[研电赛技术支持] GD32实战8__DMA

1. 配置外设地址

2. 配置存储器地址

3. 配置传输数据总数

4. 配置软件优先级，传输方向，模式类型，数据尺寸和中断类型

5. 使能DMA

static VOID UART1_DmaRxConfig(IN U8 *buf, IN U32 len)

{

    DMA_InitPara DMA_InitStructure;

    

    DMA_Enable(DMA1_CHANNEL5, DISABLE);

    

    /* USART1 RX DMA1 Channel (triggered by USART1 Rx event) Config */

    DMA_DeInit(DMA1_CHANNEL5);

    DMA_InitStructure.DMA_PeripheralBaseAddr = (U32) &(USART1->DR);

    DMA_InitStructure.DMA_MemoryBaseAddr = (U32)buf;

    DMA_InitStructure.DMA_DIR = DMA_DIR_PERIPHERALSRC;

    DMA_InitStructure.DMA_BufferSize = len;

    DMA_InitStructure.DMA_PeripheralInc = DMA_PERIPHERALINC_DISABLE;

    DMA_InitStructure.DMA_MemoryInc = DMA_MEMORYINC_ENABLE;

    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PERIPHERALDATASIZE_BYTE;

    DMA_InitStructure.DMA_MemoryDataSize = DMA_MEMORYDATASIZE_BYTE;

    DMA_InitStructure.DMA_Mode = DMA_MODE_NORMAL;

    DMA_InitStructure.DMA_Priority = DMA_PRIORITY_VERYHIGH;

    DMA_InitStructure.DMA_MTOM = DMA_MEMTOMEM_DISABLE;

    DMA_Init(DMA1_CHANNEL5, &DMA_InitStructure);

    DMA_Enable(DMA1_CHANNEL5, ENABLE);

}