[ts-7000] Help connecting to GPS on com2

["Rob" <>]

I have been trying to connect to a Garmin GPS and just echo the NMEA data to 
the console 
for a proof of concept.  While I think I am getting closer it still just shows 
zero for the data 
received.  I have looked at many examples here and the code is starting to look 
correct.  
Also if I log onto the board using COM2 it asks for a password ???

Here is the code and the settings are the standard ones on the Debian release 
(using the 
CF card and Debian)

#include <stdio.h>
#include <termios.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>


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

int read_port(int file_id)
{
        char            buffer[512];
        int             count=0;
        int             lines = 0;
        
        while(lines < 50)
        {
                read(file_id, buffer, count);
                lines++;
                /* Add terminator and print if non-zero */
                if(count > 0)
                {
                        buffer[count] = '\0';
                        printf("Line %d has %d characters\n", lines, count);
                        printf("%s\n", buffer);
                }
                else
                {
                        printf("Zero characters read\n");
                }
        }
}

void port_configuration(int file_id)
{
        struct termios options;
        int            x;
        
        tcgetattr (file_id, &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);
        
        cfsetispeed(&options, B4800);
        cfsetospeed(&options, B4800);
        options.c_cflag = 2096;
        options.c_lflag = 4;
        options.c_oflag = 0;
        options.c_cflag |= (CLOCAL | CREAD);
        options.c_cflag &= ~PARENB;
        options.c_cflag &= ~CSTOPB;
        options.c_cflag &= ~CSIZE;
        options.c_cflag |= CS8; 
        options.c_cflag &= ~CRTSCTS;
        tcsetattr (file_id, TCSANOW, &options);
}

int main(int argc, char* argv[])
{
        int file_id;
        
        /* Check the command */
        if(argc < 2)
        {
                printf("serial_tester <device>\n");
                return 0;
        }
        /* Open the port */
        printf("Opening device %s\n", argv[1]);
        file_id = open_port(argv[1]);
        /* Get port configuration */
        port_configuration(file_id);
        /* Set the port to non bolocking and Read the port */
        read_port(file_id);
        close((file_id));
}


Thanks for helping a newbie out.  Also I am open to any suggested reading that 
would 
have let me find it myself.







 
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