infineon / mtb-example-usb-device-hid-generic

This example demonstrates how to configure the USB block as a Human Interface Device (HID). The device enumerates as a generic HID device.

emUSB Device: HID generic application

This code example demonstrates the usage of the emUSB device middleware stack to configure the USB block in a supported Infineon MCU as a generic Human Interface Device (HID). It takes help from an external HID software tool to send in the generic HID inputs which it then relays back.This example is currently supported on PSoC™ 6.

View this README on GitHub.

Provide feedback on this code example.

Requirements

• ModusToolbox™ software v3.0 or later (tested with v3.0)
• Board support package (BSP) minimum required version: 4.0.0
• Programming language: C
• Associated parts: All PSoC™ 6 MCU parts

Supported toolchains (make variable 'TOOLCHAIN')

• GNU Arm® Embedded Compiler v10.3.1 (GCC_ARM) - Default value of TOOLCHAIN
• Arm® Compiler v6.16 (ARM)
• IAR C/C++ Compiler v9.30.1 (IAR)

Supported kits (make variable 'TARGET')

• PSoC™ 6 Wi-Fi Bluetooth® prototyping kit (CY8CPROTO-062-4343W) – Default value of TARGET
• PSoC™ 6 Wi-Fi Bluetooth® pioneer kit (CY8CKIT-062-WIFI-BT)
• PSoC™ 62S2 Wi-Fi Bluetooth® pioneer kit (CY8CKIT-062S2-43012)
• PSoC™ 62S1 Wi-Fi Bluetooth® pioneer kit (CYW9P62S1-43438EVB-01)
• PSoC™ 62S1 Wi-Fi Bluetooth® pioneer kit (CYW9P62S1-43012EVB-01)
• PSoC™ 62S3 Wi-Fi Bluetooth® prototyping kit (CY8CPROTO-062S3-4343W)
• PSoC™ 62S4 pioneer kit (CY8CKIT-062S4)
• PSoC™ 62S2 evaluation kit (CY8CEVAL-062S2, CY8CEVAL-062S2-LAI-4373M2, CY8CEVAL-062S2-MUR-43439M2, CY8CEVAL-062S2-LAI-43439M2)

Hardware setup

This example uses the board's default configuration. See the kit user guide to ensure that the board is configured correctly.

Note: The PSoC™ 6 Bluetooth® LE pioneer kit (CY8CKIT-062-BLE) and the PSoC™ 6 Wi-Fi Bluetooth® pioneer kit (CY8CKIT-062-WIFI-BT) ship with KitProg2 installed. The ModusToolbox™ software requires KitProg3. Before using this code example, make sure that the board is upgraded to KitProg3. The tool and instructions are available in the Firmware Loader GitHub repository. If you do not upgrade, you will see an error like "unable to find CMSIS-DAP device" or "KitProg firmware is out of date".

Software setup

This example requires an external HID software tool to act as a generic HID host for the emUSB device.

Instructions in this document use the USB-HID tool to write and read data to/from a HID device.

Download the USB-HID tool GitHub project. You should see a /bin folder that contains the 'usbhidtool' executable available for different systems.

Install a terminal emulator if you don't have one. Instructions in this document use Tera Term.

Using the code example

Create the project and open it using one of the following:

In Eclipse IDE for ModusToolbox™ software

1. Click the New Application link in the Quick Panel (or, use File > New > ModusToolbox™ Application). This launches the Project Creator tool.

2. Pick a kit supported by the code example from the list shown in the Project Creator - Choose Board Support Package (BSP) dialog.

   When you select a supported kit, the example is reconfigured automatically to work with the kit. To work with a different supported kit later, use the Library Manager to choose the BSP for the supported kit. You can use the Library Manager to select or update the BSP and firmware libraries used in this application. To access the Library Manager, click the link from the Quick Panel.

   You can also just start the application creation process again and select a different kit.

   If you want to use the application for a kit not listed here, you may need to update the source files. If the kit does not have the required resources, the application may not work.

3. In the Project Creator - Select Application dialog, choose the example by enabling the checkbox.

4. (Optional) Change the suggested New Application Name.

5. The Application(s) Root Path defaults to the Eclipse workspace which is usually the desired location for the application. If you want to store the application in a different location, you can change the Application(s) Root Path value. Applications that share libraries should be in the same root path.

6. Click Create to complete the application creation process.

For more details, see the Eclipse IDE for ModusToolbox™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mt_ide_user_guide.pdf).

In command-line interface (CLI)

ModusToolbox™ software provides the Project Creator as both a GUI tool and the command line tool, "project-creator-cli". The CLI tool can be used to create applications from a CLI terminal or from within batch files or shell scripts. This tool is available in the {ModusToolbox™ software install directory}/tools_{version}/project-creator/ directory.

Use a CLI terminal to invoke the "project-creator-cli" tool. On Windows, use the command line "modus-shell" program provided in the ModusToolbox™ software installation instead of a standard Windows command-line application. This shell provides access to all ModusToolbox™ software tools. You can access it by typing modus-shell in the search box in the Windows menu. In Linux and macOS, you can use any terminal application.

The "project-creator-cli" tool has the following arguments:

Argument	Description	Required/optional
--board-id	Defined in the <id> field of the BSP manifest	Required
--app-id	Defined in the <id> field of the CE manifest	Required
--target-dir	Specify the directory in which the application is to be created if you prefer not to use the default current working directory	Optional
--user-app-name	Specify the name of the application if you prefer to have a name other than the example's default name	Optional

The following example clones the "mtb-example-usb-device-hid-generic" application with the desired name "USBHIDgeneric" configured for the CY8CPROTO-062-4343W BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id CY8CPROTO-062-4343W --app-id mtb-example-usb-device-hid-generic --user-app-name USBHIDgeneric --target-dir "C:/mtb_projects"

Note: The project-creator-cli tool uses the git clone and make getlibs commands to fetch the repository and import the required libraries. For details, see the "Project creator tools" section of the ModusToolbox™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mtb_user_guide.pdf).

To work with a different supported kit later, use the Library Manager to choose the BSP for the supported kit. You can invoke the Library Manager GUI tool from the terminal using make library-manager command or use the Library Manager CLI tool "library-manager-cli" to change the BSP.

The "library-manager-cli" tool has the following arguments:

Argument	Description	Required/optional
--add-bsp-name	Name of the BSP that should be added to the application	Required
--set-active-bsp	Name of the BSP that should be as active BSP for the application	Required
--add-bsp-version	Specify the version of the BSP that should be added to the application if you do not wish to use the latest from manifest	Optional
--add-bsp-location	Specify the location of the BSP (local/shared) if you prefer to add the BSP in a shared path	Optional

The following example adds the CY8CPROTO-062-4343W BSP to the already created application and makes it the active BSP for the app:

library-manager-cli --project "C:/mtb_projects/MyHelloWorld" --add-bsp-name CY8CPROTO-062-4343W --add-bsp-version "latest-v4.X" --add-bsp-location "local"

library-manager-cli --project "C:/mtb_projects/MyHelloWorld" --set-active-bsp APP_CY8CPROTO-062-4343W

In third-party IDEs

Use one of the following options:

• Use the standalone Project Creator tool:

  1. Launch Project Creator from the Windows Start menu or from {ModusToolbox™ software install directory}/tools_{version}/project-creator/project-creator.exe.

  2. In the initial Choose Board Support Package screen, select the BSP, and click Next.

  3. In the Select Application screen, select the appropriate IDE from the Target IDE drop-down menu.

  4. Click Create and follow the instructions printed in the bottom pane to import or open the exported project in the respective IDE.

• Use command-line interface (CLI):

  1. Follow the instructions from the In command-line interface (CLI) section to create the application.

  2. Export the application to a supported IDE using the make <ide> command.

  3. Follow the instructions displayed in the terminal to create or import the application as an IDE project.

For a list of supported IDEs and more details, see the "Exporting to IDEs" section of the ModusToolbox™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mtb_user_guide.pdf).

Operation

1. Connect the board to your PC using the provided USB cable through the KitProg3 USB connector.

2. Open a terminal program and select the KitProg3 COM port. Set the serial port parameters to 8N1 and 115200 baud.

3. Program the board using one of the following:

   Using Eclipse IDE for ModusToolbox™ software

   1. Select the application project in the Project Explorer.

   2. In the Quick Panel, scroll down, and click <Application Name> Program (KitProg3_MiniProg4).

   Using CLI

   From the terminal, execute the make program command to build and program the application using the default toolchain to the default target. The default toolchain is specified in the application's Makefile but you can override this value manually:

   make program TOOLCHAIN=<toolchain>
   

   Example:

   make program TOOLCHAIN=GCC_ARM
   

4. After programming, the application starts automatically. Confirm that "emUSB Device: HID generic application" is displayed on the UART terminal.

   Figure 1. Terminal output on program startup

   

5. The user LED blinks at 2 Hz to indicate that the board is ready to be configured and used as an emUSB HID device.

6. Connect the board to your PC from the PSoC™ 6 USB Device port (see the kit user guide for its location) via a micro USB cable.

7. The user LED stops blinking to indicate that the USB HID device has been detected successfully.

8. On the computer, open a terminal console and run the usbhidtool to send a few bytes. The tool requires as argument the VID, PID, number of bytes to send, and data. See the USB-HID tool documentation or use the following example:

   In Windows:

   usbhidtool.exe 0x058B 0x0274 4 0xDE 0xAD 0xBE 0xEF
   

   In Linux:

   ./usbhidtool 0x058B 0x0274 4 0xDE 0xAD 0xBE 0xEF
   

   After writing to the device, you should see the same data written back to the terminal console.

   de ad be ef 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
   

   Note: The usbhidtool always sends 64 bytes to the device, independent of how many bytes provided. Any remaining data is written with zeros.

Debugging

You can debug the example to step through the code. In the IDE, use the <Application Name> Debug (KitProg3_MiniProg4) configuration in the Quick Panel. For details, see the "Program and debug" section in the Eclipse IDE for ModusToolbox™ software user guide.

Note: (Only while debugging) On the CM4 CPU, some code in main() may execute before the debugger halts at the beginning of main(). This means that some code executes twice – once before the debugger stops execution, and again after the debugger resets the program counter to the beginning of main(). See KBA231071 to learn about this and for the workaround.

Design and implementation

This code example intends to provide the functionality of a generic Human Interface Device (HID) using the Segger emUSB device middleware library. The USB Implementers Forum has defined the Human Interface Device (HID) class as an abstract USB class protocol which was developed for handling devices that would be used directly by users use to control the operation of computer systems.

The firmware consists of a main() function and two separate application functions (usbd_hid_init() and usbd_hid_echo_task()) to implement the desired functionality. The main function is responsible for calling the relevant emUSB device middleware target APIs and application functions (USBD_Init()) respectively for the initialization of the emUSB device stack, and setting up the endpoint information for HID class. For more information regarding the usage of emUSB device Target APIs, see the emUSB Device user guide (locally available at <mtb_shared>/emusb-device//docs)

A report descriptor is a structure which is used to transmit the HID control data to and from an HID device. A report descriptor defines the format of a report and is composed of report items that define one or more top-level collections. Each collection defines one or more HID reports. Usages are a part of HID report descriptors which is used to indicate the vendor's suggested use for a specific control or a group of controls. The usage of an HID application is defined using a usage page ID.

This example uses the usage table for a generic USB device. See the USB Specification and the HID Usage Tables guide for detailed information about HID input, output, and feature reports.

The usbd_hid_init() application function utilizes usb_hid_generic_report to capture the generic HID description of the emUSB device and set up the USB device endpoint. The generic USB-HID report in usb_hid_generic_report is generated using the following documents and HID descriptor tool given by the USB Implementers Forum (USB-IF) on their website.

Name	Description
HID Spec Definition	Device Class Definition for Human Interface Devices (HID) Firmware Specification (5/27/2001), Version 1.11
HID Usage Tables	HID Usage Tables for Universal Serial Bus (USB) Version 1.3
HID Descriptor Tool	Generic HID Descriptor Tool by USB Implementers Forum

The firmware then configures the device information for enumeration using the USBD_SetDeviceInfo() target API. After the USB core configuration is done, the USBD_Start() target API is called, which initiates a hardware attach and updates the endpoint configuration. The usbd_hid_echo_task() application function is where the USB device waits to be configured. The user LED blinks at 2 Hz to signify the wait state.

When the USB cable is connected to the device, the host will start enumeration of the device and the device will function as a generic USB HID device which echoes the generic HID inputs to the terminal using the USBD_HID_Read() and USBD_HID_Write() target APIs to read and write the HID data respectively.

Resources and settings

Table 1. Application resources

Resource	Alias/object	Purpose
USB (HAL)	usb_0_obj	USB device block configured with generic HID descriptor
UART (HAL)	cy_retarget_io_uart_obj	UART HAL object used by Retarget-IO for Debug UART port
GPIO (HAL)	CYBSP_USER_LED	User LED

Related resources

Resources	Links
emUSB Device Reference	emUSB Device – USB Device stack for embedded applications
USB HID documentation	Device Class Definition for Human Interface Devices (HID) Firmware Specification – 5/27/2001, Version 1.11 HID Usage Tables for Universal Serial Bus (USB) Version 1.3 HID Descriptor Tool by the USB Implementers Forum
Application notes	AN228571 – Getting started with PSoC™ 6 MCU on ModusToolbox™ software AN215656 – PSoC™ 6 MCU: Dual-CPU system design
Code examples	Using ModusToolbox™ software on GitHub
Device documentation	PSoC™ 6 MCU datasheets PSoC™ 6 technical reference manuals
Development kits	Select your kits from the evaluation board finder.
Libraries on GitHub	mtb-pdl-cat1 – PSoC™ 6 peripheral driver library (PDL) mtb-hal-cat1 – Hardware abstraction layer (HAL) library retarget-io – Utility library to retarget STDIO messages to a UART port
Middleware on GitHub	psoc6-middleware – Links to all PSoC™ 6 MCU middleware
Tools	Eclipse IDE for ModusToolbox™ software – ModusToolbox™ software is a collection of easy-to-use software and tools enabling rapid development with Infineon MCUs, covering applications from embedded sense and control to wireless and cloud-connected systems using AIROC™ Wi-Fi and Bluetooth® connectivity devices.

Other resources

Infineon provides a wealth of data at www.infineon.com to help you select the right device, and quickly and effectively integrate it into your design.

For PSoC™ 6 MCU devices, see How to design with PSoC™ 6 MCU – KBA223067 in the Infineon Developer community.

Document history

Document title: CE236475 – emUSB Device: HID generic application

Version	Description of change
1.0.0	New code example
1.1.0	Added support for CY8CEVAL-062S2-LAI-43439M2

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