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- Windows 10
- Windows 8.1
- Device manufacturers of CDC Control devices
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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.
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.
Load the Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.
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.
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.
- 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. 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.
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.
Windows 8.1 and earlier versions
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:
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.
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:
For certain Universal Serial Bus (USB) devices, such as devices that are accessed by only a single application, you can install WinUSB (Winusb.sys) in the device's kernel-mode stack as the USB device's function driver instead of implementing a driver.
This topic contains these sections:
Automatic installation of WinUSB without an INF file
As an OEM or independent hardware vendor (IHV), you can build your device so that the Winusb.sys gets installed automatically on Windows 8 and later versions of the operating system. Such a device is called a WinUSB device and does not require you to write a custom INF file that references in-box Winusb.inf.
When you connect a WinUSB device, the system reads device information and loads Winusb.sys automatically.
For more information, see WinUSB Device.
Installing WinUSB by specifying the system-provided device class
When you connect your device, you might notice that Windows loads Winusb.sys automatically (if the IHV has defined the device as a WinUSB Device). Otherwise follow these instructions to load the driver:
- Plug in your device to the host system.
- Open Device Manager and locate the device.
- Select and hold (or right-click) the device and select Update driver software... from the context menu.
- In the wizard, select Browse my computer for driver software.
- Select Let me pick from a list of device drivers on my computer.
- From the list of device classes, select Universal Serial Bus devices.
- The wizard displays WinUsb Device. Select it to load the driver.
If Universal Serial Bus devices does not appear in the list of device classes, then you need to install the driver by using a custom INF.The preceding procedure does not add a device interface GUID for an app (UWP app or Windows desktop app) to access the device. You must add the GUID manually by following this procedure.
Load the driver as described in the preceding procedure.
Generate a device interface GUID for your device, by using a tool such as guidgen.exe.
Find the registry key for the device under this key:
Under the Device Parameters key, add a String registry entry named DeviceInterfaceGUID or a Multi-String entry named DeviceInterfaceGUIDs. Set the value to the GUID you generated in step 2.
Disconnect the device from the system and reconnect it to the same physical port.Note If you change the physical port then you must repeat steps 1 through 4.
Writing a custom INF for WinUSB installation
As part of the driver package, you provide an .inf file that installs Winusb.sys as the function driver for the USB device.
The following example .inf file shows WinUSB installation for most USB devices with some modifications, such as changing USB_Install in section names to an appropriate DDInstall value. You should also change the version, manufacturer, and model sections as necessary. For example, provide an appropriate manufacture's name, the name of your signed catalog file, the correct device class, and the vendor identifier (VID) and product identifier (PID) for the device.
Also notice that the setup class is set to 'USBDevice'. Vendors can use the 'USBDevice' setup class for devices that do not belong to another class and are not USB host controllers or hubs.
If you are installing WinUSB as the function driver for one of the functions in a USB composite device, you must provide the hardware ID that is associated with the function, in the INF. You can obtain the hardware ID for the function from the properties of the devnode in Device Manager. The hardware ID string format is 'USBVID_vvvv&PID_pppp'.
The following INF installs WinUSB as the OSR USB FX2 board's function driver on a x64-based system.
Starting in Windows 10, version 1709, the Windows Driver Kit provides InfVerif.exe that you can use to test a driver INF file to make sure there are no syntax issues and the INF file is universal. We recommened that you provide a universal INF. For more information, see Using a Universal INF File.
Only include a ClassInstall32 section in a device INF file to install a new custom device setup class. INF files for devices in an installed class, whether a system-supplied device setup class or a custom class, must not include a ClassInstall32 section.
Except for device-specific values and several issues that are noted in the following list, you can use these sections and directives to install WinUSB for any USB device. These list items describe the Includes and Directives in the preceding .inf file.
USB_Install: The Include and Needs directives in the USB_Install section are required for installing WinUSB. You should not modify these directives.
USB_Install.Services: The Include directive in the USB_Install.Services section includes the system-supplied .inf for WinUSB (WinUSB.inf). This .inf file is installed by the WinUSB co-installer if it isn't already on the target system. The Needs directive specifies the section within WinUSB.inf that contains information required to install Winusb.sys as the device's function driver. You should not modify these directives.Note Because Windows XP doesn't provide WinUSB.inf, the file must either be copied to Windows XP systems by the co-installer, or you should provide a separate decorated section for Windows XP.
USB_Install.HW: This section is the key in the .inf file. It specifies the device interface globally unique identifier (GUID) for your device. The AddReg directive sets the specified interface GUID in a standard registry value. When Winusb.sys is loaded as the device's function driver, it reads the registry value DeviceInterfaceGUIDs key and uses the specified GUID to represent the device interface. You should replace the GUID in this example with one that you create specifically for your device. If the protocols for the device change, create a new device interface GUID.
Note User-mode software must call SetupDiGetClassDevs to enumerate the registered device interfaces that are associated with one of the device interface classes specified under the DeviceInterfaceGUIDs key. SetupDiGetClassDevs returns the device handle for the device that the user-mode software must then pass to the WinUsb_Initialize routine to obtain a WinUSB handle for the device interface. For more info about these routines, see How to Access a USB Device by Using WinUSB Functions.
The following INF installs WinUSB as the OSR USB FX2 board's function driver on a x64-based system. The example shows INF with WDF coinstallers.
USB_Install.CoInstallers: This section, which includes the referenced AddReg and CopyFiles sections, contains data and instructions to install the WinUSB and KMDF co-installers and associate them with the device. Most USB devices can use these sections and directives without modification.
The x86-based and x64-based versions of Windows have separate co-installers.
Note Each co-installer has free and checked versions. Use the free version to install WinUSB on free builds of Windows, including all retail versions. Use the checked version (with the '_chk' suffix) to install WinUSB on checked builds of Windows.
Each time Winusb.sys loads, it registers a device interface that has the device interface classes that are specified in the registry under the DeviceInterfaceGUIDs key.
Note If you use the redistributable WinUSB package for Windows XP or Windows Server 2003, make sure that you don't uninstall WinUSB in your uninstall packages. Other USB devices might be using WinUSB, so its binaries must remain in the shared folder.
How to create a driver package that installs Winusb.sys
To use WinUSB as the device's function driver, you create a driver package. The driver package must contain these files:
- WinUSB co-installer (Winusbcoinstaller.dll)
- KMDF co-installer (WdfcoinstallerXXX.dll)
- An .inf file that installs Winusb.sys as the device's function driver. For more information, see Writing an .Inf File for WinUSB Installation.
- A signed catalog file for the package. This file is required to install WinUSB on x64 versions of Windows starting with Vista.
Note Make sure that the driver package contents meet these requirements:
- The KMDF and WinUSB co-installer files must be obtained from the same version of the Windows Driver Kit (WDK).
- The co-installer files must be obtained from the latest version of the WDK, so that the driver supports all the latest Windows releases.
- The contents of the driver package must be digitally signed with a Winqual release signature. For more info about how to create and test signed catalog files, see Kernel-Mode Code Signing Walkthrough on the Windows Dev Center - Hardware site.
Download the Windows Driver Kit (WDK) and install it.
Create a driver package folder on the machine that the USB device is connected to. For example, c:UsbDevice.
Copy the WinUSB co-installer (WinusbcoinstallerX.dll) from the WinDDKBuildNumberredistwinusb folder to the driver package folder.
The WinUSB co-installer (Winusbcoinstaller.dll) installs WinUSB on the target system, if necessary. The WDK includes three versions of the co-installer depending on the system architecture: x86-based, x64-based, and Itanium-based systems. They are all named WinusbcoinstallerX.dll and are located in the appropriate subdirectory in the WinDDKBuildNumberredistwinusb folder.
Copy the KMDF co-installer (WdfcoinstallerXXX.dll) from the WinDDKBuildNumberredistwdf folder to the driver package folder.
The KMDF co-installer (WdfcoinstallerXXX.dll) installs the correct version of KMDF on the target system, if necessary. The version of WinUSB co-installer must match the KMDF co-installer because KMDF-based client drivers, such as Winusb.sys, require the corresponding version of the KMDF framework to be installed properly on the system. For example, Winusbcoinstaller2.dll requires KMDF version 1.9, which is installed by Wdfcoinstaller01009.dll. The x86 and x64 versions of WdfcoinstallerXXX.dll are included with the WDK under the WinDDKBuildNumberredistwdf folder. The following table shows the WinUSB co-installer and the associated KMDF co-installer to use on the target system.
Use this table to determine the WinUSB co-installer and the associated KMDF co-installer.
WinUSB co-installer KMDF library version KMDF co-installer Winusbcoinstaller.dll Requires KMDF version 1.5 or later
Winusbcoinstaller2.dll Requires KMDF version 1.9 or later Wdfcoinstaller01009.dll Winusbcoinstaller2.dll Requires KMDF version 1.11 or later WdfCoInstaller01011.dll
Write an .inf file that installs Winusb.sys as the function driver for the USB device.
Create a signed catalog file for the package. This file is required to install WinUSB on x64 versions of Windows.
Attach the USB device to your computer.
Open Device Manager to install the driver. Follow the instructions on the Update Driver Software wizard and choose manual installation. You will need to provide the location of the driver package folder to complete the installation.
Ikanos Usb Devices Driver Download For Windows 7
WinUSB Architecture and Modules
Choosing a driver model for developing a USB client driver
How to Access a USB Device by Using WinUSB Functions
WinUSB Power Management
WinUSB Functions for Pipe Policy Modification