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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
The CM4-IO-BASE-C is a mini base board for the Raspberry Pi Compute Module 4 (CM4). It provides direct LCD connectivity, Gigabit Ethernet, USB 2.0, an M.2 slot, RTC and fan control.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL23228 WSAL23228 – Mini Base Board (C) Designed for Raspberry Pi Compute Module 4]
* [https://shop.jw-tech.eu/p/WSAL23743 WSAL23743 – Mini-Computer Advanced Version, Designed for Raspberry Pi Compute Module 4]
* [https://shop.jw-tech.eu/p/WSAL23926 WSAL23926 – Mini-Computer Advanced Version, Designed for Raspberry Pi Compute Module 4]
* [https://shop.jw-tech.eu/p/WSAL23927 WSAL23927 – Mini-Computer Advanced Version, Designed for Raspberry Pi Compute Module 4]

== Technical overview ==
* V1 and V2 versions exist; all future updates are based on V2, while V1 is no longer updated
* Supports direct connection of 40-pin LCDs from the 70H-1024600 series
* Gigabit Ethernet RJ45 port supporting 10/100/1000 Mbps
* Two USB 2.0 ports; disabled by default and enabled via config.txt
* M.2 slot supports only PCIe devices such as NVMe SSDs, not SATA drives
* RTC chip PCF85063 on I2C-10 with address 0x51
* Fan connector supports 5V fans only; 12V fans are not supported
* BOOT jumper selects boot source: connected = USB Type-C boot, removed = eMMC or TF card boot
* No DSI interface; only CSI camera interfaces are provided
* This expansion board does not support PoE functionality

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
dtoverlay=dwc2,dr_mode=host
dtparam=i2c_vc=on
dtoverlay=i2c-rtc,pcf85063a,i2c_csi_dsi
sudo hwclock -w
sudo hwclock -s
sudo hwclock --set --date="9/8/2021 16:45:05"
sudo hwclock -r
libcamera-hello -t 0
libcamera-hello --list-cameras
libcamera-hello --camera 1
libcamera-jpeg -o test.jpg
libcamera-vid -t 10000 -o test.h264
sudo raspivid -t 0 -cs 0
sudo raspivid -t 0 -cs 1
sudo rm -rf /boot/dt-blob.bin
</syntaxhighlight>

== Notes and version constraints ==
* USB 2.0 is disabled by default; without dtoverlay=dwc2,dr_mode=host, USB devices will not be recognized
* With newer Raspberry Pi OS images (from October 2021), the error 'config failed, hub doesn't have any ports! (err -19)' may appear; remove otg_mode=1 and add the USB overlay
* M.2 slot supports only PCIe devices; some official images require recompiling the kernel
* When using the M.2 interface, use matching screws; incorrect lengths can damage the CM4 core
* No power protection circuitry is present; avoid short circuits
* While powered on, only USB and network connectors may be unplugged
* Normal operation requires a 5V/2A power supply; otherwise automatic shutdown or clock throttling may occur

== Source and revision record ==
* [https://www.waveshare.com/wiki/CM4-IO-BASE-C CM4-IO-BASE-C - Waveshare Wiki]
* Source revision: 109077
* Captured: 2026-09-04T02:43:54+00:00
* SHA-256: <code>34be761da6212ee0bcfb9d0fff38cdd7a59f88a661e1ad82408e3616ac0dd03e</code>

WSAL23228 – CM4-IO-BASE-C/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex