diff -r 000000000000 -r a41df078684a kerneltest/e32test/misc/t_lbk.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kerneltest/e32test/misc/t_lbk.cpp	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,113 @@
+// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "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:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// e32test\misc\t_lbk.cpp
+// 
+//
+
+#include <e32test.h>
+#include <d32comm.h>
+
+RTest test(_L("LoopBack"));
+
+#define TEST(c)	((void)((c)||(test.Printf(_L("Failed at line %d\n"),__LINE__),test.Getch(),test(0),0)))
+
+const TInt KBufferSize=4096;
+
+_LIT(KLddName,"ECOMM");
+_LIT(KPddName,"EUART");
+
+TUint8 Buffer[2*KBufferSize];
+
+void LoadCommDrivers()
+	{
+	test.Printf(_L("Load LDD\n"));
+	TInt r=User::LoadLogicalDevice(KLddName);
+	TEST(r==KErrNone || r==KErrAlreadyExists);
+
+	TInt i;
+	TInt n=0;
+	for (i=-1; i<10; ++i)
+		{
+		TBuf<16> pddName=KPddName();
+		if (i>=0)
+			pddName.Append('0'+i);
+		TInt r=User::LoadPhysicalDevice(pddName);
+		if (r==KErrNone || r==KErrAlreadyExists)
+			{
+			++n;
+			test.Printf(_L("%S found\n"),&pddName);
+			}
+		}
+	TEST(n!=0);
+	}
+
+GLDEF_C TInt E32Main()
+	{
+	RThread().SetPriority(EPriorityAbsoluteForeground);
+	test.SetLogged(EFalse);
+	test.Title();
+
+	TBuf<256> cmd;
+	User::CommandLine(cmd);
+	TInt port=0;
+	if (cmd.Length()!=0)
+		{
+		TUint8 c=(TUint8)cmd[0];
+		if (c>='0' && c<='9')
+			{
+			port=c-'0';
+			}
+		}
+
+	TInt r=KErrNone;
+	LoadCommDrivers();
+
+	RBusDevComm comm;
+	r=comm.Open(port);
+	test(r==KErrNone);
+	TCommConfig cfg;
+	TCommConfigV01& c=cfg();
+	comm.Config(cfg);
+	c.iRate=EBps115200;
+	c.iDataBits=EData8;
+	c.iStopBits=EStop1;
+	c.iParity=EParityNone;
+	c.iHandshake=0;
+	c.iFifo=EFifoEnable;
+	c.iTerminatorCount=0;
+	r=comm.SetConfig(cfg);
+	test(r==KErrNone);
+
+	TRequestStatus rxs, txs;
+	TRequestStatus* pS=&txs;
+	User::RequestComplete(pS,0);
+
+	TInt pos=0;
+	FOREVER
+		{
+		TPtr8 dptr(Buffer+pos,0,KBufferSize);
+		comm.ReadOneOrMore(rxs,dptr);
+		User::WaitForRequest(rxs);
+		if (rxs!=KErrNone)
+			test.Printf(_L("RX error %d\n"),rxs.Int());
+		User::WaitForRequest(txs);
+		if (txs!=KErrNone)
+			test.Printf(_L("TX error %d\n"),txs.Int());
+		comm.Write(txs,dptr);
+		if (pos)
+			pos=0;
+		else
+			pos=KBufferSize;
+		}
+	}