[ST_MICRO]/STM32F43x2016. 12. 31. 12:51

[STM32F439 EVM] I2C 테스트

[STM32F439 EVM] I2C 테스트




[STM32F439 EVM] 에는 PB8(SCL), PB9(SDA)에 I2C가 할당되어 있다.




STM32F439 I2C 초기화 코드

I2C_HandleTypeDef I2cHandle;


#define I2Cx                             I2C1

#define I2Cx_CLK_ENABLE()                __I2C1_CLK_ENABLE()

#define I2Cx_SDA_GPIO_CLK_ENABLE()       __GPIOB_CLK_ENABLE()

#define I2Cx_SCL_GPIO_CLK_ENABLE()       __GPIOB_CLK_ENABLE() 


#define I2Cx_FORCE_RESET()               __I2C1_FORCE_RESET()

#define I2Cx_RELEASE_RESET()             __I2C1_RELEASE_RESET()


/* Definition for I2Cx Pins */

#define I2Cx_SCL_PIN                    GPIO_PIN_8

#define I2Cx_SCL_GPIO_PORT              GPIOB

#define I2Cx_SCL_AF                     GPIO_AF4_I2C1

#define I2Cx_SDA_PIN                    GPIO_PIN_7

#define I2Cx_SDA_GPIO_PORT              GPIOB

#define I2Cx_SDA_AF                     GPIO_AF4_I2C1


void I2CMaster_Init(void)

{

  GPIO_InitTypeDef  GPIO_InitStruct;

  

  /*##-1- Enable peripherals and GPIO Clocks #################################*/

  /* Enable GPIO TX/RX clock */

  I2Cx_SCL_GPIO_CLK_ENABLE();

  I2Cx_SDA_GPIO_CLK_ENABLE();

  /* Enable I2C1 clock */

  I2Cx_CLK_ENABLE(); 

  

  /*##-2- Configure peripheral GPIO ##########################################*/  

  /* I2C TX GPIO pin configuration  */

  GPIO_InitStruct.Pin       = I2Cx_SCL_PIN;

  GPIO_InitStruct.Mode      = GPIO_MODE_AF_OD;

  GPIO_InitStruct.Pull      = GPIO_PULLUP;

  GPIO_InitStruct.Speed     = GPIO_SPEED_FAST;

  GPIO_InitStruct.Alternate = I2Cx_SCL_AF;

  

  HAL_GPIO_Init(I2Cx_SCL_GPIO_PORT, &GPIO_InitStruct);

    

  /* I2C RX GPIO pin configuration  */

  GPIO_InitStruct.Pin = I2Cx_SDA_PIN;

  GPIO_InitStruct.Alternate = I2Cx_SDA_AF;

    

  HAL_GPIO_Init(I2Cx_SDA_GPIO_PORT, &GPIO_InitStruct);

  

  

  I2cHandle.Instance             = I2Cx;

  

  I2cHandle.Init.AddressingMode  = I2C_ADDRESSINGMODE_7BIT;

  I2cHandle.Init.ClockSpeed      = 100000;

  I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;

  I2cHandle.Init.DutyCycle       = I2C_DUTYCYCLE_2;

  I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_ENABLED;

  I2cHandle.Init.NoStretchMode   = I2C_NOSTRETCH_DISABLED;

  I2cHandle.Init.OwnAddress1     = 0xFE;//I2C_ADDRESS<<1;

  I2cHandle.Init.OwnAddress2     = 0xFE;    

  

  

  HAL_I2C_Init(&I2cHandle);

}




STM32F439 I2C Read/Write 함수

HAL_I2C_Master_Transmit(),  HAL_I2C_Master_Receive() 함수를 사용하면 쉽게 I2C제어가 가능하다.

unsigned char read8(unsigned char addr, unsigned char data)

{

    unsigned char result;


    unsigned char tx_buf[2];

    unsigned char rx_buf[4];

    tx_buf[0] = data;

    

    

    //gTimerTick6 = 0;

    while(HAL_I2C_Master_Transmit(&I2cHandle, (uint16_t)addr, (uint8_t*)tx_buf, 1, 10000)!= HAL_OK)

    {

        //if(gTimerTick6>200)break;

    }

    

    //gTimerTick6 = 0;


    while(HAL_I2C_Master_Receive(&I2cHandle, (uint16_t)addr, (uint8_t *)rx_buf, 1, 10000) != HAL_OK)

    {

//if(gTimerTick6>200)break;

    }

  


    result = rx_buf[0];



    return result;


}


void write8(unsigned char addr, unsigned char reg, unsigned char data)

{

    unsigned char result;


    unsigned char tx_buf[2];

    unsigned char rx_buf[4];

    tx_buf[0] = reg;

tx_buf[1] = data;

    

    

    //gTimerTick6 = 0;

    while(HAL_I2C_Master_Transmit(&I2cHandle, (uint16_t)addr, (uint8_t*)tx_buf, 2, 10000)!= HAL_OK)

    {

        //if(gTimerTick6>200)break;

    }

}


Posted by nexp

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