Windows Vista Tips

Windows Vista Tips > Newsgroups > Windows Vista Drivers > USB: Differences regarding Composite Devices in Win2k and WinXP?

Thread Tools Display Modes

USB: Differences regarding Composite Devices in Win2k and WinXP?

Posts: n/a


My device implements USB CDC, which consists of two interfaces. That's why it
shows up as Composite Device in the Device Manager when plugging in.

The difference between Win2k and WinXP, as far as I found out, is that Win2k
only asks for 1 driver, where WinXP asks for two.

In the Win2k INF file I have no definition for the interfaces, and it works, i.e.:
%MyDevice.Descr% = MyDevice,USB\VID_1234&PID_4321

For WinXP it seems to be necessary to have a definition for each interface, i.e.:
%MyDevice.Descr% = MyDevice,USB\VID_1234&PID_4321&MI_00
%MyDevice.Descr% = MyDevice,USB\VID_1234&PID_4321&MI_01

With this in WinXP, two new COM port appear in the Device Manager, on seems to
be okay, the other has error code 10.
When I open the good COM port, no communication is possible. When I try it the
same way as under Win2k, no COM port appears.

So I come to my question: what's the difference between the two OS's that make
the same INF file work on Win2k but not on WinXP?

Many thanks for any hint.

Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
USB on Windows XP: Composite Devices and Selective Suspend Peter Fernandez Windows Vista Drivers 2 06-18-2008 11:39 AM
Video Capture Devices in MCE - Composite and Tuner?? Marathon Windows Media Center 5 12-16-2006 09:56 PM
Re: VGA to Composite or DVi to Composite Converter? Curious Windows Media Center 0 11-20-2004 01:38 AM
Why is Composite to Scart NOT the same as Scart to Composite? Gregory Windows Media Center 8 11-18-2004 02:08 AM
Win2K shows no Eject icon for composite device Keith Windows Vista Drivers 6 08-12-2004 08:56 PM