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{{RASP-PiTFT-NAV}}
{{RASP-PiTFT-NAV}}
== Introduction ==
== Présentation ==
{{ADFImage|RASP-PiTFT-Soft-Touch-01.jpg|480px}}
{{ADFImage|RASP-PiTFT-01.jpg|480px}}
L'écran PiTFT est équipé d'un film résistif, ce qui permet de simuler le fonctionnement de la souris en touchant l'écran.
Il convient néanmoins d'installer le support logiciel nécessaire (pour bouger le pointeur de souris) et d'effectuer une calibration.
== Configurer la partie tactile ==
Now that the screen is working nicely, we'll take care of the touchscreen. There's just a bit of calibration to do, but it isn't hard at all.
Before we start, we'll make a '''udev''' rule for the touchscreen. That's because the '''eventX''' name of the device will change a lot and its annoying to figure out what its called depending on whether you have a keyboard or other mouse installed.
Run
<nowiki>sudo nano /etc/udev/rules.d/95-stmpe.rules</nowiki>
to create a new '''udev''' file and copy & paste the following line in:
<nowiki>SUBSYSTEM=="input", ATTRS{name}=="stmpe-ts", ENV{DEVNAME}=="*event*", SYMLINK+="input/touchscreen"</nowiki>
{{ADFImage|RASP-PiTFT-Soft-Touch-01.png|480px}}
Remove and re-install the touchscreen with
<nowiki>sudo rmmod stmpe_ts; sudo modprobe stmpe_ts</nowiki>
Then type '''ls -l /dev/input touchscreen'''
It should point to '''eventX''' where X is some number, that number will be different on different setups since other keyboards/mice/USB devices will take up an event slot
{{ADFImage|RASP-PiTFT-Soft-Touch-02.png|480px}}
There are some tools we can use to calibrate & debug the touchscreen. Install the "event test" and "touchscreen library" packages with
<nowiki>sudo apt-get install evtest tslib libts-bin</nowiki>
{{ADFImage|RASP-PiTFT-Soft-Touch-03.png|480px}}
Now you can use some tools such as sudo evtest '''/dev/input/touchscreen''' which will let you see touchscreen events in real time, press on the touchscreen to see the reports.
{{ADFImage|RASP-PiTFT-Soft-Touch-04a.png|480px}}
{{ADFImage|RASP-PiTFT-Soft-Touch-04b.png|480px}}
OK lets start the calibration process! You will want to calibrate the screen once but shouldn't have to do it more than that. We'll begin by calibrating on the command line by running
<nowiki>sudo TSLIB_FBDEVICE=/dev/fb1 TSLIB_TSDEVICE=/dev/input/touchscreen ts_calibrate</nowiki>
follow the directions on the screen, touching each point. Using a stylus is suggested so you get a precise touch. Don't use something metal, plastic only!
{{ADFImage|RASP-PiTFT-Soft-Touch-05a.png|480px}}
{{ADFImage|RASP-PiTFT-Soft-Touch-05b.png|480px}}
Next you can run sudo '''TSLIB_FBDEVICE=/dev/fb1 TSLIB_TSDEVICE=/dev/input/touchscreen ts_test''' which will let you draw-test the touch screen. Go back and re-calibrate if you feel the screen isn't precise enough!
{{ADFImage|RASP-PiTFT-Soft-Touch-06.png|480px}}
== Calibration X ==
You can also calibrate the X input system but you have to use a different program called '''xinput_calibrator'''
You can do this if the calibration on the screen isnt to your liking or any time you change the rotate=XX module settings for the screen. Since the screen and touch driver are completely separated, the touchscreen doesn't auto-rotate
Normally you'd have to compile it but we have a ready to go package for you so run:
<nowiki>wget http://adafruit-download.s3.amazonaws.com/xinput-calibrator_0.7.5-1_armhf.deb
sudo dpkg -i -B xinput-calibrator_0.7.5-1_armhf.deb</nowiki>
Before you start the xinput_calibrator you will need to delete the old calibration data so run
<nowiki>sudo rm /etc/X11/xorg.conf.d/99-calibration.conf</nowiki>
Before running '''startx''' and the calibrator - otherwise it gets really confused!
Now you'll have to run the xcalibrator while also running X. You can do this by startx and then opening up the terminal program and running the '''xinput_calibrator''' command OR you can do what we do which is run startx in a SSH/Terminal shell and then run the xinput_calibrator in the X window, which requires the following command order:
<nowiki>FRAMEBUFFER=/dev/fb1 startx &
DISPLAY=:0.0 xinput_calibrator</nowiki>
Follow the directions on screen
{{ADFImage|RASP-PiTFT-Soft-Touch-10.png|480px}}
Once complete you'll get something like:
{{ADFImage|RASP-PiTFT-Soft-Touch-11.png|480px}}
Run '''sudo nano /etc/X11/xorg.conf.d/99-calibration.conf''' and copy the
<nowiki>Section "InputClass"
Identifier "calibration"
MatchProduct "stmpe-ts"
Option "Calibration" "119 3736 3850 174"
Option "SwapAxes" "1"
EndSection</nowiki>
or whatever you got, into there. You can quit X if you want by typing '''fg''' to bring that command into the foreground, and then CONTROLE-C to quit.
Your touchscreen is now super calibrated, hurrah!
{{RASP-PiTFT-TRAILER}}
{{RASP-PiTFT-TRAILER}}