Engineer-to-Engineer Notea

EE-235

Technical notes on using Analog Devices DSPs, processors and development tools
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Or visit our on-line resources http://www.analog.com/ee-notes and http://www.analog.com/processors

An Introduction to Scripting in VisualDSP++®
Contributed by Jason Pound

Rev 1 – May 11, 2004

Introduction
VisualDSP++® 3.5 introduces a language-independent scripting host that utilizes the Microsoft®
ActiveX® script host framework. The scripting host permits the use of multiple scripting engines(languages) that conform to the Microsoft ActiveX script engine framework. Scripting is a powerful andflexible tool that you can use to extend and customize the built-in capabilities of the IDDE or to automate
repetitive tasks. It is ideal for non-interactive scripting needs such as accessing DSP resources(reading/writing memory or reading/writing registers), performing repetitive tasks (executing external
tools prior to or after a build completes, or setting registers and memory prior to loading a program), or
running full-blown regression tests. These are only a few examples of what can be done with scripting; thepossibilities are endless. This EE-Note outlines the components involved in scripting and explains how to
use the new scripting capabilities in the IDDE.

A Note About Tcl
Prior to the release of VisualDSP++ 3.5, Tcl (http://www.tcl.tk) was the default scripting language in the
IDDE. Since Tcl is not a true ActiveX script engine, Tcl has been deprecated with release 3.5 and will not
be covered in this EE-Note. Although most Tcl functionality has been maintained for backward
compatibility, no new functionality will be added to the Tcl library going forward.

Supported Languages
The following script languages are officially supported by Analog Devices:
VBScript

A scripting language developed by Microsoft, with syntax based on Visual Basic®. If you already know
Visual Basic or Visual Basic for Applications (VBA), VBScript will be very familiar.
JScript

A scripting language developed by Microsoft that implements the ECMAScript standard. It is a very
powerful interpreted scripting language that is object-based and loosely typed. This will be the mostfamiliar language to users that are comfortable with C/C++.

Copyright 2004, Analog Devices, Inc. All rights reserved. Analog Devices assumes no responsibility for customer product design or the use or application ofcustomers’ products or for any infringements of patents or rights of others which may result from Analog Devices assistance. All trademarks and logos are propertyof their respective holders. Information furnished by Analog Devices applications and development tools engineers is believed to be accurate and reliable, however
no responsibility is assumed by Analog Devices regarding technical accuracy and topicality of the content provided in Analog Devices’ Engineer-to-Engineer Notes.

aAlthough each scripting language has its own syntax, all the scripting languages access the same featuresin VisualDSP++. For example, calls to subroutines (methods with no return types) using VBScript do not
use parentheses, even though JScript does.

!

Although the IDDE permits the use of other scripting languages, Analog Devices TechnicalSupport does not support them at this time.

The benefits of using the new ActiveX script engines include:•

More language choices•

Better language support and documentation•

Shorter learning curve for users who are already familiar with a language•

Much more powerful API (Automation)•

Better performance and flexibility

VisualDSP++ Automation API
VisualDSP++ includes a unified programming interface, called the VisualDSP++ Automation API, which
provides all script languages with broad access to all of the capabilities of the IDDE in a languageindependent manner. Automation, formerly called OLE Automation, is a Microsoft COM-based
technology that allows an application to use the services provided by another application (VisualDSP++).
It makes the VisualDSP++ environment programmable by any application that understands Automation.
Since script languages (VBScript or JScript) support the COM interface, they may be used to access to the
Automation API.
When a language is selected as the current language in the Console tab of the IDDE’s Output window, an
instance of the VisualDSP++ application object is created. This object, called Idde, is used to easily accessthe VisualDSP++ Automation’s methods and properties. The use of this object is shown later in thisdocument. For detailed information about the Automation API, refer to the online Help, which can befound at <VisualDSP install>\help\VisualDSPAutomation.chm.

Detecting Installed Languages
By default, under Windows 2000 or later, everything you need for scripting is already installed on theoperating system. However, under Windows 98 and Windows NT, if VisualDSP++ does not automaticallydetect any languages, you may have to download Microsoft Windows Script 5.6 or upgrade to the latest version
of Internet Explorer, which installs the VBScript and JScript libraries necessary to use the scripting
capabilities. For further information, visit the following Microsoft site:
http://www.microsoft.com/scripting

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aGetting Familiar with Scripting
Open VisualDSP++ and click the Console tab of the Output window. To see the list of available
languages, right-click in the Output window and choose Languages. Choose VBScript to select it as thecurrent scripting language.

Figure 1. Language selection menu

The best way to become familiar with the scripting capabilities is to enter a few commands in the Output
window. Type the following lines:
a = 5
b = 2
c = a + b
? c
Listing 1. Simple commands!

Evaluate expressions by preceding the text with a question mark (?) when a Microsoft activeX
script engine is selected.

Now, let’s use the Idde object mentioned earlier to access some automation methods and properties. Typethe following commands in the Output window and observe the output for each command:? Idde.Name? Idde.ActiveSession.ActiveProcessor.Name? Idde.ActiveSession.ActiveProcessor.State
Idde.OutputWindow.PrintText “Hello World”, textTypeConsoleNormal
Idde.ActiveSession.ActiveProcessor.Run
Idde.ActiveSession.ActiveProcessor.Halt
Listing 2. Idde object commands

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aFigure 2. Output window with Idde object commands

Loading a Script
VisualDSP++ provides multiple ways to load a script:••••

Choose File->Load Script from the IDDE’s main menu
Choose File->Recent Scripts from the IDDE’s main menu
Choose Load Script from the Output window’s right-click menu
Choose Load Script via the right-click menu in an editor window

Following is an example. First, right-click in the Output window, and change the script language to JScript.
Open a new document in VisualDSP++ by clicking File->New on the main menu. Copy the following script
into the blank document. Save the file as LoadScriptEx.js to a directory of your choice. Once the file has
been saved, right-click on the LoadScriptEx.js file in the editor window and choose LoadScript. In the Output
window, type PrintSessionList() and press Enter. The list of sessions previously created in VisualDSP++
should print to the Output window (Figure 3).
function PrintSessionList(){
SessionList = Idde.SessionList;for( var i=0; i< SessionList.Count; i++ ){Session = SessionList.Item(i);Idde.OutputWindow.PrintText(Session.Name, 0);}}
Listing 3. PrintSessionList code

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aFigure 3. Output window with PrintSessionList output!

Code not contained within a function is considered global code and executes immediately after the
script is loaded. Code contained within a function is executed only when called within the global
code or when you type the function name into the Output window of the IDDE.

Automatically Invoking a Script
A script can automatically be loaded on startup of the IDDE by using the –f parameter and a shortcut tothe Idde.exe. This is ideal for recurring tasks.
To use this feature, create a shortcut to the Idde.exe. Right-click on the shortcut and choose Properties. Place“–f” and file name at the end of the Target field located on the Shortcut tab (Figure 4). Click OK. The nexttime the IDDE is started, the script will load automatically.

Figure 4. Specifying a script from the Shortcut tab

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aCreating a Toolbar Button
You can map a script to a toolbar button in the IDDE. For example, let’s use the PrintSessionList codefrom Listing 3 to create a toolbar button. First, create a tool by choosing Settings->Preferences and clicking
the Tools tab. Then click New to define the tool.

Figure 5. Tools tab of the Preferences dialog box

As shown in Figure 6, assign the new tool with the name Print Available Sessions and specify the function to
be executed, PrintSessionList(). Enter the directory where the script is located and select the Script command
option. Click OK to save the tool’s settings.

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aFigure 6. Specifying settings for the tool

Figure 7. PrintSessionList() tool

The final step is to enable the display of the User Tools toolbar. You do this via the Toolbars tab of thePreferences dialog box (Settings->Preferences). Select User Tools in the Toolbars list and then click OK to

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adisplay the toolbar in the IDDE. The User Tools toolbar is now available (Figure 9) and the Print
Available Settings command may be run by clicking the first tool.

Figure 8. Toolbars dialog

Figure 9. User Tools toolbar in the IDDE

MenuManger Object
Similar to the built-in Idde object, there is also a built-in MenuManager object. This object allows you to add
menu items to the IDDE’s menu and also allows you to modify the state of the menu items. The following

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a
is a simple example (in VBScript) that creates a menu (Figure 10) and declares an event to handle themenu click.

menuid = MenuManager.AddMenuTail( "&Tools:&My Menu Item", "This is a custom menu item." )Sub menumanager_OnMenuItemClicked(ByVal MenuID)
If (MenuID = menuid) Then
Idde.OutputWindow.PrintText "My Menu Item was clicked", tabConsole
End IfEnd Sub

Listing 4. Adding a menu item with the MenuManager object

Figure 10. Custom menu item

Debugging Scripts
The IDDE reports script errors to the Output window. The format of an error message is: File name, Line
number, Column number, Error reason, Error type. Double-clicking on an error line in the Output window
opens the script file and positions the cursor on the line where the error occurred. For example, let’s lookat the following script, which is located in a file named PrintSessionList.vbs:
Set SessionList = Idde.SessionList
For Each Session in SessionList
Idde.OutputWindow.PrintTText Session.Name, textTypeConsoleNormal
Next
Listing 5. Example script file containing an error

Since the line “Idde.OutputWindow.PrintTText Session.Name, textTypeConsoleNormal” contains
a syntax error, an error message would display in the Output window when the file is loaded. Once theextra “T” is removed, the script will proceed normally.

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aFigure 11. Error message output in the Output window

Enabling the Microsoft Script Debugger
If the Microsoft Script Debugger is already installed on the machine, the Enable Debugger command should
be available from the Output window’s right-click menu. If the debugger is not installed, the command
will be grayed out. To get a copy of the Microsoft Script Debugger, refer to the following Microsoft site:
http://www.microsoft.com/downloads and search for “Script Debugger”.
To enable the script debugger, right-click on the Output window and choose Enable Debugger. This will
activate the script debugger to launch when should a script error be encountered or when a command is
typed in the Output window.

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aFigure 12. Enable Debugger menu item

If the PrintSessionList.vbs script above is loaded while the script debugger is enabled, the debugger will
launch and stop on the line containing the error. With the Microsoft script debugger, you can step, run,
halt, set breakpoints, etc. Once you have finished debugging, the focus should return to the IDDE andshow the error message in the Output window.

Figure 13. Microsoft Script Debugger

To disable the script debugger, choose Enable Debugger from the Output window’s right-click menu again
and close the debugger.

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aAccessing VisualDSP++ from Another Application
VisualDSP++ can be controlled by another application such as a Visual Basic or C++ program. This
allows Automation aware applications to communicate and control VisualDSP++ and vice versa. As an
example application, a simple script could be written in Microsoft Excel that would connect to a target
board, load a program, set and run to a breakpoint, and then read a block of memory into Excel for data
analysis.
Excel can read
DSP memory through the
VisualDSP++ Automation
API

VisualDSP++ canalso talk to Excel’s
Automation API
Figure 14. Automation aware applications

The syntax of languages varies when creating an instance of VisualDSP++. The following is a sample ofsome of the languages and their methods used to create an instance of an object.
Language

SyntaxVBScript

Set app = CreateObject(“VisualDSP.ADspApplication”)

JScript

app = new ActiveXObject(“VisualDSP.ADspApplication”)

C++

IADspApplicationPtr pApp( "VisualDSP.ADspApplication" );Scripting Examples
The VisualDSP++ installation directory includes example scripts in the "Scripting Examples" folder
located under the DSP family name (e.g., Blackfin\Examples\Scripting Examples).

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aScripting References
VisualDSP++ Automation API
For detailed information about the Automation API, refer to the online Help, which can be found at<VisualDSP install>\help\VisualDSPAutomation.chm.
http://msdn.microsoft.com/scriptingThis is a good starting point for learning more about ActiveX scripting. The site includes in-depth
documents that describe the ActiveX technology and languages.
http://msdn.microsoft.com
This is a good starting point for in-depth knowledge on any Microsoft technology including ActiveX
scripting.
http://www.activestate.com
This site offers free, quality-assured language distributions such as perl and python.
news://msnews.microsoft.com/microsoft.public.inetsdk.programming.active_scrptng
This site covers general ActiveX scripting issues.
news://msnews.microsoft.com/microsoft.public.inetsdk.programming.scripting.vbscript
This site covers VBScript related issues.
news://msnews.microsoft.com/microsoft.public.inetsdk.programming.scripting.jscript
This site covers JScript related issues.

Conclusion
This EE-Note shows a fraction of what can be done with scripting. Scripting in VisualDSP++ is a
powerful tool that makes VisualDSP++ a more versatile application and provides users with infinite
possibilities.

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aAppendix A. Example: Project and IDDE Operations in VBScript
The following script example is simple but powerful. It creates a project, creates a file, adds the file to theproject, builds the project, loads the program, runs the program, retrieves the value of a variable within the
program, and then prints the value to the Output widow.
Change the script language to VBScript in the Output window. Open a new document in VisualDSP++ bychoosing File->New on the main menu. Copy the following script into the blank document and save it to a
directory of your choice as EE235ExA.vbs. Right-click on the file in the editor and choose Load Script. This
will start the script.

!

Exercise caution when using the Idde.Interactive property of the Automation API, as it will
suppress all dialog boxes including error messages, making script debugging potentially difficult.
If you use this property in a script, catch errors within the script and set this property back to True.

EE235ExA.vbs' Don't show any dialog boxes
Idde.Interactive = False' Create the project
Set Project = Idde.ProjectList.CreateProject( "EE235Ex", "EE235Ex.dpj" )' Set the project options
Project.Processor = Idde.ActiveSession.ActiveProcessor.Type
Project.TargetType = "DSP executable file"
Project.ActiveConfiguration = "Debug"' Create a new file system object.
Set FSO = CreateObject( "Scripting.FileSystemObject" )' Create the source file.
Set F = FSO.OpenTextFile( "EE235Ex.c", 2, True ) '2 = Writing' Write the data to the file.
F.Write( "int a, b, nValue;" & vbCrlf & "void main( void )" & vbCrlf & "{"& vbCrlf & vbTab & "a = 5;" & vbCrlf & vbTab & "b = 3;" & vbCrlf & vbTab & "nValue = a + b;" & vbCrlf & "}" & vbCrlf )' Close the file.
F.Close' Add the file to the project.
Project.AddFile "EE235Ex.c", "Source Files"' Build the project
Project.Build True
' Get the active processor
Set Processor = Idde.ActiveSession.ActiveProcessor' Load the program
Processor.LoadProgram Project.TargetFileNameList(0)An Introduction to Scripting in VisualDSP++® (EE-235)

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a' Run the program to the end of main
Processor.Run True
' Get the address of the variable
Address = Processor.MemoryTypeList.FindSymbol("nValue")(0).Address' Get the memory type
Set MemoryType = Processor.MemoryTypeList.Item(0)' Read the value of the variable
Set ValueList = MemoryType.GetMemory( Address, 1, 1 )' Print the value
Idde.OutputWindow.PrintText “The value = “ & ValueList(0).Value, 0' Show dialog boxes again
Idde.Interactive = True
If Err.Number <> 0 Then
' Show dialog boxes again
Idde.Interactive = True
Idde.OutputWindow.PrintText "An Error occurred.", 3
Err.Clear
End IfListing 1. EE235ExA.vbs

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aAppendix B. Example: Project and IDDE Operations in JScript
The following script example is simple but powerful. It creates a project, creates a file, adds the file to theproject, builds the project, loads the program, runs the program, retrieves the value of a variable within the
program, and then prints the value to the Output widow.
Change the script language to JScript in the Output window. Open a new document in VisualDSP++ bychoosing File->New on the main menu. Copy the following script into the blank document and save it to a
directory of your choice as EE235ExB.js. Right-click on the file in the editor and select Load Script. This will
start the script.
EE235ExB.js
try{// Don't show any dialog boxes
Idde.Interactive = false;// Create the project
Project = Idde.ProjectList.CreateProject( "EE235Ex", "EE235Ex.dpj" )// Set the project options
Project.Processor = Idde.ActiveSession.ActiveProcessor.Type;
Project.TargetType = "DSP executable file";
Project.ActiveConfiguration = "Debug";// Create a new file system object.
FSO = new ActiveXObject( "Scripting.FileSystemObject" );// Create the source file.
F = FSO.CreateTextFile( "EE235Ex.c", true ); //2 = Writing// Write the data to the file.
F.Write( "int a, b, nValue;" + "\n" + "void main( void )" + "\n" + "{" + "\n" +"\t" + "a = 5;" + "\n" + "\t" + "b = 3;" + "\n" + "\t" + " nValue = a + b;" +"\n" + "}" + "\n" );// Close the file.
F.Close();// Add the file to the project.
Project.AddFile( "EE235Ex.c", "Source Files" );// Build the project and wait
Project.Build( true );// Get the active processor
Processor = Idde.ActiveSession.ActiveProcessor;// Reset the processor and wait
Processor.Reset( true );// Load the program
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a// Run the program to the end of main
Processor.Run( true );// Get the address of the variable
Address = Processor.MemoryTypeList.FindSymbol("nValue")(0).Address;// Get the memory type
MemoryType = Processor.MemoryTypeList.Item(0);// Read the value of the variable
ValueList = MemoryType.GetMemory( Address, 1, 1 );// Print the value
Idde.OutputWindow.PrintText( "The value = " + ValueList(0).Value, 0 );// Close the project
Idde.ProjectList.RemoveProject( 0 );// Show dialog boxes again
Idde.Interactive = true;}
catch(e){// Show dialog boxes again
Idde.Interactive = true;
Idde.OutputWindow.PrintText( "An Error occurred: " + e.description, 3 );}Listing 2. EE235ExB.js

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aAppendix C. Example: Saving Projects and Dependencies in VBScript
The following script example illustrates how to load multiple projects and set dependencies on thoseprojects.
EE235ExC.vbs‘ get the project list
Set project_list = Idde.ProjectList‘ empty the project list first
While (project_list.Count > 0)project_list.RemoveProject 0
WEnd‘ add the projects
Set project1 = project_list.AddProject("sdram.dpj")
Set project2 = project_list.AddProject(".\CoreA\CoreA.dpj")
Set project3 = project_list.AddProject("..\CoreB\CoreB.dpj")
Set project4 = project_list.AddProject("..\L2\L2.dpj")
Set project5 = project_list.AddProject("..\L3\L3.dpj")‘ set the dependencies on the projects
Set dependencies = CreateObject( "VisualDSP.ADspStringList" )dependencies.Add project2.Namedependencies.Add project3.Namedependencies.Add project4.Namedependencies.Add project5.Name
project1.DependentProjectList = dependencies
Listing 3. EE235ExC.vbs

Document History
Revision

Description

Rev 1 – May 11, 2004
by J. Pound

Initial Release

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