The joystick's POV hat takes the place of the "pN_wheel", where N is the number of the joystick port you're using. I can only really speak for the joystick which I have right in front of me (the other is at my house, being used to play TIE Fighter
), so YMMV. The two least significant bits of the value change too erratically to be of any use. Here's a listing of the values of the variable when the POV hat is in different positions:
Neutral: 001011xx
Up Left: 111111xx
Up: 111111xx
Up Right: 111111xx
Left: 011000xx
Right: 110010xx
Down Left: 101001xx
Down: 100101xx
Down Right: 110101xx
The x's take the place of the two least significant bits, which, as I said earlier, change randomly (at least with this single joystick).
Basically, if you can understand binary, you can take advantage of the POV hat for controlling your robot.
Hope this helps.