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Adaptation/GUID-D003030D-8506-4210-9194-7A3819205D68.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
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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-D003030D-8506-4210-9194-7A3819205D68" xml:lang="en"><title>Hardware
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Registers</title><shortdesc>This document describes how device drivers use hardware registers.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<section id="GUID-47A733FB-8AC9-40A0-B879-C8C01B0AB1ED">           <p>The
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APIs to access hardware peripheral registers are provided by a Symbian base
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port. For example, the base port for the OMAP 2420 provides the <codeph>TOmap::SetRegister()</codeph> and <codeph>TOmap::GetRegister()</codeph> functions
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to access its peripheral controller registers. Peripheral drivers would generally
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use these APIs. Some examples: </p> <ol id="GUID-78156A20-8B2F-52FB-8A9F-159B6EE8714E">
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<li id="GUID-330A1D4C-E054-5DC3-A1F5-D85A9F600834"><p>To set the UART LCR
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register: </p> <codeblock id="GUID-35EE35C4-B89B-52D1-AC25-13C63BA55435" xml:space="preserve">TOmap::SetRegister8(iPortAddr+KHoUART_LCR, KHbUartLCRFifoConfig);</codeblock> </li>
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<li id="GUID-06BE62D4-4ED7-5186-A191-9908C10B1C7E"><p>To get the UART MDR
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register: </p> <codeblock id="GUID-64F8101B-CDDF-57E9-93D4-08B4BBA117CB" xml:space="preserve">TOmap::Register8(iPortAddr+KHoUART_MDR1)</codeblock> </li>
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<li id="GUID-D549BAC4-5842-5E8D-B086-28A5366DBC4D"><p>To modify only the specified
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bits of the register: here, the UART LCR register bit 6 is being set to 0
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(LCR[6] = 0) </p> <codeblock id="GUID-C705FB36-1D4E-557F-B30D-6B6AD21E5B5C" xml:space="preserve">TOmap::ModifyRegister8(iPortAddr+KHoUART_LCR,
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                  (TUint8)KHtUartLCRBreakEnable,
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                  (TUint8)KSetNone);</codeblock> </li>
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</ol>     </section>
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</conbody></concept>
MCL/sftools/depl/docscontent