touchscreen calibration under Raspbian Jessie Lite

Hi,

I have problem with touchscreen calibration under Raspbian Jessie Lite (Pi 3 and official 7 inch touchscreen 800*480). Please consider that no X server, so xinput_calibrator doesn't work !

I use python pygame for graphics, and unfortunately the touching points and mouse positions don't fit. How can I calibrate or which modules need to install ?

0 jlyon426 over 4 years ago

Hi,
I have problem with touchscreen calibration under Raspbian Jessie Lite employee monitoring (Pi 3 and official 7 inch touchscreen 800*480). Please consider that no X server, so xinput_calibrator doesn't work !
I use python pygame for graphics, and unfortunately the touching points and mouse positions don't fit. How can I calibrate or which modules need to install ? https://www.worktime.com/employee-monitoring

Answering my own question

0) In OS Jessie NO DRIVER REQUIRED! for XPT2046 or ADS7846 Touchscreen. Do not install the original driver from Waveshare or any other driver announced as compatible. You will kill your Jessie for sure. At least Waveshare driver totally disables WiFi module functionality!!!

1 ) sudo nano /boot/config.txt
add
Code: Select all

dtparam=i2c_arm=on
dtparam=spi=on
dtoverlay=ads7846,penirq=25,speed=10000,penirq_pull=2,xohms=150
2) Create directory /etc/X11/xorg.conf.d and file 99-calibration.conf in that directory
Add the following into the file
Code: Select all

Section "InputClass"
        Identifier "calibration"
        MatchProduct "ADS7846 Touchscreen"
        Option "Calibration" "3853 170 288 3796"
        Option "SwapAxes" "1"
EndSection
3) REBOOT aaaaand, have fun!!!!!!
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