Mercurial > public > ostc4
annotate Small_CPU/Src/pressure.c @ 758:b6d8a6fbf4fd
- Colours for scrubber display when time remaining falls below a threshold value
- Display negative values when time is up and diving continues;
- count down remaining scrubber time only when the dive computer is not set to bailout - after all, there is not much point in counting down time if the diver is not breathing through the scrubber.
| author | heinrichsweikamp |
|---|---|
| date | Wed, 15 Mar 2023 09:18:07 +0100 |
| parents | 8c92f7743e14 |
| children | 2ace67231c49 |
| 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; |
| 352 | 133 surface_pressure_writeIndex = 0; /* index of the oldest value in the ring buffer */ |
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134 } |
| 38 | 135 } |
| 136 | |
| 352 | 137 uint8_t is_surface_pressure_stable(void) |
| 138 { | |
| 139 return surface_pressure_stable; | |
| 140 } | |
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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 { | |
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212 if(is_init_pressure_done()) |
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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; |
| 38 | 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 */ |
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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(); |
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241 } |
| 38 | 242 } |
| 243 | |
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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 } | |
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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 | |
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332 pressureSensorInitSuccess = false; |
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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); | |
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340 I2C_DeInit(); |
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341 HAL_Delay(100); |
| 356 | 342 MX_I2C1_Init(); |
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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 | |
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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 |
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368 if(global.I2C_SystemStatus == HAL_OK) |
| 38 | 369 { |
| 370 pressureSensorInitSuccess = 1; | |
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371 retValue = pressure_update(); |
| 38 | 372 } |
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373 return retValue; |
| 38 | 374 } |
| 375 | |
| 376 | |
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377 static uint32_t get_adc(void) |
| 38 | 378 { |
| 379 uint8_t buffer[1]; | |
| 380 uint8_t resivebuf[4]; | |
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381 uint32_t answer = 0xFFFFFFFF; |
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382 |
| 38 | 383 buffer[0] = 0x00; // Get ADC |
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384 if(I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1) == HAL_OK) |
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385 { |
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386 if(I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 4) == HAL_OK) |
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387 { |
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388 resivebuf[3] = 0; |
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389 answer = 256*256 *(uint32_t)resivebuf[0] + 256 * (uint32_t)resivebuf[1] + (uint32_t)resivebuf[2]; |
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390 } |
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391 } |
| 38 | 392 return answer; |
| 393 } | |
| 394 | |
| 395 | |
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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 | |
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417 /* Switch between pressure and temperature measurement with every successful read operation */ |
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418 void pressure_update_alternating(void) |
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419 { |
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420 static uint8_t getTemperature= 0; |
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421 |
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422 if(getTemperature) |
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423 { |
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424 if(pressure_sensor_get_temperature_raw() == HAL_OK) |
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425 { |
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426 getTemperature = 0; |
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427 } |
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428 } |
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429 else |
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430 { |
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431 if(pressure_sensor_get_pressure_raw() == HAL_OK) |
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432 { |
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433 getTemperature = 1; |
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434 } |
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435 } |
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436 pressure_calculation(); |
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437 return; |
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438 } |
| 38 | 439 |
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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; | |
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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 { |
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455 case CMD_ADC_256 : HAL_Delay(2); break; |
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456 case CMD_ADC_512 : HAL_Delay(4); break; |
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457 case CMD_ADC_1024: HAL_Delay(5); break; |
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458 case CMD_ADC_2048: HAL_Delay(7); break; |
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459 case CMD_ADC_4096: HAL_Delay(11); break; |
| 479 | 460 default: |
| 461 break; | |
| 462 } | |
| 463 adcValue = get_adc(); | |
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464 /* if(adcValue == 0xFFFFFFFF) |
| 479 | 465 { |
| 466 if(statusReturn) | |
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467 { |
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468 *statusReturn = HAL_ERROR; |
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469 } |
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470 }*/ |
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471 |
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472 return adcValue; |
| 38 | 473 } |
| 474 | |
| 475 | |
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476 static HAL_StatusTypeDef pressure_sensor_get_data(void) |
| 38 | 477 { |
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478 uint32_t requestedValue = 0; |
| 38 | 479 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT; |
| 480 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT; | |
| 481 | |
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482 |
| 38 | 483 |
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484 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_4096, &statusReturn2); |
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485 if (statusReturn2 == HAL_OK) |
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486 { |
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487 D2 = requestedValue; |
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488 } |
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489 |
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490 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_4096, &statusReturn1); |
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491 if (statusReturn1 == HAL_OK) |
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492 { |
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493 D1 = requestedValue; |
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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 | |
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502 HAL_StatusTypeDef pressure_sensor_get_pressure_raw(void) |
| 38 | 503 { |
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504 uint32_t requestedValue = 0; |
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505 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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506 |
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507 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_4096, &statusReturn); |
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508 if (statusReturn == HAL_OK) |
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509 { |
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510 D1 = requestedValue; |
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511 } |
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512 |
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513 return statusReturn; |
| 38 | 514 } |
| 515 | |
| 516 | |
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517 HAL_StatusTypeDef pressure_sensor_get_temperature_raw(void) |
| 38 | 518 { |
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519 uint32_t requestedValue = 0; |
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520 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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521 |
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522 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_4096, &statusReturn); |
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523 if (statusReturn == HAL_OK) |
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524 { |
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525 D2 = requestedValue; |
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526 } |
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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 { | |
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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 | |
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601 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void) |
| 38 | 602 { |
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603 static float runningAvg = 0; |
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604 static uint8_t avgCnt = 0; |
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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 | |
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614 float calc_pressure; |
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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 | |
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668 ambient_temperature = ((float)local_Tx100) / 100; |
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669 ambient_temperature += temperature_offset; |
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670 |
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671 if(ambient_temperature < TEMPERATURE_MINIMUM) |
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672 { |
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673 ambient_temperature = 20.0; |
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674 } |
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675 |
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676 calc_pressure = ((float)local_Px10) / 10; |
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677 calc_pressure += pressure_offset; |
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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 */ | |
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683 } |
| 480 | 684 ambient_pressure_mbar = runningAvg; |
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685 |
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686 if(ambient_pressure_mbar < PRESSURE_MINIMUM) |
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687 { |
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688 ambient_pressure_mbar = 1000.0; |
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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 */ | |
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743 void pressure_set_offset (float pressureOffset, float temperatureOffset) |
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744 { |
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745 if(pressure_offset != pressureOffset) /* we received a new value => reinit surface que */ |
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746 { |
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747 ambient_pressure_mbar -= pressure_offset; /* revert old value */ |
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748 ambient_pressure_mbar += pressureOffset; /* apply new offset */ |
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749 init_surface_ring(1); |
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750 } |
| 38 | 751 |
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752 pressure_offset = pressureOffset; |
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753 temperature_offset = temperatureOffset; |
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754 } |
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755 |
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756 |