STM32F407的串口采用DMA收發(fā)數據

主機:WIN8

開(kāi)發(fā)環(huán)境:MDK5.13

mcu: stm32f407VGT6

說(shuō)明:

之前用STM32F103實(shí)現DMA收發(fā)串口數據，現在項目中采用STM32F407，所以將此機制移植到F4上。

STM32F103上用DMA收發(fā)串口數據文章：

STM32的串口采用DMA方式發(fā)送數據測試

STM32的串口采用DMA方式接收數據測試

源代碼：

串口初始化代碼：

/**							初始化串口/static void init_uart(void){//定義中斷結構體NVIC_InitTypeDef NVIC_InitStructure ;//定義IO初始化結構體GPIO_InitTypeDef GPIO_InitStructure;//定義串口結構體  USART_InitTypeDef USART_InitStructure;//定義DMA結構體DMA_InitTypeDef DMA_InitStructure;//打開(kāi)串口對應的外設時(shí)鐘  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);//串口發(fā)DMA配置  //啟動(dòng)DMA時(shí)鐘RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);//DMA發(fā)送中斷設置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; //外設地址DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&USART2->DR);//內存地址DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Tx_Buf_Gsm;//dma傳輸方向DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;//設置DMA在傳輸時(shí)緩沖區的長(cháng)度DMA_InitStructure.DMA_BufferSize = TX_LEN_GSM;//設置DMA的外設遞增模式，一個(gè)外設DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//設置DMA的內存遞增模式DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//外設數據字長(cháng)DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;//內存數據字長(cháng)DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte;//設置DMA的傳輸模式DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//設置DMA的優(yōu)先級別DMA_InitStructure.DMA_Priority = DMA_Priority_High;//指定如果FIFO模式或直接模式將用于指定的流 ： 不使能FIFO模式  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;    //指定了FIFO閾值水平DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;        //指定的Burst轉移配置內存傳輸 DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;       //指定的Burst轉移配置外圍轉移 */  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //配置DMA1的通道         DMA_Init(DMA1_Stream6, &DMA_InitStructure);  //使能中斷DMA_ITConfig(DMA1_Stream6,DMA_IT_TC,ENABLE);   //串口收DMA配置  //啟動(dòng)DMA時(shí)鐘RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);//DMA通道配置DMA_DeInit(DMA1_Stream5);DMA_InitStructure.DMA_Channel = DMA_Channel_4;//外設地址DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&USART2->DR);//內存地址DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Rx_Buf_Gsm;//dma傳輸方向DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//設置DMA在傳輸時(shí)緩沖區的長(cháng)度DMA_InitStructure.DMA_BufferSize = RX_LEN_GSM;//設置DMA的外設遞增模式，一個(gè)外設DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//設置DMA的內存遞增模式DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//外設數據字長(cháng)DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;//內存數據字長(cháng)DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;//設置DMA的傳輸模式DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//設置DMA的優(yōu)先級別DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;//指定如果FIFO模式或直接模式將用于指定的流 ： 不使能FIFO模式  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;    //指定了FIFO閾值水平DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;        //指定的Burst轉移配置內存傳輸 DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;       //指定的Burst轉移配置外圍轉移 */  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);//初始化串口參數  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);  //中斷配置USART_ITConfig(USART2,USART_IT_TC,DISABLE);USART_ITConfig(USART2,USART_IT_RXNE,DISABLE);USART_ITConfig(USART2,USART_IT_IDLE,ENABLE);  //配置中斷  //NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;               //通道設置為串口中斷  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;       //中斷占先等級NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;              //中斷響應優(yōu)先級 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                 //打開(kāi)中斷  NVIC_Init(&NVIC_InitStructure);   //采用DMA方式發(fā)送USART_DMACmd(USART2,USART_DMAReq_Tx,ENABLE);//采用DMA方式接收USART_DMACmd(USART2,USART_DMAReq_Rx,ENABLE);//中斷配置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);  //啟動(dòng)串口  USART_Cmd(USART2, ENABLE);    //設置IO口時(shí)鐘      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_USART2);  GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_USART2);//管腳模式:輸出口GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;	//類(lèi)型:推挽模式GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;	//上拉下拉設置GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;	//IO口速度GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//管腳指定GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;//初始化GPIO_Init(GPIOA, &GPIO_InitStructure);//管腳模式:輸入口GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;	//上拉下拉設置GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;	//管腳指定GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//初始化GPIO_Init(GPIOA, &GPIO_InitStructure);      }

發(fā)送數據：

/**							接口函數:向gsm模塊發(fā)送數據*參數:data:發(fā)送數據存放地址*	  size:發(fā)送數據字節數/void drv_gsm_tx(uint8_t *data,uint16_t size){//等待空閑while (Flag_Tx_Gsm_Busy);Flag_Tx_Gsm_Busy = 1;//數據memcpy(Tx_Buf_Gsm,data,size);//設置傳輸數據長(cháng)度DMA_SetCurrDataCounter(DMA1_Stream6,size);//打開(kāi)DMA,開(kāi)始發(fā)送DMA_Cmd(DMA1_Stream6,ENABLE);}

中斷處理函數：

/**							接口函數:DMA發(fā)送中斷處理函數/void drv_gsm_deal_irq_dma_tx(void){if(DMA_GetITStatus(DMA1_Stream6,DMA_IT_TCIF6) != RESET) {//清除標志位DMA_ClearFlag(DMA1_Stream6,DMA_FLAG_TCIF6);//關(guān)閉DMADMA_Cmd(DMA1_Stream6,DISABLE);//打開(kāi)發(fā)送完成中斷,發(fā)送最后兩個(gè)字節USART_ITConfig(USART2,USART_IT_TC,ENABLE);}}/**							處理發(fā)送完成中斷*返回:0:未產(chǎn)生,1:已經(jīng)產(chǎn)生/uint8_t drv_gsm_deal_irq_tx_end(void){if(USART_GetITStatus(USART2, USART_IT_TC) != RESET){//關(guān)閉發(fā)送完成中斷USART_ITConfig(USART2,USART_IT_TC,DISABLE);//發(fā)送完成Flag_Tx_Gsm_Busy = 0;return 1;} return 0;}/**							處理接收完成中斷*參數:buf:接收的數據*     len:接收的數據長(cháng)度*返回:0:未產(chǎn)生,其他:已經(jīng)產(chǎn)生,此值為接收的數據長(cháng)度/uint8_t drv_gsm_deal_irq_rx_end(uint8_t *buf){	uint16_t len = 0;//接收完成中斷if(USART_GetITStatus(USART2, USART_IT_IDLE) != RESET){USART2->SR;USART2->DR; //清USART_IT_IDLE標志//關(guān)閉DMADMA_Cmd(DMA1_Stream5,DISABLE);//清除標志位DMA_ClearFlag(DMA1_Stream5,DMA_FLAG_TCIF5);//獲得接收幀幀長(cháng)len = RX_LEN_GSM - DMA_GetCurrDataCounter(DMA1_Stream5);memcpy(buf,Rx_Buf_Gsm,len);//設置傳輸數據長(cháng)度DMA_SetCurrDataCounter(DMA1_Stream5,RX_LEN_GSM);//打開(kāi)DMADMA_Cmd(DMA1_Stream5,ENABLE);return len;} return 0;}

中斷函數：

/**							GSM模塊:DMA發(fā)送中斷處理函數/void DMA1_Stream6_IRQHandler(void){gsm_dma_tx_irq_handler();}/**							GSM模塊:串口中斷處理函數/void USART2_IRQHandler(void) {gsm_irq_handler();}

注意：

接收完成中斷中必須要清除標志位

//清除標志位DMA_ClearFlag(DMA1_Stream5,DMA_FLAG_TCIF5);

中斷處理函數：

/**							接口函數:DMA發(fā)送中斷處理函數/void gsm_dma_tx_irq_handler(void){inf_gsm_deal_irq_dma_tx();}/**							接口函數:串口中斷處理函數*參數:data:接收數據存放地址*返回:接收數據長(cháng)度/void gsm_irq_handler(void)                              {   struct _Gsm_Rx rx;uint8_t i = 0;//發(fā)送完成中斷處理inf_gsm_deal_irq_tx_end();//接收完成中斷處理rx.len = inf_gsm_deal_irq_rx_end(rx.buf);if (rx.len != 0){//通知觀(guān)察者for (i = 0;i < Len_Observer;i++){Observer[i](rx);}} } 

接口函數定義：

/**							接口函數:DMA發(fā)送中斷處理函數/void inf_gsm_deal_irq_dma_tx(void){drv_gsm_deal_irq_dma_tx();}/**							處理發(fā)送完成中斷*返回:0:未產(chǎn)生,1:已經(jīng)產(chǎn)生/uint8_t inf_gsm_deal_irq_tx_end(void){return drv_gsm_deal_irq_tx_end();}/**							處理接收完成中斷*參數:buf:接收的數據*     len:接收的數據長(cháng)度*返回:0:未產(chǎn)生,其他:已經(jīng)產(chǎn)生,此值為接收的數據長(cháng)度/uint8_t inf_gsm_deal_irq_rx_end(uint8_t *buf){return drv_gsm_deal_irq_rx_end(buf);}