serialserver.c

Linux串口通信客户端和服务器程序

/*serial server on linux pc */
#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include <errno.h>
#include <math.h>
int spfd;
int main()
{
 char hd[16],*rbuf;
 int retv,i,ncount=0;
 struct termios oldtio;
 int realdata = 0;
 spfd = open("/dev/ttyS1",O_RDWR|O_NOCTTY);
 if(spfd<0)
	{
	 perror("open/dev/ttyS1");
	 return -1;
	}
 tcgetattr(spfd,&oldtio); //保存串口的当前设置
 cfmakeraw(&oldtio);
 cfsetispeed(&oldtio,B115200);
 cfsetospeed(&oldtio,B115200);
 tcsetattr(spfd,TCSANOW,&oldtio); //选择新的设置,TCSANOW表示设置立即生效
 rbuf = hd;
 printf("ready for receiving data ....\n");
 retv= read(spfd,rbuf,1);
  if(retv==-1)
	{
	 perror("read");
	 return -1;
	}
 while( *rbuf!='\0')
  {
  ncount +=1;
  rbuf++;
  retv = read(spfd,rbuf,1);
  printf("the number received is %d\n",retv);
  if (retv== -1)
  perror("read");
  }
 for(i=0;i<ncount;i++)
  {
   realdata += (hd[i]-48)*pow(10,ncount-i-1);

  }
 printf("complete receiving the data %d\n",realdata);
 close(spfd);
 return 0;
}