timer.h

LCD using AVR controller

/*	Timer.h
*
*	Accurate timing.
*
*	#define one of the following values to select the appropriate code
*	based on your microcontroller and desired Timer/Counter (T/C) usage.
*
*		define      T/C
*		---------   ---
*		TIMER_0      0
*		TIMER_2      2
*
*	Valid combinations:
*
*		ATmega   CLOCK_    T/C
*		------   -------   ----
*		8        8M, 16M      2
*		16, 32   8M        0, 2
*		             16M      2
*		644      8M        0, 2
*		             16M      2
*		128      8M        0, 2
*		             16M   0
*
*	Revisions:
*		07-13-06	included in LCDSample project
*		07-05-06	version 1 in master library
*
*	Written by Cathy Saxton
*	[e-mail]
*/

#pragma once

class TIMER
{
public:
	/* constructor for initializing Timer/Counter for timing */
	TIMER();

	/* returns number of ms since Timer initialized */
	ulong MsCur() const;
	/* returns true if the specified number of milliseconds
	   has passed since the start time (else returns false) */
	bool FElapsed(ulong msStart, ulong msWait) const;
	/* pauses (waits) for the specified number of milliseconds */
	void WaitMs(uint ms) const;

private:
	static void Init();
	
	/* static variable: one per class, not instance */
	static bool s_fInit;
};