[oddjob]

If you need an edge trigger rather than level trigger, do something like this - assuming that variable 'buttons' holds the state of the joystick(s) buttons, and 'old_buttons' keeps track of the previous state of the buttons:

  if(buttons!=old_buttons)
  {
    if((buttons&0x1)==0)      /* example - bit 0 is the button to react to */
    {
      do_something_here();    /* execute once per button push */
    }
  }
  old_buttons=buttons;