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annotate Small_CPU/Src/uartProtocol_Co2.c @ 1063:a3f42192da0f Icon_Integration

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Always use polling mode for CO2 operation: In the previous version the CO2 sensor was operated in streaming mode (2 measurements a second) in case it was used stand alone (without multiplexer). This added some complexity to the implementation (setup, error handling etc). To reduce this the sensor will now always be operated in polling mode like it is done for multiplexer operation. To make sure that the correct mode is set a command has been added to the configuration steps.
author Ideenmodellierer
date Wed, 11 Feb 2026 18:35:44 +0100
parents 0b81ac558e89
children 1f2067cad41b
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1 /**
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2 ******************************************************************************
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3 * @file uartProtocol_Co2.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 31-Jul-2023
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7 * @brief Interface functionality to external, UART based CO2 sensors
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8 *
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9 @verbatim
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10
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11
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12 @endverbatim
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13 ******************************************************************************
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14 * @attention
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15 *
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16 * <h2><center>&copy; COPYRIGHT(c) 2023 heinrichs weikamp</center></h2>
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17 *
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18 ******************************************************************************
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19 */
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20 /* Includes ------------------------------------------------------------------*/
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21
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22 #include <string.h>
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23 #include <uartProtocol_Co2.h>
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24 #include "uart.h"
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25 #include "externalInterface.h"
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26
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27 #ifdef ENABLE_CO2_SUPPORT
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28 static uint8_t CO2Connected = 0; /* Binary indicator if a sensor is connected or not */
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29 static receiveStateCO2_t rxState = CO2RX_Ready;
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30
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31
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32
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33 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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34 float LED_ZeroOffset = 0.0;
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35 float pCO2 = 0.0;
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36
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37
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38
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39 void uartCo2_SendCmd(uint8_t CO2Cmd, uint8_t *cmdString, uint8_t *cmdLength)
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40 {
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41 *cmdLength = 0;
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42
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43 switch (CO2Cmd)
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44 {
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45 case CO2CMD_MODE_POLL: *cmdLength = snprintf((char*)cmdString, 10, "K 2\r\n");
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46 break;
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47 case CO2CMD_MODE_STREAM: *cmdLength = snprintf((char*)cmdString, 10, "K 1\r\n");
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48 break;
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49 case CO2CMD_CALIBRATE: *cmdLength = snprintf((char*)cmdString, 10, "G\r\n");
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50 break;
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51 case CO2CMD_GETDATA: *cmdLength = snprintf((char*)cmdString, 10, "Q\r\n");
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52 break;
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53 case CO2CMD_GETSCALE: *cmdLength = snprintf((char*)cmdString, 10, ".\r\n");
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54 break;
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55 default: *cmdLength = 0;
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56 break;
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57 }
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58 if(cmdLength != 0)
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59 {
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60 UART_SendCmdString(cmdString);
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61 }
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62 }
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63
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64
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65 void uartCo2_Control(void)
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66 {
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67 static uint8_t cmdString[10];
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68 static uint8_t cmdLength = 0;
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69 static uint8_t lastComState = 0;
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70
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71 uint8_t activeSensor = externalInterface_GetActiveUartSensor();
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72 uartCO2Status_t localComState = externalInterface_GetSensorState(activeSensor + EXT_INTERFACE_MUX_OFFSET);
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73
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74 if(localComState == UART_CO2_ERROR)
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75 {
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76 localComState = lastComState;
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77 }
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78
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79 if(localComState == UART_CO2_INIT)
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80 {
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81 CO2Connected = 0;
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82 externalInterface_SetCO2Scale(0.0);
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83 UART_ReadData(SENSOR_CO2, 1); /* flush buffer */
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84 UART_StartDMA_Receiption(&Uart1Ctrl);
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85 localComState = UART_CO2_SETUP;
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86 }
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87 if(localComState == UART_CO2_SETUP)
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88 {
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89 if(externalInterface_GetCO2Scale() == 0.0)
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90 {
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91 uartCo2_SendCmd(CO2CMD_GETSCALE, cmdString, &cmdLength);
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92 }
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93 else
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94 {
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95 localComState = UART_CO2_MODE;
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96 }
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97 }
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98 else if(localComState == UART_CO2_MODE)
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99 {
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100 uartCo2_SendCmd(CO2CMD_MODE_POLL, cmdString, &cmdLength);
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101 }
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102 else
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103 {
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104 if(localComState == UART_CO2_CALIBRATE)
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105 {
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106 uartCo2_SendCmd(CO2CMD_CALIBRATE, cmdString, &cmdLength);
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107 localComState = UART_CO2_IDLE;
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108 }
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109 else
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110 {
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111 if(localComState == UART_CO2_IDLE)
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112 {
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113 if(externalInterface_GetCO2Scale() == 0.0)
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114 {
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115 uartCo2_SendCmd(CO2CMD_GETSCALE, cmdString, &cmdLength);
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116 localComState = UART_CO2_SETUP;
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117 }
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118 else
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119 {
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120 uartCo2_SendCmd(CO2CMD_GETDATA, cmdString, &cmdLength);
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121 localComState = UART_CO2_OPERATING;
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122 }
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123 }
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124 else /* resend last command */
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125 {
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126 UART_SendCmdString(cmdString);
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127 cmdLength = 0;
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128 }
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129 }
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130 }
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131 lastComState = localComState;
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132 externalInterface_SetSensorState(activeSensor + EXT_INTERFACE_MUX_OFFSET,localComState);
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133 }
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134
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135
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136 void uartCo2_ProcessData(uint8_t data)
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137 {
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138 static uint8_t dataType = 0;
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139 static uint32_t dataValue = 0;
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140 uint8_t activeSensor = externalInterface_GetActiveUartSensor();
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141 uartCO2Status_t localComState = externalInterface_GetSensorState(activeSensor + EXT_INTERFACE_MUX_OFFSET);
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142
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143 if(rxState == CO2RX_Ready) /* identify data content */
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144 {
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145 switch(data)
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146 {
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147 case 'G':
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148 case 'K':
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149 case 'l':
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150 case 'D':
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151 case 'Z':
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152 case '.': dataType = data;
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153 rxState = CO2RX_Data0;
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154 dataValue = 0;
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155 break;
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156 case '?': localComState = UART_CO2_ERROR;
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157 break;
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158 default: /* unknown or corrupted => ignore */
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159 break;
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160 }
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161 }
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162 else if((data >= '0') && (data <= '9'))
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163 {
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164 if((rxState >= CO2RX_Data0) && (rxState <= CO2RX_Data4))
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165 {
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166 dataValue = dataValue * 10 + (data - '0');
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167 rxState++;
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168 if(rxState == CO2RX_Data5)
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169 {
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170 rxState = CO2RX_DataComplete;
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171 }
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172 }
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173 else /* protocol error data has max 5 digits */
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174 {
842
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175 if(rxState != CO2RX_DataComplete) /* commands will not answer with number values */
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9602a7338f28 DevBugfix CO2 sensor in streaming mode:
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176 {
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177 rxState = CO2RX_Ready;
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178 }
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179 }
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180 }
916
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181 else if((data == ' ') || (data == '\n')) /* Abort data detection */
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182 {
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183 if(rxState == CO2RX_DataComplete)
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184 {
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185 CO2Connected = 1;
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186 switch(localComState)
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187 {
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188 case UART_CO2_SETUP: if(dataType == '.')
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189 {
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190 localComState = UART_CO2_IDLE;
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191 }
a3f42192da0f Always use polling mode for CO2 operation:
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192 break;
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193 case UART_CO2_MODE: if((dataType == 'K') && (dataValue == 2))
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194 {
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195 localComState = UART_CO2_IDLE;
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196 }
a3f42192da0f Always use polling mode for CO2 operation:
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197 break;
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198 default: localComState = UART_CO2_IDLE;
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199 break;
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200 }
1063
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201
798
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202 if(externalInterface_GetCO2State() == 0)
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203 {
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204 externalInterface_SetCO2State(EXT_INTERFACE_33V_ON);
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205 }
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206 switch(dataType)
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207 {
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208 case 'D': externalInterface_SetCO2SignalStrength(dataValue);
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209 break;
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210 case 'l': LED_ZeroOffset = dataValue;
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211 break;
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212 case 'Z': externalInterface_SetCO2Value(dataValue);
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213 break;
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214 case '.': externalInterface_SetCO2Scale(dataValue);
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215 break;
842
c3dd461ca3f9 Migrated Sentinel protocol to new UART structure:
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216 default: rxState = CO2RX_Ready;
798
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217 break;
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218 }
976
0b81ac558e89 Devbugfix UART buffer cleaning:
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diff changeset
219 rxState = CO2RX_Ready;
798
e9eba334b942 Migrated CO2 protocol implementation to new format:
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220 }
842
c3dd461ca3f9 Migrated Sentinel protocol to new UART structure:
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diff changeset
221 if(rxState != CO2RX_Data0) /* reset state machine because message in wrong format */
798
e9eba334b942 Migrated CO2 protocol implementation to new format:
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222 {
842
c3dd461ca3f9 Migrated Sentinel protocol to new UART structure:
Ideenmodellierer
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diff changeset
223 rxState = CO2RX_Ready;
798
e9eba334b942 Migrated CO2 protocol implementation to new format:
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224 }
e9eba334b942 Migrated CO2 protocol implementation to new format:
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225 }
916
4832981f9af8 External sensor UART: Switch to DMA TX transfers:
Ideenmodellierer
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diff changeset
226 else
4832981f9af8 External sensor UART: Switch to DMA TX transfers:
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diff changeset
227 {
4832981f9af8 External sensor UART: Switch to DMA TX transfers:
Ideenmodellierer
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diff changeset
228 if((rxState >= CO2RX_Data0) && (rxState <= CO2RX_Data4))
4832981f9af8 External sensor UART: Switch to DMA TX transfers:
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diff changeset
229 {
4832981f9af8 External sensor UART: Switch to DMA TX transfers:
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diff changeset
230 rxState = CO2RX_Ready; /* numerical data expected => abort */
4832981f9af8 External sensor UART: Switch to DMA TX transfers:
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parents: 842
diff changeset
231 }
4832981f9af8 External sensor UART: Switch to DMA TX transfers:
Ideenmodellierer
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diff changeset
232 }
798
e9eba334b942 Migrated CO2 protocol implementation to new format:
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233 externalInterface_SetSensorState(activeSensor + EXT_INTERFACE_MUX_OFFSET,localComState);
e9eba334b942 Migrated CO2 protocol implementation to new format:
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234 }
e9eba334b942 Migrated CO2 protocol implementation to new format:
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235
e9eba334b942 Migrated CO2 protocol implementation to new format:
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236 uint8_t uartCo2_isSensorConnected()
e9eba334b942 Migrated CO2 protocol implementation to new format:
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237 {
e9eba334b942 Migrated CO2 protocol implementation to new format:
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238 return CO2Connected;
e9eba334b942 Migrated CO2 protocol implementation to new format:
Ideenmodellierer
parents:
diff changeset
239 }
e9eba334b942 Migrated CO2 protocol implementation to new format:
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240
e9eba334b942 Migrated CO2 protocol implementation to new format:
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241 #endif
e9eba334b942 Migrated CO2 protocol implementation to new format:
Ideenmodellierer
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242