#include <avr/io.h>
#include <stdlib.h>
#include <string.h>
#include <util/delay.h>
 
#ifndef _BV
#define _BV(bit)        (1<<(bit))
#endif
#ifndef sbi
#define sbi(reg,bit)    reg |= (_BV(bit))
#endif
 
#ifndef cbi
#define cbi(reg,bit)    reg &= ~(_BV(bit))
#endif

#ifndef tbi
#define tbi(reg,bit)    reg ^= (_BV(bit))
#endif

void blinkLEDs() {
  PORTD = 0xff;
   _delay_ms(500);
   PORTD = 0x00;
   _delay_ms(500);
}

int main() {
 
  
  //DDRD=0xff;
  //DDRD |= (1<<PD0)|(1<<PD1)|(1<<PD2)|(1<<PD3)|(1<<PD4)|(1<<PD5)|(1<<PD6)|(1<<PD7);

  sbi(DDRD, PD0);
  sbi(DDRD, PD1);
  sbi(DDRD, PD2);
  sbi(DDRD, PD3);
  sbi(DDRD, PD4);
  sbi(DDRD, PD5);
  sbi(DDRD, PD6);
  sbi(DDRD, PD7);

  _delay_ms(500);

  while(1) {
    blinkLEDs();
  }
 
  /*while (1) {
    for (uint8_t i = 0; i < 8; i++)
      tbi(PORTD, i);
    _delay_ms(500);
  }*/
  
  /*while (1) {
   PORTD |= (1<<PD0)|(1<<PD1)|(1<<PD2)|(1<<PD3)|(1<<PD4)|(1<<PD5)|(1<<PD6)|(1<<PD7);
   _delay_ms(500);
    PORTD ^= (1<<PD0)|(1<<PD1)|(1<<PD2)|(1<<PD3)|(1<<PD4)|(1<<PD5)|(1<<PD6)|(1<<PD7);
   _delay_ms(500);
  }*/

  /*while (1) {
    PORTD = 0xff;
    _delay_ms(500);
    PORTD = 0x00;
    _delay_ms(500);
  }*/
}