Waveshare 3.5" display on Pi 4 -Bookworm 64 Bit

Source: https://www.waveshare.com/wiki/3.5inch_RPi_LCD_(C)_Manual_Configuration#For_Bookworm_System

For Raspberry Pi 4 & Raspberry Pi 5

Download and Compile fbcp

Open the Raspberry Pi terminal and execute:

sudo apt install libraspberrypi-dev -y
sudo apt-get install unzip -y
sudo apt-get install cmake -y
sudo wget https://files.waveshare.com/upload/1/1e/Waveshare35c.zip
sudo unzip ./Waveshare35c.zip
sudo cp waveshare35c.dtbo /boot/overlays/
sudo wget https://files.waveshare.com/upload/1/1e/Rpi-fbcp.zip
sudo unzip ./Rpi-fbcp.zip
cd rpi-fbcp/
sudo rm -rf build
sudo mkdir build
cd build
sudo cmake ..
sudo make -j4
sudo install fbcp /usr/local/bin/fbcp

Edit "config.txt" file:

sudo nano /boot/firmware/config.txt

Blocking the following sentence:

Add the following code at the end of config.txt:

dtparam=spi=on
dtoverlay=waveshare35c
hdmi_force_hotplug=1
max_usb_current=1
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
hdmi_cvt 480 320 60 6 0 0 0
hdmi_drive=2
display_rotate=0

Set Auto-start startx and fbcp

• Open ".bash_profile". If there is no ".bash_profile" file, you can create one:

sudo nano ~/.bash_profile

Add the following code at the bottom of the ".bash_profile" file:

if [ "$(cat /proc/device-tree/model | cut -d ' ' -f 3)" = "5" ]; then
    # rpi 5B configuration
    export FRAMEBUFFER=/dev/fb1
    startx  2> /tmp/xorg_errors
else
    # Non-pi5 configuration
    export FRAMEBUFFER=/dev/fb0
    fbcp &
    startx  2> /tmp/xorg_errors
fi

• Open the "99-fbturbo.~" file, if it exists, you need to check fb is "fb0":

sudo nano /usr/share/X11/xorg.conf.d/99-fbturbo.~

Add the following code in the "99-fbturbo.~" file:

Section "Device"
        Identifier      "Allwinner A10/A13 FBDEV"
        Driver          "fbturbo"
        Option          "fbdev" "/dev/fb0"

        Option          "SwapbuffersWait" "true"
EndSection

Set CLI Auto-login

sudo raspi-config nonint do_boot_behaviour B2
sudo raspi-config nonint do_wayland W1
sudo reboot

After rebooting, the main screen can normally display. Note 1: Please ensure the username of the Raspberry Pi is "pi", otherwise, it cannot automatically log in. Note 2: After setting the above configuration, it may take a while to reboot the system and load SSH.

Configure Touch

• Install calibrator software:

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
sudo apt-get install xinput-calibrator

• Edit 99-calibration.conf configuration file:

sudo nano /usr/share/X11/xorg.conf.d/99-calibration.conf

Add the following content to the "99-calibration.conf" configuration file:

Section "InputClass"
        Identifier      "calibration"
        MatchProduct    "ADS7846 Touchscreen"
        Option  "Calibration"   "3932 300 294 3801"
        Option  "SwapAxes"      "1"
        Option "EmulateThirdButton" "1"
        Option "EmulateThirdButtonTimeout" "1000"
        Option "EmulateThirdButtonMoveThreshold" "300"
EndSection

Reboot to take effect.

sudo reboot