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Waveshare 3.5 inch SPI TFT LCD display

Connect the screen​

Connect the screen with the development board as follows:

Waveshare35-spi-display

Use rsetup to enable the corresponding overlay​

  • after entering rsetup, enter the device tree management interface.
  • Enable the overlay of Waveshare 3.5 inch Display
[*] Enable Waveshare 3.5 inch Display on SPI1

Config the display​

  • backup /etc/X11/xorg.conf.d/20-modesetting.conf
sudo cp /etc/X11/xorg.conf.d/20-modesetting.conf /etc/X11/xorg.conf.d/20-modesetting.conf.bak
  • Clear the original content and add the following
Section "Device"
     Identifier  "Rockchip Graphics"
     Driver      "fbdev"
     Option      "fbdev"          "/dev/fb1"
     Option      "DRI"            "2"
EndSection

please check whether the device is /dev/fb0 or /dev/fb1.

Configure Touch​

Add a configuration file 99-touchscreen-calibration.conf under /etc/X11/xorg.conf.d with the following contents:

Section "InputClass"
    Identifier "calibration"
    MatchProduct "ADS7846 Touchscreen"
    Option "TransformationMatrix" "-1 0 1 0 1 0 0 0 1"
EndSection

Reboot the system​

sudo reboot

After restarting the system, the screen should already be displayed normally.