#define __AVR_ATmega2560__
#define F_CPU 16000000UL

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

void main() {
//     DDRB = 0b10000000;
// 
//     while(1) {
//         PORTB = 0b10000000;
//         _delay_ms(500);
//         PORTB = 0b00000000;
//         _delay_ms(500);
//     }

    DDRF  = 0b11111111;
    PORTF = 0b11111111;

    uint8_t a = 0;

    while(1) {
        PORTF = a++;
        _delay_ms(10);
    }
}