Linux串口通信例子

#include <time.h>

002#include <fcntl.h>

003#include <stdio.h>

004#include <ctype.h>

005#include <errno.h>

006#include <stdlib.h>

007#include <string.h>

008#include <unistd.h>

009#include <signal.h>

010#include <termio.h>

011#include <syslog.h>

012#include <pthread.h>

013#include <sys/ipc.h>

014#include <sys/msg.h>

015#include <sys/wait.h>

016#include <sys/stat.h>

017#include <sys/time.h>

018#include <semaphore.h>

019#include <arpa/inet.h>

020#include <sys/types.h>

021#include <sys/socket.h>

022#include <bits/signum.h>

023#include <sys/resource.h>

024  

025int uart_init(int arg, int baud)

026{

027    intfd;

028    charport[20];

029    structtermios Opt;

030    intuartbiit[50]= {B115200,B9600,B19200,B4800,B2400,B1200};

031  

032    sprintf(port,"/dev/s3c2410_serial%d",arg);   

033    printf("Use port: %s \n", port);

034    fd = open(port, O_RDWR);    //打开串口

035    if(fd<0)

036    {

037        return-1;                 //没有打开返回

038    }

039  

040    tcgetattr(fd,&Opt);     //初始化

041    tcflush(fd,TCIFLUSH);

042    cfsetispeed(&Opt,uartbiit[baud]);   //设置波特率

043    cfsetospeed(&Opt,uartbiit[baud]);

044  

045    Opt.c_cflag |= CS8;                         //设置数据位

046    Opt.c_cflag &= ~PARENB;

047    Opt.c_oflag &= ~(OPOST);

048    Opt.c_cflag &= ~CSTOPB;

049    Opt.c_lflag &= ~(ICANON|ISIG|ECHO|IEXTEN);

050    Opt.c_iflag &= ~(INPCK|BRKINT|ICRNL|ISTRIP|IXON);

051  

052    Opt.c_cc[VMIN] = 64;           //最大长度

053    Opt.c_cc[VTIME] = 1;           //超时时间

054  

055    if(tcsetattr(fd,TCSANOW,&Opt) != 0)       //装载初始化参数

056    {

057        perror("SetupSerial!\n");

058        close(fd);

059        return-1;

060    }

061    return(fd);

062  

063}

064  

065int main()

066{

067    intfd, len = 0, i=0;

068    charbuf[300];

069  

070    if((fd = uart_init(1, 0)) <0)  //打开串口，波特率为115200；

071    {

072        printf("Open uart err \n");

073        return-1;

074    }

075    sprintf(buf,"Hello world !\n");  //输出内容

076   

077  while(1)

078          {

079    memset(buf, 0 ,sizeof(buf));

080      

081#if 0

082                   while((len = read(fd,buf,64))>0)

083                   {

084                        printf("%s\n",buf);

085                    }

086#endif

087  

088  

089#if 1

090    intnread;

091    while((nread = read(fd, buf, 300))>0)

092    {

093//      printf("read len %d\t",nread);

094//      buf[nread] = '\0';

095        printf("%s\n",buf);

096        write(fd,buf,sizeof(buf));

097      

098    }

099#endif

100          }

101   

102   

103    return0;

104}