課件詳解stm32中usartdma實現(xiàn)

STM32USARTDMASTM32USARTDMA對于沒玩過DMA的朋友,這里簡單說一下DMA,用自己的語言說吧,那就是,從某個位置DMA,CPUDMA:A.B,搬到哪里去;C;D:DMA.CPUDMA_InitStructure.DMA_MemoryInc=u8USART1_DMA_Buf1[512];512DMA（5）DMAu8USART1_DMA_Buf2[512];Free_Buf_No=BUF_NO1;Buf_Ok=TRUE;數(shù)據(jù)準備完成。這時CUPUSART1_DMA_Buf1FLASH.DMABUF1BUF1DMABUF2,BUF125F080DMABUF2DMABUF1,此時a.DMABUF1斷,此時切換DMA的目標緩沖為BUF2,而且切換的過程必須在新的串口數(shù)據(jù)溢出之USARTFLASH#defineSRC_USART1_DR(&(USART1->DR))u8USART1_DMA_Buf1[512];u8boolBuf_Ok;//BUFBUF_NOFree_Buf_No;boolBuf_Ok;//BUFBUF_NOFree_Buf_No;BUFtypedefenumDMA_InitTypeDefvoid{DMA_InitStructure.DMA_PeripheralBaseAddr(u32)SRC_USART1_DR;BUF&(USART1-DMA_InitStructure.DMA_MemoryBaseAddr(u32)USART1_DMA_Buf1;BUFDMA_InitStructure.DMA_BufferSize=512;//DMADMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;//外設地址寄存器不遞增DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Enable;//內存地址遞增DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_Byte;//外設字節(jié)為單位DMA_InitStructure.DMA_MemoryDataSize=DMA_PeripheralDataSize_Byte;//內存字節(jié)為單位DMA_InitStructure.DMA_Mode=DMA_Mode_Circular;//工作在循環(huán)緩存模式DMA_InitStructure.DMA_Priority=DMA_Priority_High;//4DMA_InitStructure.DMA_M2MDMA_M2M_Disable;道1寄存器DMA_ITConfig(DMA1_Channel5,DMA_IT_TC,ENABLE);//DMA5Free_Buf_No=BUF_NO2;DMA_InitStructure.DMA_MemoryBaseAddr(u32)USART1_DMA_Buf1;Buf_Ok=FALSE;//此時沒有數(shù)據(jù)準備完成當然FALSEDMA_Cmd(DMA1_Channel5,ENABLE);}//u16externDMA_InitTypeDefvoid{void{GL{DMA_ClearITPendingBit(DMA1_IT_GL5);//清除全部中斷標志//轉換可操作BUF{DMA_Init(DMA1_Channel5,&DMA_InitStructure);}{DMA_Init(DMA1_Channel5,&DMA_InitStructure);}Buf_Ok=TRUE;}}{{LED1_ON;Buf_Ok=FALSE;//操作了準備好的數(shù)據(jù){}Timer1=5000;}if(Timer1==0)}if(Timer1==0)