USB Configurator Guide


The USB Configurator is a stand-alone tool included with the ModusToolbox software to configure USB Device descriptors. See the Supported Descriptors section for a list of supported USB descriptors. After configuring and saving a USB Device descriptor, the USB Configurator generates configuration files that store USB Device descriptors and other information (see Code Generation) used by the USB Device middleware configuration and operation.


Supported Middleware



Cypress PSoC 6 USB Device Middleware Library

Launch the USB Configurator

You can launch the USB Configurator various ways: as a stand-alone tool, from the Eclipse IDE for ModusToolbox or from the command line.

The USB Configurator GUI contains menus, toolbars, and two panes used to configure device descriptors. The command line tool has various options.

As a Stand-Alone Tool

You can launch the USB Configurator as a stand-alone tool without the Eclipse IDE. By default, it is installed here:


On Windows, launch the tool from the Start menu.

For other operating systems, navigate to the install location and run the executable.

When opened this way, the USB Configurator opens with an untitled configuration file (*.cyusbdev). Save it as a new file and provide a file name, or open another existing *.cyusbdev file.

From the Eclipse IDE

If there is a *.cyusbdev file in the application folder, you can launch the USB Configurator GUI directly from the

Eclipse IDE using any of the following methods:

  • Double-click on the *.cyusbdev file in the application.

  • Right-click on the top-level application folder, and select ModusToolbox > USB Configurator.

  • Click on the “USB Configurator” link in the Quick Panel, under Configurators.

If there is no *.cyusbdev file in the application folder, the options from the menu and Quick Panel read USB Configurator (new configuration). Select either option, and the USB Configurator opens with a default configuration (*.cyusbdev) that will be saved to the design.cyusbdev file in the application folder.

From the Command Line

You can run the usbdev-configurator executable from the command line. There is also a usbdev-configurator-cli executable, which re-generates the source code based on the latest configuration settings from a command-line prompt or from within batch files or shell scripts. The exit code for the usbdev-configurator-cli executable is zero if the operation is successful, or non-zero if the operation encounters an error. To use the usbdev-configurator-cli executable, you must provide at least the –config argument with a path to the configuration file.

For more information about the command-line options, run the usbdev-configurator or usbdev-configurator-cli executable using the -h option.

Quick Start

This section provides a simple workflow for how to use the USB Configurator.

  1. Launch the USB Configurator.

  2. Configure the device descriptors hierarchy in the Device Descriptor pane. See the Descriptors section.


  1. Configure device descriptor parameters in the Parameter pane.


  1. The Parameter pane contains a sub-pane for HID descriptor (HID report pane).


  1. Save the configuration.

    See Code Generation.

  2. Use the generated structures as input parameters for functions in your application.

Code Generation

The USB Configurator generates header (.h) and source (.c) files that contain relevant firmware used by the USB Device middleware configuration and operation. The firmware contains arrays to store USB Device descriptors, structures that help the middleware to access descriptors, middleware and classes configuration structures, and a set of defines. The generated files cycfg_usbdev.h and cycfg_usbdev.c are located in the GeneratedSource folder next to the *. cyusbdev file.

Refer to the USB Device Middleware Library for more information about this code.

GUI Description


Descriptor Toolbar

Provides basic commands to open and save files and to configure the descriptors hierarchy.


  • Add descriptor – Adds a new sub-descriptor or Device descriptor.

  • Delete descriptor – Deletes the selected descriptor.

  • New – See Menus.

  • Open (Ctrl+O) – See Menus.

  • Save (Ctrl+S) – See Menus.

  • Undo – See Menus.

  • Redo – See Menus.

  • Load Descriptor – See Menus.

  • Save Descriptor – See Menus.

  • Import Descriptor – Selects a descriptor from the pull-down menu to import.

  • Expand all tree items – Expands all items in the descriptor tree.

  • Collapse all tree items – Collapses all items in the descriptor tree.

  • Move Up – Moves up the selected descriptor.

  • Move Down – Moves down the selected descriptor.

HID Report Toolbar

Provides the commands to configure an HID descriptor report.


  • Add HID report item – Creates a new HID report item for the current HID Descriptor.

  • Delete HID report item – Deletes the selected HID report item for the current HID Descriptor.

  • Load HID report – Loads an HID report file generated by the current HID Descriptor.

  • Import HID report – Imports an HID report item for the current HID Descriptor.

  • Move up HID report item – Moves up an HID report item.

  • Move down HID report item – Moves down an HID report item.


The USB Configurator contains two panes that display information about descriptors and their parameters:


This pane shows the descriptors hierarchy.


All descriptors have their own hierarchy that can be created when their parent is selected. However, the Device Descriptor is a root descriptor and it has no parent. The Device Descriptor can be created from any descriptor and will be added to the end of the tree.

To add specific descriptors such as CDC Interface Descriptor or HID Descriptor, add a special parent descriptor:

  • Add CDC Interface Descriptor for CDC Descriptor

  • Add HID Alternate Settings for HID Descriptor.


This pane shows configuration information for the selected descriptor.


The Parameter pane has different controls to edit different parameters (text box, combo box, or multi-line text box). Most parameters have a text box as the editing control.

  • Vendor-defined items – Some string parameters or HID report items, such as iSerialNumber, have a combo box with a list of predefined items. The “Empty” value is selected by default. To specify a value not on the list, select “Vendor-defined.” The combo box will change to a text box to type an appropriate value. To return to the combo box, erase the value and leave the control.

  • String pool – Parameters such as iChannelNames in AC Processing Unit of Audio Interface Descriptor 1.0 support a string pool and require a multi-line text box. To insert several strings, use an end-line separator.

  • Read-only parameters – There are two types of read-only parameters: predefined bDescriptorType or auto-calculated bConfigurationValue.

  • Array parameters – Parameters such as bSubordinateInterface in union with Communication Alternate Settings is an array. Use “;” to separate elements.

  • Hexadecimal/Decimal – When a value starts with “0x,” it is parsed as a hexadecimal value. In other cases, it is parsed as a decimal.

  • Map and bit fields – Some parameters, such as bmAttributes, are read-only by themselves. However, you can insert them using the related bit fields below them in the parameters list. Bit fields have a size of 0B. Their name starts with the name of a field whose part, plus the bits for which they are responsible. For example, bmAttributes(1-0): Transfer Type.


The USB Configurator has a validation system that can identify errors with icons and an error message in a tooltip, as well as in Notice List.


When you try to save the configuration with errors, a message shows the problem to fix.


Supported Descriptors

All supported descriptors are described by USB Implementers Forum, Inc. You can find more details at

The list of supported descriptors:

  • Device, Configuration, IAD (Interface Association Descriptor), Interface, Endpoint

  • Audio v1.0 and v2.0 descriptors

  • CDC Communication descriptors:

    • Header Functional descriptor

    • Union Functional descriptor

    • Country Selection Functional descriptor

    • Call Management Functional descriptor (PSTN)

    •  Abstract Control Management Functional descriptor (PSTN). HID descriptor and

  • HID Report descriptor

  • BOS descriptors (including Container ID and USB 2.0 Extension descriptors)

  • Microsoft OS descriptors v1.0


An Interface Descriptor is represented by two items to build a tree structure: Interface Descriptor with an empty parameters pane and Alternate Settings with all Interface Descriptor parameters.


Class-Specific AS Encoder/Decoder Descriptors from USB Audio v2.0 are not supported.

Known Issues, Limitations, and Workarounds

The USB Configurator supports import from the HID Descriptor Tool. Current version 2.4 contains an error related to strings. Per spec HID1.11 String items should have such values:

  • String Index 0111 10 nn

  • String Minimum 1000 10 nn

  • String Maximum 1001 10 nn

But the HID Descriptor Tool generates:

  • String Index 0110 10 nn

  • String Minimum 0111 10 nn

  • String Maximum 1000 10 nn

Before importing, fix these items manually in the file generated with the HID Descriptor tool.

There are several possible flows to run the USB Configurator. To migrate configurations between flows, you must regenerate code for each flow.

Migration of Configuration File Format

Versions of the USB Configurator prior to 2.0 used a C header file to store its configuration as a comment in XML format. In version 2.0, the configuration is stored in a separate .cyusbdev file in XML format. Use the following instructions to migrate to the .cyusbdev file as appropriate:

  1. Launch the USB Configurator.

  2. Click Open.

  3. Select the Obsolete configurator files (*.h) file extension and choose a header file.

  4. After the configuration is loaded, click Save to create the .cyusbdev file and update the C file.


  • The *.cyusbdev file is located one directory up related to the header file.

  • The command-line argument –config does not accept obsolete configuration files (*.h).


Refer to the following documents for more information, as needed:

Version Changes

This section lists and describes the changes for each version of this tool.


Change Descriptions


New tool.


Updated the icons to be standard.

Added Notice List.


Changed the user configuration storage location from the header file to the *.cyusbdev file.

Added New, Save As, Reset View commands. Changed the Load command to Open.

Updated the icons.

Removed the CUSTOM item from HID Report.

Removed the functionality to launch the USB Configurator from the Device Configurator.


Added the Undo/Redo feature.


Updated versioning to support patches.

Added Copy feature to the Notice List.

Added the calculation of the Endpoint Address for a new Endpoint Number.


Removed the command-line generate options: -g and –generate.