Provided by: tsconf_1.0-12_all 
NAME
ts.conf - Configuration file for tslib, controlling touch screens for embedded devices.
DESCRIPTION
The idea of tslib is to have a core library that provides standardised services, and a set of plugins to
manage the conversion and filtering as needed.
The plugins for a particular touchscreen are loaded automatically by the library under the control of a
static configuration file, /etc/ts.conf. /etc/ts.conf gives the library basic configuration information.
Each line specifies one module, and the parameters for that module. The modules are loaded in order, with
the first one processing the touchscreen data first. For example:
module_raw input
module variance delta=30
module dejitter delta=100
module linear
MODULE PARAMETERS
variance
Tries to do it's best in order to filter out random noise coming from touchscreen ADC's. This is
achieved by limiting the sample movement speed to some value (e.g. the pen is not supposed to move
quicker than some threshold).
This is a 'greedy' filter, e.g. it gives less samples on output than receives on input.
• Parameters: delta.
Set the squared distance in touchscreen units between previous and current pen position (e.g.
(X2-X1)^2 + (Y2-Y1)^2). This defines the criteria for determining whenever two samples are 'near'
or 'far' to each other.
If the distance between previous and current sample is 'far', the sample is marked as 'potential
noise'. This doesn't mean yet that it will be discarded; if the next reading will be close to it,
this will be considered just a regular 'quick motion' event, and it will sneak to the next layer.
Also, if the sample after the 'potential noise' is 'far' from both previously discussed samples,
this is also considered a 'quick motion' event and the sample sneaks into the output stream.
dejitter
Removes jitter on the X and Y co-ordinates. This is achieved by applying a weighted smoothing filter.
The latest samples have most weight; earlier samples have less weight. This allows to achieve 1:1
input->output rate.
• Parameters: delta.
Squared distance between two samples ((X2-X1)^2 + (Y2-Y1)^2) that defines the 'quick motion'
threshold. If the pen moves quick, it is not feasible to smooth pen motion, besides quick motion
is not precise anyway; so if quick motion is detected the module just discards the backlog and
simply copies input to output.
linear
Linear scaling module, primarily used for conversion of touch screen co-ordinates to screen
co-ordinates.
• Parameters: xyswap.
Interchange the X and Y co-ordinates -- no longer used or needed if the new linear calibration
utility ts_calibrate is used.
ENVIRONMENT VARIABLES
Latest versions of the Xorg tslib input driver use hal to configure the touchscreen within Xorg.
Environment variables are only needed for the tslib commands.
TSLIB_TSDEVICE
If the default touchscreen device cannot be found, set the TSLIB_TSDEVICE environment variable to the
touchscreen device to use.
Default: /dev/input/event0
TSLIB_CONSOLEDEVICE
Tslib default console device.
Default: /dev/tty
TSLIB_CALIBFILE
Stores calibration data obtained using ts_calibrate.
Default: /etc/pointercal
TSLIB_CONFFILE
Set a different location for the ts.conf configuration file itself.
Default; /etc/ts.conf.
TSLIB_FBDEVICE
Framebuffer device to use for the touchscreen support.
Default: /dev/fb0.
TSLIB_PLUGINDIR
Plugin directory for tslib.
Default: /usr/lib/$triplet/ts0/ where triplet is the MultiArch path, e.g. arm-linux-gnueabi.
AUTHOR
This manual page was written by Neil Williams codehelp@debian.org for the Debian(TM) distribution because the original program does not have a manual page, but may be used by others. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 any later version published by the Free Software Foundation. On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.
AUTHOR
Russell King
Author.
COPYRIGHT
Copyright © 2008 Neil Williams