How to switch front/back camera on ODROID

ODROID-C2 lollipop support USB Webcam like front camera.

The camera preview is mirrored.

You can switch it back camera.

$ su
# mount -o rw,remount /system
# vi /system/build.prop

add this
rw.camera.usb.faceback=true

save and reboot system.
The camera preview is not mirrored.

How to install apps into SD card on ODROID-C2 marshmallow.

Install android 6.0.1 into 8GByte eMMC.

http://odroid.com/dokuwiki/doku.php?id=en:c2_release_android

5GByte userdata.

Install many apps.

storage space running out.

Insert SD Card.

Use as internal storage.

Enable sdcard like internal storage.

Settings -> Apps -> Storage

Move "Angry Birds" to "SanDisk SD card".

overclock CPU and DDR clock for ODROID-C2

1. CPU 1.5GHz, DDR Clock 912MHz

2. CPU 1.7GHz, DDR Clock 912MHz

http://odroid.com/dokuwiki/doku.php?id=en:c2_set_cpu_freq

open boot.ini.

# setenv max_freq "2016"  # 2.016GHz
# setenv max_freq "1944"  # 1.944GHz
# setenv max_freq "1944"  # 1.944GHz
# setenv max_freq "1920"  # 1.920GHz
# setenv max_freq "1896"  # 1.896GHz
setenv max_freq "1752"  # 1.752GHz
# setenv max_freq "1680"  # 1.680GHz
# setenv max_freq "1656"  # 1.656GHz
#setenv max_freq "1536"  # 1.536GHz

3. CPU 1.7GHz, DDR Clock 1104MHz

http://odroid.com/dokuwiki/doku.php?id=en:c2_adjust_ddrclk

# su
# mount -o rw,remount /
# wget http://dn.odroid.com/S905/BootLoader/ODROID-C2/c2_update_ddrclk_android.sh
# chmod 755 ./c2_update_ddrclk_android.sh
# ./c2_update_ddrclk_android.sh 1104
# reboot

How to enable YouTube quality 720P on ODROID.

If you use ODROID-C1+ version 4.4.x, You can't watch higher than 360P quality in YouTube.

Open Terminal app and edit build.prop

$ su
# mount -o rw,remount /
# vi /build.prop

ro.build.version.release=4.4.2 -> ro.build.version.release=5

Save and reboot.

Now enable 720p quality.

How to access internet by Bluetooth tethering on ODROID without Wi-Fi network.

1. Turn on Bluetooth tethering on Your smartphone

2. edit /init.odroid2.rc

$ su

# mount -o rw,remount /

# vi /init.odroid2.rc

Add service dhcpcd_bt-pan

diff --git a/init.odroidc2.rc b/init.odroidc2.rc

index 92362aa..5adf868 100644

--- a/init.odroidc2.rc

+++ b/init.odroidc2.rc

@@ -417,6 +417,11 @@ service dhcpcd_p2p /system/bin/dhcpcd -aABKL

     disabled

     oneshot

+service dhcpcd_bt-pan /system/bin/dhcpcd -ABKL

+    class main

+    disabled

+    oneshot

+

 service iprenew_wlan0 /system/bin/dhcpcd -n

     class main

     disabled

#reboot

3. Turn on Bluetooth on ODROID-C2.

4. Check 'Internet access'

5. Now enable to access internet without Wi-Fi network.

How to use ODROID like B/T speaker.

ODROID + HDMI monitor <-- B/T --> Smartphone

ODROID(car PC) <-- B/T --> Smartphone

Open Terminal Emulator.

$ su

# mount -o rw,remount /

# vi /build.prop

Add and save.

#Bluetooth Audio A2dp Sink    

persist.service.bt.a2dp.sink=true

Reboot system.

Now enable 'Media audio' item.

Connect your smartphone to ODROID via B/T and play music.

Android Nougat에서 강제로 화면 분할 사용하기

Android 7.0 Nougat부터 화면 분활이 가능합니다.

이런것도 가능합니다.

하지만 특정 app들은 화면 분할로 동작하지 않습니다. 대표적인게 Daum 사전/카카오톡입니다.

하지만 아래와 같이 개발자 옵션에서 '활동의 크기가 조정 가능하도록 설정'을 켜고 재부팅하면...

아래와 같이 화면 분활이 가능해 집니다.