Date: Sat, 9 Apr 2005 06:01:18 +0200 From: Bernd Walter <ticso@cicely12.cicely.de> To: Julian Elischer <julian@elischer.org> Cc: David Gilbert <dgilbert@dclg.ca> Subject: Re: Tricky USB device. Message-ID: <20050409040118.GZ96690@cicely12.cicely.de> In-Reply-To: <42572A96.4090205@elischer.org> References: <16982.46075.115518.130213@canoe.dclg.ca> <4256B5EB.9080506@savvis.net> <16982.47024.135663.645297@canoe.dclg.ca> <20050408190514.GS96690@cicely12.cicely.de> <16983.465.572693.73195@canoe.dclg.ca> <20050408233301.GW96690@cicely12.cicely.de> <4257181F.1040904@savvis.net> <42572A96.4090205@elischer.org>
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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 bernd@bwct.de info@bwct.de
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