Mercurial > public > ostc4
annotate Small_CPU/Src/pressure.c @ 337:38367bb982b8 PressureMeasure_Improvment
Set Max value for pressure offset to 50mBar (20mBar before)
Some OSTC4 might have a higher delta and need a bigger offset
| author | ideenmodellierer |
|---|---|
| date | Sat, 17 Aug 2019 18:47:08 +0200 |
| parents | c11ce8c885d3 |
| children | 37f45300bc2e |
| 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 #define PRESSURE_SURFACE_QUE (30u) /* history buffer [minutes] for past pressure measurements */ |
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53 |
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54 static uint16_t get_ci_by_coef_num(uint8_t coef_num); |
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55 //void pressure_calculation_new(void); |
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56 //void pressure_calculation_old(void); |
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57 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void); |
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58 static uint8_t crc4(uint16_t n_prom[]); |
| 38 | 59 |
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60 static HAL_StatusTypeDef pressure_sensor_get_data(void); |
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61 static uint32_t get_adc(void); |
| 38 | 62 uint8_t pressureSensorInitSuccess = 0; |
| 63 | |
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64 static uint16_t C[8] = { 1 }; |
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65 static uint32_t D1 = 1; |
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66 static uint32_t D2 = 1; |
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67 static uint8_t n_crc; |
| 38 | 68 |
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69 static int64_t C5_x_2p8 = 1; |
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70 static int64_t C2_x_2p16 = 1; |
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71 static int64_t C1_x_2p15 = 1; |
| 38 | 72 |
| 73 /* | |
| 74 short C2plus10000 = -1; | |
| 75 short C3plus200 = -1; | |
| 76 short C4minus250 = -1; | |
| 77 short UT1 = -1; | |
| 78 short C6plus100 = -1; | |
| 79 */ | |
| 80 | |
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81 static float ambient_temperature = 0; |
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82 static float ambient_pressure_mbar = 1000.0; |
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83 static float surface_pressure_mbar = 1000.0; |
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84 static float surface_ring_mbar[PRESSURE_SURFACE_QUE] = { 0 }; |
| 38 | 85 |
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86 static float pressure_history_mbar[PRESSURE_HISTORY_SIZE]; |
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87 |
| 38 | 88 uint8_t secondCounterSurfaceRing = 0; |
| 89 | |
| 90 float get_temperature(void) | |
| 91 { | |
| 92 return ambient_temperature; | |
| 93 } | |
| 94 | |
| 95 float get_pressure_mbar(void) | |
| 96 { | |
| 97 return ambient_pressure_mbar; | |
| 98 } | |
| 99 | |
| 100 float get_surface_mbar(void) | |
| 101 { | |
| 102 return surface_pressure_mbar; | |
| 103 } | |
| 104 | |
| 105 | |
| 106 void init_surface_ring(void) | |
| 107 { | |
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108 if(surface_ring_mbar[0] == 0) /* only initialize once. Keep value in place in case of an i2c recovery */ |
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109 { |
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110 for(int i=0; i<PRESSURE_SURFACE_QUE; i++) |
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111 surface_ring_mbar[i] = ambient_pressure_mbar; |
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112 surface_pressure_mbar = ambient_pressure_mbar; |
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113 } |
| 38 | 114 } |
| 115 | |
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116 void init_pressure_history(void) |
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117 { |
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118 for(int i=0; i<PRESSURE_HISTORY_SIZE; i++) |
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119 { |
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120 pressure_history_mbar[i] = 1000.0; |
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121 } |
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122 } |
| 38 | 123 |
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124 |
| 38 | 125 void update_surface_pressure(uint8_t call_rhythm_seconds) |
| 126 { | |
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127 static uint8_t writeIndex = 0; /* Reinitialization will reset all entries to the same value => no need to reinit write index */ |
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128 static uint8_t avgCount = 0; |
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129 static float runningAvg = 0; |
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130 |
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131 if(is_init_pressure_done()) |
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132 { |
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133 runningAvg = (runningAvg * avgCount + ambient_pressure_mbar) / (avgCount +1); |
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134 avgCount++; |
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135 secondCounterSurfaceRing += call_rhythm_seconds; |
| 38 | 136 |
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137 if(secondCounterSurfaceRing >= 60) |
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138 { |
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139 surface_ring_mbar[writeIndex] = runningAvg; |
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140 writeIndex++; /* the write index is now pointing to the oldest value in the buffer which will be overwritten next time */ |
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141 |
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142 if(writeIndex == PRESSURE_SURFACE_QUE) |
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143 { |
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144 writeIndex = 0; |
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145 } |
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146 |
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147 surface_pressure_mbar = surface_ring_mbar[writeIndex]; /* 30 minutes old measurement */ |
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148 |
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149 secondCounterSurfaceRing = 0; |
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150 avgCount = 1; /* use the current value as starting point but restart the weight decrement of the measurements */ |
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151 } |
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152 } |
| 38 | 153 } |
| 154 | |
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155 #ifdef DEMOMODE |
| 38 | 156 float demo_modify_temperature_helper(float bottom_mbar_diff_to_surface) |
| 157 { | |
| 158 const float temperature_surface = 31.0; | |
| 159 const float temperature_bottom = 14.0; | |
| 160 | |
| 161 const float temperature_difference = temperature_bottom - temperature_surface; | |
| 162 | |
| 163 // range 0.0 - 1.0 | |
| 164 float position_now = (ambient_pressure_mbar - surface_pressure_mbar) / bottom_mbar_diff_to_surface; | |
| 165 | |
| 166 if(position_now <= 0) | |
| 167 return temperature_surface; | |
| 168 | |
| 169 if(position_now >= 1) | |
| 170 return temperature_bottom; | |
| 171 | |
| 172 return temperature_surface + (temperature_difference * position_now); | |
| 173 } | |
| 174 | |
| 175 | |
| 176 uint32_t demo_modify_temperature_and_pressure(int32_t divetime_in_seconds, uint8_t subseconds, float ceiling_mbar) | |
| 177 { | |
| 178 | |
| 179 const float descent_rate = 4000/60; | |
| 180 const float ascent_rate = 1000/60; | |
| 181 const uint32_t seconds_descend = (1 * 60) + 30; | |
| 182 const uint32_t turbo_seconds_at_bottom_start = (0 * 60) + 0; | |
| 183 const uint32_t seconds_descend_and_bottomtime = seconds_descend + turbo_seconds_at_bottom_start + (2 * 60) + 0; | |
| 184 uint32_t time_elapsed_in_seconds; | |
| 185 static float ambient_pressure_mbar_memory = 0; | |
| 186 static uint32_t time_last_call = 0; | |
| 187 | |
| 188 if(divetime_in_seconds <= seconds_descend) | |
| 189 { | |
| 190 ambient_pressure_mbar = (divetime_in_seconds * descent_rate) + ((float)(subseconds) * descent_rate) + surface_pressure_mbar; | |
| 191 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 192 | |
| 193 time_last_call = divetime_in_seconds; | |
| 194 return 0; | |
| 195 } | |
| 196 else | |
| 197 if(divetime_in_seconds <= seconds_descend + turbo_seconds_at_bottom_start) | |
| 198 { | |
| 199 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar; | |
| 200 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 201 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 202 time_last_call = divetime_in_seconds; | |
| 203 return turbo_seconds_at_bottom_start; | |
| 204 } | |
| 205 else | |
| 206 if(divetime_in_seconds <= seconds_descend_and_bottomtime) | |
| 207 { | |
| 208 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar; | |
| 209 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 210 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 211 time_last_call = divetime_in_seconds; | |
| 212 return 0; | |
| 213 } | |
| 214 else | |
| 215 { | |
| 216 time_elapsed_in_seconds = divetime_in_seconds - time_last_call; | |
| 217 ambient_pressure_mbar = ambient_pressure_mbar_memory - time_elapsed_in_seconds * ascent_rate; | |
| 218 | |
| 219 if(ambient_pressure_mbar < surface_pressure_mbar) | |
| 220 ambient_pressure_mbar = surface_pressure_mbar; | |
| 221 else if(ambient_pressure_mbar < ceiling_mbar) | |
| 222 ambient_pressure_mbar = ceiling_mbar; | |
| 223 | |
| 224 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 225 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 226 time_last_call = divetime_in_seconds; | |
| 227 return 0; | |
| 228 } | |
| 229 } | |
|
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230 #endif |
| 38 | 231 |
| 232 uint8_t is_init_pressure_done(void) | |
| 233 { | |
| 234 return pressureSensorInitSuccess; | |
| 235 } | |
| 236 | |
| 237 uint8_t init_pressure(void) | |
| 238 { | |
| 239 uint8_t buffer[1]; | |
| 240 buffer[0] = 0x1e; | |
| 241 uint8_t retValue = 0xFF; | |
| 242 | |
|
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243 pressureSensorInitSuccess = false; |
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244 init_pressure_history(); |
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245 |
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246 /* Send reset request to pressure sensor */ |
| 38 | 247 retValue = I2C_Master_Transmit( DEVICE_PRESSURE, buffer, 1); |
| 248 if(retValue != HAL_OK) | |
| 249 { | |
| 250 return (HAL_StatusTypeDef)retValue; | |
| 251 } | |
| 252 HAL_Delay(3); | |
| 253 | |
| 254 for(uint8_t i=0;i<8;i++) | |
| 255 { | |
| 256 C[i] = get_ci_by_coef_num(i); | |
| 257 } | |
| 258 n_crc = crc4(C); // no evaluation at the moment hw 151026 | |
| 259 | |
| 260 C5_x_2p8 = C[5] * 256; | |
| 261 C2_x_2p16 = C[2] * 65536; | |
| 262 C1_x_2p15 = C[1] * 32768; | |
| 263 | |
|
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264 if(global.I2C_SystemStatus == HAL_OK) |
| 38 | 265 { |
| 266 pressureSensorInitSuccess = 1; | |
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267 retValue = pressure_update(); |
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268 |
| 38 | 269 } |
|
331
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270 return retValue; |
| 38 | 271 } |
| 272 | |
| 273 | |
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274 static uint32_t get_adc(void) |
| 38 | 275 { |
| 276 uint8_t buffer[1]; | |
| 277 uint8_t resivebuf[4]; | |
| 278 uint32_t answer = 0; | |
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279 |
| 38 | 280 buffer[0] = 0x00; // Get ADC |
| 281 I2C_Master_Transmit( DEVICE_PRESSURE, buffer, 1); | |
| 282 I2C_Master_Receive( DEVICE_PRESSURE, resivebuf, 4); | |
| 283 resivebuf[3] = 0; | |
| 284 answer = 256*256 *(uint32_t)resivebuf[0] + 256 * (uint32_t)resivebuf[1] + (uint32_t)resivebuf[2]; | |
| 285 | |
| 286 return answer; | |
| 287 } | |
| 288 | |
| 289 | |
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290 static uint16_t get_ci_by_coef_num(uint8_t coef_num) |
| 38 | 291 { |
| 292 uint8_t resivebuf[2]; | |
| 293 | |
| 294 uint8_t cmd = CMD_PROM_RD+coef_num*2; | |
| 295 I2C_Master_Transmit( DEVICE_PRESSURE, &cmd, 1); | |
| 296 I2C_Master_Receive( DEVICE_PRESSURE, resivebuf, 2); | |
| 297 return (256*(uint16_t)resivebuf[0]) + (uint16_t)resivebuf[1]; | |
| 298 } | |
| 299 | |
| 300 | |
| 301 | |
| 302 uint8_t pressure_update(void) | |
| 303 { | |
| 304 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; | |
| 305 | |
| 306 statusReturn = pressure_sensor_get_data(); | |
| 307 pressure_calculation(); | |
| 308 return (uint8_t)statusReturn; | |
| 309 } | |
| 310 | |
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311 /* Switch between pressure and temperature measurement with every successful read operation */ |
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312 void pressure_update_alternating(void) |
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313 { |
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314 static uint8_t getTemperature= 0; |
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315 |
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316 if(getTemperature) |
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317 { |
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318 if(pressure_sensor_get_temperature_raw() == HAL_OK) |
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319 { |
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320 getTemperature = 0; |
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321 } |
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322 } |
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323 else |
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324 { |
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325 if(pressure_sensor_get_pressure_raw() == HAL_OK) |
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326 { |
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327 getTemperature = 1; |
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328 } |
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329 } |
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330 pressure_calculation(); |
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331 return; |
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332 } |
| 38 | 333 |
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334 static uint32_t pressure_sensor_get_one_value(uint8_t cmd, HAL_StatusTypeDef *statusReturn) |
| 38 | 335 { |
| 336 uint8_t command = CMD_ADC_CONV + cmd; | |
| 337 HAL_StatusTypeDef statusReturnTemp = HAL_TIMEOUT; | |
| 338 | |
| 339 statusReturnTemp = I2C_Master_Transmit( DEVICE_PRESSURE, &command, 1); | |
| 340 | |
| 341 if(statusReturn) | |
| 342 { | |
| 343 *statusReturn = statusReturnTemp; | |
| 344 } | |
| 345 | |
| 346 switch (cmd & 0x0f) // wait necessary conversion time | |
| 347 { | |
| 348 case CMD_ADC_256 : HAL_Delay(1); break; | |
| 349 case CMD_ADC_512 : HAL_Delay(3); break; | |
| 350 case CMD_ADC_1024: HAL_Delay(4); break; | |
| 351 case CMD_ADC_2048: HAL_Delay(6); break; | |
| 352 case CMD_ADC_4096: HAL_Delay(10); break; | |
| 353 } | |
| 354 return get_adc(); | |
| 355 } | |
| 356 | |
| 357 | |
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358 static HAL_StatusTypeDef pressure_sensor_get_data(void) |
| 38 | 359 { |
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360 uint32_t requestedValue = 0; |
| 38 | 361 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT; |
| 362 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT; | |
| 363 | |
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364 |
| 38 | 365 |
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366 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn2); |
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367 if (statusReturn2 == HAL_OK) |
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368 { |
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369 D2 = requestedValue; |
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370 } |
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371 |
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372 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn1); |
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373 if (statusReturn1 == HAL_OK) |
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374 { |
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375 D1 = requestedValue; |
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376 } |
| 38 | 377 if(statusReturn2 > statusReturn1) // if anything is not HAL_OK (0x00) or worse |
| 378 return statusReturn2; | |
| 379 else | |
| 380 return statusReturn1; | |
| 381 } | |
| 382 | |
| 383 | |
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384 HAL_StatusTypeDef pressure_sensor_get_pressure_raw(void) |
| 38 | 385 { |
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386 uint32_t requestedValue = 0; |
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387 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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388 |
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389 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn); |
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390 if (statusReturn == HAL_OK) |
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391 { |
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392 D1 = requestedValue; |
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393 } |
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394 |
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395 return statusReturn; |
| 38 | 396 } |
| 397 | |
| 398 | |
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399 HAL_StatusTypeDef pressure_sensor_get_temperature_raw(void) |
| 38 | 400 { |
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401 uint32_t requestedValue = 0; |
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402 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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403 |
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404 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn); |
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405 if (statusReturn == HAL_OK) |
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406 { |
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407 D2 = requestedValue; |
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408 } |
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409 return statusReturn; |
| 38 | 410 } |
| 411 | |
| 412 | |
| 413 void pressure_calculation(void) | |
| 414 { | |
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415 if(global.I2C_SystemStatus != HAL_OK) |
| 38 | 416 return; |
| 417 | |
| 418 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(); | |
| 419 } | |
| 420 | |
|
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421 static uint8_t pressure_plausible(float pressurevalue) |
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422 { |
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423 static uint8_t pressurewriteindex = 0; |
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424 uint8_t retval = 0; |
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425 uint8_t index; |
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426 float pressure_average = 0; |
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427 |
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428 for(index = 0; index < PRESSURE_HISTORY_SIZE; index++) |
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429 { |
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430 pressure_average += pressure_history_mbar[index]; |
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431 } |
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432 pressure_average /= PRESSURE_HISTORY_SIZE; |
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433 if(pressure_average == 1000.0) /* first pressure calculation */ |
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434 { |
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435 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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436 { |
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437 for(index = 0; index < PRESSURE_HISTORY_SIZE; index++) |
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438 { |
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439 pressure_history_mbar[index] = pressurevalue; /* set history to current value */ |
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440 retval = 1; |
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441 } |
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442 } |
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443 } |
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444 else |
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445 { |
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446 if(fabs(pressurevalue - pressure_average) < PRESSURE_JUMP_VALID_MBAR) |
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447 pressure_history_mbar[pressurewriteindex++] = pressurevalue; |
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448 pressurewriteindex &= 0x7; /* wrap around if necessary */ |
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449 retval = 1; |
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450 } |
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451 |
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452 return retval; |
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453 } |
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454 |
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455 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void) |
| 38 | 456 { |
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457 static float runningAvg = 0; |
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458 static uint8_t avgCnt = 0; |
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459 |
| 38 | 460 uint32_t local_D1; // ADC value of the pressure conversion |
| 461 uint32_t local_D2; // ADC value of the temperature conversion | |
| 462 int32_t local_Px10; // compensated pressure value | |
| 463 int32_t local_Tx100; // compensated temperature value | |
| 464 int64_t local_dT; // int32_t, difference between actual and measured temperature | |
| 465 int64_t local_OFF; // offset at actual temperature | |
| 466 int64_t local_SENS; // sensitivity at actual temperature | |
| 467 | |
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468 float calc_pressure; |
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469 |
| 38 | 470 int64_t T2; |
| 471 int64_t OFF2; | |
| 472 int64_t SENS2; | |
| 473 | |
| 474 local_D1 = D1; | |
| 475 local_D2 = D2; | |
| 476 | |
| 477 local_dT = ((int64_t)local_D2) - ((int64_t)C[5]) * 256; //pow(2,8); | |
| 478 local_OFF = ((int64_t)C[2]) * 65536 + local_dT * ((int64_t)C[4]) / 128; // pow(2,16), pow(2,7) | |
| 479 local_SENS = ((int64_t)C[1]) * 32768 + local_dT * ((int64_t)C[3]) / 256; // pow(2,15), pow(2,8) | |
| 480 | |
| 481 local_Tx100 = (int32_t)(2000 + (local_dT * ((int64_t)C[6])) / 8388608);// pow(2,23) | |
| 482 | |
| 483 | |
| 484 if(local_Tx100 < 2000) // low temperature | |
| 485 { | |
| 486 T2 = 3 * local_dT; | |
| 487 T2 *= local_dT; | |
| 488 T2 /= 8589934592; | |
| 489 | |
| 490 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 491 OFF2 *= OFF2; | |
| 492 OFF2 *= 3; | |
| 493 OFF2 /= 2; | |
| 494 | |
| 495 SENS2 = ((int64_t)local_Tx100) - 2000; | |
| 496 SENS2 *= SENS2; | |
| 497 SENS2 *= 5; | |
| 498 SENS2 /= 8; | |
| 499 | |
| 500 local_Tx100 -= (int32_t)T2; | |
| 501 local_OFF -= OFF2; | |
| 502 local_SENS -= SENS2; | |
| 503 } | |
| 504 else | |
| 505 { | |
| 506 T2 = 7 * local_dT; | |
| 507 T2 *= local_dT; | |
| 508 T2 /= 137438953472; | |
| 509 | |
| 510 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 511 OFF2 *= OFF2; | |
| 512 OFF2 /= 16; | |
| 513 | |
| 514 local_Tx100 -= (int32_t)T2; | |
| 515 local_OFF -= OFF2; | |
| 516 } | |
| 517 | |
| 518 local_Px10 = (int32_t)( | |
| 519 (((int64_t)((local_D1 * local_SENS) / 2097152)) - local_OFF) | |
| 520 / 8192 );// )) / 10; // pow(2,21), pow(2,13) | |
| 521 | |
| 522 ambient_temperature = ((float)local_Tx100) / 100; | |
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523 |
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524 calc_pressure = ((float)local_Px10) / 10; |
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525 if(pressure_plausible(calc_pressure)) |
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526 { |
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527 runningAvg = (avgCnt * runningAvg + calc_pressure) / (avgCnt + 1); |
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528 if (avgCnt < 10) /* build an average considering the last measurements to a a weight "1 of 10" */ |
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529 { /* Main reason for this is the jitter of up to +-10 HPa in surface mode which is caused */ |
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530 avgCnt++; /* by the measurement range of the sensor which is focused on under water pressure measurement */ |
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531 } |
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532 ambient_pressure_mbar = runningAvg; |
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533 } |
| 38 | 534 } |
| 535 | |
| 536 | |
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537 /* |
| 38 | 538 void pressure_calculation_new(void) |
| 539 { | |
| 540 #define POW2_8 (256) | |
| 541 #define POW2_17 (131072) | |
| 542 #define POW2_6 (64) | |
| 543 #define POW2_16 (65536) | |
| 544 #define POW2_7 (128) | |
| 545 #define POW2_23 (8388608) | |
| 546 #define POW2_21 (2097152) | |
| 547 #define POW2_15 (32768) | |
| 548 #define POW2_13 (8192) | |
| 549 #define POW2_37 (137438953472) | |
| 550 #define POW2_4 (16) | |
| 551 #define POW2_33 (8589934592) | |
| 552 #define POW2_3 (8) | |
| 553 | |
| 554 int32_t P; // compensated pressure value | |
| 555 int32_t T; // compensated temperature value | |
| 556 int32_t dT; // difference between actual and measured temperature | |
| 557 int64_t OFF; // offset at actual temperature | |
| 558 int64_t SENS; | |
| 559 | |
| 560 int32_t T2; | |
| 561 int64_t OFF2; | |
| 562 int64_t SENS2; | |
| 563 | |
| 564 dT = ((int32_t)D2) - ((int32_t)C[5]) * POW2_8; | |
| 565 OFF = ((int64_t)C[2]) * POW2_16 + ((int64_t)dT) * ((int64_t)C[4]) / POW2_7; | |
| 566 SENS = ((int64_t)C[1]) * POW2_15 + ((int64_t)dT) * ((int64_t)C[3]) / POW2_8; | |
| 567 | |
| 568 T = 2000 + (dT * ((int32_t)C[6])) / POW2_23; | |
| 569 | |
| 570 | |
| 571 if(T < 2000) // low temperature | |
| 572 { | |
| 573 T2 = 3 * dT * dT; | |
| 574 T2 /= POW2_33; | |
| 575 OFF2 = ((int64_t)T) - 2000; | |
| 576 OFF2 *= OFF2; | |
| 577 OFF2 *= 3; | |
| 578 OFF2 /= 2; | |
| 579 SENS2 = ((int64_t)T) - 2000; | |
| 580 SENS2 *= SENS2; | |
| 581 SENS2 *= 5; | |
| 582 SENS2 /= POW2_3; | |
| 583 } | |
| 584 else // high temperature | |
| 585 { | |
| 586 T2 = 7 * dT * dT; | |
| 587 T2 /= POW2_37; | |
| 588 OFF2 = ((int64_t)T) - 2000; | |
| 589 OFF2 *= OFF2; | |
| 590 OFF2 /= POW2_4; | |
| 591 SENS2 = 0; | |
| 592 } | |
| 593 | |
| 594 T = T - T2; | |
| 595 OFF = OFF - OFF2; | |
| 596 SENS = SENS - SENS2; | |
| 597 | |
| 598 P = (int32_t)(((((int64_t)D1) * SENS) / POW2_21 - OFF) / POW2_13); | |
| 599 | |
| 600 ambient_temperature = ((float)T) / 100; | |
| 601 ambient_pressure_mbar = ((float)P) / 10; | |
| 602 } | |
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603 */ |
| 38 | 604 |
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605 /* |
| 38 | 606 void pressure_calculation_old(void) { |
| 607 // | |
| 608 double ambient_temperature_centigrad = 0; | |
| 609 double ambient_pressure_decimbar = 0; | |
| 610 | |
| 611 // static for debug | |
| 612 static int64_t dt = 0; | |
| 613 static int64_t temp = 0; | |
| 614 static int64_t ms_off = 0; | |
| 615 static int64_t sens = 0; | |
| 616 // | |
| 617 static int64_t ms_off2 = 0; | |
| 618 static int64_t sens2 = 0; | |
| 619 static int64_t t2 = 0; | |
| 620 | |
| 621 if((D2 == 0) || (D1 == 0)) | |
| 622 return; | |
| 623 // | |
| 624 | |
| 625 // dT = D2 - C[5] * POW2_8; | |
| 626 // T = 2000 + (dT * C[6]) / POW2_23; | |
| 627 dt = (int64_t)D2 - C5_x_2p8; | |
| 628 //temp ; // in 10 milliGrad Celcius | |
| 629 ambient_temperature_centigrad = 2000 + dt * C[6] / 8388608; | |
| 630 | |
| 631 | |
| 632 if(ambient_temperature_centigrad < 2000) // low temperature | |
| 633 { | |
| 634 t2 = 3 * dt; | |
| 635 t2 *= dt; | |
| 636 t2 /= 8589934592; | |
| 637 ms_off2 = ambient_temperature_centigrad - 2000; | |
| 638 ms_off2 *= ms_off2; | |
| 639 sens2 = ms_off2; | |
| 640 ms_off2 *= 3; | |
| 641 ms_off2 /= 2; | |
| 642 sens2 *= 5; | |
| 643 sens2 /= 8; | |
| 644 } | |
| 645 else // high temperature | |
| 646 { | |
| 647 t2 = 7 * dt; | |
| 648 t2 *= dt; | |
| 649 t2 /= 137438953472; | |
| 650 ms_off2 = ambient_temperature_centigrad - 2000; | |
| 651 ms_off2 *= ms_off2; | |
| 652 ms_off2 /= 16; | |
| 653 sens2 = 0; | |
| 654 } | |
| 655 | |
| 656 | |
| 657 // | |
| 658 | |
| 659 // pressure | |
| 660 // OFF = C[2] * POW2_16 + dT * C[4] / POW2_7; | |
| 661 // SENS = C[1] * POW2_15 + dT * C[3] / POW2_8; | |
| 662 ms_off = C[4] * dt; | |
| 663 ms_off /= 128; | |
| 664 ms_off += C2_x_2p16; | |
| 665 // | |
| 666 sens = C[3] * dt; | |
| 667 sens /= 256; | |
| 668 sens += C1_x_2p15; | |
| 669 | |
| 670 // 2nd order correction | |
| 671 ambient_temperature_centigrad -= t2; | |
| 672 ms_off -= ms_off2; | |
| 673 sens -= sens2; | |
| 674 | |
| 675 ambient_temperature = ambient_temperature_centigrad / 100; | |
| 676 // P = (D1 * SENS / POW2_21 - OFF) / POW2_13; | |
| 677 temp = D1 * sens; | |
| 678 temp /= 2097152; | |
| 679 temp -= ms_off; | |
| 680 temp /= 8192; | |
| 681 ambient_pressure_decimbar = temp; // to float/double | |
| 682 ambient_pressure_mbar = ambient_pressure_decimbar / 10; | |
| 683 } | |
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684 */ |
| 38 | 685 |
| 686 | |
| 687 /* taken from AN520 by meas-spec.com dated 9. Aug. 2011 | |
| 688 * short and int are both 16bit according to AVR/GCC google results | |
| 689 */ | |
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690 static uint8_t crc4(uint16_t n_prom[]) |
| 38 | 691 { |
| 692 uint16_t cnt; // simple counter | |
| 693 uint16_t n_rem; // crc reminder | |
| 694 uint16_t crc_read; // original value of the crc | |
| 695 uint8_t n_bit; | |
| 696 n_rem = 0x00; | |
| 697 crc_read=n_prom[7]; //save read CRC | |
| 698 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0 | |
| 699 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes | |
| 700 { // choose LSB or MSB | |
| 701 if (cnt%2==1) n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF); | |
| 702 else n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8); | |
| 703 for (n_bit = 8; n_bit > 0; n_bit--) | |
| 704 { | |
| 705 if (n_rem & (0x8000)) | |
| 706 { | |
| 707 n_rem = (n_rem << 1) ^ 0x3000; | |
| 708 } | |
| 709 else | |
| 710 { | |
| 711 n_rem = (n_rem << 1); | |
| 712 } | |
| 713 } | |
| 714 } | |
| 715 n_rem= (0x000F & (n_rem >> 12)); // // final 4-bit reminder is CRC code | |
| 716 n_prom[7]=crc_read; // restore the crc_read to its original place | |
| 717 return (n_rem ^ 0x00); | |
| 718 } | |
| 719 /* | |
| 720 void test_calculation(void) | |
| 721 { | |
| 722 C1 = 29112; | |
| 723 C2 = 26814; | |
| 724 C3 = 19125; | |
| 725 C4 = 17865; | |
| 726 C5 = 32057; | |
| 727 C6 = 31305; | |
| 728 | |
| 729 C2_x_2p16 = C2 * 65536; | |
| 730 C1_x_2p15 = C1 * 32768; | |
| 731 | |
| 732 D1 = 4944364; | |
| 733 D2 = 8198974; | |
| 734 pressure_calculation() ; | |
| 735 }; | |
| 736 */ | |
| 737 |