CM4-IO-BASE-C
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Overview
Introduction
As the mini IO board of the Raspberry Pi Compute Module 4, CM4-IO-BASE-C is a baseboard that can be used with the Raspberry Pi Compute Module 4. It supports direct connection to LCD interfaces, facilitating integrated design and quick embedding in project applications.
Version Description
V1 version
V2 version (all future updates will be based on this version, V1 version is no longer updated)
Precautions
1. Do not plug or unplug any device other than USB and HDMI when the device is powered on
2. The FAN only supports 5V fans. 12V is not supported, check the fan voltage before connecting.
3. Support LCD interface direct connection, no DSI interface.
4. The Type C interface can be used as a power supply or as a USB SLAVE interface for flashing images.
5. In order to ensure the normal power supply of CM4, please do not connect other devices when using the Type C interface to flash the image.
6. When CM4 is in normal use, it needs to provide a 5V 2A or higher power supply for CM4. Otherwise, problems such as automatic shutdown and frequency reduction may occur.
7. When using the M.2 interface, please use the matching screws. Using screws of other lengths may cause the CM4 core to be damaged by the screw.
8. The module has no power protection circuitry, please do not short-circuit the power supply.
9. USB2.0 is disabled by default. To enable it, add dtoverlay=dwc2,dr_mode=host to config.txt.
10. This expansion board does not support POE functionality.
Dimensions
CM4-IO-BASE-C-V1
CM4-IO-BASE-C-V2
Compute Module 4 core board
Onboard Resources
CM4-IO-BASE-C-V1
| No. | Name | Description | |
| 1 | CM4 interface | Compatible with all versions of Compute Module 4 | |
| 2 | Power/flashing interface | 5V/2.5A power supply, can also be used as an eMMC flashing interface | |
| 3 | LCD interface | 40PIN LCD display interface for direct connection to 70H-1024600 series displays | |
| 4 | FAN interface | Connect to a cooling fan, supports speed control and speed measurement, only supports 5V fans | |
| 5 | CAM interface | Dual MIPI CSI camera interface | |
| 6 | HDMI0 interface | HDMI interface, supports 4K 30fps output | |
| 7 | USB 2.0 interface | 2 USB 2.0 interfaces, supports various USB devices | |
| 8 | Gigabit Ethernet port | RJ45 Gigabit Ethernet port, supports 10/100/1000M network access | |
| 9 | M.2 interface indicator light | Indicates the working status of the interface | |
| 10 | PWR indicator light | Indicates the power status of Raspberry Pi | |
| 11 | Status Indicator | Indicates the working status of the Raspberry Pi | |
| 12 | BOOT | Jumper cap connected: CM4 USB Type-C boot on startup Jumper cap not connected: eMMC or TF card boot on startup | |
| 13 | 40PIN GPIO interface | Convenient for connecting various HAT modules | |
| 14 | Micro TF slot | For inserting a TF card with pre-installed system, only for the Lite version | |
| 15 | FE1.1S | USB HUB chip, USB port 1 to 4 expansion | |
| 16 | M.2 interface | Suitable for NVME SSD or communication modules that support PCIE M.2 interface | |
| 17 | RTC chip | PCF85063 chip can be used for RTC wake-up, shutdown, restart, or other functions | |
| 18 | RTC interrupt pin switching | PI-RUN: RTC triggers interrupt for CM4 restart GN-EN: RTC triggers interrupt for CM4 shutdown D4: RTC triggers interrupt for D4 pin trigger | |
| 19 | RTC battery holder | Supports CR1220 button cell |
CM4-IO-BASE-C-V2
| No. | Name | Description | |
| 1 | CM4 interface | Compatible with all versions of Compute Module 4 | |
| 2 | Power/flashing interface | 5V/2.5A power supply, can also be used as an eMMC flashing interface | |
| 3 | LCD interface | 40PIN LCD display interface for direct connection to 70H-1024600 series displays | |
| 4 | FAN interface | Connect to a cooling fan, supports speed control and speed measurement, only supports 5V fans | |
| 5 | CAM interface | Dual MIPI CSI camera interface | |
| 6 | HDMI0 interface | HDMI interface, supports 4K 30fps output | |
| 7 | USB 2.0 interface | 2 USB 2.0 interfaces, supports various USB devices | |
| 8 | Gigabit Ethernet port | RJ45 Gigabit Ethernet port, supports 10/100/1000M network access | |
| 9 | M.2 interface indicator light | Indicates the working status of the interface | |
| 10 | LED indicator light | Red: Indicates the power status of the Raspberry Pi (PWR) Green: Indicates the operating status of the Raspberry Pi (ACT) | |
| 11 | BOOT | Jumper cap connected: CM4 USB Type-C boot on startup Jumper cap not connected: eMMC or TF card boot on startup | |
| 12 | 40PIN GPIO interface | Convenient for connecting various HAT modules | |
| 13 | Micro TF slot | For inserting a TF card with pre-installed system, only for the Lite version | |
| 14 | FE1.1S | USB HUB chip, USB port 1 to 4 expansion | |
| 15 | M.2 interface | Suitable for NVME SSD or communication modules that support PCIE M.2 interface | |
| 16 | RTC chip | PCF85063 chip can be used for RTC wake-up, shutdown, restart, or other functions | |
| 17 | RTC interrupt pin switching | PI-RUN: RTC triggers interrupt for CM4 restart GN-EN: RTC triggers interrupt for CM4 shutdown D4: RTC triggers interrupt for D4 pin trigger | |
| 18 | RTC battery holder | Supports CR1220 button cell |
Precautions
It is forbidden to unplug and plug any device other than USB and network port when it is charged
Image Flashing
Click here for EMMC version
Click here for LITE version
USB2.0
The USB port is disabled by default on the CM4 to save power. If it needs to be enabled, you need to add the following to the config.txt file:
dtoverlay=dwc2,dr_mode=host
Then reboot it.
If you use the latest Raspberry Pi OS (image after October 30, 2021), USB2.0 defaults to OTG mode, and CM4 will report an error:
config failed, hub doesn't have any ports! (err -19)
However, USB can still be used. If you want to remove this error, remove otg_mode=1 in [cm4] of config.txt, and add dtoverlay=dwc2, dr_mode=host (if you don't add it, USB can not be recognized).
M.2
The M.2 interface type is M KEY, which only supports PCIE channel devices (including NVME solid-state, etc.) and does not support SATA hard drives.
It supports some adapter cards and takes the PCIE channel. The official Raspberry Pi image of some devices cannot be driven, and the kernel needs to be recompiled.
RTC FAN
RTC (PCF85063a) is on I2C-10, the address is 0x51 (7-bit address)
RTC
sudo nano /boot/config.txt #Add at the end dtparam=i2c_vc=on dtoverlay=i2c-rtc,pcf85063a,i2c_csi_dsi #Add # before dtparam=audio=on #dtparam=audio=on #Save, exit, and reboot sudo reboot
Hwclock
Synchronize system clock -> hardware clock.
sudo hwclock -w
Synchronize hardware clock -> system clock.
sudo hwclock -s #Need to turn off the network, or disable network time synchronization, otherwise it will be changed back
Set the hardware clock time:
sudo hwclock --set --date="9/8/2021 16:45:05"
View the hardware clock.
sudo hwclock -r
Show version information.
sudo hwclock --verbose
FAN
The fan PWM pin is connected to the GPIO18
LCD Port
Interface Connection
Screen touch (USB): USB3
Backlight enable (BL_EN): GPIO17
Backlight adjustment (BL_PWM): GPIO19
Schematic Diagram
CSI
CM4-IO-BASE-C has only CSI camera interface and no DSI display interface
New Version (Bullseye)
If you use the latest Raspberry Pi OS (Bullseye):
#The new system uses dual cameras #Remove camera_auto_detect=1 in config.txt #camera_auto_detect=1 #Add dtoverlay=imx219,cam1 dtoverlay=imx219,cam0 #Where imx219 is the camera sensor model and other sensors are supported dtoverlay=ov5647,cam0 dtoverlay=imx219,cam0 dtoverlay=ov9281,cam0 dtoverlay=imx477,cam0 dtoverlay=imx519,cam0 #Then reboot reboot #Open camera libcamera-hello -t 0 or libcamera-hello #Other instructions: #Check if the camera is detected libcamera-hello --list-cameras #Open the corresponding camera, preview for 5 seconds libcamera-hello --camera 1 libcamera-hello --camera 0 #Take photos libcamera-jpeg -o test.jpg #Shoot video libcamera-vid -t 10000 -o test.h264 #You can add --camera to specify the camera #-t <duration> option allows the user to choose how long the window is displayed in milliseconds
For more commands, you can click here.
Old Version (Buster)
Configure Files
CSI is disabled. When using the camera, three I2C devices, I2C-10, I2C-11, and I2C-0 will be occupied.
The boot process is as follows:
wget https://files.waveshare.com/upload/7/75/CM4_dt_blob_Source.zip unzip -o CM4_dt_blob_Source.zip -d ./CM4_dt_blob_Source sudo chmod 777 -R CM4_dt_blob_Source cd CM4_dt_blob_Source/ sudo dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp0-double_cam.dts #If you need to restore, delete the corresponding dt-blob.bin: sudo rm -rf /boot/dt-blob.bin #Execution is complete, turn off the power and restart CM4
Connect to the camera:
1: Please make sure it is connected under powering off.
2: Connect to the power.
3: The display will be booted after waiting for a few seconds.
4. If it fails to boot, check whether /boot/dt-blob.bin exists, and reboot it if it exists.
The camera needs to run raspi-config, select Interfacing Options -> Camera -> Yes -> Finish -> Yes, reboot the system, open enable camera, and then restart to save the changes.
Test the Raspberry Pi camera.
Check the screen of the first connected camera:
sudo raspivid -t 0 -cs 0
Check the screen of the second connected camera:
sudo raspivid -t 0 -cs 1
- Note: If using a DSI interface display there will be an HDMI disabled, even if just compiling the corresponding file without connecting a DSI screen.
- Connecting either HDMI port will allow output of an image, regardless of which HDMI port is used. If two HDMI screens are connected, only HDMI0 has an image output.
- If you want to enable both HDMI ports, delete the dt-blob.bin file with the following command:
sudo rm -rf /boot/dt-blob.bin
- And then reboot it.
Please refer to Raspberry Pi manual.
Resources
Document
Schematic Diagram
3D Diagram
Software
- RPiBoot Setup
- Panasonic SDFormatter-Formatting software
- Win32DiskImager-Image download software
- Putty
Related Link
FAQ
b) Check if the /boot/dt-blob.bin file exists. If it exists and cannot be used, please delete it
Support
Technical Support
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