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Re: [avr-libc-dev] wdt problem with mega 88

From: Joerg Wunsch
Subject: Re: [avr-libc-dev] wdt problem with mega 88
Date: Wed, 22 Jun 2005 22:48:01 +0200
User-agent: Mutt/

As address@hidden wrote:

> I would expect this program to wait for a time and then turn on an
> led indefinately.

I don't have an ATmega88 around to test against, only an ATmega8.
I've inverted the logic for the LED (as the STK500 uses low-active
LEDs) and tried it on an ATmega8 in the STK500.  All works well there.

Oh, I just remembered I've also got an ATmega48 lying in a box.  Tried
it as well, works likewise.

I first tried to use the binary of the ATmega8 on the '48, that didn't
work.  Well, after all, the call/return would not work there due to
the smaller memory size (stack is initialized to the wrong value).
That reminds me: your linker settings are verified to be correct, are
they?  Omitting the -mmcu option from the linker command-line is a
common mistake it seems.

Btw., don't roll your own delay functions, GCC's optimizations
occasionally yield unexpected results.  Better use one of those
supplied in <avr/delay.h>.

cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)

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