2020-09-21 STM32 I2C专题

开启中断，接收到数据时会调用回调函数

要发送接收都有了,还有非阻塞的,然后通过回调函数来实现功能,真是非常方便的,

库函数回调如下：

void HAL_I2C_MasterRxCpltCallback(I2C_HandleTypeDef *I2cHandle)
{
/* Toggle LED2: Transfer in reception process is correct */

//add user code 1 john
BSP_LED_Toggle(LED2);
}

void HAL_I2C_MasterTxCpltCallback(I2C_HandleTypeDef *I2cHandle)
{
/* Toggle LED2: Transfer in transmission process is correct */
BSP_LED_Toggle(LED2);

//add user code 2 john
}

可以实现I2C接收消息的异步,效率也是更高。

ST提供I2C接口有：

 (#) Blocking mode functions are :
        (++) HAL_I2C_Master_Transmit()
        (++) HAL_I2C_Master_Receive()
        (++) HAL_I2C_Slave_Transmit()
        (++) HAL_I2C_Slave_Receive()
        (++) HAL_I2C_Mem_Write()
        (++) HAL_I2C_Mem_Read()
        (++) HAL_I2C_IsDeviceReady()
    (#) No-Blocking mode functions with Interrupt are :
        (++) HAL_I2C_Master_Transmit_IT()
        (++) HAL_I2C_Master_Receive_IT()
        (++) HAL_I2C_Slave_Transmit_IT()
        (++) HAL_I2C_Slave_Receive_IT()
        (++) HAL_I2C_Mem_Write_IT()
        (++) HAL_I2C_Mem_Read_IT()
    (#) No-Blocking mode functions with DMA are :
        (++) HAL_I2C_Master_Transmit_DMA()
        (++) HAL_I2C_Master_Receive_DMA()
        (++) HAL_I2C_Slave_Transmit_DMA()
        (++) HAL_I2C_Slave_Receive_DMA()
        (++) HAL_I2C_Mem_Write_DMA()
        (++) HAL_I2C_Mem_Read_DMA()
    (#) A set of Transfer Complete Callbacks are provided in non Blocking mode:
        (++) HAL_I2C_MemTxCpltCallback()
        (++) HAL_I2C_MemRxCpltCallback()
        (++) HAL_I2C_MasterTxCpltCallback()
        (++) HAL_I2C_MasterRxCpltCallback()
        (++) HAL_I2C_SlaveTxCpltCallback()
        (++) HAL_I2C_SlaveRxCpltCallback()
        (++) HAL_I2C_ErrorCallback()

官方代码案例：

//主机模式发送  
/* Timeout is set to 10S */
  while(HAL_I2C_Master_Transmit(&hi2c1, (uint16_t)I2C_ADDRESS, (uint8_t*)aTxBuffer, TXBUFFERSIZE, 10000)!= HAL_OK)
  {
    /* Error_Handler() function is called when Timeout error occurs.
       When Acknowledge failure occurs (Slave don't acknowledge its address)
       Master restarts communication */
    if (HAL_I2C_GetError(&hi2c1) != HAL_I2C_ERROR_AF)
    {
      Error_Handler();
    }
  }

//主机模式接收
/* Timeout is set to 10S */ 
  while(HAL_I2C_Master_Receive(&hi2c1, (uint16_t)I2C_ADDRESS, (uint8_t *)aRxBuffer, RXBUFFERSIZE, 10000) != HAL_OK)
  {
    /* Error_Handler() function is called when Timeout error occurs.
       When Acknowledge failure occurs (Slave don't acknowledge it's address)
       Master restarts communication */
    if (HAL_I2C_GetError(&hi2c1) != HAL_I2C_ERROR_AF)
    {
      Error_Handler();
    }
  }

//从机模式接收
/* Timeout is set to 10S  */
  if(HAL_I2C_Slave_Receive(&hi2c1, (uint8_t *)aRxBuffer, RXBUFFERSIZE, 10000) != HAL_OK)
  {
    /* Transfer error in reception process */
    Error_Handler();
  }
  
//从机模式发送
  /* Timeout is set to 10S */
  if(HAL_I2C_Slave_Transmit(&hi2c1, (uint8_t*)aTxBuffer, TXBUFFERSIZE, 10000)!= HAL_OK)
  {
    /* Transfer error in transmission process */
    Error_Handler();    
  }

//错误回调函数
/**
  * @brief  I2C error callbacks.
  * @param  I2cHandle: I2C handle
  * @note   This example shows a simple way to report transfer error, and you can
  *         add your own implementation.
  * @retval None
  */
void HAL_I2C_ErrorCallback(I2C_HandleTypeDef *I2cHandle)
{
  //
}