1 // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 #ifndef TAVSRCTIMER_H

    17 #define TAVSRCTIMER_H

    18 

    19 #include <e32base.h>

    20 

    21 class CAdaptiveHighResPeriodic;

    22 

    23 class MAdaptiveHighResPeriodicClient

    24 	{

    25 public:

    26 	virtual void TimerEvent(CAdaptiveHighResPeriodic& aTimer)=0;

    27 	virtual void TimerError(CAdaptiveHighResPeriodic& aTimer, TInt aError)=0;

    28 	};

    29 

    30 //adapts the callback to counter drift	

    31 class CAdaptiveHighResPeriodic : public CTimer

    32 	{

    33 public:

    34 	static CAdaptiveHighResPeriodic* NewL(MAdaptiveHighResPeriodicClient& aClient);

    35 	~CAdaptiveHighResPeriodic();

    36 	void Start(TTimeIntervalMicroSeconds32 aPeriod);

    37 

    38 	void SetInterval(TTimeIntervalMicroSeconds32 aInterval);

    39 	

    40 private:

    41 	CAdaptiveHighResPeriodic(MAdaptiveHighResPeriodicClient& aClient);

    42 	void ConstructL();

    43 	void RunL();

    44 	TInt RunError(TInt aError);

    45 	void StartTimer(TTimeIntervalMicroSeconds32 aInterval);

    46 	

    47 private:

    48 	MAdaptiveHighResPeriodicClient& iClient;

    49 

    50 	// HAL stuff

    51 	TBool	iFastCounterIncreases;

    52 	TInt	iFastCounterFreq;

    53 	TReal	iFastCounterFreqUs;

    54 	TReal	iExtraCounts;

    55 	

    56 	// what the client asked for in musecs

    57 	TTimeIntervalMicroSeconds32	iInterval;

    58 

    59 	TUint	iIntendedCountOnCallback ;	// the hoped for fast counter reading on callback

    60 	};

    61 

    62 #endif // TAVSRCTIMER_H