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annotate Small_CPU/Src/externalInterface.c @ 627:189f945ae4ba

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Improve in / out of focus transitions: Added a function which detects if the yaw value changed significant while in focus state. This event is typically pointing to a arm movment => diver is no longer focussing at the OSTC. Improve custom view mapping: Added a direction indicator to the focus distance value (now +/- values instead of absolut values before). With this modification custom view sectors may have the double size and are threrfore easier to be controlled.
author Ideenmodellierer
date Fri, 12 Feb 2021 21:43:27 +0100
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 }
559
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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 {
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167 retval = externalChannel_mV[channel];
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168 }
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169 return retval;
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170 }