testmodem.cpp

linux下modem初始化测试

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include "serial.h"

int init_modem(int fd)   
{
  	char buf[255];  
  	char *bufptr;     
  	int  nbytes;    
  	int  tries;    
  
	nbytes=comm_write(fd, "AT\r", 3);
	if(nbytes>0)
	{
		printf("nbytes=%d\n",nbytes);
		sleep(2);
		//fcntl(fd, F_SETFL, FNDELAY);
		bufptr = buf;
		while((nbytes=comm_read(fd,bufptr,1,gettickcount()+3000))>0)
		{
			printf("nbytes=%d\n",nbytes);
			bufptr += nbytes;
      			if (bufptr[-1] == '\n' || bufptr[-1] == '\r')
				break;
		}
			printf("nbytes=%d\n",nbytes);
    		
	
    			if (nbytes>=0)
      				return (0);
			else 
				return (-1);
	}
	else
  		return (-1);
}


int main(void)
{
	int fd;
	int check=1;
	struct termios options;

	//open the port 
	fd=comm_open("/dev/ttyS3",&options,(const char*)"9600, 8, 1, n,h");
	check=init_modem(fd);
	printf("check=%d\n",check);
	if(check==0)
		printf("modem ok...\n");
	else
		printf("modem bad...\n");
	close(fd);
	return 0;
}