hi David,
yes, I think you're right. I should probably make a
composite device where interface 0 is mass storage and
interface 1 is HID. Will this work fine on OSX?
can I still access the HID part without problems using
the HID IOkit examples available from apple's website?
it would be cool if I could find an example descriptor
for mass storage + hid but I don't have any devices
here to hook up to my usb analyzer...
bert
--- David Ferguson <email@hidden> wrote:
> Normally, you would have separate interfaces for
> different functions.
> For example, and Audio Class device has an Audio
> Control Interface
> that does thinks like setting the volume, switching
> outputs, etc (It
> also has an Audio Stream interface for
> sending/receiving audio
> streams). A Mass Storage interface could handle the
> file transfers
> directly.
>
> Perhaps your device want's both a HID and Mass
> Storage interface.
>
> David Ferguson
> USB Software Team
>
> At 3:25 AM -0700 10/18/05, bert wrote:
> >hi all,
> >
> >I already posted the message below to the mass
> storage
> >list but since it also falls into the category of
> USB
> >development I'm also posting it here.
> >
> >---
> >
> >I'm investigating whether to use HID or Mass
> storage
> >for my device hardware (audio player). Currently it
> is
> >a HID device but I need mass storage functionality
> to
> >transfer files to the memory of the device, so I'm
> >thinking of switching to that class.
> >
> >However, I still need to send device-specific
> commands
> >such as 'adjust volume'. How do I do this from an
> >application without writing drivers?
> >
> >thanks in advance,
> >
> >Bert
> >
> >
> >
> >
> >
> >
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