[STM32H743] DMA中断服务函数编写流程

爱被打了一巴掌 2021-09-20 23:30 696阅读 0赞

### \[STM32H743\] 一次DMA中断事件进入n次中断 ###

1：首先->配置中断  
/\* 开启DMA1 Stream0的中断 \*/

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)