_sensor_get_data(void)
38
+ − 477 {
276
+ − 478 uint32_t requestedValue = 0;
38
+ − 479 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT;
+ − 480 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT;
+ − 481
276
+ − 482
38
+ − 483
488
+ − 484 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_4096, &statusReturn2);
276
+ − 485 if (statusReturn2 == HAL_OK)
+ − 486 {
+ − 487 D2 = requestedValue;
+ − 488 }
+ − 489
488
+ − 490 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_4096, &statusReturn1);
276
+ − 491 if (statusReturn1 == HAL_OK)
+ − 492 {
+ − 493 D1 = requestedValue;
+ − 494 }
38
+ − 495 if(statusReturn2 > statusReturn1) // if anything is not HAL_OK (0x00) or worse
+ − 496 return statusReturn2;
+ − 497 else
+ − 498 return statusReturn1;
+ − 499 }
+ − 500
+ − 501
276
+ − 502 HAL_StatusTypeDef pressure_sensor_get_pressure_raw(void)
38
+ − 503 {
276
+ − 504 uint32_t requestedValue = 0;
+ − 505 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
+ − 506
488
+ − 507 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_4096, &statusReturn);
276
+ − 508 if (statusReturn == HAL_OK)
+ − 509 {
+ − 510 D1 = requestedValue;
+ − 511 }
+ − 512
+ − 513 return statusReturn;
38
+ − 514 }
+ − 515
+ − 516
276
+ − 517 HAL_StatusTypeDef pressure_sensor_get_temperature_raw(void)
38
+ − 518 {
276
+ − 519 uint32_t requestedValue = 0;
+ − 520 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
+ − 521
488
+ − 522 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_4096, &statusReturn);
276
+ − 523 if (statusReturn == HAL_OK)
+ − 524 {
+ − 525 D2 = requestedValue;
+ − 526 }
+ − 527 return statusReturn;
38
+ − 528 }
+ − 529
+ − 530
352
+ − 531 #ifdef SIMULATE_PRESSURE
+ − 532 void pressure_simulation()
+ − 533 {
+ − 534 static uint32_t tickstart = 0;
+ − 535 static float pressure_sim_mbar = 0;
+ − 536 static uint32_t passedSecond = 0;
+ − 537 static uint32_t secondtick = 0;
+ − 538
+ − 539 uint32_t lasttick = 0;
+ − 540
+ − 541
+ − 542
+ − 543 if( tickstart == 0)
+ − 544 {
+ − 545 tickstart = HAL_GetTick(); /* init time stamp */
+ − 546 secondtick = tickstart;
+ − 547 pressure_sim_mbar = 1000;
+ − 548 }
+ − 549
+ − 550 lasttick = HAL_GetTick();
+ − 551 if(time_elapsed_ms(secondtick,lasttick) > 1000) /* one second passed since last tick */
+ − 552 {
+ − 553 secondtick = lasttick;
+ − 554 passedSecond++;
+ − 555
+ − 556 #ifdef DIVE_AFTER_LANDING
+ − 557 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */
+ − 558 else if(passedSecond < 300) pressure_sim_mbar -= 1.0; /* decrease pressure in 5 minutes target 770mbar => delta 330 */
+ − 559 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay stable 10 minutes*/
+ − 560 else if(passedSecond < 1500) pressure_sim_mbar += 0.5; /* return to 1 bar in 10 Minutes*/
+ − 561 else if(passedSecond < 1800) pressure_sim_mbar += 0.0; /* 5 minutes break */
+ − 562 else if(passedSecond < 2000) pressure_sim_mbar += 10.0; /* start dive */
+ − 563 else if(passedSecond < 2300) pressure_sim_mbar += 0.0; /* stay on depth */
+ − 564 else if(passedSecond < 2500) pressure_sim_mbar -= 10.0; /* return to surface */
+ − 565 else pressure_sim_mbar = 1000.0; /* final state */
+ − 566 #else /* short dive */
+ − 567 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */
+ − 568 else if(passedSecond < 180) pressure_sim_mbar += 10.0; /* Start dive */
+ − 569 else if(passedSecond < 300) pressure_sim_mbar += 0.0; /*stay on depth*/
+ − 570 else if(passedSecond < 460) pressure_sim_mbar -= 10.0; /* return to surface */
+ − 571 else if(passedSecond < 600) pressure_sim_mbar += 0.0; /* stay */
+ − 572 else if(passedSecond < 610) pressure_sim_mbar = 1000.0; /* get ready for second dive */
+ − 573 else if(passedSecond < 780) pressure_sim_mbar += 10.0; /* Start dive */
+ − 574 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay on depth*/
+ − 575 else if(passedSecond < 1060) pressure_sim_mbar -= 10.0; /* return to surface */
+ − 576 else if(passedSecond < 1200) pressure_sim_mbar += 0.0; /* stay */
+ − 577 else pressure_sim_mbar = 1000.0; /* final state */
+ − 578 #endif
+ − 579 }
+ − 580
+ − 581
+ − 582 ambient_pressure_mbar = pressure_sim_mbar;
+ − 583 ambient_temperature = 25.0;
+ − 584 return;
+ − 585 }
+ − 586
+ − 587 #endif
+ − 588
38
+ − 589 void pressure_calculation(void)
+ − 590 {
241
+ − 591 if(global.I2C_SystemStatus != HAL_OK)
38
+ − 592 return;
352
+ − 593
+ − 594 #ifdef SIMULATE_PRESSURE
+ − 595 pressure_simulation();
+ − 596 #else
38
+ − 597 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015();
352
+ − 598 #endif
38
+ − 599 }
+ − 600
186
+ − 601 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void)
38
+ − 602 {
335
c11ce8c885d3
Use average calculation for pressure: precondition was that pressure values jittered +- 10 HPa from one capture (once a second) to the other. Basically pressure is measured several times a second => using these values in an additional history calculation reduces the jitter down to +-1 per second
ideenmodellierer
diff
changeset
+ − 603 static float runningAvg = 0;
c11ce8c885d3
Use average calculation for pressure: precondition was that pressure values jittered +- 10 HPa from one capture (once a second) to the other. Basically pressure is measured several times a second => using these values in an additional history calculation reduces the jitter down to +-1 per second
ideenmodellierer
diff
changeset
+ − 604 static uint8_t avgCnt = 0;
c11ce8c885d3
Use average calculation for pressure: precondition was that pressure values jittered +- 10 HPa from one capture (once a second) to the other. Basically pressure is measured several times a second => using these values in an additional history calculation reduces the jitter down to +-1 per second
ideenmodellierer
diff
changeset
+ − 605
38
+ − 606 uint32_t local_D1; // ADC value of the pressure conversion
+ − 607 uint32_t local_D2; // ADC value of the temperature conversion
+ − 608 int32_t local_Px10; // compensated pressure value
+ − 609 int32_t local_Tx100; // compensated temperature value
+ − 610 int64_t local_dT; // int32_t, difference between actual and measured temperature
+ − 611 int64_t local_OFF; // offset at actual temperature
+ − 612 int64_t local_SENS; // sensitivity at actual temperature
+ − 613
331
+ − 614 float calc_pressure;
+ − 615
38
+ − 616 int64_t T2;
+ − 617 int64_t OFF2;
+ − 618 int64_t SENS2;
+ − 619
+ − 620 local_D1 = D1;
+ − 621 local_D2 = D2;
+ − 622
+ − 623 local_dT = ((int64_t)local_D2) - ((int64_t)C[5]) * 256; //pow(2,8);
+ − 624 local_OFF = ((int64_t)C[2]) * 65536 + local_dT * ((int64_t)C[4]) / 128; // pow(2,16), pow(2,7)
+ − 625 local_SENS = ((int64_t)C[1]) * 32768 + local_dT * ((int64_t)C[3]) / 256; // pow(2,15), pow(2,8)
+ − 626
+ − 627 local_Tx100 = (int32_t)(2000 + (local_dT * ((int64_t)C[6])) / 8388608);// pow(2,23)
+ − 628
+ − 629
+ − 630 if(local_Tx100 < 2000) // low temperature
+ − 631 {
+ − 632 T2 = 3 * local_dT;
+ − 633 T2 *= local_dT;
+ − 634 T2 /= 8589934592;
+ − 635
+ − 636 OFF2 = ((int64_t)local_Tx100) - 2000;
+ − 637 OFF2 *= OFF2;
+ − 638 OFF2 *= 3;
+ − 639 OFF2 /= 2;
+ − 640
+ − 641 SENS2 = ((int64_t)local_Tx100) - 2000;
+ − 642 SENS2 *= SENS2;
+ − 643 SENS2 *= 5;
+ − 644 SENS2 /= 8;
+ − 645
+ − 646 local_Tx100 -= (int32_t)T2;
+ − 647 local_OFF -= OFF2;
+ − 648 local_SENS -= SENS2;
+ − 649 }
+ − 650 else
+ − 651 {
+ − 652 T2 = 7 * local_dT;
+ − 653 T2 *= local_dT;
+ − 654 T2 /= 137438953472;
+ − 655
+ − 656 OFF2 = ((int64_t)local_Tx100) - 2000;
+ − 657 OFF2 *= OFF2;
+ − 658 OFF2 /= 16;
+ − 659
+ − 660 local_Tx100 -= (int32_t)T2;
+ − 661 local_OFF -= OFF2;
+ − 662 }
+ − 663
+ − 664 local_Px10 = (int32_t)(
+ − 665 (((int64_t)((local_D1 * local_SENS) / 2097152)) - local_OFF)
+ − 666 / 8192 );// )) / 10; // pow(2,21), pow(2,13)
+ − 667
339
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 668 ambient_temperature = ((float)local_Tx100) / 100;
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 669 ambient_temperature += temperature_offset;
331
+ − 670
688
+ − 671 if(ambient_temperature < TEMPERATURE_MINIMUM)
+ − 672 {
+ − 673 ambient_temperature = 20.0;
+ − 674 }
+ − 675
331
+ − 676 calc_pressure = ((float)local_Px10) / 10;
339
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 677 calc_pressure += pressure_offset;
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 678
480
+ − 679 runningAvg = (avgCnt * runningAvg + calc_pressure) / (avgCnt + 1);
+ − 680 if (avgCnt < 10) /* build an average considering the last measurements to have a weight "1 of 10" */
+ − 681 { /* Main reason for this is the jitter of up to +-10 HPa in surface mode which is caused */
+ − 682 avgCnt++; /* by the measurement range of the sensor which is focused on under water pressure measurement */
331
+ − 683 }
480
+ − 684 ambient_pressure_mbar = runningAvg;
688
+ − 685
+ − 686 if(ambient_pressure_mbar < PRESSURE_MINIMUM)
+ − 687 {
+ − 688 ambient_pressure_mbar = 1000.0;
+ − 689 }
38
+ − 690 }
+ − 691
+ − 692
+ − 693 /* taken from AN520 by meas-spec.com dated 9. Aug. 2011
+ − 694 * short and int are both 16bit according to AVR/GCC google results
+ − 695 */
356
+ − 696 /*static uint8_t crc4(uint16_t n_prom[])
38
+ − 697 {
+ − 698 uint16_t cnt; // simple counter
+ − 699 uint16_t n_rem; // crc reminder
+ − 700 uint16_t crc_read; // original value of the crc
+ − 701 uint8_t n_bit;
+ − 702 n_rem = 0x00;
+ − 703 crc_read=n_prom[7]; //save read CRC
+ − 704 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0
+ − 705 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes
+ − 706 { // choose LSB or MSB
+ − 707 if (cnt%2==1) n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF);
+ − 708 else n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8);
+ − 709 for (n_bit = 8; n_bit > 0; n_bit--)
+ − 710 {
+ − 711 if (n_rem & (0x8000))
+ − 712 {
+ − 713 n_rem = (n_rem << 1) ^ 0x3000;
+ − 714 }
+ − 715 else
+ − 716 {
+ − 717 n_rem = (n_rem << 1);
+ − 718 }
+ − 719 }
+ − 720 }
+ − 721 n_rem= (0x000F & (n_rem >> 12)); // // final 4-bit reminder is CRC code
+ − 722 n_prom[7]=crc_read; // restore the crc_read to its original place
+ − 723 return (n_rem ^ 0x00);
+ − 724 }
356
+ − 725
38
+ − 726 void test_calculation(void)
+ − 727 {
+ − 728 C1 = 29112;
+ − 729 C2 = 26814;
+ − 730 C3 = 19125;
+ − 731 C4 = 17865;
+ − 732 C5 = 32057;
+ − 733 C6 = 31305;
+ − 734
+ − 735 C2_x_2p16 = C2 * 65536;
+ − 736 C1_x_2p15 = C1 * 32768;
+ − 737
+ − 738 D1 = 4944364;
+ − 739 D2 = 8198974;
+ − 740 pressure_calculation() ;
+ − 741 };
+ − 742 */
339
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 743 void pressure_set_offset (float pressureOffset, float temperatureOffset)
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 744 {
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 745 if(pressure_offset != pressureOffset) /* we received a new value => reinit surface que */
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 746 {
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 747 ambient_pressure_mbar -= pressure_offset; /* revert old value */
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 748 ambient_pressure_mbar += pressureOffset; /* apply new offset */
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 749 init_surface_ring(1);
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 750 }
38
+ − 751
339
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 752 pressure_offset = pressureOffset;
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 753 temperature_offset = temperatureOffset;
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 754 }
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 755
37f45300bc2e
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
diff
changeset
+ − 756
