__HAL_DMA_CLEAR_FLAG: Clear the DMA Stream pending flags.

[son1]

Posted on December 16, 2015 at 04:39/**  * @brief  Clear the DMA Stream pending flags.  * @param  __HANDLE__: DMA handle  * @param  __FLAG__: specifies the flag to clear.  *          This parameter can be any combination of the following values:  *            @arg DMA_FLAG_TCIFx: Transfer complete flag.  *            @arg DMA_FLAG_HTIFx: Half transfer complete flag.  *            @arg DMA_FLAG_TEIFx: Transfer error flag.  *            @arg DMA_FLAG_DMEIFx: Direct mode error flag.  *            @arg DMA_FLAG_FEIFx: FIFO error flag.  *         Where x can be 0_4, 1_5, 2_6 or 3_7 to select the DMA Stream flag.     * @retval None  */#define __HAL_DMA_CLEAR_FLAG(__HANDLE__, __FLAG__) \(((uint32_t)((__HANDLE__)->Instance) > (uint32_t)DMA2_Stream3)? (DMA2->HIFCR = (__FLAG__)) :\ ((uint32_t)((__HANDLE__)->Instance) > (uint32_t)DMA1_Stream7)? (DMA2->LIFCR = (__FLAG__)) :\ ((uint32_t)((__HANDLE__)->Instance) > (uint32_t)DMA1_Stream3)? (DMA1->HIFCR = (__FLAG__)) : (DMA1->LIFCR = (__FLAG__)))I don't understand how the code from ST HAL can clear the flag?

[waclawek.jan]

Posted on December 16, 2015 at 06:47

Read the DMAx_HIFCR/DMAx_LIFCR registers description in the Reference Manual.

The description in the comment may be misleading - it does not clear a pending DMA transfer, it clears the status flags of the DMA stream. JW