N32G43配置串口DMA

#define U3_DMA_SEND_CH    DMA_CH5

#define U3_DMA_RECV_CH    DMA_CH6



uint8_t u3_send_buff[20]={0};

uint8_t u3_recv_buff[20]={0};



DMA_InitType  DMA_UART_TYPE;

        DMA_DeInit(U3_DMA_SEND_CH);

  DMA_UART_TYPE.BufSize=50;

        DMA_UART_TYPE.CircularMode=DMA_MODE_NORMAL;

        DMA_UART_TYPE.Direction=DMA_DIR_PERIPH_DST;

        DMA_UART_TYPE.DMA_MemoryInc=DMA_MEM_INC_ENABLE;

        DMA_UART_TYPE.Mem2Mem=DMA_M2M_DISABLE;

        DMA_UART_TYPE.MemAddr=(uint32_t)u3_send_buff;  //

        DMA_UART_TYPE.MemDataSize=DMA_MemoryDataSize_Byte;

        DMA_UART_TYPE.PeriphAddr=(u32)&(USART3->DAT);

        DMA_UART_TYPE.PeriphDataSize=DMA_PERIPH_DATA_SIZE_BYTE;

        DMA_UART_TYPE.PeriphInc=DMA_PERIPH_INC_DISABLE;

        DMA_UART_TYPE.Priority=DMA_PRIORITY_VERY_HIGH;

        DMA_Init(U3_DMA_SEND_CH,&DMA_UART_TYPE);

        DMA_RequestRemap(DMA_REMAP_USART3_TX, DMA, U3_DMA_SEND_CH, ENABLE);

        DMA_SetCurrDataCounter(U3_DMA_SEND_CH,20);

        DMA_EnableChannel(U3_DMA_SEND_CH, ENABLE);

        

  DMA_InitType  DMA_UART_TYPE_1;

        DMA_DeInit(U3_DMA_RECV_CH);

  DMA_UART_TYPE_1.BufSize=50;

        DMA_UART_TYPE_1.CircularMode=DMA_MODE_NORMAL;

        DMA_UART_TYPE_1.Direction=DMA_DIR_PERIPH_SRC;  //从外设到寄存器

        DMA_UART_TYPE_1.DMA_MemoryInc=DMA_MEM_INC_ENABLE;

        DMA_UART_TYPE_1.Mem2Mem=DMA_M2M_DISABLE;

        DMA_UART_TYPE_1.MemAddr=(uint32_t)u3_recv_buff;  //

        DMA_UART_TYPE_1.MemDataSize=DMA_MemoryDataSize_Byte;

        DMA_UART_TYPE_1.PeriphAddr=(u32)&(USART3->DAT);

        DMA_UART_TYPE_1.PeriphDataSize=DMA_PERIPH_DATA_SIZE_BYTE;

        DMA_UART_TYPE_1.PeriphInc=DMA_PERIPH_INC_DISABLE;

        DMA_UART_TYPE_1.Priority=DMA_PRIORITY_VERY_HIGH;

        DMA_Init(U3_DMA_RECV_CH,&DMA_UART_TYPE_1);

        

        DMA_RequestRemap(DMA_REMAP_USART3_RX, DMA, U3_DMA_RECV_CH, ENABLE);

        USART_EnableDMA(USART3, USART_DMAREQ_RX | USART_DMAREQ_TX, ENABLE);

        DMA_SetCurrDataCounter(U3_DMA_RECV_CH,20);

        DMA_EnableChannel(U3_DMA_RECV_CH, ENABLE);

#define U3_DMA_SEND_CH    DMA_CH5

#define U3_DMA_RECV_CH    DMA_CH6



uint8_t u3_send_buff[20]={0};

uint8_t u3_recv_buff[20]={0};



DMA_InitType  DMA_UART_TYPE;

        DMA_DeInit(U3_DMA_SEND_CH);

  DMA_UART_TYPE.BufSize=50;

        DMA_UART_TYPE.CircularMode=DMA_MODE_NORMAL;

        DMA_UART_TYPE.Direction=DMA_DIR_PERIPH_DST;

        DMA_UART_TYPE.DMA_MemoryInc=DMA_MEM_INC_ENABLE;

        DMA_UART_TYPE.Mem2Mem=DMA_M2M_DISABLE;

        DMA_UART_TYPE.MemAddr=(uint32_t)u3_send_buff;  //

        DMA_UART_TYPE.MemDataSize=DMA_MemoryDataSize_Byte;

        DMA_UART_TYPE.PeriphAddr=(u32)&(USART3->DAT);

        DMA_UART_TYPE.PeriphDataSize=DMA_PERIPH_DATA_SIZE_BYTE;

        DMA_UART_TYPE.PeriphInc=DMA_PERIPH_INC_DISABLE;

        DMA_UART_TYPE.Priority=DMA_PRIORITY_VERY_HIGH;

        DMA_Init(U3_DMA_SEND_CH,&DMA_UART_TYPE);

        DMA_RequestRemap(DMA_REMAP_USART3_TX, DMA, U3_DMA_SEND_CH, ENABLE);

        DMA_SetCurrDataCounter(U3_DMA_SEND_CH,20);

        DMA_EnableChannel(U3_DMA_SEND_CH, ENABLE);

        

  DMA_InitType  DMA_UART_TYPE_1;

        DMA_DeInit(U3_DMA_RECV_CH);

  DMA_UART_TYPE_1.BufSize=50;

        DMA_UART_TYPE_1.CircularMode=DMA_MODE_NORMAL;

        DMA_UART_TYPE_1.Direction=DMA_DIR_PERIPH_SRC;  //从外设到寄存器

        DMA_UART_TYPE_1.DMA_MemoryInc=DMA_MEM_INC_ENABLE;

        DMA_UART_TYPE_1.Mem2Mem=DMA_M2M_DISABLE;

        DMA_UART_TYPE_1.MemAddr=(uint32_t)u3_recv_buff;  //

        DMA_UART_TYPE_1.MemDataSize=DMA_MemoryDataSize_Byte;

        DMA_UART_TYPE_1.PeriphAddr=(u32)&(USART3->DAT);

        DMA_UART_TYPE_1.PeriphDataSize=DMA_PERIPH_DATA_SIZE_BYTE;

        DMA_UART_TYPE_1.PeriphInc=DMA_PERIPH_INC_DISABLE;

        DMA_UART_TYPE_1.Priority=DMA_PRIORITY_VERY_HIGH;

        DMA_Init(U3_DMA_RECV_CH,&DMA_UART_TYPE_1);

        

        DMA_RequestRemap(DMA_REMAP_USART3_RX, DMA, U3_DMA_RECV_CH, ENABLE);

        USART_EnableDMA(USART3, USART_DMAREQ_RX | USART_DMAREQ_TX, ENABLE);

        DMA_SetCurrDataCounter(U3_DMA_RECV_CH,20);

        DMA_EnableChannel(U3_DMA_RECV_CH, ENABLE);