Compute Module 4 PoE Board
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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
| No. | Component | Description | |
| 1 | CM4 connector | Suitable for all variants of Compute Module 4 | |
| 2 | DC power port | 7~36V DC wide voltage supply, 24W or higher power supply is recommended. | |
| 3 | Gigabit Ethernet RJ45 with PoE support | 10/100M auto-negotiation, for connecting router or switch with PoE function | |
| 4 | USB SLAVE Interface | Writing emmc for Compute Module 4 | |
| 5 | USB3.2 Interface | 4 x USB 3.2 Gen1 interface for USB devices. | |
| 6 | HDMI Interface | Dual HDMI ports for dual 4K 30fps output. | |
| 7 | RTC | RTC battery holder, for installing CR2032 batteries, allows RTC-related functions like wakeup, shutdown, reboot, and more | |
| 8 | CAM | 2x MIPI CSI camera connectors. | |
| 9 | DISP | 2x MIPI DSI display connectors. | |
| 10 | FAN | Fan header, support PWM Fan. | |
| 11 | FAN Power Select | 5V or 12V voltage to drive the fan | |
| 12 | IO-VREF/PoE selection | IO-VREF: CM4 IO logic level: 3.3V or 1.8V PoE: enable (EN) or disable (DIS) | |
| 13 | 40PIN GPIO header | For connecting Raspberry Pi HATs | |
| 14 | CAM0 and DISP0 I2C bus | fit the jumpers when using CAM0 or DISP0 | |
| 15 | Misc configurations | Special function pins | |
| 16 | Dual LED indicators | red: Raspberry Pi power indicator green: Raspberry Pi operating status indicator | |
| 17 | TF card slot (bottom side) | Insert a TF card with a pre-flashed system, to start up Compute Module 4 Lite |
Special Function Pin Description
| Name | Description | |
| 1 | PI BOOT | Low level, Pi booted from USB SLAVE port |
| 2 | EEPROM WP | Low level, prevents EEPROM from being overwritten |
| 3 | IP1/0 | CM4 board MXL7704 AN1/0 pin |
| 4 | VADC COMP | Composite video output |
| 5 | ETH IN | ETH simultaneous signal |
| 6 | PI_EN | Synchronized with PI_RUN signal |
| 7 | PI_GLOBAL_EN | CM4 onboard MXL7704 power enable pin, disabled for low level |
| 8 | PI_RUN | CM4 status indication, high means power on, force pull low to force restart CM4 |
| 9 | WIFI_EN | WIFI enable, low level disable, enabled when not connected |
| 11 | BT_EN | Bluetooth enable, low disable, enabled when not connected |
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 flashed!
- 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 -a
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 -a). If the version is lower than 6.1.31, this kernel cannot work. For more details, you can refer to this link.
CSI DSI
CSI DSI
New Version (Bookworm)
The DSI screen is 800x480 resolution screen by default, please refer to the corresponding WIKI for other resolution screens
When using the official base board Compute Module 4 IO Board, note that the J6 jumper cap needs to be connected
DSI
#Add the following to the config.txt file: sudo nano /boot/firmware/config.txt #DSI0 (V1~V3) dtoverlay=vc4-kms-dsi-7inch,dsi0 #DSI1 (V4) dtoverlay=vc4-kms-dsi-7inch,dsi1
CSI
| Mode | CAM0 setup statement | CAM1 setup statement |
|---|---|---|
| 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 |
| IMX296 | dtoverlay=imx296,cam0 | dtoverlay=imx296,cam1 |
| IMX708 | dtoverlay=imx708,cam0 | dtoverlay=imx708,cam1 |
sudo reboot
Note:
1. The single-port camera can only work on CAM0, that is, it is not possible to use CAM1 port alone. But you can use the CAM0 port alone, or connect the dual cameras 2. If the device is recognized, and the startup prompt "Camera frontend has timed out!" appears, please update "sudo rpi-update"
Test Camera
- Enter the camera detection command, and you can see that the camera has been detected
libcamera-hello --list-cameras
- Display the camera screen to the desktop
libcamera-hello -t 0
- Take a photo
libcamera-jpeg -o test.jpg
- Record a 10s video
libcamera-vid -t 10000 -o test.h264
Other commands
Check if the camera is detected
libcamera-hello --list-cameras
Open the corresponding camera
libcamera-hello --camera 1 libcamera-hello --camera 0
Take a photo
libcamera-jpeg -o test.jpg #You can add --camera to specify the camera
#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.
- 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.
- To enable two HDMI ports, remove the configuration from config.txt:
- And then reboot it.
Please refer to Raspberry Pi manual.
Old System Version (Buster and Bullseye)
Configure Files
CSI and DSI are disabled by default. When using the camera and DSI, three I2C devices, I2C-10, I2C-11, and I2C-0 will be occupied.
Booting is performed 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/ #Execute (for version V1~V3) sudo dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp0-double_cam.dts #Execute (for version V4) sudo dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp1-double_cam.dts Add the following to the config.txt file: sudo nano /boot/config.txt Change dtoverlay=vc4-kms-v3d to dtoverlay=vc4-fkms-v3d #When using any DSI, HDMI1 has no image output, even if you are not connected to the DSI screen, as long as you compile the corresponding file, then HDMI1 will have no output #If you need to restore, delete the corresponding dt-blob.bin: sudo rm -rf /boot/dt-blob.bin #After execution, turn off the power and restart
Record Test
Connect to the camera and the DSI display:
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.
Old Version (Buster)
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
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
Demo codes
Software
FAQ
a) Check if dtparam -audio -on is blocked in /boot/config.txt.
b) Check if the /boot/dt-blob.bin file exists, if it does, please delete it.
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