3-Phase-Controller/Timer.h at master · rickyfajar93/3-Phase-Controller · GitHub

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/*
 * File:   Timer.h
 * Author: Blake
 *
 * Created on August 31, 2015, 12:35 PM
 */

#ifndef TIMER_H
#define	TIMER_H

#include <AVR++/basicTypes.h>
#include <avr/io.h>

using namespace AVR;

class Timer {
	/**
	 * clock prescaler on timer: /64
	 */
	static constexpr u1 CLKprescaler = 1;

	static constexpr u1 dividerShift =
		CLKprescaler == 1 ?  0 : // /1
		CLKprescaler == 2 ?  3 : // /8
		CLKprescaler == 3 ?  6 : // /64
		CLKprescaler == 4 ?  8 : // /256
		CLKprescaler == 5 ? 10 : // /1024
		0xff;

	static constexpr u2 divider = 1 << dividerShift;

public:
	/**
	 * The number of counts that the timer will count to before overflowing
	 */
	static constexpr u2 CountsPerClear = 16000;

private:
	static constexpr u2 TOP = CountsPerClear - 1;

	static constexpr u4 Frequency = F_CPU / (divider * (1 + TOP));

public:

	static void init();

	/**
	 * Return current timer value
	 */
	inline static u2 getCurTime() {return TCNT3;};

	/**
	 * Difference between an old time and now
	 */
	static u2 getSince(const u2 time);

};


#endif	/* TIMER_H */