Raspberry Pi 3.5inch DPI LCD User Guide

】Resource
[] 3D Drawing

3.5inch DPI LCD 3D Drawing

3.5inch DPI LCD 3D preview file

[] Software

Panasonic SDFormatter

Win32DiskImager

PuTTY

】Introduction

640 x 480, 3.5inch IPS Display for Raspberry Pi, DPI interface, 5-point capacitive touch control.

】Features

[] 3.5inch IPS Display, 640 x 480 hardware resolution.

[] Designed for Raspberry Pi, based on Raspberry Pi 40pin GPIO interface.

[] Using the DPI666 interface of Raspberry Pi to drive LCD, refresh rate up to 60Hz.

[] Drive capacitive touch through the I2C interface of Raspberry Pi, 5-point touch, toughened glass panel, hardness up to 6H.

[] Supports Raspbian and Kali systems.

】Software settings

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 Bookworm and 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-35inch
dtoverlay=waveshare-35dpi-3b-4b
dtoverlay=waveshare-35dpi-3b
dtoverlay=waveshare-35dpi-4b
dtoverlay=waveshare-35dpi
dtoverlay=waveshare-touch-35dpi

5. Download the 3.5inch DPI LCD DTBO file and extract the dtbo files. Copy these files to the overlays directory (/boot/overlays/).

6. 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=dpi18
enable_dpi_lcd=1
display_default_lcd=1
extra_transpose_buffer=2
dpi_group=2
dpi_mode=87
dpi_output_format=0x6f006
hdmi_timings=640 0 20 10 10 480 0 10 5 5 0 0 0 60 0 60000000 1
dtoverlay=waveshare-35dpi-3b-4b
dtoverlay=waveshare-35dpi-3b
dtoverlay=waveshare-35dpi-4b

Note: If it is Raspberry Pi 4, also need to comment out dtoverlay=vc4-fkms-V3D.

2. Download the 3.5inch 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 3.5-inch DPI LCD into the 40PIN GPIO interface of the Raspberry Pi, power on the Raspberry Pi, and wait for about ten seconds to display normally.

】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 Rotating

After the display is rotated, the position of the 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:

5. Save and reboot your Pi.

sudo reboot

After completing these steps. The LCD could rotate 90 degrees in both the display and touch functions.

Note:

90 degrees: Option "CalibrationMatrix" "0 1 0 -1 0 1 0 0 1"

180 degrees: Option "CalibrationMatrix" "-1 0 1 0 -1 1 0 0 1"

270 degrees: Option "CalibrationMatrix" "0 -1 1 1 0 0 0 0 1"

】Others

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:

#xserver-command=X

Modify this code to

xserver-command=X -s 0 -dpms

[] -s # –Disable the display protection.

[] dpms Disable power saving.

Reboot.

sudo reboot

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 PIN as PWM mode
gpio pwmc 100   
gpio -g pwm 18 0         #Brightest
gpio -g pwm 18 1023      #Dimmest
gpio -g mode 18 out      #Clear the PIN to output mode.

Turn on/off HDMI output

You can use the following commands to disable/enable the displaying.

vcgencmd display_power 0
vcgencmd display_power 1

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:

Raspberry Pi Branch Details

Buster Release Notes

Bullseye Release Notes

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.

】Interface

The pins labeled "NC" below mean that those pins of Raspberry Pi are not occupied by the LCD, and the user can use them for other applications.

PIN NO.	SYMBOL	DESCRIPTION
1	NC	Power positive (3.3V power input)
2	5V	Power positive (5V power input)
3	VSYNC	Vertical sync
4	5V	Power positive (5V power input)
5	HSYNC	Horizontal sync
6	GND	Ground
7	B2	RGB signal cable
8	G4	RGB signal cable
9	GND	Ground
10	G5	RGB signal cable
11	G7	RGB signal cable
12	PWM	Backlight control
13	TP_INT	Touch Panel interrupt
14	GND	Ground
15	R4	RGB signal cable
16	R5	RGB signal cable
17	NC	Power positive (3.3V power input)
18	R6	RGB signal cable
19	TP_SDA	I2C SDA for touch panel
20	GND	Ground
21	B7	RGB signal cable
22	R7	RGB signal cable
23	TP_SCL	I2C SCL for touch panel
24	B6	RGB signal cable
25	GND	Ground
26	B5	RGB signal cable
27	LCD_CLK	LCD clock
28	DE	LCD data enable
29	B3	RGB signal cable
30	GND	Ground
31	B4	RGB signal cable
32	G2	RGB signal cable
33	G3	RGB signal cable
34	GND	Ground
35	NC	GPIO interface
36	G6	RGB signal cable
37	NC	GPIO interface
38	R2	RGB signal cable
39	GND	Ground
40	R3	RGB signal cable

Raspberry Pi Long-press Right-click Setting

Test environment: 2022-04-04-raspios-bullseye-armhf 32-bit system.

Supported models: Support Waveshare DSI LCD, DPI LCD, and HDMI LCD capacitive touch screen series.

Software Installation

wget https://files.waveshare.com/upload/1/18/Evdev-right-click-emulation.zip
unzip Evdev-right-click-emulation.zip
cd evdev-right-click-emulation
sudo apt install build-essential libevdev2 libevdev-dev
cd 'evdev-right-click-emulation'
sudo cp 'out/evdev-rce' '/usr/local/bin/'
sudo chmod +x '/usr/local/bin/evdev-rce'

Enter the command:

sudo evdev-rce

After running, you can touch and long press to realize the right-click function.

Set IP

sudo usermod -G 'input' -a pi
echo 'uinput' | sudo tee -a /etc/modules
sudo nano  /etc/udev/rules.d/99-uinput.rules

Add in 99-uinput.rules file.

KERNEL=="uinput", MODE="0660", GROUP="input"

save it and run it in the terminal.

sudo udevadm control --reload-rules
sudo udevadm trigger

Then reboot:

sudo reboot

Run after reboot (no sudo needed at this point).

evdev-rce

After running, you can touch and long press to realize the right-click function.

Set Startup

Enter the terminal.

sudo mkdir ~/.config/autostart
sudo nano ~/.config/autostart/right_click.desktop

Add the following in right_click.desktop.

[Desktop Entry]
Version=1.0
Type=Application
Name=evdev-rce
GenericName=Enable long-press-to-right-click gesture
Exec=env LONG_CLICK_INTERVAL=1000 LONG_CLICK_FUZZ=200  /usr/local/bin/evdev-rce
Terminal=true
StartupNotify=false

If you want to modify the sensitivity, you can modify the size of the two parameters, LONG_CLICK_INTERVAL=1000 LONG_CLICK_FUZZ=200.

Software

To：

Dear Customers, There may be a lag of several hours before we could process your order, depending on the time difference between your location and ours. Sincerely hoping your understanding!

Email(support)

services01@spotpear.com

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