Create a new udev file

sudo vi /etc/udev/rules.d/95-ads7846.rules

and then, add this lines and save it

SUBSYSTEM=="input", ATTRS{name}=="ADS7846 Touchscreen", ENV{DEVNAME}=="*event*", SYMLINK+="input/touchscreen"

Load SPI and TS drivers.

sudo modprobe spicc
sudo modprobe -r ads7846
sudo modprobe ads7846

Now you can see this node.

ls /dev/input/touchscreen

Install the event test and touchscreen library sudo apt-get install evtest libts-bin Install the event test and touchscreen library

sudo apt-get install evtest

Now you can use some tools such as sudo evtest /dev/input/touchscreen which will let you see touchscreen events in real time, press on the touchscreen to see the reports.

sudo evtest /dev/input/touchscreen

==== TSLIB Calibration ==== Run startx sudo startx & Run ts_calibrate on /dev/fb2 sudo TSLIB_FBDEVICE=/dev/fb2 TSLIB_TSDEVICE=/dev/input/touchscreen ts_calibrate Follow the directions on the screen, touching each point.
Then, you can run following command. sudo TSLIB_FBDEVICE=/dev/fb2 TSLIB_TSDEVICE=/dev/input/touchscreen ts_test

1. The xinput-calibrator pakage download

sudo apt-get install xinput-calibrator

2. Remove old calibration data.

sudo rm /etc/X11/xorg.conf.d/99-calibration.conf

3. Run calibrator
You need to check DISPLAY=:N.0

sudo FRAMEBUFFER=/dev/fb2 startx &
sudo DISPLAY=:0.0 xinput_calibrator

Follow the directions on your screen.
then, you will get something like

Copy to “/etc/X11/xorg.conf.d/99-calibration.conf”

sudo mkdir /etc/X11/xorg.conf.d/
sudo vi /etc/X11/xorg.conf.d/99-calibration.conf

4. Reboot

sudo reboot