#include <stdio.h>   /* Standard input/output definitions */
    #include <string.h>  /* String function definitions */
    #include <unistd.h>  /* UNIX standard function definitions */
    #include <fcntl.h>   /* File control definitions */
    #include <errno.h>   /* Error number definitions */
    #include <termios.h> /* POSIX terminal control definitions */

    /*
     * 'open_port()' - Open serial port 1.
     *
     * Returns the file descriptor on success or -1 on error.
     */

    int
    open_port(void)
    {
      int fd; /* File descriptor for the port */


      fd = open("COM6", O_RDWR | O_NOCTTY | O_NDELAY);
      if (fd == -1)
      {
       /*
	* Could not open the port.
	*/

	perror("open_port: Unable to open /dev/ttyS0 - ");
      }
      else
	fcntl(fd, F_SETFL, 0);

      return (fd);
    }


int main()
{
  int fd;
  char a;

  struct termios options;



  fd = open_port();
  printf("open_port returns %d \n",fd);

  
    // Get the current options for the port...
    tcgetattr(fd, &options);

    // Set the baud rates to 19200...
    cfsetispeed(&options, B300);
    cfsetospeed(&options, B300);

    // Enable the receiver and set local mode...
    options.c_cflag |= (CLOCAL | CREAD);

    // Set the new options for the port...
    tcsetattr(fd, TCSANOW, &options);

  


    
  while(1)
    {
      a = rand() & 0x7f;
      printf("%x ",a);
    write(fd,&a,1);
  }
  
  close(fd);

  return 1;

}