CM4-IO-WIRELESS-BASE
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Overview
This is an industrial expansion module based on Raspberry Pi CM4, which features common interfaces such as Gigabit Ethernet, HDMI, USB, and GPIO, allowing additional 4G / 5G / LoRa wireless communication modules to be connected via the M.2 or Mini-PCIe socket. There are also industrial interfaces/resources including RS485, CAN, and RTC.
Combined with the industrial rail-mount protection case, the module is an ideal choice for building an IoT gateway, 4G/5G router, IoT data acquisition, or even the PLC device in the industrial automatic control system, and more.
Notices
1. DO NOT hot-plug any devices except the USB and HDMI.
2. Please check the FAN voltage before connecting the cooling fan. The BASE board supports a 12V cooling fan by default, if you want to use a 5V cooling fan, please change the FAN_VCC resistor.
3. DO NOT connect other devices while writing CM4 via Type C interface for stable working.
4. 5V/2.5A or higher power supply is recommended for proper working.
5. DO NOT power the Base board by 12V DC and the 5V Type C at the same time.
6. The USB2.0 is disabled by default, you need to add the line dtoverlay=dwc2,dr_mode=host to config.txt to enable it.
Specifications
| CM4 SOCKET | suitable for all variants of Compute Module 4 |
| NETWORKING | Dual Gigabit Ethernet RJ45 |
| M.2 B KEY / Mini-PCIe (via adapter), for connecting 5G / 4G / LoRa wireless module | |
| Nano-SIM card slot supports standard Nano-SIM card for 5G/4G/3G/2G communication | |
| USB | USB 2.0 × 3 |
| PIN HEADER | Non-isolated RS485 × 2, Non-isolated CAN × 1, Partial GPIO pins |
| CAMERA | MIPI CSI-2 × 1 (15pin 1.0mm FPC connector) |
| VIDEO | HDMI × 1, supports 4K 30fps output |
| RTC | Real-time clock with a battery socket and ability to wake Compute Module 4 |
| STORAGRE | MicroSD card socket for Compute Module 4 Lite (without eMMC) variants |
| FAN HEADER | 5V/12V, allows speed adjustment and measurement |
| POWER INPUT | 5V or 7~36V |
| DIMENSIONS | 145 × 90 × 40mm |
Dimensions
CM4-IO-WIRELESS-BASE
Compute_Module 4
Onboard Resource
| Label | Name | Description | |
| 1 | CM4 Connector | Applies to all versions of Compute Module 4 | |
| 2 | HDMI port | HDMI port, supports 4K 30fps output | |
| 3 | USB 2.0 interface | 3-channel 2.0 interface, support various USB device insertion | |
| 4 | RJ45 Gigabit Ethernet port | RJ45 Gigabit Ethernet port, support 10/100/1000M network access | |
| 5 | DC power supply port | 7 ~ 36V DC power supply port | |
| 6 | CM4 status indicator | Red light (PWR): Raspberry Pi power indicator Green light (ACT): Raspberry Pi working status indicator | |
| 7 | 4G/5G module status indicator | Red light (STA): module enable indicator Green light (NET): module running status indicator | |
| 8 | PWR & USB interface | 5V DC power supply interface or USB burning interface | |
| 9 | M.2 B KEY | Communication module that supports access to 4G/5G or other USB channels | |
| 10 | Nano-SIM Card Holder | Can be connected to a standard Nano-SIM card for 4G/3G/2G Internet access | |
| 11 | BOOT switch button | ON: Compute Module 4 boots to USB Type-C port OFF: Compute Module 4 boots to eMMC or Micro SD card | |
| 12 | DC power supply port | 7 ~ 36V DC power supply port | |
| 13 | Dual non-isolated RS485 interface | Dual RS485 interface, providing 600W lightning protection, surge protection and 15KV electrostatic protection (reserve 120R optional balance resistance jumper cap) | |
| 14 | Non-isolated CAN interface | Anti-static and transient spike voltage (reserve 120R optional balance resistance jumper cap) | |
| 15 | Micro SD Card Interface | Used to insert a Micro SD card with the system to start the Compute Module 4 Lite | |
| 16 | FAN Power Supply Options | You can choose 5V or 12V to drive the fan | |
| 17 | CAM Interface | MIPI CSI Camera Interface | |
| 18 | RTC Battery Connector | Can be connected to CR1220 button battery | |
| 19 | M.2 VCC power supply selection | Choose 3.3V or 4.2V power supply | |
| RTC Interrupt Pin Switch | PI-RUN: RTC Trigger Interrupt CM4 Restart GN-EN: RTC Trigger Interrupt CM4 Power Off D4: RTC Trigger Interrupt D4 Pin | ||
| 21 | IO-VREF selection | CM4 IO logic voltage switch 3.3V or 1.8V | |
| 22 | FAN Power Supply Options | You can choose 12V (default) or 5V to drive the fan | |
| 23 | 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: Boot mode switch, only For use without EMMC boot or SD boot | |
| 24 | RTC/FAN I2C bus selection | SDA0/SCL0: shared by I2C-10 and CSI/DSI GPIO3/2: shared by I2C-1 and 40PIN | |
| 25 | Part of the GPIO interface | Contains a set of I2C and 2 GPIOs and power |
Writing Image
- Write Image for Compute Module Boards eMMC version
- Write Image for Compute Module Boards Lite version
RS485
The RS485 interface is disabled by default, if you want to enable it, please modify the config.txt file.
sudo nano /boot/config.txt
Add the following lines and save.
dtoverlay=uart3 dtoverlay=uart5
reboot the CM4
sudo reboot
The device ports in Raspberry of RS485 interfaces are.
/dev/ttyAMA1 /dev/ttyAMA2
CAN
The CAN interface is disabled by default, if you want to use it, please modify the config.txt file.
sudo nano /boot/config.txt
Add the following lines.
dtparam=spi=on dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25
Reboot the CM4.
sudo reboot
Open a terminal and run the following command to check if the spi0 interface was initialized.
dmesg | grep spi0
Run the following commands to config the can port.
sudo ip link set can0 up type can bitrate 1000000 sudo ifconfig can0 txqueuelen 65536 ifconfig
Install can-utils:
sudo apt-get install can-utils
Test to receive can data:
candump can0
Test to send can data:
cansend can0 000#11.22.33.44
M.2 B Key
The M.2 B Key port features PCIe, USB2.0, GPIO, I2C, and the SPI interface.
It supports to connect the following modules:
A Mini-PCIe adapter is provided for connecting devices that use the Mini PCIe package interface. (Note that it is just the Mini PCIe interface but not pinout real PCIe pins, it doesn't support PCIe devices)
4G/5G
To work with 4G/5G, you need to connect a wireless module to the M.2 B KEY for featuring corresponding functions. M.2 B KEY only extends USB3.0 interfaces, it doesn't support PCIe devices.
SIM card is required to work with the 4G/5G module
If you want to disable the 4G/5G module, you can set the GPIO6 to High and enable it again by setting the GPIO6 to Low.
The module requires about 30s to enable/disable the 4G/5G modules.
Status
| STA | NET | STATUS |
|---|---|---|
| ON | OFF | Shutdown or Stating |
| ON | ON | Searching network |
| ON | Flash | Working |
| OFF | Flash/ON | Shutting down |
Before you configure the 4G/5G module, please make sure that the module is working normally.
Configure 5G Modules
- Please refer to SIM8200EA-M2_5G_HAT.
Configure 4G Modules
- Install minicom
sudo apt-get install minicom
- Run the minicom to configure moudules
sudo minicom -D /dev/ttyUSB2
- Configure the modules with the following command
AT+CUSBPIDSWITCH=9011,1,1
- Exit from the minicom and run the following command to assign IP for the usb0 (it maybe different if you connect other USB adapter)
sudo dhclient -v usb0
- If the network cannot connected properly, pleaes run theone of the following AT command to change the frequency and test it again.
AT+CNBP=0x0002000000400183,0x000001E000000000,0x0000000000000021 AT+CNBP=0x0002000000400180,0x480000000000000000000000000000000000000000000042000001E200000095,0x0000000000000021
AT commands
If your 4G modules cannot connect to network properly, please try to trobuleshoot by minicom and the AT commands.
sudo minicom -D /dev/ttyUSB2
- Common AT commands
| Command | Description | Return |
|---|---|---|
| AT | AT test | OK |
| ATE | ATE1 enable echo ATE0 disable echo |
OK |
| AT+CGMI | Check manfacture | OK |
| AT+CGMM | Check module type | OK |
| AT+CGSN | Check SN | OK |
| AT+CSUB | Check module version | OK |
| AT+CGMR | Check firmware version | OK |
| AT+IPREX | Configure hardwara baud rate | +IPREX: OK |
| AT+CRESET | Reset module | OK |
| AT+CSQ | Check signal quanlity | +CSQ: 17,99 OK |
| AT+CPIN? | Check SIM status | +CPIN: READY |
| AT+COPS? | CHeck the current supplier | +COPS: OK |
| AT+CREG? | Check network status | +CREG: OK |
| AT+CPSI? | Check UE information | |
| AT+CNMP | Configure network mode： 2：Automatic 13：GSM only 38：LTE only 48 ： Any modes but LTE ... .... |
OK |
For more AT commands, please refer to： AT_Command_V2.00
You can also refer to：SIMCom
RTC FAN
- Note 1: Please connect the cooling fan before you power the whole device, otherwise, the control chip will be damaged!
- Note 2: Please check the voltage before you connect the cooling fan, it is default 12V.
To use the RTC, you need to disable DSI or CSI interfaces.
Or modify the RTC/FAN resistors for changing the I2C to I2C1 (right side).
You need to modify codes if you change the i2c.
To enable the I2C for controlling the fan and the RTC, you need to add the line "dtparam=i2c_vc=on" on thw config.txt file
RTC is connected to i2c-10 with address 0 x 51（7bits）
FAN is connected to i2c-10 with address 0 x 2f（7bits）
sudo nano /boot/config.txt
Add the following lines to the end of the config.txt
dtparam=i2c_vc=on dtoverlay=i2c-rtc,pcf85063a,i2c_csi_dsi
And then comment out the line dtparam=audio=on
#dtparam=audio=on
Save the file and reboot the system
sudo reboot
RTC test
1. Download the test demo.
Open the terminal of the Raspberry Pi, and enter the following command:
sudo apt-get install p7zip-full sudo wget https://www.waveshare.com/w/upload/4/42/PCF85063_code.7z 7z x PCF85063_code.7z -O./ cd PCF85063_code
2. Run the demo
C
Execute the following commands to compile and execute the test demo:
cd c sudo make clean sudo make -j 8 sudo ./main
And then you can check the running result as below:
Python
Enter the python/example directory：
cd python/example
And then run the python demo, the demo can support python2/3
# python2 sudo python main.py # python3 sudo python3 main.py
The running result is as below:
Using Hwclock
- Synchronize the system clock and the RTC.
sudo hwclock -w
- Synchronize the hardware clock and the RTC.
sudo hwclock -s
Note that it will be restored if the network is disabled.
- 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
FAN test
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 following is a 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 temperature is higher than 45 degrees Celsius and starts to accelerate, and the highest speed is higher than 50 degrees Celsius.
CSI DSI
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 wget https://www.waveshare.com/w/upload/4/41/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 you want to use both cameras and DSI0 sudo dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp0-double_cam.dts #If you want to ue both cameras and DSI1 sudo dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp1-double_cam.dts
- And then connect the cameras and DSI display
1: Please power off the IO Board first before your connection.
2: Connect the power adapter after connecting the cameras and DSI display
3: Wait a few seconds before the screen boot up.
4: If the DSI LCD cannot display, please check if you have added /boot/dt-blob.bin. If there already has the dt-blob.bin, just try to reboot.
5: The camera needs to be enabled by raspi-config, enter sudo raspi-config on the terminal, choose Interfacing Options->Camera->Yes->Finish-Yes and reboot the system
- Test the Cameras:
Test camera0:
sudo raspivid -t 0 -cs 0
Test camera1:
sudo raspivid -t 0 -cs 1
For more information about the CSI camera and DSI display, please refer to:
Resource
Document
- Schematic
- Raspberry Pi Compute Module 4 IO Board Brief
- Raspberry Pi Compute Module 4 IO Board Datasheet
- CSI Camera Reference
- DSI Display Reference
3D Drawing
Demo codes
Software
FAQ
1. Please remove the line dtparam -audio - on from /boot/config.txt file.
2. Remove dt-blob.bin file from the boot directory if it exists.
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Support
If you require technical support, please go to the Support page and open a ticket.