Instructions

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Then, install the package for the touch function as well as copy a file:
sudo apt-get install xserver-xorg-input-evdev
sudo cp -rf /usr/share/X11/xorg.conf.d/10-evdev.conf /
usr/share/X11/xorg.conf.d/45-evdev.conf
Restart the Raspberry Pi:
sudo reboot
5. USAGE OF THE BUTTONS OF THE 3.2"TFT
On the side of the 3.2" display are three buttons.
These can be controlled and used via the GPIOs.
If the button is pressed, the signal is pulled to ground (Active_LOW).
The buttons are connected like that:
TFT Raspberry Pi
Key 1 GPIO 12
Key 2 GPIO 16
Key 3 GPIO 18
6. CALIBRATION OF THE TOUCHSCREEN
Calibration of the 3.2" displays:
If a calibration of the touchscreen should be necessary, it can be performed
like in the following steps. First of all, you must download the calibration
tool. Open the terminal and enter the following command:
sudo apt-get install -y xinput-calibrator
Restart the Raspberry Pi, so that the display is identified correctly:
sudo reboot
Now you can start the calibration with the following command:
DISPLAY=:0.0 xinput_calibrator
Four points will light up aer another which must be pressed to calibrate the
display. Aerwards, the terminal shows four calibration values. To save the
calibration, the adjustment must be saved in a file.
For that create a new folder:
sudo mkdir /etc/X11/xorg.conf.d