嵌入式Linux下串口編程一、配置內(nèi)核在嵌入式Linux下進(jìn)行串口編程之前，先在內(nèi)核中配置串口部分，如下：DeviceDrivers---> characterdevices---> Serialdrivers---> <*>SamssungS3C2440/S3C2442Serialportsupport二、應(yīng)用程序C文件：uart_init.c:打開設(shè)備、初始化串口(設(shè)置參數(shù))main.c:測試串口讀寫頭文件：uart_init.hMakfileuart_init.c#include<stdio.h>#include<stdlib.h>#include<string.h>#include<error.h>#include<unistd.h>#include<fcntl.h>#include<sys/types.h>#include<sys/stat.h>#include<termios.h>intopen_termios(char*dev){ intfd=-1; if(-1==(fd=open(dev,O_RDWR|O_NOCTTY|O_NONBLOCK))) { printf("opentermioserror!\n"); } returnfd;}intset_termios(intfd,longspeed,chardatabit,charstopbit,charoebit){ structtermiosnewtio; interr=-1; //清零結(jié)構(gòu)體 bzero(&newtio,sizeof(newtio)); //設(shè)置接收使能 newtio.c_cflag|=CLOCAL|CREAD; //設(shè)置數(shù)據(jù)位 switch(databit) { case7: newtio.c_cflag|=CS7; break; case8: newtio.c_cflag|=CS8; break; default: newtio.c_cflag|=CS8; break; } //設(shè)置停止位 switch(stopbit) { case1: newtio.c_cflag&=~CSTOPB; break; case2: newtio.c_cflag|=CSTOPB; break; default: newtio.c_cflag&=~CSTOPB; break; } //設(shè)置校驗位 switch(oebit) { case'O'://奇校驗 newtio.c_cflag|=PARENB; newtio.c_cflag|=(INPCK|ISTRIP); newtio.c_cflag|=PARODD; break; case'E'://偶數(shù) newtio.c_cflag|=PARENB; newtio.c_cflag|=(INPCK|ISTRIP); newtio.c_cflag&=~PARODD; break; case'N'://不校驗 newtio.c_cflag&=~PARODD; break; default: //不校驗 newtio.c_cflag&=~PARODD; break; } //設(shè)置波特率 switch(speed) { case2400: cfsetispeed(&newtio,B2400); cfsetospeed(&newtio,B2400); break; case4800: cfsetispeed(&newtio,B4800); cfsetospeed(&newtio,B4800); break; case9600: cfsetispeed(&newtio,B9600); cfsetospeed(&newtio,B9600); break; case57600: cfsetispeed(&newtio,B57600); cfsetospeed(&newtio,B57600); break; case115200: cfsetispeed(&newtio,B115200); cfsetospeed(&newtio,B115200); break; default: cfsetispeed(&newtio,B9600); cfsetospeed(&newtio,B9600); break; } //設(shè)置等待時間和最小接收字符數(shù) newtio.c_cc[VTIME]=0; newtio.c_cc[VMIN]=0; //處理未接收字符 tcflush(fd,TCIFLUSH); //激活配置 if((tcsetattr(fd,TCSANOW,&newtio))!=0) perror("comseterror!"); else err=0; perror("comsetdone!"); returnerr;}uart_init.h#ifndef__UART_INIT__#define__UART_INIT__externintopen_termios(char*dev);intset_termios(intfd,longspeed,chardatabit,charstopbit,charoebit);#endifmain.c#include<stdio.h>#include<stdlib.h>#include<error.h>#include<unistd.h>#include<sys/types.h>#include<sys/stat.h>#include<termios.h>#include"uart_init.h"char*uart0_dev="/dev/ttySAC0";intmain(void){ intuart0_fd; interr=0; charuart0_byte=0; char*uart0_buff[8]={0}; uart0_fd=open_termios(uart0_dev); if(uart0_fd<0) { exit(1); } do { err=set_termios(uart0_fd,115200,8,1,'N'); } while(-1==err); while(1) { read(uart0_fd,&uart0_byte,1); if(0xfd==uart0_byte) { read(uart0_fd,uart0_buff,8); write(uart0_fd,uart0_buff,8); memset(uart0_buff,0,sizeof(uart0_buff)); uart0_byte=0; } } exit(0);}Makefile#YoucanaddsourcecodefilelikethefollowingSOURCE+=main.cSOURCE+=uart_init.c##YoucanaddheadercodefilelikethefollowingHEADER+=uart_init.h#YoucannametheexecutablefilelikethefollowingTARGET=UART_ARM#YoucanaddincludepathlikethefollowingINCLUDEPATH=#YoucanlibrarypathlikethefollowingLIBPATH=#YoucanaddlibrarylikethefollowingLIBS=-lpthread#YoucantaddcompileoptionslikethefollowingOPTION+=-WallOPTION+=-g#YoucanspecifythecompilerCC=arm-linux-gcc#Don'tmodifythefollowingcodeunlessyouknowhowtoexactlyOBJECTS=$(SOURCE:%.c=%.o)$(TARGET):$(OBJECTS) $(CC)$(OPTIO