Tslib

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Revision as of 16:25, 27 July 2008 by JulienB (Talk | contribs) (Adding Tslib support to SDL)

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Library which provides a common interface to touchscreen and allows touchscreen events filtering or calibrating...

Compiling

Preliminaries checks

This part is normaly not required on following distribution: ??
This part is required on: Ubuntu 6.04, KUbuntu 6.10 or more

  • Be sure to have libtool package installed (tested with 1.5.22-4 & 1.5.24-1 versions).
    Otherwise you will have following errors:
configure.ac:25: error: possibly undefined macro: AC_DISABLE_STATIC
     If this token and others are legitimate, please use m4_pattern_allow.
     See the Autoconf documentation.
configure.ac:26: error: possibly undefined macro: AC_ENABLE_SHARED
configure.ac:27: error: possibly undefined macro: AC_LIBTOOL_DLOPEN
configure.ac:28: error: possibly undefined macro: AC_PROG_LIBTOOL
  • Be sure to have automake-1.6 or higher package installed (tested with 1.7 version -> working, 1.9.6 -> not working & 1.10 -> working !).
    After automake package installation don't forget to update your /etc/alternatives/automake and /etc/alternatives/aclocal symlinks (tested on Ubuntu).
$ sudo ln -sf /usr/bin/automake-1.7 /etc/alternatives/automake
$ sudo ln -sf /usr/bin/aclocal-1.7 /etc/alternatives/aclocal
 -->
lrwxrwxrwx 1 root root 20 2007-06-27 21:43 /etc/alternatives/aclocal -> /usr/bin/aclocal-1.7
lrwxrwxrwx 1 root root 21 2007-06-27 21:39 /etc/alternatives/automake -> /usr/bin/automake-1.7

This part is MANDATORY

  • In Buildroot, if you don't have configured the C++ cross-compiler yet (done in default configuration), then:
$ make menuconfig
Toolchain Options  --->
 [*] Build/install c++ compiler and libstdc++?
 [*] Build/install a shared libgcc?

Config

  • After all these checks, activate libts package in Buildroot configuration:
$ make menuconfig

Menuconfig package.png

Menuconfig package graphics.png

$ make
  • Or compile it directly:
$ make tslib

Configuration details (some are automatically done)

Config file

  • To work, Tslib needs a valid config file /etc/ts.conf:
# cat /etc/ts.conf

module_raw input
module pthres pmin=1
module variance delta=30
module dejitter delta=100
module linear

Envt variables

  • You should define some ENVT variables too:
export TSLIB_TSDEVICE=/dev/input/event0
export TSLIB_TSEVENTTYPE=INPUT
export TSLIB_CONFFILE=/etc/ts.conf
export TSLIB_CALIBFILE=/etc/pointercal

Device file

  • /dev/input/event0 is created from the infos got from:
# cat /sys/class/input/event0/dev
13:64
# mkdir /dev/input
# cd /dev/input/
# mknod event0 c 13 64
# ls -al
drwxr-xr-x    2 root     root            0 Jan  1 00:39 .
drwxr-xr-x    5 root     root            0 Jan  1 00:39 ..
crw-r--r--    1 root     root      13,  64 Jan  1 00:39 event0
#

Calibration

  • /etc/pointercal is created when running Tslib calibration tool:
# /usr/bin/ts_calibrate

Tslib calibrate.png

Testing it

# /usr/bin/ts_test

Tslib test.png

Adding Tslib support to SDL

SDL is by default compiled with Tslib support in current Buildroot distribution. You just have to make SDL knows the presence of Tslib when launching your application:

export SDL_MOUSEDRV=TSLIB
export SDL_MOUSEDEV=$TSLIB_TSDEVICE
export SDL_NOMOUSE=1

To have an example of a SDL application using Tslib, look at target/demos/backlight_control/ sources.

Adding Tslib support to Qt

Work in progress...

Links