C语言实现两台电脑通过串口通信

用C语言实现在发送端控制台输入字符串并在接收端接收显示的功能。

/*********************server.c****************/
#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<termios.h>
#define BAUDRATE B38400
#define MODEMDEVICE "/dev/ttyS0"
#define STOP '@'
int main(){
   int fd,c=0,res;
   struct termios oldtio,newtio;
   char ch,s1[20];
   printf("start...\n");
   fd=open(MODEMDEVICE,O_RDWR | O_NOCTTY);
   if(fd<0)
   {
      perror(MODEMDEVICE);
      exit(1);
   }
   printf("open...\n");
   tcgetattr(fd,&oldtio);
   bzero(&newtio,sizeof(newtio));
   newtio.c_cflag=BAUDRATE|CS8|CLOCAL|CREAD;
   newtio.c_iflag=IGNPAR;
   newtio.c_oflag=0;
   newtio.c_lflag=ICANON;
   tcflush(fd,TCIFLUSH);
   tcsetattr(fd,TCSANOW,&newtio);
   printf("writing...\n");
   while(1)
   {
      while((ch=getchar())!='@')
        {
           s1[0]=ch;
           res=write(fd,s1,1);
        }
        s1[0]=ch;
        s1[1]='\n';
        res=write(fd,s1,2);
        break;
   }
   printf("close...\n");
   close(fd);
   tcsetattr(fd,TCSANOW,&oldtio);
   return 0;
}

/**************client.c***************/
#include<stdio.h>
#include<sys/types.h>
#include<fcntl.h>
#include<termios.h>
#define BAUDRATE B38400
#define MODEMDEVICE "/dev/ttyS0"
int main()
{
    int fd,c=0,res;
    struct termios oldtio,newtio;
    char buf[256];
    printf("start ...\n");
    fd=open(MODEMDEVICE,O_RDWR | O_NOCTTY);
    if(fd<0)
    {
      perror(MODEMDEVICE);
      exit(1);
    }
    printf("open...\n");
    tcgetattr(fd,&oldtio);
    bzero(&newtio,sizeof(newtio));
    newtio.c_cflag=BAUDRATE | CS8 | CLOCAL | CREAD;
    newtio.c_iflag=IGNPAR;
    newtio.c_oflag=0;
    newtio.c_lflag=ICANON;
    tcflush(fd,TCIFLUSH);
    tcsetattr(fd,TCSANOW,&newtio);
    printf("reading...\n");
    while(1)
    {
       res=read(fd,buf,255);
       buf[res]=0;
       printf("res=%d vuf=%s\n",res,buf);
       if(buf[0]=='a') break;
    }
       printf("close...\n");
       close(fd);
       tcsetattr(fd,TCSANOW,&oldtio);
       return 0;
}

发送端截图：

接受端截图：


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