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annotate Small_CPU/Src/externalInterface.c @ 697:d55817a11f4c

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Improvment key event detection: In previous version the evaluation of a button event was called in the 100ms callback. Assuming an event is signaled at the in line for 100ms there is a potential risk to loose a button event. To avoid this scenarion the evaluation function was moved into the extint callback (called ~50+xms) and the line readback tim was reduced to 40ms. Reminder: This function is not called in the main loop because the main loop is not executed in UART mode => movement would cause key events to not beeing detected
author Ideenmodellierer
date Sun, 25 Sep 2022 21:09:18 +0200
parents 52d68cf9994c
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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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