Systime.c
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	#include "arke-avr.h"

	#include <avr/io.h>
	#include <avr/interrupt.h>

	volatile ArkeSystime_t systime;

	#if defined(__AVR_ATmega16m1__)
	#define START_TIMER0_1ms() do{ \
	TCCR0A = _BV(WGM01); \
	TCCR0B = _BV(CS01) \| _BV(CS00); \
	}while(0)
	#define OCIE0A_ENABLE() TIMSK0 = _BV(OCIE0A)
	#define OCIE0A_DISABLE() TIMSK0 = _BV(OCIE0A)
	#define LIBARKE_TIMER0_COMPA_VECT TIMER0_COMPA_vect
	#elif defined(__AVR_AT90CAN128__)
	#define START_TIMER0_1ms() do{ \
	TCCR0A = _BV(WGM01) \| _BV(CS01) \| _BV(CS00); \
	}while(0)
	#define OCIE0A_ENABLE() TIMSK0 = _BV(OCIE0A)
	#define OCIE0A_DISABLE() TIMSK0 = _BV(OCIE0A)
	#define LIBARKE_TIMER0_COMPA_VECT TIMER0_COMP_vect
	#else
	#error "Unssuported AVR device"
	#endif

	void ArkeInitSystime() {
	systime = 0;

	//frequency 16MHz/ ( N * (1+OCRnA))
	OCR0A = 249;
	OCIE0A_ENABLE();
	START_TIMER0_1ms();
	sei();
	}

	ISR(LIBARKE_TIMER0_COMPA_VECT) {
	++systime;
	}


	ArkeSystime_t ArkeGetSystime() {
	OCIE0A_DISABLE();
	ArkeSystime_t res = systime;
	OCIE0A_ENABLE();
	return res;
	}