Microsoft Usb Drivers Windows 10

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Aug 27, 2019 Reinstall the device driver In the search box on the taskbar, enter device manager, then select Device Manager. Right-click (or press and hold) the name of the device, and select Uninstall. This handy tool is tucked inside the Windows Driver Kit. Here’s a look at how you can use it to find out more about the USB ports in your system. How to track down USB devices in Windows 10.

This topic highlights the new features and improvements for Universal Serial Bus (USB) in Windows 10.

  • UCSI driver extensionStarting in Windows 10, version 1809, a new class extension for UCSI (UcmUcsiCx.sys) has been added,which implements the UCSI specification in a transport agnostic way. With minimal amount of code, your driver, which is a client to UcmUcsiCx, can communicate with the USB Type-C hardware over non-ACPI transport. This topic describes the services provided by the UCSI class extension and the expected behavior of the client driver.
  • USB Type-C Port Controller Interface
  • Windows 10 version 1703 provides a class extension (UcmTcpciCx.sys) that supports the Universal Serial Bus Type-C Port Controller Interface Specification. A USB Type-C connector driver does not need to maintain any internal PD/Type-C state.The complexity of managing the USB Type-C connector and USB Power Delivery (PD) state machines is handled by the system. You only need to write a client driver that communicates hardware events to the system through the class extension.
  • USB Dual Role support.
  • USB Dual Role controllers are now supported in Windows. Windows includes in-box client drivers for ChipIdea and Synopsys controllers. For other controllers, Microsoft provides a set of programming interfaces that allow the dual-role class extension (UrsCx) and its client driver to communicate with each other to handle the role-switching capability of a dual-role controller.
  • For more information about this feature, see:
  • New set of programming interfaces for developing a USB Type-C connector driver.
  • This version introduces native support for USB Type-C as defined in the USB 3.1 specification. The feature allows devices to use a reversible connector, a symmetric cable, faster charging, and Alternate Modes running over the USB cable. These programming interfaces allow you to write a driver for the connector (called the client driver in this section) that communicates with the Microsoft-provided class extension module: UcmCx to handle scenarios related to Type-C connectors such as, which ports support Type-C, which ports support power delivery.
  • New set of programming interfaces for developing an emulated host controller and a connected virtual device.
  • Windows 10 introduces support for emulated devices. Now you can develop an emulated Universal Serial Bus (USB) host controller driver and a connected virtual USB device. Both components are combined into a single KMDF driver that communicates with the Microsoft-provided USB device emulation class extension (UdeCx).
  • New set of programming interfaces for developing a USB host controller driver.
  • You can develop a host controller if your hardware is not xHCI specification-compliant or your are writing a virtual host controller, such as a controller that routes USB traffic over a TCP connection to the peripherals attached to a device. Your host controller driver is a client to the USB host controller extension, which is a system-supplied driver that follows the framework class extension model. Within the Microsoft USB 3.0 Driver Stack, UCX provides functionality to assist the host controller driver in managing a USB host controller device.
  • New set of programming interfaces for developing a USB function controller driver.
  • You can write a client driver that communicates with the USB function class extension (UFX) and implements controller-specific operations. UFX handles USB function logic that is common to all USB function controllers.
  • Improved experience for USB CDC (serial) devices.
  • Allows devices that are compliant with the USB communication devices Class (Class_02 & SubClass_02) to work with Windows 10 by using the Usbser.sys driver. Device manufacturers are no longer required to write a custom INF to install that driver.

Last updated

  • April, 2015

** OS version**

  • Windows 10
  • Windows 8.1

Microsoft Usb Drivers Windows 10 For Free

Applies to

  • Device manufacturers of CDC Control devices

Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.

In Windows 10, the driver has been rewritten by using the Kernel-Mode Driver Framework that improves the overall stability of the driver.

  • Improved PnP and power management by the driver (such as, handling surprise removal).
  • Added power management features such as USB Selective Suspend.

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In addition, UWP applications can now use the APIs provided by the new Windows.Devices.SerialCommunication namespace that allow apps to talk to these devices.

Usbser.sys installation

Load the Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.

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Note If you trying to install a USB device class driver included in Windows, you do not need to download the driver. They are installed automatically. If they are not installed automatically, contact the device manufacturer. For the list of USB device class driver included in Windows, see USB device class drivers included in Windows.

Windows 10

In Windows 10, a new INF, Usbser.inf, has been added to %Systemroot%Inf that loads Usbser.sys as the function device object (FDO) in the device stack. If your device belongs to the Communications and CDC Control device class, Usbser.sys is loaded automatically.You do not need to write your own INF to reference the driver. The driver is loaded based on a compatible ID match similar to other USB device class drivers included in Windows.

USBClass_02

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USBClass_02&SubClass_02

  • If you want to load Usbser.sys automatically, set the class code to 02 and subclass code to 02 in the Device Descriptor. For more information, see USB communications device class (or USB CDC) Specification found on the USB DWG website. With this approach, you are not required to distribute INF files for your device because the system uses Usbser.inf.
  • If your device specifies class code 02 but a subclass code value other than 02, Usbser.sys does not load automatically. Pnp Manager tries to find a driver. If a suitable driver is not found, the device might not have a driver loaded. In this case, you might have to load your own driver or write an INF that references another in-box driver.
  • If your device specifies class and subclass codes to 02, and you want to load another driver instead of Usbser.sys, you have to write an INF that specifies the hardware ID of the device and the driver to install. For examples, look through the INF files included with sample drivers and find devices similar to your device. For information about INF sections, see Overview of INF Files.

Note Microsoft encourages you to use in-box drivers whenever possible. On mobile editions of Windows, such as Windows 10 Mobile, only drivers that are part of the operating system are loaded. Unlike desktop editions, it is not possible to load a driver through an external driver package. With the new in-box INF, Usbser.sys is automatically loaded if a USB-to-serial device is detected on the mobile device.

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Windows 8.1 and earlier versions

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In Windows 8.1 and earlier versions of the operating system, Usbser.sys is not automatically loaded when a USB-to-serial device is attached to a computer. To load the driver, you need to write an INF that references the modem INF (mdmcpq.inf) by using the Include directive. The directive is required for instantiating the service, copying inbox binaries, and registering a device interface GUID that applications require to find the device and talk to it. That INF specifies ‘Usbser’ as a lower filter driver in a device stack.

The INF also needs to specify the device setup class as Modem to use mdmcpq.inf. Under the [Version] section of the INF, specify the Modem and the device class GUID. for details, see System-Supplied Device Setup Classes.

For more information, see this KB article.

Configure selective suspend for Usbser.sys

Starting in Windows 10, Usbser.sys supports USB Selective Suspend. It allows the attached USB-to-serial device to enter a low power state when not in use, while the system remains in the S0 state. When communication with the device resumes, the device can leave the Suspend state and resume Working state. The feature is disabled by default and can be enabled and configured by setting the IdleUsbSelectiveSuspendPolicy entry under this registry key:

HKEY_LOCAL_MACHINESYSTEMCurrentControlSetEnumUSB<hardware id><instance id>Device Parameters

To configure power management features of Usbser.sys, you can set IdleUsbSelectiveSuspendPolicy to:

  • ‘0x00000001’
  • Enters selective suspend when idle, that is, when there are no active data transfers to or from the device.
  • ‘0x00000000’
  • Enters selective suspend only when there are no open handles to the device.

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That entry can be added in one of two ways:

  • Write an INF that references the install INF and add the registry entry in the HW.AddReg section.
  • Describe the registry entry in an extended properties OS feature descriptor. Add a custom property section that sets the bPropertyName field to a Unicode string, ‘IdleUsbSelectiveSuspendPolicy’ and wPropertyNameLength to 62 bytes. Set the bPropertyData field to ‘0x00000001’ or ‘0x00000000’. The property values are stored as little-endian 32-bit integers.
  • For more information, see Microsoft OS Descriptors.

Develop Windows applications for a USB CDC device

If you install Usbser.sys for the USB CDC device, here are the application programming model options:

  • Starting in Windows 10, a Windows app can send requests to Usbser.sys by using the Windows.Devices.SerialCommunication namespace. It defines Windows Runtime classes that can use to communicate with a USB CDC device through a serial port or some abstraction of a serial port. The classes provide functionality to discover such serial device, read and write data, and control serial-specific properties for flow control, such as setting baud rate, signal states.
  • In Windows 8.1 and earlier versions, you can write a Windows desktop application that opens a virtual COM port and communicates with the device. For more information, see:
  • Win32 programming model:
  • .NET framework programming model:

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