On Thu, Feb 17, 2005 at 09:33:52AM -0500, Dan Streetman wrote: > >> What about for a system where the hardware doesn't change but the software > >> is replaced? Either the software calibration would have to be stored and > >> re-used (for each system, if managing multiple systems), or software > >> calibration would need to be re-run... > > > >In that case the best option is to store the calibration in the > >touchscreen, but still use the raw coordinates and have the controlller > >report the recommended calibration to the OS. > > Well since the hardware calibration doesn't lose any resoltion, I > personally think just using the hardware calibration would be better and > easier... > > >> Do you agree that for integrated touch panels, it is better to use > >> hardware calibration, as no software calibration should be needed? > > > >"Should" is the correct word here. Often it is needed due to > >nonlinearities where multi-point calibration is required, and moreso for > >integrated touch panels, where you don't want to replace the whole thing > >just because the panel is not so perfect anymore after long time use. > > But the hardware we're talking about, the EXII-5000UC 3M touch panel, does > have 21-point linearization hardware calibration available.
No problem. One interface more or less ... it'd be nice if the EV_MSC interface was at least designed to be usable with other touchscreens that can do the calibration in mind. -- Vojtech Pavlik SuSE Labs, SuSE CR ------------------------------------------------------- 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
