SMT32F7DMA目的地址和原地址设置问题。

suebillt

[mw_shl_code=c,true] hdma_uart7_rx.Instance = DMA1_Stream3; hdma_uart7_rx.Init.Channel = DMA_CHANNEL_5; hdma_uart7_rx.Init.Direction = DMA_PERIPH_TO_MEMORY; hdma_uart7_rx.Init.PeriphInc = DMA_PINC_DISABLE; hdma_uart7_rx.Init.MemInc = DMA_MINC_DISABLE; hdma_uart7_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE; hdma_uart7_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE; hdma_uart7_rx.Init.Mode = DMA_NORMAL; hdma_uart7_rx.Init.Priority = DMA_PRIORITY_VERY_HIGH; hdma_uart7_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE; hdma_uart7_rx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL; hdma_uart7_rx.Init.MemBurst = DMA_MBURST_SINGLE; hdma_uart7_rx.Init.PeriphBurst = DMA_PBURST_SINGLE; HAL_DMA_Init(&hdma_uart7_rx);[/mw_shl_code]

上面没有一个是设置目的地址和源地址的，只有下面这句

[mw_shl_code=c,true] __HAL_LINKDMA(huart,hdmarx,hdma_uart7_rx);[/mw_shl_code]

具体的宏是

[mw_shl_code=c,true]#define __HAL_LINKDMA(__HANDLE__, __PPP_DMA_FIELD__, __DMA_HANDLE__) \ do{ \ (__HANDLE__)->__PPP_DMA_FIELD__ = &(__DMA_HANDLE__); \ (__DMA_HANDLE__).Parent = (__HANDLE__); \ } while(0)[/mw_shl_code]

不是很理解，我换成
hdma_uart7_rx.Instance->AR=(uint32_t)&UART7->RDR;
然后用printf打印出来是0

[mw_shl_code=c,true]buff11[2]=(uint32_t)hdma_uart7_rx.Instance->AR;//->AR; printf("\r\n%x",buff11[2]);[/mw_shl_code]

还望原子哥指点迷津，F7的HAL好难搞啊

正点原子

看寄存器描述,应该有介绍一个位,可以控制传输方向,是外设到存储器,还是存储器到外设.
STM32F4的是:


DMA2_Stream1->CR|=0<<6; //外设到存储器模式 

CR寄存器的第六位.

你自己找吧.

suebillt

回复【2楼】正点原子:
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目的地址没有设置