Template:Compute Module 4 PoE 4G Board manual

Writing Image

• Write Image for Compute Module Boards eMMC version
• Wrote Image for Compute Module Boards Lite version

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

USB TO UART

The USB to UART port is connected to GPIO14(BCM) and GPIO15(BCM) pins of CM4 with a converter.
You can connect the USB to the UART port for login CM4 via serial.
The USB to UART port can also be used for power, in this case, you need to solder a 0ohm resistor to the pad for enabling the powering function.

Buzzer/LED

Buzzer

The buzzer is connected to GPIO22(BCM), low active.

LED

Two LEDs are integrated for users, the green one is connected to GPIO20(BCM)and the red one is connected to GPIO21(BCM), low active.

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 USB2.0 interfaces, it doesn't support PCIe devices.

SIM card is required to work with the 4G/5G module
This carrier board supports the 4G module by default, if you use it with 5G modules, some of the 5G functions are not supported.
If you use a 5G module, please check the [SIM8200EA-M2_5G HAT wiki] about how to set up 5G.

If you need to toggle the working status of the 4G module, you can control the GPIO6(BCM), set the GPIO6 to High for disabling the 4G module and set it to Low for enabling.
To toggle the working status of the 4G module, please add delay time for waiting for the operation to work.
If you use the 5G module, the GPIOs cannot work for it.

SIM7600 M.2 module

Status of M.2 indicators:

M.2_NET	M.2_STA
Red LED	Green LED	Status
Solid	OFF	Power OFF
Solid	OFF	Starting
Solid	Solid	SIM card is an invalid or weak signal
Solid	Blink	Working
OFF	Blink/Solid	Shutdowning

Before you configure the SIM7600 module, please make sure that the module is started normally.

sudo apt-get install minicom
sudo minicom -D /dev/ttyUSB2

Type the following command on the minicom

AT+CUSBPIDSWITCH=9011,1,1

Close the minicom and configure usb0

sudo dhclient -v usb0

About RNIDS networking, please refer to [Raspberry Pi networked via RNDIS RNIDS Networking method]
With the operations above, a USB0 port will be recognized.
If the network cannot work, please try to switch frequency with the following AT commands:

 AT+CNBP=0x0002000000400183,0x000001E000000000,0x0000000000000021
 AT+CNBP=0x0002000000400180,0x480000000000000000000000000000000000000000000042000001E200000095,0x0000000000000021

AT Commands

If the network cannot work, plaese check module with AT commands

sudo apt-get install minicom
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

PCIE

The PCIe interface is PCIe 2.0 X1, the maximum speed is 500Mb/s
Most of the PCIEx1 device is not supported by Raspberry Pi without a driver.
Please check your PCIe device before you used Supported device testing
Raspberry Kernel compiling

Isolation GPIO/I2C

Isolation output pins are GPIO17 （BCM） and GPIO27（BCM）
Isolation input pins GPIO23 （BCM） and GPIO24（BCM）

Configure the logic voltage of Isolation IO

Isolation I2C pins are GPIO2/3（BCM），I2C bus is I2C1，

【Expected result】

The two OUT pins troggle in order
Read the values of two IN pins

【python example】

cd IO/python
sudo python main.py

【C example】

cd IO/c
make clean
sudo make
sudo ./main

Isolation ADC

The isolation ADC is mounted in isolation I2C with 0x48 address
I2C is default disabled, please refer to #Enable I2C to enable the I2C interface.

C

 cd ADC/c/
 sudo ./main 

python

 cd ADC/python/
 sudo python examples/main.py

• Run the commands above to run the example

Expected result

Output voltage vlaue

Note: the ADC chip used is ADS1113, its reference voltage is 2.048V, the range of differential input.

CAN

The CAN is diabled by default, you need to modify the config.txt file for enabling it.

 #Open and edit config.txt
 sudo nano /boot/config.txt
 #Add the following line to the file and save
 dtparam=spi=on
 dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25
 #reboot Raspberry Pi
 reboot 

After rebooting, run the following command：

 dmesg | grep spi0

Run the following command：

sudo ip link set can0 up type can bitrate 1000000
sudo ifconfig can0 txqueuelen 65536
ifconfig

出现can0 设备号说明驱动成功

测试

安装can-utils:

sudo apt-get install can-utils

接收数据

candump can0

发送数据

cansend can0 000#11.22.33.44
#其中11.22.33.44 是数据
#如果需要发送其他数据可以使用继续添加例如
# cansend can0 000#11.22.33.04.70
#不可以使用英文和中文，两位一码格式添加

例程

【Python例程】

• 进入对应的目录：
• 接收端运行receive.py：

sudo python reveive.py

• 发送端运行send.py：

sudo python send.py

本例程是基于python平台，确保以及安装了python-can库
在发送之前要先创建一个can设备，因为前面只是启用MCP2515内核：

os.system('sudo ip link set can0 type can bitrate 100000')
os.system('sudo ifconfig can0 up')

• 第一步：连接到CAN总线
  

can0 = can.interface.Bus(channel = 'can0', bustyp = 'socketcan_ctypes')

• 第二步：创建信息
  

msg = can.Message(arbitration_id=0x123, data=[0, 1, 2, 3, 4, 5, 6, 7], extended_id=False)

• 第三步：发送信息

can0.send(msg)

• 最后同样要关闭can设备

os.system('sudo ifconfig can0 down')

• 接收数据：

msg = can0.recv(10.0)

recv()中定义超时接收时间。
更多请参考：https://python-can.readthedocs.io/en/stable/interfaces/socketcan.html

【C例程】

• 阻塞接收，树莓派打开终端，运行：

cd CAN/c/receive/
make clean
sudo make
sudo ./can_receive

• 发送，树莓派打开终端，运行：

cd CAN/c/receive/
make clean
sudo make
sudo ./can_send

RS485/232

默认关闭,如需打开需要在config.txt中添加内容：
sudo nano /boot/config.txt

dtoverlay=uart3
dtoverlay=uart5
reboot 
ls /dev/ttyAMA*

RS232占用GPIO5/GPIO4(BCM编码4/5)，设备号ttyAMA1
RS485占用GPIO13/GPIO12(BCM编码13/12)，设备号ttyAMA2

测试

sudo apt-get install minicom
# RS232
sudo minicom -D /dev/ttyAMA1
#RS485
sudo minicom -D /dev/ttyAMA2

RTC FAN

• 注意事项：请在接通拓展板电源前接上风扇再完成测试，请不要在拓展板已通电即风扇控制芯片已经通电之后再接上风扇，否则会烧掉芯片！
• 注意事项：连接前请确认风扇电压和实际上连接的风扇供电

使用树莓派系统（2021-05-07-raspios-buster-armhf-full ）
注意 使用RTC禁止使用DSI和CSI
如果需要同时使用，将I2C切换到I2C1设备上（右边）

切换之后所有程序或者驱动全部需要修改
例程默认使用I2C10（左边）

如果需要简单使用，或者需要添加到你程序中而不是内核中，参考C和Python例程参考 [点这里]<br\>

RTC

sudo nano /boot/config.txt
#在最后添加
dtparam=i2c_vc=on
dtoverlay=i2c-rtc,pcf85063a,i2c_csi_dsi
#在dtparam=audio=on前面添加# 号
#dtparam=audio=on
#保存退出，重启
sudo reboot

Hwclock简单使用

同步系统时钟 -> 硬件时钟

sudo hwclock -w

同步硬件时钟 -> 系统时钟

sudo hwclock  -s
#需要关闭网络，或者关闭网络对时，负责会被改回去

设置硬件时钟时间：

sudo hwclock --set --date="9/8/2021 16:45:05"

查看硬件时钟

sudo hwclock -r

显示版本信息

sudo hwclock --verbose

<br\> <br\>

风扇

在上电的时候 风扇会转1秒，然后停止2秒，再转，这是正常现象<br\> 风扇目前没有官方的配置方法，有一个第三方配置方法：https://github.com/neg2led/cm4io-fan<br\> 此方法为第三方发布，不是官方发布，出现任何问题，概不负责！<br\>

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
#下面是对于config.txt的描述介绍
#############################
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)
 #############################
或者 直接参考如下：
dtoverlay=cm4io-fan,minrpm=500,maxrpm=5000,midtemp=45000,midtemp_hyst=2000,maxtemp=50000,maxtemp_hyst=2000
温度高于45摄氏度开始加速,高于50摄氏度最高速

CSI DSI

CSI 和 DSI默认是关闭的，使用摄像头和DSI的时候会占用I2C-10、I2C-11、I2C-0 三个I2C设备
开机执行如下：

sudo apt-get install p7zip-full
wget https://www.waveshare.net/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/
#如果使用两个摄像头和DSI0 执行
sudo  dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp0-double_cam.dts
#如果使用两个摄像头和DSI1 执行
sudo  dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp1-double_cam.dts
#在使用任意DSI时，HDMI1没有图像输出，哪怕你没有连接DSI屏幕只要编译的对应的文件，那HDMI1就没有输出了
#如果需要恢复，删除对应的dt-blob.bin 即可： sudo rm -rf /boot/dt-blob.bin 
#执行完毕 关闭电源 重启CM4

再连接摄像头和DSI屏幕：
1: 确保断电状态下连接
2: 使用CM-DSI-ADAPTER 转接板连接Compute Module 4 PoE Board和DSI屏幕
3: 使用CSI转接线转接板连接Compute Module 4 PoE Board和CSI摄像头
3: 连接电源
4: 等待几秒后屏幕启动
5: 如果无法启动，检查/boot/dt-blob.bin 是否存在，如果存在再次重启即可
6: 摄像头需要运行raspi-config，选择Interfacing Options->Camera->Yes->Finish-Yes，reboot系统，打开enable camera，然后重启即可保存修改。

参考

测试树莓派摄像头 查看接入的第一个摄像头画面：

sudo raspivid -t 0 -cs 0

查看接入的第二个摄像头画面：

sudo raspivid -t 0 -cs 1

参考CSI相机 DSI显示器

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