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annotate Small_CPU/Src/externalInterface.c @ 691:52d68cf9994c Betatest

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Improvment external interface usage: The previous implementation of the external interface was straight forward for ADC and Co2 UART usage. The new implementation provides the possibility to configurate the behavior of the external interface. e.g. Switching of external3,3V and ADC separatly and selection of UART protocol.
author Ideenmodellierer
date Fri, 05 Aug 2022 15:26:28 +0200
parents 1b995079c045
children f1b40364b0af
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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 #include "uart.h"
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31 #include "data_exchange.h"
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32
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33 extern SGlobal global;
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34 extern UART_HandleTypeDef huart1;
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35
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36 #define ADC_ANSWER_LENGTH (5u) /* 3424 will provide addr + 4 data bytes */
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37 #define ADC_TIMEOUT (10u) /* conversion stuck for unknown reason => restart */
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38 #define ADC_REF_VOLTAGE_MV (2048.0f) /* reference voltage of MPC3424*/
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39
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40 #define ADC_START_CONVERSION (0x80)
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41 #define ADC_GAIN_4 (0x02)
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42 #define ADC_GAIN_4_VALUE (4.0f)
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43 #define ADC_GAIN_8 (0x03)
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44 #define ADC_GAIN_8_VALUE (8.0f)
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45 #define ADC_RESOLUTION_16BIT (0x08)
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46 #define ADC_RESOLUTION_16BIT_VALUE (16u)
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47 #define ADC_RESOLUTION_18BIT (0x0C)
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48 #define ADC_RESOLUTION_18BIT_VALUE (18u)
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49
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50 #define ANSWER_CONFBYTE_INDEX (4u)
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51
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52 static uint8_t activeChannel = 0; /* channel which is in request */
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53 static uint8_t recBuf[ADC_ANSWER_LENGTH];
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54 static uint8_t timeoutCnt = 0;
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55 static uint8_t externalInterfacePresent = 0;
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56
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57 float externalChannel_mV[MAX_ADC_CHANNEL];
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58 static uint8_t externalV33_On = 0;
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59 static uint8_t externalADC_On = 0;
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60 static uint16_t externalCO2Value;
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61 static uint16_t externalCO2SignalStrength;
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62 static uint16_t externalCO2Status = 0;
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63
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64
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65 void externalInterface_Init(void)
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66 {
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67 activeChannel = 0;
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68 timeoutCnt = 0;
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69 externalInterfacePresent = 0;
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70 if(externalInterface_StartConversion(activeChannel) == HAL_OK)
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71 {
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72 externalInterfacePresent = 1;
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73 global.deviceDataSendToMaster.hw_Info.extADC = 1;
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74 }
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75 global.deviceDataSendToMaster.hw_Info.checkADC = 1;
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76
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77 /* init data values */
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78 externalV33_On = 0;
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79 externalCO2Value = 0;
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80 externalCO2SignalStrength = 0;
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81 externalCO2Status = 0;
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82 }
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83
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84
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85 uint8_t externalInterface_StartConversion(uint8_t channel)
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86 {
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87 uint8_t retval = 0;
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88 uint8_t confByte = 0;
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89
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90 if(channel < MAX_ADC_CHANNEL)
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91 {
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92 confByte = ADC_START_CONVERSION | ADC_RESOLUTION_16BIT | ADC_GAIN_8;
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93 confByte |= channel << 5;
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94 retval = I2C_Master_Transmit(DEVICE_EXTERNAL_ADC, &confByte, 1);
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95 }
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96 return retval;
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97 }
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98
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99 /* Check if conversion is done and trigger measurement of next channel */
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100 uint8_t externalInterface_ReadAndSwitch()
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101 {
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102 uint8_t retval = EXTERNAL_ADC_NO_DATA;
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103
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104 if(externalInterfacePresent)
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105 {
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106 if(I2C_Master_Receive(DEVICE_EXTERNAL_ADC, recBuf, ADC_ANSWER_LENGTH) == HAL_OK)
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107 {
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108 if((recBuf[ANSWER_CONFBYTE_INDEX] & ADC_START_CONVERSION) == 0) /* !ready set => received data contains new value */
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109 {
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110 retval = activeChannel; /* return channel number providing new data */
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111 activeChannel++;
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112 if(activeChannel == MAX_ADC_CHANNEL)
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113 {
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114 activeChannel = 0;
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115 }
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116 externalInterface_StartConversion(activeChannel);
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117 timeoutCnt = 0;
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118 }
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119 else
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120 {
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121 if(timeoutCnt++ >= ADC_TIMEOUT)
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122 {
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123 externalInterface_StartConversion(activeChannel);
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124 timeoutCnt = 0;
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125 }
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126 }
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127 }
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128 else /* take also i2c bus disturb into account */
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129 {
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130 if(timeoutCnt++ >= ADC_TIMEOUT)
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131 {
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132 externalInterface_StartConversion(activeChannel);
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133 timeoutCnt = 0;
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134 }
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135 }
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136 }
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137 return retval;
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138 }
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139 float externalInterface_CalculateADCValue(uint8_t channel)
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140 {
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141 int32_t rawvalue = 0;
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142 float retValue = 0.0;
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143 if(channel < MAX_ADC_CHANNEL)
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144 {
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145
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146 rawvalue = ((recBuf[0] << 16) | (recBuf[1] << 8) | (recBuf[2]));
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147
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148 switch(recBuf[3] & 0x0C) /* confbyte => Resolution bits*/
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149 {
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150 case ADC_RESOLUTION_16BIT: rawvalue = rawvalue >> 8; /* only 2 databytes received shift out confbyte*/
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151 if(rawvalue & (0x1 << (ADC_RESOLUTION_16BIT_VALUE-1))) /* MSB set => negative number */
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152 {
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153 rawvalue |= 0xFFFF0000; /* set MSB for int32 */
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154 }
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155 else
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156 {
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157 rawvalue &= 0x0000FFFF;
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158 }
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159 externalChannel_mV[channel] = ADC_REF_VOLTAGE_MV * 2.0 / (float) pow(2,ADC_RESOLUTION_16BIT_VALUE); /* calculate bit resolution */
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160 break;
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161 case ADC_RESOLUTION_18BIT: if(rawvalue & (0x1 << (ADC_RESOLUTION_18BIT_VALUE-1))) /* MSB set => negative number */
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162 {
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163 rawvalue |= 0xFFFE0000; /* set MSB for int32 */
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164 }
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165 externalChannel_mV[channel] = ADC_REF_VOLTAGE_MV * 2.0 / (float) pow(2,ADC_RESOLUTION_18BIT_VALUE); /* calculate bit resolution */
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166 break;
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167 default: rawvalue = 0;
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168 break;
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169 }
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170 externalChannel_mV[channel] = externalChannel_mV[channel] * rawvalue / ADC_GAIN_8_VALUE;
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171 retValue = externalChannel_mV[channel];
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172 }
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173 return retValue;
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174 }
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175 float getExternalInterfaceChannel(uint8_t channel)
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176 {
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177 float retval = 0;
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178
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179 if(channel < MAX_ADC_CHANNEL)
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180 {
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181 retval = externalChannel_mV[channel];
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182 }
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183 return retval;
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184 }
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185
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186 uint8_t setExternalInterfaceChannel(uint8_t channel, float value)
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187 {
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188 uint8_t retval = 0;
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189
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190 if(channel < MAX_ADC_CHANNEL)
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191 {
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192 externalChannel_mV[channel] = value;
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193 retval = 1;
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194 }
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195 return retval;
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196 }
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197
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198 void externalInterface_InitPower33(void)
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199 {
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200 GPIO_InitTypeDef GPIO_InitStructure;
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201
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202 GPIO_InitStructure.Pin = GPIO_PIN_7;
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203 GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
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204 GPIO_InitStructure.Pull = GPIO_PULLUP;
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205 GPIO_InitStructure.Speed = GPIO_SPEED_LOW;
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206 HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
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207 HAL_GPIO_WritePin(GPIOC,GPIO_PIN_7,GPIO_PIN_SET);
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208 }
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209
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210
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211 uint8_t externalInterface_isEnabledPower33()
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212 {
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213 return externalV33_On;
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214 }
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215
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216 uint8_t externalInterface_isEnabledADC()
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217 {
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218 return externalADC_On;
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219 }
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220
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221 void externalInterface_SwitchPower33(uint8_t state)
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222 {
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223 if(state != externalV33_On)
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224 {
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225 if(state)
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226 {
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227 HAL_GPIO_WritePin(GPIOC,GPIO_PIN_7,GPIO_PIN_RESET);
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228 externalV33_On = 1;
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229 MX_USART1_UART_Init();
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230 }
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231 else
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232 {
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233 HAL_GPIO_WritePin(GPIOC,GPIO_PIN_7,GPIO_PIN_SET);
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234 externalV33_On = 0;
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235 externalInterface_SetCO2Value(0);
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236 externalInterface_SetCO2SignalStrength(0);
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237 MX_USART1_UART_DeInit();
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238 }
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239 }
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240 }
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241 void externalInterface_SwitchADC(uint8_t state)
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242 {
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243 if((state) && (externalInterfacePresent))
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244 {
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245 externalInterface_StartConversion(activeChannel);
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246 externalADC_On = 1;
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247 }
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248 else
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249 {
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250 externalADC_On = 0;
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251 }
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252 }
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253
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254 void externalInterface_SetCO2Value(uint16_t CO2_ppm)
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255 {
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256 externalCO2Value = CO2_ppm;
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257 }
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258
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259 void externalInterface_SetCO2SignalStrength(uint16_t LED_qa)
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260 {
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261 externalCO2SignalStrength = LED_qa;
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262 }
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263
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264 uint16_t externalInterface_GetCO2Value(void)
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265 {
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266 return externalCO2Value;
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267 }
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268
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269 uint16_t externalInterface_GetCO2SignalStrength(void)
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270 {
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271 return externalCO2SignalStrength;
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272 }
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273
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274
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275 void externalInterface_SetCO2State(uint16_t state)
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276 {
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277 externalCO2Status = state;
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278 }
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279
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280 uint16_t externalInterface_GetCO2State(void)
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281 {
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282 return externalCO2Status;
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283 }
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284
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285 void externalInterface_ExecuteCmd(uint16_t Cmd)
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286 {
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287 char cmdString[10];
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288 uint8_t cmdLength = 0;
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289
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290 switch(Cmd & 0x00FF) /* lower byte is reserved for commands */
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291 {
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292 case EXT_INTERFACE_CO2_CALIB: cmdLength = snprintf(cmdString, 10, "G\r\n");
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293 break;
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294 default:
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295 break;
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296 }
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297 if(cmdLength != 0)
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298 {
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299 HAL_UART_Transmit(&huart1,(uint8_t*)cmdString,cmdLength,10);
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300 }
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301 return;
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302 }
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303