1 |
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2 | // Includes
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3 | #include "stm32f10x.h"
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4 | #include "STM32vldiscovery.h"
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5 | #include "stdio.h"
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6 | #include "stdlib.h"
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7 | #include "string.h"
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8 | #include "stm32f10x_i2c.h"
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9 |
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10 |
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11 | // Private define
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12 | //I2C
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13 | #define I2C1_SLAVE_ADDRESS7 0x38 // I2C Adresse Sensor
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14 | #define I2C1_Own_ADDRESS7 0x30 // I2C Adresse µC
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15 | #define ClockSpeed 200000 // 200 KHz
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16 |
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17 | // Private variables
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18 | I2C_InitTypeDef I2C_InitStructure;
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19 | GPIO_InitTypeDef GPIO_InitStructure;
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20 |
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21 | // Private function prototypes
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22 | //I2C Protokoll
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23 | void I2C_Initialisieren(void);
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24 | void I2C_Write(uint8_t Register_Adress, uint8_t Data);
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25 | uint8_t I2C_Read(uint8_t Register_Adress);
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26 | void I2C_Demo(void);
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27 |
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28 | /* Hauptprogramm -------------------------------------------------------------*/
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29 |
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30 | int main(void) //S.936
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31 |
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32 | {
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33 | // uint8_t i=0; //Zählvariable for Schleife
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34 |
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35 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
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36 | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD |
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37 | RCC_APB2Periph_GPIOE | RCC_APB2Periph_USART1|
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38 | RCC_APB2Periph_AFIO | RCC_APB2ENR_AFIOEN ,
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39 | ENABLE)
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40 |
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41 |
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42 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
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43 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
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44 | GPIO_Init(GPIOA, &GPIO_InitStructure);
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45 | GPIO_Init(GPIOB, &GPIO_InitStructure);
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46 | GPIO_Init(GPIOC, &GPIO_InitStructure);
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47 | GPIO_Init(GPIOD, &GPIO_InitStructure);
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48 | GPIO_Init(GPIOE, &GPIO_InitStructure);
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49 |
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50 | I2C_Initialisieren();
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51 | I2C_Demo();
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52 |
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53 | while(1){ }
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54 | }
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55 |
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56 |
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57 |
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58 |
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59 | //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%____I2C Bus_____%%%%%%%%%%%%%%%%%%%
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60 | void I2C_Initialisieren(void){
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61 |
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62 | //Pins konfigurieren
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63 | GPIO_InitStructure.GPIO_Pin = (GPIO_Pin_6) | (GPIO_Pin_7);
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64 | //SCL (PB6),SDA (PB7): Alternate Function, Open Drain
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65 | GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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66 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
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67 | // Open Drain, I2C bus pulled high externally
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68 |
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69 | GPIO_Init(GPIOB, &GPIO_InitStructure);
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70 |
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71 | I2C_Cmd(I2C1, ENABLE); //Enable I2C1
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72 |
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73 | //Register I2C ->Seite 539
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74 | I2C_InitStructure.I2C_ClockSpeed=ClockSpeed;
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75 | I2C_InitStructure.I2C_Mode=I2C_Mode_I2C;
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76 | I2C_InitStructure.I2C_DutyCycle=I2C_DutyCycle_2;
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77 | I2C_InitStructure.I2C_OwnAddress1=I2C1_Own_ADDRESS7;
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78 | I2C_InitStructure.I2C_Ack=I2C_Ack_Enable;
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79 | I2C_InitStructure.I2C_AcknowledgedAddress=I2C_AcknowledgedAddress_7bit;
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80 |
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81 | I2C_Init(I2C1, &I2C_InitStructure);
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82 |
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83 | }
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84 |
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85 | void I2C_Write(uint8_t Register_Adress, uint8_t Data){
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86 |
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87 | while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
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88 |
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89 | /* Send I2C1 START condition */
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90 | I2C_GenerateSTART(I2C1, ENABLE);
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91 |
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92 | /* Test on I2C1 EV5 and clear it */
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93 | while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
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94 |
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95 | /* Send slave Address for write */
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96 | I2C_Send7bitAddress(I2C1, I2C1_SLAVE_ADDRESS7, I2C_Direction_Transmitter);
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97 |
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98 | /* Test on I2C1 EV6 and clear it */
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99 | while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
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100 |
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101 | /* Send I2C1 slave register address */
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102 | I2C_SendData(I2C1, Register_Adress);
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103 |
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104 | /* Test on I2C1 EV8_2 and clear it */
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105 | while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
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106 |
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107 | /* Send I2C1 slave Register data */
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108 | I2C_SendData(I2C1, Data);
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109 |
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110 | /* Test on I2C1 EV8_8 and clear it */
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111 | while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
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112 |
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113 | /* Send I2C1 STOP Condition */
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114 | I2C_GenerateSTOP(I2C1, ENABLE);
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115 | }
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116 |
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117 | uint8_t I2C_Read(uint8_t Register_Adress){
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118 |
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119 | uint8_t I2C_ReceivedData=0;
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120 | /*!< While the bus is busy */
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121 | while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)) ;
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122 |
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123 | /*!< Send START condition */
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124 | I2C_GenerateSTART(I2C1, ENABLE);
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125 |
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126 | /*!< Test on EV5 and clear it */
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127 | while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
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128 |
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129 | /*!< Send EEPROM address for write */
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130 | I2C_Send7bitAddress(I2C1, I2C1_SLAVE_ADDRESS7, I2C_Direction_Transmitter);
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131 |
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132 | /*!< Test on EV6 and clear it */
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133 | while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
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134 |
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135 | //send the reg select COMMAND byte
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136 | I2C_SendData(I2C1, Register_Adress);
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137 |
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138 | /*!< Test on EV8 and clear it */
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139 | while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
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140 |
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141 | //send START condition a second time
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142 | I2C_GenerateSTART(I2C1, ENABLE);
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143 |
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144 | /*!< Test on EV5 and clear it */
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145 | while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
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146 |
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147 | /*!< Send EEPROM address for read */
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148 | I2C_Send7bitAddress(I2C1, I2C1_SLAVE_ADDRESS7, I2C_Direction_Receiver);
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149 |
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150 | /*!< Test on EV6 and clear it */
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151 | while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
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152 |
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153 | // /*!< Test on EV7 and clear it */
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154 | if(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))
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155 | {
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156 | /*!< Read a byte from the EEPROM */
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157 | I2C_ReceivedData = I2C_ReceiveData(I2C1);
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158 | }
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159 |
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160 | /*!< Disable Acknowledgement */
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161 | I2C_AcknowledgeConfig(I2C1, DISABLE);
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162 |
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163 | /*!< Send STOP Condition */
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164 | I2C_GenerateSTOP(I2C1, ENABLE);
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165 |
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166 | /*!< Enable Acknowledgement to be ready for another reception */
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167 | I2C_AcknowledgeConfig(I2C1, ENABLE);
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168 |
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169 | return I2C_ReceivedData;
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170 | }
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171 |
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172 | void I2C_Demo(void){
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173 |
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174 | uint8_t I2C_Data=0x00;
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175 | uint8_t I2C_Register_Adress=0x0b;
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176 |
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177 | I2C_Data=I2C_Read(I2C_Register_Adress);
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178 | }
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