On Fri, Apr 08, 2005 at 06:06:30PM -0700, Julian Elischer wrote: > Maksim Yevmenkin wrote: > >Bernd Walter wrote: > >>On Fri, Apr 08, 2005 at 06:12:33PM -0400, David Gilbert wrote: > >>Yes - you must use 1 - there is only one out-endpoint. 0x81 is for > >>receiving data and endpoint 0 is the mandandory control endpoint. > >>Interrupt Endpoints are not variable in size. Both interrupt > >>endpoints are 8 Bytes, so you must read and write exact 8 Bytes per > >>transfer - 5 shouldn't work for USB compliant devices. > > > > the device may accept 5 bytes of data. if it's feeling charitable. > but you probably should send teh number of bytes suggested by the > endpoint descriptor. > that number is at least guaranteed to work. Hang on.. I'm trying to > remember if the 8 includes the header..
The size is just the payload - I was just wrong, as interrupts transfers are allowed to be smaller. However the device should make use of 8 Byte packets or not say 8 Bytes at all. > if so then you probably only get 5 bytes of data space.. I need to go > back to my USB book. > > From what I saw before, you may need to set the configuration number > to 1 before it will do anything. > so you may need to do a setConfiguration(1) ugen will have done that already, otherwise it wouldn't know about the devnodes for the interrupt endpoints in the first configuration. -- B.Walter BWCT http://www.bwct.de [EMAIL PROTECTED] [EMAIL PROTECTED] _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
