STM32U575板子DMA传输失败的问题

chenbingjy

我有一块STM32U575的开发板，有一个DMA的例程，把FLASH里的内容传到RAM.
它用的是32位传，也就是字传。
我试图把它改成半字传。
以下是我的一部分程序：

1. DMA_HandleTypeDef handle_GPDMA1_Channel15;
   
2. 
   
3. 
   
4. static const uint16_t aSRC_Const_Buffer1[BUFFER_SIZE] =
   
5. {
   
6.   0x0102,0x0304, 0x0506,0x0708,
   
7.         0x090a,0x0b0c,0x0d0e,0x0f10,
   
8.         0x1112,0x1314,0x1516,0x1718,
   
9.         0x191a,0x1b1c,0x1d1e,0x1f20,
   
10.         0x0102,0x0304, 0x0506,0x0708,
    
11.         0x090a,0x0b0c,0x0d0e,0x0f10,
    
12.         0x1112,0x1314,0x1516,0x1718,
    
13.         0x191a,0x1b1c,0x1d1e,0x1f20
    
14.   
    
15. };
    
16. 
    
17. static uint16_t aDST_Buffer1[BUFFER_SIZE];

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原来的启动传输函数是按字传的，我改为半字传，所以原来的函数就不能用了，我自己写了一个

1. HAL_StatusTypeDef HAL_DMA_Start_IT1(DMA_HandleTypeDef *const hdma,
   
2.                                    uint16_t SrcAddress,
   
3.                                    uint16_t DstAddress,
   
4.                                    uint32_t SrcDataSize)
   
5. {
   
6.   /* Check the DMA peripheral handle parameter */
   
7.   if (hdma == NULL)
   
8.   {
   
9.     return HAL_ERROR;
   
10.   }
    
11. 
    
12.   /* Check the parameters */
    
13.   assert_param(IS_DMA_BLOCK_SIZE(SrcDataSize));
    
14. 
    
15.   /* Process locked */
    
16.   __HAL_LOCK(hdma);
    
17. 
    
18.   /* Check DMA channel state */
    
19.   if (hdma->State == HAL_DMA_STATE_READY)
    
20.   {
    
21.     /* Update the DMA channel state */
    
22.     hdma->State = HAL_DMA_STATE_BUSY;
    
23. 
    
24.     /* Update the DMA channel error code */
    
25.     hdma->ErrorCode = HAL_DMA_ERROR_NONE;
    
26. 
    
27.     /* Configure the source address, destination address, the data size and clear flags */
    
28.     DMA_SetConfig1(hdma, SrcAddress, DstAddress, SrcDataSize);
    
29. 
    
30.     /* Enable common interrupts: Transfer Complete and Transfer Errors ITs */
    
31.     __HAL_DMA_ENABLE_IT(hdma, (DMA_IT_TC | DMA_IT_DTE | DMA_IT_ULE | DMA_IT_USE | DMA_IT_TO));
    
32. 
    
33.     /* Check half transfer complete callback */
    
34.     if (hdma->XferHalfCpltCallback != NULL)
    
35.     {
    
36.       /* If Half Transfer complete callback is set, enable the corresponding IT */
    
37.       __HAL_DMA_ENABLE_IT(hdma, DMA_IT_HT);
    
38.     }
    
39. 
    
40.     /* Check Half suspend callback */
    
41.     if (hdma->XferSuspendCallback != NULL)
    
42.     {
    
43.       /* If Transfer suspend callback is set, enable the corresponding IT */
    
44.       __HAL_DMA_ENABLE_IT(hdma, DMA_IT_SUSP);
    
45.     }
    
46. 
    
47.     /* Enable DMA channel */
    
48.     __HAL_DMA_ENABLE(hdma);
    
49.   }
    
50.   else
    
51.   {
    
52.     /* Update the DMA channel error code */
    
53.     hdma->ErrorCode = HAL_DMA_ERROR_BUSY;
    
54. 
    
55.     /* Process unlocked */
    
56.     __HAL_UNLOCK(hdma);
    
57. 
    
58.     return HAL_ERROR;
    
59.   }
    
60. 
    
61.   return HAL_OK;
    
62. }
    

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DMA_SetConfig1(hdma, SrcAddress, DstAddress, SrcDataSize);这个函数原来也是按32位来写的，我也进行了改写

1. static void DMA_SetConfig1(DMA_HandleTypeDef const *const hdma,
   
2.                           uint16_t SrcAddress,
   
3.                           uint16_t DstAddress,
   
4.                           uint32_t SrcDataSize)
   
5. {
   
6.   /* Configure the DMA channel data size */
   
7.   MODIFY_REG(hdma->Instance->CBR1, DMA_CBR1_BNDT, (SrcDataSize & DMA_CBR1_BNDT));
   
8. 
   
9.   /* Clear all interrupt flags */
   
10.   __HAL_DMA_CLEAR_FLAG(hdma, DMA_FLAG_TC | DMA_FLAG_HT | DMA_FLAG_DTE | DMA_FLAG_ULE | DMA_FLAG_USE | DMA_FLAG_SUSP |
    
11.                        DMA_FLAG_TO);
    
12. 
    
13.   /* Configure DMA channel source address */
    
14.   hdma->Instance->CSAR = SrcAddress;
    
15. 
    
16.   /* Configure DMA channel destination address */
    
17.   hdma->Instance->CDAR = DstAddress;
    
18. }
    

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初始化DMA函数我把字改为半字：

1. static void MX_GPDMA1_Init(void)
   
2. {
   
3. 
   
4.   /* USER CODE BEGIN GPDMA1_Init 0 */
   
5. 
   
6.   /* USER CODE END GPDMA1_Init 0 */
   
7. 
   
8.   /* Peripheral clock enable */
   
9.   __HAL_RCC_GPDMA1_CLK_ENABLE();
   
10. 
    
11.   /* GPDMA1 interrupt Init */
    
12.     HAL_NVIC_SetPriority(GPDMA1_Channel15_IRQn, 0, 0);
    
13.     HAL_NVIC_EnableIRQ(GPDMA1_Channel15_IRQn);
    
14. 
    
15.   /* USER CODE BEGIN GPDMA1_Init 1 */
    
16. 
    
17.   /* USER CODE END GPDMA1_Init 1 */
    
18.   handle_GPDMA1_Channel15.Instance = GPDMA1_Channel15;
    
19.   handle_GPDMA1_Channel15.Init.Request = DMA_REQUEST_SW;
    
20.   handle_GPDMA1_Channel15.Init.BlkHWRequest = DMA_BREQ_SINGLE_BURST;
    
21.   handle_GPDMA1_Channel15.Init.Direction = DMA_MEMORY_TO_MEMORY;
    
22.   handle_GPDMA1_Channel15.Init.SrcInc = DMA_SINC_INCREMENTED;
    
23.   handle_GPDMA1_Channel15.Init.DestInc = DMA_DINC_INCREMENTED;
    
24.   //handle_GPDMA1_Channel15.Init.SrcDataWidth = DMA_SRC_DATAWIDTH_WORD;
    
25.         handle_GPDMA1_Channel15.Init.SrcDataWidth = DMA_SRC_DATAWIDTH_HALFWORD;
    
26.   //handle_GPDMA1_Channel15.Init.DestDataWidth = DMA_DEST_DATAWIDTH_WORD;
    
27.         handle_GPDMA1_Channel15.Init.DestDataWidth = DMA_SRC_DATAWIDTH_HALFWORD;
    
28.   handle_GPDMA1_Channel15.Init.Priority = DMA_LOW_PRIORITY_HIGH_WEIGHT;
    
29.   handle_GPDMA1_Channel15.Init.SrcBurstLength = 1;
    
30.   handle_GPDMA1_Channel15.Init.DestBurstLength = 1;
    
31.   handle_GPDMA1_Channel15.Init.TransferAllocatedPort = DMA_SRC_ALLOCATED_PORT0|DMA_DEST_ALLOCATED_PORT1;
    
32.         //handle_GPDMA1_Channel15.Init.TransferAllocatedPort = 0x0000|0x4000;
    
33.   handle_GPDMA1_Channel15.Init.TransferEventMode = DMA_TCEM_BLOCK_TRANSFER;
    
34.   handle_GPDMA1_Channel15.Init.Mode = DMA_NORMAL;
    
35.   if (HAL_DMA_Init(&handle_GPDMA1_Channel15) != HAL_OK)
    
36.   {
    
37.     Error_Handler();
    
38.   }
    
39.   if (HAL_DMA_ConfigChannelAttributes(&handle_GPDMA1_Channel15, DMA_CHANNEL_NPRIV) != HAL_OK)
    
40.   {
    
41.     Error_Handler();
    
42.   }
    
43.   /* USER CODE BEGIN GPDMA1_Init 2 */
    
44. 
    
45.   /* USER CODE END GPDMA1_Init 2 */
    
46. 
    
47. }
    

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结果不成功，什么也没传过去。
还有一点，这句if (HAL_DMA_Start_IT1(&handle_GPDMA1_Channel15, (uint16_t)&aSRC_Const_Buffer1, (uint16_t *)&aDST_Buffer1, (BUFFER_SIZE * 2U)) != HAL_OK)
有两个警告：

我搞不懂，为什么穿不过去？问题出在哪？谢谢！