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Display.md

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Display

1. Hardware Connection

Connect DSI interface of the display screen using 15PIN FPC cable. We didn't use touch function, so we didn't connect 4pin (Without I2C connetion)

2. Software Setting

sudo apt install git
git clone https://github.com/waveshare/Waveshare-DSI-LCD
cd Waveshare-DSI-LCD/
# choose kernel your kernel verion
cd 6.1.21/
# choose your bits of your system (32 or 64)
cd 64/
# Install Driver
sudo bash ./WS_xinchDSI_MAIN.sh 79 I2C0
# Reload boot firmware by reboot
sudo reboot

3. Rotate Display

Display showed a vertical screen.

sudo nano /boot/cmdline.txt

Add following line at the beginning of the file.

video=DSI-1:400x1280M@60,rotate=90

Of course you can choose the angle. (0, 90, 180, 270)

sudo reboot

after adding rotation information, reboot RaspberryPi for check.

4. Rotate Display not worked

In our case, ‘video=DSI-1:400x1280M@60,rotate=90’ didn’t worked. We modify ‘M@60’ to ‘e’, and it worked well. So add following line at the beginning of the file.

video=DSI-1:400x1280**e**,rotate=90

video=DSI-1:400x1280e,rotate=90

5. Check Display

Check your display shows horizental CLI window.

6. Trouble shooting

If your system has some problem of initial boot or display, check that /boot/config.txt

sudo nano /boot/config.txt
# If this file doesn’t have ‘dtoverlay=vc4-kms-v3d’, then add it.

There is a possibility of conflict if you use ‘kms’ and ‘fkms’ at the same time. In our case, just using ‘dtoverlay=vc4-kms-v3d’ worked. If this conflict occured, you can modify your config.txt by inserting SD card to your laptop.

Reference

  1. Introduction Page of Display Manufacturer
  2. Github Repository for Display Driver Installation