Path: chuka.playstation.co.uk!news
From: "Mario Wynands" <mariow@ihug.co.nz>
Newsgroups: scea.yaroze.programming.codewarrior,scee.yaroze.programming.codewarrior
Subject: Re: Disappearing variables - a better example
Date: Mon, 29 Dec 1997 00:09:10 +1300
Organization: PlayStation Net Yaroze (SCEE)
Lines: 48
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References: <684q0b$9ij5@chuka.playstation.co.uk>
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Xref: chuka.playstation.co.uk scea.yaroze.programming.codewarrior:265 scee.yaroze.programming.codewarrior:125

OK, here is some more slightly less obscure source that we should all be
familiar with.

#include <libps.h>
#include "pad.h"


u_long  pad_status;  // Controller status bitfield
u_long  pad_type;

volatile u_char *bb0, *bb1; // Low level buffers

void InitialisePad (void)
{
 pad_status = 0;
 pad_type = 0;
 GetPadBuf(&bb0, &bb1);
}


void UpdatePad(void)
{
 pad_status = (~(*(bb0+3) | *(bb0+2) << 8 | *(bb1+3) << 16 | *(bb1+2) <<
24));
 pad_type   = (~(*(bb0) | *(bb0+1) << 8 | *(bb1) << 16 | *(bb1+1) << 24));
}

int PadStatus(void)
{
 return pad_status;
}

int PadType(void)
{
 return pad_type;
}



UpdatePad crashes on the first line with a "bus error on data load" error,
which seems to indicate to me that something is seriously wrong.

Any ideas as to why Codewarrior may be trashing my variables?


Mario