Differences

This shows you the differences between two versions of the page.

--- en:vu8c_backlightcontrol [2017/01/12 14:09]
joy.cho [VU8C Backlight On/Off Control by Monitor Status]
+++ en:vu8c_backlightcontrol [2017/03/20 09:46]
codewalker [1. Download script]
@@ Line 2: / Line 2: @@
 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 10: / Line 9: @@
-===== Ubuntu =====
+===== [ Ubuntu ] =====
 On Ubuntu, monitor standby time can be set using **Power Management Preferences** menu. \\
@@ Line 146: / Line 145: @@
 odroid    1757  0.5  0.0   5564   904 ttyS0    S+   11:28   0:00 grep --color=auto vu8c
 </code>
-===== Android =====
+===== [ 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.
+==== 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>
+#!/bin/sh
+path="/sys/class/gpio"
+echo 234 > $path/export
+echo 214 > $path/export
+echo out > $path/gpio234/direction
+echo out > $path/gpio214/direction
+echo 0 > $path/gpio234/value
+echo 0 > $path/gpio214/value
+chown system:system $path/gpio234/value
+chown system:system $path/gpio214/value
+cur_stat="On"
+while [ 1 ]; do
+sleep 1
+screen_info=`dumpsys power | grep "Display Power"`
+if [[ $screen_info == *"OFF"* && $cur_stat == "On" ]]; then
+	echo "monitor goes to Off"
+	# backlight off first
+	echo 1 > $path/gpio214/value
+	echo 1 > $path/gpio234/value
+	cur_stat="Off"
+elif [[ $screen_info == *"ON"* && $cur_stat == "Off" ]]; then
+	echo "monitor turns back On"
+	echo 0 > $path/gpio234/value
+	# backlight on later
+	echo 0 > $path/gpio214/value
+	cur_stat="On"
+fi
+done
+</file>
+  * ODROID-C1/C1+
+<file sh vu8c_backlight_c1_android.sh>
+#!/bin/sh
+path="/sys/class/gpio"
+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_backlight /system/bin/vu8c_backlight_c1_android.sh
+    class main
+    user root
+    group root
+    oneshot
+</code>
+And then, reboot the system.
+<code>
+# reboot
+</code>