--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/commands/chkdrift/chkdrift.cpp	Wed Jun 23 15:52:26 2010 +0100
@@ -0,0 +1,154 @@
+// chkdrift.cpp
+// 
+// Copyright (c) 2008 - 2010 Accenture. All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+// 
+// Initial Contributors:
+// Accenture - Initial contribution
+//
+
+#include <hal.h>
+#include <fshell/ioutils.h>
+
+using namespace IoUtils;
+
+class CCmdChkdrift : public CCommandBase
+	{
+public:
+	static CCommandBase* NewLC();
+	~CCmdChkdrift();
+private:
+	CCmdChkdrift();
+private: // From CCommandBase.
+	virtual const TDesC& Name() const;
+	virtual void DoRunL();
+	};
+
+
+CCommandBase* CCmdChkdrift::NewLC()
+	{
+	CCmdChkdrift* self = new(ELeave) CCmdChkdrift();
+	CleanupStack::PushL(self);
+	self->BaseConstructL();
+	return self;
+	}
+
+CCmdChkdrift::~CCmdChkdrift()
+	{
+	}
+
+CCmdChkdrift::CCmdChkdrift()
+	{
+	}
+
+const TDesC& CCmdChkdrift::Name() const
+	{
+	_LIT(KName, "chkdrift");	
+
+	return KName;
+	}
+
+TInt NanoTickPeriod()
+	{
+	TInt nanoTickPeriod;
+	if (HAL::Get(HAL::ENanoTickPeriod, nanoTickPeriod) != KErrNone)
+		{
+		nanoTickPeriod = 1000;
+		}
+	return nanoTickPeriod;
+	}
+
+TInt FastCounterFrequency()
+	{
+	TInt fastCounterFrequency;
+	if (HAL::Get(HAL::EFastCounterFrequency, fastCounterFrequency) != KErrNone)
+		{
+		fastCounterFrequency = 1000;
+		}
+	return fastCounterFrequency;
+	}
+
+TBool FastCounterCountsUp()
+	{
+	TBool countsUp;
+	if (HAL::Get(HAL::EFastCounterCountsUp, countsUp) != KErrNone)
+		{
+		countsUp = EFalse;
+		}
+	return countsUp;
+	}
+
+void FormatTime(const TTimeIntervalMicroSeconds& aInterval, TDes& aBuf)
+	{
+	const TInt ms = 1000;
+	const TInt s = ms * ms;
+
+	TBuf<16> format(_L("%.2f "));
+
+	TReal interval = aInterval.Int64();
+	if (interval >= s)
+		{
+		interval /= s;
+		format.Append(_L("s"));
+		}
+	else if (interval >= ms)
+		{
+		interval /= ms;
+		format.Append(_L("ms"));
+		}
+	else
+		{
+		format.Append(_L("us"));
+		}
+
+	aBuf.Format(format, interval);
+	}
+
+void CCmdChkdrift::DoRunL()
+	{
+	TInt nanoTickPeriod = NanoTickPeriod();
+	Printf(_L("NKern tick period: %d\r\n"), nanoTickPeriod);
+	TInt fastCounterFrequency = FastCounterFrequency();
+	Printf(_L("Fast counter frequency: %d\r\n\r\n"), fastCounterFrequency);
+
+	Printf(_L("Press any key to start test\r\n"));
+	TBuf<1> key;
+	ReadL(key);
+	TUint fast1 = User::FastCounter();
+	TUint nano1 = User::NTickCount();
+
+	Printf(_L("Press any key to stop test\r\n"));
+	ReadL(key);
+	TUint fast2 = User::FastCounter();
+	TUint nano2 = User::NTickCount();
+
+	Printf(_L("before: nano: %u, fast: %u\r\n"), nano1, fast1);
+	Printf(_L("after: nano: %u, fast: %u\r\n"), nano2, fast2);
+	TUint64 diffNano = nano2 - nano1;
+	diffNano *= NanoTickPeriod();
+	TUint64 diffFast;
+	
+	if (FastCounterCountsUp())
+		{
+		diffFast = fast2 - fast1;
+		}
+	else
+		{
+		diffFast = fast1 - fast2;
+		}
+
+	TUint64 fastCounterPeriod = 1000000 / FastCounterFrequency();
+	diffFast *= fastCounterPeriod;
+	TBuf<32> timeNano;
+	FormatTime(diffNano, timeNano);
+	TBuf<32> timeFast;
+	FormatTime(diffFast, timeFast);
+	Printf(_L("difference:\r\n\tnano: %u ticks (%Lu us, %S)\r\n\tfast: %u ticks (%Lu us, %S)\r\n"), nano2 - nano1, diffNano, &timeNano, fast2 - fast1, diffFast, &timeFast);
+	}
+
+
+EXE_BOILER_PLATE(CCmdChkdrift)
+