From: Shawn Hargreaves <Shawn AT talula DOT demon DOT co DOT uk>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Joystick Polling Woes.
Date: Fri, 6 Feb 1998 18:42:58 +0000
Organization: None
Distribution: world
Message-ID: <2A3OUCAym120EwPB@talula.demon.co.uk>
References: <34DA37DC DOT 54205A4F AT student DOT umass DOT edu>
NNTP-Posting-Host: talula.demon.co.uk
MIME-Version: 1.0
Lines: 17
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Precedence: bulk

Paolo Piselli writes:
>Anyways, the function reads most of the axes (sp?) correctly for my 
>Gravis Pad, except when I press down (directly down, not diagonally) 
>the y-axis drops below the neutral axis value.

I think the problem is that you are only using 16 bit registers to count
the elapsed time, and on a fast PC these are likely to wrap when the
joystick is in an extreme position. I think you should rewrite this to
use a 32 bit counter.

For some working djgpp code, see the joystick.c and misc.s files from
Allegro.


--
Shawn Hargreaves - shawn AT talula DOT demon DOT co DOT uk - http://www.talula.demon.co.uk/
"Pigs use it for a tambourine" - Frank Zappa