clock.c 576 Bytes
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#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
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#include <LUFA/Common/Common.h>
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#include "clock.h"

//Counted time
volatile clock_time_t clock_datetime = 0;

//Overflow interrupt
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ISR(TIMER1_COMPA_vect, ISR_BLOCK)
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{
	clock_datetime += 1;
}

//Initialise the clock
void clock_init()
{
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	OCR1A  = (((F_CPU / 1024) / 100) - 1);
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	TCCR1B = ((1 << WGM12) | (1 << CS12) | (1 << CS10));
	TIMSK1 = (1 << OCIE1A);
}

//Return time
clock_time_t clock_time()
{
	clock_time_t time;

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	GlobalInterruptDisable();
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	time = clock_datetime;
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	GlobalInterruptEnable();
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	return time;
}
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