#include     <stdio.h>      /*標準輸入輸出定義*/#include     <stdlib.h>     /*標準函數庫定義*/#include     <unistd.h>     /*Unix標準函數定義*/#include     <sys/types.h>  /**/#include     <sys/stat.h>   /**/#include     <fcntl.h>      /*文件控制定義*/#include     <termios.h>    /*PPSIX終端控制定義*/#include     <errno.h>      /*錯誤號定義*/#define FALSE -1#define TRUE 0/***@brief  設置串口通信速率*@param  fd     類型 int  打開串口的文件句柄*@param  speed  類型 int  串口速度*@return  void*/int speed_arr[] = { B38400, B19200, B9600, B4800, B2400, B1200, B300,	    B38400, B19200, B9600, B4800, B2400, B1200, B300, };int name_arr[] = {38400,  19200,  9600,  4800,  2400,  1200,  300,	    38400,  19200,  9600, 4800, 2400, 1200,  300, };void set_speed(int fd, int speed){  int   i;  int   status;  struct termios   Opt;  tcgetattr(fd, &Opt);  for ( i= 0;  i < sizeof(speed_arr) / sizeof(int);  i++)   {   	if  (speed == name_arr[i])   	{   	    tcflush(fd, TCIOFLUSH);    	cfsetispeed(&Opt, speed_arr[i]);    	cfsetospeed(&Opt, speed_arr[i]);    	status = tcsetattr(fd, TCSANOW, &Opt);    	if  (status != 0)            perror("tcsetattr fd1");     	return;     	}   tcflush(fd,TCIOFLUSH);   }}/***@brief   設置串口數據位，停止位和效驗位*@param  fd     類型  int  打開的串口文件句柄**@param  databits 類型  int 數據位   取值 為 7 或者8**@param  stopbits 類型  int 停止位   取值為 1 或者2**@param  parity  類型  int  效驗類型 取值為N,E,O,,S*/int set_Parity(int fd,int databits,int stopbits,int parity){	struct termios options; if  ( tcgetattr( fd,&options)  !=  0)  {  	perror("SetupSerial 1");  	return(FALSE);  }  options.c_cflag &= ~CSIZE;  switch (databits) /*設置數據位數*/  {  	case 7:  		options.c_cflag |= CS7;  		break;  	case 8:		options.c_cflag |= CS8;		break;	default:		fprintf(stderr,"Unsupported data size\n");		return (FALSE);	}  switch (parity)  	{  	case 'n':	case 'N':		options.c_cflag &= ~PARENB;   /* Clear parity enable */		options.c_iflag &= ~INPCK;     /* Enable parity checking */		break;	case 'o':	case 'O':		options.c_cflag |= (PARODD | PARENB);  /* 設置為奇效驗*/ 		options.c_iflag |= INPCK;             /* Disnable parity checking */		break;	case 'e':	case 'E':		options.c_cflag |= PARENB;     /* Enable parity */		options.c_cflag &= ~PARODD;   /* 轉換為偶效驗*/  		options.c_iflag |= INPCK;       /* Disnable parity checking */		break;	case 'S':	case 's':  /*as no parity*/		options.c_cflag &= ~PARENB;		options.c_cflag &= ~CSTOPB;		break;	default:		fprintf(stderr,"Unsupported parity\n");		return (FALSE);		}  /* 設置停止位*/     switch (stopbits)  	{  	case 1:  		options.c_cflag &= ~CSTOPB;		break;	case 2:		options.c_cflag |= CSTOPB;		break;	default:		fprintf(stderr,"Unsupported stop bits\n");		return (FALSE);	}  /* Set input parity option */  if (parity != 'n')  		options.c_iflag |= INPCK;    options.c_cc[VTIME] = 150; // 15 seconds    options.c_cc[VMIN] = 0;  tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */  if (tcsetattr(fd,TCSANOW,&options) != 0)  	{  		perror("SetupSerial 3");		return (FALSE);	}  return (TRUE); }/***@breif 打開串口*/int OpenDev(char *Dev){int	fd = open( Dev, O_RDWR );         //| O_NOCTTY | O_NDELAY	if (-1 == fd)		{ /*設置數據位數*/			perror("Can't Open Serial Port");			return -1;		}	else	return fd;}/***@breif 	main()*/int main(int argc, char **argv){	int fd;	int nread;	char buff[512];	char data[256];	char sure,ch;	char *dev ="/dev/tts/1";	fd = OpenDev(dev);	if (fd>0)       set_speed(fd,9600);	else		{		printf("Can't Open Serial Port!\n");		exit(0);		}  if (set_Parity(fd,8,1,'n')== FALSE)  {    printf("Set Parity Error\n");    exit(1);  }  while(1)  	{	int iread,count,times;		iread=0;		count=0;		times=0;		sure='\n';                memset(buff,'\0',50);	        memset(data,'\0',50);			printf("please enter y or n?\n");			scanf("%c",&sure);		scanf("%c",&ch);		if(sure=='y'){	      while((nread = read(fd,buff,100))>0)   		{                 printf("%s\n",buff);		count=0;		strcat(data,buff);		if(buff[7]=='\0')		{	        memset(buff,'\0',50);		break ;		}   	 	}			if(data[0]!='\0')		//printf("%s\n",buff);		printf("%s\n",data);			fflush(stdin);		}}    close(fd);    exit(0);}