annotate Small_CPU/Src/pressure.c @ 334:143fe85f82a2 v1.5.0 release

building a 1.5
author heinrichsweikamp
date Sun, 04 Aug 2019 11:01:06 +0200
parents b4c578caaafb
children c11ce8c885d3
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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 #define PRESSURE_HISTORY_SIZE (8u)
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50 #define PRESSURE_JUMP_VALID_MBAR (500.0f) /* values are measure several times a second => jumps > 5m very unlikely */
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51
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52 static uint16_t get_ci_by_coef_num(uint8_t coef_num);
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53 //void pressure_calculation_new(void);
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54 //void pressure_calculation_old(void);
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55 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void);
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56 static uint8_t crc4(uint16_t n_prom[]);
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58 static HAL_StatusTypeDef pressure_sensor_get_data(void);
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59 static uint32_t get_adc(void);
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60 uint8_t pressureSensorInitSuccess = 0;
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61
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62 static uint16_t C[8] = { 1 };
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63 static uint32_t D1 = 1;
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64 static uint32_t D2 = 1;
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65 static uint8_t n_crc;
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66
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67 static int64_t C5_x_2p8 = 1;
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68 static int64_t C2_x_2p16 = 1;
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69 static int64_t C1_x_2p15 = 1;
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70
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71 /*
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72 short C2plus10000 = -1;
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73 short C3plus200 = -1;
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74 short C4minus250 = -1;
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75 short UT1 = -1;
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76 short C6plus100 = -1;
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77 */
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78
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79 static float ambient_temperature = 0;
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80 static float ambient_pressure_mbar = 1000.0;
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81 static float surface_pressure_mbar = 1000.0;
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82 static float surface_ring_mbar[31] = { 0 };
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83
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84 static float pressure_history_mbar[PRESSURE_HISTORY_SIZE];
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85
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86 uint8_t secondCounterSurfaceRing = 0;
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87
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88 float get_temperature(void)
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89 {
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90 return ambient_temperature;
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91 }
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92
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93 float get_pressure_mbar(void)
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94 {
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95 return ambient_pressure_mbar;
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96 }
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97
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98 float get_surface_mbar(void)
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99 {
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100 return surface_pressure_mbar;
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101 }
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102
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103
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104 void init_surface_ring(void)
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105 {
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106 surface_ring_mbar[0] = 0;
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107 for(int i=1; i<31; i++)
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108 surface_ring_mbar[i] = ambient_pressure_mbar;
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109 surface_pressure_mbar = ambient_pressure_mbar;
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110 }
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111
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112 void init_pressure_history(void)
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113 {
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114 for(int i=0; i<PRESSURE_HISTORY_SIZE; i++)
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115 {
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116 pressure_history_mbar[i] = 1000.0;
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117 }
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118 }
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119
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120 /* the ring has one place with 0
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121 * after that comes the oldest value
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122 * the new pressure is written in this hole
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123 * the oldest value is read and then the new hole
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124 */
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125 void update_surface_pressure(uint8_t call_rhythm_seconds)
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126 {
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127 secondCounterSurfaceRing += call_rhythm_seconds;
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128
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129 if(secondCounterSurfaceRing < 60)
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130 return;
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131
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132 secondCounterSurfaceRing = 0;
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133
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134 if(is_init_pressure_done())
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135 {
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136 int hole;
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137 for(hole=30;hole>0;hole--)
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138 if(surface_ring_mbar[hole] == 0) { break; }
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139
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140 surface_ring_mbar[hole] = ambient_pressure_mbar;
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141
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142 hole++;
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143 if(hole > 30)
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144 hole = 0;
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145 surface_pressure_mbar = surface_ring_mbar[hole];
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146 surface_ring_mbar[hole] = 0;
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147 }
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148 }
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149
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150 #ifdef DEMOMODE
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151 float demo_modify_temperature_helper(float bottom_mbar_diff_to_surface)
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152 {
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153 const float temperature_surface = 31.0;
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154 const float temperature_bottom = 14.0;
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155
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156 const float temperature_difference = temperature_bottom - temperature_surface;
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157
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158 // range 0.0 - 1.0
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159 float position_now = (ambient_pressure_mbar - surface_pressure_mbar) / bottom_mbar_diff_to_surface;
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160
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161 if(position_now <= 0)
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162 return temperature_surface;
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163
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164 if(position_now >= 1)
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165 return temperature_bottom;
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166
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167 return temperature_surface + (temperature_difference * position_now);
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168 }
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169
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170
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171 uint32_t demo_modify_temperature_and_pressure(int32_t divetime_in_seconds, uint8_t subseconds, float ceiling_mbar)
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172 {
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173
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174 const float descent_rate = 4000/60;
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175 const float ascent_rate = 1000/60;
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176 const uint32_t seconds_descend = (1 * 60) + 30;
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177 const uint32_t turbo_seconds_at_bottom_start = (0 * 60) + 0;
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178 const uint32_t seconds_descend_and_bottomtime = seconds_descend + turbo_seconds_at_bottom_start + (2 * 60) + 0;
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179 uint32_t time_elapsed_in_seconds;
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180 static float ambient_pressure_mbar_memory = 0;
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181 static uint32_t time_last_call = 0;
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182
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183 if(divetime_in_seconds <= seconds_descend)
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184 {
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185 ambient_pressure_mbar = (divetime_in_seconds * descent_rate) + ((float)(subseconds) * descent_rate) + surface_pressure_mbar;
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186 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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187
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188 time_last_call = divetime_in_seconds;
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189 return 0;
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190 }
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191 else
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192 if(divetime_in_seconds <= seconds_descend + turbo_seconds_at_bottom_start)
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193 {
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194 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar;
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195 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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196 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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197 time_last_call = divetime_in_seconds;
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198 return turbo_seconds_at_bottom_start;
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199 }
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200 else
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201 if(divetime_in_seconds <= seconds_descend_and_bottomtime)
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202 {
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203 ambient_pressure_mbar = (seconds_descend * descent_rate) + surface_pressure_mbar;
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204 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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205 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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206 time_last_call = divetime_in_seconds;
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207 return 0;
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208 }
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209 else
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210 {
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211 time_elapsed_in_seconds = divetime_in_seconds - time_last_call;
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212 ambient_pressure_mbar = ambient_pressure_mbar_memory - time_elapsed_in_seconds * ascent_rate;
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213
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214 if(ambient_pressure_mbar < surface_pressure_mbar)
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215 ambient_pressure_mbar = surface_pressure_mbar;
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216 else if(ambient_pressure_mbar < ceiling_mbar)
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217 ambient_pressure_mbar = ceiling_mbar;
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218
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219 ambient_temperature = demo_modify_temperature_helper(descent_rate * seconds_descend);
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220 ambient_pressure_mbar_memory = ambient_pressure_mbar;
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221 time_last_call = divetime_in_seconds;
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222 return 0;
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223 }
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224 }
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225 #endif
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226
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227 uint8_t is_init_pressure_done(void)
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228 {
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229 return pressureSensorInitSuccess;
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230 }
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231
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232 uint8_t init_pressure(void)
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233 {
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234 uint8_t buffer[1];
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235 buffer[0] = 0x1e;
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236 uint8_t retValue = 0xFF;
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237
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238 pressureSensorInitSuccess = false;
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239 init_pressure_history();
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240
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241 /* Send reset request to pressure sensor */
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242 retValue = I2C_Master_Transmit( DEVICE_PRESSURE, buffer, 1);
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243 if(retValue != HAL_OK)
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244 {
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245 return (HAL_StatusTypeDef)retValue;
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246 }
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247 HAL_Delay(3);
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248
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249 for(uint8_t i=0;i<8;i++)
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250 {
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251 C[i] = get_ci_by_coef_num(i);
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252 }
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253 n_crc = crc4(C); // no evaluation at the moment hw 151026
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254
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255 C5_x_2p8 = C[5] * 256;
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256 C2_x_2p16 = C[2] * 65536;
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257 C1_x_2p15 = C[1] * 32768;
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258
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259 if(global.I2C_SystemStatus == HAL_OK)
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260 {
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261 pressureSensorInitSuccess = 1;
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262 retValue = pressure_update();
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263
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264 }
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265 return retValue;
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266 }
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267
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268
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269 static uint32_t get_adc(void)
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270 {
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271 uint8_t buffer[1];
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272 uint8_t resivebuf[4];
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273 uint32_t answer = 0;
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274
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275 buffer[0] = 0x00; // Get ADC
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276 I2C_Master_Transmit( DEVICE_PRESSURE, buffer, 1);
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277 I2C_Master_Receive( DEVICE_PRESSURE, resivebuf, 4);
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278 resivebuf[3] = 0;
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279 answer = 256*256 *(uint32_t)resivebuf[0] + 256 * (uint32_t)resivebuf[1] + (uint32_t)resivebuf[2];
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280
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281 return answer;
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282 }
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283
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284
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285 static uint16_t get_ci_by_coef_num(uint8_t coef_num)
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286 {
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287 uint8_t resivebuf[2];
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288
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289 uint8_t cmd = CMD_PROM_RD+coef_num*2;
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290 I2C_Master_Transmit( DEVICE_PRESSURE, &cmd, 1);
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291 I2C_Master_Receive( DEVICE_PRESSURE, resivebuf, 2);
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292 return (256*(uint16_t)resivebuf[0]) + (uint16_t)resivebuf[1];
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293 }
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294
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295
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296
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297 uint8_t pressure_update(void)
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298 {
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299 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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300
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301 statusReturn = pressure_sensor_get_data();
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302 pressure_calculation();
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303 return (uint8_t)statusReturn;
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304 }
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305
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306 /* Switch between pressure and temperature measurement with every successful read operation */
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307 void pressure_update_alternating(void)
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308 {
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309 static uint8_t getTemperature= 0;
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310
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311 if(getTemperature)
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312 {
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313 if(pressure_sensor_get_temperature_raw() == HAL_OK)
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314 {
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315 getTemperature = 0;
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316 }
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317 }
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318 else
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319 {
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320 if(pressure_sensor_get_pressure_raw() == HAL_OK)
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321 {
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322 getTemperature = 1;
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323 }
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324 }
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325 pressure_calculation();
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326 return;
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327 }
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328
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329 static uint32_t pressure_sensor_get_one_value(uint8_t cmd, HAL_StatusTypeDef *statusReturn)
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330 {
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331 uint8_t command = CMD_ADC_CONV + cmd;
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332 HAL_StatusTypeDef statusReturnTemp = HAL_TIMEOUT;
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333
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334 statusReturnTemp = I2C_Master_Transmit( DEVICE_PRESSURE, &command, 1);
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335
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336 if(statusReturn)
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337 {
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338 *statusReturn = statusReturnTemp;
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339 }
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340
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341 switch (cmd & 0x0f) // wait necessary conversion time
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342 {
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343 case CMD_ADC_256 : HAL_Delay(1); break;
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344 case CMD_ADC_512 : HAL_Delay(3); break;
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345 case CMD_ADC_1024: HAL_Delay(4); break;
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346 case CMD_ADC_2048: HAL_Delay(6); break;
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347 case CMD_ADC_4096: HAL_Delay(10); break;
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348 }
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349 return get_adc();
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350 }
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351
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352
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353 static HAL_StatusTypeDef pressure_sensor_get_data(void)
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354 {
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355 uint32_t requestedValue = 0;
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356 HAL_StatusTypeDef statusReturn1 = HAL_TIMEOUT;
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357 HAL_StatusTypeDef statusReturn2 = HAL_TIMEOUT;
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358
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359
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360
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361 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn2);
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362 if (statusReturn2 == HAL_OK)
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363 {
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364 D2 = requestedValue;
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365 }
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366
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367 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn1);
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368 if (statusReturn1 == HAL_OK)
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369 {
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370 D1 = requestedValue;
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371 }
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372 if(statusReturn2 > statusReturn1) // if anything is not HAL_OK (0x00) or worse
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373 return statusReturn2;
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374 else
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375 return statusReturn1;
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376 }
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377
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378
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379 HAL_StatusTypeDef pressure_sensor_get_pressure_raw(void)
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380 {
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381 uint32_t requestedValue = 0;
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382 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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383
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384 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D1 + CMD_ADC_1024, &statusReturn);
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385 if (statusReturn == HAL_OK)
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386 {
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387 D1 = requestedValue;
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388 }
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389
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390 return statusReturn;
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391 }
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392
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393
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394 HAL_StatusTypeDef pressure_sensor_get_temperature_raw(void)
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395 {
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396 uint32_t requestedValue = 0;
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397 HAL_StatusTypeDef statusReturn = HAL_TIMEOUT;
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398
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399 requestedValue = pressure_sensor_get_one_value(CMD_ADC_D2 + CMD_ADC_1024, &statusReturn);
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400 if (statusReturn == HAL_OK)
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401 {
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402 D2 = requestedValue;
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403 }
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404 return statusReturn;
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405 }
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406
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407
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408 void pressure_calculation(void)
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409 {
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410 if(global.I2C_SystemStatus != HAL_OK)
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411 return;
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412
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413 pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015();
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414 }
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415
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416 static uint8_t pressure_plausible(float pressurevalue)
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417 {
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418 static uint8_t pressurewriteindex = 0;
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419 uint8_t retval = 0;
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420 uint8_t index;
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421 float pressure_average = 0;
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422
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423 for(index = 0; index < PRESSURE_HISTORY_SIZE; index++)
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424 {
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425 pressure_average += pressure_history_mbar[index];
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426 }
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427 pressure_average /= PRESSURE_HISTORY_SIZE;
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428 if(pressure_average == 1000.0) /* first pressure calculation */
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429 {
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430 if(fabs(pressurevalue - pressure_average) < 11000.0) /* just in case a reset occure during dive assume value equal < 100m as valid */
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431 {
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432 for(index = 0; index < PRESSURE_HISTORY_SIZE; index++)
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433 {
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434 pressure_history_mbar[index] = pressurevalue; /* set history to current value */
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435 retval = 1;
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436 }
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437 }
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438 }
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439 else
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440 {
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441 if(fabs(pressurevalue - pressure_average) < PRESSURE_JUMP_VALID_MBAR)
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442 pressure_history_mbar[pressurewriteindex++] = pressurevalue;
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443 pressurewriteindex &= 0x7; /* wrap around if necessary */
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444 retval = 1;
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445 }
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446
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447 return retval;
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448 }
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449
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450 static void pressure_calculation_AN520_004_mod_MS5803_30BA__09_2015(void)
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451 {
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452 uint32_t local_D1; // ADC value of the pressure conversion
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453 uint32_t local_D2; // ADC value of the temperature conversion
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454 int32_t local_Px10; // compensated pressure value
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455 int32_t local_Tx100; // compensated temperature value
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456 int64_t local_dT; // int32_t, difference between actual and measured temperature
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457 int64_t local_OFF; // offset at actual temperature
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458 int64_t local_SENS; // sensitivity at actual temperature
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459
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460 float calc_pressure;
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461
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462 int64_t T2;
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463 int64_t OFF2;
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464 int64_t SENS2;
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465
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466 local_D1 = D1;
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467 local_D2 = D2;
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468
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469 local_dT = ((int64_t)local_D2) - ((int64_t)C[5]) * 256; //pow(2,8);
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470 local_OFF = ((int64_t)C[2]) * 65536 + local_dT * ((int64_t)C[4]) / 128; // pow(2,16), pow(2,7)
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471 local_SENS = ((int64_t)C[1]) * 32768 + local_dT * ((int64_t)C[3]) / 256; // pow(2,15), pow(2,8)
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472
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473 local_Tx100 = (int32_t)(2000 + (local_dT * ((int64_t)C[6])) / 8388608);// pow(2,23)
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474
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475
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476 if(local_Tx100 < 2000) // low temperature
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477 {
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478 T2 = 3 * local_dT;
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479 T2 *= local_dT;
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480 T2 /= 8589934592;
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481
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482 OFF2 = ((int64_t)local_Tx100) - 2000;
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483 OFF2 *= OFF2;
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484 OFF2 *= 3;
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485 OFF2 /= 2;
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486
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487 SENS2 = ((int64_t)local_Tx100) - 2000;
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488 SENS2 *= SENS2;
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489 SENS2 *= 5;
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490 SENS2 /= 8;
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491
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492 local_Tx100 -= (int32_t)T2;
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493 local_OFF -= OFF2;
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494 local_SENS -= SENS2;
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495 }
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496 else
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497 {
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498 T2 = 7 * local_dT;
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499 T2 *= local_dT;
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500 T2 /= 137438953472;
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501
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502 OFF2 = ((int64_t)local_Tx100) - 2000;
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503 OFF2 *= OFF2;
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504 OFF2 /= 16;
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505
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506 local_Tx100 -= (int32_t)T2;
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507 local_OFF -= OFF2;
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508 }
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509
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510 local_Px10 = (int32_t)(
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511 (((int64_t)((local_D1 * local_SENS) / 2097152)) - local_OFF)
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512 / 8192 );// )) / 10; // pow(2,21), pow(2,13)
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513
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514 ambient_temperature = ((float)local_Tx100) / 100;
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515
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516 calc_pressure = ((float)local_Px10) / 10;
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517 if(pressure_plausible(calc_pressure))
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518 {
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519 ambient_pressure_mbar = calc_pressure;
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520 }
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521 }
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522
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523
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524 /*
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525 void pressure_calculation_new(void)
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526 {
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527 #define POW2_8 (256)
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528 #define POW2_17 (131072)
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529 #define POW2_6 (64)
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530 #define POW2_16 (65536)
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531 #define POW2_7 (128)
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532 #define POW2_23 (8388608)
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533 #define POW2_21 (2097152)
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534 #define POW2_15 (32768)
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535 #define POW2_13 (8192)
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536 #define POW2_37 (137438953472)
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537 #define POW2_4 (16)
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538 #define POW2_33 (8589934592)
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539 #define POW2_3 (8)
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540
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541 int32_t P; // compensated pressure value
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542 int32_t T; // compensated temperature value
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543 int32_t dT; // difference between actual and measured temperature
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544 int64_t OFF; // offset at actual temperature
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545 int64_t SENS;
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546
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diff changeset
547 int32_t T2;
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diff changeset
548 int64_t OFF2;
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549 int64_t SENS2;
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550
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551 dT = ((int32_t)D2) - ((int32_t)C[5]) * POW2_8;
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552 OFF = ((int64_t)C[2]) * POW2_16 + ((int64_t)dT) * ((int64_t)C[4]) / POW2_7;
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553 SENS = ((int64_t)C[1]) * POW2_15 + ((int64_t)dT) * ((int64_t)C[3]) / POW2_8;
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554
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555 T = 2000 + (dT * ((int32_t)C[6])) / POW2_23;
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556
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parents:
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557
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parents:
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558 if(T < 2000) // low temperature
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559 {
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560 T2 = 3 * dT * dT;
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561 T2 /= POW2_33;
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562 OFF2 = ((int64_t)T) - 2000;
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563 OFF2 *= OFF2;
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564 OFF2 *= 3;
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565 OFF2 /= 2;
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566 SENS2 = ((int64_t)T) - 2000;
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567 SENS2 *= SENS2;
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568 SENS2 *= 5;
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569 SENS2 /= POW2_3;
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570 }
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571 else // high temperature
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572 {
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573 T2 = 7 * dT * dT;
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574 T2 /= POW2_37;
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575 OFF2 = ((int64_t)T) - 2000;
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576 OFF2 *= OFF2;
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577 OFF2 /= POW2_4;
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578 SENS2 = 0;
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579 }
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580
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parents:
diff changeset
581 T = T - T2;
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582 OFF = OFF - OFF2;
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583 SENS = SENS - SENS2;
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584
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585 P = (int32_t)(((((int64_t)D1) * SENS) / POW2_21 - OFF) / POW2_13);
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586
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587 ambient_temperature = ((float)T) / 100;
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588 ambient_pressure_mbar = ((float)P) / 10;
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589 }
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590 */
38
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591
186
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Jan Mulder <jlmulder@xs4all.nl>
parents: 38
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592 /*
38
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heinrichsweikamp
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593 void pressure_calculation_old(void) {
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594 //
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595 double ambient_temperature_centigrad = 0;
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heinrichsweikamp
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596 double ambient_pressure_decimbar = 0;
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597
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parents:
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598 // static for debug
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599 static int64_t dt = 0;
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600 static int64_t temp = 0;
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601 static int64_t ms_off = 0;
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602 static int64_t sens = 0;
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603 //
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604 static int64_t ms_off2 = 0;
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605 static int64_t sens2 = 0;
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606 static int64_t t2 = 0;
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607
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608 if((D2 == 0) || (D1 == 0))
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609 return;
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610 //
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611
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612 // dT = D2 - C[5] * POW2_8;
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613 // T = 2000 + (dT * C[6]) / POW2_23;
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614 dt = (int64_t)D2 - C5_x_2p8;
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615 //temp ; // in 10 milliGrad Celcius
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616 ambient_temperature_centigrad = 2000 + dt * C[6] / 8388608;
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617
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618
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619 if(ambient_temperature_centigrad < 2000) // low temperature
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620 {
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diff changeset
621 t2 = 3 * dt;
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622 t2 *= dt;
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623 t2 /= 8589934592;
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624 ms_off2 = ambient_temperature_centigrad - 2000;
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625 ms_off2 *= ms_off2;
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626 sens2 = ms_off2;
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627 ms_off2 *= 3;
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628 ms_off2 /= 2;
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629 sens2 *= 5;
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630 sens2 /= 8;
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631 }
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632 else // high temperature
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633 {
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634 t2 = 7 * dt;
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635 t2 *= dt;
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636 t2 /= 137438953472;
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637 ms_off2 = ambient_temperature_centigrad - 2000;
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638 ms_off2 *= ms_off2;
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639 ms_off2 /= 16;
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640 sens2 = 0;
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641 }
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642
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643
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parents:
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644 //
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645
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646 // pressure
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647 // OFF = C[2] * POW2_16 + dT * C[4] / POW2_7;
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648 // SENS = C[1] * POW2_15 + dT * C[3] / POW2_8;
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649 ms_off = C[4] * dt;
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650 ms_off /= 128;
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651 ms_off += C2_x_2p16;
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diff changeset
652 //
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653 sens = C[3] * dt;
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654 sens /= 256;
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655 sens += C1_x_2p15;
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656
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657 // 2nd order correction
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diff changeset
658 ambient_temperature_centigrad -= t2;
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659 ms_off -= ms_off2;
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diff changeset
660 sens -= sens2;
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661
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662 ambient_temperature = ambient_temperature_centigrad / 100;
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663 // P = (D1 * SENS / POW2_21 - OFF) / POW2_13;
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diff changeset
664 temp = D1 * sens;
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diff changeset
665 temp /= 2097152;
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666 temp -= ms_off;
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667 temp /= 8192;
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668 ambient_pressure_decimbar = temp; // to float/double
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669 ambient_pressure_mbar = ambient_pressure_decimbar / 10;
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670 }
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diff changeset
671 */
38
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diff changeset
672
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673
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674 /* taken from AN520 by meas-spec.com dated 9. Aug. 2011
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675 * short and int are both 16bit according to AVR/GCC google results
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676 */
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diff changeset
677 static uint8_t crc4(uint16_t n_prom[])
38
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678 {
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679 uint16_t cnt; // simple counter
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680 uint16_t n_rem; // crc reminder
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681 uint16_t crc_read; // original value of the crc
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682 uint8_t n_bit;
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683 n_rem = 0x00;
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684 crc_read=n_prom[7]; //save read CRC
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685 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0
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686 for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes
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687 { // choose LSB or MSB
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688 if (cnt%2==1) n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF);
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689 else n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8);
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690 for (n_bit = 8; n_bit > 0; n_bit--)
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691 {
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692 if (n_rem & (0x8000))
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693 {
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694 n_rem = (n_rem << 1) ^ 0x3000;
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695 }
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696 else
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697 {
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698 n_rem = (n_rem << 1);
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699 }
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700 }
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701 }
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702 n_rem= (0x000F & (n_rem >> 12)); // // final 4-bit reminder is CRC code
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703 n_prom[7]=crc_read; // restore the crc_read to its original place
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704 return (n_rem ^ 0x00);
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705 }
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706 /*
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707 void test_calculation(void)
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708 {
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diff changeset
709 C1 = 29112;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
710 C2 = 26814;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
711 C3 = 19125;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
712 C4 = 17865;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
713 C5 = 32057;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
714 C6 = 31305;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
715
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
716 C2_x_2p16 = C2 * 65536;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
717 C1_x_2p15 = C1 * 32768;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
718
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
719 D1 = 4944364;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
720 D2 = 8198974;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
721 pressure_calculation() ;
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
722 };
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
723 */
5f11787b4f42 include in ostc4 repository
heinrichsweikamp
parents:
diff changeset
724