Template: 13.3inch PiPad C4 Guide

From Waveshare Wiki
Jump to: navigation, search

Write Raspberry Pi OS

hdmi_cvt 1920 1080 60 6 0 0 0
  • Save and insert the micro SD card into Raspberry Pi.
  • Connect the Magic mirror to the network and power on Raspberry Pi.
  • After booting, you can access Raspberry Pi via SSH/VNC, or directly connect the keyboard and mouse.

Check the USB Audio Card

  • Test the sound output device:
aplay -l
  • Test the sound input device:
arecord -l


To reduce consumption, USB interfaces are disabled in CM4 by default. If you need to use USB ports, please add the following line to the config.txt file.


Then reboot the CM4. If you use the newest Bullseye image, the USB2.0 is set to OTG mode by default and occurs the error in CM4:

config failed, hub doesn't have any ports! (err -19)

To remove the errors, you can remove the line otg_mode=1 from the config.txt file and add the line:


13.3inch PiPad C42.png

Kepp Display Always On

  • Modify lightdm.conf.
sudo nano /etc/lightdm/lightdm.conf
  • Find the line "Xserver-command" below the [SeatDefaults] section and change it from:


xserver-command=X -s 0 -dpms
  • -s # – set screen saver not enabled.
  • dpms turn off power saving management.
  • Then save and reboot:
sudo reboot


To use the RS232 interface, please modify the config.txt file:

sudo nano /boot/config.txt

Add the following line to the file and save.



To use the RS485, you need to enable the serial port of the PI.

sudo raspi-config

Choose Interface Option -> Serial -> No -> Yes, then reboot.

Keys Description


  • 1: Open or Close LCD display. If you don't need the LCD for a long time, you can use this button to reduce consumption.
  • 2: Direction button.
  • 3: "OK" function.
  • 4: Open the menu and the "Return" function.