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    [[rock3 | ROCK 3]] > [[rock3/dev | Development]] > [[rock3/dev/adb | Using adb ]]

===Description===

ROCK 3 supports adb function. Here we use test it on ROCK 3A.
Here we use Type-A to Type-A USB cable with one port connected to the Type-A socket of ROCK 3A, 
and the other port connected to the Type-A socket of the PC.

===Hardware support===

Support hardware platform:
* ROCK 3A  V1.1 or later

You'd better follow the installation steps.

=== Operations on ROCK 3A ===

Step 1: Set the USB OTG switch to the '''device''' side(silk screen)

Step 2: Use ssh or [[rock3/dev/serial-console  | serial console]] to access ROCK 3A.

Step 3: Update rockchip-overlay, kernel, rockchip-adbd kernel packages to the latest version.

  $ sudo apt-get install update
  $ sudo apt-get install -y rockchip-overlay 
  $ sudo apt-get install -y linux-4.19-rock-3-latest
  $ sudo apt-get install -y rockchip-adbd

Step 4: Reboot the device.

  $ sudo reboot

=== Operations on PC ===

==== Windows ====

Install adb tool under Wins PC. Refer [[Rock/windows_adb | Windows ADB]]

==== Linux ====

Install adb tool under Linux PC. Refer [[Rock/linux_adb | Linux ADB]]

=== ADB Usage ===

Here we use adb to access ROCK 3A under Linux PC.

====Check adb devices====

  $ adb devices
  List of devices attached 
  0123456789ABCDEF	device

====Login/Shell====

  $ adb shell
  # 

And type /bin/bash followed by Enter key to switch to bash shell.

  $ adb shell
  # /bin/bash
  root@rock3a:/# 
  root@rock3a:/# 

====Transmit files from PC to ROCK 3A====

  $ adb push <local path> <remote path>

Example:

On PC, input the following in Terminal

  $ adb push /tmp/meet-rock3a.md /home/rock
  /tmp/meet-rock3a.md: 1 file pushed. 0.0 MB/s (31 bytes in 0.002s)

Check on ROCK 3A

  root@rock3a:/# cat /home/rock/meet-rock3a.md 
  How do you do! ROCK 3 Model A!

====Transmit files from ROCK 3A to PC====

  $ adb pull <remote path> <local path>

Example:

  $ adb pull /home/rock/meet-pc.md /tmp
  /home/rock/meet-pc.md: 1 file pulled. 0.0 MB/s (19 bytes in 0.002s)

  $ cat /tmp/meet-pc.md 
  How do you do! PC!

=== FAQ ===

==== Usage of rockchip-adbd service ====

Start rockchip-adbd service

  $ sudo systemctl start rockchip-adbd

Stop rockchip-adbd service

  $ sudo systemctl stop rockchip-adbd

Reload rockchip-adbd service

  $ sudo systemctl reload rockchip-adbd
  or
  $ sudo systemctl restart rockchip-adbd

If you still have issue with adb, start a new post on the forum. https://forum.radxa.com/c/rock3