NEC ME551-MPi4E Raspberry Pi Compute Module Setup Guide
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- NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 1
NEC Large-Screen Displays Raspberry Pi Compute Module 4 Setup Guide Revision: 210526 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 2
models. Please see "Requirements" on page 9 for a current list of supported displays and Raspberry Pi hardware. Notes: 1. The acts of disclosure, duplication, and modification of part or whole contents in this reference manual without permission are prohibited. 2. The contents of this reference - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 3
are visible on the sides of the screen 34 5.5 To rotate the screen image to portrait orientation 34 5.6 To enable support for the IR Remote receiver using "lirc 35 5.7 To test support for the IR Receiver by outputting raw data 36 5.8 To enable the serial port (UART) to the display and allowing - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 4
5.10 Configuring the Compute Module to shutdown using shutdown signal from the display......... 37 5.11 Reading and setting the display's internal Real Time Clock (RTC) from the OS 38 5.12 Using the display's Watchdog Timer (WDT 39 5.13 Controlling the Compute Module power 40 5.14 Controlling the - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 5
to backup or clone 57 7.21 Debug GPIO lines and overlay assignments 57 7.22 Assign different MAC address to the network interfaces 57 8 Troubleshooting ...58 9 Video CODECs ...63 10 Python Based NEC PD SDK 64 11 Compute Module Configuration Tool for Raspberry Pi OS 66 12 External reference - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 6
Revision History Revision Date 210526 May 26, 2021 Modified by Will Hollingworth Description Initial release ©2021 Sharp NEC Display Solutions, Ltd. Page 6 of 73 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 7
to configure such software with the IR codes for the remote control units being used. o This uses GPIO 18 on the Raspberry Pi. • CEC support between the display and the Raspberry Pi Compute Module. 1 Current display models with multiple LAN ports on the terminal panel: MA431, MA491, MA551, P435 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 8
internal serial connection and the Python based SDK. o This can be used to set the system time when no network connection is available. • Shutdown signal support o The display can signal to the Operating System, running on the Raspberry Pi Compute Module, that the power is about to turn off so the - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 9
, including all RAM and wireless configurations. o Note: "Lite" versions of the Compute Module 4 without onboard eMMC Flash memory are not supported. • Internet connection • LAN hub and standard network cables • Standard USB 2.0 or 3.x cable (USB to USB Micro-B) for programming. ©2021 Sharp - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 10
Lengths of up to 10 feet or 2.5 M can be used with high quality USB cables. • Host PC running either Windows, macOS, or Ubuntu, or a standard Raspberry Pi 1 / 2 / 3 / 4 running Raspberry Pi OS • USB keyboard and mouse for connecting to the display (recommended) • Operating system .img file • - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 11
The OS can be installed after placing the Compute Module in programming boot mode. This allows the Compute Module to appear as a USB device to another "host" PC or Raspberry Pi. The Operating System is then programmed, or "installed", from the host to the Compute Module over USB. After the OS is - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 12
1 Basic Setup and Configuration Steps The following list shows the basic steps that will be performed: 1. Physically install the Raspberry Pi Compute Module 4 into the NEC Compute Module Interface Board and install into the display. See section 2 on page 13 for details. 2. Connect the host PC to the - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 13
2 Installing the Compute Module and NEC Compute Module Interface Board to the Display 1. Disconnect AC power from the display. 2. Install a Compute Module into the connector of the Interface Board. Check that the Compute Module is oriented correctly before fully inserting it into the connector. - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 14
the Compute Module using screws since the heatsink will be used to hold it in place. However, if desired two 2mm or 2.5mm M2 screws [not supplied] can be used. 4. Check the distance between the Interface Board and Compute Module; it should be equal on all sides. Figure 2-3: Check all sides of the - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 15
7. Attach the heatsink using the four M3 screws supplied with the kit. Important: Orientate the heatsink with the slotted hole in the bottom left corner before attaching, as shown in the figure. The thermal conductive sheet will press against the top of the Compute Module. Figure 2-5: Attach the - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 16
Confirm the heatsink is seated correctly by looking at the screw-hole posts on the Interface Board. The two posts on the outside edge should be inserted and flush to the surface of the heatsink. The heatsink rests on top of the two posts closest to the USB and LAN ports connection. Check the - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 17
8. On the side of the display, remove the two screws holding the slot cover in place and then remove the slot cover. Note: • Set the screws aside; they are used in the next step for securing the Compute Module Interface Board in the display. • Do not discard the slot cover. It helps to limit dust - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 18
9. Insert the Interface Board into the slot. Make sure to carefully align and fully insert the Interface Board into the slot and then secure it with the two screws removed in the previous step. Figure 2-8: Insert the Interface Board in the display 10. Reconnect AC power to the display. ©2021 Sharp - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 19
3 Connections and Internal Operation 3.1 USB device connections to the Compute Module The two USB Type-A inputs on the side of the Interface Board are for connecting downstream USB devices, such as a keyboard and mouse, additional storage, external sensors and devices, or a Wi-Fi adapter, to the - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 20
Note: The postion of the Boot Mode switch is only recognized when power is initially applied to the Compute Module. Changing the position of the switch after power is applied to the Compute Module does not affect its operating/boot mode. Important: Remove the cable connected to the USB Micro-B port - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 21
internal 10/100 Mbps interface uses LAN controller (LAN9514) connected to the Compute Module via USB 2.0. It is necessary to enable USB host mode support on the OS to use this interface. See 5.1 Enabling the onboard USB 2.0 controller on page 32 for more information. Important: Both the Gigabit and - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 22
Figure 3.3: LAN Connections Models: MA431 / MA491 / MA551 / P435 / P495 / P555 Figure 3.4: LAN Connections Models: M431 / M491 / M551 / M651 / ME431 / ME501 / ME551 / ME651 ©2021 Sharp NEC Display Solutions, Ltd. Page 22 of 73 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 23
be enabled on the display and in the Operating System on the Compute Module. See Figure 3.4-3: Supported CEC buttons on the NEC IR Remote in CEC MODE 1 on page 25 and Figure 3.4-4: Supported CEC buttons on the NEC IR Remote in CEC MODE 2 on page 25. The buttons used for CEC commands - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 24
Figure 3.5: Using the NEC IR Remote with CEC Figure 3.6: Using other IR Remotes with raw IR signals ©2021 Sharp NEC Display Solutions, Ltd. Page 24 of 73 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 25
buttons on the NEC IR Remote in CEC MODE 1 Figure 3.8: Supported CEC buttons on the NEC IR Remote in CEC MODE 2 The mapping of buttons on the NEC IR Remote to CEC commands has two different - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 26
Note: The Volume Up, Down and Mute buttons will control audio on the display rather than on any media player software running on the Compute Module. These buttons will only operate in CEC mode if a CEC compatible audio amp/receiver is used. 3.5 GPIO The following GPIO are used for signaling between - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 27
The download may need to be unzipped to reveal the .img file. Refer to the following section and the Raspberry Pi website for a list of supported OSs: https://www.raspberrypi.org/downloads/ 4. A text editor that is compatible with UNIX type line endings, such as Notepad++, is highly recommended for - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 28
the LED indicator next to the BOOT MODE switch. The LED should be red when power has been applied to the Interface Board. See the Troubleshooting section for "RPi Boot" is unable to detect the Compute Module on page 58 if the LED indicator does not illuminate. 6. Run the RPiboot application - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 29
drive. If the window stays open and displays only "Waiting for BCM2835/6/7/2711..." then the Compute Module has not been detected. See the Troubleshooting section for "RPi Boot" is unable to detect the Compute Module on page 58. 7. Use the Raspberry Pi Imager, balenaEtcher, or Win32DiskImager tool - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 30
Some settings in the boot files config.txt and cmdline.txt can be modified at this stage. For example, settings to correctly enable the USB 2.0 controller on the Compute Module, set the video output level, and to enable the IR Remote module (lirc) can be made while still in Windows. Navigate to the - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 31
The boot-up sequence for the OS programmed to the Compute Module should be seen on the screen within a few seconds. See the troubleshooting section on page 58 if no boot screen is seen. 10. Check for any system and firmware updates to the OS (Internet connection to the - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 32
5 Miscellaneous Configuration Items Note: Many of the options for the Raspberry Pi OS can be automatically configured using the Compute Module Configuration Tool for Raspberry Pi OS see "Compute Module Configuration Tool for Raspberry Pi " on page 66. 5.1 Enabling the onboard USB 2.0 controller The - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 33
1 2 3 2. Select INPUT SIGNAL INFORMATION. 3. The VIDEO RANGE setting determines how the display will handle the video from the Compute Module. • FULL - Use FULL if the Compute Module is configured to output "full" video in the range 0- 255. This is the recommended configuration since it provides - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 34
When rebooted, confirm the video levels are correct by using the following command again: tvservice -s The output should now show "full" "HDMI CEA (16) RGB full 16:9, 1920x1080 @ 60.00 Hz, progressive" 5.4 To disable overscan (if black bars are visible on the sides of the screen) Either • Run the - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 35
-rpi c. Save the file by pressing CONTROL + o then ENTER. d. Exit Nano by pressing CONTROL + x. Notes: • A reboot is usually necessary to enable support. • If lirc support is not included with the OS, it can be installed using the following: sudo apt install lirc ©2021 Sharp NEC Display Solutions - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 36
• Additional configuration may be required in the OS and application being used. 5.7 To test support for the IR Receiver by outputting raw data Make sure lirc is installed using: sudo apt install lirc Output raw data from the IR receiver - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 37
5. Edit the cmdline.txt file to allow app access to the serial port and prevent bootup information being sent to the display by removing any section with: console=serial0,115200 Important: When the Raspberry Pi boots up, all the bootup information can be sent to the serial port for debugging - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 38
be started when the Operating System starts. This can be accomplished by adding it to the /etc/rc.local file on the system. See the instructions provided in the sample file for more details. 5.11 Reading and setting the display's internal Real Time Clock (RTC) from the OS The Compute Module - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 39
• set_system_to_display_clock.py - Reads the display's internal clock via the internal serial connection and sets the system time accordingly. This file can be added to a startup script on the system, if necessary, to set the OS time from the display if no network connection is available. • - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 40
the display, even under heavy load conditions. The Python SDK includes support for sending the Watchdog Timer reset commands to the display, as set to turn on automatically when the display power is turned on, manually via the OSD, or manually via a command to the display. See section 6.2 on page 43 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 41
5.15 Checking and updating the display firmware version The display firmware version is shown on the SYSTEM MONITOR INFORMATION menu on the OSD. 5.15.1 Update using the NEC Display Firmware Update Tool for Windows The NEC Display Firmware Update Tool is a utility to assist with updating the - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 42
on how to update are displayed. The latest version of the utility and instructions can be downloaded from the following location: https://www.sharpnecdisplays.us/support-and-services/necdisplayfirmwareupdatetool/254 5.15.2 Update display firmware using a USB storage device The latest display - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 43
6 Related OSD Settings 6.1 Slot Compute Module Power Control Power Supply Available options: On / Off Controls power to the Compute Module. Note: The option that is yellow under POWER SUPPLY when opening the POWER CONTROL menu indicates the current power status. If ON is yellow, the power is - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 44
6.3 Slot Compute Module Power Control Reset Available options: (SET command function only) Forces a shutdown and restart of the Compute Module when it does not respond to a shutdown using the POWER BUTTON function. Press the SET button on the IR Remote with this function highlighted. Note: - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 45
the Compute Module if the following settings are made to the Compute Module 4's EEPROM: WAKE_ON_GPIO=0 POWER_OFF_ON_HALT=1 Please see the documentation from Raspberry Pi for instructions on how to change the Compute Module's EEPROM settings. ©2021 Sharp NEC Display Solutions, Ltd. Page 45 of 73 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 46
the GPIO 23 shutdown signal and shut down the operating system accordingly. See Section 5.10 on page 37 for information on configuring the operating system support. ©2021 Sharp NEC Display Solutions, Ltd. Page 46 of 73 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 47
6.10 Slot Compute Module Advanced Setting IR Signal Available options: Enable / Disable Enables or disables the forwarding of IR Remote signals, received from the display's internal remote control sensor and optional external IR sensor, to the Compute Module via GPIO 18. See section 3.4 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 48
This feature can be used to automatically reset the Compute Module if the CPU hangs for some reason. The following two settings control the timeout periods: Start Up Time, Period Time The Python SDK includes sample functions to send the periodic reset command. However, it is up to the developer to - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 49
functions are: 1 (), 2 (), 3 (), 5 (), 6 (), ENT, EXIT MUTE, VOL+, VOL-. • [MODE 2] - the IR Remote CEC button functions are: 0 to 9 and - in the keypad, ENT, EXIT GUIDE, MUTE, SET/POINT ZOOM, VOL+, VOL-, CH/ZOOM+, CH/ZOOM-. See section 3.4 Software control via IR Remote on page 23 for more - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 50
6.17 Input Advanced CEC Search Device Available options: (SET command function only) Pressing SET on the IR Remote will start the process of the display searching for a CEC (Consumer Electronics Control) device on the connection to the Compute Module. If no device is found, confirm that CEC - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 51
Note: A USB Type-A port, and therefore the USB PC SOURCE OSD menu setting, is only applicable on the following display models: MA431 MA491 MA551 P435 P495 P555 Figure 6.1: USB Routing with the Compute Module selected as the source ©2021 Sharp NEC Display Solutions, Ltd. Page 51 of 73 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 52
Figure 6.2: USB Routing with the Internal PC (SDM) selected as the source Figure 6.3: USB Routing with the External PC selected as the source ©2021 Sharp NEC Display Solutions, Ltd. Page 52 of 73 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 53
7 Useful Information and Commands 7.1 To find out the IP address of the Compute Module from a terminal window Use the following command from a terminal window: hostname -I Or ifconfig 7.2 To restart from a terminal window Use the following command: sudo reboot 7.3 To shutdown from a terminal window - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 54
7.6 To add and remove packages from Raspberry Pi OS To add (install) a package: sudo apt install [packagename] To remove (uninstall) a package: sudo apt remove [packagename] For more information visit: https://www.raspberrypi.org/documentation/linux/software/apt.md 7.7 To update the Raspberry Pi To - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 55
7.10 To access an SMB (Windows share) drive from the Raspberry Pi OS desktop Open a File Manger window. Enter a path into the location bar in the following format: smb://sharename/foldername Where "sharename" is the name of the host and "foldername" is the name of the folder being shared. 7.11 To - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 56
7.15 To find a file by name From Raspberry Pi OS use: find / -name example.txt 7.16 To edit a protected system configuration file from the Raspberry Pi OS desktop From a terminal window open the Mousepad editor as sudo: sudo mousepad The file can now be opened, edited, and saved. 7.17 To prevent - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 57
vcgencmd display_power 1 7.20 To create an image of the Compute Module to backup or clone Follow the steps to connect to a Windows host PC and place the Compute Module into BOOT MODE. Run the Win32DiskImager software and instead of selecting Write, select Read to read the drive and store as an .img - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 58
8 Troubleshooting Problem: No video when switching to the Compute Module input Solutions: • on the Compute Module. Note that 4096x2016 @ 60Hz is currently not supported. Use the native resolution of 3840x2160 @ 60Hz or 30Hz instead. Problem: "RPi Boot" is unable to detect the Compute Module If the - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 59
been powered up in boot mode. Running it again will not find the Compute Module. • Disconnect and reconnect the USB cable to the host PC. Problem: Connected USB peripherals do not work Solutions: • Confirm that the USB programming cable to the USB Micro-B connector on the Interface Board has been - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 60
the Compute Module 4 has been written to the Compute Module. • Try a different application to program the Compute Module. Verify the image after writing. Problem: Screen appears gray and blacks aren't true black. Solution: • Most OS distros on the Compute Module are set to output the video range of - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 61
. Follow the previous instructions for checking the "disable_overscan=1" configuration setting in the config.txt file. Problem: 3rd party IR sensor output. • CEC support may be enabled. Normally CEC support must be disabled in order for lirc to work correctly. Problem: Serial communications with the - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 62
Problem: Programming the Compute Module fails after a couple of minutes. Solution: • Confirm the OSD COMPUTE MODULE setting for WDT (Watchdog Timer) is set to DISABLE. ©2021 Sharp NEC Display Solutions, Ltd. Page 62 of 73 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 63
9 Video CODECs The hardware-based video CODECs in the Compute Module 4 are enabled and licensed by default. Please consult the official Raspberry Pi documentation for details. ©2021 Sharp NEC Display Solutions, Ltd. Page 63 of 73 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 64
number o Temperature and fan statuses o Diagnostic information o Operating hours o LAN IP and MAC addresses This makes it very easy to integrate support for remote diagnostics and asset management into any software running on the Compute Module. • Reading and writing almost any configuration setting - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 65
https://github.com/NECDisplaySolutions/necpdsdk Example files are included in the repository. These examples are not included in the package installer. ©2021 Sharp NEC Display Solutions, Ltd. Page 65 of 73 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 66
showing how to use the SDK APIs to communicate with the host display. • Downloading and installing a Python file that provides System Shutdown support by monitoring GPIO 23 - set low by the display to signal a shutdown. • Downloading and installing a Python file that provides hardware-based Watchdog - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 67
https://github.com/NECDisplaySolutions/nec_rpi_config_tool ©2021 Sharp NEC Display Solutions, Ltd. Page 67 of 73 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 68
12 External reference information Main Raspberry Pi website: https://www.raspberrypi.org/ Wikipedia page with listing of other supported operating systems: https://en.wikipedia.org/wiki/Raspberry_Pi#Operating_systems Another listing of Raspberry Pi based operating system distributions: http://elinux - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 69
on the Compute Module accessible and open to use? Currently the header on the NEC Compute Module Interface Board is not populated and not supported. Some GPIO pins are used for display related functions as described elsewhere in this document. What is the communications speed of the internal serial - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 70
by the Interface Board pending regulatory approvals. Is it possible to boot directly to an external USB drive instead of the onboard eMMC memory? Support is being added. See the Compute Module documentation from Raspberry Pi for the latest information on how to enable this feature. ©2021 Sharp NEC - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 71
. See Auto Shutdown in section 6.5 on page 44. Are the NEC displays compatible with the Compute Module 4 Lite? No. The CM Lite requires SD card support. ©2021 Sharp NEC Display Solutions, Ltd. Page 71 of 73 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 72
14 Known Issues Display Firmware • No known issues Video Related • The following video resolutions do not currently display correctly and should be avoided: • 4096x2160 @ 60Hz (use the native 3840x2160 @ 60Hz instead) • 1920x2160 @ 60Hz ©2021 Sharp NEC Display Solutions, Ltd. Page 72 of 73 - NEC ME551-MPi4E | Raspberry Pi Compute Module Setup Guide - Page 73
, and feedback forms specifically relating to using the Raspberry Pi Compute Module together with a supported NEC display model are available here: https://www.sharpnecdisplays.us/support-and-services/raspberrypi/244 The latest display firmware is available from the following location: https://www
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NEC Large-Screen Displays
Raspberry Pi Compute Module 4
Setup Guide
Revision: 210526