/************************************************ *  TTY SERIAL ROUTES  *  use ttyS1 to ctrol GPRS *  by Zou jian guo <ah_zou@163.com>    *  2004-11-02 *   *  edited by wbin <wbinbuaa@163.com> *  2005-01-19 *  *************************************************///#include <termios.h>//#include <stdio.h>//#include <unistd.h>//#include <fcntl.h>//#include <sys/signal.h>//#include <pthread.h>//#include "tty.h"#include <sys/types.h>                                                  #include <sys/stat.h>                                                      #include <fcntl.h>                                                       #include <termios.h>                                                    #include <stdio.h>    #define BAUDRATE B19200#define COM1 "/dev/ttyS0"#define COM2 "/dev/ttyS2"static int fd;static struct termios oldtio,newtio;//==============================================================int tty_end(){  	tcsetattr(fd,TCSANOW,&oldtio);	 	/* restore old modem setings *///  	tcsetattr(0,TCSANOW,&oldstdtio); 	/* restore old tty setings */  	close(fd);}//==============================================================/*static void do_exit(){	tty_end();	exit(1);}*///==============================================================int tty_read(char *buf,int nbytes){	return read(fd,buf,nbytes);}//==============================================================int tty_write(char *buf,int nbytes){	int i;	for(i=0; i<nbytes; i++) {		write(fd,&buf[i],1);		usleep(100);	}	return tcdrain(fd);}//==============================================================int tty_writecmd(char *buf,int nbytes){	int i;	for(i=0; i<nbytes; i++) {		write(fd,&buf[i],1);		usleep(100);	}	write(fd,"\r",1);	usleep(300000);	return tcdrain(fd);}//==============================================================/*int tty_writebyte(char *buf){	write(fd,&buf[0],1);	usleep(10);//	write(fd,buf,nbytes);	return tcdrain(fd);}*///==============================================================int tty_init(){	fd = open(COM2, O_RDWR ); //| O_NONBLOCK);//	if (fd <0) {	    	perror(COM2);	    	exit(-1);  	}	//  	tcgetattr(0,&oldstdtio);  	tcgetattr(fd,&oldtio); /* save current modem settings *///  	tcgetattr(fd,&newstdtio); /* get working stdtio */	bzero(&newtio, sizeof(newtio)); //	newtio.c_cflag = oldstdtio.c_cflag;//	newtio.c_iflag = oldstdtio.c_iflag;//	newtio.c_oflag = oldstdtio.c_oflag;// 	newtio.c_lflag = oldstdtio.c_lflag;	newtio.c_cflag = BAUDRATE | /*CRTSCTS |*/ CS8 /*| CLOCAL | CREAD */;	newtio.c_iflag = IGNPAR | ICRNL; 	newtio.c_oflag = 0; 	newtio.c_lflag = ICANON;	 newtio.c_cc[VINTR]    = 0;     /* Ctrl-c */  	 newtio.c_cc[VQUIT]    = 0;     /* Ctrl-\ */ 	 newtio.c_cc[VERASE]   = 0;     /* del */ 	 newtio.c_cc[VKILL]    = 0;     /* @ */ 	 newtio.c_cc[VEOF]     = 4;     /* Ctrl-d */ 	 newtio.c_cc[VTIME]    = 0;     /* 不使用分割字元組的計(jì)時(shí)器 */ 	 newtio.c_cc[VMIN]     = 1;     /* 在讀取到 1 個(gè)字元前先停止 */ 	 newtio.c_cc[VSWTC]    = 0;     /* '\0' */ 	 newtio.c_cc[VSTART]   = 0;     /* Ctrl-q */  	 newtio.c_cc[VSTOP]    = 0;     /* Ctrl-s */ 	 newtio.c_cc[VSUSP]    = 0;     /* Ctrl-z */ 	 newtio.c_cc[VEOL]     = 0;     /* '\0' */ 	 newtio.c_cc[VREPRINT] = 0;     /* Ctrl-r */ 	 newtio.c_cc[VDISCARD] = 0;     /* Ctrl-u */ 	 newtio.c_cc[VWERASE]  = 0;     /* Ctrl-w */ 	 newtio.c_cc[VLNEXT]   = 0;     /* Ctrl-v */ 	 newtio.c_cc[VEOL2]    = 0;     /* '\0' */ //	newtio.c_lflag  &= ~(ICANON | ECHO | ECHOE | ISIG);  /*Input*///	newtio.c_oflag  &= ~OPOST;   /*Output*/ 	tcflush(fd, TCIFLUSH);	tcsetattr(fd,TCSANOW,&newtio);/*set attrib	  */#if 0		newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD;/*ctrol flag*/	newtio.c_iflag = IGNPAR; /*input flag*/	newtio.c_oflag = 0;		/*output flag*/ 	newtio.c_lflag = 0; 	newtio.c_cc[VMIN]=1;	newtio.c_cc[VTIME]=0;//#else		newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD;/*ctrol flag*///	newtio.c_iflag = IGNPAR; /*input flag*/	newtio.c_iflag &= ~(ICRNL|IGNCR | INLCR |IGNBRK |BRKINT ); //input flag	newtio.c_oflag &= ~OPOST;		/*output flag*/ 	newtio.c_lflag = ECHO |NOFLSH; 	newtio.c_cc[VMIN]=1;	newtio.c_cc[VTIME]=0;#endif/* now clean the modem line and activate the settings for modem */// 	tcflush(fd, TCIFLUSH);//	tcsetattr(fd,TCSANOW,&newtio);/*set attrib	  *///	signal(SIGTERM,do_exit);//	signal(SIGQUIT,do_exit);//	signal(SIGINT,do_exit);	return 0;}