Mercurial > public > ostc4
annotate Small_CPU/Src/pressure.c @ 334:143fe85f82a2 v1.5.0 release
building a 1.5
| author | heinrichsweikamp |
|---|---|
| date | Sun, 04 Aug 2019 11:01:06 +0200 |
| parents | b4c578caaafb |
| children | c11ce8c885d3 |
| 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 | |
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49 #define PRESSURE_HISTORY_SIZE (8u) |
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50 #define PRESSURE_JUMP_VALID_MBAR (500.0f) /* values are measure several times a second => jumps > 5m very unlikely */ |
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51 |
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52 static uint16_t get_ci_by_coef_num(uint8_t coef_num); |
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53 //void pressure_calculation_new(void); |
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54 //void pressure_calculation_old(void); |
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55 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void); |
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56 static uint8_t crc4(uint16_t n_prom[]); |
| 38 | 57 |
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58 static HAL_StatusTypeDef pressure_sensor_get_data(void); |
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59 static uint32_t get_adc(void); |
| 38 | 60 uint8_t pressureSensorInitSuccess = 0; |
| 61 | |
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62 static uint16_t C[8] = { 1 }; |
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63 static uint32_t D1 = 1; |
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64 static uint32_t D2 = 1; |
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65 static uint8_t n_crc; |
| 38 | 66 |
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67 static int64_t C5_x_2p8 = 1; |
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68 static int64_t C2_x_2p16 = 1; |
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69 static int64_t C1_x_2p15 = 1; |
| 38 | 70 |
| 71 /* | |
| 72 short C2plus10000 = -1; | |
| 73 short C3plus200 = -1; | |
| 74 short C4minus250 = -1; | |
| 75 short UT1 = -1; | |
| 76 short C6plus100 = -1; | |
| 77 */ | |
| 78 | |
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79 static float ambient_temperature = 0; |
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80 static float ambient_pressure_mbar = 1000.0; |
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81 static float surface_pressure_mbar = 1000.0; |
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82 static float surface_ring_mbar[31] = { 0 }; |
| 38 | 83 |
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84 static float pressure_history_mbar[PRESSURE_HISTORY_SIZE]; |
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85 |
| 38 | 86 uint8_t secondCounterSurfaceRing = 0; |
| 87 | |
| 88 float get_temperature(void) | |
| 89 { | |
| 90 return ambient_temperature; | |
| 91 } | |
| 92 | |
| 93 float get_pressure_mbar(void) | |
| 94 { | |
| 95 return ambient_pressure_mbar; | |
| 96 } | |
| 97 | |
| 98 float get_surface_mbar(void) | |
| 99 { | |
| 100 return surface_pressure_mbar; | |
| 101 } | |
| 102 | |
| 103 | |
| 104 void init_surface_ring(void) | |
| 105 { | |
| 106 surface_ring_mbar[0] = 0; | |
| 107 for(int i=1; i<31; i++) | |
| 108 surface_ring_mbar[i] = ambient_pressure_mbar; | |
| 109 surface_pressure_mbar = ambient_pressure_mbar; | |
| 110 } | |
| 111 | |
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112 void init_pressure_history(void) |
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113 { |
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114 for(int i=0; i<PRESSURE_HISTORY_SIZE; i++) |
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115 { |
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116 pressure_history_mbar[i] = 1000.0; |
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117 } |
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118 } |
| 38 | 119 |
| 120 /* the ring has one place with 0 | |
| 121 * after that comes the oldest value | |
| 122 * the new pressure is written in this hole | |
| 123 * the oldest value is read and then the new hole | |
| 124 */ | |
| 125 void update_surface_pressure(uint8_t call_rhythm_seconds) | |
| 126 { | |
| 127 secondCounterSurfaceRing += call_rhythm_seconds; | |
| 128 | |
| 129 if(secondCounterSurfaceRing < 60) | |
| 130 return; | |
| 131 | |
| 132 secondCounterSurfaceRing = 0; | |
| 133 | |
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134 if(is_init_pressure_done()) |
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135 { |
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136 int hole; |
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137 for(hole=30;hole>0;hole--) |
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138 if(surface_ring_mbar[hole] == 0) { break; } |
| 38 | 139 |
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140 surface_ring_mbar[hole] = ambient_pressure_mbar; |
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141 |
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142 hole++; |
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143 if(hole > 30) |
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144 hole = 0; |
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145 surface_pressure_mbar = surface_ring_mbar[hole]; |
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146 surface_ring_mbar[hole] = 0; |
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147 } |
| 38 | 148 } |
| 149 | |
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150 #ifdef DEMOMODE |
| 38 | 151 float demo_modify_temperature_helper(float bottom_mbar_diff_to_surface) |
| 152 { | |
| 153 const float temperature_surface = 31.0; | |
| 154 const float temperature_bottom = 14.0; | |
| 155 | |
| 156 const float temperature_difference = temperature_bottom - temperature_surface; | |
| 157 | |
| 158 // range 0.0 - 1.0 | |
| 159 float position_now = (ambient_pressure_mbar - surface_pressure_mbar) / bottom_mbar_diff_to_surface; | |
| 160 | |
| 161 if(position_now <= 0) | |
| 162 return temperature_surface; | |
| 163 | |
| 164 if(position_now >= 1) | |
| 165 return temperature_bottom; | |
| 166 | |
| 167 return temperature_surface + (temperature_difference * position_now); | |
| 168 } | |
| 169 | |
| 170 | |
| 171 uint32_t demo_modify_temperature_and_pressure(int32_t divetime_in_seconds, uint8_t subseconds, float ceiling_mbar) | |
| 172 { | |
| 173 | |
| 174 const float descent_rate = 4000/60; | |
| 175 const float ascent_rate = 1000/60; | |
| 176 const uint32_t seconds_descend = (1 * 60) + 30; | |
| 177 const uint32_t turbo_seconds_at_bottom_start = (0 * 60) + 0; | |
| 178 const uint32_t seconds_descend_and_bottomtime = seconds_descend + turbo_seconds_at_bottom_start + (2 * 60) + 0; | |
| 179 uint32_t time_elapsed_in_seconds; | |
| 180 static float ambient_pressure_mbar_memory = 0; | |
| 181 static uint32_t time_last_call = 0; | |
| 182 | |
| 183 if(divetime_in_seconds <= seconds_descend) | |
| 184 { | |
| 185 ambient_pressure_mbar = (divetime_in_seconds * descent_rate) + ((float)(subseconds) * descent_rate) + surface_pressure_mbar; | |
| 186 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 187 | |
| 188 time_last_call = divetime_in_seconds; | |
| 189 return 0; | |
| 190 } | |
| 191 else | |
| 192 if(divetime_in_seconds <= seconds_descend + turbo_seconds_at_bottom_start) | |
| 193 { | |
| 194 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar; | |
| 195 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 196 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 197 time_last_call = divetime_in_seconds; | |
| 198 return turbo_seconds_at_bottom_start; | |
| 199 } | |
| 200 else | |
| 201 if(divetime_in_seconds <= seconds_descend_and_bottomtime) | |
| 202 { | |
| 203 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar; | |
| 204 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 205 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 206 time_last_call = divetime_in_seconds; | |
| 207 return 0; | |
| 208 } | |
| 209 else | |
| 210 { | |
| 211 time_elapsed_in_seconds = divetime_in_seconds - time_last_call; | |
| 212 ambient_pressure_mbar = ambient_pressure_mbar_memory - time_elapsed_in_seconds * ascent_rate; | |
| 213 | |
| 214 if(ambient_pressure_mbar < surface_pressure_mbar) | |
| 215 ambient_pressure_mbar = surface_pressure_mbar; | |
| 216 else if(ambient_pressure_mbar < ceiling_mbar) | |
| 217 ambient_pressure_mbar = ceiling_mbar; | |
| 218 | |
| 219 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 220 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 221 time_last_call = divetime_in_seconds; | |
| 222 return 0; | |
| 223 } | |
| 224 } | |
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225 #endif |
| 38 | 226 |
| 227 uint8_t is_init_pressure_done(void) | |
| 228 { | |
| 229 return pressureSensorInitSuccess; | |
| 230 } | |
| 231 | |
| 232 uint8_t init_pressure(void) | |
| 233 { | |
| 234 uint8_t buffer[1]; | |
| 235 buffer[0] = 0x1e; | |
| 236 uint8_t retValue = 0xFF; | |
| 237 | |
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238 pressureSensorInitSuccess = false; |
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239 init_pressure_history(); |
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240 |
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241 /* Send reset request to pressure sensor */ |
| 38 | 242 retValue = I2C_Master_Transmit( DEVICE_PRESSURE, buffer, 1); |
| 243 if(retValue != HAL_OK) | |
| 244 { | |
| 245 return (HAL_StatusTypeDef)retValue; | |
| 246 } | |
| 247 HAL_Delay(3); | |
| 248 | |
| 249 for(uint8_t i=0;i<8;i++) | |
| 250 { | |
| 251 C[i] = get_ci_by_coef_num(i); | |
| 252 } | |
| 253 n_crc = crc4(C); // no evaluation at the moment hw 151026 | |
| 254 | |
| 255 C5_x_2p8 = C[5] * 256; | |
| 256 C2_x_2p16 = C[2] * 65536; | |
| 257 C1_x_2p15 = C[1] * 32768; | |
| 258 | |
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259 if(global.I2C_SystemStatus == HAL_OK) |
| 38 | 260 { |
| 261 pressureSensorInitSuccess = 1; | |
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262 retValue = pressure_update(); |
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263 |
| 38 | 264 } |
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265 return retValue; |
| 38 | 266 } |
| 267 | |
| 268 | |
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269 static uint32_t get_adc(void) |
| 38 | 270 { |
| 271 uint8_t buffer[1]; | |
| 272 uint8_t resivebuf[4]; | |
| 273 uint32_t answer = 0; | |
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274 |
| 38 | 275 buffer[0] = 0x00; // Get ADC |
| 276 I2C_Master_Transmit( DEVICE_PRESSURE, buffer, 1); | |
| 277 I2C_Master_Receive( DEVICE_PRESSURE, resivebuf, 4); | |
| 278 resivebuf[3] = 0; | |
| 279 answer = 256*256 *(uint32_t)resivebuf[0] + 256 * (uint32_t)resivebuf[1] + (uint32_t)resivebuf[2]; | |
| 280 | |
| 281 return answer; | |
| 282 } | |
| 283 | |
| 284 | |
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285 static uint16_t get_ci_by_coef_num(uint8_t coef_num) |
| 38 | 286 { |
| 287 uint8_t resivebuf[2]; | |
| 288 | |
| 289 uint8_t cmd = CMD_PROM_RD+coef_num*2; | |
| 290 I2C_Master_Transmit( DEVICE_PRESSURE, &cmd, 1); | |
| 291 I2C_Master_Receive( DEVICE_PRESSURE, resivebuf, 2); | |
| 292 return (256*(uint16_t)resivebuf[0]) + (uint16_t)resivebuf[1]; | |
| 293 } | |
| 294 | |
| 295 | |
| 296 | |
| 297 uint8_t pressure_update(void) | |
| 298 { | |
| 299 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; | |
| 300 | |
| 301 statusReturn = pressure_sensor_get_data(); | |
| 302 pressure_calculation(); | |
| 303 return (uint8_t)statusReturn; | |
| 304 } | |
| 305 | |
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306 /* Switch between pressure and temperature measurement with every successful read operation */ |
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307 void pressure_update_alternating(void) |
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308 { |
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309 static uint8_t getTemperature= 0; |
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310 |
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311 if(getTemperature) |
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312 { |
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313 if(pressure_sensor_get_temperature_raw() == HAL_OK) |
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314 { |
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315 getTemperature = 0; |
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316 } |
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317 } |
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318 else |
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319 { |
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320 if(pressure_sensor_get_pressure_raw() == HAL_OK) |
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321 { |
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322 getTemperature = 1; |
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323 } |
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324 } |
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325 pressure_calculation(); |
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326 return; |
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327 } |
| 38 | 328 |
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329 static uint32_t pressure_sensor_get_one_value(uint8_t cmd, HAL_StatusTypeDef *statusReturn) |
| 38 | 330 { |
| 331 uint8_t command = CMD_ADC_CONV + cmd; | |
| 332 HAL_StatusTypeDef statusReturnTemp = HAL_TIMEOUT; | |
| 333 | |
| 334 statusReturnTemp = I2C_Master_Transmit( DEVICE_PRESSURE, &command, 1); | |
| 335 | |
| 336 if(statusReturn) | |
| 337 { | |
| 338 *statusReturn = statusReturnTemp; | |
| 339 } | |
| 340 | |
| 341 switch (cmd & 0x0f) // wait necessary conversion time | |
| 342 { | |
| 343 case CMD_ADC_256 : HAL_Delay(1); break; | |
| 344 case CMD_ADC_512 : HAL_Delay(3); break; | |
| 345 case CMD_ADC_1024: HAL_Delay(4); break; | |
| 346 case CMD_ADC_2048: HAL_Delay(6); break; | |
| 347 case CMD_ADC_4096: HAL_Delay(10); break; | |
| 348 } | |
| 349 return get_adc(); | |
| 350 } | |
| 351 | |
| 352 | |
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353 static HAL_StatusTypeDef pressure_sensor_get_data(void) |
| 38 | 354 { |
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355 uint32_t requestedValue = 0; |
| 38 | 356 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT; |
| 357 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT; | |
| 358 | |
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359 |
| 38 | 360 |
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361 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn2); |
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362 if (statusReturn2 == HAL_OK) |
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363 { |
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364 D2 = requestedValue; |
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365 } |
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366 |
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367 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn1); |
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368 if (statusReturn1 == HAL_OK) |
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369 { |
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370 D1 = requestedValue; |
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371 } |
| 38 | 372 if(statusReturn2 > statusReturn1) // if anything is not HAL_OK (0x00) or worse |
| 373 return statusReturn2; | |
| 374 else | |
| 375 return statusReturn1; | |
| 376 } | |
| 377 | |
| 378 | |
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379 HAL_StatusTypeDef pressure_sensor_get_pressure_raw(void) |
| 38 | 380 { |
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381 uint32_t requestedValue = 0; |
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382 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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383 |
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384 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn); |
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385 if (statusReturn == HAL_OK) |
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386 { |
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387 D1 = requestedValue; |
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388 } |
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389 |
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390 return statusReturn; |
| 38 | 391 } |
| 392 | |
| 393 | |
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394 HAL_StatusTypeDef pressure_sensor_get_temperature_raw(void) |
| 38 | 395 { |
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396 uint32_t requestedValue = 0; |
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397 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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398 |
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399 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn); |
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400 if (statusReturn == HAL_OK) |
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401 { |
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402 D2 = requestedValue; |
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403 } |
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404 return statusReturn; |
| 38 | 405 } |
| 406 | |
| 407 | |
| 408 void pressure_calculation(void) | |
| 409 { | |
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410 if(global.I2C_SystemStatus != HAL_OK) |
| 38 | 411 return; |
| 412 | |
| 413 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(); | |
| 414 } | |
| 415 | |
|
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416 static uint8_t pressure_plausible(float pressurevalue) |
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417 { |
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418 static uint8_t pressurewriteindex = 0; |
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419 uint8_t retval = 0; |
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420 uint8_t index; |
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421 float pressure_average = 0; |
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422 |
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423 for(index = 0; index < PRESSURE_HISTORY_SIZE; index++) |
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424 { |
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425 pressure_average += pressure_history_mbar[index]; |
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426 } |
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427 pressure_average /= PRESSURE_HISTORY_SIZE; |
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428 if(pressure_average == 1000.0) /* first pressure calculation */ |
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429 { |
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430 if(fabs(pressurevalue - pressure_average) < 11000.0) /* just in case a reset occure during dive assume value equal < 100m as valid */ |
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431 { |
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432 for(index = 0; index < PRESSURE_HISTORY_SIZE; index++) |
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433 { |
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434 pressure_history_mbar[index] = pressurevalue; /* set history to current value */ |
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435 retval = 1; |
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436 } |
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437 } |
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438 } |
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439 else |
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440 { |
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441 if(fabs(pressurevalue - pressure_average) < PRESSURE_JUMP_VALID_MBAR) |
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442 pressure_history_mbar[pressurewriteindex++] = pressurevalue; |
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443 pressurewriteindex &= 0x7; /* wrap around if necessary */ |
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444 retval = 1; |
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445 } |
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446 |
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447 return retval; |
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448 } |
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449 |
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450 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void) |
| 38 | 451 { |
| 452 uint32_t local_D1; // ADC value of the pressure conversion | |
| 453 uint32_t local_D2; // ADC value of the temperature conversion | |
| 454 int32_t local_Px10; // compensated pressure value | |
| 455 int32_t local_Tx100; // compensated temperature value | |
| 456 int64_t local_dT; // int32_t, difference between actual and measured temperature | |
| 457 int64_t local_OFF; // offset at actual temperature | |
| 458 int64_t local_SENS; // sensitivity at actual temperature | |
| 459 | |
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460 float calc_pressure; |
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461 |
| 38 | 462 int64_t T2; |
| 463 int64_t OFF2; | |
| 464 int64_t SENS2; | |
| 465 | |
| 466 local_D1 = D1; | |
| 467 local_D2 = D2; | |
| 468 | |
| 469 local_dT = ((int64_t)local_D2) - ((int64_t)C[5]) * 256; //pow(2,8); | |
| 470 local_OFF = ((int64_t)C[2]) * 65536 + local_dT * ((int64_t)C[4]) / 128; // pow(2,16), pow(2,7) | |
| 471 local_SENS = ((int64_t)C[1]) * 32768 + local_dT * ((int64_t)C[3]) / 256; // pow(2,15), pow(2,8) | |
| 472 | |
| 473 local_Tx100 = (int32_t)(2000 + (local_dT * ((int64_t)C[6])) / 8388608);// pow(2,23) | |
| 474 | |
| 475 | |
| 476 if(local_Tx100 < 2000) // low temperature | |
| 477 { | |
| 478 T2 = 3 * local_dT; | |
| 479 T2 *= local_dT; | |
| 480 T2 /= 8589934592; | |
| 481 | |
| 482 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 483 OFF2 *= OFF2; | |
| 484 OFF2 *= 3; | |
| 485 OFF2 /= 2; | |
| 486 | |
| 487 SENS2 = ((int64_t)local_Tx100) - 2000; | |
| 488 SENS2 *= SENS2; | |
| 489 SENS2 *= 5; | |
| 490 SENS2 /= 8; | |
| 491 | |
| 492 local_Tx100 -= (int32_t)T2; | |
| 493 local_OFF -= OFF2; | |
| 494 local_SENS -= SENS2; | |
| 495 } | |
| 496 else | |
| 497 { | |
| 498 T2 = 7 * local_dT; | |
| 499 T2 *= local_dT; | |
| 500 T2 /= 137438953472; | |
| 501 | |
| 502 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 503 OFF2 *= OFF2; | |
| 504 OFF2 /= 16; | |
| 505 | |
| 506 local_Tx100 -= (int32_t)T2; | |
| 507 local_OFF -= OFF2; | |
| 508 } | |
| 509 | |
| 510 local_Px10 = (int32_t)( | |
| 511 (((int64_t)((local_D1 * local_SENS) / 2097152)) - local_OFF) | |
| 512 / 8192 );// )) / 10; // pow(2,21), pow(2,13) | |
| 513 | |
| 514 ambient_temperature = ((float)local_Tx100) / 100; | |
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515 |
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516 calc_pressure = ((float)local_Px10) / 10; |
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517 if(pressure_plausible(calc_pressure)) |
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518 { |
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519 ambient_pressure_mbar = calc_pressure; |
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520 } |
| 38 | 521 } |
| 522 | |
| 523 | |
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524 /* |
| 38 | 525 void pressure_calculation_new(void) |
| 526 { | |
| 527 #define POW2_8 (256) | |
| 528 #define POW2_17 (131072) | |
| 529 #define POW2_6 (64) | |
| 530 #define POW2_16 (65536) | |
| 531 #define POW2_7 (128) | |
| 532 #define POW2_23 (8388608) | |
| 533 #define POW2_21 (2097152) | |
| 534 #define POW2_15 (32768) | |
| 535 #define POW2_13 (8192) | |
| 536 #define POW2_37 (137438953472) | |
| 537 #define POW2_4 (16) | |
| 538 #define POW2_33 (8589934592) | |
| 539 #define POW2_3 (8) | |
| 540 | |
| 541 int32_t P; // compensated pressure value | |
| 542 int32_t T; // compensated temperature value | |
| 543 int32_t dT; // difference between actual and measured temperature | |
| 544 int64_t OFF; // offset at actual temperature | |
| 545 int64_t SENS; | |
| 546 | |
| 547 int32_t T2; | |
| 548 int64_t OFF2; | |
| 549 int64_t SENS2; | |
| 550 | |
| 551 dT = ((int32_t)D2) - ((int32_t)C[5]) * POW2_8; | |
| 552 OFF = ((int64_t)C[2]) * POW2_16 + ((int64_t)dT) * ((int64_t)C[4]) / POW2_7; | |
| 553 SENS = ((int64_t)C[1]) * POW2_15 + ((int64_t)dT) * ((int64_t)C[3]) / POW2_8; | |
| 554 | |
| 555 T = 2000 + (dT * ((int32_t)C[6])) / POW2_23; | |
| 556 | |
| 557 | |
| 558 if(T < 2000) // low temperature | |
| 559 { | |
| 560 T2 = 3 * dT * dT; | |
| 561 T2 /= POW2_33; | |
| 562 OFF2 = ((int64_t)T) - 2000; | |
| 563 OFF2 *= OFF2; | |
| 564 OFF2 *= 3; | |
| 565 OFF2 /= 2; | |
| 566 SENS2 = ((int64_t)T) - 2000; | |
| 567 SENS2 *= SENS2; | |
| 568 SENS2 *= 5; | |
| 569 SENS2 /= POW2_3; | |
| 570 } | |
| 571 else // high temperature | |
| 572 { | |
| 573 T2 = 7 * dT * dT; | |
| 574 T2 /= POW2_37; | |
| 575 OFF2 = ((int64_t)T) - 2000; | |
| 576 OFF2 *= OFF2; | |
| 577 OFF2 /= POW2_4; | |
| 578 SENS2 = 0; | |
| 579 } | |
| 580 | |
| 581 T = T - T2; | |
| 582 OFF = OFF - OFF2; | |
| 583 SENS = SENS - SENS2; | |
| 584 | |
| 585 P = (int32_t)(((((int64_t)D1) * SENS) / POW2_21 - OFF) / POW2_13); | |
| 586 | |
| 587 ambient_temperature = ((float)T) / 100; | |
| 588 ambient_pressure_mbar = ((float)P) / 10; | |
| 589 } | |
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590 */ |
| 38 | 591 |
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592 /* |
| 38 | 593 void pressure_calculation_old(void) { |
| 594 // | |
| 595 double ambient_temperature_centigrad = 0; | |
| 596 double ambient_pressure_decimbar = 0; | |
| 597 | |
| 598 // static for debug | |
| 599 static int64_t dt = 0; | |
| 600 static int64_t temp = 0; | |
| 601 static int64_t ms_off = 0; | |
| 602 static int64_t sens = 0; | |
| 603 // | |
| 604 static int64_t ms_off2 = 0; | |
| 605 static int64_t sens2 = 0; | |
| 606 static int64_t t2 = 0; | |
| 607 | |
| 608 if((D2 == 0) || (D1 == 0)) | |
| 609 return; | |
| 610 // | |
| 611 | |
| 612 // dT = D2 - C[5] * POW2_8; | |
| 613 // T = 2000 + (dT * C[6]) / POW2_23; | |
| 614 dt = (int64_t)D2 - C5_x_2p8; | |
| 615 //temp ; // in 10 milliGrad Celcius | |
| 616 ambient_temperature_centigrad = 2000 + dt * C[6] / 8388608; | |
| 617 | |
| 618 | |
| 619 if(ambient_temperature_centigrad < 2000) // low temperature | |
| 620 { | |
| 621 t2 = 3 * dt; | |
| 622 t2 *= dt; | |
| 623 t2 /= 8589934592; | |
| 624 ms_off2 = ambient_temperature_centigrad - 2000; | |
| 625 ms_off2 *= ms_off2; | |
| 626 sens2 = ms_off2; | |
| 627 ms_off2 *= 3; | |
| 628 ms_off2 /= 2; | |
| 629 sens2 *= 5; | |
| 630 sens2 /= 8; | |
| 631 } | |
| 632 else // high temperature | |
| 633 { | |
| 634 t2 = 7 * dt; | |
| 635 t2 *= dt; | |
| 636 t2 /= 137438953472; | |
| 637 ms_off2 = ambient_temperature_centigrad - 2000; | |
| 638 ms_off2 *= ms_off2; | |
| 639 ms_off2 /= 16; | |
| 640 sens2 = 0; | |
| 641 } | |
| 642 | |
| 643 | |
| 644 // | |
| 645 | |
| 646 // pressure | |
| 647 // OFF = C[2] * POW2_16 + dT * C[4] / POW2_7; | |
| 648 // SENS = C[1] * POW2_15 + dT * C[3] / POW2_8; | |
| 649 ms_off = C[4] * dt; | |
| 650 ms_off /= 128; | |
| 651 ms_off += C2_x_2p16; | |
| 652 // | |
| 653 sens = C[3] * dt; | |
| 654 sens /= 256; | |
| 655 sens += C1_x_2p15; | |
| 656 | |
| 657 // 2nd order correction | |
| 658 ambient_temperature_centigrad -= t2; | |
| 659 ms_off -= ms_off2; | |
| 660 sens -= sens2; | |
| 661 | |
| 662 ambient_temperature = ambient_temperature_centigrad / 100; | |
| 663 // P = (D1 * SENS / POW2_21 - OFF) / POW2_13; | |
| 664 temp = D1 * sens; | |
| 665 temp /= 2097152; | |
| 666 temp -= ms_off; | |
| 667 temp /= 8192; | |
| 668 ambient_pressure_decimbar = temp; // to float/double | |
| 669 ambient_pressure_mbar = ambient_pressure_decimbar / 10; | |
| 670 } | |
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671 */ |
| 38 | 672 |
| 673 | |
| 674 /* taken from AN520 by meas-spec.com dated 9. Aug. 2011 | |
| 675 * short and int are both 16bit according to AVR/GCC google results | |
| 676 */ | |
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677 static uint8_t crc4(uint16_t n_prom[]) |
| 38 | 678 { |
| 679 uint16_t cnt; // simple counter | |
| 680 uint16_t n_rem; // crc reminder | |
| 681 uint16_t crc_read; // original value of the crc | |
| 682 uint8_t n_bit; | |
| 683 n_rem = 0x00; | |
| 684 crc_read=n_prom[7]; //save read CRC | |
| 685 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0 | |
| 686 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes | |
| 687 { // choose LSB or MSB | |
| 688 if (cnt%2==1) n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF); | |
| 689 else n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8); | |
| 690 for (n_bit = 8; n_bit > 0; n_bit--) | |
| 691 { | |
| 692 if (n_rem & (0x8000)) | |
| 693 { | |
| 694 n_rem = (n_rem << 1) ^ 0x3000; | |
| 695 } | |
| 696 else | |
| 697 { | |
| 698 n_rem = (n_rem << 1); | |
| 699 } | |
| 700 } | |
| 701 } | |
| 702 n_rem= (0x000F & (n_rem >> 12)); // // final 4-bit reminder is CRC code | |
| 703 n_prom[7]=crc_read; // restore the crc_read to its original place | |
| 704 return (n_rem ^ 0x00); | |
| 705 } | |
| 706 /* | |
| 707 void test_calculation(void) | |
| 708 { | |
| 709 C1 = 29112; | |
| 710 C2 = 26814; | |
| 711 C3 = 19125; | |
| 712 C4 = 17865; | |
| 713 C5 = 32057; | |
| 714 C6 = 31305; | |
| 715 | |
| 716 C2_x_2p16 = C2 * 65536; | |
| 717 C1_x_2p15 = C1 * 32768; | |
| 718 | |
| 719 D1 = 4944364; | |
| 720 D2 = 8198974; | |
| 721 pressure_calculation() ; | |
| 722 }; | |
| 723 */ | |
| 724 |