receive.c

串口初始化及 串口的接收和发送函数

#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"math.h"

#define  max_buffer_size	100

int fd,s;

int open_serial(int k)
{
  if(k==0)
  {
   fd=open("/dev/ttys0",O_RDWR|O_NOCTTY);
   perror("open /dev/ttys0");
  }
  else
  {
   fd=open("/dev/ttys1",O_RDWR|O_NOCTTY);
   perror("open /dev/ttys1");
  }
  if(fd==-1)
   return -1;
   else 
   return 0;
}
/*****************************************************************************/
int main()
{
  char hd[max_buffer_size],*rbuf;
  int flag_close,retv,i,ncount=0;
  struct termios opt;
  int realdata=0;
  open_serial(0);
  /****************************************************************************/
  tcgetattr(fd,&opt);
  cfmakeraw(&opt);
  /****************************************************************************/
  cfsetispeed(&opt,B9600);
  cfsetospeed(&opt,B9600);
  /****************************************************************************/
  tcsetattr(fd,TCSANOW,&opt);
  rbuf=hd;
  printf("ready for receiving data.....\n");
  retv=read(fd,rbuf,1);
  if(retv==-1)
  {
   perror("read");
  }
 /****************************************************************************/
 while(*rbuf!='\n')
  {
    ncount+=1;
    rbuf++;
    retv=read(fd,rbuf,1);
    if(retv==-1)
    {
      perror("read");
    }
  }
 /*******************************************************************************/
  printf("the data received is :\n");

  for(i=0;i<ncount;i++)
  {
     printf("%d",hd[i]);

  }
  printf("\n");
  flag_close=close(fd);
  if(flag_close==-1)
   printf("close the device failur! \n");
   return 0;

}