On Tue, 17 Jan 2006, Vojtech Pavlik wrote:

> > > How might I further debug or where do I look to see how this strange 
> > > packet size is
> > > affecting things?
> > 
> > It's not affecting anything.  (It works fine with 5-byte packets under
> > Windows, for instance.)  If the device were to send back a packet
> > containing more than 5 bytes you'd be in trouble.  As things stand,
> > however, it's not sending back anything at all.
> > 
> > On the whole, it's hard to say which is worse...  :-(
>  
> "babble" IMO means it's sending more than what it has been asked for,
> resulting in the URB coming back with an error instead of data.

That's correct.  Brian's usbmon logs show that the interrupt URB doesn't 
come back at all.  Not with data, and not with an error.  Which means the 
device is sending NAKs (i.e., no data available).

Also the USB-Snoopy logs from Windows show that the interrupt data being
sent back is indeed 5 bytes long.

Alan Stern



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