clock.c
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#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <LUFA/Common/Common.h>
#include "clock.h"
//Counted time
volatile clock_time_t clock_datetime = 0;
//Overflow interrupt
ISR(TIMER1_COMPA_vect, ISR_BLOCK)
{
clock_datetime += 1;
}
//Initialise the clock
void clock_init()
{
OCR1A = (((F_CPU / 1024) / 100) - 1);
TCCR1B = ((1 << WGM12) | (1 << CS12) | (1 << CS10));
TIMSK1 = (1 << OCIE1A);
}
//Return time
clock_time_t clock_time()
{
clock_time_t time;
GlobalInterruptDisable();
time = clock_datetime;
GlobalInterruptEnable();
return time;
}