STM32 I2C硬件中断方式实现方法

STM32

STM32 I2C硬件中断方式实现方法流程图：

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
}
文件请看附件：
i2c_api.rar (4.13 KB, 下载次数: 212 )

具体实例，使用硬件”I2C“ 访问EEPROM.
12_I2C.pdf (615.08 KB, 下载次数: 151 )