On Fri, Feb 16, 2007 at 04:38:03PM -0500, Mazin wrote: > >Go ahead and post the protocol. > OK, here goes.
It looks fine - like what one would expect from a simple tablet. Can you add the USB descriptor listing from lsusb -vvv? > > The tablet sends its data in an 8-byte packet. > (Numbers in hex) > > A typical packet looks like: > 07 80 4f 00 4a 0b 00 00 > > The bytes, from left-to-right, are: > 1: ? Not sure, but from my testing it's always 07 > 2: The button codes for when buttons are pressed (there are two buttons > on the barrel of the pen): > 81 = Pen tip touch (translates to LMB) > 82 = Bottom side button (closest to pen tip) > 84 = Top side button (translates to RMB) > C0 = I'm not sure, but I think it might indicate when the pen is not > in the sensing range of the tablet. > 3: X-pos small increment (from 00 to FF) > 4: X-pos large increment (goes up to 0F). Each one of these is "worth" > 256, since byte three can only count to FF. > 5: Y-pos small increment (from 00-FF) > 6: Y-pos large increment (goes up to 0B). Works like the X-pos. > 7: Pen pressure (goes up to FF) > 8: Pressure large increment, "worth" 256. My tablet has 512 degrees of > pressure, so for 512, byte seven is FF and byte 8 is 01. On my tablet > it's either 00 or 01, but tablets with a greater pressure range may have > higher values. > > I'm not a USB expert, but I suspect that something special happens when > the tablet is first plugged in. For brevity's sake, I have the raw > sniffer data from when I first plug my tablet in on a computer with the > Windows driver installed. You can find it at > http://files.aztekera.com/apps/tabletinitialization.txt > > If this isn't enough I can provide more data, although I might not know > what to do with it. > > As always, thanks for any support, > Mazin > -- Vojtech Pavlik Director SuSE Labs ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
