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Adaptation/GUID-8FA1B2B0-5842-4D5D-BD61-C2D79B56ADC6.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-8FA1B2B0-5842-4D5D-BD61-C2D79B56ADC6" xml:lang="en"><title>Interrupt Service Routine (ISR)</title><shortdesc>This document describes interrupt service routines as used by device
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drivers.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>An ISR is a static function that will be executed when an interrupt occurs
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on the interrupt source bound to the ISR. </p>
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<codeblock id="GUID-E8416619-9314-5420-8EC1-F8BF804230DF" xml:space="preserve">// Interrupt service routines
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static void UartIsr(TAny* aParam);
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</codeblock>
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<p>An ISR performs the actions necessary to service the event of the peripheral
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that generated the interrupt and to remove the condition that caused it to
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interrupt. It queues a DFC to do the required processing. It disables the
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interrupts and FIQs on ARM, if required, to handle the interrupt, and enables
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them before leaving. It can also disable the source of the interrupt that
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it is servicing. </p>
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</conbody></concept>
MCL/sftools/depl/docscontent