Remote login

Introduce how to access SBC through a personal computer (PC) via serial port,adb,etc.

ADB login

ADB is a bridge between your Android device and your computer, and is used to fully operate and manage your Android device on your computer.

preparation

install adb(Android Debug Bridge):

Windows

Download the Windows version of the adb toolkit from Android,and after downloading and decompressing,you need to configure the environment variables:

Method 1:Enter the following command in the terminal window:

set HTTP_PROXY=myserver:1981

Method 2:Open system settings and modify environment variables:

Linux

Use the following command to install:

sudo apt install adb

Mac

Download the Mac version of the adb toolkit from Android,and after downloading and decompressing,you need to configure the environment variables:

export PATH=${path}:~/platform-tools( '~' is the path of the extracted toolkit)

Wired login

Requirements

• 1 x USB A-A cable
• 1 x computer or laptop with the ADB tool installed on it
• 1 x ROCK 2A

Steps

1. Connect the USB cable between the USB connector of the computer and the OTG Type C connector of the ROCK 2A.
2. Open the computer terminal and enter adb devices to confirm that the ROCK 2A is recognized.Type adb shell to login.

$ adb devices
  List of devices attached
  f94f8e0d28380ceb device

$ adb shell
  RadxaRock2A:/ $

Wireless login

Wireless ADB is supported on Android 11 and later.

Requirements

1. a computer or laptop with ADB tools installed and ADB version greater than 31.0.0.
2. a ROCK 2A with an Android image greater than or equal to 11.
3. the computer and ROCK 2A need to be on the same LAN.

Steps

1. Start ROCK 2A and connect to the network using wifi.
2. Enter the Developing mode by tapping the version number 7 times (Settings -> About Tablet -> Version Number).
3. Go to Developing Options (Settings -> System -> Developing Options),turn on wireless debugging and memorize the IP address and interface (example: 10.0.0.16:45613).
4. Open a computer terminal and type adb connect 10.0.0.16:45613 to connect to the ROCK 2A,type adb shell to login.

$ adb connect 10.0.0.16:45613
$ adb shell
  RadxaRock2A:/ $

Serial login

Most of radxa's products define pins 8 (TX) and 10 (RX) on the GPIO pins as UART serial communication interfaces to make it easier to troubleshoot problems in the early startup phase of the system.

Preparation

• Radxa product with GPIO, compatible power supply
• PC
• USB to TTL Serial Cable

tip

For Radxa products based on Rockchip chips, the default UART configuration is 1500000n8 without flow control.

Please check if your USB to TTL serial cable supports 1.5M baud rate:

• Based on CP210X and PL2303x some products have baud rate limitations.
• Based on FT232RL, some products have power issues.

The Flowing text uses a serial cable based on CH340.

Serial Connection

As shown below, connect the USB to TTL serial cable:

Radxa SBC	Connection	Serial Cable
GND (pin 6)	<--->	Black line
TX (pin 8)	<--->	White line
RX (pin 10)	<--->	Green line

danger

Please do not connect the red power line!

Using Serial Tools

For Radxa products based on Rockchip chips, the default UART configuration is as follows:

baudrate: 1500000
data bit: 8
stop bit: 1
parity  : none
flow control: none

Windows

Windows

Putty is a serial tool that supports multiple baud rates on Windows. Here's how to use Putty to connect to the serial port.

1. Download Putty and install it.

2. Plug the USB to TTL serial cable into the PC, check the Device Manager to find the COM number. Here, assume it is COM3.

3. Open Putty and set it up as follows:

• Select Session in the left column, set the serial line to COM3, baud rate to 1500000, and connection type to Serial.
• Write radxa-rock5 in the Saved Sessions column and click Save.

4. Select Serial at the bottom of the left column and configure it as follows:

5. After setting up, click Open to open the serial port. Make sure the TTL end is correctly connected, then turn on the power to the board.

Linux

Linux

Minicom is a serial tool that supports multiple baud rates on Linux. Here's how to use Minicom to connect to the serial port.

1. Plug the USB end of the serial cable into the host PC, then find the serial device:

On the terminal, type dmesg | tail to get a printout similar to the following:

[10.654076] usb 1-6.4.3: new full-speed USB device number 103 using xhci_hcd
[10.755730] usb 1-6.4.3: New USB device found, idVendor=0403, idProduct=6001
[10.755732] usb 1-6.4.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[10.755733] usb 1-6.4.3: Product: USB <-> Serial
[10.755734] usb 1-6.4.3: Manufacturer: FTDI
[10.756728] ftdi_sio 1-6.4.3:1.0: FTDI USB Serial Device converter detected
[10.756750] usb 1-6.4.3: Detected FT232BM
[10.757195] usb 1-6.4.3: FTDI USB Serial Device converter now attached to ttyUSB0

As shown in the last line, /dev/ttyUSB0 is the newly inserted serial device.

tip

Maybe there is no permission to read and write the serial port.

Temporary solution: Change the permission with the chmod command

sudo chmod 777 /dev/ttyUSB0

Permanent solution: Add the current user to the dialout group

sudo usermod -aG dialout $USER

2. Install minicom:

sudo apt-get update
sudo apt-get install minicom

3. Set up minicom:

Please add the current non-root or non-sudo user to the plugdev group first.

sudo usermod -aG plugdev $USER

Edit ~/.bashrc and add the following parameters. After reopening a new terminal, it will take effect.

alias minicom='minicom -w -t xterm -l -R UTF-8'

Create and edit the file ~/.minirc.1500000-usb0, add the following content:

pu port             /dev/ttyUSB0
pu baudrate         1500000
pu bits             8
pu parity           N
pu stopbits         1
pu rtscts           No

4. Run the following command to connect to the device, specifying the parameter 1500000-usb0 to use the above configuration.

minicom 1500000-usb0

Mac

Mac

Picocom is a serial tool that supports multiple baud rates on Mac. Here's how to use Picocom to connect to the serial port.

1. Install picocom

% brew install --build-from-source radxa/picocom/picocom

2. Open picocom

% picocom -b 1500000 -d 8 /dev/tty.usbserial-2130

FAQs

1. When using the debug console, the system startup information is displayed on the screen, but I cannot enter text using the keyboard? It may be that Hardware Flow Control is enabled by default. After turning off Hardware Flow Control, it should return to normal.