[avr-gcc-list] Strange delay behavior

[Per-Tore Aasestrand]

Hello list,

I've suddenly run into something odd. I am using AVR Studio Version 4.12
Service Pack 4 with WinAVR 20060421. Have been using this setup for a
while without any problems.

Now, running the following test program on a ATmega128 @ 8 MHz, produces
pulses on PC3. However, with 'off' period of 1,45 ms and 'on' period of
2,45 ms and. I had of course expected 1ms and 2 ms,
respectively.

I ran the same program using CodeVision, and then the periods were
OK.

Guess I've overlooked something.
Any idea, someone?

Regards,

Per-Tore

#define F_CPU 8000000UL

#include <avr/io.h>
#include <util/delay.h>

int main(void)
{

        

//
Initialize I/O Ports

        

DDRC 
=
0x08;

   

        

        

// PC3:
output

        

for(;;)

        

{

        

        

PORTC =
0x00;

        

        

_delay_ms(1);

        

        

PORTC =
0x08;

        

        

_delay_ms(2);

        

}
}

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