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#include <stdint.h>

#include <stdlib.h>

#include <stdio.h>

#include <avr/interrupt.h>

#include <avr/io.h>

#include <avr/sfr_defs.h>

#include "clock-arch.h"

//Counted time

clock_time_t clock_datetime = 0;

//Overflow itnerrupt

ISR(TIMER0_OVF_vect)

{

        clock_datetime += 1;

        TIFR0 |= (1<<TOV0);

}

//Initialise the clock

void clock_init(){

        //Activate overflow interrupt for timer0

        TIMSK0 |= (1<<TOIE0);

        //Use prescaler 1024

        TCCR0B |= ((1<<CS12)|(1<<CS10));

        //Activate interrupts

        sei();

}

//Return time

clock_time_t clock_time(){

        clock_time_t time;

        cli();

        time = clock_datetime;

        sei();

        return time;

}