Objective Development Forums

Hey!

we got 2 V-USB driven USB-Devices, a CDC device and a costum device.
Our aim is now to get these two devices to one single composite device, but we actually don't have a real idea how

What we found out by now:
- We need to modify the descriptors to multiple interfaces
- We need to change the event-handler so the Packet with the right ID gets to the right Interface.

Now we have 2 problems:
- with the descriptor setting based on #define's i have no idea how to change the descriptor. Is there a way to change the descriptor directly? (well, beneath changing the lib itself )

- the event-handler bases on USB_Poll, how do we get the right data to the right interface?

Maybe it should have been the first question, but is it possible using the V-USB library?
The Wiki doesn't even know the word "composite"

Any help will be appreciated,
Thanks,
Kai


*edit* and one more thing:
it is correct that combining them in a composite is the right way as we don't want to change ANYTHING on the drive for the costum device, is it?

You can replace every USB descriptor with your own version by defining USB_CFG_DESCR_PROPS_DEVICE, USB_CFG_DESCR_PROPS_CONFIGURATION and so on. You can supply your own version in flash memory or as return value from a function call.

Don't know whether you actually need a composite device, though. You can easily send your custom requests to a CDC (or whatever) class device and they will arrive in usbFunctionSetup(). Just make sure that your request IDs don't conflict with the class requests.