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annotate Small_CPU/Src/externalInterface.c @ 657:9513a92b293b

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author heinrichs weikamp
date Mon, 26 Apr 2021 15:03:04 +0200
parents 011d8f9f5ddb
children 1b995079c045
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1 /**
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2 ******************************************************************************
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3 * @file externalInterface.c
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4 * @author heinrichs weikamp gmbh
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5 * @version V0.0.1
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6 * @date 07-Nov-2020
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7 * @brief Interface functionality to proceed external analog signal via i2c connection
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8 *
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9 @verbatim
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10 ==============================================================================
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11 ##### stm32f4xx_hal_i2c.c modification #####
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12 ==============================================================================
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13 The LTC2942 requires an repeated start condition without stop condition
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14 for data reception.
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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) 2014 heinrichs weikamp</center></h2>
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21 *
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22 ******************************************************************************
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23 */
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24 /* Includes ------------------------------------------------------------------*/
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25
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26 #include <math.h>
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27 #include "i2c.h"
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28 #include "externalInterface.h"
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29 #include "scheduler.h"
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30
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31 extern SGlobal global;
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32
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33 #define ADC_ANSWER_LENGTH (5u) /* 3424 will provide addr + 4 data bytes */
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34 #define ADC_TIMEOUT (10u) /* conversion stuck for unknown reason => restart */
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35 #define ADC_REF_VOLTAGE_MV (2048.0f) /* reference voltage of MPC3424*/
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36
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37 #define ADC_START_CONVERSION (0x80)
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38 #define ADC_GAIN_4 (0x02)
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39 #define ADC_GAIN_4_VALUE (4.0f)
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40 #define ADC_GAIN_8 (0x03)
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41 #define ADC_GAIN_8_VALUE (8.0f)
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42 #define ADC_RESOLUTION_16BIT (0x08)
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43 #define ADC_RESOLUTION_16BIT_VALUE (16u)
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44 #define ADC_RESOLUTION_18BIT (0x0C)
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45 #define ADC_RESOLUTION_18BIT_VALUE (18u)
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46
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47 #define ANSWER_CONFBYTE_INDEX (4u)
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48
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49 static uint8_t activeChannel = 0; /* channel which is in request */
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50 static uint8_t recBuf[ADC_ANSWER_LENGTH];
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51 static uint8_t timeoutCnt = 0;
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52 static uint8_t externalInterfacePresent = 0;
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53
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54 float externalChannel_mV[MAX_ADC_CHANNEL];
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55
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56
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57 void externalInterface_Init(void)
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58 {
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59 activeChannel = 0;
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60 timeoutCnt = 0;
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61 externalInterfacePresent = 0;
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62 if(externalInterface_StartConversion(activeChannel) == HAL_OK)
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63 {
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64 externalInterfacePresent = 1;
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65 global.deviceDataSendToMaster.hw_Info.extADC = 1;
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66 }
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67 global.deviceDataSendToMaster.hw_Info.checkADC = 1;
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68 }
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69
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70
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71 uint8_t externalInterface_StartConversion(uint8_t channel)
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72 {
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73 uint8_t retval = 0;
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74 uint8_t confByte = 0;
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75
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76 if(channel < MAX_ADC_CHANNEL)
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77 {
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78 confByte = ADC_START_CONVERSION | ADC_RESOLUTION_16BIT | ADC_GAIN_8;
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79 confByte |= channel << 5;
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80 retval = I2C_Master_Transmit(DEVICE_EXTERNAL_ADC, &confByte, 1);
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81 }
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82 return retval;
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83 }
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84
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85 /* Check if conversion is done and trigger measurement of next channel */
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86 uint8_t externalInterface_ReadAndSwitch()
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87 {
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88 uint8_t retval = EXTERNAL_ADC_NO_DATA;
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89
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90 if(externalInterfacePresent)
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91 {
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92 if(I2C_Master_Receive(DEVICE_EXTERNAL_ADC, recBuf, ADC_ANSWER_LENGTH) == HAL_OK)
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93 {
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94 if((recBuf[ANSWER_CONFBYTE_INDEX] & ADC_START_CONVERSION) == 0) /* !ready set => received data contains new value */
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95 {
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96 retval = activeChannel; /* return channel number providing new data */
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97 activeChannel++;
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98 if(activeChannel == MAX_ADC_CHANNEL)
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99 {
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100 activeChannel = 0;
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101 }
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102 externalInterface_StartConversion(activeChannel);
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103 timeoutCnt = 0;
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104 }
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105 else
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106 {
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107 if(timeoutCnt++ >= ADC_TIMEOUT)
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108 {
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109 externalInterface_StartConversion(activeChannel);
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110 timeoutCnt = 0;
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111 }
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112 }
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113 }
581
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114 else /* take also i2c bus disturb into account */
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115 {
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116 if(timeoutCnt++ >= ADC_TIMEOUT)
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117 {
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118 externalInterface_StartConversion(activeChannel);
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119 timeoutCnt = 0;
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120 }
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121 }
554
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122 }
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123 return retval;
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124 }
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125 float externalInterface_CalculateADCValue(uint8_t channel)
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126 {
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127 int32_t rawvalue = 0;
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128 float retValue = 0.0;
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129 if(channel < MAX_ADC_CHANNEL)
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130 {
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131
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132 rawvalue = ((recBuf[0] << 16) | (recBuf[1] << 8) | (recBuf[2]));
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133
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134 switch(recBuf[3] & 0x0C) /* confbyte => Resolution bits*/
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135 {
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136 case ADC_RESOLUTION_16BIT: rawvalue = rawvalue >> 8; /* only 2 databytes received shift out confbyte*/
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137 if(rawvalue & (0x1 << (ADC_RESOLUTION_16BIT_VALUE-1))) /* MSB set => negative number */
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138 {
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139 rawvalue |= 0xFFFF0000; /* set MSB for int32 */
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140 }
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141 else
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142 {
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143 rawvalue &= 0x0000FFFF;
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144 }
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145 externalChannel_mV[channel] = ADC_REF_VOLTAGE_MV * 2.0 / (float) pow(2,ADC_RESOLUTION_16BIT_VALUE); /* calculate bit resolution */
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146 break;
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147 case ADC_RESOLUTION_18BIT: if(rawvalue & (0x1 << (ADC_RESOLUTION_18BIT_VALUE-1))) /* MSB set => negative number */
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148 {
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149 rawvalue |= 0xFFFE0000; /* set MSB for int32 */
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150 }
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151 externalChannel_mV[channel] = ADC_REF_VOLTAGE_MV * 2.0 / (float) pow(2,ADC_RESOLUTION_18BIT_VALUE); /* calculate bit resolution */
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152 break;
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153 default: rawvalue = 0;
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154 break;
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155 }
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156 externalChannel_mV[channel] = externalChannel_mV[channel] * rawvalue / ADC_GAIN_8_VALUE;
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157 retValue = externalChannel_mV[channel];
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158 }
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159 return retValue;
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160 }
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161 float getExternalInterfaceChannel(uint8_t channel)
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162 {
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163 float retval = 0;
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164
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165 if(channel < MAX_ADC_CHANNEL)
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166 {
3328189786e7 Added external ADC interface functionality (MCP3424):
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167 retval = externalChannel_mV[channel];
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168 }
3328189786e7 Added external ADC interface functionality (MCP3424):
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169 return retval;
3328189786e7 Added external ADC interface functionality (MCP3424):
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170 }