annotate Small_CPU/Src/pressure.c @ 461:b3f684cea9c0

Merged in Ideenmodellierer/ostc4/minor_improvments (pull request #41) Minor improvments
author heinrichsweikamp <bitbucket@heinrichsweikamp.com>
date Mon, 30 Mar 2020 13:16:11 +0000
parents 6f30f2011667
children 4be72d55b09a
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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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55 #define PRESSURE_SURFACE_QUE (30u) /* history buffer [minutes] for past pressure measurements */
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56 #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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57 #define PRESSURE_SURFACE_STABLE_LIMIT (10u) /* Define pressure as stable if delta (mBar) is below this value */
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58 #define PRESSURE_SURFACE_DETECT_STABLE_CNT (5u) /* Event count to detect stable condition */
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59 #define PRESSURE_SURFACE_UNSTABLE_LIMIT (50u) /* Define pressure as not stable if delta (mBar) is larger than this value */
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60 #define PRESSURE_SURFACE_DETECT_UNSTABLE_CNT (3u) /* Event count to detect unstable condition */
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63 static uint8_t PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5803; /* Default Address */
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65 static uint16_t get_ci_by_coef_num(uint8_t coef_num);
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66 //void pressure_calculation_new(void);
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67 //void pressure_calculation_old(void);
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68 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void);
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69 //static uint8_t crc4(uint16_t n_prom[]);
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71 static HAL_StatusTypeDef pressure_sensor_get_data(void);
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72 static uint32_t get_adc(void);
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73 uint8_t pressureSensorInitSuccess = 0;
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75 static uint16_t C[8] = { 1 };
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76 static uint32_t D1 = 1;
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77 static uint32_t D2 = 1;
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78 //static uint8_t n_crc;
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80 static int64_t C5_x_2p8 = 1;
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81 static int64_t C2_x_2p16 = 1;
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82 static int64_t C1_x_2p15 = 1;
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83
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84 /*
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85 short C2plus10000 = -1;
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86 short C3plus200 = -1;
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87 short C4minus250 = -1;
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88 short UT1 = -1;
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89 short C6plus100 = -1;
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90 */
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91 static float pressure_offset = 0.0; /* Offset value which may be specified by the user via PC Software */
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92 static float temperature_offset = 0.0; /* Offset value which may be specified by the user via PC Software */
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93
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94 static float ambient_temperature = 0;
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95 static float ambient_pressure_mbar = 1000.0;
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96 static float surface_pressure_mbar = 1000.0;
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97 static float surface_ring_mbar[PRESSURE_SURFACE_QUE] = { 0 };
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98
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99 static uint8_t surface_pressure_writeIndex = 0;
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100 static float surface_pressure_stable_value = 0;
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101 static uint8_t surface_pressure_stable = 0;
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102
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103 static float pressure_history_mbar[PRESSURE_HISTORY_SIZE];
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105 static uint8_t secondCounterSurfaceRing = 0;
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106 static uint8_t avgCount = 0;
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107 static float runningAvg = 0;
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108
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109 float get_temperature(void)
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110 {
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111 return ambient_temperature;
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112 }
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113
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114 float get_pressure_mbar(void)
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115 {
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116 return ambient_pressure_mbar;
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117 }
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118
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119 float get_surface_mbar(void)
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120 {
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121 return surface_pressure_mbar;
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122 }
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123
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124
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125 void init_surface_ring(uint8_t force)
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126 {
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127 if((surface_ring_mbar[0] == 0) || (force)) /* only initialize once. Keep value in place in case of an i2c recovery */
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128 {
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129 secondCounterSurfaceRing = 0; /* restart calculation */
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130 avgCount = 0;
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131 runningAvg = 0;
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132
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133 for(int i=0; i<PRESSURE_SURFACE_QUE; i++)
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134 surface_ring_mbar[i] = ambient_pressure_mbar;
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135 surface_pressure_mbar = ambient_pressure_mbar;
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136 surface_pressure_writeIndex = 0; /* index of the oldest value in the ring buffer */
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137 }
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138 }
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139
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140 void init_pressure_history(void)
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141 {
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142 for(int i=0; i<PRESSURE_HISTORY_SIZE; i++)
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143 {
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144 pressure_history_mbar[i] = 1000.0;
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145 }
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146 }
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147
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148 uint8_t is_surface_pressure_stable(void)
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149 {
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150 return surface_pressure_stable;
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151 }
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152
352
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153 float set_last_surface_pressure_stable(void)
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154 {
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155 surface_pressure_mbar = surface_pressure_stable_value;
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156 return surface_pressure_stable_value;
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157 }
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158
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159 /* iterate backward through the history memory and evaluate the changes pressure changes during the last 30 minutes */
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160 void evaluate_surface_pressure()
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161 {
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162 uint8_t index;
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163 float lastvalue;
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164 uint8_t stablecnt = 0;
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165 uint8_t unstablecnt = 0;
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166 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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167 uint8_t EvaluatedValues = 0;
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168
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169 lastvalue = surface_ring_mbar[surface_pressure_writeIndex];
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170 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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171 index = surface_pressure_writeIndex;
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172 surface_pressure_stable = 1;
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173
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174 if(index == 0)
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175 {
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176 index = PRESSURE_SURFACE_QUE - 1;
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177 }
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178 else
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179 {
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180 index = index - 1;
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181 }
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182 do
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183 {
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184 if((EvaluatedValues < EvaluationWindow) &&
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185 (fabs(surface_pressure_stable_value - surface_ring_mbar[index]) > PRESSURE_SURFACE_UNSTABLE_LIMIT)) /* unusual change during last 30 minutes */
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186 {
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187 unstablecnt++;
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188 if(unstablecnt > PRESSURE_SURFACE_DETECT_UNSTABLE_CNT)
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189 {
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190 surface_pressure_stable = 0;
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191 }
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192 }
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193 /* search for a value which does not change for several iterations */
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194 if (fabs(lastvalue - surface_ring_mbar[index]) < PRESSURE_SURFACE_STABLE_LIMIT)
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195 {
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196 stablecnt++;
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197 }
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198 else
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199 {
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200 stablecnt = 0;
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201 }
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202 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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203 {
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204 surface_pressure_stable_value = surface_ring_mbar[index];
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205 unstablecnt = 0;
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206 }
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207
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208 lastvalue = surface_ring_mbar[index];
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209
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210 if(index == 0)
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211 {
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212 index = PRESSURE_SURFACE_QUE - 1;
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213 }
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214 else
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215 {
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216 index = index - 1;
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217 }
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218 EvaluatedValues++;
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219 } while (index != surface_pressure_writeIndex);
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220 }
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221 void update_surface_pressure(uint8_t call_rhythm_seconds)
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222 {
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223
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224
331
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225 if(is_init_pressure_done())
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226 {
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227 runningAvg = (runningAvg * avgCount + ambient_pressure_mbar) / (avgCount +1);
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228 avgCount++;
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229 secondCounterSurfaceRing += call_rhythm_seconds;
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230
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231 if(secondCounterSurfaceRing >= 60)
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232 {
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233 if(runningAvg < PRESSURE_SURFACE_MAX_MBAR)
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234 {
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235 surface_ring_mbar[surface_pressure_writeIndex] = runningAvg;
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236 }
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237 else
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238 {
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239 surface_ring_mbar[surface_pressure_writeIndex] = PRESSURE_SURFACE_MAX_MBAR;
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240 }
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241 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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242
352
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243 if(surface_pressure_writeIndex == PRESSURE_SURFACE_QUE)
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244 {
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245 surface_pressure_writeIndex = 0;
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246 }
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247
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248 surface_pressure_mbar = surface_ring_mbar[surface_pressure_writeIndex]; /* 30 minutes old measurement */
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249
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250 secondCounterSurfaceRing = 0;
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251 avgCount = 1; /* use the current value as starting point but restart the weight decrement of the measurements */
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252 }
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253 evaluate_surface_pressure();
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254 }
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255 }
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256
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257 #ifdef DEMOMODE
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258 float demo_modify_temperature_helper(float bottom_mbar_diff_to_surface)
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259 {
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260 const float temperature_surface = 31.0;
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261 const float temperature_bottom = 14.0;
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262
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263 const float temperature_difference = temperature_bottom - temperature_surface;
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264
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265 // range 0.0 - 1.0
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266 float position_now = (ambient_pressure_mbar - surface_pressure_mbar) / bottom_mbar_diff_to_surface;
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267
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268 if(position_now <= 0)
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269 return temperature_surface;
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270
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271 if(position_now >= 1)
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272 return temperature_bottom;
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273
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274 return temperature_surface + (temperature_difference * position_now);
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275 }
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276
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277
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278 uint32_t demo_modify_temperature_and_pressure(int32_t divetime_in_seconds, uint8_t subseconds, float ceiling_mbar)
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279 {
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280
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281 const float descent_rate = 4000/60;
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282 const float ascent_rate = 1000/60;
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283 const uint32_t seconds_descend = (1 * 60) + 30;
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284 const uint32_t turbo_seconds_at_bottom_start = (0 * 60) + 0;
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285 const uint32_t seconds_descend_and_bottomtime = seconds_descend + turbo_seconds_at_bottom_start + (2 * 60) + 0;
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286 uint32_t time_elapsed_in_seconds;
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287 static float ambient_pressure_mbar_memory = 0;
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288 static uint32_t time_last_call = 0;
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289
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290 if(divetime_in_seconds <= seconds_descend)
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291 {
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292 ambient_pressure_mbar = (divetime_in_seconds * descent_rate) + ((float)(subseconds) * descent_rate) + surface_pressure_mbar;
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293 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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294
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295 time_last_call = divetime_in_seconds;
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296 return 0;
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297 }
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298 else
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299 if(divetime_in_seconds <= seconds_descend + turbo_seconds_at_bottom_start)
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300 {
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301 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar;
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302 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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303 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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304 time_last_call = divetime_in_seconds;
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305 return turbo_seconds_at_bottom_start;
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306 }
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307 else
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308 if(divetime_in_seconds <= seconds_descend_and_bottomtime)
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309 {
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310 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar;
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311 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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312 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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313 time_last_call = divetime_in_seconds;
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314 return 0;
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315 }
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316 else
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317 {
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318 time_elapsed_in_seconds = divetime_in_seconds - time_last_call;
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319 ambient_pressure_mbar = ambient_pressure_mbar_memory - time_elapsed_in_seconds * ascent_rate;
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320
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321 if(ambient_pressure_mbar < surface_pressure_mbar)
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322 ambient_pressure_mbar = surface_pressure_mbar;
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323 else if(ambient_pressure_mbar < ceiling_mbar)
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324 ambient_pressure_mbar = ceiling_mbar;
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325
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326 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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327 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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328 time_last_call = divetime_in_seconds;
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329 return 0;
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330 }
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331 }
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332 #endif
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333
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334 uint8_t is_init_pressure_done(void)
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335 {
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336 return pressureSensorInitSuccess;
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337 }
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338
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339 uint8_t init_pressure(void)
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340 {
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341 uint8_t buffer[1];
356
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342 buffer[0] = 0x1E; // Reset Command
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343 uint8_t retValue = 0xFF;
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344
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345 pressureSensorInitSuccess = false;
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346 init_pressure_history();
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347
356
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348 /* Probe new sensor first */
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349 retValue = I2C_Master_Transmit( DEVICE_PRESSURE_MS5837, buffer, 1);
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350 if(retValue != HAL_OK)
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351 {
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352 PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5803; // use old sensor
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353 HAL_Delay(100);
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354 MX_I2C1_Init();
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355 if (global.I2C_SystemStatus != HAL_OK)
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356 {
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357 if (MX_I2C1_TestAndClear() == GPIO_PIN_RESET) {
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358 MX_I2C1_TestAndClear(); // do it a second time
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359 }
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360 MX_I2C1_Init();
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361 }
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362 }
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363 else
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364 {
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365 PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5837; // Success, use new sensor
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366 }
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367 HAL_Delay(3); //2.8ms according to datasheet
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368
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369 buffer[0] = 0x1E; // Reset Command
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370 retValue = 0xFF;
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371
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372 /* Send reset request to pressure sensor */
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373 retValue = I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1);
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374 if(retValue != HAL_OK)
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375 {
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376 return (HAL_StatusTypeDef)retValue;
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377 }
356
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378 HAL_Delay(3); //2.8ms according to datasheet
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379
356
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380 for(uint8_t i=0;i<7;i++)
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381 {
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382 C[i] = get_ci_by_coef_num(i);
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383 }
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384 // n_crc = crc4(C); // no evaluation at the moment hw 151026
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385
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386 C5_x_2p8 = C[5] * 256;
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387 C2_x_2p16 = C[2] * 65536;
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388 C1_x_2p15 = C[1] * 32768;
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389
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390 if(global.I2C_SystemStatus == HAL_OK)
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391 {
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392 pressureSensorInitSuccess = 1;
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393 retValue = pressure_update();
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394
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395 }
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396 return retValue;
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397 }
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398
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399
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400 static uint32_t get_adc(void)
38
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401 {
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402 uint8_t buffer[1];
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403 uint8_t resivebuf[4];
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404 uint32_t answer = 0;
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405
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406 buffer[0] = 0x00; // Get ADC
356
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407 I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1);
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408 I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 4);
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409 resivebuf[3] = 0;
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410 answer = 256*256 *(uint32_t)resivebuf[0] + 256 * (uint32_t)resivebuf[1] + (uint32_t)resivebuf[2];
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411
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412 return answer;
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413 }
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414
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415
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diff changeset
416 static uint16_t get_ci_by_coef_num(uint8_t coef_num)
38
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417 {
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418 uint8_t resivebuf[2];
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419
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420 uint8_t cmd = CMD_PROM_RD+coef_num*2;
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421 I2C_Master_Transmit( PRESSURE_ADDRESS, &cmd, 1);
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422 I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 2);
38
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423 return (256*(uint16_t)resivebuf[0]) + (uint16_t)resivebuf[1];
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424 }
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425
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426
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427
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428 uint8_t pressure_update(void)
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429 {
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430 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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431
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432 statusReturn = pressure_sensor_get_data();
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433 pressure_calculation();
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434 return (uint8_t)statusReturn;
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435 }
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436
276
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437 /* Switch between pressure and temperature measurement with every successful read operation */
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438 void pressure_update_alternating(void)
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439 {
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440 static uint8_t getTemperature= 0;
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441
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442 if(getTemperature)
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443 {
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444 if(pressure_sensor_get_temperature_raw() == HAL_OK)
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445 {
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446 getTemperature = 0;
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447 }
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448 }
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449 else
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450 {
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451 if(pressure_sensor_get_pressure_raw() == HAL_OK)
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452 {
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453 getTemperature = 1;
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454 }
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455 }
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456 pressure_calculation();
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457 return;
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458 }
38
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459
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diff changeset
460 static uint32_t pressure_sensor_get_one_value(uint8_t cmd, HAL_StatusTypeDef *statusReturn)
38
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461 {
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462 uint8_t command = CMD_ADC_CONV + cmd;
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463 HAL_StatusTypeDef statusReturnTemp = HAL_TIMEOUT;
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464
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465 statusReturnTemp = I2C_Master_Transmit( PRESSURE_ADDRESS, &command, 1);
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466
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467 if(statusReturn)
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468 {
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469 *statusReturn = statusReturnTemp;
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470 }
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471
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472 switch (cmd & 0x0f) // wait necessary conversion time
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473 {
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474 case CMD_ADC_256 : HAL_Delay(1); break;
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475 case CMD_ADC_512 : HAL_Delay(3); break;
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476 case CMD_ADC_1024: HAL_Delay(4); break;
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477 case CMD_ADC_2048: HAL_Delay(6); break;
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478 case CMD_ADC_4096: HAL_Delay(10); break;
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479 }
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480 return get_adc();
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481 }
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482
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483
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484 static HAL_StatusTypeDef pressure_sensor_get_data(void)
38
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485 {
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486 uint32_t requestedValue = 0;
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487 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT;
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488 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT;
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489
276
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490
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491
276
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492 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn2);
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493 if (statusReturn2 == HAL_OK)
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494 {
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495 D2 = requestedValue;
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496 }
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497
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498 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn1);
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499 if (statusReturn1 == HAL_OK)
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500 {
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501 D1 = requestedValue;
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502 }
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503 if(statusReturn2 > statusReturn1) // if anything is not HAL_OK (0x00) or worse
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504 return statusReturn2;
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505 else
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506 return statusReturn1;
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507 }
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508
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509
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510 HAL_StatusTypeDef pressure_sensor_get_pressure_raw(void)
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511 {
276
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512 uint32_t requestedValue = 0;
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513 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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514
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515 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn);
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516 if (statusReturn == HAL_OK)
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517 {
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518 D1 = requestedValue;
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519 }
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520
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521 return statusReturn;
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522 }
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523
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524
276
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525 HAL_StatusTypeDef pressure_sensor_get_temperature_raw(void)
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526 {
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527 uint32_t requestedValue = 0;
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528 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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529
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530 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn);
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531 if (statusReturn == HAL_OK)
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532 {
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533 D2 = requestedValue;
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534 }
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535 return statusReturn;
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536 }
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537
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538
352
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539 #ifdef SIMULATE_PRESSURE
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540 void pressure_simulation()
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541 {
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542 static uint32_t tickstart = 0;
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543 static float pressure_sim_mbar = 0;
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544 static uint32_t passedSecond = 0;
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545 static uint32_t secondtick = 0;
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546
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547 uint32_t lasttick = 0;
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548
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549
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550
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551 if( tickstart == 0)
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552 {
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553 tickstart = HAL_GetTick(); /* init time stamp */
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554 secondtick = tickstart;
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555 pressure_sim_mbar = 1000;
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556 }
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557
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558 lasttick = HAL_GetTick();
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559 if(time_elapsed_ms(secondtick,lasttick) > 1000) /* one second passed since last tick */
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560 {
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561 secondtick = lasttick;
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562 passedSecond++;
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563
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564 #ifdef DIVE_AFTER_LANDING
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565 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */
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566 else if(passedSecond < 300) pressure_sim_mbar -= 1.0; /* decrease pressure in 5 minutes target 770mbar => delta 330 */
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567 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay stable 10 minutes*/
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568 else if(passedSecond < 1500) pressure_sim_mbar += 0.5; /* return to 1 bar in 10 Minutes*/
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569 else if(passedSecond < 1800) pressure_sim_mbar += 0.0; /* 5 minutes break */
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570 else if(passedSecond < 2000) pressure_sim_mbar += 10.0; /* start dive */
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571 else if(passedSecond < 2300) pressure_sim_mbar += 0.0; /* stay on depth */
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572 else if(passedSecond < 2500) pressure_sim_mbar -= 10.0; /* return to surface */
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573 else pressure_sim_mbar = 1000.0; /* final state */
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574 #else /* short dive */
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575 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */
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576 else if(passedSecond < 180) pressure_sim_mbar += 10.0; /* Start dive */
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577 else if(passedSecond < 300) pressure_sim_mbar += 0.0; /*stay on depth*/
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578 else if(passedSecond < 460) pressure_sim_mbar -= 10.0; /* return to surface */
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579 else if(passedSecond < 600) pressure_sim_mbar += 0.0; /* stay */
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580 else if(passedSecond < 610) pressure_sim_mbar = 1000.0; /* get ready for second dive */
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diff changeset
581 else if(passedSecond < 780) pressure_sim_mbar += 10.0; /* Start dive */
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diff changeset
582 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay on depth*/
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583 else if(passedSecond < 1060) pressure_sim_mbar -= 10.0; /* return to surface */
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diff changeset
584 else if(passedSecond < 1200) pressure_sim_mbar += 0.0; /* stay */
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585 else pressure_sim_mbar = 1000.0; /* final state */
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586 #endif
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587 }
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diff changeset
588
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diff changeset
589
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diff changeset
590 ambient_pressure_mbar = pressure_sim_mbar;
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diff changeset
591 ambient_temperature = 25.0;
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diff changeset
592 return;
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diff changeset
593 }
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594
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595 #endif
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diff changeset
596
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597 void pressure_calculation(void)
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598 {
241
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599 if(global.I2C_SystemStatus != HAL_OK)
38
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600 return;
352
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601
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diff changeset
602 #ifdef SIMULATE_PRESSURE
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603 pressure_simulation();
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604 #else
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605 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015();
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diff changeset
606 #endif
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607 }
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608
331
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609 static uint8_t pressure_plausible(float pressurevalue)
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610 {
b4c578caaafb Added plausibility check for pressure values
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diff changeset
611 static uint8_t pressurewriteindex = 0;
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612 uint8_t retval = 0;
b4c578caaafb Added plausibility check for pressure values
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613 uint8_t index;
b4c578caaafb Added plausibility check for pressure values
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diff changeset
614 float pressure_average = 0;
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diff changeset
615
b4c578caaafb Added plausibility check for pressure values
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616 for(index = 0; index < PRESSURE_HISTORY_SIZE; index++)
b4c578caaafb Added plausibility check for pressure values
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617 {
b4c578caaafb Added plausibility check for pressure values
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618 pressure_average += pressure_history_mbar[index];
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619 }
b4c578caaafb Added plausibility check for pressure values
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620 pressure_average /= PRESSURE_HISTORY_SIZE;
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621 if(pressure_average == 1000.0) /* first pressure calculation */
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622 {
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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623 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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624 {
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625 for(index = 0; index < PRESSURE_HISTORY_SIZE; index++)
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626 {
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627 pressure_history_mbar[index] = pressurevalue; /* set history to current value */
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628 retval = 1;
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629 }
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630 }
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631 }
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632 else
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633 {
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
634 pressure_history_mbar[pressurewriteindex++] = pressurevalue;
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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635 pressurewriteindex &= 0x7; /* wrap around if necessary */
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636 retval = 1;
331
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637 }
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638
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639 return retval;
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640 }
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641
186
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642 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void)
38
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643 {
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
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644 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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645 static uint8_t avgCnt = 0;
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646
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647 uint32_t local_D1; // ADC value of the pressure conversion
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648 uint32_t local_D2; // ADC value of the temperature conversion
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649 int32_t local_Px10; // compensated pressure value
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650 int32_t local_Tx100; // compensated temperature value
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651 int64_t local_dT; // int32_t, difference between actual and measured temperature
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652 int64_t local_OFF; // offset at actual temperature
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653 int64_t local_SENS; // sensitivity at actual temperature
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654
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655 float calc_pressure;
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656
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657 int64_t T2;
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658 int64_t OFF2;
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659 int64_t SENS2;
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660
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661 local_D1 = D1;
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662 local_D2 = D2;
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663
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664 local_dT = ((int64_t)local_D2) - ((int64_t)C[5]) * 256; //pow(2,8);
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665 local_OFF = ((int64_t)C[2]) * 65536 + local_dT * ((int64_t)C[4]) / 128; // pow(2,16), pow(2,7)
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666 local_SENS = ((int64_t)C[1]) * 32768 + local_dT * ((int64_t)C[3]) / 256; // pow(2,15), pow(2,8)
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667
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668 local_Tx100 = (int32_t)(2000 + (local_dT * ((int64_t)C[6])) / 8388608);// pow(2,23)
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669
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670
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671 if(local_Tx100 < 2000) // low temperature
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672 {
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673 T2 = 3 * local_dT;
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674 T2 *= local_dT;
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675 T2 /= 8589934592;
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676
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677 OFF2 = ((int64_t)local_Tx100) - 2000;
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678 OFF2 *= OFF2;
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679 OFF2 *= 3;
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680 OFF2 /= 2;
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681
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682 SENS2 = ((int64_t)local_Tx100) - 2000;
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683 SENS2 *= SENS2;
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684 SENS2 *= 5;
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685 SENS2 /= 8;
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686
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687 local_Tx100 -= (int32_t)T2;
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688 local_OFF -= OFF2;
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689 local_SENS -= SENS2;
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690 }
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691 else
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692 {
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693 T2 = 7 * local_dT;
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694 T2 *= local_dT;
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695 T2 /= 137438953472;
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696
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697 OFF2 = ((int64_t)local_Tx100) - 2000;
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698 OFF2 *= OFF2;
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699 OFF2 /= 16;
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700
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701 local_Tx100 -= (int32_t)T2;
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702 local_OFF -= OFF2;
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703 }
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704
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705 local_Px10 = (int32_t)(
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706 (((int64_t)((local_D1 * local_SENS) / 2097152)) - local_OFF)
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707 / 8192 );// )) / 10; // pow(2,21), pow(2,13)
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708
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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709 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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710 ambient_temperature += temperature_offset;
331
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711
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712 calc_pressure = ((float)local_Px10) / 10;
339
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713 calc_pressure += pressure_offset;
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714
331
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715 if(pressure_plausible(calc_pressure))
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716 {
335
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717 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
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718 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
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719 { /* 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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720 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
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721 }
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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diff changeset
722 ambient_pressure_mbar = runningAvg;
331
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diff changeset
723 }
38
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724 }
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725
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726
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727 /* taken from AN520 by meas-spec.com dated 9. Aug. 2011
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diff changeset
728 * short and int are both 16bit according to AVR/GCC google results
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729 */
356
cb3870f79e9d Add Support for new end-2019 hardware:
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730 /*static uint8_t crc4(uint16_t n_prom[])
38
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731 {
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732 uint16_t cnt; // simple counter
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733 uint16_t n_rem; // crc reminder
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734 uint16_t crc_read; // original value of the crc
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735 uint8_t n_bit;
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736 n_rem = 0x00;
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737 crc_read=n_prom[7]; //save read CRC
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738 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0
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739 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes
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740 { // choose LSB or MSB
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741 if (cnt%2==1) n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF);
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742 else n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8);
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743 for (n_bit = 8; n_bit > 0; n_bit--)
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744 {
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745 if (n_rem & (0x8000))
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746 {
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747 n_rem = (n_rem << 1) ^ 0x3000;
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748 }
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749 else
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750 {
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751 n_rem = (n_rem << 1);
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752 }
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753 }
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754 }
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755 n_rem= (0x000F & (n_rem >> 12)); // // final 4-bit reminder is CRC code
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756 n_prom[7]=crc_read; // restore the crc_read to its original place
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757 return (n_rem ^ 0x00);
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758 }
356
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diff changeset
759
38
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760 void test_calculation(void)
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761 {
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762 C1 = 29112;
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763 C2 = 26814;
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764 C3 = 19125;
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765 C4 = 17865;
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766 C5 = 32057;
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767 C6 = 31305;
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768
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769 C2_x_2p16 = C2 * 65536;
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770 C1_x_2p15 = C1 * 32768;
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771
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772 D1 = 4944364;
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773 D2 = 8198974;
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774 pressure_calculation() ;
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775 };
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776 */
339
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777 void pressure_set_offset (float pressureOffset, float temperatureOffset)
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778 {
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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779 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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780 {
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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781 ambient_pressure_mbar -= pressure_offset; /* revert old value */
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782 ambient_pressure_mbar += pressureOffset; /* apply new offset */
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diff changeset
783 init_surface_ring(1);
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diff changeset
784 }
38
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785
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
786 pressure_offset = pressureOffset;
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diff changeset
787 temperature_offset = temperatureOffset;
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diff changeset
788 }
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
789
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