STM32F407的串口采用DMA收发数据

主机:WIN8

开发环境:MDK5.13

mcu: stm32f407VGT6

说明:

之前用STM32F103实现DMA收发串口数据，现在项目中采用STM32F407，所以将此机制移植到F4上。

STM32F103上用DMA收发串口数据文章：

STM32的串口采用DMA方式发送数据测试

STM32的串口采用DMA方式接收数据测试

源代码：

串口初始化代码：

/** 初始化串口/static void init_uart(void){//定义中断结构体NVIC_InitTypeDef NVIC_InitStructure ;//定义IO初始化结构体GPIO_InitTypeDef GPIO_InitStructure;//定义串口结构体 USART_InitTypeDef USART_InitStructure;//定义DMA结构体DMA_InitTypeDef DMA_InitStructure;//打开串口对应的外设时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);//串口发DMA配置 //启动DMA时钟RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);//DMA发送中断设置NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream6_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);//DMA通道配置DMA_DeInit(DMA1_Stream6);DMA_InitStructure.DMA_Channel = DMA_Channel_4; //外设地址DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&USART2->DR);//内存地址DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Tx_Buf_Gsm;//dma传输方向DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;//设置DMA在传输时缓冲区的长度DMA_InitStructure.DMA_BufferSize = TX_LEN_GSM;//设置DMA的外设递增模式，一个外设DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//设置DMA的内存递增模式DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//外设数据字长DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;//内存数据字长DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte;//设置DMA的传输模式DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//设置DMA的优先级别DMA_InitStructure.DMA_Priority = DMA_Priority_High;//指定如果FIFO模式或直接模式将用于指定的流 ： 不使能FIFO模式 DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //指定了FIFO阈值水平DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; //指定的Burst转移配置内存传输 DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //指定的Burst转移配置外围转移 */ DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //配置DMA1的通道 DMA_Init(DMA1_Stream6, &DMA_InitStructure); //使能中断DMA_ITConfig(DMA1_Stream6,DMA_IT_TC,ENABLE); //串口收DMA配置 //启动DMA时钟RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);//DMA通道配置DMA_DeInit(DMA1_Stream5);DMA_InitStructure.DMA_Channel = DMA_Channel_4;//外设地址DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&USART2->DR);//内存地址DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Rx_Buf_Gsm;//dma传输方向DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//设置DMA在传输时缓冲区的长度DMA_InitStructure.DMA_BufferSize = RX_LEN_GSM;//设置DMA的外设递增模式，一个外设DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//设置DMA的内存递增模式DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//外设数据字长DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;//内存数据字长DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;//设置DMA的传输模式DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//设置DMA的优先级别DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;//指定如果FIFO模式或直接模式将用于指定的流 ： 不使能FIFO模式 DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //指定了FIFO阈值水平DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; //指定的Burst转移配置内存传输 DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //指定的Burst转移配置外围转移 */ DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //配置DMA1的通道 DMA_Init(DMA1_Stream5, &DMA_InitStructure); //使能通道DMA_Cmd(DMA1_Stream5,ENABLE);//初始化串口参数 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_InitStructure.USART_BaudRate = DEFAULT_BAUD_GSM; //初始化串口 USART_Init(USART2,&USART_InitStructure); //中断配置USART_ITConfig(USART2,USART_IT_TC,DISABLE);USART_ITConfig(USART2,USART_IT_RXNE,DISABLE);USART_ITConfig(USART2,USART_IT_IDLE,ENABLE); //配置中断 //NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; //通道设置为串口中断 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //中断占先等级NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //中断响应优先级 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //打开中断 NVIC_Init(&NVIC_InitStructure); //采用DMA方式发送USART_DMACmd(USART2,USART_DMAReq_Tx,ENABLE);//采用DMA方式接收USART_DMACmd(USART2,USART_DMAReq_Rx,ENABLE);//中断配置USART_ITConfig(USART2,USART_IT_TC,DISABLE);USART_ITConfig(USART2,USART_IT_RXNE,DISABLE);USART_ITConfig(USART2,USART_IT_TXE,DISABLE);USART_ITConfig(USART2,USART_IT_IDLE,ENABLE); //启动串口 USART_Cmd(USART2, ENABLE); //设置IO口时钟 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2); GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2);//管脚模式:输出口GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //类型:推挽模式GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //上拉下拉设置GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //IO口速度GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//管脚指定GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;//初始化GPIO_Init(GPIOA, &GPIO_InitStructure);//管脚模式:输入口GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //上拉下拉设置GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //管脚指定GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//初始化GPIO_Init(GPIOA, &GPIO_InitStructure); }

发送数据：

/** 接口函数:向gsm模块发送数据*参数:data:发送数据存放地址* size:发送数据字节数/void drv_gsm_tx(uint8_t *data,uint16_t size){//等待空闲while (Flag_Tx_Gsm_Busy);Flag_Tx_Gsm_Busy = 1;//数据memcpy(Tx_Buf_Gsm,data,size);//设置传输数据长度DMA_SetCurrDataCounter(DMA1_Stream6,size);//打开DMA,开始发送DMA_Cmd(DMA1_Stream6,ENABLE);}

中断处理函数：

/** 接口函数:DMA发送中断处理函数/void drv_gsm_deal_irq_dma_tx(void){if(DMA_GetITStatus(DMA1_Stream6,DMA_IT_TCIF6) != RESET) {//清除标志位DMA_ClearFlag(DMA1_Stream6,DMA_FLAG_TCIF6);//关闭DMADMA_Cmd(DMA1_Stream6,DISABLE);//打开发送完成中断,发送最后两个字节USART_ITConfig(USART2,USART_IT_TC,ENABLE);}}/** 处理发送完成中断*返回:0:未产生,1:已经产生/uint8_t drv_gsm_deal_irq_tx_end(void){if(USART_GetITStatus(USART2, USART_IT_TC) != RESET){//关闭发送完成中断USART_ITConfig(USART2,USART_IT_TC,DISABLE);//发送完成Flag_Tx_Gsm_Busy = 0;return 1;} return 0;}/** 处理接收完成中断*参数:buf:接收的数据* len:接收的数据长度*返回:0:未产生,其他:已经产生,此值为接收的数据长度/uint8_t drv_gsm_deal_irq_rx_end(uint8_t *buf){ uint16_t len = 0;//接收完成中断if(USART_GetITStatus(USART2, USART_IT_IDLE) != RESET){USART2->SR;USART2->DR; //清USART_IT_IDLE标志//关闭DMADMA_Cmd(DMA1_Stream5,DISABLE);//清除标志位DMA_ClearFlag(DMA1_Stream5,DMA_FLAG_TCIF5);//获得接收帧帧长len = RX_LEN_GSM - DMA_GetCurrDataCounter(DMA1_Stream5);memcpy(buf,Rx_Buf_Gsm,len);//设置传输数据长度DMA_SetCurrDataCounter(DMA1_Stream5,RX_LEN_GSM);//打开DMADMA_Cmd(DMA1_Stream5,ENABLE);return len;} return 0;}

中断函数：

/** GSM模块:DMA发送中断处理函数/void DMA1_Stream6_IRQHandler(void){gsm_dma_tx_irq_handler();}/** GSM模块:串口中断处理函数/void USART2_IRQHandler(void) {gsm_irq_handler();}

注意：

接收完成中断中必须要清除标志位

//清除标志位DMA_ClearFlag(DMA1_Stream5,DMA_FLAG_TCIF5);

中断处理函数：

/** 接口函数:DMA发送中断处理函数/void gsm_dma_tx_irq_handler(void){inf_gsm_deal_irq_dma_tx();}/** 接口函数:串口中断处理函数*参数:data:接收数据存放地址*返回:接收数据长度/void gsm_irq_handler(void) { struct _Gsm_Rx rx;uint8_t i = 0;//发送完成中断处理inf_gsm_deal_irq_tx_end();//接收完成中断处理rx.len = inf_gsm_deal_irq_rx_end(rx.buf);if (rx.len != 0){//通知观察者for (i = 0;i < Len_Observer;i++){Observer[i](rx);}} }

接口函数定义：

/** 接口函数:DMA发送中断处理函数/void inf_gsm_deal_irq_dma_tx(void){drv_gsm_deal_irq_dma_tx();}/** 处理发送完成中断*返回:0:未产生,1:已经产生/uint8_t inf_gsm_deal_irq_tx_end(void){return drv_gsm_deal_irq_tx_end();}/** 处理接收完成中断*参数:buf:接收的数据* len:接收的数据长度*返回:0:未产生,其他:已经产生,此值为接收的数据长度/uint8_t inf_gsm_deal_irq_rx_end(uint8_t *buf){return drv_gsm_deal_irq_rx_end(buf);}