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

#define PA1_SET_MASK 0x02
#define PA2_SET_MASK 0x04
#define PA3_SET_MASK 0x08
#define PA6_SET_MASK 0x40
#define PA7_SET_MASK 0x80

int main(void)
{
    VPORTA.DIR = 0x0;

    // Configure PA1 as output (Pin 4 on ATTINY202-SSN)
    VPORTA.DIR |= PA1_SET_MASK;

    // Configure PA2 as output (Pin 5 on ATTINY202-SSN)
    VPORTA.DIR |= PA2_SET_MASK;

    // Configure PA3 as output (Pin 7 on ATTINY202-SSN)
    VPORTA.DIR |= PA3_SET_MASK;

    // Configure PA6 as output (Pin 2 on ATTINY202-SSN)
    VPORTA.DIR |= PA6_SET_MASK;

    // Configure PA7 as output (Pin 3 on ATTINY202-SSN)
    VPORTA.DIR |= PA7_SET_MASK;

    while (1)
    {
        VPORTA.OUT ^= PA1_SET_MASK; // toggle PA1
        VPORTA.OUT ^= PA2_SET_MASK; // toggle PA2
        VPORTA.OUT ^= PA3_SET_MASK; // toggle PA3
        VPORTA.OUT ^= PA6_SET_MASK; // toggle PA6
        VPORTA.OUT ^= PA7_SET_MASK; // toggle PA7

        _delay_ms(500);
    }
}