STM32F302C8T6硬件I2C出现SDA有波形输出SCL一直为高

只看该作者 · 2016-10-26 17:05

本人在一个项目中使用了STM32F302C8T6这个芯片，碰到硬件I2C奇怪的问题，过程如下：

1、通过STM32CubeMX生成初始代码；

2、初始代码如下；

void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)

{



  GPIO_InitTypeDef GPIO_InitStruct;

  if(hi2c->Instance==I2C2)

  {

  /* USER CODE BEGIN I2C2_MspInit 0 */



  /* USER CODE END I2C2_MspInit 0 */

  

    /**I2C2 GPIO Configuration    

    PA9     ------> I2C2_SCL

    PA10     ------> I2C2_SDA 

    */

    GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_10;

    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;

    GPIO_InitStruct.Pull = GPIO_PULLUP;

    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;

    GPIO_InitStruct.Alternate = GPIO_AF4_I2C2;

    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);



    /* Peripheral clock enable */

    __HAL_RCC_I2C2_CLK_ENABLE();

  /* USER CODE BEGIN I2C2_MspInit 1 */



  /* USER CODE END I2C2_MspInit 1 */

  }



}



/* I2C2 init function */

static void MX_I2C2_Init(void)

{



  hi2c2.Instance = I2C2;

  hi2c2.Init.Timing = 0x0010020A;

  hi2c2.Init.OwnAddress1 = 0;

  hi2c2.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;

  hi2c2.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;

  hi2c2.Init.OwnAddress2 = 0;

  hi2c2.Init.OwnAddress2Masks = I2C_OA2_NOMASK;

  hi2c2.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;

  hi2c2.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;

  if (HAL_I2C_Init(&hi2c2) != HAL_OK)

  {

    Error_Handler();

  }



    /**Configure Analogue filter 

    */

  if (HAL_I2CEx_ConfigAnalogFilter(&hi2c2, I2C_ANALOGFILTER_ENABLE) != HAL_OK)

  {

    Error_Handler();

  }



}

3、循环发送数据；

复制

int main(void)

{



  /* USER CODE BEGIN 1 */

    uint8_t data[2] = {0x75, 0x04};

  /* USER CODE END 1 */



  /* MCU Configuration----------------------------------------------------------*/



  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */

  HAL_Init();



  /* Configure the system clock */

  SystemClock_Config();



  /* Initialize all configured peripherals */

  MX_GPIO_Init();

  MX_I2C2_Init();



  /* USER CODE BEGIN 2 */

    if(HAL_OK != HAL_I2C_IsDeviceReady(&hi2c2, (uint16_t)0xD0, 3, 1000))

    {

        hi2c2.Instance->CR1 |= I2C_CR1_SWRST;

        hi2c2.Instance->CR1 &= ~I2C_CR1_SWRST;

        HAL_Delay(2);

    }



  /* USER CODE END 2 */



  /* Infinite loop */

  /* USER CODE BEGIN WHILE */

    while(1)

    {

  /* USER CODE END WHILE */



  /* USER CODE BEGIN 3 */

        HAL_Delay(20);

        HAL_I2C_Master_Transmit(&hi2c2, (uint16_t)0xD0, data, sizeof(data), 5);

    }



  /* USER CODE END 3 */



}