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Chapter 3
3
3-1 MICROSOFT WINDOWS
Microsoft offers class drivers for some standard USB classes. These drivers can also be
called native drivers. A complete list of the native drivers can be found in the MSDN
online documentation on the page titled “Drivers for the Supported USB Device Classes”
( http://msdn.microsoft.com/en-us/library/ff538820(VS.85).aspx ). If a connected
device belongs to a class for which a native driver exists, Windows automatically loads
the driver without any additional actions from you. If a vendor-specific driver is required
for the device, a manufacturer’s INF file giving instructions to Windows for loading the
vendor-specific driver is required. In some cases, a manufacturer’s INF file may also be
required to load a native driver.
When the device has been recognized by Windows and is ready for communication, your
application may need to use a Globally Unique IDentifier (GUID) to retrieve a device
handle that allows your application to communicate with the device.
These sections explain the use of INF files and GUIDs. Table 3-1 shows the USB classes to
which the information in the following sub-sections applies.
Section
section 3-1-1 “About INF Files” on page 46
section 3-1-2 “Using GUIDs” on page 51
Micriμm classes
CDC, PHDC and Vendor
HID, PHDC and Vendor.
Table 3-1 Micriμm Classes Concerned by Windows USB Device Management
3-1-1 ABOUT INF FILES
An INF file is a setup information file that contains information used by Windows to install
software and drivers for one or more devices. The INF file also contains information to store
in the registry. Each of the drivers provided natively with the operating system has an
associated INF file stored in C:\WINDOWS\inf . For instance, when a HID or MSC device is
connected to the PC, Windows enumerates the device and implicitly finds an INF file
associated to a HID or MSC class that permits loading the proper driver. INF files for native
drivers are called system INF files. Any new INF files provided by manufacturers for vendor-
specific devices are copied into the folder C:\WINDOWS\inf . These INF files can be called
vendor-specific INF files. An INF file allows Windows to load one or more drivers for a
device. A driver can be native or provided by the device manufacturer.
46
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