Question about USB composite device with CDC

Discussion in 'Windows Vista Drivers' started by GaryS, May 18, 2005.

  1. GaryS

    GaryS Guest

    After a bit of hunting around in the newsgroups I have seen posts inferring
    that there are problems with multi-function devices when one of the functions
    is CDC class. Is this true?
    We're working on a composite CDC (tentatively using usbser.sys) and mass
    storage device (using usbstor.sys). Can anyone add whether or not this has a
    chance of working, or do I need to bypass CDC and write a custom serial
    driver in order for the two functions to be handled correctly?
    GaryS, May 18, 2005
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  2. the problem is grouping. the generic parent driver would not konw to split
    out the 2 CDC interfaces as one child. usbser expects both interfaces to be

    Doron Holan [MS], May 20, 2005
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