//connect 8 LEDs to portA glow 0-7 with delay and reverse it like 7-0 with delay
//same hardware as before ass 1 and 2
#include <stdint.h>

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

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 << i);
        delay1sec();
    }

    for (int8_t i = 7; i >= 0; i--) {
        PORTA = (1 << i);
        delay1sec();
    }
}