[En-Nut-Discussion] Create new platform

[Michał Gryko]

Hi, I'm designing own platform as a student project. It's based on
ATmega 128. I want to use NutOS on it. Hardware is ready and I used
simple non NutOS app to test it. Here it is:

 #include <avr/io.h>

 // define what pins the LEDs are connected to.

 #define LED PC0
 #define F_CPU 16000000
 // Some macros that make the code more readable
 #define output_low(port,pin) port &= ~(1<<pin)
 #define output_high(port,pin) port |= (1<<pin)
 #define set_input(portdir,pin) portdir &= ~(1<<pin)
 #define set_output(portdir,pin) portdir |= (1<<pin)

 void delay_ms(uint8_t ms) {
  uint16_t delay_count = F_CPU / 17560;
  volatile uint16_t i;

  while (ms != 0) {
     for (i=0; i != delay_count; i++);
     ms--;
   }
 }

 int main(void) {
   set_output(DDRC, LED);

   while (1) {
     output_high(PORTC, LED);
     delay_ms(200);
     output_low(PORTC, LED);
     delay_ms(200);
}
}

It's working as intended (led blinks), but when I moved to NutOS with this:

#include <sys/timer.h>

int main(void)
{
	sbi(DDRC, 0);
	for(;;){
		cbi(PORTC, 0);
		NutSleep(500);
		sbi(PORTC, 0);
		NutSleep(500);
	}
	return 0;
}

build is ok, target mcu is atmega128, but nothing happens (led is
dead). Tried on ethernut-4.8.7 and 4.9. Board has no external memory.
Any ideas what could be wrong?