课件详解stm32中usartdma实现

STM32USARTDMASTM32USARTDMA对于没玩过DMA的朋友,这里简单说一下DMA,用自己的语言说吧,那就是,从某个位置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;数据准备完成。这时CUPUSART1_DMA_Buf1FLASH.DMABUF1BUF1DMABUF2,BUF125F080DMABUF2DMABUF1,此时a.DMABUF1断,此时切换DMA的目标缓冲为BUF2,而且切换的过程必须在新的串口数据溢出之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;//外设地址寄存器不递增DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Enable;//内存地址递增DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_Byte;//外设字节为单位DMA_InitStructure.DMA_MemoryDataSize=DMA_PeripheralDataSize_Byte;//内存字节为单位DMA_InitStructure.DMA_Mode=DMA_Mode_Circular;//工作在循环缓存模式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;//此时没有数据准备完成当然FALSEDMA_Cmd(DMA1_Channel5,ENABLE);}//u16externDMA_InitTypeDefvoid{void{GL{DMA_ClearITPendingBit(DMA1_IT_GL5);//清除全部中断标志//转换可操作BUF{DMA_Init(DMA1_Channel5,&DMA_InitStructure);}{DMA_Init(DMA1_Channel5,&DMA_InitStructure);}Buf_Ok=TRUE;}}{{LED1_ON;Buf_Ok=FALSE;//操作了准备好的数据{}Timer1=5000;}if(Timer1==0)}if(Timer1==0)