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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25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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<?xml version="1.0" encoding="utf-8"?> |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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<!-- This component and the accompanying materials are made available under the terms of the License |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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"Eclipse Public License v1.0" which accompanies this distribution, |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
25a17d01db0c
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Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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<!-- Initial Contributors: |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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Nokia Corporation - initial contribution. |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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Contributors: |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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--> |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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<!DOCTYPE concept |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-C649DB97-F138-4C90-B177-16590F2E3F19" xml:lang="en"><title>DMA |
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Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
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Channels</title><shortdesc>This document describes how device drivers use DMA channels.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
25a17d01db0c
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<p>The DMAC has different DMA channels that can be configured for different |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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DMA transfers. Drivers generally initialise and open the required DMA channel |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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and use this channel to do the DMA transfers. For some peripherals, such as |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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the Camera and the Display controller, there can be dedicated DMA channels |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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that cannot be configured for DMA transfers by other peripherals. </p> |
25a17d01db0c
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Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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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. When used |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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by multi-threaded clients, synchronisation mechanisms should be provided by |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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the driver. </note> |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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<p>DMA channels must be opened before use and closed after completion of DMA |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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operations, as shown below. </p> |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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</conbody></concept> |