#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <termio.h>

int tty_mode(int how)
{
static struct termios original_mode;
if(how==0)
tcgetattr(0,&original_mode);
else return tcsetattr(0,TCSANOW,&original_mode);
}
void set_crmode()
{
struct termios ttystate;
tcgetattr(0,&ttystate);
ttystate.c_lflag &= ~ICANON;
ttystate.c_lflag &=~ECHO;
ttystate.c_cc[VMIN]=1;
tcsetattr(0,TCSANOW,&ttystate);
}

int signal_io(int sig)
{
static char buf[128],ch=0;
static int len=0;
//memset(buf,0,sizeof(buf));
//printf("aaaa\n");
if(read(0,&ch,1)==1)
{
if(ch!=127)
{
printf("%c",ch);
buf[len++]=ch;
}
else {
        if(len>0)
        buf[--len]=0;
        printf("\b \b");
        }
}
//perror(NULL);
//printf("%d\n",ch);
fflush(stdout);
}
int main()
{
int flag=0;
tty_mode(0);
set_crmode();
signal(SIGIO,signal_io);
fcntl(0,F_SETOWN,getpid());
flag=fcntl(0,F_GETFL);
fcntl(0,F_SETFL,flag|O_ASYNC);
while(1)
pause();
tty_mode(1);
}

/******************************************************
*file name:recerve.c
*Description:Recerve data from Serial_Port
*Date:
*******************************************************/
/********************头文件定义************************/
#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include 'math.h'
#define max_buffer_size 100      /*定义缓冲区最大宽度*/
/******************************************************/

int fd,s;
int open_serial(int k)
/***********************************************
*open serial function.
*input k k=0open serial1,k=1,openserial2
*return -1 false, return 0 success
**********************************************/
{
  if (k=0)
  {
    int 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)/*打开失败*/
    return -1;
  else
    return 0;

}

/**************************************************************/


int main()
{
char hd[max_buffer_size],*rbuf; /*定义接收缓冲区*/
int flag_close, retv,i,ncount=0;
struct termios opt;
int realdata=0;

/*******************************************************************/
open_serial(0); /*打开串口1*/
/*******************************************************************/

tcgetattr(fd,&opt);
cfmakeraw(&opt);

/*****************************************************************/
cfsetispeed(&opt,B9600); /*波特率设置为9600bps*/
cfsetospeed(&opt,B9600);
/*******************************************************************/

tcsetattr(fd,TCSANOW,&opt);
rbuf=hd; /*数据保存*/
printf("ready for receiving data...\n");
retv=read(fd,rbuf,1); /*接收数据*/
if(retv==-1)
{
  perror("read"); /*读状态标志判断*/
}
/*************************开始接收数据******************************/

while(*rbuf!='\n') /*判断数据是否接收完毕*/
    {
ncount+=1;
rbuf++;
retv=read(fd,rbuf,1);
if(retv==-1)
{
perror("read");
}
}
/*******************************************************************/
printf("The data received is:\n"); /*输出接收到的数据*/
for(i=0;i <ncount;i++)
{
printf("%c",hd[i]);
}
printf("\n");
flag_close =close(fd);
if(flag_close ＝＝－1) /*判断是否成功关闭文件*/
printf("Close the Device failur！\n");
return 0;
}