Mercurial > public > ostc4
annotate Small_CPU/Src/pressure.c @ 606:06ec1da5e105 v1.5.6 release
1.5.6 release
| author | heinrichsweikamp |
|---|---|
| date | Fri, 05 Feb 2021 14:50:05 +0100 |
| parents | 4644891d2f51 |
| children | 8c92f7743e14 |
| 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 */ | |
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31 #include "math.h" |
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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 | |
| 352 | 49 /* remove comment to use a predefined profile for pressure changes instead of real world data */ |
| 50 /* #define SIMULATE_PRESSURE */ | |
| 51 | |
| 535 | 52 #define PRESSURE_SURFACE_MAX_MBAR (1060.0f) /* It is unlikely that pressure at surface is greater than this value => clip to it */ |
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53 |
| 352 | 54 #define PRESSURE_SURFACE_QUE (30u) /* history buffer [minutes] for past pressure measurements */ |
| 55 #define PRESSURE_SURFACE_EVA_WINDOW (15u) /* Number of entries evaluated during instability test. Used to avoid detection while dive enters water */ | |
| 56 #define PRESSURE_SURFACE_STABLE_LIMIT (10u) /* Define pressure as stable if delta (mBar) is below this value */ | |
| 57 #define PRESSURE_SURFACE_DETECT_STABLE_CNT (5u) /* Event count to detect stable condition */ | |
| 58 #define PRESSURE_SURFACE_UNSTABLE_LIMIT (50u) /* Define pressure as not stable if delta (mBar) is larger than this value */ | |
| 59 #define PRESSURE_SURFACE_DETECT_UNSTABLE_CNT (3u) /* Event count to detect unstable condition */ | |
| 60 | |
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61 |
| 356 | 62 static uint8_t PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5803; /* Default Address */ |
| 63 | |
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64 static uint16_t get_ci_by_coef_num(uint8_t coef_num); |
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65 //void pressure_calculation_new(void); |
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66 //void pressure_calculation_old(void); |
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67 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void); |
| 356 | 68 //static uint8_t crc4(uint16_t n_prom[]); |
| 38 | 69 |
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70 static HAL_StatusTypeDef pressure_sensor_get_data(void); |
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71 static uint32_t get_adc(void); |
| 38 | 72 uint8_t pressureSensorInitSuccess = 0; |
| 73 | |
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74 static uint16_t C[8] = { 1 }; |
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75 static uint32_t D1 = 1; |
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76 static uint32_t D2 = 1; |
| 356 | 77 //static uint8_t n_crc; |
| 38 | 78 |
| 79 /* | |
| 80 short C2plus10000 = -1; | |
| 81 short C3plus200 = -1; | |
| 82 short C4minus250 = -1; | |
| 83 short UT1 = -1; | |
| 84 short C6plus100 = -1; | |
| 85 */ | |
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86 static float pressure_offset = 0.0; /* Offset value which may be specified by the user via PC Software */ |
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87 static float temperature_offset = 0.0; /* Offset value which may be specified by the user via PC Software */ |
| 38 | 88 |
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89 static float ambient_temperature = 0; |
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90 static float ambient_pressure_mbar = 1000.0; |
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91 static float surface_pressure_mbar = 1000.0; |
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92 static float surface_ring_mbar[PRESSURE_SURFACE_QUE] = { 0 }; |
| 38 | 93 |
| 352 | 94 static uint8_t surface_pressure_writeIndex = 0; |
| 95 static float surface_pressure_stable_value = 0; | |
| 96 static uint8_t surface_pressure_stable = 0; | |
| 97 | |
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98 static uint8_t secondCounterSurfaceRing = 0; |
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99 static uint8_t avgCount = 0; |
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100 static float runningAvg = 0; |
| 38 | 101 |
| 102 float get_temperature(void) | |
| 103 { | |
| 104 return ambient_temperature; | |
| 105 } | |
| 106 | |
| 107 float get_pressure_mbar(void) | |
| 108 { | |
| 109 return ambient_pressure_mbar; | |
| 110 } | |
| 111 | |
| 112 float get_surface_mbar(void) | |
| 113 { | |
| 114 return surface_pressure_mbar; | |
| 115 } | |
| 116 | |
| 117 | |
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118 void init_surface_ring(uint8_t force) |
| 38 | 119 { |
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120 if((surface_ring_mbar[0] == 0) || (force)) /* only initialize once. Keep value in place in case of an i2c recovery */ |
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121 { |
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122 secondCounterSurfaceRing = 0; /* restart calculation */ |
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123 avgCount = 0; |
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124 runningAvg = 0; |
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125 |
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126 for(int i=0; i<PRESSURE_SURFACE_QUE; i++) |
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127 surface_ring_mbar[i] = ambient_pressure_mbar; |
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128 surface_pressure_mbar = ambient_pressure_mbar; |
| 352 | 129 surface_pressure_writeIndex = 0; /* index of the oldest value in the ring buffer */ |
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130 } |
| 38 | 131 } |
| 132 | |
| 352 | 133 uint8_t is_surface_pressure_stable(void) |
| 134 { | |
| 135 return surface_pressure_stable; | |
| 136 } | |
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137 |
| 352 | 138 float set_last_surface_pressure_stable(void) |
| 139 { | |
| 140 surface_pressure_mbar = surface_pressure_stable_value; | |
| 141 return surface_pressure_stable_value; | |
| 142 } | |
| 143 | |
| 144 /* iterate backward through the history memory and evaluate the changes pressure changes during the last 30 minutes */ | |
| 145 void evaluate_surface_pressure() | |
| 146 { | |
| 147 uint8_t index; | |
| 148 float lastvalue; | |
| 149 uint8_t stablecnt = 0; | |
| 150 uint8_t unstablecnt = 0; | |
| 151 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 */ | |
| 152 uint8_t EvaluatedValues = 0; | |
| 153 | |
| 154 lastvalue = surface_ring_mbar[surface_pressure_writeIndex]; | |
| 155 surface_pressure_stable_value = surface_ring_mbar[surface_pressure_writeIndex]; /* default: if no stable value is found return the oldest value */ | |
| 156 index = surface_pressure_writeIndex; | |
| 157 surface_pressure_stable = 1; | |
| 158 | |
| 159 if(index == 0) | |
| 160 { | |
| 161 index = PRESSURE_SURFACE_QUE - 1; | |
| 162 } | |
| 163 else | |
| 164 { | |
| 165 index = index - 1; | |
| 166 } | |
| 167 do | |
| 168 { | |
| 169 if((EvaluatedValues < EvaluationWindow) && | |
| 170 (fabs(surface_pressure_stable_value - surface_ring_mbar[index]) > PRESSURE_SURFACE_UNSTABLE_LIMIT)) /* unusual change during last 30 minutes */ | |
| 171 { | |
| 172 unstablecnt++; | |
| 173 if(unstablecnt > PRESSURE_SURFACE_DETECT_UNSTABLE_CNT) | |
| 174 { | |
| 175 surface_pressure_stable = 0; | |
| 176 } | |
| 177 } | |
| 178 /* search for a value which does not change for several iterations */ | |
| 179 if (fabs(lastvalue - surface_ring_mbar[index]) < PRESSURE_SURFACE_STABLE_LIMIT) | |
| 180 { | |
| 181 stablecnt++; | |
| 182 } | |
| 183 else | |
| 184 { | |
| 185 stablecnt = 0; | |
| 186 } | |
| 187 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 */ | |
| 188 { | |
| 189 surface_pressure_stable_value = surface_ring_mbar[index]; | |
| 190 unstablecnt = 0; | |
| 191 } | |
| 192 | |
| 193 lastvalue = surface_ring_mbar[index]; | |
| 194 | |
| 195 if(index == 0) | |
| 196 { | |
| 197 index = PRESSURE_SURFACE_QUE - 1; | |
| 198 } | |
| 199 else | |
| 200 { | |
| 201 index = index - 1; | |
| 202 } | |
| 203 EvaluatedValues++; | |
| 204 } while (index != surface_pressure_writeIndex); | |
| 205 } | |
| 38 | 206 void update_surface_pressure(uint8_t call_rhythm_seconds) |
| 207 { | |
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208 if(is_init_pressure_done()) |
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209 { |
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210 runningAvg = (runningAvg * avgCount + ambient_pressure_mbar) / (avgCount +1); |
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211 avgCount++; |
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212 secondCounterSurfaceRing += call_rhythm_seconds; |
| 38 | 213 |
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214 if(secondCounterSurfaceRing >= 60) |
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215 { |
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216 if(runningAvg < PRESSURE_SURFACE_MAX_MBAR) |
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217 { |
| 352 | 218 surface_ring_mbar[surface_pressure_writeIndex] = runningAvg; |
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219 } |
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220 else |
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221 { |
| 352 | 222 surface_ring_mbar[surface_pressure_writeIndex] = PRESSURE_SURFACE_MAX_MBAR; |
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223 } |
| 352 | 224 surface_pressure_writeIndex++; /* the write index is now pointing to the oldest value in the buffer which will be overwritten next time */ |
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225 |
| 352 | 226 if(surface_pressure_writeIndex == PRESSURE_SURFACE_QUE) |
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227 { |
| 352 | 228 surface_pressure_writeIndex = 0; |
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229 } |
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230 |
| 352 | 231 surface_pressure_mbar = surface_ring_mbar[surface_pressure_writeIndex]; /* 30 minutes old measurement */ |
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232 |
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233 secondCounterSurfaceRing = 0; |
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234 avgCount = 1; /* use the current value as starting point but restart the weight decrement of the measurements */ |
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235 } |
| 352 | 236 evaluate_surface_pressure(); |
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237 } |
| 38 | 238 } |
| 239 | |
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240 #ifdef DEMOMODE |
| 38 | 241 float demo_modify_temperature_helper(float bottom_mbar_diff_to_surface) |
| 242 { | |
| 243 const float temperature_surface = 31.0; | |
| 244 const float temperature_bottom = 14.0; | |
| 245 | |
| 246 const float temperature_difference = temperature_bottom - temperature_surface; | |
| 247 | |
| 248 // range 0.0 - 1.0 | |
| 249 float position_now = (ambient_pressure_mbar - surface_pressure_mbar) / bottom_mbar_diff_to_surface; | |
| 250 | |
| 251 if(position_now <= 0) | |
| 252 return temperature_surface; | |
| 253 | |
| 254 if(position_now >= 1) | |
| 255 return temperature_bottom; | |
| 256 | |
| 257 return temperature_surface + (temperature_difference * position_now); | |
| 258 } | |
| 259 | |
| 260 | |
| 261 uint32_t demo_modify_temperature_and_pressure(int32_t divetime_in_seconds, uint8_t subseconds, float ceiling_mbar) | |
| 262 { | |
| 263 | |
| 264 const float descent_rate = 4000/60; | |
| 265 const float ascent_rate = 1000/60; | |
| 266 const uint32_t seconds_descend = (1 * 60) + 30; | |
| 267 const uint32_t turbo_seconds_at_bottom_start = (0 * 60) + 0; | |
| 268 const uint32_t seconds_descend_and_bottomtime = seconds_descend + turbo_seconds_at_bottom_start + (2 * 60) + 0; | |
| 269 uint32_t time_elapsed_in_seconds; | |
| 270 static float ambient_pressure_mbar_memory = 0; | |
| 271 static uint32_t time_last_call = 0; | |
| 272 | |
| 273 if(divetime_in_seconds <= seconds_descend) | |
| 274 { | |
| 275 ambient_pressure_mbar = (divetime_in_seconds * descent_rate) + ((float)(subseconds) * descent_rate) + surface_pressure_mbar; | |
| 276 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 277 | |
| 278 time_last_call = divetime_in_seconds; | |
| 279 return 0; | |
| 280 } | |
| 281 else | |
| 282 if(divetime_in_seconds <= seconds_descend + turbo_seconds_at_bottom_start) | |
| 283 { | |
| 284 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar; | |
| 285 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 286 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 287 time_last_call = divetime_in_seconds; | |
| 288 return turbo_seconds_at_bottom_start; | |
| 289 } | |
| 290 else | |
| 291 if(divetime_in_seconds <= seconds_descend_and_bottomtime) | |
| 292 { | |
| 293 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar; | |
| 294 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 295 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 296 time_last_call = divetime_in_seconds; | |
| 297 return 0; | |
| 298 } | |
| 299 else | |
| 300 { | |
| 301 time_elapsed_in_seconds = divetime_in_seconds - time_last_call; | |
| 302 ambient_pressure_mbar = ambient_pressure_mbar_memory - time_elapsed_in_seconds * ascent_rate; | |
| 303 | |
| 304 if(ambient_pressure_mbar < surface_pressure_mbar) | |
| 305 ambient_pressure_mbar = surface_pressure_mbar; | |
| 306 else if(ambient_pressure_mbar < ceiling_mbar) | |
| 307 ambient_pressure_mbar = ceiling_mbar; | |
| 308 | |
| 309 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 310 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 311 time_last_call = divetime_in_seconds; | |
| 312 return 0; | |
| 313 } | |
| 314 } | |
|
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315 #endif |
| 38 | 316 |
| 317 uint8_t is_init_pressure_done(void) | |
| 318 { | |
| 319 return pressureSensorInitSuccess; | |
| 320 } | |
| 321 | |
| 322 uint8_t init_pressure(void) | |
| 323 { | |
| 324 uint8_t buffer[1]; | |
| 356 | 325 buffer[0] = 0x1E; // Reset Command |
| 38 | 326 uint8_t retValue = 0xFF; |
| 327 | |
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328 pressureSensorInitSuccess = false; |
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329 |
| 356 | 330 /* Probe new sensor first */ |
| 331 retValue = I2C_Master_Transmit( DEVICE_PRESSURE_MS5837, buffer, 1); | |
| 332 if(retValue != HAL_OK) | |
| 333 { | |
| 334 PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5803; // use old sensor | |
| 335 HAL_Delay(100); | |
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336 I2C_DeInit(); |
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337 HAL_Delay(100); |
| 356 | 338 MX_I2C1_Init(); |
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339 HAL_Delay(100); |
| 356 | 340 } |
| 341 else | |
| 342 { | |
| 343 PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5837; // Success, use new sensor | |
| 344 } | |
| 345 HAL_Delay(3); //2.8ms according to datasheet | |
| 346 | |
| 347 buffer[0] = 0x1E; // Reset Command | |
| 348 retValue = 0xFF; | |
| 349 | |
|
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350 /* Send reset request to pressure sensor */ |
| 356 | 351 retValue = I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1); |
| 38 | 352 if(retValue != HAL_OK) |
| 353 { | |
| 354 return (HAL_StatusTypeDef)retValue; | |
| 355 } | |
| 356 | 356 HAL_Delay(3); //2.8ms according to datasheet |
| 38 | 357 |
| 356 | 358 for(uint8_t i=0;i<7;i++) |
| 38 | 359 { |
| 360 C[i] = get_ci_by_coef_num(i); | |
| 361 } | |
| 356 | 362 // n_crc = crc4(C); // no evaluation at the moment hw 151026 |
| 38 | 363 |
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364 if(global.I2C_SystemStatus == HAL_OK) |
| 38 | 365 { |
| 366 pressureSensorInitSuccess = 1; | |
|
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367 retValue = pressure_update(); |
| 38 | 368 } |
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369 return retValue; |
| 38 | 370 } |
| 371 | |
| 372 | |
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373 static uint32_t get_adc(void) |
| 38 | 374 { |
| 375 uint8_t buffer[1]; | |
| 376 uint8_t resivebuf[4]; | |
|
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377 uint32_t answer = 0xFFFFFFFF; |
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378 |
| 38 | 379 buffer[0] = 0x00; // Get ADC |
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380 if(I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1) == HAL_OK) |
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381 { |
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382 if(I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 4) == HAL_OK) |
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383 { |
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384 resivebuf[3] = 0; |
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385 answer = 256*256 *(uint32_t)resivebuf[0] + 256 * (uint32_t)resivebuf[1] + (uint32_t)resivebuf[2]; |
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386 } |
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387 } |
| 38 | 388 return answer; |
| 389 } | |
| 390 | |
| 391 | |
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392 static uint16_t get_ci_by_coef_num(uint8_t coef_num) |
| 38 | 393 { |
| 394 uint8_t resivebuf[2]; | |
| 395 | |
| 396 uint8_t cmd = CMD_PROM_RD+coef_num*2; | |
| 356 | 397 I2C_Master_Transmit( PRESSURE_ADDRESS, &cmd, 1); |
| 398 I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 2); | |
| 38 | 399 return (256*(uint16_t)resivebuf[0]) + (uint16_t)resivebuf[1]; |
| 400 } | |
| 401 | |
| 402 | |
| 403 | |
| 404 uint8_t pressure_update(void) | |
| 405 { | |
| 406 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; | |
| 407 | |
| 408 statusReturn = pressure_sensor_get_data(); | |
| 409 pressure_calculation(); | |
| 410 return (uint8_t)statusReturn; | |
| 411 } | |
| 412 | |
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413 /* Switch between pressure and temperature measurement with every successful read operation */ |
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414 void pressure_update_alternating(void) |
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415 { |
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416 static uint8_t getTemperature= 0; |
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417 |
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418 if(getTemperature) |
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419 { |
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420 if(pressure_sensor_get_temperature_raw() == HAL_OK) |
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421 { |
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422 getTemperature = 0; |
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423 } |
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424 } |
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425 else |
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426 { |
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427 if(pressure_sensor_get_pressure_raw() == HAL_OK) |
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428 { |
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429 getTemperature = 1; |
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430 } |
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431 } |
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432 pressure_calculation(); |
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433 return; |
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434 } |
| 38 | 435 |
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436 static uint32_t pressure_sensor_get_one_value(uint8_t cmd, HAL_StatusTypeDef *statusReturn) |
| 38 | 437 { |
| 438 uint8_t command = CMD_ADC_CONV + cmd; | |
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439 uint32_t adcValue = 0; |
| 38 | 440 HAL_StatusTypeDef statusReturnTemp = HAL_TIMEOUT; |
| 441 | |
| 356 | 442 statusReturnTemp = I2C_Master_Transmit( PRESSURE_ADDRESS, &command, 1); |
| 38 | 443 |
| 444 if(statusReturn) | |
| 445 { | |
| 446 *statusReturn = statusReturnTemp; | |
| 447 } | |
| 479 | 448 |
| 449 switch (cmd & 0x0f) // wait necessary conversion time | |
| 38 | 450 { |
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451 case CMD_ADC_256 : HAL_Delay(2); break; |
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452 case CMD_ADC_512 : HAL_Delay(4); break; |
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453 case CMD_ADC_1024: HAL_Delay(5); break; |
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454 case CMD_ADC_2048: HAL_Delay(7); break; |
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455 case CMD_ADC_4096: HAL_Delay(11); break; |
| 479 | 456 default: |
| 457 break; | |
| 458 } | |
| 459 adcValue = get_adc(); | |
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460 /* if(adcValue == 0xFFFFFFFF) |
| 479 | 461 { |
| 462 if(statusReturn) | |
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463 { |
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464 *statusReturn = HAL_ERROR; |
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465 } |
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466 }*/ |
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467 |
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468 return adcValue; |
| 38 | 469 } |
| 470 | |
| 471 | |
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472 static HAL_StatusTypeDef pressure_sensor_get_data(void) |
| 38 | 473 { |
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474 uint32_t requestedValue = 0; |
| 38 | 475 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT; |
| 476 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT; | |
| 477 | |
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478 |
| 38 | 479 |
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480 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_4096, &statusReturn2); |
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481 if (statusReturn2 == HAL_OK) |
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482 { |
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483 D2 = requestedValue; |
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484 } |
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485 |
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486 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_4096, &statusReturn1); |
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487 if (statusReturn1 == HAL_OK) |
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488 { |
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489 D1 = requestedValue; |
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490 } |
| 38 | 491 if(statusReturn2 > statusReturn1) // if anything is not HAL_OK (0x00) or worse |
| 492 return statusReturn2; | |
| 493 else | |
| 494 return statusReturn1; | |
| 495 } | |
| 496 | |
| 497 | |
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498 HAL_StatusTypeDef pressure_sensor_get_pressure_raw(void) |
| 38 | 499 { |
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500 uint32_t requestedValue = 0; |
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501 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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502 |
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503 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_4096, &statusReturn); |
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504 if (statusReturn == HAL_OK) |
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505 { |
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506 D1 = requestedValue; |
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507 } |
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508 |
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509 return statusReturn; |
| 38 | 510 } |
| 511 | |
| 512 | |
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513 HAL_StatusTypeDef pressure_sensor_get_temperature_raw(void) |
| 38 | 514 { |
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515 uint32_t requestedValue = 0; |
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516 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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517 |
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518 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_4096, &statusReturn); |
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519 if (statusReturn == HAL_OK) |
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520 { |
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521 D2 = requestedValue; |
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522 } |
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523 return statusReturn; |
| 38 | 524 } |
| 525 | |
| 526 | |
| 352 | 527 #ifdef SIMULATE_PRESSURE |
| 528 void pressure_simulation() | |
| 529 { | |
| 530 static uint32_t tickstart = 0; | |
| 531 static float pressure_sim_mbar = 0; | |
| 532 static uint32_t passedSecond = 0; | |
| 533 static uint32_t secondtick = 0; | |
| 534 | |
| 535 uint32_t lasttick = 0; | |
| 536 | |
| 537 | |
| 538 | |
| 539 if( tickstart == 0) | |
| 540 { | |
| 541 tickstart = HAL_GetTick(); /* init time stamp */ | |
| 542 secondtick = tickstart; | |
| 543 pressure_sim_mbar = 1000; | |
| 544 } | |
| 545 | |
| 546 lasttick = HAL_GetTick(); | |
| 547 if(time_elapsed_ms(secondtick,lasttick) > 1000) /* one second passed since last tick */ | |
| 548 { | |
| 549 secondtick = lasttick; | |
| 550 passedSecond++; | |
| 551 | |
| 552 #ifdef DIVE_AFTER_LANDING | |
| 553 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */ | |
| 554 else if(passedSecond < 300) pressure_sim_mbar -= 1.0; /* decrease pressure in 5 minutes target 770mbar => delta 330 */ | |
| 555 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay stable 10 minutes*/ | |
| 556 else if(passedSecond < 1500) pressure_sim_mbar += 0.5; /* return to 1 bar in 10 Minutes*/ | |
| 557 else if(passedSecond < 1800) pressure_sim_mbar += 0.0; /* 5 minutes break */ | |
| 558 else if(passedSecond < 2000) pressure_sim_mbar += 10.0; /* start dive */ | |
| 559 else if(passedSecond < 2300) pressure_sim_mbar += 0.0; /* stay on depth */ | |
| 560 else if(passedSecond < 2500) pressure_sim_mbar -= 10.0; /* return to surface */ | |
| 561 else pressure_sim_mbar = 1000.0; /* final state */ | |
| 562 #else /* short dive */ | |
| 563 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */ | |
| 564 else if(passedSecond < 180) pressure_sim_mbar += 10.0; /* Start dive */ | |
| 565 else if(passedSecond < 300) pressure_sim_mbar += 0.0; /*stay on depth*/ | |
| 566 else if(passedSecond < 460) pressure_sim_mbar -= 10.0; /* return to surface */ | |
| 567 else if(passedSecond < 600) pressure_sim_mbar += 0.0; /* stay */ | |
| 568 else if(passedSecond < 610) pressure_sim_mbar = 1000.0; /* get ready for second dive */ | |
| 569 else if(passedSecond < 780) pressure_sim_mbar += 10.0; /* Start dive */ | |
| 570 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay on depth*/ | |
| 571 else if(passedSecond < 1060) pressure_sim_mbar -= 10.0; /* return to surface */ | |
| 572 else if(passedSecond < 1200) pressure_sim_mbar += 0.0; /* stay */ | |
| 573 else pressure_sim_mbar = 1000.0; /* final state */ | |
| 574 #endif | |
| 575 } | |
| 576 | |
| 577 | |
| 578 ambient_pressure_mbar = pressure_sim_mbar; | |
| 579 ambient_temperature = 25.0; | |
| 580 return; | |
| 581 } | |
| 582 | |
| 583 #endif | |
| 584 | |
| 38 | 585 void pressure_calculation(void) |
| 586 { | |
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587 if(global.I2C_SystemStatus != HAL_OK) |
| 38 | 588 return; |
| 352 | 589 |
| 590 #ifdef SIMULATE_PRESSURE | |
| 591 pressure_simulation(); | |
| 592 #else | |
| 38 | 593 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(); |
| 352 | 594 #endif |
| 38 | 595 } |
| 596 | |
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597 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void) |
| 38 | 598 { |
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599 static float runningAvg = 0; |
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600 static uint8_t avgCnt = 0; |
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601 |
| 38 | 602 uint32_t local_D1; // ADC value of the pressure conversion |
| 603 uint32_t local_D2; // ADC value of the temperature conversion | |
| 604 int32_t local_Px10; // compensated pressure value | |
| 605 int32_t local_Tx100; // compensated temperature value | |
| 606 int64_t local_dT; // int32_t, difference between actual and measured temperature | |
| 607 int64_t local_OFF; // offset at actual temperature | |
| 608 int64_t local_SENS; // sensitivity at actual temperature | |
| 609 | |
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610 float calc_pressure; |
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611 |
| 38 | 612 int64_t T2; |
| 613 int64_t OFF2; | |
| 614 int64_t SENS2; | |
| 615 | |
| 616 local_D1 = D1; | |
| 617 local_D2 = D2; | |
| 618 | |
| 619 local_dT = ((int64_t)local_D2) - ((int64_t)C[5]) * 256; //pow(2,8); | |
| 620 local_OFF = ((int64_t)C[2]) * 65536 + local_dT * ((int64_t)C[4]) / 128; // pow(2,16), pow(2,7) | |
| 621 local_SENS = ((int64_t)C[1]) * 32768 + local_dT * ((int64_t)C[3]) / 256; // pow(2,15), pow(2,8) | |
| 622 | |
| 623 local_Tx100 = (int32_t)(2000 + (local_dT * ((int64_t)C[6])) / 8388608);// pow(2,23) | |
| 624 | |
| 625 | |
| 626 if(local_Tx100 < 2000) // low temperature | |
| 627 { | |
| 628 T2 = 3 * local_dT; | |
| 629 T2 *= local_dT; | |
| 630 T2 /= 8589934592; | |
| 631 | |
| 632 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 633 OFF2 *= OFF2; | |
| 634 OFF2 *= 3; | |
| 635 OFF2 /= 2; | |
| 636 | |
| 637 SENS2 = ((int64_t)local_Tx100) - 2000; | |
| 638 SENS2 *= SENS2; | |
| 639 SENS2 *= 5; | |
| 640 SENS2 /= 8; | |
| 641 | |
| 642 local_Tx100 -= (int32_t)T2; | |
| 643 local_OFF -= OFF2; | |
| 644 local_SENS -= SENS2; | |
| 645 } | |
| 646 else | |
| 647 { | |
| 648 T2 = 7 * local_dT; | |
| 649 T2 *= local_dT; | |
| 650 T2 /= 137438953472; | |
| 651 | |
| 652 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 653 OFF2 *= OFF2; | |
| 654 OFF2 /= 16; | |
| 655 | |
| 656 local_Tx100 -= (int32_t)T2; | |
| 657 local_OFF -= OFF2; | |
| 658 } | |
| 659 | |
| 660 local_Px10 = (int32_t)( | |
| 661 (((int64_t)((local_D1 * local_SENS) / 2097152)) - local_OFF) | |
| 662 / 8192 );// )) / 10; // pow(2,21), pow(2,13) | |
| 663 | |
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664 ambient_temperature = ((float)local_Tx100) / 100; |
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665 ambient_temperature += temperature_offset; |
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666 |
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667 calc_pressure = ((float)local_Px10) / 10; |
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668 calc_pressure += pressure_offset; |
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669 |
| 480 | 670 runningAvg = (avgCnt * runningAvg + calc_pressure) / (avgCnt + 1); |
| 671 if (avgCnt < 10) /* build an average considering the last measurements to have a weight "1 of 10" */ | |
| 672 { /* Main reason for this is the jitter of up to +-10 HPa in surface mode which is caused */ | |
| 673 avgCnt++; /* by the measurement range of the sensor which is focused on under water pressure measurement */ | |
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674 } |
| 480 | 675 ambient_pressure_mbar = runningAvg; |
| 38 | 676 } |
| 677 | |
| 678 | |
| 679 /* taken from AN520 by meas-spec.com dated 9. Aug. 2011 | |
| 680 * short and int are both 16bit according to AVR/GCC google results | |
| 681 */ | |
| 356 | 682 /*static uint8_t crc4(uint16_t n_prom[]) |
| 38 | 683 { |
| 684 uint16_t cnt; // simple counter | |
| 685 uint16_t n_rem; // crc reminder | |
| 686 uint16_t crc_read; // original value of the crc | |
| 687 uint8_t n_bit; | |
| 688 n_rem = 0x00; | |
| 689 crc_read=n_prom[7]; //save read CRC | |
| 690 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0 | |
| 691 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes | |
| 692 { // choose LSB or MSB | |
| 693 if (cnt%2==1) n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF); | |
| 694 else n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8); | |
| 695 for (n_bit = 8; n_bit > 0; n_bit--) | |
| 696 { | |
| 697 if (n_rem & (0x8000)) | |
| 698 { | |
| 699 n_rem = (n_rem << 1) ^ 0x3000; | |
| 700 } | |
| 701 else | |
| 702 { | |
| 703 n_rem = (n_rem << 1); | |
| 704 } | |
| 705 } | |
| 706 } | |
| 707 n_rem= (0x000F & (n_rem >> 12)); // // final 4-bit reminder is CRC code | |
| 708 n_prom[7]=crc_read; // restore the crc_read to its original place | |
| 709 return (n_rem ^ 0x00); | |
| 710 } | |
| 356 | 711 |
| 38 | 712 void test_calculation(void) |
| 713 { | |
| 714 C1 = 29112; | |
| 715 C2 = 26814; | |
| 716 C3 = 19125; | |
| 717 C4 = 17865; | |
| 718 C5 = 32057; | |
| 719 C6 = 31305; | |
| 720 | |
| 721 C2_x_2p16 = C2 * 65536; | |
| 722 C1_x_2p15 = C1 * 32768; | |
| 723 | |
| 724 D1 = 4944364; | |
| 725 D2 = 8198974; | |
| 726 pressure_calculation() ; | |
| 727 }; | |
| 728 */ | |
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729 void pressure_set_offset (float pressureOffset, float temperatureOffset) |
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730 { |
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731 if(pressure_offset != pressureOffset) /* we received a new value => reinit surface que */ |
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732 { |
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733 ambient_pressure_mbar -= pressure_offset; /* revert old value */ |
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734 ambient_pressure_mbar += pressureOffset; /* apply new offset */ |
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735 init_surface_ring(1); |
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736 } |
| 38 | 737 |
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738 pressure_offset = pressureOffset; |
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739 temperature_offset = temperatureOffset; |
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740 } |
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741 |
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742 |