Thread: Serial Port Access Denied using open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);

I am creating a program that opens a serial port for communication but it gets denied when I open it
I have installed a board that has two ports and have verified they are working by using the terminal:
dmesg | grep tty
console [tty0] enabled
0000:02:00.0: ttyS0 at I/O 0xdf00 (irq = 21) is a 16550A
0000:02:00.0: ttyS1 at I/O 0xde00 (irq = 21) is a 16550A

Code:

Code:

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


      fd = open("/dev/ttyS0", 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);
    }

open_port: Unable to open /dev/ttyS0 -: Permission denied
return code -1


Thank you
Greg

Solved!

chmod o+rw /dev/ttyS0
chmod o+rw /dev/ttyS1

Thank you anyways!
Greg