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1. Firefly version

  • View the firmware version

    • In the Settings

      Settings–>About tablet–>Firefly version

      for example:

      ROC-RK3399-PC+ HDMI+DP(Android)
      rk3399_roc_pc_plus/industry-71/V1.2.2008101849/98c828d3a1d2

2. Open developer options

  • Settings–>About tablet–>Build number
  • Click Build number at least 7 times

3. Use of ADB

3.1. Connect the device​

3.1.1. USB way​

The host connects to the device via USB. For details on how to connect, please refer to the WiKi Tutorial of the device.

  • USB Type A interface

    • Enable USB connection

      • Android7.1

      Settings–>USB–>Connect to PC

      • Android10/Android11

      Settings–>Connected devices–>Connect to PC

  • USB Type C interface (enabled by default)

3.1.2. Network way​

The host connects to the device through the network (the host and the device are in the same LAN)

  • Open network ADB

  • View the IP address of the device

    Settings–>About tablet–>Status->IP address

  • Connect to device via IP address

    adb connect device_ip_address

3.2. Common commands​

  • Query device

    adb devices

  • Stop adb server

    adb kill-server

  • Install the app

    adb install path_to_apk

  • Copy files to device

    adb push local remote

  • Copy files from device

    adb pull remote local

  • Issue shell commands

    adb [-d |-e | -s serial_number] shell shell_command

4. Log

4.1. Last Log​

In the /sys/fs/pstore directory of the device:

  • console-ramoops-0: last_log The kernel log started last time, but only the logs with higher priority than the default log level are saved
  • pmsg-ramoops-0: Last user space log, android log

4.2. Log is automatically saved​

  • Open “Developer Options”

  • Enable automatic log saving

    • Android7.1

    Settings–>Developer options–>Android bug collector

    • Android10/Android11/Android12

    Settings–>System–>Developer options–>Android LogSave

  • reboot device

  • There are log related files in the /data/logs directory of the device (**Android 10 and above: **/data/vendor/logs)

    • android: system logcat
    • kernel: kernel kmsg

4.2.2. Way two​

  • Open “Developer Options”

  • Enable Enable logging to save

    Settings–>Developer options–>Enable logging to save

  • reboot device

  • There are log related files in the /data/media/0/.LOGSAVE directory of the device

    • xxxx_kmsg.log: kernel kmsg
    • xxxx_logcat.log: system logcat

NOTE: Only supports Android 7.1

4.2.3. Way three​

  • Open “Developer Options”

  • Enable Android bug collector

    Settings–>Developer options–>Android bug collector

  • reboot device

  • There are log related files in the /data/media/0/rk_logs directory of the device

    • COPY-COMPLETEB means log has been copied
    • anr means ANR file
    • bugreport.log means the bugreport file
    • logs means logcat, kmsg after each boot
    • pstore means last_log
    • tombstones means tombstones file

NOTE: Only supports Android 7.1

5. Android system signature file

5.1. Cloud storage​

6. Timer switch

  • The device must have an RTC chip

    • RK808
    • HYM8563

  • Equipment is always powered

You can directly use cat and echo to operate the interface under /sys/class/rtc/rtc0.

6.1. Set boot time​

For example, set it to boot after 120 seconds

# Turn on regularly after 120 seconds 
echo +120 >  /sys/class/rtc/rtc0/wakealarm
# View boot time 
cat /sys/class/rtc/rtc0/wakealarm
# Shut down 
reboot -p

7. Use of NPU

CPUBoard
RK3399AIO-3399C(AI)
RK3399ProAIO-3399Pro-JD4
RK3566ROC-RK3566-PC
RK3568AIO-3568J, ROC-RK3568-PC
RK3588ITX-3588J, ROC-RK3588S-PC

8. Turn on the touch effect

  • Open “Developer Options”

  • Enable Show taps

    • Android7.1
      Settings–>Developer options–>Show taps
    • Android10/Android11/Android
      Settings–>System–>Developer options–>Show taps

  • Enable Pointer location

    • Android7.1
      Settings–>Developer options–>Pointer location
    • Android10/Android11/Android12
      Settings–>System–>Developer options–>Pointer location

9. Rockchip Encoder/Decoder

9.1. MediaCodec​

Android’s MediaCodec calls the Rockchip Encoder/Decoder by default.

If you need native api, you can use MPP.

9.2. MPP​

Media Process Platform (MPP) provided by Rockchip is a general media processing software platform for Rockchip chip series. For applications the MPP platform shields the complex lower-level processing related to chips. Its purpose is to shield the differences between different chips and provide a unified media process interface (MPI) to users.