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Wake up using IR remote controller and HDMI CEC
The current ODROID-C2 U-Boot supports Wake-Up functionality after Power Off.
You can do Power-on ODROID-C2 using the power key of HK's Remote Controller and CEC source signal.
This functionality makes just 30mW power increase compared with the old U-Boot.
- Ubuntu : Available with 3.14.79-82 (Sep 19, 2016) or higher version
- Android : Available with Android v2.2 release (Sep 06, 2016) or higher version
And you can refer to the following wiki page to check U-Boot version on user space. Your U-Boot version should be same or higher than the above two release dates.
The ODROID user, Kwiboo implemented IR and CEC wake-up sequences for LibreELEC.
Thank you, Kwiboo!
How to Wake Up (1) using IR Remote Controller
The available IR remote key is power key of HK's IR remote controller.
Manufacturer Code : 0x4DB2 IR code of Power Button : 0xDC Key Code : 0x23dc4db2
After power off using shutdown -P or poweroff, pushing Power Button will make ODROID-C2 wake-up and go booting process.
# shutdown -P ... [ 47.067156] reboot: Power down INFO: PSCI Affinity Map: INFO: AffInst: Level 0, MPID 0x0, State ON INFO: AffInst: Level 0, MPID 0x1, State ON INFO: AffInst: Level 0, MPID 0x2, State ON INFO: AffInst: Level 0, MPID 0x3, State ON ERprocess cCEC cfg:0x2f set vddee to 0x0352mv ->> Enter Power Off ... ->> Press Power Button GXBB:BL1:08dafd:0a8993;FEAT:EDFC318C;POC:3;RCY:0;EMMC:0;READ:0;CHK:0; TE: 91385 no sdio debug board detected BL2 Built : 11:44:26, Nov 25 2015. Board ID = 8 set vcck to 1100 mv set vddee to 1050 mv CPU clk: 1536MHz DDR channel setting: DDR0 Rank0+1 same DDR0: 2048MB(auto) @ 912MHz(2T)-13 Run bl30... Wait bl30...Done Sending bl301.....OK. Run bl301... chipidLoad bl33 from eMMC, src: 0x00034200, des: 0x01000000, size: 0x0006a6f0 secure task start! high task start! low task start! NOTICE: BL3-1: v1.0(debug):4d2e34d NOTICE: BL3-1: Built : 17:08:35, Oct 29 2015 INFO: BL3-1: Initializing runtime services INFO: BL3-1: Preparing for EL3 exit to normal world INFO: BL3-1: Next image address = 0x1000000 INFO: BL3-1: Next image spsr = 0x3c9 U-Boot 2015.01-00180-g1471870-dirty (Nov 08 2016 - 17:05:58)
How to Wake Up (2) using HDMI CEC
If your monitor supports CEC functionalities, after power off, you can find HDMI-CEC ODROID-C2 component among the external inputs on your monitor as following.
To make the connection with ODROID-C2, select the HDMI-CEC ODROID-C2 source.
Then, it makes ODROID-C2 will process the normal booting sequence.
A Brief Sequence Diagram
The below diagram shows a wake-up sequence.
The relevant commits have been merged middle of August, 2016 and you can find the history on HK u-boot github.
But be warned, we've seperated bl301 firmware source code from u-boot repository because of the issue of build failure on other platforms except X86-64 and support issue of build root.
So, if you want to adjust the routine or change the key code by yourself, please refer to the following wiki page.
Power consumption in power-off state
ODROID-C2 consumes only 0.3Watt approximately in the power-off state even the IR receiver and CEC blocks are alive.