[ts-7000] not able to read data through com2 in TS7200

["soniathakur3" <>]

hi,

I have a gps module which i am interfacing with the com2 on TS7200.The
code i am using is :

#include <unistd.h>
#include <sys/types.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <errno.h>

int open_port(char* device_name)
{
        int fd;
        fd = open(device_name, O_RDWR | O_NOCTTY| O_NDELAY);
        if(fd == -1)
        {
        printf("Failed to open device \n");
        }
        return fd;
}


int read_port(int fd)
{
        char buffer[512];
        int count = 0;
        int lines;
        while (lines < 80)
        {
        ioctl(fd,FIONREAD, &count);
        if(count <= 0) return 0;
        count =read(fd, buffer,512);

        printf("the count is: %d\n",count);
        lines = lines + 1;
        /* Add terminator and print if non-zero */
        if(count > 0)
        {
        buffer[count] = '0\n';
        printf("%s\n",buffer);
        }
        else
        {
        printf("Zero characters read\n");
        }
        }
        }
void port_configuration(int fd)
{
struct termios options;
fcntl(fd, F_SETFL, FNDELAY);
tcgetattr(fd, &options);
printf("speed in %d out %d\n", options.c_ispeed, options.c_ospeed);
printf("mode in %d out %d\n", options.c_iflag, options.c_oflag);
printf("control flag %d\n", options.c_cflag);
printf("local flag %d\n", options.c_lflag);

options.c_cflag |=(CLOCAL|CREAD);
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
options.c_cflag |= CS8;
options.c_cflag &= ~CRTSCTS;
cfsetispeed(&options,B4800);
cfsetospeed(&options,B4800);

/* Enable data to be processed */
options.c_lflag &= ~(ICANON | ECHO | ECHOE |ISIG);
options.c_iflag &= ~(IXON | IXOFF | IXANY);
options.c_oflag &= ~ OPOST;
tcsetattr(fd, TCSANOW, &options);
}

int main(int argc, char*argv[])
{
extern int errno;
int fd;
/* check the command */
if(argc < 2)
{
printf("serial_tester<device>\n");
return 0;
}
/* Open the port */
printf("Opening device %s\n", argv[1]);
fd = open_port(argv[1]);
printf("the fd id is : %d\n",fd);
/* Get port configuration */
port_configuration(fd);

/* Set the port to non blocking and read the port */
read_port(fd);
printf("the error is : %d\n",errno);

close((fd));
return 0;
}
 and the result that i get is :
$ ./test /dev/ttyAM1
Opening device /dev/ttyAM1
the fd id is : 3
speed in 717120476 out 35296
mode in 256 out 4
control flag 3260
local flag 35360
the error is : 0

could someone help me and tell me what the problem is? I am a novice
and have very less knowledge of linux.

thanks 
sonia




 
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