send.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 flag_close;

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(int argc ,char *argv[])
{
  char sbuf[]={"hello,this is a serial_port test !\n"};
  int sfd,retv,i;
  struct termios option;
  int length=sizeof(sbuf);
/*******************************************************************************/
  open_serial(0);
  /****************************************************************************/
  printf("ready for sending data.....\n");
  tcgetattr(fd,&option);
  cfmakeraw(&option);
  /****************************************************************************/
  cfsetispeed(&option,B9600);
  cfsetospeed(&option,B9600);
  /****************************************************************************/
  tcsetattr(fd,TCSANOW,&option);
//  rbuf=hd;
 // printf("ready for receiving data.....\n");
  retv=write(fd,sbuf,length);
  if(retv==-1)
  {
   perror("write");
  }
  printf("the number of char sent is %d\n",retv);
 /****************************************************************************/
/* 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;
}