Re: [avr-gcc-list] stumped by my ATmega48 (again)

[David Breeze]

Your loop is almost certainly optimsed out of existence.

try

volatile int x;


>>> <address@hidden> 05 October 2007 15:23 >>>
On Oct 05, 2007, at 12:14 UTC, David Kelly wrote:

> When you return the CPU goes thru a crash reset, or something like  
> that, I haven't traced the code.
> 
> Do something like this ...

OK, I tried this:

int main() {

        DDRB = 0xff;
        DDRC = 0x7f;
        DDRD = 0xff;

        PORTB = 0xFF;
        PORTC = 0x7F;
        PORTD = 0xFF;
        int x;
        while (1) {
                x++;
        }
        return 0;
}

..hoping that the busywork of incrementing x would keep the compiler
from stripping away the empty loop.  But the output still doesn't go
high.

Thanks,
- Joe

--
Joe Strout -- address@hidden 
Strout Custom Solutions, LLC



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