tryttys1.c

这是一个MINITGUI2。0的应用程序

#include     <stdio.h>      /*标准输入输出定义*/
#include     <stdlib.h>     /*标准函数库定义*/
#include     <unistd.h>     /*Unix 标准函数定义*/
#include     <sys/types.h>  
#include     <sys/stat.h>   
#include     <fcntl.h>      /*文件控制定义*/
#include     <termios.h>    /*PPSIX 终端控制定义*/
#include     <errno.h>      /*错误号定义*/
#include     <fcntl.h>
#include     <sys/signal.h>
#define FALSE 0
#define TRUE 1
extern int readttyS1(int fd,char *buf);
extern int initttyS1(void);
//void signal_handler_IO (int status);   /* definition of signal handler */
int wait_flag=TRUE;                    /* TRUE while no signal received */
volatile int STOP=FALSE;  
int initttyS1(void){
	static int fd;
	struct  termios Opt;
	//fd = open( "/dev/ttyS1", O_RDWR|O_NONBLOCK|O_NOCTTY);
	fd = open( "/dev/tts/1", O_RDWR|O_NONBLOCK|O_NOCTTY);
	if (-1 == fd){ 
	/* 不能打开串口一*/ 
		printf("can't open /dev/ttys1\n");
		exit(0);
	}
	/*------------------------------------*/
	//串口参数设置,波特率19200,8n1
	tcgetattr(fd, &Opt);

	cfsetispeed(&Opt,B9600);     /*设置为19200Bps*/
	cfsetospeed(&Opt,B9600);
	tcsetattr(fd,TCSANOW,&Opt);
	printf("btl is 9600\n");
       
	Opt.c_lflag &= ~(ICANON|ECHO|ECHOE|ISIG);
	Opt.c_oflag &= ~OPOST;
	tcsetattr(fd,TCSANOW,&Opt);
	printf("8n1\n");
	/*-------------------------------------*/
	
	return fd;
}       
int readttyS1(int fd,char *buf){
	//static int i;   /*以读写方式打开串口*/
	
	//fd_set rds;
	//int ret;
	int res;
	
	//char buf[4];
	//char relbuf[13]; //真正要传出的数据，
	res = read(fd,buf,5);
	buf[res] = 0;
        printf ("res = %d\n",res);
	printf(":%s\n", buf);
	return res;
}