#define F_CPU 8000000L
#include <avr/io.h>
#include <util/delay.h>

// TESTING JARTZA'S MACROS
#include "avr_common_macros.h"
int main(void)
{
    // -------------------------------------------------------------------
    // Setup port directions and make pb0 til pb2 outputs.
    // -------------------------------------------------------------------

    BITS_SET(DDRB, PB0, PB1, PB2, PB3, PB4);

    // VS some messy code,

    //DDRB |= (1 << PB0) | (1 << PB1) | (1 << PB2) | (1 << PB3) | (1 << PB4);

    while(1)
    {
        // -------------------------------------------------------------------
        // Set one side of the chip high and the oher side of the chip low.

        BITS_SET(PORTB, PB0, PB1, PB2);
        BITS_CLEAR(PORTB, PB3, PB4);

        // VS some messy code.
        /*
        PORTB |= (1 << PB0);
        PORTB |= (1 << PB1);
        PORTB |= (1 << PB2);
        PORTB &= ~(1 << PB3);
        PORTB &= ~(1 << PB4);
        */
        _delay_ms(500);

        // -------------------------------------------------------------------
        // Now do the opposite,

        BITS_CLEAR(PORTB, PB0, PB1, PB2);
        BITS_SET(PORTB, PB3, PB4);

        // VS some messy code.
        /*
        PORTB &= ~(1 << PB0);
        PORTB &= ~(1 << PB1);
        PORTB &= ~(1 << PB2);
        PORTB |= (1 << PB3);
        PORTB |= (1 << PB4);
        */
        _delay_ms(500);
    }
}