#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#define S_ALL (_BV(PE2) | _BV(PE3) |_BV(PE4)| _BV(PE5))

    volatile uint8_t buttonpressed = 0;
//interrupt service routine for  ext. int. on PORT 6
ISR(INT6_vect)
{
    //invert LED1
    PORTG ^= _BV(PORT1);
}

//interrupt service routine for timer1
ISR(TIMER1_COMPA_vect)
{
    static uint8_t old_state = S_ALL;
    uint8_t new_state = PINE & S_ALL;
    if (new_state < old_state) {
            buttonpressed = 1;

    }

}



int main(void)
{


    // insert code here

    //set LED1,2 as output, set S1,...,5 as input with internal pullup
    DDRG |= _BV(DD0) | _BV(DD1);
    PORTE |= _BV(PORT2) | _BV(PORT3) | _BV(PORT4) | _BV(PORT5) | _BV(PORT6);
    DDRE &= ~(_BV(DD2) | _BV(DD3) | _BV(DD4) | _BV(DD5) | _BV(DD6));

    //se int6 on falling edge
    EICRB |= _BV(ISC61);
    EICRB &= ~(_BV(ISC60));
    //enable INT6
    EIMSK |= _BV(INT6);

    //set timer compare reg. for interrupt every 40ms~25Hz, 7.3728M, 64x prsc, OCR1A = 7.3728/64/25 = 4608
    OCR1A = 4608;

    //set timer1 CTC
    TCCR1A &= ~(_BV(WGM10) | _BV(WGM11));
    TCCR1B &= ~(_BV(WGM13));
    TCCR1B |= _BV(WGM12);

    //set timer1 prsc to 64
    TCCR1B &= ~(_BV(CS12));
    TCCR1B |= _BV(CS10) | _BV(CS11);

    //enble tim comp1a interrupt
    TIMSK |= _BV(OCIE1A);

    //enable global interrupts
    sei();



    while(1)
    {
    if (buttonpressed)
    {
        buttonpressed=0;
    PORTG ^= _BV(PORT0);
    }
    }


    return 0;
}








/*
#include <avr/io.h>
#include <util/delay.h>
#include "blik.h"
#include <avr/pgmspace.h>
#include <avr/interrupt.h>





ISR(INT6_vect)
{
   // PORTG = PORTG ^ _BV(PG1); //XOR - preklopeni, 11 je 0, 01 je 1

}

ISR(TIMER1_COMPA_vect)
{
    PORTG = PORTG ^ _BV(PG1); //XOR - preklopeni, 11 je 0, 01 je 1
#define S_ALL (_BV(PE2
static uint8_t old_state = PINE & S_ALL;
uint8_t
}






int main(void)


{
//   uint8_t morse[] = {1,0,1,0,1,0,0,1,1,1,0,1,1,1,0,1,1,1,0,0,1,0,1,0,1,0,0,0,0,0,0,0,0,0};

    DDRG |= _BV(PG1);
    DDRG |= _BV(PG2);
    PORTE |= _BV(PE2) |  _BV(PE3) |  _BV(PE4) |  _BV(PE5) |  _BV(PE6) ; //interrupty: 17.1.1
    EICRB |= _BV(ISC61)  ; //int 6 aktivace na falling edge
    EICRB &= ~(_BV(ISC60)); //vynulujeme 60
    EIMSK |= _BV(6);
    sei();

// timer setup

TCCR1A&= ~(_BV(WGM10) | _BV(WGM11)); //vynuluju tyhle bity. TOP je OCR1A (mode4 )
TCCR1B&= ~(_BV(WGM13));
TCCR1B&= _BV(WGM12);

OCR1A=4608; // 40ms...25Hz je kmitocet preklapeni , 7.37M, 64x prescaler OCR1A = 7.3728M/64/25
TCCR1B&= ~_BV(CS12);
TCCR1B&= _BV(CS11) | _BV(CS10);

TIMSK=_BV(OCIE1A);
//str. 189, Bit 4 – OCIE1A: Timer/Counter1, Output Compare A Match Interrupt Enable pouzijeme tento, Bit 2 – TOIE1: Timer/Counter1, Overflow Interrupt Enable bychom pouzili jen pri pouhem preteceni, kdybt pocital do konce











    while (1) {
































































                    PORTG |= _BV(pin);
                    _delay_ms(1000);
                    PORTG &= ~_BV(pin); //led 1 is turned off. PORTG = PORTG & 0b11111101 - this is called mask.
                    _delay_ms(1000);


                for (int i=0;i<32;i++) {

                    blik(1,morse[i]);
                  }

                //PORTG = PORTG & 0b11111101
                for (uint8_t i = 0; i < 4; i++) {
                    uint8_t pomocna = 0;
                    pomocna = pgm_read_byte(&pole[i]);
                    for (uint8_t j = 0; j < 8; j++) {
                        uint8_t pomocna2 = 0;
                        pomocna2 = pomocna & 1; //vezmu bit
                        blik(1, pomocna2);
                        pomocna = pomocna >> 1;
                    }

                }

    }

    return 0;

}
*/