annotate Small_CPU/Src/pressure.c @ 402:44cb4e858643

Merged in Ideenmodellierer/ostc4/ImproveBluetooth (pull request #36) ImproveBluetooth
author heinrichsweikamp <bitbucket@heinrichsweikamp.com>
date Sun, 05 Jan 2020 14:57:50 +0000
parents cb3870f79e9d
children 6f30f2011667
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1 /**
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2 ******************************************************************************
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3 * @file pressure.c
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4 * @author heinrichs weikamp gmbh
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5 * @date 2014
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6 * @version V0.0.2
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7 * @since 20-Oct-2016
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8 * @brief
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9 *
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10 @verbatim
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11 ==============================================================================
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12 ##### How to use #####
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13 ==============================================================================
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14 V0.0.2 18-Oct-2016 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015
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15
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16 @endverbatim
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17 ******************************************************************************
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18 * @attention
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19 *
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20 * <h2><center>&copy; COPYRIGHT(c) 2016 heinrichs weikamp</center></h2>
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21 *
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22 ******************************************************************************
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23 */
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24
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27 /* surface time
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28 the last 30 minutes will be saved once per minute in a endless loop
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29 at the beginning of a dive the oldest value will be used
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30 */
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31 #include "math.h"
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32 #include "scheduler.h"
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33 #include "pressure.h"
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34 #include "i2c.h"
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35 #include "rtc.h"
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36
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37 #define CMD_RESET 0x1E // ADC reset command
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38 #define CMD_ADC_READ 0x00 // ADC read command
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39 #define CMD_ADC_CONV 0x40 // ADC conversion command
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40 #define CMD_ADC_D1 0x00 // ADC D1 conversion
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41 #define CMD_ADC_D2 0x10 // ADC D2 conversion
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42 #define CMD_ADC_256 0x00 // ADC OSR=256
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43 #define CMD_ADC_512 0x02 // ADC OSR=512
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44 #define CMD_ADC_1024 0x04 // ADC OSR=1024
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45 #define CMD_ADC_2048 0x06 // ADC OSR=2056
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46 #define CMD_ADC_4096 0x08 // ADC OSR=4096
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47 #define CMD_PROM_RD 0xA0 // Prom read command
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48
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49 /* remove comment to use a predefined profile for pressure changes instead of real world data */
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50 /* #define SIMULATE_PRESSURE */
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51
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52 #define PRESSURE_SURFACE_MAX_MBAR (1030.0f) /* It is unlikely that pressure at surface is greater than this value => clip to it */
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53 #define PRESSURE_HISTORY_SIZE (8u)
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54 #define PRESSURE_JUMP_VALID_MBAR (500.0f) /* values are measure several times a second => jumps > 5m very unlikely */
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56 #define PRESSURE_SURFACE_QUE (30u) /* history buffer [minutes] for past pressure measurements */
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57 #define PRESSURE_SURFACE_EVA_WINDOW (15u) /* Number of entries evaluated during instability test. Used to avoid detection while dive enters water */
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58 #define PRESSURE_SURFACE_STABLE_LIMIT (10u) /* Define pressure as stable if delta (mBar) is below this value */
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59 #define PRESSURE_SURFACE_DETECT_STABLE_CNT (5u) /* Event count to detect stable condition */
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60 #define PRESSURE_SURFACE_UNSTABLE_LIMIT (50u) /* Define pressure as not stable if delta (mBar) is larger than this value */
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61 #define PRESSURE_SURFACE_DETECT_UNSTABLE_CNT (3u) /* Event count to detect unstable condition */
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64 static uint8_t PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5803; /* Default Address */
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66 static uint16_t get_ci_by_coef_num(uint8_t coef_num);
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67 //void pressure_calculation_new(void);
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68 //void pressure_calculation_old(void);
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69 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void);
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70 //static uint8_t crc4(uint16_t n_prom[]);
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72 static HAL_StatusTypeDef pressure_sensor_get_data(void);
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73 static uint32_t get_adc(void);
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74 uint8_t pressureSensorInitSuccess = 0;
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76 static uint16_t C[8] = { 1 };
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77 static uint32_t D1 = 1;
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78 static uint32_t D2 = 1;
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79 //static uint8_t n_crc;
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81 static int64_t C5_x_2p8 = 1;
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82 static int64_t C2_x_2p16 = 1;
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83 static int64_t C1_x_2p15 = 1;
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84
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85 /*
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86 short C2plus10000 = -1;
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87 short C3plus200 = -1;
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88 short C4minus250 = -1;
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89 short UT1 = -1;
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90 short C6plus100 = -1;
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91 */
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92 static float pressure_offset = 0.0; /* Offset value which may be specified by the user via PC Software */
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93 static float temperature_offset = 0.0; /* Offset value which may be specified by the user via PC Software */
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94
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95 static float ambient_temperature = 0;
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96 static float ambient_pressure_mbar = 1000.0;
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97 static float surface_pressure_mbar = 1000.0;
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98 static float surface_ring_mbar[PRESSURE_SURFACE_QUE] = { 0 };
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100 static uint8_t surface_pressure_writeIndex = 0;
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101 static float surface_pressure_stable_value = 0;
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102 static uint8_t surface_pressure_stable = 0;
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103
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104 static float pressure_history_mbar[PRESSURE_HISTORY_SIZE];
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106 static uint8_t secondCounterSurfaceRing = 0;
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107 static uint8_t avgCount = 0;
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108 static float runningAvg = 0;
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109
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110 float get_temperature(void)
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111 {
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112 return ambient_temperature;
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113 }
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114
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115 float get_pressure_mbar(void)
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116 {
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117 return ambient_pressure_mbar;
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118 }
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119
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120 float get_surface_mbar(void)
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121 {
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122 return surface_pressure_mbar;
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123 }
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126 void init_surface_ring(uint8_t force)
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127 {
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128 if((surface_ring_mbar[0] == 0) || (force)) /* only initialize once. Keep value in place in case of an i2c recovery */
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129 {
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130 secondCounterSurfaceRing = 0; /* restart calculation */
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131 avgCount = 0;
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132 runningAvg = 0;
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133
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134 for(int i=0; i<PRESSURE_SURFACE_QUE; i++)
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135 surface_ring_mbar[i] = ambient_pressure_mbar;
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136 surface_pressure_mbar = ambient_pressure_mbar;
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137 surface_pressure_writeIndex = 0; /* index of the oldest value in the ring buffer */
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138 }
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139 }
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140
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141 void init_pressure_history(void)
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142 {
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143 for(int i=0; i<PRESSURE_HISTORY_SIZE; i++)
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144 {
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145 pressure_history_mbar[i] = 1000.0;
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146 }
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147 }
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149 uint8_t is_surface_pressure_stable(void)
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150 {
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151 return surface_pressure_stable;
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152 }
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153
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154 float set_last_surface_pressure_stable(void)
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155 {
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156 surface_pressure_mbar = surface_pressure_stable_value;
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157 return surface_pressure_stable_value;
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158 }
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159
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160 /* iterate backward through the history memory and evaluate the changes pressure changes during the last 30 minutes */
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161 void evaluate_surface_pressure()
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162 {
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163 uint8_t index;
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164 float lastvalue;
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165 uint8_t stablecnt = 0;
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166 uint8_t unstablecnt = 0;
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167 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 */
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168 uint8_t EvaluatedValues = 0;
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169
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170 lastvalue = surface_ring_mbar[surface_pressure_writeIndex];
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171 surface_pressure_stable_value = surface_ring_mbar[surface_pressure_writeIndex]; /* default: if no stable value is found return the oldest value */
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172 index = surface_pressure_writeIndex;
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173 surface_pressure_stable = 1;
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174
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175 if(index == 0)
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176 {
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177 index = PRESSURE_SURFACE_QUE - 1;
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178 }
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179 else
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180 {
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181 index = index - 1;
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182 }
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183 do
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184 {
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185 if((EvaluatedValues < EvaluationWindow) &&
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186 (fabs(surface_pressure_stable_value - surface_ring_mbar[index]) > PRESSURE_SURFACE_UNSTABLE_LIMIT)) /* unusual change during last 30 minutes */
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187 {
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188 unstablecnt++;
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189 if(unstablecnt > PRESSURE_SURFACE_DETECT_UNSTABLE_CNT)
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190 {
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191 surface_pressure_stable = 0;
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192 }
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193 }
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194 /* search for a value which does not change for several iterations */
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195 if (fabs(lastvalue - surface_ring_mbar[index]) < PRESSURE_SURFACE_STABLE_LIMIT)
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196 {
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197 stablecnt++;
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198 }
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199 else
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200 {
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201 stablecnt = 0;
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202 }
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203 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 */
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204 {
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205 surface_pressure_stable_value = surface_ring_mbar[index];
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206 unstablecnt = 0;
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207 }
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208
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209 lastvalue = surface_ring_mbar[index];
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210
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211 if(index == 0)
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212 {
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213 index = PRESSURE_SURFACE_QUE - 1;
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214 }
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215 else
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216 {
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217 index = index - 1;
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218 }
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219 EvaluatedValues++;
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220 } while (index != surface_pressure_writeIndex);
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221 }
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222 void update_surface_pressure(uint8_t call_rhythm_seconds)
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223 {
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224
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225
331
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226 if(is_init_pressure_done())
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227 {
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228 runningAvg = (runningAvg * avgCount + ambient_pressure_mbar) / (avgCount +1);
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229 avgCount++;
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230 secondCounterSurfaceRing += call_rhythm_seconds;
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231
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232 if(secondCounterSurfaceRing >= 60)
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233 {
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234 if(runningAvg < PRESSURE_SURFACE_MAX_MBAR)
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235 {
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236 surface_ring_mbar[surface_pressure_writeIndex] = runningAvg;
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237 }
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238 else
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239 {
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240 surface_ring_mbar[surface_pressure_writeIndex] = PRESSURE_SURFACE_MAX_MBAR;
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241 }
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242 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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243
352
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244 if(surface_pressure_writeIndex == PRESSURE_SURFACE_QUE)
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245 {
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246 surface_pressure_writeIndex = 0;
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247 }
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248
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249 surface_pressure_mbar = surface_ring_mbar[surface_pressure_writeIndex]; /* 30 minutes old measurement */
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250
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251 secondCounterSurfaceRing = 0;
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252 avgCount = 1; /* use the current value as starting point but restart the weight decrement of the measurements */
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253 }
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254 evaluate_surface_pressure();
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255 }
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256 }
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257
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258 #ifdef DEMOMODE
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259 float demo_modify_temperature_helper(float bottom_mbar_diff_to_surface)
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260 {
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261 const float temperature_surface = 31.0;
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262 const float temperature_bottom = 14.0;
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263
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264 const float temperature_difference = temperature_bottom - temperature_surface;
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265
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266 // range 0.0 - 1.0
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267 float position_now = (ambient_pressure_mbar - surface_pressure_mbar) / bottom_mbar_diff_to_surface;
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268
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269 if(position_now <= 0)
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270 return temperature_surface;
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271
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272 if(position_now >= 1)
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273 return temperature_bottom;
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274
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275 return temperature_surface + (temperature_difference * position_now);
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276 }
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277
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278
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279 uint32_t demo_modify_temperature_and_pressure(int32_t divetime_in_seconds, uint8_t subseconds, float ceiling_mbar)
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280 {
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281
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282 const float descent_rate = 4000/60;
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283 const float ascent_rate = 1000/60;
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284 const uint32_t seconds_descend = (1 * 60) + 30;
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285 const uint32_t turbo_seconds_at_bottom_start = (0 * 60) + 0;
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286 const uint32_t seconds_descend_and_bottomtime = seconds_descend + turbo_seconds_at_bottom_start + (2 * 60) + 0;
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287 uint32_t time_elapsed_in_seconds;
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288 static float ambient_pressure_mbar_memory = 0;
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289 static uint32_t time_last_call = 0;
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290
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291 if(divetime_in_seconds <= seconds_descend)
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292 {
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293 ambient_pressure_mbar = (divetime_in_seconds * descent_rate) + ((float)(subseconds) * descent_rate) + surface_pressure_mbar;
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294 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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295
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296 time_last_call = divetime_in_seconds;
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297 return 0;
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298 }
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299 else
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300 if(divetime_in_seconds <= seconds_descend + turbo_seconds_at_bottom_start)
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301 {
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302 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar;
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303 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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304 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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305 time_last_call = divetime_in_seconds;
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306 return turbo_seconds_at_bottom_start;
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307 }
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308 else
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309 if(divetime_in_seconds <= seconds_descend_and_bottomtime)
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310 {
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311 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar;
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312 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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313 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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314 time_last_call = divetime_in_seconds;
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315 return 0;
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316 }
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317 else
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318 {
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319 time_elapsed_in_seconds = divetime_in_seconds - time_last_call;
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320 ambient_pressure_mbar = ambient_pressure_mbar_memory - time_elapsed_in_seconds * ascent_rate;
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321
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322 if(ambient_pressure_mbar < surface_pressure_mbar)
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323 ambient_pressure_mbar = surface_pressure_mbar;
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324 else if(ambient_pressure_mbar < ceiling_mbar)
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325 ambient_pressure_mbar = ceiling_mbar;
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326
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327 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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328 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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329 time_last_call = divetime_in_seconds;
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330 return 0;
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331 }
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332 }
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333 #endif
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334
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335 uint8_t is_init_pressure_done(void)
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336 {
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337 return pressureSensorInitSuccess;
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338 }
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339
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340 uint8_t init_pressure(void)
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341 {
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342 uint8_t buffer[1];
356
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343 buffer[0] = 0x1E; // Reset Command
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344 uint8_t retValue = 0xFF;
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345
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346 pressureSensorInitSuccess = false;
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347 init_pressure_history();
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348
356
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349 /* Probe new sensor first */
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350 retValue = I2C_Master_Transmit( DEVICE_PRESSURE_MS5837, buffer, 1);
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351 if(retValue != HAL_OK)
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352 {
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353 PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5803; // use old sensor
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354 HAL_Delay(100);
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355 MX_I2C1_Init();
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356 if (global.I2C_SystemStatus != HAL_OK)
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357 {
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358 if (MX_I2C1_TestAndClear() == GPIO_PIN_RESET) {
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359 MX_I2C1_TestAndClear(); // do it a second time
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360 }
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361 MX_I2C1_Init();
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362 }
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363 }
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364 else
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365 {
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366 PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5837; // Success, use new sensor
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367 }
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368 HAL_Delay(3); //2.8ms according to datasheet
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369
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370 buffer[0] = 0x1E; // Reset Command
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371 retValue = 0xFF;
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372
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373 /* Send reset request to pressure sensor */
356
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374 retValue = I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1);
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375 if(retValue != HAL_OK)
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376 {
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377 return (HAL_StatusTypeDef)retValue;
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378 }
356
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379 HAL_Delay(3); //2.8ms according to datasheet
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380
356
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381 for(uint8_t i=0;i<7;i++)
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382 {
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383 C[i] = get_ci_by_coef_num(i);
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384 }
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385 // n_crc = crc4(C); // no evaluation at the moment hw 151026
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386
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387 C5_x_2p8 = C[5] * 256;
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388 C2_x_2p16 = C[2] * 65536;
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389 C1_x_2p15 = C[1] * 32768;
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390
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391 if(global.I2C_SystemStatus == HAL_OK)
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392 {
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393 pressureSensorInitSuccess = 1;
331
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394 retValue = pressure_update();
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395
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396 }
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397 return retValue;
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398 }
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399
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400
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401 static uint32_t get_adc(void)
38
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402 {
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403 uint8_t buffer[1];
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404 uint8_t resivebuf[4];
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405 uint32_t answer = 0;
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406
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407 buffer[0] = 0x00; // Get ADC
356
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408 I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1);
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409 I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 4);
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410 resivebuf[3] = 0;
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411 answer = 256*256 *(uint32_t)resivebuf[0] + 256 * (uint32_t)resivebuf[1] + (uint32_t)resivebuf[2];
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412
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413 return answer;
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414 }
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415
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416
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diff changeset
417 static uint16_t get_ci_by_coef_num(uint8_t coef_num)
38
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418 {
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419 uint8_t resivebuf[2];
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420
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421 uint8_t cmd = CMD_PROM_RD+coef_num*2;
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422 I2C_Master_Transmit( PRESSURE_ADDRESS, &cmd, 1);
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423 I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 2);
38
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424 return (256*(uint16_t)resivebuf[0]) + (uint16_t)resivebuf[1];
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425 }
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426
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427
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428
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429 uint8_t pressure_update(void)
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430 {
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431 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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432
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433 statusReturn = pressure_sensor_get_data();
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434 pressure_calculation();
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435 return (uint8_t)statusReturn;
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436 }
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437
276
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438 /* Switch between pressure and temperature measurement with every successful read operation */
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439 void pressure_update_alternating(void)
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440 {
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441 static uint8_t getTemperature= 0;
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442
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443 if(getTemperature)
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444 {
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445 if(pressure_sensor_get_temperature_raw() == HAL_OK)
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446 {
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447 getTemperature = 0;
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448 }
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449 }
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450 else
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451 {
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452 if(pressure_sensor_get_pressure_raw() == HAL_OK)
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453 {
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454 getTemperature = 1;
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455 }
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456 }
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457 pressure_calculation();
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458 return;
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459 }
38
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460
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diff changeset
461 static uint32_t pressure_sensor_get_one_value(uint8_t cmd, HAL_StatusTypeDef *statusReturn)
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462 {
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463 uint8_t command = CMD_ADC_CONV + cmd;
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464 HAL_StatusTypeDef statusReturnTemp = HAL_TIMEOUT;
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465
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466 statusReturnTemp = I2C_Master_Transmit( PRESSURE_ADDRESS, &command, 1);
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467
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468 if(statusReturn)
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469 {
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470 *statusReturn = statusReturnTemp;
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471 }
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472
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473 switch (cmd & 0x0f) // wait necessary conversion time
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474 {
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475 case CMD_ADC_256 : HAL_Delay(1); break;
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476 case CMD_ADC_512 : HAL_Delay(3); break;
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477 case CMD_ADC_1024: HAL_Delay(4); break;
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478 case CMD_ADC_2048: HAL_Delay(6); break;
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479 case CMD_ADC_4096: HAL_Delay(10); break;
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480 }
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481 return get_adc();
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482 }
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483
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484
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485 static HAL_StatusTypeDef pressure_sensor_get_data(void)
38
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486 {
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487 uint32_t requestedValue = 0;
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488 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT;
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489 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT;
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490
276
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491
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492
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493 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn2);
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494 if (statusReturn2 == HAL_OK)
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495 {
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496 D2 = requestedValue;
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497 }
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498
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499 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn1);
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500 if (statusReturn1 == HAL_OK)
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501 {
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502 D1 = requestedValue;
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503 }
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504 if(statusReturn2 > statusReturn1) // if anything is not HAL_OK (0x00) or worse
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505 return statusReturn2;
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506 else
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507 return statusReturn1;
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508 }
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509
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510
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511 HAL_StatusTypeDef pressure_sensor_get_pressure_raw(void)
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512 {
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513 uint32_t requestedValue = 0;
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514 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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515
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516 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn);
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517 if (statusReturn == HAL_OK)
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518 {
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519 D1 = requestedValue;
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520 }
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521
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522 return statusReturn;
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523 }
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524
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525
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526 HAL_StatusTypeDef pressure_sensor_get_temperature_raw(void)
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527 {
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528 uint32_t requestedValue = 0;
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529 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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530
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531 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn);
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532 if (statusReturn == HAL_OK)
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533 {
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534 D2 = requestedValue;
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535 }
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536 return statusReturn;
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537 }
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538
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539
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540 #ifdef SIMULATE_PRESSURE
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541 void pressure_simulation()
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542 {
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543 static uint32_t tickstart = 0;
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544 static float pressure_sim_mbar = 0;
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545 static uint32_t passedSecond = 0;
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546 static uint32_t secondtick = 0;
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547
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548 uint32_t lasttick = 0;
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549
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550
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551
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552 if( tickstart == 0)
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553 {
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554 tickstart = HAL_GetTick(); /* init time stamp */
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555 secondtick = tickstart;
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556 pressure_sim_mbar = 1000;
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557 }
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558
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559 lasttick = HAL_GetTick();
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560 if(time_elapsed_ms(secondtick,lasttick) > 1000) /* one second passed since last tick */
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561 {
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562 secondtick = lasttick;
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563 passedSecond++;
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564
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565 #ifdef DIVE_AFTER_LANDING
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566 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */
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567 else if(passedSecond < 300) pressure_sim_mbar -= 1.0; /* decrease pressure in 5 minutes target 770mbar => delta 330 */
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568 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay stable 10 minutes*/
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569 else if(passedSecond < 1500) pressure_sim_mbar += 0.5; /* return to 1 bar in 10 Minutes*/
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570 else if(passedSecond < 1800) pressure_sim_mbar += 0.0; /* 5 minutes break */
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571 else if(passedSecond < 2000) pressure_sim_mbar += 10.0; /* start dive */
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572 else if(passedSecond < 2300) pressure_sim_mbar += 0.0; /* stay on depth */
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573 else if(passedSecond < 2500) pressure_sim_mbar -= 10.0; /* return to surface */
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574 else pressure_sim_mbar = 1000.0; /* final state */
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575 #else /* short dive */
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576 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */
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577 else if(passedSecond < 180) pressure_sim_mbar += 10.0; /* Start dive */
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578 else if(passedSecond < 300) pressure_sim_mbar += 0.0; /*stay on depth*/
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579 else if(passedSecond < 460) pressure_sim_mbar -= 10.0; /* return to surface */
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580 else if(passedSecond < 600) pressure_sim_mbar += 0.0; /* stay */
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581 else if(passedSecond < 610) pressure_sim_mbar = 1000.0; /* get ready for second dive */
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diff changeset
582 else if(passedSecond < 780) pressure_sim_mbar += 10.0; /* Start dive */
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583 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay on depth*/
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diff changeset
584 else if(passedSecond < 1060) pressure_sim_mbar -= 10.0; /* return to surface */
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585 else if(passedSecond < 1200) pressure_sim_mbar += 0.0; /* stay */
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586 else pressure_sim_mbar = 1000.0; /* final state */
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587 #endif
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diff changeset
588 }
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diff changeset
589
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diff changeset
590
1f24022345d1 Fix merge problem
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591 ambient_pressure_mbar = pressure_sim_mbar;
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diff changeset
592 ambient_temperature = 25.0;
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diff changeset
593 return;
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diff changeset
594 }
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diff changeset
595
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diff changeset
596 #endif
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diff changeset
597
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598 void pressure_calculation(void)
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599 {
241
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600 if(global.I2C_SystemStatus != HAL_OK)
38
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601 return;
352
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diff changeset
602
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diff changeset
603 #ifdef SIMULATE_PRESSURE
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diff changeset
604 pressure_simulation();
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diff changeset
605 #else
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606 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015();
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607 #endif
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608 }
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609
331
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610 static uint8_t pressure_plausible(float pressurevalue)
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611 {
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diff changeset
612 static uint8_t pressurewriteindex = 0;
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613 uint8_t retval = 0;
b4c578caaafb Added plausibility check for pressure values
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614 uint8_t index;
b4c578caaafb Added plausibility check for pressure values
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615 float pressure_average = 0;
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diff changeset
616
b4c578caaafb Added plausibility check for pressure values
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diff changeset
617 for(index = 0; index < PRESSURE_HISTORY_SIZE; index++)
b4c578caaafb Added plausibility check for pressure values
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618 {
b4c578caaafb Added plausibility check for pressure values
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619 pressure_average += pressure_history_mbar[index];
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620 }
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621 pressure_average /= PRESSURE_HISTORY_SIZE;
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622 if(pressure_average == 1000.0) /* first pressure calculation */
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623 {
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
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diff changeset
624 if(fabs(pressurevalue - pressure_average) < 11000.0) /* just in case a reset occur during dive assume value equal < 100m as valid */
331
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625 {
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626 for(index = 0; index < PRESSURE_HISTORY_SIZE; index++)
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627 {
b4c578caaafb Added plausibility check for pressure values
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628 pressure_history_mbar[index] = pressurevalue; /* set history to current value */
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629 retval = 1;
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630 }
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631 }
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diff changeset
632 }
b4c578caaafb Added plausibility check for pressure values
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633 else
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634 {
b4c578caaafb Added plausibility check for pressure values
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635 if(fabs(pressurevalue - pressure_average) < PRESSURE_JUMP_VALID_MBAR)
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
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636 {
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637 pressure_history_mbar[pressurewriteindex++] = pressurevalue;
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638 pressurewriteindex &= 0x7; /* wrap around if necessary */
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
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639 retval = 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
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640 }
331
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641 }
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642
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643 return retval;
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644 }
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645
186
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646 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void)
38
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647 {
335
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648 static float runningAvg = 0;
c11ce8c885d3 Use average calculation for pressure: precondition was that pressure values jittered +- 10 HPa from one capture (once a second) to the other. Basically pressure is measured several times a second => using these values in an additional history calculation reduces the jitter down to +-1 per second
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649 static uint8_t avgCnt = 0;
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650
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651 uint32_t local_D1; // ADC value of the pressure conversion
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652 uint32_t local_D2; // ADC value of the temperature conversion
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653 int32_t local_Px10; // compensated pressure value
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654 int32_t local_Tx100; // compensated temperature value
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655 int64_t local_dT; // int32_t, difference between actual and measured temperature
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656 int64_t local_OFF; // offset at actual temperature
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657 int64_t local_SENS; // sensitivity at actual temperature
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658
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659 float calc_pressure;
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660
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661 int64_t T2;
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662 int64_t OFF2;
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663 int64_t SENS2;
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664
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665 local_D1 = D1;
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666 local_D2 = D2;
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667
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668 local_dT = ((int64_t)local_D2) - ((int64_t)C[5]) * 256; //pow(2,8);
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669 local_OFF = ((int64_t)C[2]) * 65536 + local_dT * ((int64_t)C[4]) / 128; // pow(2,16), pow(2,7)
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670 local_SENS = ((int64_t)C[1]) * 32768 + local_dT * ((int64_t)C[3]) / 256; // pow(2,15), pow(2,8)
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671
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672 local_Tx100 = (int32_t)(2000 + (local_dT * ((int64_t)C[6])) / 8388608);// pow(2,23)
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673
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674
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675 if(local_Tx100 < 2000) // low temperature
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676 {
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677 T2 = 3 * local_dT;
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678 T2 *= local_dT;
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679 T2 /= 8589934592;
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680
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681 OFF2 = ((int64_t)local_Tx100) - 2000;
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682 OFF2 *= OFF2;
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683 OFF2 *= 3;
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684 OFF2 /= 2;
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685
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686 SENS2 = ((int64_t)local_Tx100) - 2000;
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687 SENS2 *= SENS2;
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688 SENS2 *= 5;
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689 SENS2 /= 8;
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690
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691 local_Tx100 -= (int32_t)T2;
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692 local_OFF -= OFF2;
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693 local_SENS -= SENS2;
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694 }
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695 else
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696 {
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697 T2 = 7 * local_dT;
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698 T2 *= local_dT;
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699 T2 /= 137438953472;
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700
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701 OFF2 = ((int64_t)local_Tx100) - 2000;
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702 OFF2 *= OFF2;
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703 OFF2 /= 16;
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704
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705 local_Tx100 -= (int32_t)T2;
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706 local_OFF -= OFF2;
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707 }
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708
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709 local_Px10 = (int32_t)(
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710 (((int64_t)((local_D1 * local_SENS) / 2097152)) - local_OFF)
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711 / 8192 );// )) / 10; // pow(2,21), pow(2,13)
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712
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
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713 ambient_temperature = ((float)local_Tx100) / 100;
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
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714 ambient_temperature += temperature_offset;
331
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715
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716 calc_pressure = ((float)local_Px10) / 10;
339
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717 calc_pressure += pressure_offset;
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
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718
331
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719 if(pressure_plausible(calc_pressure))
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720 {
335
c11ce8c885d3 Use average calculation for pressure: precondition was that pressure values jittered +- 10 HPa from one capture (once a second) to the other. Basically pressure is measured several times a second => using these values in an additional history calculation reduces the jitter down to +-1 per second
ideenmodellierer
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721 runningAvg = (avgCnt * runningAvg + calc_pressure) / (avgCnt + 1);
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
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722 if (avgCnt < 10) /* build an average considering the last measurements to have a weight "1 of 10" */
335
c11ce8c885d3 Use average calculation for pressure: precondition was that pressure values jittered +- 10 HPa from one capture (once a second) to the other. Basically pressure is measured several times a second => using these values in an additional history calculation reduces the jitter down to +-1 per second
ideenmodellierer
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723 { /* Main reason for this is the jitter of up to +-10 HPa in surface mode which is caused */
c11ce8c885d3 Use average calculation for pressure: precondition was that pressure values jittered +- 10 HPa from one capture (once a second) to the other. Basically pressure is measured several times a second => using these values in an additional history calculation reduces the jitter down to +-1 per second
ideenmodellierer
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724 avgCnt++; /* by the measurement range of the sensor which is focused on under water pressure measurement */
c11ce8c885d3 Use average calculation for pressure: precondition was that pressure values jittered +- 10 HPa from one capture (once a second) to the other. Basically pressure is measured several times a second => using these values in an additional history calculation reduces the jitter down to +-1 per second
ideenmodellierer
parents: 331
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725 }
c11ce8c885d3 Use average calculation for pressure: precondition was that pressure values jittered +- 10 HPa from one capture (once a second) to the other. Basically pressure is measured several times a second => using these values in an additional history calculation reduces the jitter down to +-1 per second
ideenmodellierer
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diff changeset
726 ambient_pressure_mbar = runningAvg;
331
b4c578caaafb Added plausibility check for pressure values
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diff changeset
727 }
38
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728 }
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diff changeset
729
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730
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diff changeset
731 /* taken from AN520 by meas-spec.com dated 9. Aug. 2011
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732 * short and int are both 16bit according to AVR/GCC google results
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733 */
356
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734 /*static uint8_t crc4(uint16_t n_prom[])
38
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735 {
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736 uint16_t cnt; // simple counter
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737 uint16_t n_rem; // crc reminder
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738 uint16_t crc_read; // original value of the crc
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739 uint8_t n_bit;
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740 n_rem = 0x00;
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741 crc_read=n_prom[7]; //save read CRC
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742 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0
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743 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes
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744 { // choose LSB or MSB
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745 if (cnt%2==1) n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF);
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746 else n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8);
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747 for (n_bit = 8; n_bit > 0; n_bit--)
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748 {
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749 if (n_rem & (0x8000))
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750 {
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751 n_rem = (n_rem << 1) ^ 0x3000;
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752 }
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753 else
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754 {
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755 n_rem = (n_rem << 1);
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756 }
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757 }
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758 }
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759 n_rem= (0x000F & (n_rem >> 12)); // // final 4-bit reminder is CRC code
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760 n_prom[7]=crc_read; // restore the crc_read to its original place
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761 return (n_rem ^ 0x00);
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762 }
356
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diff changeset
763
38
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764 void test_calculation(void)
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765 {
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766 C1 = 29112;
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767 C2 = 26814;
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768 C3 = 19125;
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769 C4 = 17865;
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770 C5 = 32057;
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771 C6 = 31305;
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772
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773 C2_x_2p16 = C2 * 65536;
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774 C1_x_2p15 = C1 * 32768;
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775
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776 D1 = 4944364;
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777 D2 = 8198974;
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778 pressure_calculation() ;
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779 };
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780 */
339
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781 void pressure_set_offset (float pressureOffset, float temperatureOffset)
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782 {
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
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783 if(pressure_offset != pressureOffset) /* we received a new value => reinit surface que */
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
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784 {
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
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785 ambient_pressure_mbar -= pressure_offset; /* revert old value */
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
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diff changeset
786 ambient_pressure_mbar += pressureOffset; /* apply new offset */
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
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diff changeset
787 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
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diff changeset
788 }
38
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789
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
790 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
791 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
792 }
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
793
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
794