2.8inch DPI LCD
480 x 640, 2.8inch IPS Display for Raspberry Pi, DPI interface, 5-points capacitive touch control.
- 2.8 inch IPS Display， 480 x 640 hardware resolution.
- Designed for Raspberry Pi, based on Raspberry Pi 40pin GPIO interface.
- Using DPI666 interface of Raspberry Pi to drive LCD, refresh rate up to 60Hz.
- Drive capacitive touch through I2C interface of Raspberry Pi, 5-points touch, toughened glass panel, hardness up to 6H.
- Supports Raspberry Pi OS and Kali systems.
How to use
Please follow the steps below to slowly install the DPI LCD to the 40PIN GPIO interface of the Raspberry Pi.
If you don't know the difference between the two branches of Raspberry Pi OS, you can check the following introduction #Introducing the Raspberry Pi OS fork
For Raspberry Pi OS Bullseye branch
Please download the latest version of the image from the Raspberry Pi official website.
1. Download the compressed file to the PC, and extract the img file.
2. Connect the TF card to the PC and use SDFormatter to format the TF card.
3. Open the Win32DiskImager software, select the system image prepared in step 1, and click write to burn the system image.
4. After the programming is completed, open the config.txt file in the root directory of the TF card, add the following code at the end of config.txt and save it
dtoverlay=vc4-kms-v3d dtoverlay=vc4-kms-DPI-28inch dtoverlay=waveshare-28dpi-3b-4b dtoverlay=waveshare-28dpi-3b dtoverlay=waveshare-28dpi-4b
5. Download the 2.8inch DPI LCD DTBO file and extract the dtbo files. Copy these files to the overlays directory (/boot/overlays/),
6. Turn on the LCD backlight switch.
7. Insert the TF card into the Raspberry Pi, power on the Raspberry Pi, and wait for more than 30 seconds to display normally.
For Raspberry Pi OS Buster branch and Ubuntu system
1. Open the config.txt file in the root directory of the TF card, add the following code at the end of config.txt, save and safely eject the TF card.
gpio=0-9=a2 gpio=12-17=a2 gpio=20-25=a2 dtoverlay=dpi24 enable_dpi_lcd=1 display_default_lcd=1 extra_transpose_buffer=2 dpi_group=2 dpi_mode=87 dpi_output_format=0x7F216 hdmi_timings=480 0 26 16 10 640 0 25 10 15 0 0 0 60 0 32000000 1 dtoverlay=waveshare-28dpi-3b-4b dtoverlay=waveshare-28dpi-3b dtoverlay=waveshare-28dpi-4b
Note: If it is Raspberry Pi 4, also need to comment out dtoverlay=vc4-fkms-V3D.
2. Download the 2.8inch DPI LCD DTBO file and extract the dtbo files. Copy these files to the overlays directory (/boot/overlays/),
3. Save and quit the TF card safely, and insert the TF card into the Raspberry Pi.
4. Insert the 2.8inch DPI LCD into the 40PIN GPIO interface of the Raspberry Pi, power on the Raspberry Pi, and wait for about 30 seconds to display normally.
Introducing the Raspberry Pi OS fork
On December 2, 2021, the Raspberry Pi OS for Raspberry Pi split into two branches, the Buster branch and the Bullseye branch.
The Buster branch is a continuation of the old system, which is more stable and uses raspicam as the default camera subsystem.
The Bullseye branch adds some new features, including KMS as the default display driver and libcamera as the default camera subsystem.
Image download address
More detailed information can be found at:
Notes:The above information was updated on January 24, 2022. Due to the frequent update of the Raspberry Pi image, when you see this information, the relevant information may be out of date. The actual performance of the image shall prevail. This is for reference only.
Rotation(Working with Raspberry Pi)
Raspberry Pi OS and Kali display rotation
First check whether the KMS or FKMS driver is loaded on the system you are using.
Check method: In /boot/config.txt, check whether the line dtoverlay=vc4-kms-v3d or dtoverlay=vc4-fkms-v3d is turned on.
With KMS or FKMS driver loaded
Use the following command for display rotation:
sudo nano /etc/xdg/lxsession/LXDE-pi/autostart #Enter the command corresponding to the display rotation angle at the end of the autostart file, and it will take effect after rebooting the system. #0: rotate 0 degrees; 1: rotate 270 degrees; 2: rotate 180 degrees; 3: rotate 90 degrees xrandr -o 1
No KMS or FKMS driver loaded
Use the following command for display rotation:
sudo nano /boot/config.txt #Enter the command corresponding to the display rotation angle at the end of the config.txt file, and it will take effect after rebooting the system. #0: rotate 0 degrees; 1: rotate 90 degrees; 2: rotate 180 degrees; 3: rotate 270 degrees display_rotate=3
Touch to Rotate
After the display is rotated, the position of touch is incorrect because the touch doesn’t change with the display angle. So the touch also needs to be modified.
1. Install libinput.
sudo apt-get install xserver-xorg-input-libinput
If the system you installed is Ubuntu or Jetson Nano. The installation code is:
sudo apt install xserver-xorg-input-synaptics
2. Create the xorg.conf.d directory under /etc/X11/ (if the directory already exists, proceed directly to step 3).
sudo mkdir /etc/X11/xorg.conf.d
3. Copy the 40-libinput-conf file to the directory you created just now.
sudo cp /usr/share/X11/xorg.conf.d/40-libinput.conf /etc/X11/xorg.conf.d/
4. Edit this file.
sudo nano /etc/X11/xorg.conf.d/40-libinput.conf
Find the part of the touchscreen, add the following statement inside, and then save the file.
Option "CalibrationMatrix" "0 1 0 -1 0 1 0 0 1"
Similar to the picture below:
After completing these steps. The LCD could rotate 90 degrees for both display and touch function.
90 degree: Option "CalibrationMatrix" "0 1 0 -1 0 1 0 0 1"
180 degree: Option "CalibrationMatrix" "-1 0 1 0 -1 1 0 0 1"
270 degree: Option "CalibrationMatrix" "0 -1 1 1 0 0 0 0 1"
Disable power saving.
If you want to keep the display turning on all the time, you can disable the power-saving function.
Modify file lightdm.conf
sudo nano /etc/lightdm/lightdm.conf
Find the [SeatDefaults] option and uncomment the line"xserver-command", modify it as below:
Modify this code to
xserver-command=X -s 0 -dpms
- -s # –Disable the display protecting.
- dpms Disable power saving.
Control brightness by PWM
If you use Pi4, you need to update wiringPi first:
wget https://project-downloads.drogon.net/wiringpi-latest.deb sudo dpkg -i wiringpi-latest.deb gpio -v # Check if it is 2.52 version
Control the brightness by PWM
gpio -g mode 18 pwm #Configure the PWM pin gpio pwmc 100 gpio -g pwm 18 1023 #Set it brightnest gpio -g pwm 18 850 #(For Pi4, 850 is darkest; for Pi3, 680 is darkest) gpio -g mode 18 out #Free the pin and set it as output
Turn on/off the LCD
You can turn on/off the LCD with the following command.
Note: The command can only work when the PWM pin is free and in output mode.
sudo echo 1 | sudo tee /sys/class/backlight/rpi_backlight/bl_power sudo echo 0 | sudo tee /sys/class/backlight/rpi_backlight/bl_power
- The pin of "NC" means that the touch screen does not occupy this pin, and the user can use it for other applications.
|7||B2||RGB signal lines|
|8||G4||RGB signal lines|
|10||G5||RGB signal lines|
|11||G7||RGB signal lines|
|12||PWM||Backlight control (Pi4 can only turn on/off the backlight. Only the eralier versions support brightness adjustment with PWM)|
|13||TP_INT||Interrupt pin of touch panel|
|15||R4||RGB signal lines|
|16||R5||RGB signal lines|
|18||R6||RGB signal lines|
|19||TP_SDA||The I2C SDA of touch panel|
|21||B7||RGB signal lines|
|22||R7||RGB signal lines|
|23||TP_SCL||The I2C SCL of touch panel|
|24||B6||RGB signal lines|
|26||B5||RGB signal lines|
|27||LCD_CLK||Clock pin of LCD panel|
|28||DE||Data enable of LCD panel|
|29||B3||RGB signal lines|
|31||B4||RGB signal lines|
|32||G2||RGB signal lines|
|33||G3||RGB signal lines|
|36||G6||RGB signal lines|
|38||R2||RGB signal lines|
|40||R3||RGB signal lines|
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