mirror of https://github.com/tLDP/LDP
139 lines
4.3 KiB
Plaintext
139 lines
4.3 KiB
Plaintext
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<!doctype linuxdoc system>
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<!-- LinuxDoc file was created by hand and emacs
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Fri Dec 10 17:45:29 GMT 1999 -->
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<article>
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<title>Linux Touch Screen HOWTO
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</title>
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<author>Christoph Baumann, cgb@debian.org
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</author>
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<date>Dec 10, 1999
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</date>
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<abstract>
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This document describes how to set up a touch screen input device under
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XFree86. As the author had only the opportunity to work with devices
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from EloTouch(R) and MicroTouch(R) this HOWTO is rather specific for these
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devices.
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</abstract>
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<toc>
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<sect>Which sort of devices are described here?
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<p>
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This HOWTO concentrates on devices connected via the serial port
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i.e. /dev/ttyS0 or /dev/ttyS1.
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</p>
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<sect>How to configure the device
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<p>
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Touch screen devices are configured in the Xinput section in the XF86Config
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file (mostly /etc/X11/XF86Config or /etc/XF86Config).
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At first verify that the device driver modules exist. They are located in
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/usr/X11R6/lib/modules/ (the modules for the above mentioned devices are
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xf86Elo.so and xf86MuTouch.so). Now have a look into XF86Config.
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There should be a section looking like this:
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</p>
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<p><verb>
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Section "Files"
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...
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ModulePath "/usr/X11R6/lib/modules"
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...
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EndSection
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</verb></p>
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<p>
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To get the module loaded by the X server there has to be a section like this:
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</p>
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<p><verb>
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Section "Module"
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Load "xf86Elo.so"
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EndSection
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</verb></p>
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<p>
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Now the more tricky part. X needs to know some parameters about the device.
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The section for this looks like this (see "man XF86Config" for more details):
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</p>
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<p><verb>
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Section "Xinput"
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SubSection "Elographics"
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#the entry for a MicroTouch device would be SubSection "MicrotouchFinger"
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Port "/dev/ttyS1" # for a device at serial port 2
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DeviceName "TouchScreen" #could be any unambiguous name
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MinimumXPosition 300
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MaximumXPosition 3700
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MinimumYPosition 300
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MaximumYPosition 3700
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UntouchDelay 10 #not supported with MuTouch
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ReportDelay 10 #not supported with MuTouch
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EndSubSection
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EndSection
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</verb></p>
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<p>
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The values for the entries MinimumXPosition etc. are of course specific
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for the setup of the hardware (i.e. depend on the position of the touch
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screen relative to the monitor). The values determine where the points (0,0)
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and (xmax,ymax) on your monitor (xmax and ymax depend on the resolution
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chosen for the Xserver, such as 1024x768) are mapped on the touch screen.
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The device driver reads these values and interpolishes the other coordinates.
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For illustration:
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</p>
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<p><verb>
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--------------touch screen area-----------------
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I I
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I ########visible monitor area############## I
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I #x # I
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I # (0,0) # I
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I # (MinimumXPosition,MinimumYPosition) # I
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I # # I
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I # # I
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I # # I
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I # # I
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I # # I
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I # # I
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I # # I
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I # (MaximumXPosition,MaximumYPosition)# I
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I # (xmax,ymax)# I
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I # x# I
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I ########################################## I
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I I
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------------------------------------------------
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</verb></p>
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<p>
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This mapping can be done by trial and error or by reading the raw output
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of the device (needs some serial port programming, see "The Linux Serial
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Programming HOWTO"). For the types EloTouch and MicroTouch exists a
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rudimentary calibration tool (written by the author of this document,
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it can be found at
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<url
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url="ftp://metalab.unc.edu/pub/linux/X11/xutils/touchcal-0.1.tar.gz"
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name="ftp://metalab.unc.edu/pub/linux/X11/xutils/touchcal-0.1.tar.gz">).
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</p>
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<sect>Activating the device
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<p>
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After starting X, type in an Xterminal the command
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<p><tt>xsetpointer <devicename></tt></p>
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<p>
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where<tt><devicename></tt> is the name defined in XF86Config
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with the line
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<tt>DeviceName "....."</tt>, in this example it would be TouchScreen.
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</p>
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<sect>Suggested reading
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<p>
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<itemize>
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<item>Manpage for XF86Config
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<item><url url="http://www.elotouch.com/linux.html" name="http://www.elotouch.com/linux.html">
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<item>The manual shipped with your touch screen :-)
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</itemize>
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</article>
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