serialclient.c

Linux串口通信客户端和服务器程序

/*serial client on uclinux terminal */
#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 <stdlib.h>
#include <unistd.h>
int spfd;
int main()
{
 char fname[16],*sbuf;
 int retv;
 struct termios oldtio;

 spfd = open("/dev/ttyS0",O_RDWR|O_NOCTTY);
 if(spfd<0)
	{
	 perror("open/dev/ttyS0");
	 return -1;
	}
 printf("\n ready for sending data....\n");


 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

 fname[0] = '1';
 fname[1] = '2';
 fname[2] = '3';
 fname[3] = '\0';
 
 sbuf = (char *)malloc(4);
 strncpy(sbuf,fname,4);
 retv= write(spfd,sbuf,4);
  if(retv==-1)
   perror("read");

  printf("the number of char sent is %d\n",retv);
  return 0;
}