![]() 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. Starting in Windows 10, a Windows app can send requests to Usbser.sys by using the namespace. ![]() If you install Usbser.sys for the USB CDC device, here are the application programming model options: The property values are stored as little-endian 32-bit integers.įor more information, see Microsoft OS Descriptors.Äevelop Windows applications for a USB CDC device Add a custom property section that sets the bPropertyName field to a Unicode string, "IdleUsbSelectiveSuspendPolicy" and wPropertyNameLength to 62 bytes. Write an INF that references the install INF and add the registry entry in the HW.AddReg section.Äescribe the registry entry in an extended properties OS feature descriptor. That entry can be added in one of two ways: "0x00000000": Enters selective suspend only when there are no open handles to the device. "0x00000001": Enters selective suspend when idle, that is, when there are no active data transfers to or from the device. To configure power management features of Usbser.sys, you can set IdleUsbSelectiveSuspendPolicy to: The feature is disabled by default and can be enabled and configured by setting the IdleUsbSelectiveSuspendPolicy entry under this registry key: HKEY\_LOCAL\_MACHINE\\SYSTEM\\CurrentControlSet\\Enum\\USB\\\\\\Device ParametersWhen communication with the device resumes, the device can leave the suspend state and resume the working state. ![]() 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. Starting in Windows 10, Usbser.sys supports USB Selective Suspend. Configure selective suspend for Usbser.sys ĪddService=usbser, 0x00000000, LowerFilter_Service_Instįor more information, see How to use or reference the Usbser.sys driver from universal serial bus (USB) modem. for details, see System-Supplied Device Setup Classes. Under the Version section of the INF, specify the Modem and the device class GUID. The INF also needs to specify the device setup class as Modem to use mdmcpq.inf. That INF specifies "Usbser" as a lower filter driver in a device stack. 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. To load the driver, you need to write an INF that references the modem INF ( mdmcpq.inf) by using the Include directive. 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. With the new in-box INF, Usbser.sys is automatically loaded if a USB-to-serial device is detected on the mobile device. Unlike desktop editions, it is not possible to load a driver through an external driver package. On mobile editions of Windows, such as Windows 10 Mobile, only drivers that are part of the operating system are loaded. Microsoft encourages you to use in-box drivers whenever possible. For information about INF sections, see Overview of INF Files. For examples, look through the INF files included with sample drivers and find devices similar to your device.
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