About tslib in Android

This page is the memo record of how to porting the well-known library libts/tslib into android 9. And, use it's binary tool ts_calibrate to perform touch screen calibration and ts_test_mt to verify the effect after applying calibrated parameters.

| Based on AOSP Android 9.0.0 of Rockchip RK3399 SOC platform

build tslib with aosp

download open source tslib 1.20 and put it into /external/tslib

auto generate config.h in tslib folder

console:/ $ cd external/tslib/
console:/ $ ./autogen.sh
console:/ $ ./configure

apply patch to modify tslib Android.mk to avoid build break and print debug log.

console:/ $ cd external/tslib/
console:/ $ git am 0001-porting-tslib-into-android.patch

module build tslib with android

# cd aosp root directory and execute "set up environment" and "choose a target"

console:/ $ cd aosp_root
console:/ $ source build/envsetup.sh
console:/ $ lunch *product_name*-eng     (e.g. lunch aosp_arm64-eng or aosp_arm64-user)
console:/ $
console:/ $ # cd tslib folder to execute android module build command, mma
console:/ $ cd aosp_root/external/tslib
console:/ $ mma -j8

check output binary and library (build in system folder and package into system.img)

# enter aosp product out (echo $ANDROID_PRODUCT_OUT)

   console:/ $ cd out/target/product/*product_name*/

# check binary executable in system/bin/

   system/bin/ts_calibrate
   system/bin/ts_print
   system/bin/ts_print_mt
   system/bin/ts_print_raw
   system/bin/ts_test_mt
   system/bin/ts_uinput

# check library in system/lib/ and system/lib64/

   system/lib/libts.so
   system/lib/ts/plugins/pthres.so
   system/lib/ts/plugins/input.so
   system/lib/ts/plugins/iir.so
   system/lib/ts/plugins/lowpass.so
   system/lib/ts/plugins/debounce.so
   system/lib/ts/plugins/invert.so
   system/lib/ts/plugins/skip.so
   system/lib/ts/plugins/median.so
   system/lib/ts/plugins/dejitter.so
   system/lib/ts/plugins/linear.so

   system/lib64/libts.so
   system/lib64/ts/plugins
   system/lib64/ts/plugins/pthres.so
   system/lib64/ts/plugins/input.so
   system/lib64/ts/plugins/iir.so
   system/lib64/ts/plugins/lowpass.so
   system/lib64/ts/plugins/debounce.so
   system/lib64/ts/plugins/invert.so
   system/lib64/ts/plugins/skip.so
   system/lib64/ts/plugins/median.so
   system/lib64/ts/plugins/dejitter.so
   system/lib64/ts/plugins/linear.so

Setup environment variables and config file in device console

setup environment variables

tslib binary executable must be executed with the root permission, so use su to switch to root user.

console:/ $ adb sehll
console:/ $ su
console:/ # export TSLIB_TSDEVICE=/dev/input/event2               (depends on which your touch screen input device)
console:/ # export TSLIB_PLUGINDIR=/system/lib64/ts/plugins
console:/ # export TSLIB_CONSOLEDEVICE=none;
console:/ # export TSLIB_CALIBFILE=/data/pointercal
console:/ # export TSLIB_FBDEVICE=/dev/graphics/fb0

setup config file, ts.conf

console:/ $ adb remount
console:/ $ adb push ts.conf /system/etc/ts.conf

Run ts_calibrate

execute ts_calibrate to perform touch screen calibration, and it'll output calibration parameters(10 integers).

console:/ $ su
console:/ # ts_calibrate

debug log :

console:/ # tslib 1.20+ / libts ABI version 0 (0x000A02)
console:/ # Release-Date: [unreleased]
console:/ #  Host OS: Linux, trying to open /dev/input/event2
console:/ # Loading module input
console:/ # Loading module pthres (pmin=1)
console:/ # Loading module dejitter (delta=100)
console:/ # Loading module linear
console:/ # xres = 3840, yres = 2160
console:/ # tslib input device: vendor 0x2575 product 0x5130 version 0x110 on bus 0x3
console:/ # tslib: No pressure values. We fake it internally
console:/ # RAW---------------------> 1767 1682 255 1568969879.955893
console:/ # TS_READ_RAW----> x = 1767, y = 1682, pressure = 255
console:/ # RAW---------------------> 1768 1673 255 1568969880.87658
console:/ # TS_READ_RAW----> x = 1768, y = 1673, pressure = 255
console:/ # RAW---------------------> 0 0 0 1568969880.135795
console:/ # TS_READ_RAW----> x = 0, y = 0, pressure = 0
console:/ # Took 2 samples...
console:/ # Top left : X = 1767 Y = 1677
console:/ # RAW---------------------> 31728 2720 255 1568969881.12904
console:/ # TS_READ_RAW----> x = 31728, y = 2720, pressure = 255
console:/ # RAW---------------------> 31728 2718 255 1568969881.30787
console:/ # TS_READ_RAW----> x = 31728, y = 2718, pressure = 255
console:/ # RAW---------------------> 31728 2715 255 1568969881.38730
console:/ # TS_READ_RAW----> x = 31728, y = 2715, pressure = 255
console:/ # RAW---------------------> 31728 2713 255 1568969881.54795
console:/ # TS_READ_RAW----> x = 31728, y = 2713, pressure = 255
console:/ # RAW---------------------> 0 0 0 1568969881.183783
console:/ # TS_READ_RAW----> x = 0, y = 0, pressure = 0
console:/ # Took 4 samples...
console:/ # Top right : X = 31728 Y = 2716
console:/ # RAW---------------------> 0 32767 255 1568969882.28901
console:/ # TS_READ_RAW----> x = 0, y = 32767, pressure = 255
console:/ # RAW---------------------> 10 32725 255 1568969882.31765
console:/ # TS_READ_RAW----> x = 10, y = 32725, pressure = 255
console:/ # RAW---------------------> 21 32686 255 1568969882.38673
console:/ # TS_READ_RAW----> x = 21, y = 32686, pressure = 255
console:/ # RAW---------------------> 39 32640 255 1568969882.46664
console:/ # TS_READ_RAW----> x = 39, y = 32640, pressure = 255
console:/ # RAW---------------------> 55 32594 255 1568969882.54794
console:/ # TS_READ_RAW----> x = 55, y = 32594, pressure = 255
console:/ # RAW---------------------> 71 32551 255 1568969882.62797
console:/ # TS_READ_RAW----> x = 71, y = 32551, pressure = 255
console:/ # RAW---------------------> 78 32521 255 1568969882.70783
console:/ # TS_READ_RAW----> x = 78, y = 32521, pressure = 255
console:/ # RAW---------------------> 86 32496 255 1568969882.79786
console:/ # TS_READ_RAW----> x = 86, y = 32496, pressure = 255
console:/ # RAW---------------------> 92 32473 255 1568969882.87667
console:/ # TS_READ_RAW----> x = 92, y = 32473, pressure = 255
console:/ # RAW---------------------> 104 32443 255 1568969882.95787
console:/ # TS_READ_RAW----> x = 104, y = 32443, pressure = 255
console:/ # RAW---------------------> 110 32423 255 1568969882.103777
console:/ # TS_READ_RAW----> x = 110, y = 32423, pressure = 255
console:/ # RAW---------------------> 122 32395 255 1568969882.111786
console:/ # TS_READ_RAW----> x = 122, y = 32395, pressure = 255
console:/ # RAW---------------------> 133 32373 255 1568969882.119787
console:/ # TS_READ_RAW----> x = 133, y = 32373, pressure = 255
console:/ # RAW---------------------> 138 32361 255 1568969882.127776
console:/ # TS_READ_RAW----> x = 138, y = 32361, pressure = 255
console:/ # RAW---------------------> 138 32359 255 1568969882.135611
console:/ # TS_READ_RAW----> x = 138, y = 32359, pressure = 255
console:/ # RAW---------------------> 145 32359 255 1568969882.144611
console:/ # TS_READ_RAW----> x = 145, y = 32359, pressure = 255
console:/ # RAW---------------------> 147 32357 255 1568969882.152610
console:/ # TS_READ_RAW----> x = 147, y = 32357, pressure = 255
console:/ # RAW---------------------> 0 0 0 1568969882.199793
console:/ # TS_READ_RAW----> x = 0, y = 0, pressure = 0
console:/ # Took 17 samples...
console:/ # Bot right : X =   92 Y = 32473
console:/ # RAW---------------------> 30960 31442 255 1568969882.996890
console:/ # TS_READ_RAW----> x = 30960, y = 31442, pressure = 255
console:/ # RAW---------------------> 30960 31445 255 1568969883.102711
console:/ # TS_READ_RAW----> x = 30960, y = 31445, pressure = 255
console:/ # RAW---------------------> 0 0 0 1568969883.174794
console:/ # TS_READ_RAW----> x = 0, y = 0, pressure = 0
console:/ # Took 2 samples...
console:/ # Bot left : X = 30960 Y = 31443
console:/ # RAW---------------------> 14861 16720 255 1568969883.841796
console:/ # TS_READ_RAW----> x = 14861, y = 16720, pressure = 255
console:/ # RAW---------------------> 14861 16722 255 1568969883.930786
console:/ # TS_READ_RAW----> x = 14861, y = 16722, pressure = 255
console:/ # RAW---------------------> 14864 16727 255 1568969883.938793
console:/ # TS_READ_RAW----> x = 14864, y = 16727, pressure = 255
console:/ # RAW---------------------> 0 0 0 1568969883.986784
console:/ # TS_READ_RAW----> x = 0, y = 0, pressure = 0
console:/ # Took 3 samples...
console:/ # Center : X = 14861 Y = 16722
console:/ # 1873.324707 -0.001660 0.004294
console:/ # -95.465576 -0.000006 0.069125
console:/ # Calibration constants: 122770208 -108 281 -6256432 0 4530 65536

Run ts_test_mt

execute ts_test_mt to verify the accuracy of ts_calibrate output parameters.

console:/ $ su
console:/ # ts_test_mt

Calibration formula

TouchAffineTransformation

321// -- TouchAffineTransformation --
322void TouchAffineTransformation::applyTo(float& x, float& y) const {
323    float newX, newY;
324    newX = x * x_scale + y * x_ymix + x_offset;
325    newY = x * y_xmix + y * y_scale + y_offset;
326
327    x = newX;
328    y = newY;
329}
330

References

Official website : tslib.org, GitHub libts/tslib
小耕的隨手筆記: TSLIB on Android gingerbread
Android6.0移植tslib去实现电阻屏校准 - qq_42233843的博客 - CSDN博客
is not accessible for the namespace default - Google 搜尋

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README.md

README.md

About tslib in Android

build tslib with aosp

Setup environment variables and config file in device console

Run ts_calibrate

Run ts_test_mt

Calibration formula

References

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README.md

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README.md

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About tslib in Android

build tslib with aosp

Setup environment variables and config file in device console

Run ts_calibrate

Run ts_test_mt

Calibration formula

References