3.5inch RPi LCD (B) Manual Configuration

For the Bullseye 64-bit system, you need to configure it manually as shown below:

Install Imager

Please download the bullseye imager 64-bit from Raspberry Pi website.
1) Download it on the PC and unzip it to get the ".img" file.
2) Connect the TF card to the PC, open Win32DiskImager.exe software, select the system image downloaded in step 1, and click 'Write' to write the system image. Then, open the TF card file folder.
3) Download and unzip the waveshare35b-v2.dtbo device tree file to add it to the /boot/overlay folder.
4) Connect the TF card to the Raspberry Pi, boot the Raspberry Pi, and log in to the Raspberry Pi terminal (you can connect the Raspberry Pi to the HDMI display or use SSH to remotely login).

Configure Driver File

Open the "config.txt" file under the boot directory, comment out "dtoverlay=vc4-kms-v3d", and add the following at the end of [all]:

dtparam=spi=on
dtoverlay=waveshare35b-v2

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

Config Touch

Add the following codes in the terminal:

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

Add the following content in 99-calibration.conf 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

FBCP Porting

Network is required for this step:

sudo apt-get install cmake
wget  https://files.waveshare.com/upload/1/1e/Rpi-fbcp.zip
unzip Rpi-fbcp.zip
cd rpi-fbcp/
mkdir build
cd build/
cmake ..
make
sudo install fbcp /usr/local/bin/fbcp

Set Auto-start

sudo nano /etc/rc.local

Add the following codes before "exit 0":

sleep 7
fbcp &

sudo reboot

Reboot it, and the screen displays normally.