AN329 - Contributing a Configuration Database to DS-5

Application Node 329



 

Application Note 329
Contributing a Configuration Database to DS-5

Copyright © 2012 ARM Limited. All rights reserved.

                                                Release information

Change history

Date

Issue

Change

August 2012

October 2012

A

B

First release

Removed broken install option from section 4

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1.   Introduction

This Application Note describes how to add a default Configuration Database to DS-5. A Configuration Database describes target-specific information, such as how to connect and the register and peripherals that are made accessible within DS-5 Debugger. The intention is to enable third-party installers to add platform support to an already installed DS-5 installation.

A default Configuration Database can be added to DS-5 via an Eclipse extension point contributed from a plug-in. The extension point consists of a single Java interface, which provides an ordered list of Configuration Database paths when requested by DS-5. A provider is expected to implement the interface, produce the plug-in declaring the extension and add the plug-in to DS-5.

This Application Note is split into the following sections:

·         Configure a DS-5 development environment

Describes how to set-up an Eclipse environment to build plug-ins depending on DS-5

·         Create the Configuration Database extension

Describes how to create the provider extension and produce a plug-in

·         Add the Configuration Database extension to DS-5

Describes how to install the provider plug-in into an existing DS-5 installation

                                                Prerequisites

You must have:

·         An Eclipse installation containing the Plug-in Development Environment (PDE)

·         A DS-5 installation

·         A Configuration Database


2.   Configure a DS-5 development environment

                                                The first task is to configure your development environment for building a plug-in that contributes to DS-5 by creating a PDE target definition. A target definition will ensure plug-in projects are built against the exact plug-in set that defines DS-5.

1.     Start Eclipse and use a new workspace

2.     Select Window → Preferences

3.     Expand the Plug-in Development group and select Target Platform

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4.     Click Add

5.     Select Nothing: Start with an empty target definition

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6.     Click Next

7.     Enter a name for the new definition

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8.     On the Locations tab, Click Add

9.     Select Installation and click Next

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10.  Click Browse and navigate to sw/eclipse relative to root of your DS-5 installation

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11.  Click Finish

12.  Click Add again

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13.  Select Software Site and click Next

14.  Click Add

15.  Click Archive… and navigate to sw/eclipse/update-site.zip relative to the root of your DS-5 installation

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16.  Give the Repository a name and click OK

17.  Select the Eclipse plug-ins for DS-5 check box

18.  Deselect the Include required software check box

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19.  Click Finish

20.  Select the Environment tab

21.  Under Java Runtime Environment, select the Execution Environment check box and JavaSE-1.6 from the drop down

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22.  Click Finish

23.  Select the check box of the new definition to make it active

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3.   Create the Configuration Database extension

The second step is to create a new plug-in that implements the extension point for contributing Configuration Database paths.

1.     Create a new project

a)     Select File → New → Project

b)    Select Plug-in Project and click Next

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c)     Give the project a name

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d)    Click Next

e)     Deselect the Generate an activator… and This plug-in will make contributions to the UI check boxes

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f)     Click Finish

The plug-in editor should automatically open, if it does not, open the META-INF/MANIFEST.MF file from the newly created project.

2.     Add the required plug-in dependencies

a)     Click on the Dependencies tab

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b)    Click the Add button under Required Plug-ins

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c)     Type com.arm.ds.extension into the text field and click Ok

d)    Click Add again

e)     Type org.eclipse.core.runtime into the text field and click Ok

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3.     Declare the extension

a)     Click on the Extensions tab

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b)    Click Add

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c)     Select com.arm.ds.extension.configdb.pathprovider from the list and click Finish

d)    Right-click on the com.arm.ds.extension.configdb.pathprovider entry and select New → provider

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e)     Change the name of the class field to the name to be given to the provider implementation class

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f)     Save the project

4.     Implement the provider class

a)     Click on the class link next to the provider class name, the New Java Class dialog will open with appropriate defaults

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b)    Click Finish

c)     Complete the provider implementation to return the configuration database paths as required. Below is a simple example returning a hard-coded path.

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5.     Export the plug-in

a)     In the Package Explorer, right-click on the project and select Export

b)    Open the Plug-in Development group, select Deployable plug-ins and fragments and Click Next

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c)     Select a directory to export the plug-in in to

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d)    Click Finish


4.   Add the Configuration Database extension to DS-5

The final task is to add your Configuration Database extension to DS-5 by installing the plug-in into the existing installation.

There are several mechanisms available to install a plug-in into Eclipse, which one is most appropriate depends on the particular requirements of the provider.

·         Watched directories

Eclipse supports watched directories where a plug-in can be placed to be automatically installed when Eclipse is started. DS-5 provides two such directories:

·         Install for single user

The plug-in is placed in a user-specific configuration area, ~/.ds-5/workbench/dropins/plugins (Linux) or %APPDATA%/ARM/DS-5/workbench/dropins/plugins (Windows), and is installed for that user only.

·         Install for all users

The plug-in is placed in the main DS-5 configuration area, <DS-5 Root>/sw/eclipse/dropins/plugins, and will be available to all users.

There are two things to consider when installing plug-ins into the main DS-5 configuration area. Firstly, write permissions on the DS-5 installation are needed, which on Windows means Administrator rights are required to perform the install. Secondly, any files added to the DS-5 installation will not be removed if DS-5 is un-installed, it is the responsibility of the provider to manage the additional files.

·         Eclipse p2 director application

The p2 director application allows plug-ins to be installed into Eclipse in the same manner as plug-ins from the Software Updates dialog.

<DS-5 Root>/bin/eclipse –application org.eclipse.equinox.p2.director –nosplash   –consolelog –repository file:///work/export -installIU com.acme.configdb

The above command would install the provider plug-in into the user-specific configuration area, as DS-5 uses a cascaded configuration by default. To perform the same install for all users and install into the main configuration area, add the following options to the end of the command line:

–vmargs –Dosgi.configuration.cascaded=false

The considerations regarding permissions and un-installation discussed for the watched directories also apply to the p2 director installation.

The steps below show a simple example of using the DS-5 dropins directory, write permission to this directory is assumed.

1.     Drop the plug-in jar file from the export directory into the sw/eclipse/dropins/plugins directory relative to the root of your DS-5 installation.

2.     Start Eclipse for DS-5

3.     Select Window → Preferences

4.     Open the DS-5 group and select Configuration Database

5.     The contributed Configuration Database will be visible in the Default Configuration Databases table

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Copyright © 2013 ARM Limited. All rights reserved. ARM DAI0329B
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