On Mon, 18 Apr 2005, Mike Lee wrote: > for example zero.c, it use bcdUSB 0x200 but if you do not set > GADGET_DUALSPEED. it will not include the device_qualifier, this will > mislead the host to ask for a descriptor which the device do not know > and result in a protocol stall.
Like David Brownell said, it's perfectly legal for a USB 2.0 device not to have a Device Qualifier descriptor. You are correct that when the host asks for this nonexistent descriptor it will cause a protocol stall. Where's the problem with that? That's exactly what's supposed to happen. Alan Stern ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
