annotate Small_CPU/Src/pressure.c @ 911:a2523e19f59a Evo_2_23

VPMTable deco stop visualization: The current deco stop will change from white to green to indicate that the diver is in the region where the stop time is counted down.
author Ideenmodellierer
date Tue, 15 Oct 2024 20:00:37 +0200
parents 3311b720a072
children
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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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52
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53 #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
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55 #define PRESSURE_MINIMUM (0.0f)
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56 #define TEMPERATURE_MINIMUM (-100.0f)
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58 #define PRESSURE_SURFACE_QUE (30u) /* history buffer [minutes] for past pressure measurements */
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59 #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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60 #define PRESSURE_SURFACE_STABLE_LIMIT (10u) /* Define pressure as stable if delta (mBar) is below this value */
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61 #define PRESSURE_SURFACE_DETECT_STABLE_CNT (5u) /* Event count to detect stable condition */
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62 #define PRESSURE_SURFACE_UNSTABLE_LIMIT (50u) /* Define pressure as not stable if delta (mBar) is larger than this value */
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63 #define PRESSURE_SURFACE_DETECT_UNSTABLE_CNT (3u) /* Event count to detect unstable condition */
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66 static uint8_t PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5803; /* Default Address */
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68 static uint16_t get_ci_by_coef_num(uint8_t coef_num);
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69 //void pressure_calculation_new(void);
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70 //void pressure_calculation_old(void);
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71 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void);
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72 //static uint8_t crc4(uint16_t n_prom[]);
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74 static HAL_StatusTypeDef pressure_sensor_get_data(void);
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75 static uint32_t get_adc(void);
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76 uint8_t pressureSensorInitSuccess = 0;
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78 static uint16_t C[8] = { 1 };
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79 static uint32_t D1 = 1;
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80 static uint32_t D2 = 1;
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81 //static uint8_t n_crc;
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83 /*
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84 short C2plus10000 = -1;
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85 short C3plus200 = -1;
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86 short C4minus250 = -1;
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87 short UT1 = -1;
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88 short C6plus100 = -1;
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89 */
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90 static float pressure_offset = 0.0; /* Offset value which may be specified by the user via PC Software */
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91 static float temperature_offset = 0.0; /* Offset value which may be specified by the user via PC Software */
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92
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93 static float ambient_temperature = 0;
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94 static float ambient_pressure_mbar = 1000.0;
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95 static float surface_pressure_mbar = 1000.0;
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96 static float surface_ring_mbar[PRESSURE_SURFACE_QUE] = { 0 };
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98 static uint8_t surface_pressure_writeIndex = 0;
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99 static float surface_pressure_stable_value = 0;
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100 static uint8_t surface_pressure_stable = 0;
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102 static uint8_t secondCounterSurfaceRing = 0;
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103 static uint8_t avgCount = 0;
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104 static float runningAvg = 0;
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105
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106 float get_temperature(void)
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107 {
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108 return ambient_temperature;
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109 }
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110
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111 float get_pressure_mbar(void)
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112 {
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113 return ambient_pressure_mbar;
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114 }
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115
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116 float get_surface_mbar(void)
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117 {
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118 return surface_pressure_mbar;
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119 }
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120
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121
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122 void init_surface_ring(uint8_t force)
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123 {
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124 if((surface_ring_mbar[0] == 0) || (force)) /* only initialize once. Keep value in place in case of an i2c recovery */
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125 {
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126 secondCounterSurfaceRing = 0; /* restart calculation */
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127 avgCount = 0;
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128 runningAvg = 0;
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129
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130 for(int i=0; i<PRESSURE_SURFACE_QUE; i++)
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131 surface_ring_mbar[i] = ambient_pressure_mbar;
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132 surface_pressure_mbar = ambient_pressure_mbar;
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133 surface_pressure_stable_value = surface_pressure_mbar;
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134 surface_pressure_writeIndex = 0; /* index of the oldest value in the ring buffer */
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135 }
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136 }
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137
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138 uint8_t is_surface_pressure_stable(void)
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139 {
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140 return surface_pressure_stable;
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141 }
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142
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143 float set_last_surface_pressure_stable(void)
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144 {
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145 surface_pressure_mbar = surface_pressure_stable_value;
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146 return surface_pressure_stable_value;
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147 }
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148
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149 /* iterate backward through the history memory and evaluate the changes pressure changes during the last 30 minutes */
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150 void evaluate_surface_pressure()
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151 {
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152 uint8_t index;
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153 float lastvalue;
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154 uint8_t stablecnt = 0;
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155 uint8_t unstablecnt = 0;
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156 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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157 uint8_t EvaluatedValues = 0;
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158
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159 lastvalue = surface_ring_mbar[surface_pressure_writeIndex];
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160 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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161 index = surface_pressure_writeIndex;
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162 surface_pressure_stable = 1;
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163
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164 if(index == 0)
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165 {
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166 index = PRESSURE_SURFACE_QUE - 1;
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167 }
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168 else
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169 {
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170 index = index - 1;
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171 }
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172 do
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173 {
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174 if((EvaluatedValues < EvaluationWindow) &&
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175 (fabs(surface_pressure_stable_value - surface_ring_mbar[index]) > PRESSURE_SURFACE_UNSTABLE_LIMIT)) /* unusual change during last 30 minutes */
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176 {
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177 unstablecnt++;
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178 if(unstablecnt > PRESSURE_SURFACE_DETECT_UNSTABLE_CNT)
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179 {
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180 surface_pressure_stable = 0;
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181 }
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182 }
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183 /* search for a value which does not change for several iterations */
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184 if (fabs(lastvalue - surface_ring_mbar[index]) < PRESSURE_SURFACE_STABLE_LIMIT)
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185 {
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186 stablecnt++;
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187 }
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188 else
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189 {
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190 stablecnt = 0;
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191 }
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192 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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193 {
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194 surface_pressure_stable_value = surface_ring_mbar[index];
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195 unstablecnt = 0;
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196 }
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197
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198 lastvalue = surface_ring_mbar[index];
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199
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200 if(index == 0)
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201 {
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202 index = PRESSURE_SURFACE_QUE - 1;
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203 }
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204 else
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205 {
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206 index = index - 1;
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207 }
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208 EvaluatedValues++;
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209 } while (index != surface_pressure_writeIndex);
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210 }
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211 void update_surface_pressure(uint8_t call_rhythm_seconds)
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212 {
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213 if(is_init_pressure_done())
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214 {
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215 runningAvg = (runningAvg * avgCount + ambient_pressure_mbar) / (avgCount +1);
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216 avgCount++;
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217 secondCounterSurfaceRing += call_rhythm_seconds;
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218
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219 if(secondCounterSurfaceRing >= 60)
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220 {
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221 if(runningAvg < PRESSURE_SURFACE_MAX_MBAR)
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222 {
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223 surface_ring_mbar[surface_pressure_writeIndex] = runningAvg;
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224 }
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225 else
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226 {
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227 surface_ring_mbar[surface_pressure_writeIndex] = PRESSURE_SURFACE_MAX_MBAR;
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228 }
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229 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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230
352
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231 if(surface_pressure_writeIndex == PRESSURE_SURFACE_QUE)
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232 {
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233 surface_pressure_writeIndex = 0;
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234 }
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235
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236 surface_pressure_mbar = surface_ring_mbar[surface_pressure_writeIndex]; /* 30 minutes old measurement */
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237
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238 secondCounterSurfaceRing = 0;
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239 avgCount = 1; /* use the current value as starting point but restart the weight decrement of the measurements */
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240
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241 evaluate_surface_pressure();
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242 }
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243 }
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244 }
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245
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246 #ifdef DEMOMODE
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247 float demo_modify_temperature_helper(float bottom_mbar_diff_to_surface)
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248 {
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249 const float temperature_surface = 31.0;
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250 const float temperature_bottom = 14.0;
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251
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252 const float temperature_difference = temperature_bottom - temperature_surface;
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253
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254 // range 0.0 - 1.0
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255 float position_now = (ambient_pressure_mbar - surface_pressure_mbar) / bottom_mbar_diff_to_surface;
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256
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257 if(position_now <= 0)
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258 return temperature_surface;
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259
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260 if(position_now >= 1)
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261 return temperature_bottom;
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262
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263 return temperature_surface + (temperature_difference * position_now);
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264 }
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265
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266
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267 uint32_t demo_modify_temperature_and_pressure(int32_t divetime_in_seconds, uint8_t subseconds, float ceiling_mbar)
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268 {
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269
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270 const float descent_rate = 4000/60;
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271 const float ascent_rate = 1000/60;
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272 const uint32_t seconds_descend = (1 * 60) + 30;
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273 const uint32_t turbo_seconds_at_bottom_start = (0 * 60) + 0;
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274 const uint32_t seconds_descend_and_bottomtime = seconds_descend + turbo_seconds_at_bottom_start + (2 * 60) + 0;
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275 uint32_t time_elapsed_in_seconds;
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276 static float ambient_pressure_mbar_memory = 0;
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277 static uint32_t time_last_call = 0;
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278
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279 if(divetime_in_seconds <= seconds_descend)
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280 {
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281 ambient_pressure_mbar = (divetime_in_seconds * descent_rate) + ((float)(subseconds) * descent_rate) + surface_pressure_mbar;
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282 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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283
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284 time_last_call = divetime_in_seconds;
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285 return 0;
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286 }
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287 else
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288 if(divetime_in_seconds <= seconds_descend + turbo_seconds_at_bottom_start)
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289 {
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290 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar;
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291 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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292 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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293 time_last_call = divetime_in_seconds;
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294 return turbo_seconds_at_bottom_start;
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295 }
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296 else
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297 if(divetime_in_seconds <= seconds_descend_and_bottomtime)
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298 {
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299 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar;
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300 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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301 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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302 time_last_call = divetime_in_seconds;
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303 return 0;
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304 }
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305 else
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306 {
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307 time_elapsed_in_seconds = divetime_in_seconds - time_last_call;
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308 ambient_pressure_mbar = ambient_pressure_mbar_memory - time_elapsed_in_seconds * ascent_rate;
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309
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310 if(ambient_pressure_mbar < surface_pressure_mbar)
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311 ambient_pressure_mbar = surface_pressure_mbar;
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312 else if(ambient_pressure_mbar < ceiling_mbar)
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313 ambient_pressure_mbar = ceiling_mbar;
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314
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315 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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316 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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317 time_last_call = divetime_in_seconds;
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318 return 0;
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319 }
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320 }
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321 #endif
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322
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323 uint8_t is_init_pressure_done(void)
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324 {
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325 return pressureSensorInitSuccess;
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326 }
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327
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328 uint8_t init_pressure(void)
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329 {
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330 uint8_t buffer[1];
356
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331 buffer[0] = 0x1E; // Reset Command
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332 uint8_t retValue = 0xFF;
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333
331
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334 pressureSensorInitSuccess = false;
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335
356
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336 /* Probe new sensor first */
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337 retValue = I2C_Master_Transmit( DEVICE_PRESSURE_MS5837, buffer, 1);
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338 if(retValue != HAL_OK)
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339 {
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340 PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5803; // use old sensor
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341 HAL_Delay(100);
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342 I2C_DeInit();
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343 HAL_Delay(100);
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344 MX_I2C1_Init();
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345 HAL_Delay(100);
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346 }
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347 else
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348 {
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349 PRESSURE_ADDRESS = DEVICE_PRESSURE_MS5837; // Success, use new sensor
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350 }
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351 HAL_Delay(3); //2.8ms according to datasheet
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352
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353 buffer[0] = 0x1E; // Reset Command
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354 retValue = 0xFF;
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355
331
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356 /* Send reset request to pressure sensor */
356
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357 retValue = I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1);
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358 if(retValue != HAL_OK)
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359 {
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360 return (HAL_StatusTypeDef)retValue;
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361 }
356
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362 HAL_Delay(3); //2.8ms according to datasheet
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363
356
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364 for(uint8_t i=0;i<7;i++)
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365 {
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366 C[i] = get_ci_by_coef_num(i);
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367 }
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368 // n_crc = crc4(C); // no evaluation at the moment hw 151026
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369
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370 if(global.I2C_SystemStatus == HAL_OK)
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371 {
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372 pressureSensorInitSuccess = 1;
331
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373 retValue = pressure_update();
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374 }
331
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375 return retValue;
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376 }
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377
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378
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379 static uint32_t get_adc(void)
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380 {
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381 uint8_t buffer[1];
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382 uint8_t resivebuf[4];
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383 uint32_t answer = 0xFFFFFFFF;
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384
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385 buffer[0] = 0x00; // Get ADC
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386 if(I2C_Master_Transmit( PRESSURE_ADDRESS, buffer, 1) == HAL_OK)
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387 {
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388 if(I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 4) == HAL_OK)
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389 {
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390 resivebuf[3] = 0;
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391 answer = 256*256 *(uint32_t)resivebuf[0] + 256 * (uint32_t)resivebuf[1] + (uint32_t)resivebuf[2];
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392 }
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393 }
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394 return answer;
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395 }
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396
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397
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398 static uint16_t get_ci_by_coef_num(uint8_t coef_num)
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399 {
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400 uint8_t resivebuf[2];
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401
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402 uint8_t cmd = CMD_PROM_RD+coef_num*2;
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403 I2C_Master_Transmit( PRESSURE_ADDRESS, &cmd, 1);
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404 I2C_Master_Receive( PRESSURE_ADDRESS, resivebuf, 2);
38
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405 return (256*(uint16_t)resivebuf[0]) + (uint16_t)resivebuf[1];
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406 }
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407
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408
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409
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410 uint8_t pressure_update(void)
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411 {
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412 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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413
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414 statusReturn = pressure_sensor_get_data();
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415 pressure_calculation();
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416 return (uint8_t)statusReturn;
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417 }
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418
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419 /* Switch between pressure and temperature measurement with every successful read operation */
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420 void pressure_update_alternating(void)
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421 {
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422 static uint8_t getTemperature= 0;
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423
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424 if(getTemperature)
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425 {
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426 if(pressure_sensor_get_temperature_raw() == HAL_OK)
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427 {
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428 getTemperature = 0;
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429 }
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430 }
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431 else
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432 {
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433 if(pressure_sensor_get_pressure_raw() == HAL_OK)
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434 {
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435 getTemperature = 1;
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436 }
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437 }
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438 pressure_calculation();
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439 return;
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440 }
38
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441
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442 static uint32_t pressure_sensor_get_one_value(uint8_t cmd, HAL_StatusTypeDef *statusReturn)
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443 {
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444 uint8_t command = CMD_ADC_CONV + cmd;
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445 uint32_t adcValue = 0;
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446 HAL_StatusTypeDef statusReturnTemp = HAL_TIMEOUT;
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447
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448 statusReturnTemp = I2C_Master_Transmit( PRESSURE_ADDRESS, &command, 1);
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449
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450 if(statusReturn)
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451 {
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452 *statusReturn = statusReturnTemp;
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453 }
479
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454
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455 switch (cmd & 0x0f) // wait necessary conversion time
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456 {
488
9eeab3fead8f Added "I2C_DeInit();" in hardware detection routines. It's the recommended way
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457 case CMD_ADC_256 : HAL_Delay(2); break;
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458 case CMD_ADC_512 : HAL_Delay(4); break;
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459 case CMD_ADC_1024: HAL_Delay(5); break;
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460 case CMD_ADC_2048: HAL_Delay(7); break;
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461 case CMD_ADC_4096: HAL_Delay(11); break;
479
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462 default:
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463 break;
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464 }
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465 adcValue = get_adc();
488
9eeab3fead8f Added "I2C_DeInit();" in hardware detection routines. It's the recommended way
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466 /* if(adcValue == 0xFFFFFFFF)
479
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467 {
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468 if(statusReturn)
474
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469 {
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470 *statusReturn = HAL_ERROR;
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471 }
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472 }*/
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473
474
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474 return adcValue;
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475 }
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476
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477
186
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478 static HAL_StatusTypeDef pressure_sensor_get_data(void)
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479 {
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480 uint32_t requestedValue = 0;
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481 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT;
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482 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT;
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483
276
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484
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485
488
9eeab3fead8f Added "I2C_DeInit();" in hardware detection routines. It's the recommended way
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486 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_4096, &statusReturn2);
276
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487 if (statusReturn2 == HAL_OK)
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488 {
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489 D2 = requestedValue;
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490 }
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491
488
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diff changeset
492 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_4096, &statusReturn1);
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493 if (statusReturn1 == HAL_OK)
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494 {
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495 D1 = requestedValue;
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496 }
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497 if(statusReturn2 > statusReturn1) // if anything is not HAL_OK (0x00) or worse
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498 return statusReturn2;
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499 else
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500 return statusReturn1;
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501 }
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502
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503
276
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504 HAL_StatusTypeDef pressure_sensor_get_pressure_raw(void)
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505 {
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506 uint32_t requestedValue = 0;
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507 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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508
488
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509 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_4096, &statusReturn);
276
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510 if (statusReturn == HAL_OK)
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511 {
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512 D1 = requestedValue;
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513 }
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514
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515 return statusReturn;
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516 }
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517
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518
276
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519 HAL_StatusTypeDef pressure_sensor_get_temperature_raw(void)
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520 {
276
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521 uint32_t requestedValue = 0;
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522 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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523
488
9eeab3fead8f Added "I2C_DeInit();" in hardware detection routines. It's the recommended way
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524 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_4096, &statusReturn);
276
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525 if (statusReturn == HAL_OK)
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526 {
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527 D2 = requestedValue;
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528 }
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529 return statusReturn;
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530 }
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531
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532
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diff changeset
533 #ifdef SIMULATE_PRESSURE
867
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534
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535 #define SECDIV 10 /* update every 100ms */
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536
352
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537 void pressure_simulation()
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538 {
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diff changeset
539 static uint32_t tickstart = 0;
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540 static float pressure_sim_mbar = 0;
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541 static uint32_t passedSecond = 0;
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542 static uint32_t secondtick = 0;
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543 static uint32_t lastsecondtick = 0;
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544 static float delta_mbar = 0.0;
352
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545
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546 uint32_t lasttick = 0;
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547
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parents: 351
diff changeset
548
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diff changeset
549
1f24022345d1 Fix merge problem
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550 if( tickstart == 0)
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551 {
1f24022345d1 Fix merge problem
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diff changeset
552 tickstart = HAL_GetTick(); /* init time stamp */
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553 secondtick = tickstart;
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554 pressure_sim_mbar = 1000;
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555 }
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diff changeset
556
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diff changeset
557 lasttick = HAL_GetTick();
867
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diff changeset
558 if(time_elapsed_ms(secondtick,lasttick) >= (1000 / SECDIV)) /* one second passed since last tick */
352
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parents: 351
diff changeset
559 {
867
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diff changeset
560 if(time_elapsed_ms(lastsecondtick,lasttick) > 1000)
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diff changeset
561 {
3311b720a072 Decrease calculation interval for ascend speed:
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562 passedSecond++;
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563 lastsecondtick = lasttick;
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564 }
352
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565 secondtick = lasttick;
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566
867
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567 #define DIVE_AT_SPEED 1
352
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568 #ifdef DIVE_AFTER_LANDING
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diff changeset
569 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */
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570 else if(passedSecond < 300) pressure_sim_mbar -= 1.0; /* decrease pressure in 5 minutes target 770mbar => delta 330 */
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571 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay stable 10 minutes*/
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572 else if(passedSecond < 1500) pressure_sim_mbar += 0.5; /* return to 1 bar in 10 Minutes*/
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diff changeset
573 else if(passedSecond < 1800) pressure_sim_mbar += 0.0; /* 5 minutes break */
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diff changeset
574 else if(passedSecond < 2000) pressure_sim_mbar += 10.0; /* start dive */
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diff changeset
575 else if(passedSecond < 2300) pressure_sim_mbar += 0.0; /* stay on depth */
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diff changeset
576 else if(passedSecond < 2500) pressure_sim_mbar -= 10.0; /* return to surface */
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577 else pressure_sim_mbar = 1000.0; /* final state */
867
3311b720a072 Decrease calculation interval for ascend speed:
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diff changeset
578 #endif
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Ideenmodellierer
parents: 858
diff changeset
579 #ifdef DIVE_AT_SPEED
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diff changeset
580 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */
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parents: 858
diff changeset
581 else if(passedSecond < 20) delta_mbar = 200.0 / SECDIV; /* Start dive */
3311b720a072 Decrease calculation interval for ascend speed:
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parents: 858
diff changeset
582 else if(passedSecond < 30) delta_mbar = 0.0; /*stay on depth*/
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Ideenmodellierer
parents: 858
diff changeset
583 else if(passedSecond < 45) delta_mbar -= 0.2 / SECDIV; /* return to surface */
3311b720a072 Decrease calculation interval for ascend speed:
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diff changeset
584 else if(passedSecond < 40) delta_mbar -= 0.4 / SECDIV; /* stay */
3311b720a072 Decrease calculation interval for ascend speed:
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diff changeset
585 else if(passedSecond < 50) delta_mbar += 0.3 / SECDIV; /* get ready for second dive */
3311b720a072 Decrease calculation interval for ascend speed:
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diff changeset
586 else if(passedSecond < 60) delta_mbar -= 0.4; /*stay on depth*/
3311b720a072 Decrease calculation interval for ascend speed:
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diff changeset
587 else if(passedSecond < 70) delta_mbar = 0.2;
3311b720a072 Decrease calculation interval for ascend speed:
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diff changeset
588 else if(passedSecond < 1060) pressure_sim_mbar -= 10.0/ SECDIV; /* return to surface */
3311b720a072 Decrease calculation interval for ascend speed:
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diff changeset
589 else if(passedSecond < 1200) pressure_sim_mbar += 0.0; /* stay */
3311b720a072 Decrease calculation interval for ascend speed:
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diff changeset
590 else { pressure_sim_mbar = 1000.0; delta_mbar = 0.0;} /* final state */
3311b720a072 Decrease calculation interval for ascend speed:
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diff changeset
591
3311b720a072 Decrease calculation interval for ascend speed:
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parents: 858
diff changeset
592 pressure_sim_mbar += delta_mbar;
3311b720a072 Decrease calculation interval for ascend speed:
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parents: 858
diff changeset
593 if(pressure_sim_mbar < surface_pressure_mbar)
3311b720a072 Decrease calculation interval for ascend speed:
Ideenmodellierer
parents: 858
diff changeset
594 {
3311b720a072 Decrease calculation interval for ascend speed:
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parents: 858
diff changeset
595 pressure_sim_mbar = surface_pressure_mbar;
3311b720a072 Decrease calculation interval for ascend speed:
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diff changeset
596 }
3311b720a072 Decrease calculation interval for ascend speed:
Ideenmodellierer
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diff changeset
597
352
1f24022345d1 Fix merge problem
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diff changeset
598 #else /* short dive */
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diff changeset
599 if(passedSecond < 10) pressure_sim_mbar = 1000.0; /* stay stable for 10 seconds */
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diff changeset
600 else if(passedSecond < 180) pressure_sim_mbar += 10.0; /* Start dive */
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diff changeset
601 else if(passedSecond < 300) pressure_sim_mbar += 0.0; /*stay on depth*/
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diff changeset
602 else if(passedSecond < 460) pressure_sim_mbar -= 10.0; /* return to surface */
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603 else if(passedSecond < 600) pressure_sim_mbar += 0.0; /* stay */
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604 else if(passedSecond < 610) pressure_sim_mbar = 1000.0; /* get ready for second dive */
1f24022345d1 Fix merge problem
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diff changeset
605 else if(passedSecond < 780) pressure_sim_mbar += 10.0; /* Start dive */
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diff changeset
606 else if(passedSecond < 900) pressure_sim_mbar += 0.0; /*stay on depth*/
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diff changeset
607 else if(passedSecond < 1060) pressure_sim_mbar -= 10.0; /* return to surface */
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diff changeset
608 else if(passedSecond < 1200) pressure_sim_mbar += 0.0; /* stay */
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diff changeset
609 else pressure_sim_mbar = 1000.0; /* final state */
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parents: 351
diff changeset
610 #endif
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diff changeset
611 }
1f24022345d1 Fix merge problem
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diff changeset
612
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parents: 351
diff changeset
613
1f24022345d1 Fix merge problem
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parents: 351
diff changeset
614 ambient_pressure_mbar = pressure_sim_mbar;
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diff changeset
615 ambient_temperature = 25.0;
1f24022345d1 Fix merge problem
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616 return;
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617 }
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diff changeset
618
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diff changeset
619 #endif
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620
38
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621 void pressure_calculation(void)
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diff changeset
622 {
241
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diff changeset
623 if(global.I2C_SystemStatus != HAL_OK)
38
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624 return;
352
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diff changeset
625
1f24022345d1 Fix merge problem
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diff changeset
626 #ifdef SIMULATE_PRESSURE
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627 pressure_simulation();
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diff changeset
628 #else
38
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629 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015();
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parents: 351
diff changeset
630 #endif
38
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631 }
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632
186
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Jan Mulder <jlmulder@xs4all.nl>
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633 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void)
38
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634 {
335
c11ce8c885d3 Use average calculation for pressure: precondition was that pressure values jittered +- 10 HPa from one capture (once a second) to the other. Basically pressure is measured several times a second => using these values in an additional history calculation reduces the jitter down to +-1 per second
ideenmodellierer
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635 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
ideenmodellierer
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636 static uint8_t avgCnt = 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
ideenmodellierer
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637
38
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638 uint32_t local_D1; // ADC value of the pressure conversion
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639 uint32_t local_D2; // ADC value of the temperature conversion
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640 int32_t local_Px10; // compensated pressure value
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641 int32_t local_Tx100; // compensated temperature value
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642 int64_t local_dT; // int32_t, difference between actual and measured temperature
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643 int64_t local_OFF; // offset at actual temperature
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644 int64_t local_SENS; // sensitivity at actual temperature
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645
331
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ideenmodellierer
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646 float calc_pressure;
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647
38
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648 int64_t T2;
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649 int64_t OFF2;
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650 int64_t SENS2;
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651
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652 local_D1 = D1;
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653 local_D2 = D2;
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654
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655 local_dT = ((int64_t)local_D2) - ((int64_t)C[5]) * 256; //pow(2,8);
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656 local_OFF = ((int64_t)C[2]) * 65536 + local_dT * ((int64_t)C[4]) / 128; // pow(2,16), pow(2,7)
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657 local_SENS = ((int64_t)C[1]) * 32768 + local_dT * ((int64_t)C[3]) / 256; // pow(2,15), pow(2,8)
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658
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659 local_Tx100 = (int32_t)(2000 + (local_dT * ((int64_t)C[6])) / 8388608);// pow(2,23)
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660
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661
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662 if(local_Tx100 < 2000) // low temperature
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663 {
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664 T2 = 3 * local_dT;
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665 T2 *= local_dT;
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666 T2 /= 8589934592;
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667
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668 OFF2 = ((int64_t)local_Tx100) - 2000;
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669 OFF2 *= OFF2;
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670 OFF2 *= 3;
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671 OFF2 /= 2;
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672
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673 SENS2 = ((int64_t)local_Tx100) - 2000;
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674 SENS2 *= SENS2;
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675 SENS2 *= 5;
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676 SENS2 /= 8;
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677
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678 local_Tx100 -= (int32_t)T2;
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679 local_OFF -= OFF2;
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680 local_SENS -= SENS2;
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681 }
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682 else
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683 {
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684 T2 = 7 * local_dT;
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685 T2 *= local_dT;
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686 T2 /= 137438953472;
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687
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688 OFF2 = ((int64_t)local_Tx100) - 2000;
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689 OFF2 *= OFF2;
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690 OFF2 /= 16;
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691
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692 local_Tx100 -= (int32_t)T2;
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693 local_OFF -= OFF2;
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694 }
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695
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diff changeset
696 local_Px10 = (int32_t)(
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697 (((int64_t)((local_D1 * local_SENS) / 2097152)) - local_OFF)
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698 / 8192 );// )) / 10; // pow(2,21), pow(2,13)
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699
339
37f45300bc2e Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
parents: 335
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700 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
ideenmodellierer
parents: 335
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701 ambient_temperature += temperature_offset;
331
b4c578caaafb Added plausibility check for pressure values
ideenmodellierer
parents: 276
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702
688
8c92f7743e14 Added sanity check for temperature and pressure values:
Ideenmodellierer
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703 if(ambient_temperature < TEMPERATURE_MINIMUM)
8c92f7743e14 Added sanity check for temperature and pressure values:
Ideenmodellierer
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704 {
8c92f7743e14 Added sanity check for temperature and pressure values:
Ideenmodellierer
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705 ambient_temperature = 20.0;
8c92f7743e14 Added sanity check for temperature and pressure values:
Ideenmodellierer
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706 }
8c92f7743e14 Added sanity check for temperature and pressure values:
Ideenmodellierer
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707
331
b4c578caaafb Added plausibility check for pressure values
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708 calc_pressure = ((float)local_Px10) / 10;
339
37f45300bc2e Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
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709 calc_pressure += pressure_offset;
37f45300bc2e Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
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710
480
3fe9cc747c5c Code cleanup pressure plausibility check:
ideenmodellierer
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711 runningAvg = (avgCnt * runningAvg + calc_pressure) / (avgCnt + 1);
3fe9cc747c5c Code cleanup pressure plausibility check:
ideenmodellierer
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712 if (avgCnt < 10) /* build an average considering the last measurements to have a weight "1 of 10" */
3fe9cc747c5c Code cleanup pressure plausibility check:
ideenmodellierer
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713 { /* Main reason for this is the jitter of up to +-10 HPa in surface mode which is caused */
3fe9cc747c5c Code cleanup pressure plausibility check:
ideenmodellierer
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714 avgCnt++; /* by the measurement range of the sensor which is focused on under water pressure measurement */
331
b4c578caaafb Added plausibility check for pressure values
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715 }
480
3fe9cc747c5c Code cleanup pressure plausibility check:
ideenmodellierer
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diff changeset
716 ambient_pressure_mbar = runningAvg;
688
8c92f7743e14 Added sanity check for temperature and pressure values:
Ideenmodellierer
parents: 579
diff changeset
717
8c92f7743e14 Added sanity check for temperature and pressure values:
Ideenmodellierer
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718 if(ambient_pressure_mbar < PRESSURE_MINIMUM)
8c92f7743e14 Added sanity check for temperature and pressure values:
Ideenmodellierer
parents: 579
diff changeset
719 {
846
2ace67231c49 Consider pressure offset compensation in case of setting a default value:
Ideenmodellierer
parents: 688
diff changeset
720 ambient_pressure_mbar = 1000.0 + pressure_offset;
688
8c92f7743e14 Added sanity check for temperature and pressure values:
Ideenmodellierer
parents: 579
diff changeset
721 }
38
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722 }
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723
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724
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725 /* taken from AN520 by meas-spec.com dated 9. Aug. 2011
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726 * short and int are both 16bit according to AVR/GCC google results
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727 */
356
cb3870f79e9d Add Support for new end-2019 hardware:
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728 /*static uint8_t crc4(uint16_t n_prom[])
38
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729 {
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730 uint16_t cnt; // simple counter
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731 uint16_t n_rem; // crc reminder
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732 uint16_t crc_read; // original value of the crc
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733 uint8_t n_bit;
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734 n_rem = 0x00;
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735 crc_read=n_prom[7]; //save read CRC
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736 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0
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737 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes
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738 { // choose LSB or MSB
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739 if (cnt%2==1) n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF);
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740 else n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8);
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741 for (n_bit = 8; n_bit > 0; n_bit--)
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742 {
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743 if (n_rem & (0x8000))
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744 {
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745 n_rem = (n_rem << 1) ^ 0x3000;
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746 }
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747 else
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748 {
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749 n_rem = (n_rem << 1);
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750 }
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751 }
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752 }
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753 n_rem= (0x000F & (n_rem >> 12)); // // final 4-bit reminder is CRC code
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754 n_prom[7]=crc_read; // restore the crc_read to its original place
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755 return (n_rem ^ 0x00);
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756 }
356
cb3870f79e9d Add Support for new end-2019 hardware:
heinrichsweikamp
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757
38
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758 void test_calculation(void)
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759 {
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760 C1 = 29112;
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761 C2 = 26814;
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762 C3 = 19125;
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763 C4 = 17865;
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764 C5 = 32057;
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765 C6 = 31305;
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766
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767 C2_x_2p16 = C2 * 65536;
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768 C1_x_2p15 = C1 * 32768;
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diff changeset
769
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770 D1 = 4944364;
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771 D2 = 8198974;
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772 pressure_calculation() ;
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773 };
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774 */
339
37f45300bc2e Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
parents: 335
diff changeset
775 void pressure_set_offset (float pressureOffset, float temperatureOffset)
37f45300bc2e Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
parents: 335
diff changeset
776 {
37f45300bc2e Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
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diff changeset
777 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
ideenmodellierer
parents: 335
diff changeset
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
ideenmodellierer
parents: 335
diff changeset
779 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
ideenmodellierer
parents: 335
diff changeset
780 ambient_pressure_mbar += pressureOffset; /* apply new offset */
37f45300bc2e Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
parents: 335
diff changeset
781 init_surface_ring(1);
37f45300bc2e Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
parents: 335
diff changeset
782 }
38
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
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diff changeset
783
339
37f45300bc2e Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
parents: 335
diff changeset
784 pressure_offset = pressureOffset;
37f45300bc2e Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
parents: 335
diff changeset
785 temperature_offset = temperatureOffset;
37f45300bc2e Apply averaging to pressure measurement: In pre versions calculated pressure value jittered +/-10hPa. Since we measure the pressure several time a second but only use one value a second, calc average including not used values
ideenmodellierer
parents: 335
diff changeset
786 }
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
787
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
788