Mercurial > public > ostc4
annotate Small_CPU/Src/pressure.c @ 861:ad96f99ebc78 Evo_2_23
Synchronize ADC and UART activities:
depending on the cable configuration the UART sensor operation may have an impact to the ADC measurement (peaks). To avoid this the ADC measurements are now only started in case no UART communication is pending.
| author | Ideenmodellierer |
|---|---|
| date | Tue, 07 May 2024 21:25:25 +0200 |
| parents | 08ea8e9d6cfe |
| children | 3311b720a072 |
| 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 | |
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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 */ |
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54 |
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55 #define PRESSURE_MINIMUM (0.0f) |
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56 #define TEMPERATURE_MINIMUM (-100.0f) |
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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 | |
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68 static uint16_t get_ci_by_coef_num(uint8_t coef_num); |
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69 //void pressure_calculation_new(void); |
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70 //void pressure_calculation_old(void); |
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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 |
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74 static HAL_StatusTypeDef pressure_sensor_get_data(void); |
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75 static uint32_t get_adc(void); |
| 38 | 76 uint8_t pressureSensorInitSuccess = 0; |
| 77 | |
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78 static uint16_t C[8] = { 1 }; |
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79 static uint32_t D1 = 1; |
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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 */ | |
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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 |
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93 static float ambient_temperature = 0; |
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94 static float ambient_pressure_mbar = 1000.0; |
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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 { |
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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; |
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133 surface_pressure_stable_value = surface_pressure_mbar; |
| 352 | 134 surface_pressure_writeIndex = 0; /* index of the oldest value in the ring buffer */ |
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135 } |
| 38 | 136 } |
| 137 | |
| 352 | 138 uint8_t is_surface_pressure_stable(void) |
| 139 { | |
| 140 return surface_pressure_stable; | |
| 141 } | |
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142 |
| 352 | 143 float set_last_surface_pressure_stable(void) |
| 144 { | |
| 145 surface_pressure_mbar = surface_pressure_stable_value; | |
| 146 return surface_pressure_stable_value; | |
| 147 } | |
| 148 | |
| 149 /* iterate backward through the history memory and evaluate the changes pressure changes during the last 30 minutes */ | |
| 150 void evaluate_surface_pressure() | |
| 151 { | |
| 152 uint8_t index; | |
| 153 float lastvalue; | |
| 154 uint8_t stablecnt = 0; | |
| 155 uint8_t unstablecnt = 0; | |
| 156 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 */ | |
| 157 uint8_t EvaluatedValues = 0; | |
| 158 | |
| 159 lastvalue = surface_ring_mbar[surface_pressure_writeIndex]; | |
| 160 surface_pressure_stable_value = surface_ring_mbar[surface_pressure_writeIndex]; /* default: if no stable value is found return the oldest value */ | |
| 161 index = surface_pressure_writeIndex; | |
| 162 surface_pressure_stable = 1; | |
| 163 | |
| 164 if(index == 0) | |
| 165 { | |
| 166 index = PRESSURE_SURFACE_QUE - 1; | |
| 167 } | |
| 168 else | |
| 169 { | |
| 170 index = index - 1; | |
| 171 } | |
| 172 do | |
| 173 { | |
| 174 if((EvaluatedValues < EvaluationWindow) && | |
| 175 (fabs(surface_pressure_stable_value - surface_ring_mbar[index]) > PRESSURE_SURFACE_UNSTABLE_LIMIT)) /* unusual change during last 30 minutes */ | |
| 176 { | |
| 177 unstablecnt++; | |
| 178 if(unstablecnt > PRESSURE_SURFACE_DETECT_UNSTABLE_CNT) | |
| 179 { | |
| 180 surface_pressure_stable = 0; | |
| 181 } | |
| 182 } | |
| 183 /* search for a value which does not change for several iterations */ | |
| 184 if (fabs(lastvalue - surface_ring_mbar[index]) < PRESSURE_SURFACE_STABLE_LIMIT) | |
| 185 { | |
| 186 stablecnt++; | |
| 187 } | |
| 188 else | |
| 189 { | |
| 190 stablecnt = 0; | |
| 191 } | |
| 192 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 */ | |
| 193 { | |
| 194 surface_pressure_stable_value = surface_ring_mbar[index]; | |
| 195 unstablecnt = 0; | |
| 196 } | |
| 197 | |
| 198 lastvalue = surface_ring_mbar[index]; | |
| 199 | |
| 200 if(index == 0) | |
| 201 { | |
| 202 index = PRESSURE_SURFACE_QUE - 1; | |
| 203 } | |
| 204 else | |
| 205 { | |
| 206 index = index - 1; | |
| 207 } | |
| 208 EvaluatedValues++; | |
| 209 } while (index != surface_pressure_writeIndex); | |
| 210 } | |
| 38 | 211 void update_surface_pressure(uint8_t call_rhythm_seconds) |
| 212 { | |
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213 if(is_init_pressure_done()) |
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214 { |
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215 runningAvg = (runningAvg * avgCount + ambient_pressure_mbar) / (avgCount +1); |
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216 avgCount++; |
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217 secondCounterSurfaceRing += call_rhythm_seconds; |
| 38 | 218 |
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219 if(secondCounterSurfaceRing >= 60) |
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220 { |
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221 if(runningAvg < PRESSURE_SURFACE_MAX_MBAR) |
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222 { |
| 352 | 223 surface_ring_mbar[surface_pressure_writeIndex] = runningAvg; |
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224 } |
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225 else |
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226 { |
| 352 | 227 surface_ring_mbar[surface_pressure_writeIndex] = PRESSURE_SURFACE_MAX_MBAR; |
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228 } |
| 352 | 229 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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230 |
| 352 | 231 if(surface_pressure_writeIndex == PRESSURE_SURFACE_QUE) |
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232 { |
| 352 | 233 surface_pressure_writeIndex = 0; |
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234 } |
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235 |
| 352 | 236 surface_pressure_mbar = surface_ring_mbar[surface_pressure_writeIndex]; /* 30 minutes old measurement */ |
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237 |
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238 secondCounterSurfaceRing = 0; |
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239 avgCount = 1; /* use the current value as starting point but restart the weight decrement of the measurements */ |
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240 |
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241 evaluate_surface_pressure(); |
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242 } |
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243 } |
| 38 | 244 } |
| 245 | |
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246 #ifdef DEMOMODE |
| 38 | 247 float demo_modify_temperature_helper(float bottom_mbar_diff_to_surface) |
| 248 { | |
| 249 const float temperature_surface = 31.0; | |
| 250 const float temperature_bottom = 14.0; | |
| 251 | |
| 252 const float temperature_difference = temperature_bottom - temperature_surface; | |
| 253 | |
| 254 // range 0.0 - 1.0 | |
| 255 float position_now = (ambient_pressure_mbar - surface_pressure_mbar) / bottom_mbar_diff_to_surface; | |
| 256 | |
| 257 if(position_now <= 0) | |
| 258 return temperature_surface; | |
| 259 | |
| 260 if(position_now >= 1) | |
| 261 return temperature_bottom; | |
| 262 | |
| 263 return temperature_surface + (temperature_difference * position_now); | |
| 264 } | |
| 265 | |
| 266 | |
| 267 uint32_t demo_modify_temperature_and_pressure(int32_t divetime_in_seconds, uint8_t subseconds, float ceiling_mbar) | |
| 268 { | |
| 269 | |
| 270 const float descent_rate = 4000/60; | |
| 271 const float ascent_rate = 1000/60; | |
| 272 const uint32_t seconds_descend = (1 * 60) + 30; | |
| 273 const uint32_t turbo_seconds_at_bottom_start = (0 * 60) + 0; | |
| 274 const uint32_t seconds_descend_and_bottomtime = seconds_descend + turbo_seconds_at_bottom_start + (2 * 60) + 0; | |
| 275 uint32_t time_elapsed_in_seconds; | |
| 276 static float ambient_pressure_mbar_memory = 0; | |
| 277 static uint32_t time_last_call = 0; | |
| 278 | |
| 279 if(divetime_in_seconds <= seconds_descend) | |
| 280 { | |
| 281 ambient_pressure_mbar = (divetime_in_seconds * descent_rate) + ((float)(subseconds) * descent_rate) + surface_pressure_mbar; | |
| 282 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 283 | |
| 284 time_last_call = divetime_in_seconds; | |
| 285 return 0; | |
| 286 } | |
| 287 else | |
| 288 if(divetime_in_seconds <= seconds_descend + turbo_seconds_at_bottom_start) | |
| 289 { | |
| 290 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar; | |
| 291 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 292 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 293 time_last_call = divetime_in_seconds; | |
| 294 return turbo_seconds_at_bottom_start; | |
| 295 } | |
| 296 else | |
| 297 if(divetime_in_seconds <= seconds_descend_and_bottomtime) | |
| 298 { | |
| 299 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar; | |
| 300 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 301 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 302 time_last_call = divetime_in_seconds; | |
| 303 return 0; | |
| 304 } | |
| 305 else | |
| 306 { | |
| 307 time_elapsed_in_seconds = divetime_in_seconds - time_last_call; | |
| 308 ambient_pressure_mbar = ambient_pressure_mbar_memory - time_elapsed_in_seconds * ascent_rate; | |
| 309 | |
| 310 if(ambient_pressure_mbar < surface_pressure_mbar) | |
| 311 ambient_pressure_mbar = surface_pressure_mbar; | |
| 312 else if(ambient_pressure_mbar < ceiling_mbar) | |
| 313 ambient_pressure_mbar = ceiling_mbar; | |
| 314 | |
| 315 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 316 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 317 time_last_call = divetime_in_seconds; | |
| 318 return 0; | |
| 319 } | |
| 320 } | |
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321 #endif |
| 38 | 322 |
| 323 uint8_t is_init_pressure_done(void) | |
| 324 { | |
| 325 return pressureSensorInitSuccess; | |
| 326 } | |
| 327 | |
| 328 uint8_t init_pressure(void) | |
| 329 { | |
| 330 uint8_t buffer[1]; | |
| 356 | 331 buffer[0] = 0x1E; // Reset Command |
| 38 | 332 uint8_t retValue = 0xFF; |
| 333 | |
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334 pressureSensorInitSuccess = false; |
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335 |
| 356 | 336 /* Probe new sensor first */ |
| 337 retValue = I2C_Master_Transmit( DEVICE_PRESSURE_MS5837, buffer, 1); | |
| 338 if(retValue != HAL_OK) | |
| 339 { | |
| 340 PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5803; // use old sensor | |
| 341 HAL_Delay(100); | |
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342 I2C_DeInit(); |
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343 HAL_Delay(100); |
| 356 | 344 MX_I2C1_Init(); |
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345 HAL_Delay(100); |
| 356 | 346 } |
| 347 else | |
| 348 { | |
| 349 PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5837; // Success, use new sensor | |
| 350 } | |
| 351 HAL_Delay(3); //2.8ms according to datasheet | |
| 352 | |
| 353 buffer[0] = 0x1E; // Reset Command | |
| 354 retValue = 0xFF; | |
| 355 | |
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356 /* Send reset request to pressure sensor */ |
| 356 | 357 retValue = I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1); |
| 38 | 358 if(retValue != HAL_OK) |
| 359 { | |
| 360 return (HAL_StatusTypeDef)retValue; | |
| 361 } | |
| 356 | 362 HAL_Delay(3); //2.8ms according to datasheet |
| 38 | 363 |
| 356 | 364 for(uint8_t i=0;i<7;i++) |
| 38 | 365 { |
| 366 C[i] = get_ci_by_coef_num(i); | |
| 367 } | |
| 356 | 368 // n_crc = crc4(C); // no evaluation at the moment hw 151026 |
| 38 | 369 |
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370 if(global.I2C_SystemStatus == HAL_OK) |
| 38 | 371 { |
| 372 pressureSensorInitSuccess = 1; | |
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373 retValue = pressure_update(); |
| 38 | 374 } |
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375 return retValue; |
| 38 | 376 } |
| 377 | |
| 378 | |
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379 static uint32_t get_adc(void) |
| 38 | 380 { |
| 381 uint8_t buffer[1]; | |
| 382 uint8_t resivebuf[4]; | |
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383 uint32_t answer = 0xFFFFFFFF; |
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384 |
| 38 | 385 buffer[0] = 0x00; // Get ADC |
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386 if(I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1) == HAL_OK) |
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387 { |
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388 if(I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 4) == HAL_OK) |
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389 { |
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390 resivebuf[3] = 0; |
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391 answer = 256*256 *(uint32_t)resivebuf[0] + 256 * (uint32_t)resivebuf[1] + (uint32_t)resivebuf[2]; |
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392 } |
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393 } |
| 38 | 394 return answer; |
| 395 } | |
| 396 | |
| 397 | |
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398 static uint16_t get_ci_by_coef_num(uint8_t coef_num) |
| 38 | 399 { |
| 400 uint8_t resivebuf[2]; | |
| 401 | |
| 402 uint8_t cmd = CMD_PROM_RD+coef_num*2; | |
| 356 | 403 I2C_Master_Transmit( PRESSURE_ADDRESS, &cmd, 1); |
| 404 I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 2); | |
| 38 | 405 return (256*(uint16_t)resivebuf[0]) + (uint16_t)resivebuf[1]; |
| 406 } | |
| 407 | |
| 408 | |
| 409 | |
| 410 uint8_t pressure_update(void) | |
| 411 { | |
| 412 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; | |
| 413 | |
| 414 statusReturn = pressure_sensor_get_data(); | |
| 415 pressure_calculation(); | |
| 416 return (uint8_t)statusReturn; | |
| 417 } | |
| 418 | |
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419 /* Switch between pressure and temperature measurement with every successful read operation */ |
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420 void pressure_update_alternating(void) |
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421 { |
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422 static uint8_t getTemperature= 0; |
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423 |
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424 if(getTemperature) |
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425 { |
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426 if(pressure_sensor_get_temperature_raw() == HAL_OK) |
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427 { |
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428 getTemperature = 0; |
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429 } |
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430 } |
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431 else |
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432 { |
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433 if(pressure_sensor_get_pressure_raw() == HAL_OK) |
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434 { |
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435 getTemperature = 1; |
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436 } |
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437 } |
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438 pressure_calculation(); |
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439 return; |
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440 } |
| 38 | 441 |
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442 static uint32_t pressure_sensor_get_one_value(uint8_t cmd, HAL_StatusTypeDef *statusReturn) |
| 38 | 443 { |
| 444 uint8_t command = CMD_ADC_CONV + cmd; | |
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445 uint32_t adcValue = 0; |
| 38 | 446 HAL_StatusTypeDef statusReturnTemp = HAL_TIMEOUT; |
| 447 | |
| 356 | 448 statusReturnTemp = I2C_Master_Transmit( PRESSURE_ADDRESS, &command, 1); |
| 38 | 449 |
| 450 if(statusReturn) | |
| 451 { | |
| 452 *statusReturn = statusReturnTemp; | |
| 453 } | |
| 479 | 454 |
| 455 switch (cmd & 0x0f) // wait necessary conversion time | |
| 38 | 456 { |
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457 case CMD_ADC_256 : HAL_Delay(2); break; |
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458 case CMD_ADC_512 : HAL_Delay(4); break; |
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459 case CMD_ADC_1024: HAL_Delay(5); break; |
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460 case CMD_ADC_2048: HAL_Delay(7); break; |
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461 case CMD_ADC_4096: HAL_Delay(11); break; |
| 479 | 462 default: |
| 463 break; | |
| 464 } | |
| 465 adcValue = get_adc(); | |
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466 /* if(adcValue == 0xFFFFFFFF) |
| 479 | 467 { |
| 468 if(statusReturn) | |
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469 { |
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470 *statusReturn = HAL_ERROR; |
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471 } |
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472 }*/ |
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473 |
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474 return adcValue; |
| 38 | 475 } |
| 476 | |
| 477 | |
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478 static HAL_StatusTypeDef pressure_sensor_get_data(void) |
| 38 | 479 { |
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480 uint32_t requestedValue = 0; |
| 38 | 481 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT; |
| 482 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT; | |
| 483 | |
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484 |
| 38 | 485 |
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486 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_4096, &statusReturn2); |
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487 if (statusReturn2 == HAL_OK) |
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488 { |
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489 D2 = requestedValue; |
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490 } |
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491 |
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492 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_4096, &statusReturn1); |
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493 if (statusReturn1 == HAL_OK) |
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494 { |
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495 D1 = requestedValue; |
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496 } |
| 38 | 497 if(statusReturn2 > statusReturn1) // if anything is not HAL_OK (0x00) or worse |
| 498 return statusReturn2; | |
| 499 else | |
| 500 return statusReturn1; | |
| 501 } | |
| 502 | |
| 503 | |
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504 HAL_StatusTypeDef pressure_sensor_get_pressure_raw(void) |
| 38 | 505 { |
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506 uint32_t requestedValue = 0; |
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507 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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508 |
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509 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_4096, &statusReturn); |
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510 if (statusReturn == HAL_OK) |
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511 { |
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512 D1 = requestedValue; |
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513 } |
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514 |
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515 return statusReturn; |
| 38 | 516 } |
| 517 | |
| 518 | |
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519 HAL_StatusTypeDef pressure_sensor_get_temperature_raw(void) |
| 38 | 520 { |
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521 uint32_t requestedValue = 0; |
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522 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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523 |
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524 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_4096, &statusReturn); |
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525 if (statusReturn == HAL_OK) |
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526 { |
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527 D2 = requestedValue; |
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528 } |
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529 return statusReturn; |
| 38 | 530 } |
| 531 | |
| 532 | |
| 352 | 533 #ifdef SIMULATE_PRESSURE |
| 534 void pressure_simulation() | |
| 535 { | |
| 536 static uint32_t tickstart = 0; | |
| 537 static float pressure_sim_mbar = 0; | |
| 538 static uint32_t passedSecond = 0; | |
| 539 static uint32_t secondtick = 0; | |
| 540 | |
| 541 uint32_t lasttick = 0; | |
| 542 | |
| 543 | |
| 544 | |
| 545 if( tickstart == 0) | |
| 546 { | |
| 547 tickstart = HAL_GetTick(); /* init time stamp */ | |
| 548 secondtick = tickstart; | |
| 549 pressure_sim_mbar = 1000; | |
| 550 } | |
| 551 | |
| 552 lasttick = HAL_GetTick(); | |
| 553 if(time_elapsed_ms(secondtick,lasttick) > 1000) /* one second passed since last tick */ | |
| 554 { | |
| 555 secondtick = lasttick; | |
| 556 passedSecond++; | |
| 557 | |
| 558 #ifdef DIVE_AFTER_LANDING | |
| 559 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */ | |
| 560 else if(passedSecond < 300) pressure_sim_mbar -= 1.0; /* decrease pressure in 5 minutes target 770mbar => delta 330 */ | |
| 561 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay stable 10 minutes*/ | |
| 562 else if(passedSecond < 1500) pressure_sim_mbar += 0.5; /* return to 1 bar in 10 Minutes*/ | |
| 563 else if(passedSecond < 1800) pressure_sim_mbar += 0.0; /* 5 minutes break */ | |
| 564 else if(passedSecond < 2000) pressure_sim_mbar += 10.0; /* start dive */ | |
| 565 else if(passedSecond < 2300) pressure_sim_mbar += 0.0; /* stay on depth */ | |
| 566 else if(passedSecond < 2500) pressure_sim_mbar -= 10.0; /* return to surface */ | |
| 567 else pressure_sim_mbar = 1000.0; /* final state */ | |
| 568 #else /* short dive */ | |
| 569 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */ | |
| 570 else if(passedSecond < 180) pressure_sim_mbar += 10.0; /* Start dive */ | |
| 571 else if(passedSecond < 300) pressure_sim_mbar += 0.0; /*stay on depth*/ | |
| 572 else if(passedSecond < 460) pressure_sim_mbar -= 10.0; /* return to surface */ | |
| 573 else if(passedSecond < 600) pressure_sim_mbar += 0.0; /* stay */ | |
| 574 else if(passedSecond < 610) pressure_sim_mbar = 1000.0; /* get ready for second dive */ | |
| 575 else if(passedSecond < 780) pressure_sim_mbar += 10.0; /* Start dive */ | |
| 576 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay on depth*/ | |
| 577 else if(passedSecond < 1060) pressure_sim_mbar -= 10.0; /* return to surface */ | |
| 578 else if(passedSecond < 1200) pressure_sim_mbar += 0.0; /* stay */ | |
| 579 else pressure_sim_mbar = 1000.0; /* final state */ | |
| 580 #endif | |
| 581 } | |
| 582 | |
| 583 | |
| 584 ambient_pressure_mbar = pressure_sim_mbar; | |
| 585 ambient_temperature = 25.0; | |
| 586 return; | |
| 587 } | |
| 588 | |
| 589 #endif | |
| 590 | |
| 38 | 591 void pressure_calculation(void) |
| 592 { | |
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593 if(global.I2C_SystemStatus != HAL_OK) |
| 38 | 594 return; |
| 352 | 595 |
| 596 #ifdef SIMULATE_PRESSURE | |
| 597 pressure_simulation(); | |
| 598 #else | |
| 38 | 599 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(); |
| 352 | 600 #endif |
| 38 | 601 } |
| 602 | |
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603 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void) |
| 38 | 604 { |
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605 static float runningAvg = 0; |
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606 static uint8_t avgCnt = 0; |
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607 |
| 38 | 608 uint32_t local_D1; // ADC value of the pressure conversion |
| 609 uint32_t local_D2; // ADC value of the temperature conversion | |
| 610 int32_t local_Px10; // compensated pressure value | |
| 611 int32_t local_Tx100; // compensated temperature value | |
| 612 int64_t local_dT; // int32_t, difference between actual and measured temperature | |
| 613 int64_t local_OFF; // offset at actual temperature | |
| 614 int64_t local_SENS; // sensitivity at actual temperature | |
| 615 | |
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616 float calc_pressure; |
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617 |
| 38 | 618 int64_t T2; |
| 619 int64_t OFF2; | |
| 620 int64_t SENS2; | |
| 621 | |
| 622 local_D1 = D1; | |
| 623 local_D2 = D2; | |
| 624 | |
| 625 local_dT = ((int64_t)local_D2) - ((int64_t)C[5]) * 256; //pow(2,8); | |
| 626 local_OFF = ((int64_t)C[2]) * 65536 + local_dT * ((int64_t)C[4]) / 128; // pow(2,16), pow(2,7) | |
| 627 local_SENS = ((int64_t)C[1]) * 32768 + local_dT * ((int64_t)C[3]) / 256; // pow(2,15), pow(2,8) | |
| 628 | |
| 629 local_Tx100 = (int32_t)(2000 + (local_dT * ((int64_t)C[6])) / 8388608);// pow(2,23) | |
| 630 | |
| 631 | |
| 632 if(local_Tx100 < 2000) // low temperature | |
| 633 { | |
| 634 T2 = 3 * local_dT; | |
| 635 T2 *= local_dT; | |
| 636 T2 /= 8589934592; | |
| 637 | |
| 638 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 639 OFF2 *= OFF2; | |
| 640 OFF2 *= 3; | |
| 641 OFF2 /= 2; | |
| 642 | |
| 643 SENS2 = ((int64_t)local_Tx100) - 2000; | |
| 644 SENS2 *= SENS2; | |
| 645 SENS2 *= 5; | |
| 646 SENS2 /= 8; | |
| 647 | |
| 648 local_Tx100 -= (int32_t)T2; | |
| 649 local_OFF -= OFF2; | |
| 650 local_SENS -= SENS2; | |
| 651 } | |
| 652 else | |
| 653 { | |
| 654 T2 = 7 * local_dT; | |
| 655 T2 *= local_dT; | |
| 656 T2 /= 137438953472; | |
| 657 | |
| 658 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 659 OFF2 *= OFF2; | |
| 660 OFF2 /= 16; | |
| 661 | |
| 662 local_Tx100 -= (int32_t)T2; | |
| 663 local_OFF -= OFF2; | |
| 664 } | |
| 665 | |
| 666 local_Px10 = (int32_t)( | |
| 667 (((int64_t)((local_D1 * local_SENS) / 2097152)) - local_OFF) | |
| 668 / 8192 );// )) / 10; // pow(2,21), pow(2,13) | |
| 669 | |
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670 ambient_temperature = ((float)local_Tx100) / 100; |
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671 ambient_temperature += temperature_offset; |
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672 |
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673 if(ambient_temperature < TEMPERATURE_MINIMUM) |
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674 { |
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675 ambient_temperature = 20.0; |
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676 } |
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677 |
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678 calc_pressure = ((float)local_Px10) / 10; |
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679 calc_pressure += pressure_offset; |
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680 |
| 480 | 681 runningAvg = (avgCnt * runningAvg + calc_pressure) / (avgCnt + 1); |
| 682 if (avgCnt < 10) /* build an average considering the last measurements to have a weight "1 of 10" */ | |
| 683 { /* Main reason for this is the jitter of up to +-10 HPa in surface mode which is caused */ | |
| 684 avgCnt++; /* by the measurement range of the sensor which is focused on under water pressure measurement */ | |
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685 } |
| 480 | 686 ambient_pressure_mbar = runningAvg; |
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687 |
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688 if(ambient_pressure_mbar < PRESSURE_MINIMUM) |
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689 { |
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690 ambient_pressure_mbar = 1000.0 + pressure_offset; |
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691 } |
| 38 | 692 } |
| 693 | |
| 694 | |
| 695 /* taken from AN520 by meas-spec.com dated 9. Aug. 2011 | |
| 696 * short and int are both 16bit according to AVR/GCC google results | |
| 697 */ | |
| 356 | 698 /*static uint8_t crc4(uint16_t n_prom[]) |
| 38 | 699 { |
| 700 uint16_t cnt; // simple counter | |
| 701 uint16_t n_rem; // crc reminder | |
| 702 uint16_t crc_read; // original value of the crc | |
| 703 uint8_t n_bit; | |
| 704 n_rem = 0x00; | |
| 705 crc_read=n_prom[7]; //save read CRC | |
| 706 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0 | |
| 707 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes | |
| 708 { // choose LSB or MSB | |
| 709 if (cnt%2==1) n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF); | |
| 710 else n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8); | |
| 711 for (n_bit = 8; n_bit > 0; n_bit--) | |
| 712 { | |
| 713 if (n_rem & (0x8000)) | |
| 714 { | |
| 715 n_rem = (n_rem << 1) ^ 0x3000; | |
| 716 } | |
| 717 else | |
| 718 { | |
| 719 n_rem = (n_rem << 1); | |
| 720 } | |
| 721 } | |
| 722 } | |
| 723 n_rem= (0x000F & (n_rem >> 12)); // // final 4-bit reminder is CRC code | |
| 724 n_prom[7]=crc_read; // restore the crc_read to its original place | |
| 725 return (n_rem ^ 0x00); | |
| 726 } | |
| 356 | 727 |
| 38 | 728 void test_calculation(void) |
| 729 { | |
| 730 C1 = 29112; | |
| 731 C2 = 26814; | |
| 732 C3 = 19125; | |
| 733 C4 = 17865; | |
| 734 C5 = 32057; | |
| 735 C6 = 31305; | |
| 736 | |
| 737 C2_x_2p16 = C2 * 65536; | |
| 738 C1_x_2p15 = C1 * 32768; | |
| 739 | |
| 740 D1 = 4944364; | |
| 741 D2 = 8198974; | |
| 742 pressure_calculation() ; | |
| 743 }; | |
| 744 */ | |
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745 void pressure_set_offset (float pressureOffset, float temperatureOffset) |
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746 { |
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747 if(pressure_offset != pressureOffset) /* we received a new value => reinit surface que */ |
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748 { |
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749 ambient_pressure_mbar -= pressure_offset; /* revert old value */ |
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750 ambient_pressure_mbar += pressureOffset; /* apply new offset */ |
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751 init_surface_ring(1); |
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752 } |
| 38 | 753 |
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754 pressure_offset = pressureOffset; |
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755 temperature_offset = temperatureOffset; |
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756 } |
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757 |
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758 |