Path: chuka.playstation.co.uk!scea!peter_alau@playstation.sony.com
From: Michael Briere <mikey@accessv.com>
Newsgroups: scea.yaroze.beginners
Subject: JOYSTICK FUNCTION
Date: Fri, 17 Jul 1998 13:03:52 -0400
Organization: SCEA News Server
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Hi! I need some explanation on how the joystick function u_long
PadRead(void) works.
Here's the complete function:

u_long PadRead(void)
{
    return(~(*(bb0+3) | *(bb0+2) <<8 | *(bb1 +3) << 16 | *(bb1+2)
<<24));
}

I understand that this reads the joystick and returns a value equal to
the button that was pressed as shown in the yellow manual. However I'd
love it if someone could show me the math behind this with an example.
ie. if PADLstart (bit 11) is pressed on joystick #1 which should be put
in the *bb0 pointer. I could spend hours trying to figure this out for
myself, but I'd really appreciate your help. I know the function works,
but I make it a habit of understanding the code I use in my programs.
Thanks!