Differences

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

--- en:c2_hardwarehacking [2016/07/04 12:19]
odroid [Power On/Off switch]
+++ en:c2_hardwarehacking [2017/02/03 14:40] (current)
odroid [USB Hub IC issue]
@@ Line 17: / Line 17: @@
 {{:en:c1:c2_j8_power_cable_connection.png}}
+====== Alternative heartbeat LED ======
+If you want to remap the blue heartbeat LED to other GPIO, refer this great instruction.
+[[http://forum.odroid.com/viewtopic.php?f=135&t=22525#p151227|paulcrawford's guide on the forum]]
 ====== IR Remote Controller (Android) ======
 ----
@@ Line 35: / Line 41: @@
 |Volume Up|0x80|104|KEYCODE_VOLUME_UP|
-The IR remote key map is defined in /system/etc/remote.conf file.
+The IR remote key map is defined in /system/etc/remote.conf file.\\
+Default IR protocol is NEC type.
+====== USB Hub IC reset script ======
+If you need to do power-cycle to the USB devices on the USB host ports, run below commands.\\
+It will reset all the USB devices connected to the USB host ports.
+<code>
+echo 126 > /sys/class/gpio/export
+echo out > /sys/class/gpio/gpio126/direction
+sleep 1
+echo 0 > /sys/class/gpio/gpio126/value
+sleep 1
+echo 1 > /sys/class/gpio/gpio126/value
+echo 126 > /sys/class/gpio/unexport
+sleep 1
+</code>
+====== USB Hub IC issue ======
+Every power cycle, the USB hub controller is disconnecting the USB devices at among 5~7 second after starting the boot process. \\
+If you use a fast booting OS like Buildroot, Yocto and Ubuntu-Minimal, your USB devices will not work correctly. \\
+To avoid this issue, you need to run your USB application software slightly later after complete the booting process. \\
+Here is an example of the serious problem. Unfortunately, we couldn't find any workaround yet.\\
+[[http://forum.odroid.com/viewtopic.php?f=141&t=23733|Forum Thread]]