Template: CM4-IO-WIRELESS-BASE Guide

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Writing Image

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
Compute Module 4 PoE 4G Board 1.png

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
Compute Module 4 PoE 4G Board 2.png

Install can-utils:

sudo apt-get install can-utils

Test to receive the 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 connecting the following modules:

CM4-IO-WIRELESS-BASE-B 09.png
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 USB 2.0 interfaces.
CM4-IO-WIRELESS-BASE-details-5.jpg
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.
It takes some time (about 30 seconds) to turn off or turn on the module if the antenna is not connected or the SIM card is not connected before turning on the module.
If the module can not be turned on, it may be GPIO6 pin is pulled high, please use the following command to pull the GPIO6 pin low to turn it on:

echo Exporting pin 6
echo 6 > /sys/class/gpio/export
echo Setting direction to out.
echo out > /sys/class/gpio/gpio6/direction
echo Setting pin 0

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

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 may be different if you connect another USB adapter).
sudo dhclient -v usb0
  • If the network cannot connect properly, please run one of the following AT commands 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 the network properly, please try to troubleshoot 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

LoRaWAN

Use sx1302-868m-lorawan-gateway-b.
Note: LoRaWAN gateway module has multiple frequency bands, pay attention to whether the region supports the corresponding frequency bands.

There are differences between the use procedure and the default procedure for the SX1302 868M LoRaWAN Gateway (B), the routines are as follows:

sudo wget https://files.waveshare.com/upload/9/9e/CM4-IO-WIRELESS-BASE-LoRaWAN.zip
unzip -o  CM4-IO-WIRELESS-BASE-LoRaWAN.zip -d ./CM4-IO-WIRELESS-BASE-LoRaWAN
cd CM4-IO-WIRELESS-BASE-LoRaWAN
make clean all
make all
cp tools/reset_lgw.sh util_chip_id/
cp tools/reset_lgw.sh packet_forwarder/

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.

CM4-DUAL-ETH-4G-5G-BASE-12.png

To enable the I2C for controlling the fan and the RTC, you need to add the line "dtparam=i2c_vc=on" on the 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://files.waveshare.com/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:

RTC PCF85063 c test.png

Python

Enter the python/example directory:

cd python/example

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:

RTC PCF85063 python test.png

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://files.waveshare.com/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: