//connect 8 led to port c blink one by one

#include <stdint.h>

#define DDRC  (*(volatile uint8_t*)0x27)
#define PORTC (*(volatile uint8_t*)0x28)

void delay1sec(void){
    TCNT1  = 0;
    TCCR1A = 0x00;
    TCCR1B = 0x05;          

    while (TCNT1 < 15625);

    TCCR1B = 0x00;          
}

void setup() {
    DDRC = 0xFF;            
}

void loop() {
    for (uint8_t i = 0; i < 8; i++) {
        PORTC = (1 << i);   
        delay1sec();
        PORTC = 0x00;       
        delay1sec();
    }
}