the unique ID field means it is unique on the system. the underlying
composite parent device has a serial number, it will will have this field
set to true. it will not set it for each child b/c each child function does
not have its own system unique ID that the composite bus can generate
d
"rks" wrote in message
news:72c06f18-700d-4f53-889a-...
On Jun 21, 9:25 pm, Tim Roberts <> wrote:
> rks <> wrote:
>
> >Does anyone know how the DEVICE_CAPABILTIES.UniqueId is handled for
> >Usb composite devices and the individual device interfaces ?
>
> >We are observing that the uniqueId field is not being set in the
> >individual interface function devices - but only for the composite
> >device itself.
>
> Well, the interface ID's (eg, MI_01) are unique only within the composite
> device's "bus"...
>
> May I ask why this matters?
> --
> Tim Roberts,
> Providenza & Boekelheide, Inc.
It apparently matters to some third party software that makes use of
the uniqueId field to "uniquely" identify devices on the usb bus - and
fails with such composite device interfaces that dont have this
uniqueId bit set.
Thanks
Linear Mode
