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Код: Выделить всё

void UART_INIT(void){
	USART_InitTypeDef USART_InitStructure;

	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

	USART_DeInit(USART1);

	USART_InitStructure.USART_BaudRate = 4000000;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
	USART_InitStructure.USART_Parity = USART_Parity_No;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Rx;
	USART_OverSampling8Cmd(USART1, ENABLE);
	USART_Init(USART1,&USART_InitStructure);
	USART_Cmd(USART1, ENABLE);	
}

void DMA_INIT(uint32_t* dma_buf_0, uint32_t* dma_buf_1 ){
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
	/* Configure RX DMA  double buffering DMA2_Stream5 Channel 4 USART1_RX */	
	DMA_DeInit(DMA2_Stream5);

	DMA_USARTStructure.DMA_Channel = DMA_Channel_4;
	DMA_USARTStructure.DMA_PeripheralBaseAddr =(uint32_t) (&(USART1->DR)) ;
	DMA_USARTStructure.DMA_Memory0BaseAddr = (uint32_t) dma_buf_0; 
	DMA_USARTStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;	
	DMA_USARTStructure.DMA_BufferSize =   (uint32_t) RECEIVE_BUF_SIZE;
	DMA_USARTStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
	DMA_USARTStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
	DMA_USARTStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
	DMA_USARTStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
	DMA_USARTStructure.DMA_Mode = DMA_Mode_Circular;
	DMA_USARTStructure.DMA_Priority = DMA_Priority_Medium;
	DMA_USARTStructure.DMA_FIFOMode = DMA_FIFOMode_Enable;
	DMA_USARTStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
	DMA_USARTStructure.DMA_MemoryBurst = DMA_MemoryBurst_INC16 ;
	DMA_USARTStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

	DMA_DoubleBufferModeConfig(DMA2_Stream5, (uint32_t) dma_buf_1, DMA_Memory_0);
	DMA_DoubleBufferModeCmd(DMA2_Stream5, ENABLE);	
	DMA_Init(DMA2_Stream5,&DMA_USARTStructure);	
	
	/* Enable DMA Stream Transfer Complete interrupt */
	DMA_ITConfig(DMA2_Stream5, DMA_IT_TC, ENABLE);
	
	/* Enable DMA USART RX Stream */
	USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);		
	DMA_Cmd(DMA2_Stream5,ENABLE);
}

Код: Выделить всё

void DMA2_Stream5_IRQHandler(void){

	if (DMA_GetFlagStatus(DMA2_Stream5, DMA_FLAG_TCIF5) == SET){ 
		DMA_ClearFlag(DMA2_Stream5, DMA_FLAG_TCIF5);
		
		if  ( DMA_GetCurrentMemoryTarget(DMA2_Stream5) == 0 )
			bufInfoSDWrite.buf = (uint32_t*) DMA2_Stream5->M1AR;
		else
			bufInfoSDWrite.buf= (uint32_t*) DMA2_Stream5->M0AR;
	
		bufInfoSDWrite.bufSize = RECEIVE_BUF_SIZE;
	
		DeviceMode = DEVICE_MODE_SD_WRITE;
	}
}