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en:c2_hardwarehacking [2015/12/14 15:17] charles.park created |
en:c2_hardwarehacking [2017/02/03 14:40] (current) odroid [USB Hub IC issue] |
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| - | ====== MicroUSB Power ====== | ||
| - | ===== 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** can be provided a power through Micro USB instead of DC jack.\\ | ||
| - | J8에 점퍼를 연결한 경우 USB POWER를 사용할 수 있습니다. | ||
| - | |||
| - | {{: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 ====== | ====== Power On/Off switch ====== | ||
| - | You can control power supplying to **ODROID-C2+** and **ODROID-C2** while DC adaptor is connected with external switch, Sliding or Toggle Switch for example, if you connect such switch to **J4** on the board. **J4** is connected to **NCP372** (Protection IC). There is an ENABLE pin on the NCP372 and it is a low-active and have an internal pull-down resistor for default on. | + | You can control power supplying to **ODROID-C2** while DC adaptor is connected with external switch, Sliding or Toggle Switch for example, if you connect such switch to **J4** on the board. **J4** is connected to **NCP372** (Protection IC). There is an ENABLE pin on the NCP372 and it is a low-active and have an internal pull-down resistor for default on. |
| || Switch status | Output of NCP372 || | || Switch status | Output of NCP372 || | ||
| Line 26: | Line 10: | ||
| <WRAP left round alert 70%> | <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> | </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) ====== | ====== IR Remote Controller (Android) ====== | ||
| ---- | ---- | ||
| Line 46: | Line 41: | ||
| |Volume Up|0x80|104|KEYCODE_VOLUME_UP| | |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]] | ||
