annotate Small_CPU/Src/pressure.c @ 602:2cb0a97a07ad

Added replay data scaling in case life data is longer than replay block Minor: variable name changes
author Ideenmodellierer
date Tue, 05 Jan 2021 20:35:01 +0100
parents 4644891d2f51
children 8c92f7743e14
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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 (1060.0f) /* It is unlikely that pressure at surface is greater than this value => clip to it */
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54 #define PRESSURE_SURFACE_QUE (30u) /* history buffer [minutes] for past pressure measurements */
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55 #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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56 #define PRESSURE_SURFACE_STABLE_LIMIT (10u) /* Define pressure as stable if delta (mBar) is below this value */
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57 #define PRESSURE_SURFACE_DETECT_STABLE_CNT (5u) /* Event count to detect stable condition */
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58 #define PRESSURE_SURFACE_UNSTABLE_LIMIT (50u) /* Define pressure as not stable if delta (mBar) is larger than this value */
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59 #define PRESSURE_SURFACE_DETECT_UNSTABLE_CNT (3u) /* Event count to detect unstable condition */
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62 static uint8_t PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5803; /* Default Address */
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64 static uint16_t get_ci_by_coef_num(uint8_t coef_num);
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65 //void pressure_calculation_new(void);
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66 //void pressure_calculation_old(void);
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67 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void);
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68 //static uint8_t crc4(uint16_t n_prom[]);
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70 static HAL_StatusTypeDef pressure_sensor_get_data(void);
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71 static uint32_t get_adc(void);
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72 uint8_t pressureSensorInitSuccess = 0;
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74 static uint16_t C[8] = { 1 };
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75 static uint32_t D1 = 1;
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76 static uint32_t D2 = 1;
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77 //static uint8_t n_crc;
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79 /*
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80 short C2plus10000 = -1;
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81 short C3plus200 = -1;
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82 short C4minus250 = -1;
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83 short UT1 = -1;
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84 short C6plus100 = -1;
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85 */
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86 static float pressure_offset = 0.0; /* Offset value which may be specified by the user via PC Software */
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87 static float temperature_offset = 0.0; /* Offset value which may be specified by the user via PC Software */
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88
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89 static float ambient_temperature = 0;
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90 static float ambient_pressure_mbar = 1000.0;
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91 static float surface_pressure_mbar = 1000.0;
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92 static float surface_ring_mbar[PRESSURE_SURFACE_QUE] = { 0 };
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93
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94 static uint8_t surface_pressure_writeIndex = 0;
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95 static float surface_pressure_stable_value = 0;
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96 static uint8_t surface_pressure_stable = 0;
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98 static uint8_t secondCounterSurfaceRing = 0;
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99 static uint8_t avgCount = 0;
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100 static float runningAvg = 0;
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101
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102 float get_temperature(void)
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103 {
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104 return ambient_temperature;
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105 }
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106
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107 float get_pressure_mbar(void)
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108 {
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109 return ambient_pressure_mbar;
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110 }
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111
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112 float get_surface_mbar(void)
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113 {
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114 return surface_pressure_mbar;
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115 }
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117
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118 void init_surface_ring(uint8_t force)
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119 {
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120 if((surface_ring_mbar[0] == 0) || (force)) /* only initialize once. Keep value in place in case of an i2c recovery */
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121 {
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122 secondCounterSurfaceRing = 0; /* restart calculation */
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123 avgCount = 0;
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124 runningAvg = 0;
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125
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126 for(int i=0; i<PRESSURE_SURFACE_QUE; i++)
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127 surface_ring_mbar[i] = ambient_pressure_mbar;
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128 surface_pressure_mbar = ambient_pressure_mbar;
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129 surface_pressure_writeIndex = 0; /* index of the oldest value in the ring buffer */
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130 }
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131 }
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132
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133 uint8_t is_surface_pressure_stable(void)
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134 {
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135 return surface_pressure_stable;
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136 }
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137
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138 float set_last_surface_pressure_stable(void)
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139 {
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140 surface_pressure_mbar = surface_pressure_stable_value;
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141 return surface_pressure_stable_value;
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142 }
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143
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144 /* iterate backward through the history memory and evaluate the changes pressure changes during the last 30 minutes */
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145 void evaluate_surface_pressure()
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146 {
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147 uint8_t index;
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148 float lastvalue;
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149 uint8_t stablecnt = 0;
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150 uint8_t unstablecnt = 0;
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151 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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152 uint8_t EvaluatedValues = 0;
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153
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154 lastvalue = surface_ring_mbar[surface_pressure_writeIndex];
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155 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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156 index = surface_pressure_writeIndex;
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157 surface_pressure_stable = 1;
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158
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159 if(index == 0)
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160 {
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161 index = PRESSURE_SURFACE_QUE - 1;
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162 }
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163 else
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164 {
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165 index = index - 1;
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166 }
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167 do
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168 {
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169 if((EvaluatedValues < EvaluationWindow) &&
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170 (fabs(surface_pressure_stable_value - surface_ring_mbar[index]) > PRESSURE_SURFACE_UNSTABLE_LIMIT)) /* unusual change during last 30 minutes */
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171 {
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172 unstablecnt++;
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173 if(unstablecnt > PRESSURE_SURFACE_DETECT_UNSTABLE_CNT)
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174 {
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175 surface_pressure_stable = 0;
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176 }
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177 }
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178 /* search for a value which does not change for several iterations */
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179 if (fabs(lastvalue - surface_ring_mbar[index]) < PRESSURE_SURFACE_STABLE_LIMIT)
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180 {
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181 stablecnt++;
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182 }
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183 else
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184 {
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185 stablecnt = 0;
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186 }
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187 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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188 {
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189 surface_pressure_stable_value = surface_ring_mbar[index];
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190 unstablecnt = 0;
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191 }
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192
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193 lastvalue = surface_ring_mbar[index];
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194
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195 if(index == 0)
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196 {
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197 index = PRESSURE_SURFACE_QUE - 1;
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198 }
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199 else
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200 {
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201 index = index - 1;
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202 }
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203 EvaluatedValues++;
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204 } while (index != surface_pressure_writeIndex);
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205 }
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206 void update_surface_pressure(uint8_t call_rhythm_seconds)
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207 {
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208 if(is_init_pressure_done())
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209 {
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210 runningAvg = (runningAvg * avgCount + ambient_pressure_mbar) / (avgCount +1);
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211 avgCount++;
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212 secondCounterSurfaceRing += call_rhythm_seconds;
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213
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214 if(secondCounterSurfaceRing >= 60)
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215 {
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216 if(runningAvg < PRESSURE_SURFACE_MAX_MBAR)
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217 {
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218 surface_ring_mbar[surface_pressure_writeIndex] = runningAvg;
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219 }
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220 else
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221 {
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222 surface_ring_mbar[surface_pressure_writeIndex] = PRESSURE_SURFACE_MAX_MBAR;
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223 }
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224 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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225
352
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226 if(surface_pressure_writeIndex == PRESSURE_SURFACE_QUE)
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227 {
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228 surface_pressure_writeIndex = 0;
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229 }
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230
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231 surface_pressure_mbar = surface_ring_mbar[surface_pressure_writeIndex]; /* 30 minutes old measurement */
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232
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233 secondCounterSurfaceRing = 0;
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234 avgCount = 1; /* use the current value as starting point but restart the weight decrement of the measurements */
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235 }
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236 evaluate_surface_pressure();
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237 }
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238 }
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239
186
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240 #ifdef DEMOMODE
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241 float demo_modify_temperature_helper(float bottom_mbar_diff_to_surface)
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242 {
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243 const float temperature_surface = 31.0;
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244 const float temperature_bottom = 14.0;
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245
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246 const float temperature_difference = temperature_bottom - temperature_surface;
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247
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248 // range 0.0 - 1.0
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249 float position_now = (ambient_pressure_mbar - surface_pressure_mbar) / bottom_mbar_diff_to_surface;
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250
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251 if(position_now <= 0)
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252 return temperature_surface;
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253
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254 if(position_now >= 1)
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255 return temperature_bottom;
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256
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257 return temperature_surface + (temperature_difference * position_now);
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258 }
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259
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260
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261 uint32_t demo_modify_temperature_and_pressure(int32_t divetime_in_seconds, uint8_t subseconds, float ceiling_mbar)
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262 {
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263
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264 const float descent_rate = 4000/60;
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265 const float ascent_rate = 1000/60;
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266 const uint32_t seconds_descend = (1 * 60) + 30;
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267 const uint32_t turbo_seconds_at_bottom_start = (0 * 60) + 0;
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268 const uint32_t seconds_descend_and_bottomtime = seconds_descend + turbo_seconds_at_bottom_start + (2 * 60) + 0;
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269 uint32_t time_elapsed_in_seconds;
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270 static float ambient_pressure_mbar_memory = 0;
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271 static uint32_t time_last_call = 0;
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272
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273 if(divetime_in_seconds <= seconds_descend)
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274 {
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275 ambient_pressure_mbar = (divetime_in_seconds * descent_rate) + ((float)(subseconds) * descent_rate) + surface_pressure_mbar;
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276 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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277
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278 time_last_call = divetime_in_seconds;
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279 return 0;
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280 }
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281 else
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282 if(divetime_in_seconds <= seconds_descend + turbo_seconds_at_bottom_start)
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283 {
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284 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar;
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285 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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286 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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287 time_last_call = divetime_in_seconds;
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288 return turbo_seconds_at_bottom_start;
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289 }
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290 else
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291 if(divetime_in_seconds <= seconds_descend_and_bottomtime)
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292 {
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293 ambient_pressure_mbar = (seconds_descend * 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 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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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 {
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301 time_elapsed_in_seconds = divetime_in_seconds - time_last_call;
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302 ambient_pressure_mbar = ambient_pressure_mbar_memory - time_elapsed_in_seconds * ascent_rate;
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303
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304 if(ambient_pressure_mbar < surface_pressure_mbar)
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305 ambient_pressure_mbar = surface_pressure_mbar;
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306 else if(ambient_pressure_mbar < ceiling_mbar)
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307 ambient_pressure_mbar = ceiling_mbar;
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308
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309 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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310 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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311 time_last_call = divetime_in_seconds;
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312 return 0;
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313 }
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314 }
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315 #endif
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316
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317 uint8_t is_init_pressure_done(void)
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318 {
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319 return pressureSensorInitSuccess;
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320 }
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321
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322 uint8_t init_pressure(void)
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323 {
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324 uint8_t buffer[1];
356
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325 buffer[0] = 0x1E; // Reset Command
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326 uint8_t retValue = 0xFF;
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327
331
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328 pressureSensorInitSuccess = false;
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329
356
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330 /* Probe new sensor first */
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331 retValue = I2C_Master_Transmit( DEVICE_PRESSURE_MS5837, buffer, 1);
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332 if(retValue != HAL_OK)
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333 {
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334 PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5803; // use old sensor
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335 HAL_Delay(100);
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336 I2C_DeInit();
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337 HAL_Delay(100);
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338 MX_I2C1_Init();
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339 HAL_Delay(100);
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340 }
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341 else
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342 {
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343 PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5837; // Success, use new sensor
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344 }
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345 HAL_Delay(3); //2.8ms according to datasheet
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346
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347 buffer[0] = 0x1E; // Reset Command
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348 retValue = 0xFF;
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349
331
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350 /* Send reset request to pressure sensor */
356
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351 retValue = I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1);
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352 if(retValue != HAL_OK)
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353 {
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354 return (HAL_StatusTypeDef)retValue;
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355 }
356
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356 HAL_Delay(3); //2.8ms according to datasheet
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357
356
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358 for(uint8_t i=0;i<7;i++)
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359 {
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360 C[i] = get_ci_by_coef_num(i);
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361 }
356
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362 // n_crc = crc4(C); // no evaluation at the moment hw 151026
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363
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364 if(global.I2C_SystemStatus == HAL_OK)
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365 {
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366 pressureSensorInitSuccess = 1;
331
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367 retValue = pressure_update();
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368 }
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369 return retValue;
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370 }
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371
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372
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373 static uint32_t get_adc(void)
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374 {
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375 uint8_t buffer[1];
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376 uint8_t resivebuf[4];
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377 uint32_t answer = 0xFFFFFFFF;
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378
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379 buffer[0] = 0x00; // Get ADC
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380 if(I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1) == HAL_OK)
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381 {
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382 if(I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 4) == HAL_OK)
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383 {
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384 resivebuf[3] = 0;
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385 answer = 256*256 *(uint32_t)resivebuf[0] + 256 * (uint32_t)resivebuf[1] + (uint32_t)resivebuf[2];
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386 }
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387 }
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388 return answer;
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389 }
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390
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391
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392 static uint16_t get_ci_by_coef_num(uint8_t coef_num)
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393 {
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394 uint8_t resivebuf[2];
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395
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396 uint8_t cmd = CMD_PROM_RD+coef_num*2;
356
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397 I2C_Master_Transmit( PRESSURE_ADDRESS, &cmd, 1);
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398 I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 2);
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399 return (256*(uint16_t)resivebuf[0]) + (uint16_t)resivebuf[1];
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400 }
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401
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402
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403
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404 uint8_t pressure_update(void)
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405 {
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406 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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407
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408 statusReturn = pressure_sensor_get_data();
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409 pressure_calculation();
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410 return (uint8_t)statusReturn;
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411 }
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412
276
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413 /* Switch between pressure and temperature measurement with every successful read operation */
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414 void pressure_update_alternating(void)
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415 {
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416 static uint8_t getTemperature= 0;
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417
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418 if(getTemperature)
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419 {
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420 if(pressure_sensor_get_temperature_raw() == HAL_OK)
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421 {
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422 getTemperature = 0;
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423 }
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424 }
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425 else
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426 {
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427 if(pressure_sensor_get_pressure_raw() == HAL_OK)
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428 {
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429 getTemperature = 1;
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430 }
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431 }
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432 pressure_calculation();
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433 return;
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434 }
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435
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436 static uint32_t pressure_sensor_get_one_value(uint8_t cmd, HAL_StatusTypeDef *statusReturn)
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437 {
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438 uint8_t command = CMD_ADC_CONV + cmd;
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439 uint32_t adcValue = 0;
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440 HAL_StatusTypeDef statusReturnTemp = HAL_TIMEOUT;
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441
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442 statusReturnTemp = I2C_Master_Transmit( PRESSURE_ADDRESS, &command, 1);
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443
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444 if(statusReturn)
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445 {
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446 *statusReturn = statusReturnTemp;
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447 }
479
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448
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449 switch (cmd & 0x0f) // wait necessary conversion time
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450 {
488
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451 case CMD_ADC_256 : HAL_Delay(2); break;
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452 case CMD_ADC_512 : HAL_Delay(4); break;
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453 case CMD_ADC_1024: HAL_Delay(5); break;
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454 case CMD_ADC_2048: HAL_Delay(7); break;
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455 case CMD_ADC_4096: HAL_Delay(11); break;
479
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456 default:
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457 break;
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458 }
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459 adcValue = get_adc();
488
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460 /* if(adcValue == 0xFFFFFFFF)
479
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461 {
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462 if(statusReturn)
474
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463 {
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464 *statusReturn = HAL_ERROR;
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465 }
488
9eeab3fead8f Added "I2C_DeInit();" in hardware detection routines. It's the recommended way
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diff changeset
466 }*/
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467
474
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468 return adcValue;
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469 }
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470
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471
186
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472 static HAL_StatusTypeDef pressure_sensor_get_data(void)
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473 {
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474 uint32_t requestedValue = 0;
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475 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT;
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476 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT;
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477
276
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478
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479
488
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480 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_4096, &statusReturn2);
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481 if (statusReturn2 == HAL_OK)
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482 {
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483 D2 = requestedValue;
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484 }
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485
488
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486 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_4096, &statusReturn1);
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487 if (statusReturn1 == HAL_OK)
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488 {
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489 D1 = requestedValue;
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490 }
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491 if(statusReturn2 > statusReturn1) // if anything is not HAL_OK (0x00) or worse
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492 return statusReturn2;
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493 else
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494 return statusReturn1;
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495 }
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496
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497
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498 HAL_StatusTypeDef pressure_sensor_get_pressure_raw(void)
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499 {
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500 uint32_t requestedValue = 0;
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501 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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502
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503 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_4096, &statusReturn);
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504 if (statusReturn == HAL_OK)
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505 {
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506 D1 = requestedValue;
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507 }
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508
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509 return statusReturn;
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510 }
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511
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512
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513 HAL_StatusTypeDef pressure_sensor_get_temperature_raw(void)
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514 {
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515 uint32_t requestedValue = 0;
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516 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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517
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518 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_4096, &statusReturn);
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519 if (statusReturn == HAL_OK)
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520 {
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521 D2 = requestedValue;
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522 }
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523 return statusReturn;
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524 }
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525
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526
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527 #ifdef SIMULATE_PRESSURE
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528 void pressure_simulation()
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529 {
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530 static uint32_t tickstart = 0;
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531 static float pressure_sim_mbar = 0;
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532 static uint32_t passedSecond = 0;
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533 static uint32_t secondtick = 0;
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534
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535 uint32_t lasttick = 0;
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536
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537
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538
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539 if( tickstart == 0)
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540 {
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541 tickstart = HAL_GetTick(); /* init time stamp */
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542 secondtick = tickstart;
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543 pressure_sim_mbar = 1000;
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544 }
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545
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546 lasttick = HAL_GetTick();
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547 if(time_elapsed_ms(secondtick,lasttick) > 1000) /* one second passed since last tick */
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548 {
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549 secondtick = lasttick;
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550 passedSecond++;
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551
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552 #ifdef DIVE_AFTER_LANDING
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553 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */
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554 else if(passedSecond < 300) pressure_sim_mbar -= 1.0; /* decrease pressure in 5 minutes target 770mbar => delta 330 */
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555 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay stable 10 minutes*/
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556 else if(passedSecond < 1500) pressure_sim_mbar += 0.5; /* return to 1 bar in 10 Minutes*/
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557 else if(passedSecond < 1800) pressure_sim_mbar += 0.0; /* 5 minutes break */
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558 else if(passedSecond < 2000) pressure_sim_mbar += 10.0; /* start dive */
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559 else if(passedSecond < 2300) pressure_sim_mbar += 0.0; /* stay on depth */
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560 else if(passedSecond < 2500) pressure_sim_mbar -= 10.0; /* return to surface */
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561 else pressure_sim_mbar = 1000.0; /* final state */
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562 #else /* short dive */
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563 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */
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564 else if(passedSecond < 180) pressure_sim_mbar += 10.0; /* Start dive */
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565 else if(passedSecond < 300) pressure_sim_mbar += 0.0; /*stay on depth*/
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566 else if(passedSecond < 460) pressure_sim_mbar -= 10.0; /* return to surface */
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567 else if(passedSecond < 600) pressure_sim_mbar += 0.0; /* stay */
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568 else if(passedSecond < 610) pressure_sim_mbar = 1000.0; /* get ready for second dive */
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569 else if(passedSecond < 780) pressure_sim_mbar += 10.0; /* Start dive */
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570 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay on depth*/
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571 else if(passedSecond < 1060) pressure_sim_mbar -= 10.0; /* return to surface */
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572 else if(passedSecond < 1200) pressure_sim_mbar += 0.0; /* stay */
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573 else pressure_sim_mbar = 1000.0; /* final state */
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574 #endif
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575 }
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576
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577
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578 ambient_pressure_mbar = pressure_sim_mbar;
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579 ambient_temperature = 25.0;
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580 return;
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581 }
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582
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583 #endif
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584
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585 void pressure_calculation(void)
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586 {
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587 if(global.I2C_SystemStatus != HAL_OK)
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588 return;
352
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589
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590 #ifdef SIMULATE_PRESSURE
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591 pressure_simulation();
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592 #else
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593 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015();
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594 #endif
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595 }
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596
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diff changeset
597 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void)
38
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598 {
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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599 static float runningAvg = 0;
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600 static uint8_t avgCnt = 0;
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601
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602 uint32_t local_D1; // ADC value of the pressure conversion
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603 uint32_t local_D2; // ADC value of the temperature conversion
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604 int32_t local_Px10; // compensated pressure value
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605 int32_t local_Tx100; // compensated temperature value
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606 int64_t local_dT; // int32_t, difference between actual and measured temperature
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607 int64_t local_OFF; // offset at actual temperature
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608 int64_t local_SENS; // sensitivity at actual temperature
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609
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diff changeset
610 float calc_pressure;
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611
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612 int64_t T2;
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613 int64_t OFF2;
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614 int64_t SENS2;
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615
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616 local_D1 = D1;
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617 local_D2 = D2;
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618
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619 local_dT = ((int64_t)local_D2) - ((int64_t)C[5]) * 256; //pow(2,8);
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620 local_OFF = ((int64_t)C[2]) * 65536 + local_dT * ((int64_t)C[4]) / 128; // pow(2,16), pow(2,7)
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621 local_SENS = ((int64_t)C[1]) * 32768 + local_dT * ((int64_t)C[3]) / 256; // pow(2,15), pow(2,8)
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622
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623 local_Tx100 = (int32_t)(2000 + (local_dT * ((int64_t)C[6])) / 8388608);// pow(2,23)
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624
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625
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626 if(local_Tx100 < 2000) // low temperature
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627 {
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628 T2 = 3 * local_dT;
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629 T2 *= local_dT;
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630 T2 /= 8589934592;
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631
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632 OFF2 = ((int64_t)local_Tx100) - 2000;
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633 OFF2 *= OFF2;
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634 OFF2 *= 3;
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635 OFF2 /= 2;
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636
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637 SENS2 = ((int64_t)local_Tx100) - 2000;
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638 SENS2 *= SENS2;
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639 SENS2 *= 5;
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640 SENS2 /= 8;
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641
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642 local_Tx100 -= (int32_t)T2;
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643 local_OFF -= OFF2;
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644 local_SENS -= SENS2;
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645 }
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646 else
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647 {
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648 T2 = 7 * local_dT;
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649 T2 *= local_dT;
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650 T2 /= 137438953472;
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651
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652 OFF2 = ((int64_t)local_Tx100) - 2000;
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653 OFF2 *= OFF2;
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654 OFF2 /= 16;
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655
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656 local_Tx100 -= (int32_t)T2;
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657 local_OFF -= OFF2;
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658 }
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659
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660 local_Px10 = (int32_t)(
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661 (((int64_t)((local_D1 * local_SENS) / 2097152)) - local_OFF)
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662 / 8192 );// )) / 10; // pow(2,21), pow(2,13)
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663
339
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664 ambient_temperature = ((float)local_Tx100) / 100;
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665 ambient_temperature += temperature_offset;
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666
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667 calc_pressure = ((float)local_Px10) / 10;
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668 calc_pressure += pressure_offset;
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669
480
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670 runningAvg = (avgCnt * runningAvg + calc_pressure) / (avgCnt + 1);
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671 if (avgCnt < 10) /* build an average considering the last measurements to have a weight "1 of 10" */
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672 { /* Main reason for this is the jitter of up to +-10 HPa in surface mode which is caused */
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673 avgCnt++; /* by the measurement range of the sensor which is focused on under water pressure measurement */
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674 }
480
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675 ambient_pressure_mbar = runningAvg;
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676 }
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677
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678
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679 /* taken from AN520 by meas-spec.com dated 9. Aug. 2011
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680 * short and int are both 16bit according to AVR/GCC google results
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681 */
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682 /*static uint8_t crc4(uint16_t n_prom[])
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683 {
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684 uint16_t cnt; // simple counter
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685 uint16_t n_rem; // crc reminder
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686 uint16_t crc_read; // original value of the crc
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687 uint8_t n_bit;
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688 n_rem = 0x00;
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689 crc_read=n_prom[7]; //save read CRC
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690 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0
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691 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes
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692 { // choose LSB or MSB
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693 if (cnt%2==1) n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF);
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694 else n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8);
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695 for (n_bit = 8; n_bit > 0; n_bit--)
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696 {
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697 if (n_rem & (0x8000))
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698 {
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699 n_rem = (n_rem << 1) ^ 0x3000;
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700 }
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701 else
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702 {
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703 n_rem = (n_rem << 1);
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704 }
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705 }
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706 }
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707 n_rem= (0x000F & (n_rem >> 12)); // // final 4-bit reminder is CRC code
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708 n_prom[7]=crc_read; // restore the crc_read to its original place
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709 return (n_rem ^ 0x00);
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710 }
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711
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712 void test_calculation(void)
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713 {
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714 C1 = 29112;
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715 C2 = 26814;
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716 C3 = 19125;
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717 C4 = 17865;
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718 C5 = 32057;
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719 C6 = 31305;
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720
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721 C2_x_2p16 = C2 * 65536;
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722 C1_x_2p15 = C1 * 32768;
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723
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724 D1 = 4944364;
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725 D2 = 8198974;
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726 pressure_calculation() ;
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727 };
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728 */
339
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729 void pressure_set_offset (float pressureOffset, float temperatureOffset)
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730 {
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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731 if(pressure_offset != pressureOffset) /* we received a new value => reinit surface que */
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732 {
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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733 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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734 ambient_pressure_mbar += pressureOffset; /* apply new offset */
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735 init_surface_ring(1);
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736 }
38
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737
339
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738 pressure_offset = pressureOffset;
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739 temperature_offset = temperatureOffset;
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740 }
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
741
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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742