From: Stephen F. <rob...@gm...> - 2012-03-06 18:33:17
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It is the LG screens. There is a bad board design and there seems to be around +-1V high frequency noise at the touch device controller on the chestnut boards according to my o-scope. I've given up for now, and am now banging my head on other gumstix things... On Tue, Mar 6, 2012 at 5:04 AM, Mark Zieg <mar...@oc...> wrote: > Hi Christian, > > Are the screens LG or Samsung? We experienced exactly what you describe > with LG, but the Samsung ones worked much better. > > Try adding the InvertY option to your > /usr/lib/X11/xorg.conf.d/05-evdev.conf: > > Section "InputClass" > Identifier "evdev touchscreen catchall" > MatchIsTouchscreen "on" > MatchDevicePath "/dev/input/event*" > Driver "evdev" > Option "InvertY" "true" > EndSection > > Calibrate your screen using a script like this (get ts_calibrate from > 'apt-get install tslib') > > $ cat scripts/calibrateScreen.sh > #!/bin/bash > EVENT=`ls /dev/input/ | grep event` > sudo TSLIB_TSDEVICE=/dev/input/$EVENT /usr/bin/ts_calibrate > > (I assume you've already done the "setenv defaultdisplay lcd43" bit.) > > Also, occasionally we find that the screens don't want to act as input > devices following a boot, so we bounce the driver using a script like this: > > $ cat scripts/bounceTouch.sh > #!/bin/bash > sudo modprobe -r ads7846 > sleep 1 > sudo modprobe ads7846 > > We've been reasonably happy with the screens after following these steps. > Not thrilled, but they get the job done. > > -MZ > > -----Original Message----- > From: Christian Ruocco [mailto:xri...@gm...] > Sent: Tuesday, March 06, 2012 3:01 AM > To: gum...@li... > Subject: Re: [Gumstix-users] LCD touch screen unusable on Overo/Chestnut > > I have this issue with all 10 of our Overo/Chestnut combos.. Erratic > touchscreen behavior and it also seems you have to press really hard on the > screen to get consistent samples, and then they're still not very > consistent. When I say really hard I mean substantially more than the light > brush needed to use an iPhone or the Verdex/ConsoleLCD16-vx for an example. > I have even put some debugging code in the driver to determine how > reliably the PENIRQ fires, and it is inconsistent, so I'm assuming this is > a hardware issue? There have been suggestions that it's somehow tied to the > LCD refresh rate. I have experimented with that and found that there is no > correlation for me at least. I have also used the prebuilt images on > Gumstix site to double check I haven't mangled something. I used the SD > image from > http://cumulus.gumstix.org/images/angstrom/factory/2011-08-30-1058/ and > using X-Windows on that exhibits the same problem. > > Any suggestions are welcome! > > Kind Regards, > Christian Ruocco > > -- > View this message in context: > http://gumstix.8.n6.nabble.com/LCD-touch-screen-unusable-on-Overo-Chestnut-tp561488p4550477.html > Sent from the Gumstix mailing list archive at Nabble.com. > > > ------------------------------------------------------------------------------ > Keep Your Developer Skills Current with LearnDevNow! > The most comprehensive online learning library for Microsoft developers is > just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro > Style Apps, more. Free future releases when you subscribe now! > http://p.sf.net/sfu/learndevnow-d2d > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > ******************************************************** > > The information transmitted is intended only for the person or entity to > which it is addressed and may contain confidential and/or privileged > material. If you are not the addressee, any disclosure, reproduction, > copying, distribution, or other dissemination or use of this communication > is > strictly prohibited. If you have received this transmission in > error please notify the sender immediately and then delete this e-mail. > E-mail transmission cannot be guaranteed to be secure or error free as > information could be intercepted, corrupted lost, destroyed, arrive late or > incomplete, or contain viruses. > The sender therefore does not accept liability for any errors or omissions > in the contents of this message which arise as a result of e-mail > transmission. If verification is required please request a hard copy > version. > > ******************************************************** > > > > ------------------------------------------------------------------------------ > Keep Your Developer Skills Current with LearnDevNow! > The most comprehensive online learning library for Microsoft developers > is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, > Metro Style Apps, more. Free future releases when you subscribe now! > http://p.sf.net/sfu/learndevnow-d2d > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |