Custom HID device sample
Shows how to use the Windows.Devices.HumanInterfaceDevices API. Designed to work with a programmable, USB-based, HID device called the SuperMUTT.
Note: This sample is part of a large collection of UWP feature samples. You can download this sample as a standalone ZIP file from docs.microsoft.com, or you can download the entire collection as a single ZIP file, but be sure to unzip everything to access shared dependencies. For more info on working with the ZIP file, the samples collection, and GitHub, see Get the UWP samples from GitHub. For more samples, see the Samples portal on the Windows Dev Center.
You can use the sample to toggle an LED on the device by sending feature reports. You can also retrieve a feature report to determine the current LED blink pattern. In addition, you can use the sample to send output reports, receive input reports, and receive input-report interrupts.
If you are new to the HID protocol and concepts like: feature reports, input reports, and output reports, you can find more information here.
You can purchase a SuperMUTT device from JJG Technologies. (Note that you will need to update the device firmware before you can run the app.)
The sample demonstrates the following tasks:
- Enumerating available SuperMUTT devices.
- Connecting to a specific device.
- Issuing a feature report to retrieve, or set, the blink pattern on the device LED.
- Handling input-report events.
- Receiving an input report.
- Issuing an output report.
- Disconnecting from a specific device.
When the app is suspended, or the user removes the SuperMUTT, the sample explicitly closes the device. When the app is resumed, or the user reconnects the SuperMUTT, the sample re-opens the device.
Enumerating available SuperMUTT devices.
When you start the application and press the Start Device Watcher button, the app executes code that enumerates the available SuperMUTT devices.
Internally, the sample accomplishes this by retrieving a device selector and using this selector to create a device watcher (which looks for instances of the SuperMUTT device). The app retrieves a device selector by invoking the HidDevice.GetDeviceSelector method. This method returns an Advanced Query Syntax (AQS) string. The app then passes the AQS string to the DeviceInformation.CreateWatcher method.
Connecting to a SuperMUTT device.
When you click the corresponding device entry (identified by a string that contains the Vendor ID and Product ID) in the Select a HID Device list, the app establishes a connection to that specific device.
Issuing a feature report
When you choose the Feature Reports scenario the app displays a Get Led Blink Pattern and a Set Led Blink Pattern button.
To retrieve the current blink pattern, click the Get Led Blink Pattern button and view the current setting in the adjacent control. To set the current blink pattern, enter a value in the control and click the Set Led Blink Pattern button.
Handling input-report events
When you choose the Input Report Events scenario the app displays a Register For Event and an Unregister From Event button.
To receive input-report interrupts, click the Register For Event button and view the output under the Scenario pane. The app will display the cumulative number of events received as well as a count of bytes received in each event.
To halt the transmission of asynchronous events, press the Unregister From Event button.
Note that whenever the user leaves this scenario, the app will unregister the event.
Receiving an input report
When you choose the Input and Output Reports scenario the app displays two Get Input Report buttons. The first button lets you retrieve a numeric value issued by a device input report. The second button lets you retrieve a boolean value issued by a device input report.
Issuing an output report
When you choose the Input and Output Reports scenario the app displays two Get Output Report buttons. The first button lets you send a numeric value via an output report. The second button lets you send a boolean value via output report.
Disconnecting from a SuperMUTT device.
When you press the Stop Device Watcher button, the app executes code that disconnects from the SuperMUTT device.
Also, whenever the app is suspended, it executes code that disconnects from the SuperMUTT device.
Operating system requirements
Client: Windows 10
Server: Windows Server 2016 Technical Preview
Phone: Windows 10
Build the sample
- If you download the samples ZIP, be sure to unzip the entire archive, not just the folder with the sample you want to build.
- Start Microsoft Visual Studio and select File > Open > Project/Solution.
- Press Ctrl+Shift+B, or select Build > Build Solution.
Run the sample
To run this sample after building it, press F5 (run with debugging enabled) or Ctrl+F5 (run without debugging enabled) from Visual Studio. (Or select the corresponding options from the Debug menu.)
Device Driver Requirements
The sample runs over the inbox USB and HID device-drivers that ship in Windows. These device drivers are installed when you first attach the SuperMUTT device.
Note that the Windows.Devices.HumanInterfaceDevice API does not support custom, or filter, drivers.
Understanding the app manifest
The app manifest is an XML document that contains the info the system needs to deploy, display, or update an app. This info includes package identity, package dependencies, required capabilities, visual elements, and extensibility points. Every app package must include one package manifest.
An app that accesses a HID device must include specific DeviceCapability data in the Capabilities node of its manifest. This data identifies the device and its purpose (or function). Note that some devices may have multiple functions.
The Device Id element corresponds to the device identifier. This element may specify a combination Vendor Id (vid) and Product Id (pid); or, it may specify a generic string ("any"). In addition, the Device ID may contain an optional provider string of "usb" or "bluetooth".
The Function Type element specifies the device function. This element contains one or more HID usage values. These values consist of a Usage Page and an optional Usage Id, each of which are 16-bit hexadecimal values.
The sample DeviceCapabilities
In the following vendor-defined usage data, the device is identified by the Vendor Id and the Product Id combination.
<Capabilities> <!-- There are multiple ways declare a device --> <DeviceCapability Name="humaninterfacedevice"> <!--SuperMutt Device--> <Device Id="vidpid:045E 0610"> <Function Type="usage:FFAA 0001" /> </Device> </DeviceCapability> </Capabilities>
Configuring the SuperMUTT firmware
The following steps allow you to configure the SuperMUTT device to run with your sample.
Download and install the MUTT Software Package.
Open a command prompt and run the MuttUtil tool included in the package. Use this tool to update the firmware. (Note that you need to repeat the following command twice.)
Use the MuttUtil tool to set the HID device-mode.
Once you've tackled these steps, the SuperMUTT device is configured to work with the sample app.
If needed, the you can revert the SuperMUTT from HID device-mode back to its default configuration by running the following MuttUtil tool command.
Designed for Peripherals
This API is designed primarily for accessing peripheral devices. That said, you can use it to access PC internal devices. However, access to these devices is limited to a privileged app that is created by the OEM.
Not designed for Control Panel apps
This API is intended for Windows Runtime apps. Because there is no way for these apps to save settings outside of application scope you should not use it to write Control Panel apps.
Host Controller Limitations
The SuperMUTT device is compatible with EHCI host controllers. However, it does not currently support interrupts with XHCI host controllers.