How To Set a custom IR CODE To Boot The System

Get the IR CODE

  • Enable IR Driver Debug Information
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root@Khadas:/home/khadas# echo 1 > /sys/class/remote/amremote/debug_enable

Press the button on the remote controller and check the kerenl log to get the remote controller IR code.

Here is an example of the Khadas remote controller, press the OK button of the remote controller, you can check the kernel log:

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# dmesg | grep "meson-remote"
[  723.513680@1] meson-remote c8100580.rc: framecode=0xf807ff00
[  723.513820@1] meson-remote c8100580.rc: receive scancode=0x7
[  723.519407@1] meson-remote c8100580.rc: keypressed=0x0
[  723.524531@1] meson-remote c8100580.rc: report key!!
[  723.604587@1] meson-remote c8100580.rc: ir controller busy flag = 0
[  723.605357@1] meson-remote c8100580.rc: keyup!!

You can find framecode=0xf807ff00 is the key value we need.

Set Custom IR CODE

You can set the IR CODE in uboot command line, there are two custom buttons that can be used.

Write IR CODE

  • Custom customer1
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kvim#kbi ircode customer1 w 0xf807ff00
  • Custom customer2
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kvim#kbi ircode customer2 w 0xf807ff00

Read IR CODE

  • Read customer1
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kvim#kbi ircode customer1 r
ircode1: 0xf807ff00
  • Read customer2
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kvim#kbi ircode customer2 r
ircode2: 0xf807ff00

Verify

  • Power off the system

  • In u-boot

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kvim#kbi poweroff
do_kbi_poweroff
  • In Ubuntu
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khadas@Khadas:~$ sudo poweroff
[sudo] password for khadas:
[  127.078301@0] reboot: Power down
bl31 reboot reason: 0x108
bl31 reboot reason: 0x108
system cmd  0.
bl30 get wakeup sources!
process command 00000006
bl30 enter suspend!
cpu clk suspend rate 1416000000
suspend_counter: 1
Enter ddr suspend
dmc sec unlock
first time suspend
ddr suspend time: 3353us
store restore gp0 pll
process command 00000001
CEC cfg:0x002f
set vddee to 0x035cmv
08915d0000000000cec reset

  • Long press the power button to power off

  • Power on with remote control

If everything work well, you can use OK button to wakeup the board.