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STM32F103使用串口DMA收发数据的源码该怎样去实现呢

问答对人有帮助，内容完整，我也想知道答案 0 STM32F103使用串口DMA收发数据的源码该怎样去实现呢？ 0
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答案对人有帮助，有参考价值 0 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); //ÏÈÉèÖÃÎª1K´óÐ¡ 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); //³õÊ¼»¯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); } }

2021-12-13 15:20:48 评论举报邢党铿