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38
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1 /**
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2 ******************************************************************************
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3 * @file uart.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 27-March-2014
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7 * @brief button control
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8 *
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9 @verbatim
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10 ==============================================================================
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11 ##### How to use #####
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12 ==============================================================================
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13 @endverbatim
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14 ******************************************************************************
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15 * @attention
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16 *
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17 * <h2><center>© COPYRIGHT(c) 2015 heinrichs weikamp</center></h2>
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18 *
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19 ******************************************************************************
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20 */
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21 /* Includes ------------------------------------------------------------------*/
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22 #include "uart.h"
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662
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23 #include "externalInterface.h"
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24 #include "data_exchange.h"
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38
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25
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26 /* Private variables ---------------------------------------------------------*/
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27
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662
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28 #define CHUNK_SIZE (20u) /* the DMA will handle chunk size transfers */
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29 #define CHUNKS_PER_BUFFER (3u)
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30 UART_HandleTypeDef huart1;
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31
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32 DMA_HandleTypeDef hdma_usart1_rx;
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38
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33
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662
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34 uint8_t rxBuffer[CHUNK_SIZE * CHUNKS_PER_BUFFER]; /* The complete buffer has a X * chunk size to allow fariations in buffer read time */
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35 static uint8_t rxWriteIndex; /* Index of the data item which is analysed */
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36 static uint8_t rxReadIndex; /* Index at which new data is stared */
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37 static uint8_t lastCmdIndex; /* Index of last command which has not been completly received */
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38 static uint8_t dmaActive; /* Indicator if DMA receiption needs to be started */
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38
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39
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662
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40 float LED_Level = 0.0; /* Normalized LED value which may be used as indication for the health status of the sensor */
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41 float LED_ZeroOffset = 0.0;
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42 float pCO2 = 0.0;
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38
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43 /* Exported functions --------------------------------------------------------*/
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44
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662
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45 void MX_USART1_UART_Init(void)
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38
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46 {
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662
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47 /* regular init */
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48
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49 huart1.Instance = USART1;
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50 huart1.Init.BaudRate = 9600;
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51 huart1.Init.WordLength = UART_WORDLENGTH_8B;
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52 huart1.Init.StopBits = UART_STOPBITS_1;
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53 huart1.Init.Parity = UART_PARITY_NONE;
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54 huart1.Init.Mode = UART_MODE_TX_RX;
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55 huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
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56 huart1.Init.OverSampling = UART_OVERSAMPLING_16;
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57
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58 HAL_UART_Init(&huart1);
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59
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60 rxReadIndex = 0;
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61 lastCmdIndex = 0;
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62 rxWriteIndex = 0;
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63 dmaActive = 0;
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64 }
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38
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65
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662
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66 void MX_USART1_UART_DeInit(void)
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67 {
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68 HAL_DMA_DeInit(&hdma_usart1_rx);
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69 HAL_UART_DeInit(&huart1);
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70 }
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71
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72 void MX_USART1_DMA_Init()
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73 {
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74 /* DMA controller clock enable */
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75 __DMA2_CLK_ENABLE();
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76
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77 /* Peripheral DMA init*/
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78 hdma_usart1_rx.Instance = DMA2_Stream5;
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79 hdma_usart1_rx.Init.Channel = DMA_CHANNEL_4;
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80 hdma_usart1_rx.Init.Direction = DMA_PERIPH_TO_MEMORY; //DMA_MEMORY_TO_PERIPH;
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81 hdma_usart1_rx.Init.PeriphInc = DMA_PINC_DISABLE;
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82 hdma_usart1_rx.Init.MemInc = DMA_MINC_ENABLE;
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83 hdma_usart1_rx.Init.PeriphDataAlignment = DMA_MDATAALIGN_BYTE;
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84 hdma_usart1_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
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85 hdma_usart1_rx.Init.Mode = DMA_NORMAL;
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86 hdma_usart1_rx.Init.Priority = DMA_PRIORITY_LOW;
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87 hdma_usart1_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
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88 HAL_DMA_Init(&hdma_usart1_rx);
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89
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90 __HAL_LINKDMA(&huart1,hdmarx,hdma_usart1_rx);
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91
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92 /* DMA interrupt init */
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93 HAL_NVIC_SetPriority(DMA2_Stream5_IRQn, 0, 0);
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94 HAL_NVIC_EnableIRQ(DMA2_Stream5_IRQn);
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38
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95 }
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96
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690
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97 void ConvertByteToHexString(uint8_t byte, char* str)
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98 {
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99 uint8_t worker = 0;
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100 uint8_t digit = 0;
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101 uint8_t digitCnt = 1;
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38
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102
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690
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103 worker = byte;
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104 while((worker!=0) && (digitCnt != 255))
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105 {
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106 digit = worker % 16;
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107 if( digit < 10)
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108 {
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109 digit += '0';
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110 }
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111 else
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112 {
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113 digit += 'A' - 10;
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114 }
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115 str[digitCnt--]= digit;
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116 worker = worker / 16;
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117 }
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118 }
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662
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119
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690
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120
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121 #ifdef ENABLE_CO2_SUPPORT
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122 void HandleUARTCO2Data(void)
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38
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123 {
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662
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124 uint8_t localRX = rxReadIndex;
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125 uint8_t dataType = 0;
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690
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126 uint32_t dataValue = 0;
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662
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127 static receiveState_t rxState = RX_Ready;
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128 static uint32_t lastReceiveTick = 0;
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129
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130 while(localRX != rxWriteIndex)
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131 {
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132 lastReceiveTick = HAL_GetTick();
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133 if(rxState == RX_Ready) /* identify data content */
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134 {
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135 switch(rxBuffer[localRX])
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136 {
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137 case 'l':
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138 case 'D':
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139 case 'Z':
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140 dataType = rxBuffer[localRX];
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141 rxState = RX_Data0;
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142 dataValue = 0;
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143 break;
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144
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145 default: /* unknown or corrupted => ignore */
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146 break;
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147 }
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148 }
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149 else if((rxState >= RX_Data0) && (rxState <= RX_Data4))
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150 {
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151 if((rxBuffer[localRX] >= '0') && (rxBuffer[localRX] <= '9'))
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152 {
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153 dataValue = dataValue * 10 + (rxBuffer[localRX] - '0');
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154 rxState++;
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155 }
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156 }
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157 if((rxBuffer[localRX] == ' ') || (rxBuffer[localRX] == '\n')) /* Abort data detection */
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158 {
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159 if(rxState == RX_DataComplete)
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160 {
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161 if(externalInterface_GetCO2State() == 0)
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162 {
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163 externalInterface_SetCO2State(EXT_INTERFACE_33V_ON);
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164 }
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165 switch(dataType)
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166 {
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167 case 'D': externalInterface_SetCO2SignalStrength(dataValue);
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168 break;
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169 case 'l': LED_ZeroOffset = dataValue;
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170 break;
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171 case 'Z': externalInterface_SetCO2Value(dataValue);
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172 break;
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173 default: break;
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174 }
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175 }
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176 if(rxState != RX_Data0) /* reset state machine because message in wrong format */
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177 {
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178 rxState = RX_Ready;
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179 }
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180 }
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181
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182 localRX++;
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183 rxReadIndex++;
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184 if(rxReadIndex >= CHUNK_SIZE * CHUNKS_PER_BUFFER)
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185 {
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186 localRX = 0;
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187 rxReadIndex = 0;
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188 }
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189 }
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190
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191 if(time_elapsed_ms(lastReceiveTick,HAL_GetTick()) > 2000) /* check for communication timeout */
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192 {
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193 externalInterface_SetCO2State(0);
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194 }
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195
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196 if((dmaActive == 0) && (externalInterface_isEnabledPower33())) /* Should never happen in normal operation => restart in case of communication error */
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197 {
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198 if(HAL_OK == HAL_UART_Receive_DMA (&huart1, &rxBuffer[rxWriteIndex], CHUNK_SIZE))
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199 {
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200 dmaActive = 1;
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201 }
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202 }
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38
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203 }
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690
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204 #endif
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205
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206 #ifdef ENABLE_SENTINEL_MODE
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207 void HandleUARTSentinelData(void)
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208 {
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209 uint8_t localRX = rxReadIndex;
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210 static uint8_t dataType = 0;
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211 static uint32_t dataValue[3];
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212 static uint8_t dataValueIdx = 0;
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213 static receiveState_t rxState = RX_Ready;
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214 static uint32_t lastReceiveTick = 0;
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215 static uint8_t lastAlive = 0;
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216 static uint8_t curAlive = 0;
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217 static uint8_t checksum = 0;
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218 char checksum_str[]="00";
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219
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220 while(localRX != rxWriteIndex)
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221 {
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222 lastReceiveTick = HAL_GetTick();
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223
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224 switch(rxState)
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225 {
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226 case RX_Ready: if((rxBuffer[localRX] >= 'a') && (rxBuffer[localRX] <= 'z'))
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227 {
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228 rxState = RX_DetectStart;
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229 curAlive = rxBuffer[localRX];
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230 checksum = 0;
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231 }
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232 break;
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233
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234 case RX_DetectStart: checksum += rxBuffer[localRX];
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235 if(rxBuffer[localRX] == '1')
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236 {
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237 rxState = RX_SelectData;
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238 dataType = 0xFF;
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239
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240 }
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241 else
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242 {
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243 rxState = RX_Ready;
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244 }
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245 break;
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246
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247 case RX_SelectData: checksum += rxBuffer[localRX];
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248 switch(rxBuffer[localRX])
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249 {
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250 case 'T': dataType = rxBuffer[localRX];
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251 break;
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252 case '0': if(dataType != 0xff)
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253 {
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254 rxState = RX_Data0;
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255 dataValueIdx = 0;
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256 dataValue[0] = 0;
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257
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258 }
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259 else
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260 {
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261 rxState = RX_Ready;
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262 }
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263 break;
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264 default: rxState = RX_Ready;
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265 }
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266 break;
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267
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268 case RX_Data0:
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269 case RX_Data1:
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270 case RX_Data2:
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271 case RX_Data4:
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272 case RX_Data5:
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273 case RX_Data6:
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274 case RX_Data8:
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275 case RX_Data9:
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276 case RX_Data10: checksum += rxBuffer[localRX];
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277 if((rxBuffer[localRX] >= '0') && (rxBuffer[localRX] <= '9'))
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278 {
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279 dataValue[dataValueIdx] = dataValue[dataValueIdx] * 10 + (rxBuffer[localRX] - '0');
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280 rxState++;
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281 }
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282 else
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283 {
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284 rxState = RX_Ready;
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285 }
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286 break;
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287
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288 case RX_Data3:
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289 case RX_Data7: checksum += rxBuffer[localRX];
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290 if(rxBuffer[localRX] == '0')
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291 {
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292 rxState++;
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293 dataValueIdx++;
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294 dataValue[dataValueIdx] = 0;
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295 }
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296 else
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297 {
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298 rxState = RX_Ready;
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299 }
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300 break;
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301 case RX_Data11: rxState = RX_DataComplete;
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302 ConvertByteToHexString(checksum,checksum_str);
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303 if(rxBuffer[localRX] == checksum_str[0])
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304 {
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305 rxState = RX_DataComplete;
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306 }
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307 else
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308 {
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309 rxState = RX_Ready;
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310 }
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311
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312 break;
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313
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314 case RX_DataComplete: if(rxBuffer[localRX] == checksum_str[1])
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315 {
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316 setExternalInterfaceChannel(0,(float)(dataValue[0] / 10.0));
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317 setExternalInterfaceChannel(1,(float)(dataValue[1] / 10.0));
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318 setExternalInterfaceChannel(2,(float)(dataValue[2] / 10.0));
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319 }
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320 rxState = RX_Ready;
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321 break;
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322
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323
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324 default: rxState = RX_Ready;
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325 break;
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326
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327 }
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328
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329 localRX++;
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330 rxReadIndex++;
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331 if(rxReadIndex >= CHUNK_SIZE * CHUNKS_PER_BUFFER)
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332 {
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333 localRX = 0;
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334 rxReadIndex = 0;
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335 }
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336 }
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337
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338 if(time_elapsed_ms(lastReceiveTick,HAL_GetTick()) > 4000) /* check for communication timeout */
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339 {
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340 if(curAlive == lastAlive)
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341 {
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342 setExternalInterfaceChannel(0,0.0);
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343 setExternalInterfaceChannel(1,0.0);
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344 setExternalInterfaceChannel(2,0.0);
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345 }
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346 lastAlive = curAlive;
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347 }
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348
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349 if((dmaActive == 0) && (externalInterface_isEnabledPower33())) /* Should never happen in normal operation => restart in case of communication error */
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350 {
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351 if(HAL_OK == HAL_UART_Receive_DMA (&huart1, &rxBuffer[rxWriteIndex], CHUNK_SIZE))
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352 {
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353 dmaActive = 1;
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354 }
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355 }
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356 }
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357 #endif
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38
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358
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662
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359 void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
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38
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360 {
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662
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361 if(huart == &huart1)
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362 {
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363 dmaActive = 0;
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364 rxWriteIndex+=CHUNK_SIZE;
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365 if(rxWriteIndex >= CHUNK_SIZE * CHUNKS_PER_BUFFER)
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366 {
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367 rxWriteIndex = 0;
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368 }
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369 if((rxWriteIndex / CHUNK_SIZE) != (rxReadIndex / CHUNK_SIZE)) /* start next transfer if we did not catch up with read index */
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370 {
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371 if(externalInterface_isEnabledPower33())
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372 {
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373 if(HAL_OK == HAL_UART_Receive_DMA (&huart1, &rxBuffer[rxWriteIndex], CHUNK_SIZE))
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374 {
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375 dmaActive = 1;
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376 }
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377 }
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378 }
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379 }
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38
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380 }
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381
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382
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662
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383
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384
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385
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386
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387
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388
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38
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389 /************************ (C) COPYRIGHT heinrichs weikamp *****END OF FILE****/
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