USB driver demos?

Hi,
I picked up a Unipod at the Wakefield show, and I'm looking into the
possibility of writing a driver for the VLSI Vision (now STmicroelectronics)
CPiA webcam controller. Thing is, although the demo driver (the DRU-100 radio
controller) uses the parts of the API I'm interested in, I'm finding it a
little difficult getting to grips with some of the concepts behind it. There
also seems to be very little info on how the DRU-100 is actually controlled,
so it's a little difficult figuring out why the code is doing something (I
tend to try and follow data from the original buffer to the API function that
squirts the data down the USB line).

Does anyone know of any other open-source RISC OS USB device drivers
(preferably written in C) that I could take a look at? Anything would be
useful, especially if there was some documentation along the lines of
"Sending a bulk transfer to endpoint 2 with the data 0B EE FF makes the LED
turn on", so I can get some bearing on how the code actually works.

I'd also like to get my mitts on a StrongHelp manual that covers the Simtec
API, and/or a PDF version of the documentation on riscos-usb.org (multipage
HTML is just a bit of a pain to print off).

Thanks.
--
Phil. | Kitsune: Acorn RiscPC SA202 64M+6G VF+UniPod
philpem@xxxxxxxxxxxxx (valid!)| Cheetah: Athlon64 3200+ A8VDeluxeV2 1G+180G
http://www.philpem.me.uk/ | Tiger: Toshiba SatPro4600 Celeron700 256M+40G
No software patents! <http://www.eff.org/> / <http://www.ffii.org/>
.

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