WinUSB is a generic
USB
Universal Serial Bus (USB) is an industry standard, developed by USB Implementers Forum (USB-IF), for digital data transmission and power delivery between many types of electronics. It specifies the architecture, in particular the physical ...
driver provided by Microsoft for their
operating system
An operating system (OS) is system software that manages computer hardware and software resources, and provides common daemon (computing), services for computer programs.
Time-sharing operating systems scheduler (computing), schedule tasks for ...
s starting with
Windows Vista
Windows Vista is a major release of the Windows NT operating system developed by Microsoft. It was the direct successor to Windows XP, released five years earlier, which was then the longest time span between successive releases of Microsoft W ...
but which is also available for Windows XP. It is aimed at simple devices that are accessed by only one application at a time (for example instruments like weather stations, devices that only need a diagnostic connection or for firmware upgrades). It enables the application to directly access the device through a simple
software library
In computing, a library is a collection of resources that can be leveraged during software development to implement a computer program. Commonly, a library consists of executable code such as compiled functions and classes, or a library can ...
. The library provides access to the
pipes of the device. WinUSB exposes a client API that enables developers to work with USB devices from user-mode. Starting with Windows 7, USB
MTP devices use WinUSB instead of the kernel mode filter driver.
Advantages and disadvantages
Advantages
* Does not require the knowledge to write a driver
* Speeds up development
Disadvantages
* Only one application can access the device at a time
* Does not support
isochronous
A sequence of events is isochronous if the events occur regularly, or at equal time intervals. The term ''isochronous'' is used in several technical contexts, but usually refers to the primary subject maintaining a constant period or interval ( ...
transfers prior to Windows 8.1
* Does not support USB Reset (as requested by DFU protocol for example)
* On other operating systems, the device still needs a custom driver
WCID
A WCID device, where WCID stands for "Windows Compatible ID", is a USB device that provides extra information to a Windows system, in order to facilitate automated driver installation and, in most circumstances, allow immediate access. WCID allows a device to be used by a Windows application almost as soon as it is plugged in, as opposed to the usual scenario where a USB device that is neither HID nor Mass Storage requires end-users to perform a manual driver installation. As such, WCID can bring the 'Plug-and-Play' functionality of HID and Mass Storage to any USB device (that sports a WCID aware firmware). WCID is an extension of the WinUSB Device functionality.
Other solutions
One solution is the use of a predefined
USB device class. Operating systems provide built-in drivers for some of them. The most widely used device class for
embedded devices is the
USB communications device class (CDC). A CDC device can appear as a
virtual serial port to simplify the use of a new device for older applications.
Another solution is
/www.slideshare.net/YanVugenfirer/usb-dk-ataglance1 UsbDk UsbDk supports all device types including isochronous and provides simpler way for device access acquisition that does not involve
INF files creation and installation. UsbDk i
open source /github.com/daynix/UsbDk community supportedand works on all Windows versions starting from Windows XP.
If the previous solutions are inappropriate, one can write a custom driver. For newer versions of Microsoft Windows, it can be done using the
Windows Driver Foundation.
References
*
*
* The newest version can be found a
USB.org*
{{Microsoft Windows components
Windows components