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#1 06-08-2018 11:34:38


[Tutorial] Two finger touch for right click on Raspbian (2018 update)

Credit goes to @gadgetoid for finding the method, testing it, and confirming that it works in this thread. … 2&start=25 I'm just adding some polish.

Tested with a Raspbian fresh install, 2018-06-27-raspbian-stretch and the 3rd prototype of Diskio Pi with ILITEK Multi-Touch-V3000 touch screen (13'3 capacitive)

It should work with other brands with some little modifications.

1) install twofing

mkdir ~/temp
cd ~/temp

That should report that "twofing-0.1.2.tar.gz" was saved.

Now we'll add some needed packages, if any of these are already installed it's OK. We'll update first, and then install them with the following commands.

sudo apt-get update
sudo apt-get install build-essential libx11-dev libxtst-dev libxi-dev x11proto-randr-dev libxrandr-dev

Now that those are in place we can extract the downloaded file and compile the binary using "make".

tar -xvzf twofing-0.1.2.tar.gz
cd twofing-0.1.2

Now copy "twofing" to /usr/bin

sudo cp twofing /usr/bin/

2) Next we need to create a .rules file in "/etc/udev/rules.d"

sudo nano /etc/udev/rules.d/70-touchscreen-ilitek.rules

SUBSYSTEMS=="usb",ACTION=="add",KERNEL=="event*",ATTRS{idVendor}=="222a",ATTRS{idProduct}=="0001",SYMLINK+="twofingtouch",RUN+="/bin/chmod a+r /dev/twofingtouch"
KERNEL=="event*",ATTRS{name}=="ILITEK Multi-Touch-V3000",SYMLINK+="twofingtouch",RUN+="/bin/chmod a+r /dev/twofingtouch"

3) Install some packages to auto calibrate

sudo apt install xserver-xorg-input-evdev xinput-calibrator

4) Add an X configuration

sudo nano /usr/share/X11/xorg.conf.d/90-touchinput.conf

Section "InputClass"
    Identifier "calibration"
    Driver "evdev"
    MatchProduct "ILITEK Multi-Touch-V3000"
    MatchDevicePath "/dev/input/event*"
    Option "Emulate3Buttons" "True"
    Option "EmulateThirdButton" "1"
    Option "EmulateThirdButtonTimeout" "750"
    Option "EmulateThirdButtonMoveThreshold" "30"

5) install udev rules :

sudo nano /etc/udev/rules.d/ 99-input-tagging.rules

ACTION=="add", KERNEL=="event*", SUBSYSTEM=="input", TAG+="systemd", , ENV{SYSTEMD_ALIAS}+="/sys/subsystem/input/devices/$env{ID_SERIAL}"

6) Application on startup :

nano ~/.config/lxsession/LXDE-pi/autostart


7) reboot

sudo reboot

test :

twofing --debug

or via SSH :

export DISPLAY=:0 && twofing --debug

You should see

pi@raspberrypi:~ $ export DISPLAY=:0 && twofing --debug 
twofing, the two-fingered daemon 

Input device name: "ILITEK Multi-Touch-V3000" 
XInput device id is 8. 
XInput device id for calibration is 8. 
Start calibration 
No calibration data found, use default values. 
Calibration: MinX: 1; MaxX: 16384; MinY: 1; MaxY: 9600 
Invert X Axis: No 
Invert Y Axis: No 
Swap Axes: No 
Calibration Matrix:     1.000000        0.000000        0.000000 
                       0.000000        1.000000        0.000000 
Grab Result: 0 
Reading input from device ... (interrupt to exit) 
Current window: 'pcmanfm' 
Use default profile.

and the menu appears.
[Ctrl]+[C] to interrupt.

Sources : … p?t=138575 … uchscreen/

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#2 04-07-2020 19:06:07


Re : [Tutorial] Two finger touch for right click on Raspbian (2018 update)

Hi all,

This method doesn't work for me on my raspbian buster
In fact the last point to automatically start twofing.

Indeed, if i create a file named autostart in .config/lxsession/LXDE-pi/ my desktop doesn't appear at boot. Just right-clic (with a mouse) and i can launch a terminal.

So i have create a file here:

[Desktop Entry]
Name=Twofing autostart
Comment=Start the twofing program
Exec=twofing --wait

The option --wait is to wait ( yikes ) the desktop before launch the program.
It take maybe 1 minute to access to twofing.

Post with the DiskioPi \o/

Dernière modification par belzebuteu (04-07-2020 19:08:13)

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#3 04-07-2020 19:16:54


Re : [Tutorial] Two finger touch for right click on Raspbian (2018 update)

Hello belzebuteu, thanks for the update  smile

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