#include <avr/io.h>
#include <util/delay.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include <util/crc16.h>
#include <stdio.h>
#include <stdbool.h>
int main (void)
{
 DDRB = 0xFF;
 DDRC = 0xFF;
 DDRD = 0xFF;
 int i = 0;
 bool c = 0;
 while(1)
 {

  switch(c)
  {
	  case 0:
	  PORTB |= 1 << i;
	 // PORTD |= 1 << i;
	  break;
	  case 1:
	  PORTC |= 1 << i;
	  break;
  }
  _delay_ms(4000);
  if( i == 8 )
  {
	  c = !c;
	  i = -1;
  }
  ++i;
  PORTD = 0b00000000;
  PORTB = 0b00000000;
  PORTC = 0b00000000;
  }
  return 0;
}