author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Fri, 22 Jan 2010 18:26:19 +0000 | |
changeset 1 | 25a17d01db0c |
child 3 | 46218c8b8afa |
permissions | -rw-r--r-- |
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-C3C89BD7-A56D-4597-8804-01A25BC71581" xml:lang="en"><title>Data |
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Transfer between LDD and PDD</title><shortdesc>This document describes how LDDs and PDDs exchange data.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<section id="GUID-F65FC583-DDC7-40B6-B875-44A8D11A2971"> |
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<p>The device driver framework supplies each LDD with a pointer, <xref href="GUID-E7550422-5121-3393-A85E-BB797969CD2A.dita#GUID-E7550422-5121-3393-A85E-BB797969CD2A/GUID-CF58D3F1-8185-3A91-A7E8-338B43D329A5"><apiname>DLogicalChannelBase::iPdd</apiname></xref>, |
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through which it can access PDD functions. The pointer is initialised by the |
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Kernel while creating a physical channel. </p> <p>An example of this pointer |
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in use: </p> <codeblock id="GUID-55814834-E7CD-5F19-BA09-B91DA25C8FE3" xml:space="preserve">inline DExUartPhysicalChannel * DExDriverLogicalChannel::Pdd() |
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{ return (DExUartPhysicalChannel *)iPdd; } |
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// example use |
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Pdd()->SetDfcQ();</codeblock> <p>Similarly, a PDD can access a LDD, though |
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this access must be initialised by the LDD. In the following example, the |
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physical channel declares a pointer to a logical channel, which the LDD sets. |
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Callbacks to the LDD are done using this pointer. </p> <codeblock id="GUID-A4A52268-B5B9-53D4-9F69-B506F268201D" xml:space="preserve">// PDD channel class |
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class DExH4PhysicalChannel: public DBase |
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{ |
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... |
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public: |
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DExDriverLogicalChannel* iLdd; |
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} |
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// Second stage constructor of Logical channel |
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TInt DExDriverLogicalChannel::DoCreate(TInt /*aUnit*/, const TDesC8* |
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/*anInfo*/, const TVersion& aVer) |
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{ |
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... |
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Pdd()->iLdd=this; |
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} |
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// example use in PDD |
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iLdd->ReceiveDataComplete(KErrNone);</codeblock> <p>The logical channel class, <xref href="GUID-E7550422-5121-3393-A85E-BB797969CD2A.dita"><apiname>DLogicalChannelBase</apiname></xref>, |
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also has pointers to a logical device (<codeph>iDevice</codeph>) and a physical |
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device (<codeph>iPhysicalDevice</codeph>). These pointers are initialised |
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during the driver loading and channel open operations, so they can also be |
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used to pass information between the LDD and PDD. </p> <codeblock id="GUID-4B86BED0-22CB-53BC-A1C7-9BEB0CEA1EDE" xml:space="preserve">class DLogicalChannelBase: public DObject |
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{ |
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... |
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public: |
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DLogicalDevice* iDevice; |
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DPhysicalDevice* iPhysicalDevice; |
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DBase* iPdd; |
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} |
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// example use |
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TDynamicDfcQue* DExUartPhysicalChannelH4::DfcQ(TInt aUnit) |
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{ |
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... |
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return ((DExH4PhysicalDevice*) |
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(iLdd->iPhysicalDevice))->iDfcQueue; |
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}</codeblock> </section> |
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</conbody></concept> |