Mercurial > public > ostc4
annotate Small_CPU/Src/pressure.c @ 339:37f45300bc2e PressureMeasure_Improvment
Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
Activated pressure / temperature offsets: The functionality to store offsets was already present in the firmware but values have not been apllied in the RTE => added functionality to include offsets in calculation
Set Max possible surface pressure to 1070hPa (Black sea level)
| author | ideenmodellierer |
|---|---|
| date | Sat, 17 Aug 2019 19:03:47 +0200 |
| parents | c11ce8c885d3 |
| children | 591c03a1e68d 4093ac18b25c |
| 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_SURFACE_MAX_MBAR (1070.0f) /* It is very unlikely that pressure at surface is greater than this value => clip to it */ |
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50 #define PRESSURE_HISTORY_SIZE (8u) |
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51 #define PRESSURE_JUMP_VALID_MBAR (500.0f) /* values are measure several times a second => jumps > 5m very unlikely */ |
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52 |
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53 #define PRESSURE_SURFACE_QUE (30u) /* history buffer [minutes] for past pressure measurements */ |
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54 |
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55 static uint16_t get_ci_by_coef_num(uint8_t coef_num); |
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56 //void pressure_calculation_new(void); |
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57 //void pressure_calculation_old(void); |
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58 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void); |
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59 static uint8_t crc4(uint16_t n_prom[]); |
| 38 | 60 |
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61 static HAL_StatusTypeDef pressure_sensor_get_data(void); |
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62 static uint32_t get_adc(void); |
| 38 | 63 uint8_t pressureSensorInitSuccess = 0; |
| 64 | |
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65 static uint16_t C[8] = { 1 }; |
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66 static uint32_t D1 = 1; |
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67 static uint32_t D2 = 1; |
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68 static uint8_t n_crc; |
| 38 | 69 |
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70 static int64_t C5_x_2p8 = 1; |
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71 static int64_t C2_x_2p16 = 1; |
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72 static int64_t C1_x_2p15 = 1; |
| 38 | 73 |
| 74 /* | |
| 75 short C2plus10000 = -1; | |
| 76 short C3plus200 = -1; | |
| 77 short C4minus250 = -1; | |
| 78 short UT1 = -1; | |
| 79 short C6plus100 = -1; | |
| 80 */ | |
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81 static float pressure_offset = 0.0; /* Offset value which may be specified by the user via PC Software */ |
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82 static float temperature_offset = 0.0; /* Offset value which may be specified by the user via PC Software */ |
| 38 | 83 |
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84 static float ambient_temperature = 0; |
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85 static float ambient_pressure_mbar = 1000.0; |
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86 static float surface_pressure_mbar = 1000.0; |
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87 static float surface_ring_mbar[PRESSURE_SURFACE_QUE] = { 0 }; |
| 38 | 88 |
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89 static float pressure_history_mbar[PRESSURE_HISTORY_SIZE]; |
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90 |
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91 static uint8_t secondCounterSurfaceRing = 0; |
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92 static uint8_t avgCount = 0; |
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93 static float runningAvg = 0; |
| 38 | 94 |
| 95 float get_temperature(void) | |
| 96 { | |
| 97 return ambient_temperature; | |
| 98 } | |
| 99 | |
| 100 float get_pressure_mbar(void) | |
| 101 { | |
| 102 return ambient_pressure_mbar; | |
| 103 } | |
| 104 | |
| 105 float get_surface_mbar(void) | |
| 106 { | |
| 107 return surface_pressure_mbar; | |
| 108 } | |
| 109 | |
| 110 | |
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111 void init_surface_ring(uint8_t force) |
| 38 | 112 { |
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113 if((surface_ring_mbar[0] == 0) || (force)) /* only initialize once. Keep value in place in case of an i2c recovery */ |
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114 { |
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115 secondCounterSurfaceRing = 0; /* restart calculation */ |
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116 avgCount = 0; |
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117 runningAvg = 0; |
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118 |
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119 for(int i=0; i<PRESSURE_SURFACE_QUE; i++) |
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120 surface_ring_mbar[i] = ambient_pressure_mbar; |
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121 surface_pressure_mbar = ambient_pressure_mbar; |
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122 } |
| 38 | 123 } |
| 124 | |
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125 void init_pressure_history(void) |
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126 { |
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127 for(int i=0; i<PRESSURE_HISTORY_SIZE; i++) |
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128 { |
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129 pressure_history_mbar[i] = 1000.0; |
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130 } |
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131 } |
| 38 | 132 |
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133 |
| 38 | 134 void update_surface_pressure(uint8_t call_rhythm_seconds) |
| 135 { | |
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136 static uint8_t writeIndex = 0; /* Reinitialization will reset all entries to the same value => no need to reinit write index */ |
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137 |
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138 |
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139 if(is_init_pressure_done()) |
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140 { |
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141 runningAvg = (runningAvg * avgCount + ambient_pressure_mbar) / (avgCount +1); |
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142 avgCount++; |
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143 secondCounterSurfaceRing += call_rhythm_seconds; |
| 38 | 144 |
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145 if(secondCounterSurfaceRing >= 60) |
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146 { |
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147 if(runningAvg < PRESSURE_SURFACE_MAX_MBAR) |
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148 { |
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149 surface_ring_mbar[writeIndex] = runningAvg; |
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150 } |
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151 else |
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152 { |
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153 surface_ring_mbar[writeIndex] = PRESSURE_SURFACE_MAX_MBAR; |
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154 } |
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155 writeIndex++; /* the write index is now pointing to the oldest value in the buffer which will be overwritten next time */ |
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156 |
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157 if(writeIndex == PRESSURE_SURFACE_QUE) |
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158 { |
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159 writeIndex = 0; |
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160 } |
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161 |
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162 surface_pressure_mbar = surface_ring_mbar[writeIndex]; /* 30 minutes old measurement */ |
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163 |
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164 secondCounterSurfaceRing = 0; |
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165 avgCount = 1; /* use the current value as starting point but restart the weight decrement of the measurements */ |
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166 } |
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167 } |
| 38 | 168 } |
| 169 | |
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170 #ifdef DEMOMODE |
| 38 | 171 float demo_modify_temperature_helper(float bottom_mbar_diff_to_surface) |
| 172 { | |
| 173 const float temperature_surface = 31.0; | |
| 174 const float temperature_bottom = 14.0; | |
| 175 | |
| 176 const float temperature_difference = temperature_bottom - temperature_surface; | |
| 177 | |
| 178 // range 0.0 - 1.0 | |
| 179 float position_now = (ambient_pressure_mbar - surface_pressure_mbar) / bottom_mbar_diff_to_surface; | |
| 180 | |
| 181 if(position_now <= 0) | |
| 182 return temperature_surface; | |
| 183 | |
| 184 if(position_now >= 1) | |
| 185 return temperature_bottom; | |
| 186 | |
| 187 return temperature_surface + (temperature_difference * position_now); | |
| 188 } | |
| 189 | |
| 190 | |
| 191 uint32_t demo_modify_temperature_and_pressure(int32_t divetime_in_seconds, uint8_t subseconds, float ceiling_mbar) | |
| 192 { | |
| 193 | |
| 194 const float descent_rate = 4000/60; | |
| 195 const float ascent_rate = 1000/60; | |
| 196 const uint32_t seconds_descend = (1 * 60) + 30; | |
| 197 const uint32_t turbo_seconds_at_bottom_start = (0 * 60) + 0; | |
| 198 const uint32_t seconds_descend_and_bottomtime = seconds_descend + turbo_seconds_at_bottom_start + (2 * 60) + 0; | |
| 199 uint32_t time_elapsed_in_seconds; | |
| 200 static float ambient_pressure_mbar_memory = 0; | |
| 201 static uint32_t time_last_call = 0; | |
| 202 | |
| 203 if(divetime_in_seconds <= seconds_descend) | |
| 204 { | |
| 205 ambient_pressure_mbar = (divetime_in_seconds * descent_rate) + ((float)(subseconds) * descent_rate) + surface_pressure_mbar; | |
| 206 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 207 | |
| 208 time_last_call = divetime_in_seconds; | |
| 209 return 0; | |
| 210 } | |
| 211 else | |
| 212 if(divetime_in_seconds <= seconds_descend + turbo_seconds_at_bottom_start) | |
| 213 { | |
| 214 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar; | |
| 215 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 216 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 217 time_last_call = divetime_in_seconds; | |
| 218 return turbo_seconds_at_bottom_start; | |
| 219 } | |
| 220 else | |
| 221 if(divetime_in_seconds <= seconds_descend_and_bottomtime) | |
| 222 { | |
| 223 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar; | |
| 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 else | |
| 230 { | |
| 231 time_elapsed_in_seconds = divetime_in_seconds - time_last_call; | |
| 232 ambient_pressure_mbar = ambient_pressure_mbar_memory - time_elapsed_in_seconds * ascent_rate; | |
| 233 | |
| 234 if(ambient_pressure_mbar < surface_pressure_mbar) | |
| 235 ambient_pressure_mbar = surface_pressure_mbar; | |
| 236 else if(ambient_pressure_mbar < ceiling_mbar) | |
| 237 ambient_pressure_mbar = ceiling_mbar; | |
| 238 | |
| 239 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 240 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 241 time_last_call = divetime_in_seconds; | |
| 242 return 0; | |
| 243 } | |
| 244 } | |
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245 #endif |
| 38 | 246 |
| 247 uint8_t is_init_pressure_done(void) | |
| 248 { | |
| 249 return pressureSensorInitSuccess; | |
| 250 } | |
| 251 | |
| 252 uint8_t init_pressure(void) | |
| 253 { | |
| 254 uint8_t buffer[1]; | |
| 255 buffer[0] = 0x1e; | |
| 256 uint8_t retValue = 0xFF; | |
| 257 | |
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258 pressureSensorInitSuccess = false; |
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259 init_pressure_history(); |
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260 |
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261 /* Send reset request to pressure sensor */ |
| 38 | 262 retValue = I2C_Master_Transmit( DEVICE_PRESSURE, buffer, 1); |
| 263 if(retValue != HAL_OK) | |
| 264 { | |
| 265 return (HAL_StatusTypeDef)retValue; | |
| 266 } | |
| 267 HAL_Delay(3); | |
| 268 | |
| 269 for(uint8_t i=0;i<8;i++) | |
| 270 { | |
| 271 C[i] = get_ci_by_coef_num(i); | |
| 272 } | |
| 273 n_crc = crc4(C); // no evaluation at the moment hw 151026 | |
| 274 | |
| 275 C5_x_2p8 = C[5] * 256; | |
| 276 C2_x_2p16 = C[2] * 65536; | |
| 277 C1_x_2p15 = C[1] * 32768; | |
| 278 | |
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279 if(global.I2C_SystemStatus == HAL_OK) |
| 38 | 280 { |
| 281 pressureSensorInitSuccess = 1; | |
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282 retValue = pressure_update(); |
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283 |
| 38 | 284 } |
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285 return retValue; |
| 38 | 286 } |
| 287 | |
| 288 | |
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289 static uint32_t get_adc(void) |
| 38 | 290 { |
| 291 uint8_t buffer[1]; | |
| 292 uint8_t resivebuf[4]; | |
| 293 uint32_t answer = 0; | |
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294 |
| 38 | 295 buffer[0] = 0x00; // Get ADC |
| 296 I2C_Master_Transmit( DEVICE_PRESSURE, buffer, 1); | |
| 297 I2C_Master_Receive( DEVICE_PRESSURE, resivebuf, 4); | |
| 298 resivebuf[3] = 0; | |
| 299 answer = 256*256 *(uint32_t)resivebuf[0] + 256 * (uint32_t)resivebuf[1] + (uint32_t)resivebuf[2]; | |
| 300 | |
| 301 return answer; | |
| 302 } | |
| 303 | |
| 304 | |
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305 static uint16_t get_ci_by_coef_num(uint8_t coef_num) |
| 38 | 306 { |
| 307 uint8_t resivebuf[2]; | |
| 308 | |
| 309 uint8_t cmd = CMD_PROM_RD+coef_num*2; | |
| 310 I2C_Master_Transmit( DEVICE_PRESSURE, &cmd, 1); | |
| 311 I2C_Master_Receive( DEVICE_PRESSURE, resivebuf, 2); | |
| 312 return (256*(uint16_t)resivebuf[0]) + (uint16_t)resivebuf[1]; | |
| 313 } | |
| 314 | |
| 315 | |
| 316 | |
| 317 uint8_t pressure_update(void) | |
| 318 { | |
| 319 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; | |
| 320 | |
| 321 statusReturn = pressure_sensor_get_data(); | |
| 322 pressure_calculation(); | |
| 323 return (uint8_t)statusReturn; | |
| 324 } | |
| 325 | |
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326 /* Switch between pressure and temperature measurement with every successful read operation */ |
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327 void pressure_update_alternating(void) |
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328 { |
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329 static uint8_t getTemperature= 0; |
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330 |
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331 if(getTemperature) |
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332 { |
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333 if(pressure_sensor_get_temperature_raw() == HAL_OK) |
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334 { |
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335 getTemperature = 0; |
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336 } |
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337 } |
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338 else |
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339 { |
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340 if(pressure_sensor_get_pressure_raw() == HAL_OK) |
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341 { |
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342 getTemperature = 1; |
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343 } |
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344 } |
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345 pressure_calculation(); |
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346 return; |
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347 } |
| 38 | 348 |
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349 static uint32_t pressure_sensor_get_one_value(uint8_t cmd, HAL_StatusTypeDef *statusReturn) |
| 38 | 350 { |
| 351 uint8_t command = CMD_ADC_CONV + cmd; | |
| 352 HAL_StatusTypeDef statusReturnTemp = HAL_TIMEOUT; | |
| 353 | |
| 354 statusReturnTemp = I2C_Master_Transmit( DEVICE_PRESSURE, &command, 1); | |
| 355 | |
| 356 if(statusReturn) | |
| 357 { | |
| 358 *statusReturn = statusReturnTemp; | |
| 359 } | |
| 360 | |
| 361 switch (cmd & 0x0f) // wait necessary conversion time | |
| 362 { | |
| 363 case CMD_ADC_256 : HAL_Delay(1); break; | |
| 364 case CMD_ADC_512 : HAL_Delay(3); break; | |
| 365 case CMD_ADC_1024: HAL_Delay(4); break; | |
| 366 case CMD_ADC_2048: HAL_Delay(6); break; | |
| 367 case CMD_ADC_4096: HAL_Delay(10); break; | |
| 368 } | |
| 369 return get_adc(); | |
| 370 } | |
| 371 | |
| 372 | |
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373 static HAL_StatusTypeDef pressure_sensor_get_data(void) |
| 38 | 374 { |
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375 uint32_t requestedValue = 0; |
| 38 | 376 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT; |
| 377 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT; | |
| 378 | |
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379 |
| 38 | 380 |
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381 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn2); |
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382 if (statusReturn2 == HAL_OK) |
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383 { |
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384 D2 = requestedValue; |
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385 } |
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386 |
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387 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn1); |
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388 if (statusReturn1 == HAL_OK) |
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389 { |
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390 D1 = requestedValue; |
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391 } |
| 38 | 392 if(statusReturn2 > statusReturn1) // if anything is not HAL_OK (0x00) or worse |
| 393 return statusReturn2; | |
| 394 else | |
| 395 return statusReturn1; | |
| 396 } | |
| 397 | |
| 398 | |
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399 HAL_StatusTypeDef pressure_sensor_get_pressure_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_D1 + CMD_ADC_1024, &statusReturn); |
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405 if (statusReturn == HAL_OK) |
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406 { |
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407 D1 = requestedValue; |
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408 } |
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409 |
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410 return statusReturn; |
| 38 | 411 } |
| 412 | |
| 413 | |
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414 HAL_StatusTypeDef pressure_sensor_get_temperature_raw(void) |
| 38 | 415 { |
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416 uint32_t requestedValue = 0; |
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417 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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418 |
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419 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn); |
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420 if (statusReturn == HAL_OK) |
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421 { |
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422 D2 = requestedValue; |
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423 } |
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424 return statusReturn; |
| 38 | 425 } |
| 426 | |
| 427 | |
| 428 void pressure_calculation(void) | |
| 429 { | |
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430 if(global.I2C_SystemStatus != HAL_OK) |
| 38 | 431 return; |
| 432 | |
| 433 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(); | |
| 434 } | |
| 435 | |
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436 static uint8_t pressure_plausible(float pressurevalue) |
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437 { |
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438 static uint8_t pressurewriteindex = 0; |
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439 uint8_t retval = 0; |
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440 uint8_t index; |
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441 float pressure_average = 0; |
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442 |
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443 for(index = 0; index < PRESSURE_HISTORY_SIZE; index++) |
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444 { |
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445 pressure_average += pressure_history_mbar[index]; |
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446 } |
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447 pressure_average /= PRESSURE_HISTORY_SIZE; |
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448 if(pressure_average == 1000.0) /* first pressure calculation */ |
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449 { |
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450 if(fabs(pressurevalue - pressure_average) < 11000.0) /* just in case a reset occur during dive assume value equal < 100m as valid */ |
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451 { |
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452 for(index = 0; index < PRESSURE_HISTORY_SIZE; index++) |
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453 { |
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454 pressure_history_mbar[index] = pressurevalue; /* set history to current value */ |
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455 retval = 1; |
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456 } |
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457 } |
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458 } |
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459 else |
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460 { |
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461 if(fabs(pressurevalue - pressure_average) < PRESSURE_JUMP_VALID_MBAR) |
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462 { |
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463 pressure_history_mbar[pressurewriteindex++] = pressurevalue; |
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464 pressurewriteindex &= 0x7; /* wrap around if necessary */ |
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465 retval = 1; |
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466 } |
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467 } |
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468 |
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469 return retval; |
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470 } |
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471 |
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472 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void) |
| 38 | 473 { |
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474 static float runningAvg = 0; |
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475 static uint8_t avgCnt = 0; |
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476 |
| 38 | 477 uint32_t local_D1; // ADC value of the pressure conversion |
| 478 uint32_t local_D2; // ADC value of the temperature conversion | |
| 479 int32_t local_Px10; // compensated pressure value | |
| 480 int32_t local_Tx100; // compensated temperature value | |
| 481 int64_t local_dT; // int32_t, difference between actual and measured temperature | |
| 482 int64_t local_OFF; // offset at actual temperature | |
| 483 int64_t local_SENS; // sensitivity at actual temperature | |
| 484 | |
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485 float calc_pressure; |
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486 |
| 38 | 487 int64_t T2; |
| 488 int64_t OFF2; | |
| 489 int64_t SENS2; | |
| 490 | |
| 491 local_D1 = D1; | |
| 492 local_D2 = D2; | |
| 493 | |
| 494 local_dT = ((int64_t)local_D2) - ((int64_t)C[5]) * 256; //pow(2,8); | |
| 495 local_OFF = ((int64_t)C[2]) * 65536 + local_dT * ((int64_t)C[4]) / 128; // pow(2,16), pow(2,7) | |
| 496 local_SENS = ((int64_t)C[1]) * 32768 + local_dT * ((int64_t)C[3]) / 256; // pow(2,15), pow(2,8) | |
| 497 | |
| 498 local_Tx100 = (int32_t)(2000 + (local_dT * ((int64_t)C[6])) / 8388608);// pow(2,23) | |
| 499 | |
| 500 | |
| 501 if(local_Tx100 < 2000) // low temperature | |
| 502 { | |
| 503 T2 = 3 * local_dT; | |
| 504 T2 *= local_dT; | |
| 505 T2 /= 8589934592; | |
| 506 | |
| 507 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 508 OFF2 *= OFF2; | |
| 509 OFF2 *= 3; | |
| 510 OFF2 /= 2; | |
| 511 | |
| 512 SENS2 = ((int64_t)local_Tx100) - 2000; | |
| 513 SENS2 *= SENS2; | |
| 514 SENS2 *= 5; | |
| 515 SENS2 /= 8; | |
| 516 | |
| 517 local_Tx100 -= (int32_t)T2; | |
| 518 local_OFF -= OFF2; | |
| 519 local_SENS -= SENS2; | |
| 520 } | |
| 521 else | |
| 522 { | |
| 523 T2 = 7 * local_dT; | |
| 524 T2 *= local_dT; | |
| 525 T2 /= 137438953472; | |
| 526 | |
| 527 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 528 OFF2 *= OFF2; | |
| 529 OFF2 /= 16; | |
| 530 | |
| 531 local_Tx100 -= (int32_t)T2; | |
| 532 local_OFF -= OFF2; | |
| 533 } | |
| 534 | |
| 535 local_Px10 = (int32_t)( | |
| 536 (((int64_t)((local_D1 * local_SENS) / 2097152)) - local_OFF) | |
| 537 / 8192 );// )) / 10; // pow(2,21), pow(2,13) | |
| 538 | |
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539 ambient_temperature = ((float)local_Tx100) / 100; |
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540 ambient_temperature += temperature_offset; |
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541 |
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542 calc_pressure = ((float)local_Px10) / 10; |
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543 calc_pressure += pressure_offset; |
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544 |
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545 if(pressure_plausible(calc_pressure)) |
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546 { |
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547 runningAvg = (avgCnt * runningAvg + calc_pressure) / (avgCnt + 1); |
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548 if (avgCnt < 10) /* build an average considering the last measurements to have a weight "1 of 10" */ |
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549 { /* Main reason for this is the jitter of up to +-10 HPa in surface mode which is caused */ |
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550 avgCnt++; /* by the measurement range of the sensor which is focused on under water pressure measurement */ |
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551 } |
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552 ambient_pressure_mbar = runningAvg; |
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553 } |
| 38 | 554 } |
| 555 | |
| 556 | |
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557 /* |
| 38 | 558 void pressure_calculation_new(void) |
| 559 { | |
| 560 #define POW2_8 (256) | |
| 561 #define POW2_17 (131072) | |
| 562 #define POW2_6 (64) | |
| 563 #define POW2_16 (65536) | |
| 564 #define POW2_7 (128) | |
| 565 #define POW2_23 (8388608) | |
| 566 #define POW2_21 (2097152) | |
| 567 #define POW2_15 (32768) | |
| 568 #define POW2_13 (8192) | |
| 569 #define POW2_37 (137438953472) | |
| 570 #define POW2_4 (16) | |
| 571 #define POW2_33 (8589934592) | |
| 572 #define POW2_3 (8) | |
| 573 | |
| 574 int32_t P; // compensated pressure value | |
| 575 int32_t T; // compensated temperature value | |
| 576 int32_t dT; // difference between actual and measured temperature | |
| 577 int64_t OFF; // offset at actual temperature | |
| 578 int64_t SENS; | |
| 579 | |
| 580 int32_t T2; | |
| 581 int64_t OFF2; | |
| 582 int64_t SENS2; | |
| 583 | |
| 584 dT = ((int32_t)D2) - ((int32_t)C[5]) * POW2_8; | |
| 585 OFF = ((int64_t)C[2]) * POW2_16 + ((int64_t)dT) * ((int64_t)C[4]) / POW2_7; | |
| 586 SENS = ((int64_t)C[1]) * POW2_15 + ((int64_t)dT) * ((int64_t)C[3]) / POW2_8; | |
| 587 | |
| 588 T = 2000 + (dT * ((int32_t)C[6])) / POW2_23; | |
| 589 | |
| 590 | |
| 591 if(T < 2000) // low temperature | |
| 592 { | |
| 593 T2 = 3 * dT * dT; | |
| 594 T2 /= POW2_33; | |
| 595 OFF2 = ((int64_t)T) - 2000; | |
| 596 OFF2 *= OFF2; | |
| 597 OFF2 *= 3; | |
| 598 OFF2 /= 2; | |
| 599 SENS2 = ((int64_t)T) - 2000; | |
| 600 SENS2 *= SENS2; | |
| 601 SENS2 *= 5; | |
| 602 SENS2 /= POW2_3; | |
| 603 } | |
| 604 else // high temperature | |
| 605 { | |
| 606 T2 = 7 * dT * dT; | |
| 607 T2 /= POW2_37; | |
| 608 OFF2 = ((int64_t)T) - 2000; | |
| 609 OFF2 *= OFF2; | |
| 610 OFF2 /= POW2_4; | |
| 611 SENS2 = 0; | |
| 612 } | |
| 613 | |
| 614 T = T - T2; | |
| 615 OFF = OFF - OFF2; | |
| 616 SENS = SENS - SENS2; | |
| 617 | |
| 618 P = (int32_t)(((((int64_t)D1) * SENS) / POW2_21 - OFF) / POW2_13); | |
| 619 | |
| 620 ambient_temperature = ((float)T) / 100; | |
| 621 ambient_pressure_mbar = ((float)P) / 10; | |
| 622 } | |
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623 */ |
| 38 | 624 |
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625 /* |
| 38 | 626 void pressure_calculation_old(void) { |
| 627 // | |
| 628 double ambient_temperature_centigrad = 0; | |
| 629 double ambient_pressure_decimbar = 0; | |
| 630 | |
| 631 // static for debug | |
| 632 static int64_t dt = 0; | |
| 633 static int64_t temp = 0; | |
| 634 static int64_t ms_off = 0; | |
| 635 static int64_t sens = 0; | |
| 636 // | |
| 637 static int64_t ms_off2 = 0; | |
| 638 static int64_t sens2 = 0; | |
| 639 static int64_t t2 = 0; | |
| 640 | |
| 641 if((D2 == 0) || (D1 == 0)) | |
| 642 return; | |
| 643 // | |
| 644 | |
| 645 // dT = D2 - C[5] * POW2_8; | |
| 646 // T = 2000 + (dT * C[6]) / POW2_23; | |
| 647 dt = (int64_t)D2 - C5_x_2p8; | |
| 648 //temp ; // in 10 milliGrad Celcius | |
| 649 ambient_temperature_centigrad = 2000 + dt * C[6] / 8388608; | |
| 650 | |
| 651 | |
| 652 if(ambient_temperature_centigrad < 2000) // low temperature | |
| 653 { | |
| 654 t2 = 3 * dt; | |
| 655 t2 *= dt; | |
| 656 t2 /= 8589934592; | |
| 657 ms_off2 = ambient_temperature_centigrad - 2000; | |
| 658 ms_off2 *= ms_off2; | |
| 659 sens2 = ms_off2; | |
| 660 ms_off2 *= 3; | |
| 661 ms_off2 /= 2; | |
| 662 sens2 *= 5; | |
| 663 sens2 /= 8; | |
| 664 } | |
| 665 else // high temperature | |
| 666 { | |
| 667 t2 = 7 * dt; | |
| 668 t2 *= dt; | |
| 669 t2 /= 137438953472; | |
| 670 ms_off2 = ambient_temperature_centigrad - 2000; | |
| 671 ms_off2 *= ms_off2; | |
| 672 ms_off2 /= 16; | |
| 673 sens2 = 0; | |
| 674 } | |
| 675 | |
| 676 | |
| 677 // | |
| 678 | |
| 679 // pressure | |
| 680 // OFF = C[2] * POW2_16 + dT * C[4] / POW2_7; | |
| 681 // SENS = C[1] * POW2_15 + dT * C[3] / POW2_8; | |
| 682 ms_off = C[4] * dt; | |
| 683 ms_off /= 128; | |
| 684 ms_off += C2_x_2p16; | |
| 685 // | |
| 686 sens = C[3] * dt; | |
| 687 sens /= 256; | |
| 688 sens += C1_x_2p15; | |
| 689 | |
| 690 // 2nd order correction | |
| 691 ambient_temperature_centigrad -= t2; | |
| 692 ms_off -= ms_off2; | |
| 693 sens -= sens2; | |
| 694 | |
| 695 ambient_temperature = ambient_temperature_centigrad / 100; | |
| 696 // P = (D1 * SENS / POW2_21 - OFF) / POW2_13; | |
| 697 temp = D1 * sens; | |
| 698 temp /= 2097152; | |
| 699 temp -= ms_off; | |
| 700 temp /= 8192; | |
| 701 ambient_pressure_decimbar = temp; // to float/double | |
| 702 ambient_pressure_mbar = ambient_pressure_decimbar / 10; | |
| 703 } | |
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704 */ |
| 38 | 705 |
| 706 | |
| 707 /* taken from AN520 by meas-spec.com dated 9. Aug. 2011 | |
| 708 * short and int are both 16bit according to AVR/GCC google results | |
| 709 */ | |
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710 static uint8_t crc4(uint16_t n_prom[]) |
| 38 | 711 { |
| 712 uint16_t cnt; // simple counter | |
| 713 uint16_t n_rem; // crc reminder | |
| 714 uint16_t crc_read; // original value of the crc | |
| 715 uint8_t n_bit; | |
| 716 n_rem = 0x00; | |
| 717 crc_read=n_prom[7]; //save read CRC | |
| 718 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0 | |
| 719 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes | |
| 720 { // choose LSB or MSB | |
| 721 if (cnt%2==1) n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF); | |
| 722 else n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8); | |
| 723 for (n_bit = 8; n_bit > 0; n_bit--) | |
| 724 { | |
| 725 if (n_rem & (0x8000)) | |
| 726 { | |
| 727 n_rem = (n_rem << 1) ^ 0x3000; | |
| 728 } | |
| 729 else | |
| 730 { | |
| 731 n_rem = (n_rem << 1); | |
| 732 } | |
| 733 } | |
| 734 } | |
| 735 n_rem= (0x000F & (n_rem >> 12)); // // final 4-bit reminder is CRC code | |
| 736 n_prom[7]=crc_read; // restore the crc_read to its original place | |
| 737 return (n_rem ^ 0x00); | |
| 738 } | |
| 739 /* | |
| 740 void test_calculation(void) | |
| 741 { | |
| 742 C1 = 29112; | |
| 743 C2 = 26814; | |
| 744 C3 = 19125; | |
| 745 C4 = 17865; | |
| 746 C5 = 32057; | |
| 747 C6 = 31305; | |
| 748 | |
| 749 C2_x_2p16 = C2 * 65536; | |
| 750 C1_x_2p15 = C1 * 32768; | |
| 751 | |
| 752 D1 = 4944364; | |
| 753 D2 = 8198974; | |
| 754 pressure_calculation() ; | |
| 755 }; | |
| 756 */ | |
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757 void pressure_set_offset (float pressureOffset, float temperatureOffset) |
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758 { |
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759 if(pressure_offset != pressureOffset) /* we received a new value => reinit surface que */ |
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760 { |
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761 ambient_pressure_mbar -= pressure_offset; /* revert old value */ |
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762 ambient_pressure_mbar += pressureOffset; /* apply new offset */ |
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763 init_surface_ring(1); |
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764 } |
| 38 | 765 |
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766 pressure_offset = pressureOffset; |
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767 temperature_offset = temperatureOffset; |
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768 } |
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769 |
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Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
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770 |