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--- en:vu8c_backlightcontrol [2017/01/13 12:07]
joy.cho [2. Configure Init to run script on boot]
+++ en:vu8c_backlightcontrol [2017/03/20 09:45]
codewalker [1. Download script]
@@ Line 1: / Line 1: @@
 ====== VU8C Backlight On/Off Control by Monitor Status ======
 This wiki page describes the way how to control vu8c backlight on/off when monitor status is triggered by controlling the related GPIO ports.\\
-So far, Ubuntu is available with the following scheme and we're investigating it on Android platform now.
@@ Line 147: / Line 147: @@
 ===== [ Android ] =====
-On Android, we are investigating how to control and run auto control scheme. \\
-As soon as it's done, we will make the instruction guide here.
-(UNDER CONSTRUCTION!!!)
 ==== 1. Download script ====
+First, set the root filesystem writable using remount command.
+<code>
+# su
+# mount -o rw,remount  /
+</code>
+Make or download the following shell script of the board model that you're using (C1 or C2)\\
+and copy it in **/system/bin/**.\\
+And make its permission executable
+<code>
+# su
+# chmod 755 /system/bin/vu8c_backlight_c2_android.sh
+</code>
+  * ODROID-C2
 <file sh vu8c_backlight_c2_android.sh>
-#!/system/bin/sh
+#!/bin/sh
 path="/sys/class/gpio"
@@ Line 167: / Line 178: @@
 echo 0 > $path/gpio214/value
-chown system system $path/gpio234/value
+chown system:system $path/gpio234/value
-chown system system $path/gpio214/value
+chown system:system $path/gpio214/value
 cur_stat="On"
@@ Line 193: / Line 204: @@
 done
 </file>
+  * ODROID-C1/C1+
+<file sh vu8c_backlight_c1_android.sh>
+#!/bin/sh
-==== 2. Configure Init to run script on boot ====
+path="/sys/class/gpio"
-Add the following in the end point of **/system/init.odroid.board.rc**
+echo 97 > $path/export
+echo 108 > $path/export
+echo out > $path/gpio97/direction
+echo out > $path/gpio108/direction
+echo 0 > $path/gpio97/value
+echo 0 > $path/gpio108/value
+chown system system $path/gpio97/value
+chown system system $path/gpio108/value
+cur_stat="On"
+while [ 1 ]; do
+sleep 1
+screen_info=`dumpsys power | grep "mScreenOn"`
+if [[ $screen_info == *"false"* && $cur_stat == "On" ]]; then
+	echo "monitor goes to Off"
+	echo 1 > $path/gpio97/value
+	echo 1 > $path/gpio108/value
+	cur_stat="Off"
+elif [[ $screen_info == *"true"* && $cur_stat == "Off" ]]; then
+	echo "monitor turns back On"
+	echo 0 > $path/gpio108/value
+	echo 0 > $path/gpio97/value
+	cur_stat="On"
+fi
+done
+</file>
+==== 2. Configure system init to run script on boot ====
+Now, you need to register the service to run this script automatically on boot time.\\
+Add the following lines in the end of **/system/init.odroid.board.rc**.\\
+Don't forget the root filesystem should be writable as aforementioned.
+- in case of C2
 <code>
+# su
 # vi /system/init.odroid.board.rc
+.....
+.....
+service vu8c_backlight /system/bin/vu8c_backlight_c2_android.sh
+    class main
+    user root
+    group root
+    oneshot
+</code>
+- in case of C1
+<code>
+# su
+# vi /system/init.odroid.board.rc
 .....
 .....
-service vu8c /system/bin/vu8c.sh
+service vu8c_backlight /system/bin/vu8c_backlight_c1_android.sh
     class main
     user root
     group root
     oneshot
+</code>
+And then, reboot the system.
+<code>
+# reboot
 </code>