Compute Module 4

Raspberry Pi Compute Module 4 IO Board

CM4-IO-BOARD-CASE-A

Compute Module 4

Product description

I am the 4th generation IO board of the Raspberry Pi Compute Module. The Compute Module 4 IO Board is a baseboard officially released by the Raspberry Pi that can be used with the Raspberry Pi Compute Module 4. It can be used as the development system of the Compute Module 4 and as Embedded boards are integrated into end products, or systems can be created quickly using off-the-shelf components such as Raspberry Pi expansion boards and PCIe modules. Its interface is concentrated on the same side, which is convenient for users to use.

Product dimension

Compute Module 4 IO Board

For more description, please visit: module 4_IO board

Notes

Do not plug or unplug any device while it is powered on.

Writing Image

USB2.0

The USB port is disabled by default on the CM4 to save power. If you need to start, you need to add the following to the config.txt file:

 dtoverlay=dwc2,dr_mode=host

After restarting:

If you use the latest Raspberry Pi OS (image after October 30, 2021) USB2.0 is OTG mode by default, 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 (USB cannot be recognized without adding it).

PCIe Gen 2 x 1

PCle sockets are designed to accept standard PC PCle cards. You should make sure you have an OS driver for your card.
The PCle link has been successfully used with NVMe drives via a passive PCle adapter.
Note: PCle interface does not support MSI-X. Typical PCle devices will fall back to MSI.

RTC FAN

This extended version only supports 12V.

Note: Please connect the fan before turning on the power of the base board 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 actually 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

When powered on, the fan will spin for 1 second, then stop for 2 seconds, and then spin again, this is a normal phenomenon
There is no official configuration method for the fan currently, there is a third-party configuration method: https://github.com/neg2led/cm4io-fan
This method is published by a third party, and we are not responsible for any problems!

sudo apt-get install dkms 
mkdir -p ~/src
cd ~/src
git clone https://github.com/neg2led/cm4io-fan.git
cd cm4io-fan
sudo chmod 777 install.sh
sudo  ./install.sh

#If an error message appears: Your kernel headers for kernel 5.XX.XX-v7l+ cannot be found at
#After rebooting the device, you can execute it:

#The following is the description of config.txt
#############################
Name:   cm4io-fan
Info:   Raspberry Pi Compute Module 4 IO Board fan controller
Load:   dtoverlay=cm4io-fan,<param>[=<val>]
Params: minrpm             RPM target for the fan when the SoC is below 
                            mintemp (default 3500)
        maxrpm              RPM target for the fan when the SoC is above
                            maxtemp (default 5500)
        midtemp             Temperature (in millicelcius) at which the fan
                            begins to speed up (default 50000)
        midtemp_hyst        Temperature delta (in millicelcius) below mintemp
                            at which the fan will drop to minrpm (default 2000)
        maxtemp             Temperature (in millicelcius) at which the fan 
                            will be held at maxrpm (default 70000)
        maxtemp_hyst        Temperature delta (in millicelcius) below maxtemp
                            at which the fan begins to slow down (default 2000)
#############################

Or directly refer to the following:

dtoverlay=cm4io-fan,minrpm=500,maxrpm=5000,midtemp=45000,midtemp_hyst=2000,maxtemp=50000,maxtemp_hyst=2000

The fan will start to accelerate when temperature is higher than 45 degrees Celsius, and will up to the highest speed when higher than 50 degrees Celsius.

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_Source.zip
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 execute
sudo dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp1-double_cam.dts
# In the use of any DSI, HDMI1 no image output, even if you do not connect the DSI screen as long as the corresponding file compiled, that HDMI1 no output
# If you need to restore, delete the corresponding dt-blob.bin can be: sudo rm -rf /boot/dt-blob.bin 
#Execution is complete, power off and restart CM4

New Version (Bullseye)

Camera Config

Execute the following commands to edit "/boot/config.txt" file.
```
sudo nano /boot/config.txt
```
Block or remove the automatic camera detection statement:
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

If you are using the official Raspberry Pi camera, and only one camera access, no need to set the config file.
CM4-NANO - only CAM0 is used, so you only need to add "dtoverlay=imx219,cam0".

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

sudo reboot

Camera Test

Enter the camera detection command, you can see that the camera has been checked by now.
```
libcamera-hello --list-cameras
```
Display the camera screen on the desktop.

libcamera-hello -t

Taking photos.
```
libcamera-jpeg -o test.jpg
```
Record a video of 10s.
```
libcamera-vid -t 10000 -o test.h264
```

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

Official Manual

Program

Sample Program Unofficial Example

Source files and sample demos

FAQ

Question:What should I do if the I2C address of the RTC/FAN controller cannot be searched using i2cdetect -y 10?

Answer:

a) Check whether dtparam -audio - on is blocked in /boot/config.txt

b) Check whether the /boot/dt-blob.bin file exists, if it cannot be used, delete it.

Support

Technical Support

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Compute-Module-4

Contents

Compute Module 4

Product description

Product dimension

Notes

Writing Image

USB2.0

PCIe Gen 2 x 1

RTC FAN

RTC

How to use Hwclock

Fan

CSI DSI

Configuration file

New Version (Bullseye)

Camera Config

Camera Test

Old Version (Buster)

Camera Config

Camera Test

Resource

Official Manual

Program

FAQ

Question:What should I do if the I2C address of the RTC/FAN controller cannot be searched using i2cdetect -y 10?

Support