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annotate Small_CPU/Src/externalInterface.c @ 664:667093daa937 Betatest

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Stability improvment bluetooth startup: The previous implementation expected a default setup of the Bluetooth module. Deviations from the default expectation caused the init function to stop. The new implementation is able to fix wrong baud rate setting (reset baudrate to default 115200). In addition the function evaluating the answers of the module is not able to derive the status out of a data stream.
author Ideenmodellierer
date Tue, 21 Dec 2021 19:36:41 +0100
parents 1b995079c045
children 52d68cf9994c
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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 uint16_t externalCO2Value;
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60 static uint16_t externalCO2SignalStrength;
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61 static uint16_t externalCO2Status = 0;
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62
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63
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64 void externalInterface_Init(void)
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65 {
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66 activeChannel = 0;
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67 timeoutCnt = 0;
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68 externalInterfacePresent = 0;
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69 if(externalInterface_StartConversion(activeChannel) == HAL_OK)
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70 {
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71 externalInterfacePresent = 1;
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72 global.deviceDataSendToMaster.hw_Info.extADC = 1;
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73 }
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74 global.deviceDataSendToMaster.hw_Info.checkADC = 1;
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75
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76 /* init data values */
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77 externalV33_On = 0;
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78 externalCO2Value = 0;
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79 externalCO2SignalStrength = 0;
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80 externalCO2Status = 0;
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81 }
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82
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83
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84 uint8_t externalInterface_StartConversion(uint8_t channel)
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85 {
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86 uint8_t retval = 0;
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87 uint8_t confByte = 0;
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88
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89 if(channel < MAX_ADC_CHANNEL)
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90 {
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91 confByte = ADC_START_CONVERSION | ADC_RESOLUTION_16BIT | ADC_GAIN_8;
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92 confByte |= channel << 5;
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93 retval = I2C_Master_Transmit(DEVICE_EXTERNAL_ADC, &confByte, 1);
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94 }
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95 return retval;
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96 }
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97
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98 /* Check if conversion is done and trigger measurement of next channel */
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99 uint8_t externalInterface_ReadAndSwitch()
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100 {
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101 uint8_t retval = EXTERNAL_ADC_NO_DATA;
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102
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103 if(externalInterfacePresent)
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104 {
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105 if(I2C_Master_Receive(DEVICE_EXTERNAL_ADC, recBuf, ADC_ANSWER_LENGTH) == HAL_OK)
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106 {
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107 if((recBuf[ANSWER_CONFBYTE_INDEX] & ADC_START_CONVERSION) == 0) /* !ready set => received data contains new value */
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108 {
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109 retval = activeChannel; /* return channel number providing new data */
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110 activeChannel++;
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111 if(activeChannel == MAX_ADC_CHANNEL)
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112 {
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113 activeChannel = 0;
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114 }
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115 externalInterface_StartConversion(activeChannel);
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116 timeoutCnt = 0;
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117 }
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118 else
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119 {
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120 if(timeoutCnt++ >= ADC_TIMEOUT)
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121 {
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122 externalInterface_StartConversion(activeChannel);
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123 timeoutCnt = 0;
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124 }
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125 }
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126 }
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127 else /* take also i2c bus disturb into account */
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128 {
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129 if(timeoutCnt++ >= ADC_TIMEOUT)
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130 {
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131 externalInterface_StartConversion(activeChannel);
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132 timeoutCnt = 0;
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133 }
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134 }
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135 }
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136 return retval;
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137 }
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138 float externalInterface_CalculateADCValue(uint8_t channel)
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139 {
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140 int32_t rawvalue = 0;
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141 float retValue = 0.0;
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142 if(channel < MAX_ADC_CHANNEL)
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143 {
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144
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145 rawvalue = ((recBuf[0] << 16) | (recBuf[1] << 8) | (recBuf[2]));
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146
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147 switch(recBuf[3] & 0x0C) /* confbyte => Resolution bits*/
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148 {
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149 case ADC_RESOLUTION_16BIT: rawvalue = rawvalue >> 8; /* only 2 databytes received shift out confbyte*/
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150 if(rawvalue & (0x1 << (ADC_RESOLUTION_16BIT_VALUE-1))) /* MSB set => negative number */
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151 {
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152 rawvalue |= 0xFFFF0000; /* set MSB for int32 */
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153 }
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154 else
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155 {
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156 rawvalue &= 0x0000FFFF;
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157 }
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158 externalChannel_mV[channel] = ADC_REF_VOLTAGE_MV * 2.0 / (float) pow(2,ADC_RESOLUTION_16BIT_VALUE); /* calculate bit resolution */
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159 break;
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160 case ADC_RESOLUTION_18BIT: if(rawvalue & (0x1 << (ADC_RESOLUTION_18BIT_VALUE-1))) /* MSB set => negative number */
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161 {
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162 rawvalue |= 0xFFFE0000; /* set MSB for int32 */
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163 }
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164 externalChannel_mV[channel] = ADC_REF_VOLTAGE_MV * 2.0 / (float) pow(2,ADC_RESOLUTION_18BIT_VALUE); /* calculate bit resolution */
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165 break;
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166 default: rawvalue = 0;
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167 break;
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168 }
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169 externalChannel_mV[channel] = externalChannel_mV[channel] * rawvalue / ADC_GAIN_8_VALUE;
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170 retValue = externalChannel_mV[channel];
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171 }
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172 return retValue;
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173 }
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174 float getExternalInterfaceChannel(uint8_t channel)
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175 {
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176 float retval = 0;
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177
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178 if(channel < MAX_ADC_CHANNEL)
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179 {
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180 retval = externalChannel_mV[channel];
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181 }
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182 return retval;
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183 }
662
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184
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185 void externalInterface_InitPower33(void)
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186 {
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187 GPIO_InitTypeDef GPIO_InitStructure;
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188
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189 GPIO_InitStructure.Pin = GPIO_PIN_7;
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190 GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
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191 GPIO_InitStructure.Pull = GPIO_PULLUP;
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192 GPIO_InitStructure.Speed = GPIO_SPEED_LOW;
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193 HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
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194 HAL_GPIO_WritePin(GPIOC,GPIO_PIN_7,GPIO_PIN_SET);
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195 }
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196
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197
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198 uint8_t externalInterface_isEnabledPower33()
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199 {
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200 return externalV33_On;
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201 }
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202 void externalInterface_SwitchPower33(uint8_t state)
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203 {
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204 if(state != externalV33_On)
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205 {
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206 if(state)
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207 {
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208 HAL_GPIO_WritePin(GPIOC,GPIO_PIN_7,GPIO_PIN_RESET);
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209 externalV33_On = 1;
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210 MX_USART1_UART_Init();
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211 }
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212 else
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213 {
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214 HAL_GPIO_WritePin(GPIOC,GPIO_PIN_7,GPIO_PIN_SET);
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215 externalV33_On = 0;
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216 externalInterface_SetCO2Value(0);
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217 externalInterface_SetCO2SignalStrength(0);
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218 MX_USART1_UART_DeInit();
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219 }
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220 }
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221 }
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222
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223 void externalInterface_SetCO2Value(uint16_t CO2_ppm)
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224 {
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225 externalCO2Value = CO2_ppm;
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226 }
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227
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228 void externalInterface_SetCO2SignalStrength(uint16_t LED_qa)
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229 {
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230 externalCO2SignalStrength = LED_qa;
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231 }
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232
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233 uint16_t externalInterface_GetCO2Value(void)
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234 {
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235 return externalCO2Value;
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236 }
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237
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238 uint16_t externalInterface_GetCO2SignalStrength(void)
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239 {
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240 return externalCO2SignalStrength;
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241 }
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242
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243
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244 void externalInterface_SetCO2State(uint16_t state)
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245 {
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246 externalCO2Status = state;
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247 }
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248
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249 uint16_t externalInterface_GetCO2State(void)
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250 {
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251 return externalCO2Status;
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252 }
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253
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254 void externalInterface_ExecuteCmd(uint16_t Cmd)
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255 {
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256 char cmdString[10];
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257 uint8_t cmdLength = 0;
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258
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259 switch(Cmd & 0x00FF) /* lower byte is reserved for commands */
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260 {
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261 case EXT_INTERFACE_CO2_CALIB: cmdLength = snprintf(cmdString, 10, "G\r\n");
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262 break;
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263 default:
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264 break;
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265 }
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266 if(cmdLength != 0)
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267 {
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268 HAL_UART_Transmit(&huart1,(uint8_t*)cmdString,cmdLength,10);
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269 }
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270 return;
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271 }
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272