2018年06月03日 | STM32 I2C 硬件中断方式实现方法

流程图如下：

I2C 中断处理函数如下：

/**
  * @brief  This function handles I2C1 Event interrupt request, tx, rx 
  *         buffer and number of bytes will be changed.
  * @param  None
  * @retval None
  */
void I2C1_EV_IRQHandler(void)
{
#ifdef ARC_I2C_IRQ
    uint32_t i2cEvent;
    I2C_param_struct __IO *pI2C_param;

    pI2C_param = ARC_get_I2C_param();
    i2cEvent = I2C_GetLastEvent(I2C1);
    
    switch (i2cEvent)
    {
        case I2C_EVENT_MASTER_MODE_SELECT:/* EV5 */
            if(pI2C_param->I2C_DIRECTION == ARC_I2C_DIRECTION_TX)
            {
                I2C_Send7bitAddress(I2C1, pI2C_param->DeviceAddr, I2C_Direction_Transmitter);
            }
            else
            {
                I2C_Send7bitAddress(I2C1, pI2C_param->DeviceAddr, I2C_Direction_Receiver);
            }
            break;

        /* Master Transmitter -------------------------------------------------------*/
        case I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED:
            I2C_SendData(I2C1, pI2C_param->SubAddr);
            if(pI2C_param->TxNumOfBytes == 0)
                I2C_ITConfig(I2C1, I2C_IT_BUF, DISABLE);
            break;
           
        case I2C_EVENT_MASTER_BYTE_TRANSMITTING:  /* Without BTF, EV8 */     
            if(pI2C_param->TX_I2C_Index < pI2C_param->TxNumOfBytes)
            {
                I2C_SendData(I2C1, pI2C_param->TxData[pI2C_param->TX_I2C_Index++]);
            }
            else 
            {      
                I2C_ITConfig(I2C1, I2C_IT_BUF, DISABLE);
            }
            break;

        case I2C_EVENT_MASTER_BYTE_TRANSMITTED: /* With BTF EV8-2 */
           if(pI2C_param->TX_Generate_stop == 1)
           {
             I2C_GenerateSTOP(I2C1, ENABLE);
             I2C_ITConfig(I2C1, I2C_IT_EVT, DISABLE);
           }
           else
           {
             pI2C_param->I2C_DIRECTION = ARC_I2C_DIRECTION_RX;
             I2C_ITConfig(I2C1, I2C_IT_BUF, ENABLE);
             I2C_GenerateSTART(I2C1, ENABLE);
           }
           break;

        /* Master Receiver -------------------------------------------------------*/
        case I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED:
            if(pI2C_param->RX_I2C_Index == (pI2C_param->RxNumOfBytes - 1))
            {
                I2C_AcknowledgeConfig(I2C1, DISABLE);
                I2C_GenerateSTOP(I2C1, ENABLE);
            }
            break;

        case I2C_EVENT_MASTER_BYTE_RECEIVED:
            pI2C_param->RxData[pI2C_param->RX_I2C_Index++] = I2C_ReceiveData (I2C1);
            if(pI2C_param->RX_I2C_Index == (pI2C_param->RxNumOfBytes - 1))
            {
                I2C_AcknowledgeConfig(I2C1, DISABLE);
                I2C_GenerateSTOP(I2C1, ENABLE);
            }
            break;

        default:
            break;
    }

#endif
}