7inch DSI LCD (C)

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7inch DSI LCD (C) 7inch capacitive Touch Screen LCD for Raspberry Pi DSI Interface, 1024 x 600 resolution

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Primary Attribute Category: OLEDs / LCDs, LCD, Raspberry Pi LCD {{{userDefinedInfo}}}: {{{userdefinedvalue}}} Brand: Waveshare

Website International: 7inch DSI LCD (C) Chinese: 7inch DSI LCD

Onboard Interfaces DSI

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Overview

Features

• 7-inch DSI display with 5-point capacitive touch.
• IPS panel with a hardware resolution of 1024×600.
• Toughened glass capacitive touch panel with 6H hardness.
• Support Pi5/4B/CM4/3B+/3A+/3B/CM3+/CM3.
• Drive the LCD directly through the DSI interface of the Raspberry Pi, with a refreshing rate of up to 60Hz.
• When working with the Raspberry Pi, it supports Bookworm/Bullseye/Buster.
• Brightness is adjustable by software.

Hardware Connection

Working with Pi4B/3B+/3B/3A+

1. Connect the DSI interface of the LCD to the DSI interface of the Raspberry Pi with a 15PIN FPC cable.
2. Install the Raspberry Pi with its back facing down onto the base board of the LCD screen, and connect it to 5V power supply and I2C1 communication using 4-pin DuPont cables.
The final connection is shown below:

Working with Pi5/CM4/CM3+/CM3

1. Use the "DSI-Cable-12cm" ribbon cable to connect the DSI interface of the LCD to the 22PIN DSI1 interface of the Raspberry Pi.
2. Connect it to the 5V power supply and the I2C1 communication of the Raspberry Pi using a 4-pin cable.
The final connection is shown below:

Software Setting

For Bookworm and Bullseye System

• 1. Insert the TF card into the PC, download and use Raspberry Pi Imager to program the corresponding image.

• 2. After programming the image, open the "config.txt" file located in the root directory of the TF card. Add the following code at the end of config.txt, save the file, and safely eject the TF card.

Note: As Pi 5/CM4/CM3+/CM3 has two MIPI DSI interfaces, please ensure to use the correct DSI interface and command. DSI1 is recommended by default.

dtoverlay=vc4-kms-v3d
#DSI1 Use
dtoverlay=vc4-kms-dsi-waveshare-panel,7_0_inchC,i2c1
#DSI0 Use
#dtoverlay=vc4-kms-dsi-waveshare-panel,7_0_inchC,i2c1,dsi0

• 3. Insert the TF card into the Raspberry Pi, power on the Raspberry Pi, and wait for a few seconds for the display. Once the system boots up, you should be able to interact with it normally, including touchscreen functionality.

For Buster System

Method 1: Install Driver Manually

1. Download the image of the newest version Raspberry Pi, download the compressed file to the PC, and extract the .img file.
2. Connect the TF card to PC, use SDFormatter to format the card.
3. Open Win32DiskImager software, select the system image prepared in step 1 and click write to burn the system image.
4. After the programming is completed, connect the TF card to the Raspberry Pi, start the Raspberry Pi, and log in to the terminal of the Raspberry Pi (you can connect the Raspberry Pi to an HDMI display or log in remotely with ssh).

#Step 1: Download and enter the Waveshare-DSI-LCD driver folder
git clone https://github.com/waveshare/Waveshare-DSI-LCD
cd Waveshare-DSI-LCD
 
#Step 2: Enter "uname --all" in the terminal to view the kernel version and "cd" to the corresponding file directory
#6.1.21 then run the following command
cd 6.1.21
 
#Step 3: Please check the bits of your system, enter the 32 directory for 32-bit systems, and enter the 64 directory for 64-bit systems
cd 32
#cd 64
 
#Step 4: Enter your corresponding model command to install the driver, pay attention to the selection of the I2C DIP switch
#7inch DSI LCD (C) 1024×600 driver:
sudo bash ./WS_xinchDSI_MAIN.sh 70C I2C1
 
#Step 5: Wait for a few seconds, when the driver installation is complete and no error is prompted, restart and load the DSI driver and it can be used normally
sudo reboot

Note: The above steps need to ensure that the Raspberry Pi can be connected to the Internet normally.
5. Wait for the system to restart, it will be able to display and touch normally.

Method 2: Program Pre-install Image

1. Select your corresponding Raspberry Pi version image, download and decompress it as ".img" file.
Raspberry Pi 4B/CM4 version download: Waveshare DSI LCD - Pi4 pre-install image
Raspberry Pi 3B/3B+/CM3 version download: Waveshare DSI LCD - Pi3 pre-install image
2. Connect the TF card to the PC and use SDFormatter to format the TF card.
3. Open Win32DiskImager software, choose the system image prepared in the first step, and then click "write" to write the system image.
4. After the programming is finished, open the config.txt file in the root directory of the TF card, add the following code under [all], save and eject the TF card safely.

dtoverlay=WS_xinchDSI_Screen,SCREEN_type=2,I2C_bus=1
dtoverlay=WS_xinchDSI_Touch,I2C_bus=1

5. Connect the TF card to the Raspberry Pi, and start the Raspberry Pi, wait for about 30 seconds to display and touch normally.

Buster System Notices

1. Update the system and run the following commands:

sudo apt-get update
sudo apt-get full-upgrade

Note: After updating the system, some diver files installed before may be covered, and you need to install the driver again so that it can display normally.
2. Replace the main board.
If the driver installed was for the Raspberry Pi 4 Model B and the user decides to change the mainboard, for example, change to the Raspberry Pi 3 Model B+, it may result in the display screen not showing properly.
This is because the Pi 4 and Pi 3 require loading different driver files. To ensure proper display functionality on the new mainboard, the user needs to reinstall the drivers according to the instructions #For Buster System.

Backlight Control

WaveShare provides the corresponding demo for the application (only supports Bookworm and Bullseye systems). Users can install it by the following commands:

wget https://files.waveshare.com/upload/f/f4/Brightness.zip
unzip Brightness.zip
cd Brightness
sudo chmod +x install.sh
./install.sh

After installation, you can open it: Menu -》Accessories -》Brightness:

In addition, you can also input the following commands to control the backlight brightness in the terminal:

echo X | sudo tee /sys/class/backlight/*/brightness

X indicates any number from 0 to 255. 0 means the backlight is the darkest, and 255 means the backlight is the brightest. For example:

echo 100 | sudo tee /sys/class/backlight/*/brightness
echo 0 | sudo tee /sys/class/backlight/*/brightness
echo 255 | sudo tee /sys/class/backlight/*/brightness

Bookworm Touchscreen Rotation

• 1. Open "Screen Configuration" application.
  

• 2. Enter "Screen" -> "DSI-1" -> "Touchscreen", and select "10-0014 Goodix Capacitive TouchScreen".
  

• 3. Click "Apply", and then close the current window. Reboot according to the pop-up prompts to complete the specified touchscreen.

• 4. Enter "Screen" -> "DSI-1"->"Orientation", and select the rotation direction. Then click on "Apply" to complete the display and touch synchronous rotation.
  

Note: Only the Bookworm system supports the above synchronous rotation method, for Bullseye and Butser systems, after the display rotates, you need to set the touch rotation additionally.

Bullseye/Buster Display Rotation

• 1. Open "Screen Configuration" application.
  

• 2. Enter "Screen"->"DSI-1"->"Orientation", select the rotation direction, and then click on "Apply" to complete the display rotation.
  

Bullseye/Buster Touch Rotation

sudo nano /boot/config.txt
#Change the command for the touch rotation angle at the end of the config.txt file, reboot it to take effect (the command for 0° touch direction exists by default) 
#90°:
dtoverlay=WS_xinchDSI_Touch,invertedx,swappedxy,I2C_bus=1
#180°:
dtoverlay=WS_xinchDSI_Touch,invertedx,invertedy,I2C_bus=1
#270°:
dtoverlay=WS_xinchDSI_Touch,invertedy,swappedxy,I2C_bus=1
#0°:
dtoverlay=WS_xinchDSI_Touch,I2C_bus=1

lite Version Rotation

sudo nano /boot/cmdline.txt
#Add the command to display the rotation angle at the beginning of the cmdline.txt file, save and reboot to take effect
#Display rotates 90°
video=DSI-1:1024x600M@60,rotate=90
#Display rotates 180°
video=DSI-1:1024x600M@60,rotate=180
#Display rotates 270°
video=DSI-1:1024x600M@60,rotate=270

Sleep Mode

Run the following commands on the Raspberry PI terminal to enter the sleep mode:

xset dpms force off

Disable Touch

At the end of the "config.txt" file, add the following commands to disable touching (the config file is located in the TF card root directory, or you can find it using command "sudo nano /boot/config.txt"):

disable_touchscreen=1

Note: this command takes effect after rebooting.

Resources

Pre-built image

• 2022-01-28-raspios-bullseye-arm64 image
• 2022-01-28-raspios-bullseye-arm32 image
• Waveshare DSI LCD - Pi4 pre-install image
• Waveshare DSI LCD - Pi3 pre-install image

Software

• Panasonic SDFormatter
• Win32DiskImager
• PuTTY

3D drawing

• 7inch DSI LCD (C) 3D drawing
• 7inch DSI LCD (C) 3D preview file

FAQ

Question:What is the power consumption of the 7inch DSI LCD (C)?

 Answer:

When powered by 5V, the operating current of the backlight on is about 500mA, and the operating current of the backlight off is about 100mA.

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Question:Why do I get an error when using the 2021-10-30-raspios-bullseye-armhf version of the system with the camera?

 Answer:

Execute the following commands:
sudo raspi-config -> Advanced Options -> Glamor -> Yes (Enabled) -> Ok -> Finish -> Yes (Reboot)

Question:How to switch I2C1 communication of 7inch DSI LCD (C) to I2C0?

 Answer:

• 1. Weld two resistors in the figure below with 0-ohm resistance.

• 2. Modify the end of the /boot/config.txt file.

I2C_bus=1 changed to I2C_bus=10

After the above modification, the original I2C1 wiring (GPIO3 and GPIO5 of RPi) needs to be disconnected.

Question:How to lower the LCD brightness?

 Answer:

The 1.2R shown in the diagram is a backlight resistor, and increasing its value can reduce the backlight.

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