Overview

This is an IO board for evaluating the Raspberry Pi CM4 or being integrated into end products. the board feature PoE function, it can be used for all variants of CM4.

Precautions

1. DO NOT hot-plug any devices except the USB and HDMI.
2. Please check the fan voltage before connection, support 5V and 12V. The default connection is 5V and you can modify the FAN_VCC jump cap to switch.
3. Micro USB is used as a USB SLAVE interface to write images, not as an OTG interface.
4. Provide 5V 1.5A for CM4 to ensure that it is in normal use. Otherwise, there may be problems such as automatic shutdown, frequency reduction, and so on.
5. Onboard 4-ch USB 3.2 Gen1 connector by default.
6. When using the POE function, check whether the switch supports PoE for the 802.3af network standard.
7. When POE is required, connect the POE jumper cap to the EN position.
8: Two DISP interfaces cannot be used together by default.

Dimension

Compute_Module 4 POE Board

Compute_Module 4

What's on board

Special Function Pin Description

Note

Do not plug or unplug any device while the base board is powered on.

Writing Image

• Write Image for Compute Module Boards eMMC version
• Write Image for Compute Module Boards Lite version

RTC FAN

• Note: Please connect the fan before turning on the power of the baseboard and then complete the test. Please do not connect the fan after the baseboard is powered on, because the fan control chip has been powered on, otherwise, the chip will be burned!
• Note: Before connecting, please confirm whether the rated voltage of the fan is consistent with the voltage connected to the fan.

Please note that DSI and CSI are prohibited when using RTC.
I2C-10 is used by default.

RTC (PCF85063a) on i2c-10, address is 0 x 51 (7-bit address)
FAN (EMC2301) on i2c-10, address is 0 x 2f (7-bit address)

If you need to add it to your program instead of the kernel, you can refer to the C and Python demo reference click here

RTC

sudo nano /boot/config.txt
 #Add the following lines at the end
 dtparam=i2c_vc=on
 dtoverlay=i2c-rtc,pcf85063a,i2c_csi_dsi
 #Add # in front of dtparam=audio=on
 #dtparam=audio=on
 #Save and exit, restart
 sudo reboot

How to use Hwclock

Synchronize system clock to hardware clock:

sudo hwclock -w

Synchronize hardware clock to system clock:

sudo hwclock -s
 #The network or the NTP needs to be closed, otherwise it will be changed back.

Set the hardware clock time:

sudo hwclock --set --date="9/8/2021 16:45:05"

View hardware clock:

sudo hwclock -r

Display version information:

sudo hwclock --verbose

Fan

1: Check if the kernel version is higher than or equal to 6.1.31.

uname --all

2: Add the following content at config.txt:

dtoverlay=i2c-fan,emc2301,i2c_csi_dsi,midtemp=45000,maxtemp=65000

3: For more parameters, you can refer to this link

Troubleshooting

1: After configuration, you can use the command "i2cdetect -y 10" to check whether the configuration is valid, and the valid I2C address should be UU without digits.

2: RTC value is not accurate, or an invalid prompt appears, check whether the RTC battery is connected and whether the voltage of the RTC battery is normal.

3: All configurations need to be rebooted after being added to take effect.

4: If the fan does not rotate after adding the fan driver, you can press "1" to troubleshoot and check whether the configuration is effective. If it is valid, then you can check whether the kernel version is higher or equal to 6.1.31 (uname --all). If the version is lower than 6.1.31, this kernel cannot work. For more details, you can refer to this link.

CSI DSI

Configuration file

CSI and DSI are disabled by default. When using the camera and DSI, it will occupy three I2C devices: I2C-10, I2C-11, and I2C-0.

• Open a terminal and run the following commands:
  

sudo apt-get install p7zip-full -y
wget https://files.waveshare.com/upload/7/75/CM4_dt_blob.7z
7z x CM4_dt_blob.7z -O./CM4_dt_blob
sudo chmod 777 -R CM4_dt_blob
cd CM4_dt_blob/
# If using two cameras and DSI1, please execute:
sudo dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp1-double_cam.dts
# When using any DSI, there is no image output on HDMI1. Even if you do not connect a DSI screen, as long as the corresponding file is compiled, there will be no output on HDMI1.
# To restore it, simply delete the corresponding dt-blob.bin file: sudo rm -rf /boot/dt-blob.bin
#Execution is complete, power off and reboot CM4

New Version (Bullseye)

Camera Config

1. Execute the following commands to edit "/boot/config.txt" file.

   sudo nano /boot/config.txt

2. Block or remove the automatic camera detection statement:
3. 
   
4. Add the driver of the camera you are using, here I take IMX219 as an example and connect it to CAM0, and attach the adapter.
   

   
   

   Model	CAM0 Set Sentence	CAM1 Set Sentence
   OV9281	dtoverlay=ov9281,cam0	dtoverlay=ov9281,cam1
   IMX290/IMX327	dtoverlay=imx290,clock-frequency=37125000,cam0	dtoverlay=imx290,clock-frequency=37125000,cam1
   IMX378	dtoverlay=imx378,cam0	dtoverlay=imx378,cam1
   IMX219	dtoverlay=imx219,cam0	dtoverlay=imx219,cam1
   IMX477	dtoverlay=imx477,cam0	dtoverlay=imx477,cam1
   IMX708	dtoverlay=imx708,cam0	dtoverlay=imx708,cam1

• If you are using the official Raspberry Pi camera and only one camera is connected, there is no need to set the config file. If it is not an official camera, set the "dtoverlay" statement without the "cam" suffix.
• CM4-NANO - only CAM0 is used, so you only need to add "dtoverlay=imx219,cam0".
4. Press Ctrl+o to save the file and then press Enter.



5. Ctrl+x to exit the editor.
6. Reboot the Raspberry Pi.

sudo reboot

Camera Test

1. Enter the camera detection command, you can see that the camera is detected by now.
   

   libcamera-hello --list-cameras
   

   
   

2. Display the camera screen on the desktop.

libcamera-hello -t

3. Taking photos.

   libcamera-jpeg -o test.jpg
   

4. Record a video of 10s.

   libcamera-vid -t 10000 -o test.h264
   

Other Commands:
Check whether the camera is detected:

libcamera-hello --list-cameras

Open the corresponding cameras:

libcamera-hello  --camera 1
libcamera-hello  --camera 0

Take a photo:

libcamera-jpeg -o test.jpg
#Add --camera to specify a camera 

Old Version (Buster)

Camera Config

1. Execute the following command to enter the Raspberry Pi configuration.


sudo raspi-config

2. Choose Interfacing Options and enter.

3. Choose Camera:

4. Choose to enable the camera interface.

5. The system prompts as follows:

6. Back to the main interface, select Finish.

7. Reboot the system.






Camera Test

raspistill -o image.jpg

• Test the recording function:

raspivid -o video.h264 -t 10000

• • Where -t 10000 means recording for 10 seconds, users can adjust according to their own needs.
  • Please refer to CSI.
    

Resource

Document

• Schematic
• CSI Camera Reference
• DSI Display Reference
• Raspberry Pi Compute Module 4 IO Board Brief
• Raspberry Pi Compute Module 4 IO Board Datasheet

3D Drawing

• 3D Drawing
  

Demo codes

• Dt files
  
• CM4_Code

Software

• putty
• RPiboot_Setup
  
• Panasonic_SDFormatter-Formatting SD card
• Win32DiskImager-Writing SD card

FAQ

Support

Email: services01@spotpear.com