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annotate Small_CPU/Src/externalInterface.c @ 559:84a4e1200726

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Check if HW evaluation was performed: Devicedata is only requested once at startup and then every 10 minutes. To make sure that HW information related to compass and ADC are forwarded, two indicators have been added which may delay the respond by one second.
author Ideenmodellierer
date Sun, 15 Nov 2020 19:52:03 +0100
parents 3328189786e7
children 011d8f9f5ddb
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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 }
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114 }
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115 return retval;
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116 }
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117 float externalInterface_CalculateADCValue(uint8_t channel)
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118 {
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119 int32_t rawvalue = 0;
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120 float retValue = 0.0;
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121 if(channel < MAX_ADC_CHANNEL)
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122 {
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123
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124 rawvalue = ((recBuf[0] << 16) | (recBuf[1] << 8) | (recBuf[2]));
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125
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126 switch(recBuf[3] & 0x0C) /* confbyte => Resolution bits*/
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127 {
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128 case ADC_RESOLUTION_16BIT: rawvalue = rawvalue >> 8; /* only 2 databytes received shift out confbyte*/
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129 if(rawvalue & (0x1 << (ADC_RESOLUTION_16BIT_VALUE-1))) /* MSB set => negative number */
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130 {
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131 rawvalue |= 0xFFFF0000; /* set MSB for int32 */
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132 }
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133 else
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134 {
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135 rawvalue &= 0x0000FFFF;
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136 }
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137 externalChannel_mV[channel] = ADC_REF_VOLTAGE_MV * 2.0 / (float) pow(2,ADC_RESOLUTION_16BIT_VALUE); /* calculate bit resolution */
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138 break;
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139 case ADC_RESOLUTION_18BIT: if(rawvalue & (0x1 << (ADC_RESOLUTION_18BIT_VALUE-1))) /* MSB set => negative number */
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140 {
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141 rawvalue |= 0xFFFE0000; /* set MSB for int32 */
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142 }
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143 externalChannel_mV[channel] = ADC_REF_VOLTAGE_MV * 2.0 / (float) pow(2,ADC_RESOLUTION_18BIT_VALUE); /* calculate bit resolution */
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144 break;
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145 default: rawvalue = 0;
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146 break;
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147 }
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148 externalChannel_mV[channel] = externalChannel_mV[channel] * rawvalue / ADC_GAIN_8_VALUE;
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149 retValue = externalChannel_mV[channel];
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150 }
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151 return retValue;
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152 }
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153 float getExternalInterfaceChannel(uint8_t channel)
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154 {
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155 float retval = 0;
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156
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157 if(channel < MAX_ADC_CHANNEL)
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158 {
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159 retval = externalChannel_mV[channel];
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160 }
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161 return retval;
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162 }