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

Open developer options

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

Use of ADB

Connect the device

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)

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

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

Log

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

Log is automatically saved

Way one (recommended use)

• 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

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

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

Android system signature file

Cloud storage

• download

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.

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

Use of NPU

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

Rockchip Encoder/Decoder

MediaCodec

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

If you need native api, you can use MPP.

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.

• Documents: SDK/RKDocs/common/MPP/
• Source Code: https://github.com/rockchip-linux/mpp