[STM32H743] DMA中断服务函数编写流程

    HAL_NVIC_SetPriority(DMA1_Stream0_IRQn, 0, 0);//抢占优先级0，子优先级0
    HAL_NVIC_EnableIRQ(DMA1_Stream0_IRQn);//使能DAC中断通道

2：编写中断服务函数->判断中断服务函数dma传输是否已经传完-> 然后清除中断
注：（建议在中断完成后进行 清中断操作）
（1）如果没有清除中断的操作，则会出现每传输一个数据就进入一次中断，一次DMA中断事件进入n次中断
（2）如果加上清除中断的操作，则是一个周期传输完成后才进入一次中断，这样便能达到自己想要的效果。

void DMA1_Stream0_IRQHandler(void)
{
	 if(__HAL_DMA_GET_FLAG(&hdma_dac1,DMA_FLAG_TCIF0_4))//等待DMA1_Steam0传输完成
	 {
	 //此处编写中断程序
	 //清除中断
	 __HAL_DMA_CLEAR_FLAG(&hdma_dac1,DMA_FLAG_TCIF0_4);//清除DMA1_Steam0传输完成标志 
	}
}

3：注意，要根据自己配置的 DMAx_Streamx 来选择传输完成标志

/* Interrupt & Flag management */

/**
  * @brief  Return the current DMA Stream transfer complete flag.
  * @param  __HANDLE__: DMA handle
  * @retval The specified transfer complete flag index.
  */
#define __HAL_DMA_GET_TC_FLAG_INDEX(__HANDLE__) \
(((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA1_Stream0))? DMA_FLAG_TCIF0_4 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA2_Stream0))? DMA_FLAG_TCIF0_4 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA1_Stream4))? DMA_FLAG_TCIF0_4 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA2_Stream4))? DMA_FLAG_TCIF0_4 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA1_Stream1))? DMA_FLAG_TCIF1_5 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA2_Stream1))? DMA_FLAG_TCIF1_5 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA1_Stream5))? DMA_FLAG_TCIF1_5 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA2_Stream5))? DMA_FLAG_TCIF1_5 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA1_Stream2))? DMA_FLAG_TCIF2_6 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA2_Stream2))? DMA_FLAG_TCIF2_6 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA1_Stream6))? DMA_FLAG_TCIF2_6 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA2_Stream6))? DMA_FLAG_TCIF2_6 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA1_Stream3))? DMA_FLAG_TCIF3_7 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA2_Stream3))? DMA_FLAG_TCIF3_7 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA1_Stream7))? DMA_FLAG_TCIF3_7 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)DMA2_Stream7))? DMA_FLAG_TCIF3_7 :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)BDMA_Channel0))? BDMA_FLAG_TC0    :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)BDMA_Channel1))? BDMA_FLAG_TC1    :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)BDMA_Channel2))? BDMA_FLAG_TC2    :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)BDMA_Channel3))? BDMA_FLAG_TC3    :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)BDMA_Channel4))? BDMA_FLAG_TC4    :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)BDMA_Channel5))? BDMA_FLAG_TC5    :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)BDMA_Channel6))? BDMA_FLAG_TC6    :\
 ((uint32_t)((__HANDLE__)->Instance) == ((uint32_t)BDMA_Channel7))? BDMA_FLAG_TC7    :\
 (uint32_t)0x00000000)