Microsoft Windows
3
Table 3-2 shows the Windows driver(s) loaded for each Micriμm class:
Micriμm class
CDC ACM
HID
Windows driver
usbser.sys
Hidclass.sys
Driver type
Native
Native
INF file type
Vendor-specific INF file
System INF file
Hidusb.sys
MSC
PHDC
Usbstor.sys
winusb.sys (for getting
Native
Native
System INF file
Vendor-specific INF file
started purpose only).
Vendor
winusb.sys
Native
Vendor-specific INF file
Table 3-2 Windows Drivers Loaded for each Micriμm Class
When a device is first connected, Windows searches for a match between the information
contained in system INF files and the information retrieved from device descriptors. If there
is no match, Windows asks you to provide an INF file for the connected device.
An INF file is arranged in sections whose names are surrounded by square brackets []. Each
section contains one or several entries. If the entry has a predefined keyword such as
“Class”, “Signature”, etc, the entry is called a directive. Listing 3-1 presents an example of an
INF file structure:
; =================== Version section =====================
[Version]
Signature = "$Windows NT$"
Class = Ports
ClassGuid = {4D36E978-E325-11CE-BFC1-08002BE10318}
Provider=%ProviderName%
DriverVer=01/01/2012,1.0.0.0
; ========== Manufacturer/Models sections =================
[Manufacturer]
%ProviderName% = DeviceList, NTx86, NTamd64
[DeviceList.NTx86]
(1)
(2)
(3)
%PROVIDER_CDC% = DriverInstall, USB\VID_fffe&PID_1234&MI_00
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