#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>

#define LED PB0
#define LED_PORT PORTB
#define LED_DDR DDRB

#define BUTTON PD7
#define BUTTON_PIN PIND
#define BUTTON_PORT PORTD


#define LED_ON() do {(LED_PORT |= _BV(LED)); } while(0)
#define LED_OFF() do {(LED_PORT &= ~_BV(LED)); } while(0)
#define BUTTON_ON() bit_is_clear(BUTTON_PIN, BUTTON)



void initTimer(void) {
    //timer1
    TCCR1B |= (1 << WGM12); // TC1 CTC  top at  OCR1A
    TCCR1B |= (1 << CS11) ; //cpu/8
    // initialize counter
    TCNT1 = 0;
    // initialize compare value (10ms)
    OCR1A = 19999;
    // enable compare interrupt
    TIMSK1 |= (1 << OCIE1A);
    // enable global interrupts
    sei();
}

volatile uint8_t bufor[100] = {0};
volatile uint8_t index = 0;

ISR (TIMER1_COMPA_vect)
{
        LED_OFF();
        if (index == 99){
            index = 0;
        }
        if (bufor[index]){
            LED_ON();
            bufor[index] = 0;
        }

        if (BUTTON_ON()){
            bufor[index] = 1;
        }
        index++;
}

int main()
{
    //bufor setup
    //sleep mode select - IDLE
    set_sleep_mode(SLEEP_MODE_IDLE);
    //port setup
    LED_DDR = (1 << LED);
    BUTTON_PORT |= (1 << BUTTON);
    initTimer();
    while (1)
    {
        sleep_mode();
    }
}