//write a code to blink leds for button 0-7 and 1-6, 2-5 soon push buton reading
//hardware is same as 1st exp

#include <stdint.h>

#define PINA   (*(volatile uint8_t*)0x20)
#define DDRA   (*(volatile uint8_t*)0x21)
#define PORTA  (*(volatile uint8_t*)0x22)

#define PINB   (*(volatile uint8_t*)0x23)
#define DDRB   (*(volatile uint8_t*)0x24)
#define PORTB  (*(volatile uint8_t*)0x25)

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

int main(void){
    DDRA = 0xFF;      // LEDs output
    DDRB = 0x00;      // Buttons input

    while(1){
          uint8_t btn = PINB;
          if(btn !=0x00){
            for(uint8_t i=0; i<8; i++){
              if(btn == (1<<i)){
              PORTA = (1 << (7 - i));
                delay1sec();
                PORTA = 0x00;
                delay1sec();
              }
            }
          }
        else {
            PORTA = 0x00;
        }
    }
}