STM32F103使用串口DMA接收发送数据源码分享

u8 gprsTxBuf[100];
u8 gprsRxBuf[1500];
//接收DMA初始化
void tx_dma_init(void)
{
	DMA_InitTypeDef 	DMA_InitStructure;
	
	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
	
	DMA_Cmd(DMA1_Channel7, DISABLE);  
	DMA_DeInit(DMA1_Channel7);
	DMA_InitStructure.DMA_BufferSize=sizeof(gprsTxBuf);				//ÏÈÉèÖÃΪ1K´óС
	DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralDST;
	DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;		
	DMA_InitStructure.DMA_MemoryBaseAddr=(uint32_t)gprsTxBuf;
	DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_Byte;
	DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Enable;
	DMA_InitStructure.DMA_Mode=DMA_Mode_Normal;
	DMA_InitStructure.DMA_PeripheralBaseAddr=(u32)&USART2->DR;
	DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_Byte;
	DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;
	DMA_InitStructure.DMA_Priority=DMA_Priority_High;
	DMA_Init(DMA1_Channel7,&DMA_InitStructure);		//³õʼ»¯TXµÄDMA
}
//发送DMA初始化
void rx_dma_init(void)
{
	DMA_InitTypeDef DMA_InitStructure;

	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
	DMA_InitStructure.DMA_PeripheralBaseAddr = USART_DR_ADDRESS;
	DMA_InitStructure.DMA_MemoryBaseAddr = (u32)gprsRxBuf;
	DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
	DMA_InitStructure.DMA_BufferSize = sizeof(gprsRxBuf);
	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_High;
	DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;	   
	DMA_Init(DMA1_Channel6, &DMA_InitStructure);
	DMA_Cmd (DMA1_Channel6,ENABLE);
}


//串口初始化
void uart_init(void)
{
	GPIO_InitTypeDef   GPIO_InitStructure;   
	USART_InitTypeDef  USART_InitStructure;	 
	NVIC_InitTypeDef   NVIC_InitStructure;	
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA	, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	NVIC_InitStructure.NVIC_IRQChannel=USART2_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
	NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
	NVIC_Init(&NVIC_InitStructure);
	
	USART_InitStructure.USART_BaudRate = 115200;
	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_Mode_Tx;
	USART_Init(USART2, &USART_InitStructure);
	
	USART_DMACmd(USART2,USART_DMAReq_Tx,ENABLE);
	USART_DMACmd(USART2,USART_DMAReq_Rx,ENABLE);
	
	USART_ClearFlag(USART2,USART_FLAG_RXNE);
	USART_ClearFlag(USART2, USART_FLAG_TC);
	USART_ITConfig(USART2,USART_IT_IDLE,ENABLE);
	
	USART_Cmd(USART2, ENABLE);
}
//DMA发送数据
void send_commend(u8 *buf,u16 size)
{
	memset(gprsTxBuf,0,100);
	memcpy(gprsTxBuf,buf,size);
	
	DMA_Cmd(DMA1_Channel7,DISABLE);
	DMA_SetCurrDataCounter(DMA1_Channel7,size);
	DMA_Cmd(DMA1_Channel7,ENABLE);
}

void gprs_dma_reset()
{
    DMA_Cmd(DMA1_Channel6, DISABLE ); 
    DMA_SetCurrDataCounter(DMA1_Channel6, sizeof(gprsRxBuf));
    DMA_Cmd(DMA1_Channel6, ENABLE);  
}

extern u8 gprsRecOverFlag;
extern u16 gprsRecCnt;
void USART2_IRQHandler(void)            
{

	u16 uartRecCnt=0;

	if(USART_GetITStatus(USART2, USART_IT_IDLE) != RESET)
	{
		USART_ReceiveData(USART2);
		uartRecCnt = sizeof(gprsRxBuf) - DMA_GetCurrDataCounter(DMA1_Channel6); 
		//**********************//
		gprsRecOverFlag=1;
		gprsRecCnt=uartRecCnt;
		//*************************************//
		gprs_dma_reset();              
		USART_ClearITPendingBit(USART2,USART_IT_IDLE);    
	}
}