Mercurial > public > ostc4
annotate Small_CPU/Src/pressure.c @ 353:9c8e2e962f55 fix-merge-mess
Added tag v1.5.0 release for changeset 143fe85f82a2
Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>
| author | Jan Mulder <jlmulder@xs4all.nl> |
|---|---|
| date | Tue, 08 Oct 2019 16:41:57 +0200 |
| parents | 1f24022345d1 |
| children | cb3870f79e9d |
| rev | line source |
|---|---|
| 38 | 1 /** |
| 2 ****************************************************************************** | |
| 3 * @file pressure.c | |
| 4 * @author heinrichs weikamp gmbh | |
| 5 * @date 2014 | |
| 6 * @version V0.0.2 | |
| 7 * @since 20-Oct-2016 | |
| 8 * @brief | |
| 9 * | |
| 10 @verbatim | |
| 11 ============================================================================== | |
| 12 ##### How to use ##### | |
| 13 ============================================================================== | |
| 14 V0.0.2 18-Oct-2016 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015 | |
| 15 | |
| 16 @endverbatim | |
| 17 ****************************************************************************** | |
| 18 * @attention | |
| 19 * | |
| 20 * <h2><center>© COPYRIGHT(c) 2016 heinrichs weikamp</center></h2> | |
| 21 * | |
| 22 ****************************************************************************** | |
| 23 */ | |
| 24 | |
| 25 | |
| 26 | |
| 27 /* surface time | |
| 28 the last 30 minutes will be saved once per minute in a endless loop | |
| 29 at the beginning of a dive the oldest value will be used | |
| 30 */ | |
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31 #include "math.h" |
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32 #include "scheduler.h" |
| 38 | 33 #include "pressure.h" |
| 34 #include "i2c.h" | |
| 35 #include "rtc.h" | |
| 36 | |
| 37 #define CMD_RESET 0x1E // ADC reset command | |
| 38 #define CMD_ADC_READ 0x00 // ADC read command | |
| 39 #define CMD_ADC_CONV 0x40 // ADC conversion command | |
| 40 #define CMD_ADC_D1 0x00 // ADC D1 conversion | |
| 41 #define CMD_ADC_D2 0x10 // ADC D2 conversion | |
| 42 #define CMD_ADC_256 0x00 // ADC OSR=256 | |
| 43 #define CMD_ADC_512 0x02 // ADC OSR=512 | |
| 44 #define CMD_ADC_1024 0x04 // ADC OSR=1024 | |
| 45 #define CMD_ADC_2048 0x06 // ADC OSR=2056 | |
| 46 #define CMD_ADC_4096 0x08 // ADC OSR=4096 | |
| 47 #define CMD_PROM_RD 0xA0 // Prom read command | |
| 48 | |
| 352 | 49 /* remove comment to use a predefined profile for pressure changes instead of real world data */ |
| 50 /* #define SIMULATE_PRESSURE */ | |
| 51 | |
| 52 #define PRESSURE_SURFACE_MAX_MBAR (1030.0f) /* It is unlikely that pressure at surface is greater than this value => clip to it */ | |
| 53 #define PRESSURE_HISTORY_SIZE (8u) | |
| 54 #define PRESSURE_JUMP_VALID_MBAR (500.0f) /* values are measure several times a second => jumps > 5m very unlikely */ | |
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55 |
| 352 | 56 #define PRESSURE_SURFACE_QUE (30u) /* history buffer [minutes] for past pressure measurements */ |
| 57 #define PRESSURE_SURFACE_EVA_WINDOW (15u) /* Number of entries evaluated during instability test. Used to avoid detection while dive enters water */ | |
| 58 #define PRESSURE_SURFACE_STABLE_LIMIT (10u) /* Define pressure as stable if delta (mBar) is below this value */ | |
| 59 #define PRESSURE_SURFACE_DETECT_STABLE_CNT (5u) /* Event count to detect stable condition */ | |
| 60 #define PRESSURE_SURFACE_UNSTABLE_LIMIT (50u) /* Define pressure as not stable if delta (mBar) is larger than this value */ | |
| 61 #define PRESSURE_SURFACE_DETECT_UNSTABLE_CNT (3u) /* Event count to detect unstable condition */ | |
| 62 | |
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63 |
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64 static uint16_t get_ci_by_coef_num(uint8_t coef_num); |
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65 //void pressure_calculation_new(void); |
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66 //void pressure_calculation_old(void); |
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67 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void); |
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68 static uint8_t crc4(uint16_t n_prom[]); |
| 38 | 69 |
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70 static HAL_StatusTypeDef pressure_sensor_get_data(void); |
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71 static uint32_t get_adc(void); |
| 38 | 72 uint8_t pressureSensorInitSuccess = 0; |
| 73 | |
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74 static uint16_t C[8] = { 1 }; |
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75 static uint32_t D1 = 1; |
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76 static uint32_t D2 = 1; |
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77 static uint8_t n_crc; |
| 38 | 78 |
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79 static int64_t C5_x_2p8 = 1; |
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80 static int64_t C2_x_2p16 = 1; |
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81 static int64_t C1_x_2p15 = 1; |
| 38 | 82 |
| 83 /* | |
| 84 short C2plus10000 = -1; | |
| 85 short C3plus200 = -1; | |
| 86 short C4minus250 = -1; | |
| 87 short UT1 = -1; | |
| 88 short C6plus100 = -1; | |
| 89 */ | |
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90 static float pressure_offset = 0.0; /* Offset value which may be specified by the user via PC Software */ |
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91 static float temperature_offset = 0.0; /* Offset value which may be specified by the user via PC Software */ |
| 38 | 92 |
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93 static float ambient_temperature = 0; |
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94 static float ambient_pressure_mbar = 1000.0; |
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95 static float surface_pressure_mbar = 1000.0; |
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96 static float surface_ring_mbar[PRESSURE_SURFACE_QUE] = { 0 }; |
| 38 | 97 |
| 352 | 98 static uint8_t surface_pressure_writeIndex = 0; |
| 99 static float surface_pressure_stable_value = 0; | |
| 100 static uint8_t surface_pressure_stable = 0; | |
| 101 | |
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102 static float pressure_history_mbar[PRESSURE_HISTORY_SIZE]; |
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103 |
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104 static uint8_t secondCounterSurfaceRing = 0; |
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105 static uint8_t avgCount = 0; |
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106 static float runningAvg = 0; |
| 38 | 107 |
| 108 float get_temperature(void) | |
| 109 { | |
| 110 return ambient_temperature; | |
| 111 } | |
| 112 | |
| 113 float get_pressure_mbar(void) | |
| 114 { | |
| 115 return ambient_pressure_mbar; | |
| 116 } | |
| 117 | |
| 118 float get_surface_mbar(void) | |
| 119 { | |
| 120 return surface_pressure_mbar; | |
| 121 } | |
| 122 | |
| 123 | |
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124 void init_surface_ring(uint8_t force) |
| 38 | 125 { |
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126 if((surface_ring_mbar[0] == 0) || (force)) /* only initialize once. Keep value in place in case of an i2c recovery */ |
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127 { |
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128 secondCounterSurfaceRing = 0; /* restart calculation */ |
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129 avgCount = 0; |
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130 runningAvg = 0; |
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131 |
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132 for(int i=0; i<PRESSURE_SURFACE_QUE; i++) |
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133 surface_ring_mbar[i] = ambient_pressure_mbar; |
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134 surface_pressure_mbar = ambient_pressure_mbar; |
| 352 | 135 surface_pressure_writeIndex = 0; /* index of the oldest value in the ring buffer */ |
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136 } |
| 38 | 137 } |
| 138 | |
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139 void init_pressure_history(void) |
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140 { |
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141 for(int i=0; i<PRESSURE_HISTORY_SIZE; i++) |
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142 { |
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143 pressure_history_mbar[i] = 1000.0; |
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144 } |
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145 } |
| 38 | 146 |
| 352 | 147 uint8_t is_surface_pressure_stable(void) |
| 148 { | |
| 149 return surface_pressure_stable; | |
| 150 } | |
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151 |
| 352 | 152 float set_last_surface_pressure_stable(void) |
| 153 { | |
| 154 surface_pressure_mbar = surface_pressure_stable_value; | |
| 155 return surface_pressure_stable_value; | |
| 156 } | |
| 157 | |
| 158 /* iterate backward through the history memory and evaluate the changes pressure changes during the last 30 minutes */ | |
| 159 void evaluate_surface_pressure() | |
| 160 { | |
| 161 uint8_t index; | |
| 162 float lastvalue; | |
| 163 uint8_t stablecnt = 0; | |
| 164 uint8_t unstablecnt = 0; | |
| 165 uint8_t EvaluationWindow = PRESSURE_SURFACE_QUE - PRESSURE_SURFACE_EVA_WINDOW; /* do not use the latest 15 values to avoid unstable condition due to something like fin handling */ | |
| 166 uint8_t EvaluatedValues = 0; | |
| 167 | |
| 168 lastvalue = surface_ring_mbar[surface_pressure_writeIndex]; | |
| 169 surface_pressure_stable_value = surface_ring_mbar[surface_pressure_writeIndex]; /* default: if no stable value is found return the oldest value */ | |
| 170 index = surface_pressure_writeIndex; | |
| 171 surface_pressure_stable = 1; | |
| 172 | |
| 173 if(index == 0) | |
| 174 { | |
| 175 index = PRESSURE_SURFACE_QUE - 1; | |
| 176 } | |
| 177 else | |
| 178 { | |
| 179 index = index - 1; | |
| 180 } | |
| 181 do | |
| 182 { | |
| 183 if((EvaluatedValues < EvaluationWindow) && | |
| 184 (fabs(surface_pressure_stable_value - surface_ring_mbar[index]) > PRESSURE_SURFACE_UNSTABLE_LIMIT)) /* unusual change during last 30 minutes */ | |
| 185 { | |
| 186 unstablecnt++; | |
| 187 if(unstablecnt > PRESSURE_SURFACE_DETECT_UNSTABLE_CNT) | |
| 188 { | |
| 189 surface_pressure_stable = 0; | |
| 190 } | |
| 191 } | |
| 192 /* search for a value which does not change for several iterations */ | |
| 193 if (fabs(lastvalue - surface_ring_mbar[index]) < PRESSURE_SURFACE_STABLE_LIMIT) | |
| 194 { | |
| 195 stablecnt++; | |
| 196 } | |
| 197 else | |
| 198 { | |
| 199 stablecnt = 0; | |
| 200 } | |
| 201 if ((stablecnt >= PRESSURE_SURFACE_DETECT_STABLE_CNT) && (surface_pressure_stable == 0)&&(surface_pressure_stable_value == surface_ring_mbar[surface_pressure_writeIndex])) /* pressure is unstable => search for new stable value */ | |
| 202 { | |
| 203 surface_pressure_stable_value = surface_ring_mbar[index]; | |
| 204 unstablecnt = 0; | |
| 205 } | |
| 206 | |
| 207 lastvalue = surface_ring_mbar[index]; | |
| 208 | |
| 209 if(index == 0) | |
| 210 { | |
| 211 index = PRESSURE_SURFACE_QUE - 1; | |
| 212 } | |
| 213 else | |
| 214 { | |
| 215 index = index - 1; | |
| 216 } | |
| 217 EvaluatedValues++; | |
| 218 } while (index != surface_pressure_writeIndex); | |
| 219 } | |
| 38 | 220 void update_surface_pressure(uint8_t call_rhythm_seconds) |
| 221 { | |
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222 |
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223 |
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224 if(is_init_pressure_done()) |
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225 { |
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226 runningAvg = (runningAvg * avgCount + ambient_pressure_mbar) / (avgCount +1); |
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227 avgCount++; |
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228 secondCounterSurfaceRing += call_rhythm_seconds; |
| 38 | 229 |
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230 if(secondCounterSurfaceRing >= 60) |
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231 { |
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232 if(runningAvg < PRESSURE_SURFACE_MAX_MBAR) |
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233 { |
| 352 | 234 surface_ring_mbar[surface_pressure_writeIndex] = runningAvg; |
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235 } |
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236 else |
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237 { |
| 352 | 238 surface_ring_mbar[surface_pressure_writeIndex] = PRESSURE_SURFACE_MAX_MBAR; |
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239 } |
| 352 | 240 surface_pressure_writeIndex++; /* the write index is now pointing to the oldest value in the buffer which will be overwritten next time */ |
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241 |
| 352 | 242 if(surface_pressure_writeIndex == PRESSURE_SURFACE_QUE) |
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243 { |
| 352 | 244 surface_pressure_writeIndex = 0; |
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245 } |
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246 |
| 352 | 247 surface_pressure_mbar = surface_ring_mbar[surface_pressure_writeIndex]; /* 30 minutes old measurement */ |
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248 |
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249 secondCounterSurfaceRing = 0; |
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250 avgCount = 1; /* use the current value as starting point but restart the weight decrement of the measurements */ |
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251 } |
| 352 | 252 evaluate_surface_pressure(); |
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253 } |
| 38 | 254 } |
| 255 | |
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256 #ifdef DEMOMODE |
| 38 | 257 float demo_modify_temperature_helper(float bottom_mbar_diff_to_surface) |
| 258 { | |
| 259 const float temperature_surface = 31.0; | |
| 260 const float temperature_bottom = 14.0; | |
| 261 | |
| 262 const float temperature_difference = temperature_bottom - temperature_surface; | |
| 263 | |
| 264 // range 0.0 - 1.0 | |
| 265 float position_now = (ambient_pressure_mbar - surface_pressure_mbar) / bottom_mbar_diff_to_surface; | |
| 266 | |
| 267 if(position_now <= 0) | |
| 268 return temperature_surface; | |
| 269 | |
| 270 if(position_now >= 1) | |
| 271 return temperature_bottom; | |
| 272 | |
| 273 return temperature_surface + (temperature_difference * position_now); | |
| 274 } | |
| 275 | |
| 276 | |
| 277 uint32_t demo_modify_temperature_and_pressure(int32_t divetime_in_seconds, uint8_t subseconds, float ceiling_mbar) | |
| 278 { | |
| 279 | |
| 280 const float descent_rate = 4000/60; | |
| 281 const float ascent_rate = 1000/60; | |
| 282 const uint32_t seconds_descend = (1 * 60) + 30; | |
| 283 const uint32_t turbo_seconds_at_bottom_start = (0 * 60) + 0; | |
| 284 const uint32_t seconds_descend_and_bottomtime = seconds_descend + turbo_seconds_at_bottom_start + (2 * 60) + 0; | |
| 285 uint32_t time_elapsed_in_seconds; | |
| 286 static float ambient_pressure_mbar_memory = 0; | |
| 287 static uint32_t time_last_call = 0; | |
| 288 | |
| 289 if(divetime_in_seconds <= seconds_descend) | |
| 290 { | |
| 291 ambient_pressure_mbar = (divetime_in_seconds * descent_rate) + ((float)(subseconds) * descent_rate) + surface_pressure_mbar; | |
| 292 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 293 | |
| 294 time_last_call = divetime_in_seconds; | |
| 295 return 0; | |
| 296 } | |
| 297 else | |
| 298 if(divetime_in_seconds <= seconds_descend + turbo_seconds_at_bottom_start) | |
| 299 { | |
| 300 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar; | |
| 301 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 302 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 303 time_last_call = divetime_in_seconds; | |
| 304 return turbo_seconds_at_bottom_start; | |
| 305 } | |
| 306 else | |
| 307 if(divetime_in_seconds <= seconds_descend_and_bottomtime) | |
| 308 { | |
| 309 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar; | |
| 310 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 311 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 312 time_last_call = divetime_in_seconds; | |
| 313 return 0; | |
| 314 } | |
| 315 else | |
| 316 { | |
| 317 time_elapsed_in_seconds = divetime_in_seconds - time_last_call; | |
| 318 ambient_pressure_mbar = ambient_pressure_mbar_memory - time_elapsed_in_seconds * ascent_rate; | |
| 319 | |
| 320 if(ambient_pressure_mbar < surface_pressure_mbar) | |
| 321 ambient_pressure_mbar = surface_pressure_mbar; | |
| 322 else if(ambient_pressure_mbar < ceiling_mbar) | |
| 323 ambient_pressure_mbar = ceiling_mbar; | |
| 324 | |
| 325 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend); | |
| 326 ambient_pressure_mbar_memory = ambient_pressure_mbar; | |
| 327 time_last_call = divetime_in_seconds; | |
| 328 return 0; | |
| 329 } | |
| 330 } | |
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331 #endif |
| 38 | 332 |
| 333 uint8_t is_init_pressure_done(void) | |
| 334 { | |
| 335 return pressureSensorInitSuccess; | |
| 336 } | |
| 337 | |
| 338 uint8_t init_pressure(void) | |
| 339 { | |
| 340 uint8_t buffer[1]; | |
| 341 buffer[0] = 0x1e; | |
| 342 uint8_t retValue = 0xFF; | |
| 343 | |
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344 pressureSensorInitSuccess = false; |
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345 init_pressure_history(); |
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346 |
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347 /* Send reset request to pressure sensor */ |
| 38 | 348 retValue = I2C_Master_Transmit( DEVICE_PRESSURE, buffer, 1); |
| 349 if(retValue != HAL_OK) | |
| 350 { | |
| 351 return (HAL_StatusTypeDef)retValue; | |
| 352 } | |
| 353 HAL_Delay(3); | |
| 354 | |
| 355 for(uint8_t i=0;i<8;i++) | |
| 356 { | |
| 357 C[i] = get_ci_by_coef_num(i); | |
| 358 } | |
| 359 n_crc = crc4(C); // no evaluation at the moment hw 151026 | |
| 360 | |
| 361 C5_x_2p8 = C[5] * 256; | |
| 362 C2_x_2p16 = C[2] * 65536; | |
| 363 C1_x_2p15 = C[1] * 32768; | |
| 364 | |
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365 if(global.I2C_SystemStatus == HAL_OK) |
| 38 | 366 { |
| 367 pressureSensorInitSuccess = 1; | |
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368 retValue = pressure_update(); |
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369 |
| 38 | 370 } |
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371 return retValue; |
| 38 | 372 } |
| 373 | |
| 374 | |
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375 static uint32_t get_adc(void) |
| 38 | 376 { |
| 377 uint8_t buffer[1]; | |
| 378 uint8_t resivebuf[4]; | |
| 379 uint32_t answer = 0; | |
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380 |
| 38 | 381 buffer[0] = 0x00; // Get ADC |
| 382 I2C_Master_Transmit( DEVICE_PRESSURE, buffer, 1); | |
| 383 I2C_Master_Receive( DEVICE_PRESSURE, resivebuf, 4); | |
| 384 resivebuf[3] = 0; | |
| 385 answer = 256*256 *(uint32_t)resivebuf[0] + 256 * (uint32_t)resivebuf[1] + (uint32_t)resivebuf[2]; | |
| 386 | |
| 387 return answer; | |
| 388 } | |
| 389 | |
| 390 | |
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391 static uint16_t get_ci_by_coef_num(uint8_t coef_num) |
| 38 | 392 { |
| 393 uint8_t resivebuf[2]; | |
| 394 | |
| 395 uint8_t cmd = CMD_PROM_RD+coef_num*2; | |
| 396 I2C_Master_Transmit( DEVICE_PRESSURE, &cmd, 1); | |
| 397 I2C_Master_Receive( DEVICE_PRESSURE, resivebuf, 2); | |
| 398 return (256*(uint16_t)resivebuf[0]) + (uint16_t)resivebuf[1]; | |
| 399 } | |
| 400 | |
| 401 | |
| 402 | |
| 403 uint8_t pressure_update(void) | |
| 404 { | |
| 405 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; | |
| 406 | |
| 407 statusReturn = pressure_sensor_get_data(); | |
| 408 pressure_calculation(); | |
| 409 return (uint8_t)statusReturn; | |
| 410 } | |
| 411 | |
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412 /* Switch between pressure and temperature measurement with every successful read operation */ |
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413 void pressure_update_alternating(void) |
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414 { |
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415 static uint8_t getTemperature= 0; |
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416 |
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417 if(getTemperature) |
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418 { |
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419 if(pressure_sensor_get_temperature_raw() == HAL_OK) |
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420 { |
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421 getTemperature = 0; |
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422 } |
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423 } |
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424 else |
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425 { |
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426 if(pressure_sensor_get_pressure_raw() == HAL_OK) |
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427 { |
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428 getTemperature = 1; |
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429 } |
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430 } |
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431 pressure_calculation(); |
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432 return; |
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433 } |
| 38 | 434 |
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435 static uint32_t pressure_sensor_get_one_value(uint8_t cmd, HAL_StatusTypeDef *statusReturn) |
| 38 | 436 { |
| 437 uint8_t command = CMD_ADC_CONV + cmd; | |
| 438 HAL_StatusTypeDef statusReturnTemp = HAL_TIMEOUT; | |
| 439 | |
| 440 statusReturnTemp = I2C_Master_Transmit( DEVICE_PRESSURE, &command, 1); | |
| 441 | |
| 442 if(statusReturn) | |
| 443 { | |
| 444 *statusReturn = statusReturnTemp; | |
| 445 } | |
| 446 | |
| 447 switch (cmd & 0x0f) // wait necessary conversion time | |
| 448 { | |
| 449 case CMD_ADC_256 : HAL_Delay(1); break; | |
| 450 case CMD_ADC_512 : HAL_Delay(3); break; | |
| 451 case CMD_ADC_1024: HAL_Delay(4); break; | |
| 452 case CMD_ADC_2048: HAL_Delay(6); break; | |
| 453 case CMD_ADC_4096: HAL_Delay(10); break; | |
| 454 } | |
| 455 return get_adc(); | |
| 456 } | |
| 457 | |
| 458 | |
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459 static HAL_StatusTypeDef pressure_sensor_get_data(void) |
| 38 | 460 { |
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461 uint32_t requestedValue = 0; |
| 38 | 462 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT; |
| 463 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT; | |
| 464 | |
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465 |
| 38 | 466 |
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467 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn2); |
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468 if (statusReturn2 == HAL_OK) |
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469 { |
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470 D2 = requestedValue; |
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471 } |
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472 |
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473 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn1); |
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474 if (statusReturn1 == HAL_OK) |
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475 { |
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476 D1 = requestedValue; |
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477 } |
| 38 | 478 if(statusReturn2 > statusReturn1) // if anything is not HAL_OK (0x00) or worse |
| 479 return statusReturn2; | |
| 480 else | |
| 481 return statusReturn1; | |
| 482 } | |
| 483 | |
| 484 | |
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485 HAL_StatusTypeDef pressure_sensor_get_pressure_raw(void) |
| 38 | 486 { |
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487 uint32_t requestedValue = 0; |
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488 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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489 |
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490 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn); |
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491 if (statusReturn == HAL_OK) |
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492 { |
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493 D1 = requestedValue; |
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494 } |
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495 |
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496 return statusReturn; |
| 38 | 497 } |
| 498 | |
| 499 | |
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500 HAL_StatusTypeDef pressure_sensor_get_temperature_raw(void) |
| 38 | 501 { |
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502 uint32_t requestedValue = 0; |
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503 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT; |
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504 |
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505 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn); |
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506 if (statusReturn == HAL_OK) |
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507 { |
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508 D2 = requestedValue; |
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509 } |
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510 return statusReturn; |
| 38 | 511 } |
| 512 | |
| 513 | |
| 352 | 514 #ifdef SIMULATE_PRESSURE |
| 515 void pressure_simulation() | |
| 516 { | |
| 517 static uint32_t tickstart = 0; | |
| 518 static float pressure_sim_mbar = 0; | |
| 519 static uint32_t passedSecond = 0; | |
| 520 static uint32_t secondtick = 0; | |
| 521 | |
| 522 uint32_t lasttick = 0; | |
| 523 | |
| 524 | |
| 525 | |
| 526 if( tickstart == 0) | |
| 527 { | |
| 528 tickstart = HAL_GetTick(); /* init time stamp */ | |
| 529 secondtick = tickstart; | |
| 530 pressure_sim_mbar = 1000; | |
| 531 } | |
| 532 | |
| 533 lasttick = HAL_GetTick(); | |
| 534 if(time_elapsed_ms(secondtick,lasttick) > 1000) /* one second passed since last tick */ | |
| 535 { | |
| 536 secondtick = lasttick; | |
| 537 passedSecond++; | |
| 538 | |
| 539 #ifdef DIVE_AFTER_LANDING | |
| 540 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */ | |
| 541 else if(passedSecond < 300) pressure_sim_mbar -= 1.0; /* decrease pressure in 5 minutes target 770mbar => delta 330 */ | |
| 542 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay stable 10 minutes*/ | |
| 543 else if(passedSecond < 1500) pressure_sim_mbar += 0.5; /* return to 1 bar in 10 Minutes*/ | |
| 544 else if(passedSecond < 1800) pressure_sim_mbar += 0.0; /* 5 minutes break */ | |
| 545 else if(passedSecond < 2000) pressure_sim_mbar += 10.0; /* start dive */ | |
| 546 else if(passedSecond < 2300) pressure_sim_mbar += 0.0; /* stay on depth */ | |
| 547 else if(passedSecond < 2500) pressure_sim_mbar -= 10.0; /* return to surface */ | |
| 548 else pressure_sim_mbar = 1000.0; /* final state */ | |
| 549 #else /* short dive */ | |
| 550 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */ | |
| 551 else if(passedSecond < 180) pressure_sim_mbar += 10.0; /* Start dive */ | |
| 552 else if(passedSecond < 300) pressure_sim_mbar += 0.0; /*stay on depth*/ | |
| 553 else if(passedSecond < 460) pressure_sim_mbar -= 10.0; /* return to surface */ | |
| 554 else if(passedSecond < 600) pressure_sim_mbar += 0.0; /* stay */ | |
| 555 else if(passedSecond < 610) pressure_sim_mbar = 1000.0; /* get ready for second dive */ | |
| 556 else if(passedSecond < 780) pressure_sim_mbar += 10.0; /* Start dive */ | |
| 557 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay on depth*/ | |
| 558 else if(passedSecond < 1060) pressure_sim_mbar -= 10.0; /* return to surface */ | |
| 559 else if(passedSecond < 1200) pressure_sim_mbar += 0.0; /* stay */ | |
| 560 else pressure_sim_mbar = 1000.0; /* final state */ | |
| 561 #endif | |
| 562 } | |
| 563 | |
| 564 | |
| 565 ambient_pressure_mbar = pressure_sim_mbar; | |
| 566 ambient_temperature = 25.0; | |
| 567 return; | |
| 568 } | |
| 569 | |
| 570 #endif | |
| 571 | |
| 38 | 572 void pressure_calculation(void) |
| 573 { | |
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574 if(global.I2C_SystemStatus != HAL_OK) |
| 38 | 575 return; |
| 352 | 576 |
| 577 #ifdef SIMULATE_PRESSURE | |
| 578 pressure_simulation(); | |
| 579 #else | |
| 38 | 580 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(); |
| 352 | 581 #endif |
| 38 | 582 } |
| 583 | |
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584 static uint8_t pressure_plausible(float pressurevalue) |
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585 { |
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586 static uint8_t pressurewriteindex = 0; |
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587 uint8_t retval = 0; |
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588 uint8_t index; |
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589 float pressure_average = 0; |
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590 |
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591 for(index = 0; index < PRESSURE_HISTORY_SIZE; index++) |
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592 { |
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593 pressure_average += pressure_history_mbar[index]; |
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594 } |
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595 pressure_average /= PRESSURE_HISTORY_SIZE; |
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596 if(pressure_average == 1000.0) /* first pressure calculation */ |
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597 { |
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598 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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599 { |
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600 for(index = 0; index < PRESSURE_HISTORY_SIZE; index++) |
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601 { |
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602 pressure_history_mbar[index] = pressurevalue; /* set history to current value */ |
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603 retval = 1; |
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604 } |
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605 } |
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606 } |
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607 else |
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608 { |
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609 if(fabs(pressurevalue - pressure_average) < PRESSURE_JUMP_VALID_MBAR) |
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610 { |
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611 pressure_history_mbar[pressurewriteindex++] = pressurevalue; |
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612 pressurewriteindex &= 0x7; /* wrap around if necessary */ |
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613 retval = 1; |
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614 } |
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615 } |
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616 |
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617 return retval; |
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618 } |
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619 |
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620 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void) |
| 38 | 621 { |
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622 static float runningAvg = 0; |
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623 static uint8_t avgCnt = 0; |
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624 |
| 38 | 625 uint32_t local_D1; // ADC value of the pressure conversion |
| 626 uint32_t local_D2; // ADC value of the temperature conversion | |
| 627 int32_t local_Px10; // compensated pressure value | |
| 628 int32_t local_Tx100; // compensated temperature value | |
| 629 int64_t local_dT; // int32_t, difference between actual and measured temperature | |
| 630 int64_t local_OFF; // offset at actual temperature | |
| 631 int64_t local_SENS; // sensitivity at actual temperature | |
| 632 | |
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633 float calc_pressure; |
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634 |
| 38 | 635 int64_t T2; |
| 636 int64_t OFF2; | |
| 637 int64_t SENS2; | |
| 638 | |
| 639 local_D1 = D1; | |
| 640 local_D2 = D2; | |
| 641 | |
| 642 local_dT = ((int64_t)local_D2) - ((int64_t)C[5]) * 256; //pow(2,8); | |
| 643 local_OFF = ((int64_t)C[2]) * 65536 + local_dT * ((int64_t)C[4]) / 128; // pow(2,16), pow(2,7) | |
| 644 local_SENS = ((int64_t)C[1]) * 32768 + local_dT * ((int64_t)C[3]) / 256; // pow(2,15), pow(2,8) | |
| 645 | |
| 646 local_Tx100 = (int32_t)(2000 + (local_dT * ((int64_t)C[6])) / 8388608);// pow(2,23) | |
| 647 | |
| 648 | |
| 649 if(local_Tx100 < 2000) // low temperature | |
| 650 { | |
| 651 T2 = 3 * local_dT; | |
| 652 T2 *= local_dT; | |
| 653 T2 /= 8589934592; | |
| 654 | |
| 655 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 656 OFF2 *= OFF2; | |
| 657 OFF2 *= 3; | |
| 658 OFF2 /= 2; | |
| 659 | |
| 660 SENS2 = ((int64_t)local_Tx100) - 2000; | |
| 661 SENS2 *= SENS2; | |
| 662 SENS2 *= 5; | |
| 663 SENS2 /= 8; | |
| 664 | |
| 665 local_Tx100 -= (int32_t)T2; | |
| 666 local_OFF -= OFF2; | |
| 667 local_SENS -= SENS2; | |
| 668 } | |
| 669 else | |
| 670 { | |
| 671 T2 = 7 * local_dT; | |
| 672 T2 *= local_dT; | |
| 673 T2 /= 137438953472; | |
| 674 | |
| 675 OFF2 = ((int64_t)local_Tx100) - 2000; | |
| 676 OFF2 *= OFF2; | |
| 677 OFF2 /= 16; | |
| 678 | |
| 679 local_Tx100 -= (int32_t)T2; | |
| 680 local_OFF -= OFF2; | |
| 681 } | |
| 682 | |
| 683 local_Px10 = (int32_t)( | |
| 684 (((int64_t)((local_D1 * local_SENS) / 2097152)) - local_OFF) | |
| 685 / 8192 );// )) / 10; // pow(2,21), pow(2,13) | |
| 686 | |
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687 ambient_temperature = ((float)local_Tx100) / 100; |
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688 ambient_temperature += temperature_offset; |
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689 |
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690 calc_pressure = ((float)local_Px10) / 10; |
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691 calc_pressure += pressure_offset; |
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692 |
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693 if(pressure_plausible(calc_pressure)) |
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694 { |
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695 runningAvg = (avgCnt * runningAvg + calc_pressure) / (avgCnt + 1); |
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696 if (avgCnt < 10) /* build an average considering the last measurements to have a weight "1 of 10" */ |
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697 { /* Main reason for this is the jitter of up to +-10 HPa in surface mode which is caused */ |
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698 avgCnt++; /* by the measurement range of the sensor which is focused on under water pressure measurement */ |
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699 } |
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700 ambient_pressure_mbar = runningAvg; |
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701 } |
| 38 | 702 } |
| 703 | |
| 704 | |
| 705 /* taken from AN520 by meas-spec.com dated 9. Aug. 2011 | |
| 706 * short and int are both 16bit according to AVR/GCC google results | |
| 707 */ | |
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708 static uint8_t crc4(uint16_t n_prom[]) |
| 38 | 709 { |
| 710 uint16_t cnt; // simple counter | |
| 711 uint16_t n_rem; // crc reminder | |
| 712 uint16_t crc_read; // original value of the crc | |
| 713 uint8_t n_bit; | |
| 714 n_rem = 0x00; | |
| 715 crc_read=n_prom[7]; //save read CRC | |
| 716 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0 | |
| 717 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes | |
| 718 { // choose LSB or MSB | |
| 719 if (cnt%2==1) n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF); | |
| 720 else n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8); | |
| 721 for (n_bit = 8; n_bit > 0; n_bit--) | |
| 722 { | |
| 723 if (n_rem & (0x8000)) | |
| 724 { | |
| 725 n_rem = (n_rem << 1) ^ 0x3000; | |
| 726 } | |
| 727 else | |
| 728 { | |
| 729 n_rem = (n_rem << 1); | |
| 730 } | |
| 731 } | |
| 732 } | |
| 733 n_rem= (0x000F & (n_rem >> 12)); // // final 4-bit reminder is CRC code | |
| 734 n_prom[7]=crc_read; // restore the crc_read to its original place | |
| 735 return (n_rem ^ 0x00); | |
| 736 } | |
| 737 /* | |
| 738 void test_calculation(void) | |
| 739 { | |
| 740 C1 = 29112; | |
| 741 C2 = 26814; | |
| 742 C3 = 19125; | |
| 743 C4 = 17865; | |
| 744 C5 = 32057; | |
| 745 C6 = 31305; | |
| 746 | |
| 747 C2_x_2p16 = C2 * 65536; | |
| 748 C1_x_2p15 = C1 * 32768; | |
| 749 | |
| 750 D1 = 4944364; | |
| 751 D2 = 8198974; | |
| 752 pressure_calculation() ; | |
| 753 }; | |
| 754 */ | |
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755 void pressure_set_offset (float pressureOffset, float temperatureOffset) |
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756 { |
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757 if(pressure_offset != pressureOffset) /* we received a new value => reinit surface que */ |
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758 { |
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759 ambient_pressure_mbar -= pressure_offset; /* revert old value */ |
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760 ambient_pressure_mbar += pressureOffset; /* apply new offset */ |
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761 init_surface_ring(1); |
|
37f45300bc2e
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
ideenmodellierer
parents:
335
diff
changeset
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762 } |
| 38 | 763 |
|
339
37f45300bc2e
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
ideenmodellierer
parents:
335
diff
changeset
|
764 pressure_offset = pressureOffset; |
|
37f45300bc2e
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
ideenmodellierer
parents:
335
diff
changeset
|
765 temperature_offset = temperatureOffset; |
|
37f45300bc2e
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
ideenmodellierer
parents:
335
diff
changeset
|
766 } |
|
37f45300bc2e
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
ideenmodellierer
parents:
335
diff
changeset
|
767 |
|
37f45300bc2e
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
ideenmodellierer
parents:
335
diff
changeset
|
768 |