--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/PDK/Source/GUID-F8AC78AB-D1D8-4342-A773-9804723989D0.dita	Tue Mar 30 11:56:28 2010 +0100
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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 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: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-F8AC78AB-D1D8-4342-A773-9804723989D0" xml:lang="en"><title>GPIO
+Implementation Guide</title><shortdesc>Provides information to create a platform specific implementation
+of the Symbian platform generic GPIO interface. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>GPIO provides new implementation infrastructure that platforms may choose
+to use when implementing the GPIO programming interface.  Platforms can update
+their GPIO support to use this. The driver programming interfaces also provided
+in this guide You can provide support for GPIO hardware in a board support
+package by implementing the interface that Symbian platform defines in the
+GPIO class.</p>
+<section id="GUID-BCDC252F-7466-4391-9E42-26D173FA4E50">       <title>Required
+background</title>       <p>Before you start, you must know the following:</p><ul>
+<li><p>Platform implementation.</p></li>
+<li><p>GPIO concepts and terminology.</p></li>
+<li><p>Architecture of the platform on which you are implementing.</p></li>
+<li><p>C++ signature of the functions you are implementing.</p></li>
+</ul>     </section>
+<section id="GUID-3F5A1CB6-7717-48A3-B63A-CB843D7F7054"><title>Implementation</title><p> To
+provide a consistent interface to clients of the GPIO class, your implementation
+must return certain error codes in certain specified conditions. The functions
+are mainly categorized into:</p><ul>
+<li><p><xref href="GUID-9AD35939-26DD-4A42-8727-D0FD2F45B6DE.dita">Pin mode functions</xref></p></li>
+<li><p><xref href="GUID-DA8526FB-5789-4CB6-9A92-754E39C52E3B.dita">Pin direction
+functions</xref></p></li>
+<li><p><xref href="GUID-96CA3539-8C01-4EFE-8DE8-1F88C0607E02.dita">Pin bias functions</xref></p></li>
+<li><p><xref href="GUID-D948E88E-D123-40A5-A2CD-CF3D13581CC9.dita">Pin idle functions</xref></p></li>
+<li><p><xref href="GUID-153E6611-D7BC-4B5B-A5C4-38BCA16C1635.dita">Interrupt functions</xref></p></li>
+<li><p><xref href="GUID-74FE6572-14B9-4B94-8DD0-803DA21D14A3.dita">Wakeup functions</xref></p></li>
+<li><p><xref href="GUID-BAE9F3A8-E232-491B-9F29-E2BF7298F9EA.dita">Trigger functions.</xref></p></li>
+<li><p><xref href="GUID-9E7F8D0B-2B0E-41CC-BCDF-6B01B56CEF37.dita">Debounce functions</xref></p></li>
+<li><p><xref href="GUID-90E2A645-56B0-4FC2-AE92-CD72FEC23AE6.dita">Input and Output
+functions</xref></p></li>
+</ul><p> The details of the functions, modes, associated required return values
+and their usage are described in their respective sections.</p><note> Implementation
+of the functions communicates with your GPIO hardware will be specific to
+the hardware you are using.</note></section>
+<section id="GUID-0D4BD293-329B-4549-A36B-A428FE1BE57A"><title>See Also</title><p><xref href="GUID-A5D862E4-3EC3-45C0-B635-23A02E5BB11F.dita">GPIO Overview</xref></p></section>
+</conbody></concept>
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