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

void delay(void);

void delay_long(void);

int main(void) {

  DDRB = 0xFF;                   // port B is configured as output   DDRB : 0b11111111
  DDRB &= ~(1<<PB1);             // pin 1 of port B is configured as input  DDRB : 0b11111101
  PORTB = 0x00;                  // pins of port B are low (output) and with no pull-up resistor (input)
  PORTB |= (1<<PB0)|(1<<PB1);    // pin 0 is high (output) and pin 1 is pulled high (input)    PORTB : 0b00000011

  while(1) {
    PORTB &= ~(1<<PB0);
    delay();
    PORTB |= 1<<PB0;
    delay();
    PORTB = ~(1<<PB0);
    delay_long();
    PORTB = 1<<PB0;
    delay_long();
  }

  return 1;

}

void delay(void) {
  TCNT0 = 0x00;
  TCCR0B = 0x05;
  while ( (TIFR0 & TOV0) == 0 )
    ;
  TCCR0B = 0x00;
  TIFR0 |= 1<<TOV0;
}

void delay_long(void) {
  TCNT0 = 0x00;
  TCCR0B = 0x05;
  while ( (TIFR0 & TOV0) == 0 )
    ;
  TCCR0B = 0x00;
  TIFR0 |= 1<<TOV0;
  TCCR0B = 0x05;
  while ( (TIFR0 & TOV0) == 0 )
    ;
  TCCR0B = 0x00;
  TIFR0 |= 1<<TOV0;
}