Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!ucbvax!ucdavis!pollux.ucdavis.edu!s110018
From: s110018@pollux.ucdavis.edu (0000;0000001007;4000;250;216;s110)
Newsgroups: comp.sys.amiga
Subject: Re: Joystick Port 2 in C in PD games?
Summary: Here you are
Keywords: Due to C= continuing support in correct documentation
Message-ID: <4642@ucdavis.ucdavis.edu>
Date: 13 Jun 89 05:22:33 GMT
References: <18380@unix.cis.pittsburgh.edu>
Sender: uucp@ucdavis.ucdavis.edu
Reply-To: s110018@pollux.ucdavis.edu (Bruce Rogers)
Organization: University of California, Davis
Lines: 43

In article <18380@unix.cis.pittsburgh.edu> smsst5@unix.cis.pittsburgh.edu (Steve M Suhy) writes:
>
>     Does anyone know of any cucug, amicus, or fish disks that contain
>any games or routines that contain C source for reading Port 2 of
>a joystick? Thanks for any response.
>
>-Steve

Here's a nice short way to do it. (Just a tad bit shorter than
the example by Rob Peck in the RKM.)

#include	<exec/types.h>
#define DMA_REGS	0xdff000
#define	JOY1DAT		0x00C+DMA_REGS

void	CheckJoystick()
{
USHORT	*joyPort2,joyData;
short	dirX,dirY,a,b,c,d;

	joyPort2=JOY1DAT;
	joyData=*joyPort2;
	dirX=dirY=0;
	a= ((joyData & 0x0002) >> 1);
	b= ((joyData & 0x0200) >> 9);
	c= ((joyData & 0x0001)	   );
	d= ((joyData & 0x0100) >> 8);
	c^=a;
	d^=b;
	if (a) dirX= 1;
	if (b) dirX=-1;
	if (c) dirY= 1;
	if (d) dirY=-1;

	/* Just check for dirX or dirY here */
}

	-Bruce Rogers
	-u586182058ea@deneb.ucdavis.edu


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