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Revision as of 11:53, 14 July 2021
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Overview
CM4-DUAL-ETH-BASE is a base board that can be used with Raspberry Pi Compute Module 4, and supports 7~12V DC power supply, onboard three USB3.2, dual Gigabit Ethernet ports and it is suitable for scenarios that require multiple network ports, such as soft routing.
Precautions for use
1: Do not plug and unplug any device except USB and HDMI when powered on.
2: Confirm the fan voltage before connecting, support 5V and 12V, connect 12V by default, please modify the resistance of FAN_VCC when switching.
3: The Type C interface is only used as the USB SLAVE interface to program the image, and cannot be used as a power supply.
4: In order to ensure the normal power supply of CM4, please do not connect other devices when using the Type C interface to burn the image.
5: When CM4 is in normal use, it needs to provide at least 12V 1.5A power supply. Otherwise, there may be problems such as automatic shutdown, frequency reduction and so on.
6: For Opwenwrt, see the instructions for use.
7: This expansion board does not support POE function.
Version
Version: CM4-DUAL-ETH-BASE V3 (20220527)
- 1: Add common mode inductance to improve EMI. (CE certified)
Version: CM4-DUAL-ETH-BASE V2 (20220518)
- 1: DSI interface changed from DSI0 to DSI1
- 2: Correct the mismatch between screen printing and network in RTC SYSTEM and other parts
Version: CM4-DUAL-ETH-BASE V1
- Initial version
Dimension
CM4-DUAL-ETH-BASE
Compute_Module 4
What's on Board
No. | Component | Description | |
1 | CM4 socket | Suitable for all variants of Compute Module 4 | |
2 | 40PIN GPIO | Connect HAT module | |
3 | Gigabit Ethernet connector | Dual RJ45 Gigabit Ethernet ports, support 10/100/1000M network access ETHERNET 0: CM4 native network port ETHERNET 1: USB extended network port | |
4 | USB 3.2 | 3-way USB 3.2 Gen1 interface, support various USB device insertion | |
5 | HDMI | Dual HDMI ports, support dual 4K 30fps output | |
6 | CAM | Dual MIPI CSI camera interface | |
7 | DC Power | 7~36V DC wide voltage power supply | |
8 | Dual LED | Red light: Raspberry Pi power indicator Green light: Raspberry Pi working status indicator | |
9 | Micro SD | Used to connect the Micro SD card with the system to start Compute Module 4 Lite | |
10 | FAN | Convenient access to cooling fans, support speed regulation and speed measurement | |
11 | DISP | MIPI DSI Display interface - DISP1 | |
12 | USB SLAVE | Compute Module 4 eMMC Version can burn the system image through this interface | |
13 | RTC Battery connector | Can be connected to CR1220 button battery | |
14 | RTC Interrupt pin switching | PI-RUN: RTC trigger interrupt CM4 restart GN-EN: RTC trigger interrupt CM4 power off D4: RTC trigger interrupt D4 pin | |
15 | IO-VREF selection | CM4 IO logic voltage switch 3.3V or 1.8V | |
16 | FAN power supply options | can choose 5V or 12V voltage to drive the fan | |
17 | System function switch | BT_DIS: Bluetooth disabled, only for CM4 version with antenna WiFi_DIS: WiFi disabled, only for CM4 version with antenna WP_DIS: Start mode switch, only For use without EMMC boot or SD boot | |
18 | RTC/FAN I2C bus selection | SDA0/SCL0: I2C-10 and CSI/DSI shared GPIO3/2: I2C-1 and 40PIN shared | |
19 | RTL8153 | USB Gigabit LAN Chip | |
20 | EMC2301 | Fan controller, control fan speed, measure fan speed | |
21 | VL805 | USB 3.0 HUB |
Precautions
Do not plug or unplug any device while it is powered on.
Writing Image
- Write Image for Compute Module Boards eMMC version
- Wrote Image for Compute Module Boards Lite version
RS485/RS232
It is closed by default. If you need to open it, you need to add content in config.txt:
sudo nano /boot/config.txt
dtoverlay=uart3 dtoverlay=uart5
RS232 occupies GPIO5/GPIO4 (BCM code 4/5), device number ttyAMA1.
RS485 occupies GPIO13/GPIO12 (BCM code 13/12), device number ttyAMA2.
Note: There is an RS485 serial port switch on the back, which can be switched to GPIO14/GPIO15.
USB2.0
The USB interfaces are default disabled in CM4, you need to enable it by adding the following lines: the config.txt.
dtoverlay=dwc2,dr_mode=host
It will take effect after restart.
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).
RTC FAN
- Note: Please connect the fan before turning on the power of the expansion board and then complete the test. Please do not connect the fan after the expansion board has been powered on, that is, the fan control chip has been powered on, otherwise the chip will be burned!
- Note: Please confirm the fan voltage and the actually connected fan power supply before connecting.
Note that if you want to use the RTC function, please first disable the DSI and CSI. And I2C-10 is used by default.
RTC (PCF85063a) on i2c-10, address is 0x51 (7-bit address)
FAN (EMC2301) on i2c-10, address is 0x2f (7-bit address)
If you need simple use or need to add to your program instead of the kernel, see C and Python demos. CM4 RTC FAN
RTC
Open the terminal and modify the config.txt file.
sudo nano /boot/config.txt
Add the following lines to the file and modify the audio setting:
#Add the lines to the end of file dtparam=i2c_vc=on dtoverlay=i2c-rtc,pcf85063a,i2c_csi_dsi #remove the setting dtparam=audio=on by adding the # to the front of the line #dtparam=audio=on
Save and reboot the Raspberry Pi.
sudo reboot
Hwclock
Synchronize system clock -> hardware clock.
sudo hwclock -w
Synchronize hardware clock -> system clock.
sudo hwclock -s
Note that you need to disable the network synchronization function, otherwise, the time will be changed according to network time.
Set hardware clock:
sudo hwclock --set --date="9/8/2021 16:45:05"
Check the hardware clock.
sudo hwclock -r
Check the version.
sudo hwclock --verbose
Cooling 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 currently no official configuration method for fans, there is a third-party configuration method: https://github.com/neg2led/cm4io-fan
This method is released by a third party, not an official release, and we are not responsible for any problems!
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
The device tree overlay has a few options, here's the equivalent of a /boot/overlays/README info section:
############################# 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) #############################
For example, speed up the fan if the temperature is higher than 45°C and set it to maximum value if the temperate is higher than 50°C:
dtoverlay=cm4io-fan,minrpm=500,maxrpm=5000,midtemp=45000,midtemp_hyst=2000,maxtemp=50000,maxtemp_hyst=2000
CSI DSI
Configuration file
CSI and DSI interfaces are closed by default, they will use the I2C-10, I2C-11, and I2C-0.
Open a terminal and run the following commands:
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/ #If using two cameras and DSI0 execute sudo dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp0-double_cam.dts # if using two cameras and DSI1 execute sudo dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp1-double_cam.dts #When using any DSI, HDMI1 has no image output, even if you do not connect the DSI screen, as long as the corresponding file is compiled, then HDMI1 will not 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 the CM4
Recording test
Then connect the Camera and DSI display:
1: Make sure the connection is in the power-off state
2: Connect Power
3: Wait a few seconds for the screen to start up
4: If it fails to start, check whether /boot/dt-blob.bin exists, and restart it if it exists.
5: The camera needs to run raspi-config, select Interfacing Options->Camera->Yes->Finish-Yes, reboot the system, open the enabled camera, and then restart to save the changes.
Old version (Buster)
Test the Raspberry Pi camera.
Check the first camera connected to the screen:
sudo raspivid -t 0 -cs 0
Check the second camera connected to the screen:
sudo raspivid -t 0 -cs 1
New version(Bullseye)
If using the latest Raspberry Pi OS (Bullseye):
libcamera-hello -t 0 or libcamera-hello #The new system uses dual cameras #Remove camera_auto_detect=1 in config.txt #camera_auto_detect=1 #Add to dtoverlay=imx219,cam1 dtoverlay=imx219,cam0 #where imx219 is the camera sensor model, and there are other sensors dtoverlay=ov5647,cam0 dtoverlay=imx219,cam0 dtoverlay=ov9281,cam0 dtoverlay=imx477,cam0 #then restart reboot #Other part of the command: #Check if the camera is detected libcamera-hello --list-cameras #Open the corresponding camera libcamera-hello --camera 1 libcamera-hello --camera 0 #Taking Pictures libcamera-jpeg -o test.jpg #You can add --camera to specify the camera
More instructions click me
- Note: If using the DSI interface display will have an HDMI disabled, even if just compile the corresponding file without connecting the DSI screen.
- Any connection of two HDMIs can output images, not limited to that HDMI, if two HDMI screens are connected, only HDMI0 has image output
- If you want to enable both HDMI, delete the dt-blob.bin file with the following command:
sudo rm -rf /boot/dt-blob.bin
- Then reboot
Reference Raspberry Pi Manual
Document
- Schematic
- Raspberry Pi Compute Module 4 IO Board Brief
- Raspberry Pi Compute Module 4 IO Board Datasheet
- CSI Camera Reference
- DSI Display Reference
Demo codes
3D Drawing
Software