Mercurial Mercurial > oss > MCL > sftools > depl > docscontent / annotate
summary | shortlog | changelog | graph | tags | bookmarks | branches | files | changeset | file | latest | revisions | annotate | diff | comparison | raw | help
Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Adaptation/GUID-660A8E4C-F930-415C-8CCC-CB1DCCAA2442.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
permissions -rw-r--r--
Initial contribution of the Adaptation Documentation.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
15
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     1
 
<?xml version="1.0" encoding="utf-8"?>
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     2
 
<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     3
 
<!-- This component and the accompanying materials are made available under the terms of the License
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     4
 
"Eclipse Public License v1.0" which accompanies this distribution,
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     5
 
and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     6
 
<!-- Initial Contributors:
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     7
 
    Nokia Corporation - initial contribution.
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     8
 
Contributors:
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     9
 
-->
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    10
 
<!DOCTYPE concept
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    11
 
  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    12
 
<concept id="GUID-660A8E4C-F930-415C-8CCC-CB1DCCAA2442" xml:lang="en"><title>Interrupts</title><shortdesc>This document describes how device drivers use interrupts.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    13
 
<section id="GUID-7B450286-637E-4BAB-9D36-9228764CD0D4">
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    14
 
      <p>Devices generate interrupts to indicate hardware events. Generally
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    15
 
drivers provide an interrupt service routine (ISR) to handle the interrupts
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    16
 
and perform the required responses to the events. Symbian provides an <xref href="GUID-E7A7083C-97B9-39B9-A147-4A6E314EE3A3.dita"><apiname>Interrupt</apiname></xref> class
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    17
 
(implemented by the ASSP) with an API to bind and unbind an interrupt source
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    18
 
and an ISR. </p> <codeblock id="GUID-9EB4BFFE-55A2-56D4-BCF3-6D278C3EC4F4" xml:space="preserve">// Bind the interrupt source ID and interrupt service routine
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    19
 
TInt Bind(TInt aId, TIsr aIsr, TAny* aPtr);
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    20
 
// Unbind the interrupt
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    21
 
TInt Unbind(TInt aId);
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    22
 
// Enable interrupts on device interrupt source
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    23
 
TInt Enable(TInt aId);
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    24
 
// Disable interrupts on device interrupt source
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    25
 
TInt Disable(TInt aId);
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    26
 
// Clear the device interrupt
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    27
 
TInt Clear(TInt aId);
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    28
 
// Set the priority of the interrupt
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    29
 
TInt SetPriority(TInt aId, TInt aPriority);</codeblock> <p>Interrupt handling
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    30
 
is typically done in a PDD, as device hardware access is done at that level.
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    31
 
Interrupt handling is generally done in two stages in the driver. High priority
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    32
 
and short time running tasks are done in the ISR, and the remaining processing
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    33
 
is deferred for handling later. </p> <p>Interrupt handling is a blocking high
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    34
 
priority task and needs to take a minimal amount of time. The Kernel will
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    35
 
be in an indeterminate state and puts restrictions on doing various operations. </p>
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    36
 
   </section>
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    37
 
</conbody></concept>
MCL/sftools/depl/docscontent