3.5inch RPi LCD (G)

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3.5inch RPi LCD (G)
3.5inch RPi LCD (G)

320×480, I2C / SPI
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Overview

Introduction

The 3.5-inch RPi LCD (G) is equipped with a resistive touch screen with a resolution of 320 × 480, supporting two connection methods: Pigo pin communication and GH1.25 11PIN cable connection, and providing example materials for Raspberry Pi, ESP32, Pico, Arduino, etc.

Features

  • 320×480 resolution, 262K RGB colors, clear and colorful displaying effect
  • High touch screen transmittance, fast response and long lifetime
  • Embedded with ST7796S driver chip and XPT2046 resistive touch control chip, using SPI communication, minimizes required IO pins
  • Supports two connection methods: Pigo pin communication and GH1.25 11PIN cable connection
  • Adopts Immersion Gold process, nice looking, with better durability
  • Provides complete demos and development materials for Raspberry Pi, Raspberry Pi Pico, ESP32 and Arduino platforms

Interfaces

3.5inch-RPi-LCD-G-details-11.jpg

Dimensions

3.5inch-RPi-LCD-G-details-size.jpg

Specifications

Parameter Name Parameter
Supply Voltage 5V
Logic Voltage 3.3V
LCD type IPS
Communication Interface SPI
Controller Chip Display: ST7796S
Touch: XPT2046
Resolution 320 (H) x 480 (V)
Display Size 49.36 (H) x 73.84 (V) mm
Dimensions 56.00 (H) x 85.00 (V) mm

Raspberry Pi Tutorial

Hardware Connection

This product supports two connection methods to Raspberry Pi

Method 1: Connect the Raspberry Pi through Pigo Pin

500px-3.5inch-RPi-LCD-G-details-5.jpg

Method 2: Connect the Raspberry Pi through GH1.25 13PIN Cable

Function pin BCM encoding Board physical pin number
TP_IRQ 17 11
TP_CS 7 26
LCD_BL 18 12
LCD_RST 27 13
LCD_DC 22 15
LCD_CS 8 24
SCLK 11 23
MOSI 10 19
MISO 9 21
GND GND 6
VCC 5V 4

Enable SPI Interface

Enter the following command in the terminal: 

sudo raspi-config nonint do_spi 0

Python Environment

  • Install libraries
sudo apt-get update
sudo apt-get install python3-pip
sudo apt-get install python3-pil
sudo apt-get install python3-numpy
sudo apt-get install python3-spidev
sudo apt-get pip install smbus2
  • Download and run the demo
wget https://files.waveshare.com/wiki/3.5inch%20RPi%20LCD%20(G)/3inch5_RPi_LCD_G_RPI.zip
unzip 3inch5_RPi_LCD_G_RPI.zip
cd 3inch5_RPi_LCD_G_RPI
sudo python ./main.py

Bookworm System Desktop Display

Install Driver Module

Note: Bookworm requires the official version 6.6.51 kernel version or higher.
  • Determine the current kernel version
uname -a

This command will output the complete kernel version information. For example, executing this command on Raspberry Pi 5 may produce the following output: 

Linux raspberrypi 6.6.51+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.6.51-1+rpt3 (2024-10-08) aarch64 GNU/Linux

This indicates that the kernel version number of this system is 6.6.51+rpt-rpi-2712, and it uses 64-bit ARM (AArch64) architecture.

  • Download and install the ST7796 driver module
# Step 1: Download and enter the Waveshare-st7796s driver folder
wget https://files.waveshare.com/wiki/common/Waveshare-st7796s.zip
unzip Waveshare-st7796s.zip
cd Waveshare-st7796s
 
# Step 2: cd to the directory of the corresponding kernel version number
# Run the following command as in the example above
cd 6.6.51/64/rpi-2712-RPi5

# Copy the corresponding version of st7796s.ko to the current system
sudo cp st7796s.ko /lib/modules/$(uname -r)/kernel/drivers

# Make sure the module is loaded at boot time, add the module name to the /etc/modules file:
sudo nano /etc/modules

# Add at the end
st7796s

3.5F st7796.png
Enter the following statement in the terminal to handle kernel module dependencies: 

sudo depmod -a
  • Configure driver device tree
cd
wget https://files.waveshare.com/wiki/common/Waveshare35g.dtbo
sudo cp Waveshare35g.dtbo /boot/overlays/
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For Rpi4 & Rpi5

Configure Driver File

Refer to the steps here first #Install Driver Module

  • Edit config.txt configuration file
sudo nano /boot/firmware/config.txt

Comment out the dual-screen configuration statements
3.5F config dtbo1.png
Add the following statements at the end of [all] 

dtparam=i2c_arm=on
dtparam=i2c_arm_baudrate=50000
dtparam=spi=on
dtoverlay=Waveshare35g,fps=60,speed=48000000,rotate=90,penirq=17
hdmi_force_hotplug=1
max_usb_current=1
hdmi_group=2
hdmi_mode=87
hdmi_cvt 480 320 60 6 0 0 0
hdmi_drive=2

Create Screen Configuration File

Create 98-spi-screen.conf file 

sudo nano /etc/X11/xorg.conf.d/98-spi-screen.conf

Add the following parameters to 98-spi-screen.conf file 

Section "Device"
    Identifier "SPI Screen"    
    Driver "fbdev"
    Option "fbdev" "/dev/fb0"
EndSection

Note: After the entire process operation is completed, if they are not displayed, modify "/dev/fb0" to "/dev/fb1" and then restart it

Switch to X11

sudo raspi-config nonint do_wayland W1

Calibrate Resistive Touch Screen

Run the following statements on 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 statements in the 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

Restart to take effect

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For All Raspberry Pi Versions

It must be operated based on the bookworm lite version, 64-bit lite or 32-bit lite

Configure Driver File

Refer to the steps here first #Install Driver Module

  • Edit config.txt configuration file
sudo nano /boot/firmware/config.txt

Comment out the KMS and dual-screen configuration statements
FBCP CLOSE.jpg
Add the following statements at the end of [all] 

dtparam=i2c_arm=on
dtparam=i2c_arm_baudrate=50000
dtparam=spi=on
dtoverlay=Waveshare35g,fps=60,speed=48000000,rotate=90,ts_rotate_90
hdmi_force_hotplug=1
max_usb_current=1
hdmi_group=2
hdmi_mode=87
hdmi_cvt 480 320 60 6 0 0 0
hdmi_drive=2

Download Necessary Softwares

  • Install the Xorg service
sudo apt-get install --no-install-recommends xserver-xorg -y
sudo apt-get install --no-install-recommends xinit -y
  • Install desktop manager
sudo apt install lightdm -y
  • Install official Raspberry Pi GUI
sudo apt install raspberrypi-ui-mods -y
  • Install git
sudo apt install git -y
  • Install a browser (optional)
sudo apt install chromium-browser -y
  • Install a music player (optional)
sudo apt install vlc -y

Download and Run Driver

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/wiki/common/Rpi-fbcp.zip
sudo unzip ./Rpi-fbcp.zip
cd rpi-fbcp/
sudo rm -rf build
sudo mkdir -m 777 ./build
cd ./build
sudo cmake ..
sudo make -j4
sudo install fbcp /usr/local/bin/fbcp

Set Auto-start startx and fbcp

  • Open the Bash shell file, or create one if it does not exist
sudo nano ~/.bashrc

Add the following code to the end of the 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
    startx  2> /tmp/xorg_errors
fi
  • Create and edit a fbcp service file for autostart
sudo nano /etc/systemd/system/fbcp.service

Add service configuration in the file 

[Unit]
Description=Framebuffer Copy for Raspberry Pi
After=network.target

[Service]
ExecStartPre=/bin/sleep 20
ExecStart=/usr/local/bin/fbcp
Restart=always
User=root
Group=root

[Install]
WantedBy=multi-user.target

Reload the systemd configuration 

sudo systemctl daemon-reload

The service enables auto-start at boot 

sudo systemctl enable fbcp.service

Test the startup service 

sudo systemctl start fbcp.service

Calibrate Resistive Touch Screen

Run the following statements on 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 statements in the 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

Set CLI Auto-login

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

Note1: Make sure that the username of the Raspberry Pi is pi, otherwise it will not be able to log in automatically
Note2: After setting all the configurations above, the system takes longer to restart each time, and SSH also requires a moment to enter

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Bullseye System Dektop Display

Install Driver Module

Note: Bullseye requires the official version 6.1.21 kernel version or higher.
  • Determine the current kernel version
uname -a

This command will output the complete kernel version information. For example, executing this command on Raspberry Pi 5 may produce the following output: 

Linux raspberrypi 6.1.21-v8+ #1642 SMP PREEMPT Mon Apr  3 17:24:16 BST 2023 aarch64 GNU/Linux

This indicates that the kernel version number of this system is 6.1.21, and it uses 64-bit ARM (AArch64) architecture.

  • Download and install the ST7796 driver module
# Step 1: Download and enter the Waveshare-st7796s driver folder
wget https://files.waveshare.com/wiki/common/Waveshare-st7796s.zip
unzip Waveshare-st7796s.zip
cd Waveshare-st7796s
 
# Step 2: cd to the directory of the corresponding kernel version number
# Run the following command as in the example above
cd 6.1.21/64/

# Copy the corresponding version of st7796s.ko to the current system
sudo cp st7796s.ko /lib/modules/$(uname -r)/kernel/drivers

# Make sure the module is loaded at boot time, add the module name to the /etc/modules file:
sudo nano /etc/modules

# Add at the end
st7796s

3.5F st7796.png
Enter the following statement in the terminal to handle kernel module dependencies: 

sudo depmod -a
  • Configure driver device tree
cd
wget https://files.waveshare.com/wiki/common/Waveshare35g.dtbo
sudo cp Waveshare35g.dtbo /boot/overlays/

Configure Driver File

Refer to the steps here first #Install Driver Module

  • Edit config.txt configuration file
sudo nano /boot/config.txt

Comment out the KMS and dual-screen configuration statements
FBCP CLOSE.jpg
Add the following statements at the end of [all] 

dtparam=i2c_arm=on
dtparam=i2c_arm_baudrate=50000
dtparam=spi=on
dtoverlay=Waveshare35g,fps=60,speed=48000000,rotate=90,penirq=17
hdmi_force_hotplug=1
max_usb_current=1
hdmi_group=2
hdmi_mode=87
hdmi_cvt 480 320 60 6 0 0 0
hdmi_drive=2

Download and Run Driver

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/wiki/common/Rpi-fbcp.zip
sudo unzip ./Rpi-fbcp.zip
cd rpi-fbcp/
sudo rm -rf build
sudo mkdir -m 777 ./build
cd ./build
sudo cmake ..
sudo make -j4
sudo install fbcp /usr/local/bin/fbcp

Set Auto-start fbcp

  • Open rc.local file
sudo nano /etc/rc.local

Before adding the following code to exit 0, be sure to add "&" to run in the background, otherwise the system may not start. 

sleep 20
fbcp &

3.5F rocal.png

Calibrate Resistive Touch Screen

Run the following statements on 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 statements in the 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

Restart to take effect

Resources

Schematic Diagram

Demo

Datasheets

Softwares

FAQ

Support



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