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

[Joerg Wunsch]

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. ;-)