STM32的串口采用DMA方式發(fā)送數據測試

主機:WIN7

開(kāi)發(fā)環(huán)境:MDK4.23

MCU:STM32F103CBT6

源代碼:

配置:

//---------------------串口功能配置---------------------//打開(kāi)串口對應的外設時(shí)鐘  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 , ENABLE);   //啟動(dòng)DMA時(shí)鐘RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);//DMA發(fā)送中斷設置NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);//DMA1通道4配置DMA_DeInit(DMA1_Channel4);//外設地址DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&USART1->DR);//內存地址DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Uart_Send_Buffer;//dma傳輸方向單向DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;//設置DMA在傳輸時(shí)緩沖區的長(cháng)度DMA_InitStructure.DMA_BufferSize = 100;//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;//設置DMA的2個(gè)memory中的變量互相訪(fǎng)問(wèn)DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;DMA_Init(DMA1_Channel4,&DMA_InitStructure);DMA_ITConfig(DMA1_Channel4,DMA_IT_TC,ENABLE);//使能通道4//DMA_Cmd(DMA1_Channel4, ENABLE);//初始化參數  //USART_InitStructure.USART_BaudRate = DEFAULT_BAUD;  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; //初始化串口 USART_Init(USART1,&USART_InitStructure);  //TXE發(fā)送中斷,TC傳輸完成中斷,RXNE接收中斷,PE奇偶錯誤中斷,可以是多個(gè)   USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);  //配置UART1中斷  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;               //通道設置為串口1中斷  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;       //中斷占先等級0  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;              //中斷響應優(yōu)先級0  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                 //打開(kāi)中斷  NVIC_Init(&NVIC_InitStructure);                                 //初始化  //采用DMA方式發(fā)送USART_DMACmd(USART1,USART_DMAReq_Tx,ENABLE);//啟動(dòng)串口  USART_Cmd(USART1, ENABLE);   //設置IO口時(shí)鐘      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);    //串口1的管腳初始化    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;                       //管腳9  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;                //選擇GPIO響應速度  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;                 //復用推挽輸出  GPIO_Init(GPIOA, &GPIO_InitStructure);                          //TX初始化  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;                      //管腳10  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;                //選擇GPIO響應速度  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;           //浮空輸入  GPIO_Init(GPIOA, &GPIO_InitStructure);                          //RX初始化                                                      //設置IO口時(shí)鐘      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;                       //管腳9  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;                //選擇GPIO響應速度  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;                 //復用推挽輸出  

//串口1DMA方式發(fā)送中斷void DMA1_Channel4_IRQHandler(void){//清除標志位DMA_ClearFlag(DMA1_FLAG_TC4);//DMA_ClearITPendingBit(DMA1_FLAG_TC4);//DMA1->IFCR |= DMA1_FLAG_TC4;//關(guān)閉DMADMA_Cmd(DMA1_Channel4,DISABLE);//DMA1_Channel4->CCR &= ~(1<<0);//允許再次發(fā)送Flag_Uart_Send = 0;}

//串口DMA發(fā)送測試Uart_Send_Buffer[0] = 1;Uart_Send_Buffer[1] = 2;Uart_Send_Buffer[2] = 3;Uart_Send_Buffer[3] = 4;Uart_Send_Buffer[4] = 5;i = 1;while (1){//檢查串口是否可以發(fā)送while (Flag_Uart_Send);Flag_Uart_Send = 1;//設置傳輸數據長(cháng)度DMA_SetCurrDataCounter(DMA1_Channel4,i);//打開(kāi)DMADMA_Cmd(DMA1_Channel4,ENABLE);i++;if (i > 5){i = 1;}}