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Adaptation/GUID-C649DB97-F138-4C90-B177-16590F2E3F19-GENID-1-2-1-10-1-5-1-5-1-1-7-1-9-1-3-1.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
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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-C649DB97-F138-4C90-B177-16590F2E3F19-GENID-1-2-1-10-1-5-1-5-1-1-7-1-9-1-3-1" xml:lang="en"><title>DMA Channels</title><shortdesc>Describes how device drivers use DMA channels.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>The DMAC has different DMA channels that can be configured for
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different DMA transfers. For some peripherals, such as the Camera
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and the Display controller, there can be dedicated DMA channels that
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cannot be configured for DMA transfers by other peripherals. However,
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drivers generally initialize and open a multi-purpose DMA channel
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and use that channel to perform the DMA transfers.</p>
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<p>Initialization and opening of DMA channels is done using the interface <xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita"><apiname>TDmaChannel</apiname></xref>. </p>
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<note>This class is designed only for single-thread client access.
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When used by multi-threaded clients, synchronization mechanisms should
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be provided by the driver. </note>
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<p>DMA channels must be opened before use and closed after completion
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of DMA operations. </p>
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</conbody></concept>
MCL/sftools/depl/docscontent