Differences

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

--- en:c2_hardwarehacking [2016/02/03 14:17]
joy.cho [MicroUSB Power]
+++ en:c2_hardwarehacking [2017/02/03 14:40] (current)
odroid [USB Hub IC issue]
@@ Line 1: / Line 1: @@
-===== ODROID-C2 =====
-**ODROID-C2** can be supplied its power through USB OTG port, which is a H/W hack for ODROID-C2. Since **ODROID-C2** can consume current more than 500mA by itself while playing a video file or with some peripherals - keyboard/mouse/WiFi dongle - are attached to USB port, we strongly recommend to use 5V USB charger with minimal 700mA+ can be supplied.
-Please note that still DC jack works with the same specification of ODROID-C2 apart from USB OTG for power supplying.
-===== ODROID-C2 =====
-**ODROID-C2** power can be provided through Micro USB instead of DC jack by connecting jumper J8.\\
- {{:en:c1:c-microusb_mount_r87.png?250| After mount r87}}
-<WRAP left round important 70%>
-Since MicroUSB connector have high contact resistance relatively than DC jack, there would be much more power loss.
-</WRAP>
-<WRAP left round important 70%>
-If there is a USB device attached on USB host connector and consumes power a lot, the board might not be booted because the CPU can not be provided enough current. In order to prevent boot failure in such case, especially a USB device consumes a current more than 1A, we strongly recommend to keep providing power through DC jack.
-</WRAP>
 ====== Power On/Off switch ======
@@ Line 24: / Line 10: @@
 <WRAP left round alert 70%>
-With this hacking, we strongly recommend to shutdown the O/S completely before turn-off. Otherwise the file system could be damaged very easily. In Linux, for example, please make sure to execute **shutdown -r now** or **poweroff**.
+With this hacking, we strongly recommend to shutdown the O/S completely before turn-off. Otherwise the file system could be corrupted very easily. In Linux, for example, please make sure to execute **shutdown -r now** or **poweroff**.\\
 </WRAP>
+====== Alternative power input ======
+The J8 pins are added for an alternative power input (for easier wiring/soldering to power supply cable on PCB rev0.2 20160226)
+{{: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 44: / Line 41: @@
 |Volume Up|0x80|104|KEYCODE_VOLUME_UP|
+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]]