#include <avr/io.h>
#include <util/delay.h>
#include <avr/wdt.h>
int cnt=0;
int vdly=1;
void Delay(int vdly);
int main(void)
{
    DDRA=0xFF;
    PORTA=0xAA;
    //  MCUSR &= ~(1<<WDRF);
    /* In order to change WDE or the prescaler, we need to
    * set WDCE (This will allow updates for 4 clock cycles).
    */
    // WDTCSR  &= ~((1<<WDP3) | (1<<WDP0)|(1<<WDIF)|(1<<WDIE));
    WDTCSR |= (1<<WDCE) | (1<<WDE);
    WDTCSR = (1<<WDE) | (1<<WDP3) | (1<<WDP0);

    while(1)
      {
        PORTA=~cnt++;
        Delay(vdly++);
        __asm__ __volatile__ ("wdr"); // wdt_reset();
      }
}
    void Delay(int vdly) 
    {
        while(vdly--){
        _delay_ms(2000);
        }
    }