For more information, see Developing Drivers with WDF.įollow these steps to create a USB UMDF V2 driver by using the Visual Studio 2022 driver template. Developing Drivers with Windows Driver Foundation, written by Penny Orwick and Guy Smith.It contains the USB FX2 device and all the required hardware specifications to implement a client driver. If you're new to USB driver development, use the OSR USB FX2 learning kit to study USB samples included with the WDK. Use the specification to determine the functionality of the USB driver and the related design decisions. The specification describes device capabilities and the supported vendor commands. In most cases, you're provided with a USB device and its hardware specification. Get a USB device for which you'll write the client driver. For more information, see Setting Up User-Mode Debugging in Visual Studio. If you're using two computers, you must configure the host and target computers for user-mode debugging. You can get the latest version from the WDK or you can Download and Install Debugging Tools for Windows. Your host computer has the latest version of debugging tools for Windows. You can get the latest version of the WDK from How to Get the WDK. The kit includes headers, libraries, tools, documentation, and the debugging tools required to develop, build, and debug a USB client driver. Your host computer has the latest Windows Driver Kit (WDK) for Windows 11, version 22H2. Your host computer has Visual Studio 2022. This article assumes that you're using two computers for developing, debugging, and installing your user mode driver.īefore you begin, make sure that you meet the following requirements: Software requirements In some cases, where the host and target computers are running the same version of Windows, you can have just one computer running Windows 10 or a later version of Windows. The target computer has the user-mode driver that you want to debug and one of the debuggers. A target computer running the version of the operating system that you want to test your driver on, for example, Windows 11, version 22H2.The host computer is your development environment, where you write and debug your driver. A host computer running Windows 10 or a later version of the Windows operating system.Prerequisitesįor developing, debugging, and installing a user-mode driver, you need two computers: The template code defines driver, device, and queue callback classes.įor an explanation about the source code generated by the template, see Understanding the UMDF template code for USB client driver. Otherwise the framework proceeds with the default processing of the event. Whenever Windows notifies the framework about certain events, the framework invokes the client driver's callback, if one is available. This partnership gives the client driver the opportunity to respond to device or system-related events reported by the framework. After these classes are instantiated, the resulting callback objects are partnered with particular framework objects. This article refers to a client driver-defined class that implements framework interfaces as a callback class. Typically, the client driver implements several interfaces exposed by the framework. Certain framework objects expose interfaces that enable a client driver to interact with the framework.Ī UMDF-based client driver is implemented as an in-process COM server (DLL), and C++ is the preferred language for writing a client driver for a USB device. Framework objects perform complicated driver tasks and interact with Windows. The QueryInterface method enables the client driver to get interface pointers to other framework objects in the Windows Driver Frameworks (WDF) object model. The AddRef and Release methods manage the object's lifetime, so the client driver doesn't need to maintain the reference count. Every framework object must implement IUnknown and its methods, QueryInterface, AddRef, and Release, by default. UMDF (referred to as the framework in this article) is based on the component object model (COM). After building and installing the client driver, you'll view the client driver in Device Manager and view the driver output in a debugger. In this article, you'll use the User Mode Driver, USB (UMDF V2) template provided with Microsoft Visual Studio 2022 to write a user-mode driver framework (UMDF)-based client driver.
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