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關(guān)鍵代碼分析：usart.H#ifndef __USART_H#define __USART_H#include "stdio.h"#include "sys.h" #define DMA_Rec_Len 200      //定義一個(gè)長(zhǎng)度為200個(gè)字節(jié)的數(shù)據(jù)緩沖區(qū)。（建議定義的長(zhǎng)度比你可能接收到的最長(zhǎng)單幀數(shù)據(jù)長(zhǎng)度長(zhǎng)?。?/span>void uart_init(u32 bound);void MYDMA_Enable(DMA_Channel_TypeDef*DMA_CHx);#endifusart.C//初始化IO 串口1 //bound:波特率void uart_init(u32 bound){    //GPIO端口設(shè)置    GPIO_InitTypeDef GPIO_InitStructure;    USART_InitTypeDef USART_InitStructure;    NVIC_InitTypeDef NVIC_InitStructure;    DMA_InitTypeDef DMA_InitStructure;   RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //使能USART1，GPIOA時(shí)鐘   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能DMA傳輸   RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);//使能USART2時(shí)鐘   USART_DeInit(USART1);  //復(fù)位串口1   //USART1_TX   PA.9    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出    GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA9       //USART1_RX  A.10    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空輸入    GPIO_Init(GPIOA, &GPIO_InitStructure);  //初始化PA10    //Usart1 NVIC 配置    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//搶占優(yōu)先級(jí)3    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子優(yōu)先級(jí)3    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能    NVIC_Init(&NVIC_InitStructure); //根據(jù)指定的參數(shù)初始化VIC寄存器     //USART 初始化設(shè)置  USART_InitStructure.USART_BaudRate = bound;//一般設(shè)置為9600;  USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字長(zhǎng)為8位數(shù)據(jù)格式  USART_InitStructure.USART_StopBits = USART_StopBits_1;//一個(gè)停止位  USART_InitStructure.USART_Parity = USART_Parity_No;//無(wú)奇偶校驗(yàn)位  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//無(wú)硬件數(shù)據(jù)流控制  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收發(fā)模式    USART_Init(USART1, &USART_InitStructure); //初始化串口    USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);//開啟空閑中斷    USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE);   //使能串口1 DMA接收    USART_Cmd(USART1, ENABLE);                    //使能串口      //相應(yīng)的DMA配置  DMA_DeInit(DMA1_Channel5);   //將DMA的通道5寄存器重設(shè)為缺省值  串口1對(duì)應(yīng)的是DMA通道5  DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&USART1->DR;  //DMA外設(shè)ADC基地址  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)DMA_Rece_Buf;  //DMA內(nèi)存基地址  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;  //數(shù)據(jù)傳輸方向，從外設(shè)讀取發(fā)送到內(nèi)存  DMA_InitStructure.DMA_BufferSize = DMA_Rec_Len;  //DMA通道的DMA緩存的大小  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;  //外設(shè)地址寄存器不變  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;  //內(nèi)存地址寄存器遞增  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;  //數(shù)據(jù)寬度為8位  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //數(shù)據(jù)寬度為8位  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;  //工作在正常緩存模式  DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //DMA通道 x擁有中優(yōu)先級(jí)   DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;  //DMA通道x沒(méi)有設(shè)置為內(nèi)存到內(nèi)存?zhèn)鬏?/span>  DMA_Init(DMA1_Channel5, &DMA_InitStructure);  //根據(jù)DMA_InitStruct中指定的參數(shù)初始化DMA的通道    DMA_Cmd(DMA1_Channel5, ENABLE);  //正式驅(qū)動(dòng)DMA傳輸}//串口中斷函數(shù)void USART1_IRQHandler(void)                 //串口1中斷服務(wù)程序{     if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)  //接收中斷(接收到的數(shù)據(jù)必須是0x0d 0x0a結(jié)尾)      {          USART_ReceiveData(USART1);//讀取數(shù)據(jù) 注意：這句必須要，否則不能夠清除中斷標(biāo)志位。          Usart1_Rec_Cnt = DMA_Rec_Len-DMA_GetCurrDataCounter(DMA1_Channel5); //算出接本幀數(shù)據(jù)長(zhǎng)度            //***********幀數(shù)據(jù)處理函數(shù)************//          printf ("The lenght:%d\r\n",Usart1_Rec_Cnt);          printf ("The data:\r\n");          Usart1_Send(DMA_Rece_Buf,Usart1_Rec_Cnt);         printf ("\r\nOver! \r\n");        //*************************************//         USART_ClearITPendingBit(USART1, USART_IT_IDLE);         //清除中斷標(biāo)志         MYDMA_Enable(DMA1_Channel5);                   //恢復(fù)DMA指針，等待下一次的接收     } }