#include <stdint.h>

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

uint8_t alpha[] = {
    0x77, 0x7C, 0x39, 0x5E, 0x79,
    0x71, 0x3D, 0x76, 0x30, 0x1E,
    0x38, 0x54, 0x5C, 0x73, 0x50,
    0x6D, 0x78, 0x3E, 0x6E
};

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

int main(void){
    DDRA = 0x7F;

    while (1){
        for (uint8_t i = 0; i < sizeof(alpha); i++){
            PORTA = alpha[i];
            delay1sec();
        }
    }
}