//connect leds to port A glow in this order 0,2,1,3,4,6,5,7

#include <stdint.h>

#define DDRA  (*(volatile uint8_t*)0x21)
#define PORTA (*(volatile uint8_t*)0x22)

uint8_t pattern[8] = {0, 2, 1, 3, 4, 6, 5, 7};

void delay1sec(void){
    TCNT1  = 0;
    TCCR1A = 0x00;
    TCCR1B = 0x05;          
    while (TCNT1 < 15625);
    TCCR1B = 0x00;
}

void setup() {
    DDRA = 0xFF;            
}

void loop() {
    for (uint8_t i = 0; i < 8; i++) {
        PORTA = (1 << pattern[i]);
        delay1sec();
        PORTA = 0x00;
        delay1sec();
    }
}