dma刚开始使用，不知道对不对

只看该作者 · 2021-9-7 17:44

void USARTx_DMA_Config(void)

{

                DMA_InitTypeDef DMA_InitStructure;



                RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    DMA_InitStructure.DMA_PeripheralBaseAddr = USART_DR_ADDRESS;

                DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SendBuff;

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;

DMA_InitStructure.DMA_BufferSize = SENDBUFF_SIZE;

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_Mode = DMA_Mode_Circular;        

DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; 

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

DMA_Init(USART_TX_DMA_CHANNEL, &DMA_InitStructure);                

DMA_Cmd (USART_TX_DMA_CHANNEL,ENABLE);

}