Default IR protocol is NEC type. IR Remote Controller IR code > 11.Nas_1

Default IR protocol is NEC type. IR Remote Controller IR code

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https://wiki.odroid.com/accessory/connectivity/ir_remote_controller 195

https://www.hardkernel.com/ko/shop/ir-remote-controller/ 170

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작성일 2020.05.09 20:00

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wiki.odroid.com

Manufacturer Code: 0x4DB2

Button	IR code	Scancode	Android
Power	0xDC	116	KEYCODE_POWER
Mute	0x88	113	KEYCODE_VOLUME_MUTE
Home	0x82	102	KEYCODE_HOME
OK	0xCE	97	KEYCODE_DPAD_CENTER
Up	0xCA	103	KEYCODE_DPAD_UP
Left	0x99	105	KEYCODE_DPAD_LEFT
Right	0xC1	106	KEYCODE_DPAD_RIGHT
Down	0xD2	108	KEYCODE_DPAD_DOWN
Menu	0xC5	139	KEYCODE_MENU
Back	0x9A	158	KEYCODE_BACK
Volume Down	0x81	109	KEYCODE_VOLUME_DOWN
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.

LINUX

Manufacturer Code ( Address Code | Inverted Address Code )
: 0x4DB2

Data Code (IR Code | Inverted IR Code)

Button	IR code on Android	IR code on LIRC	Data code based on NEC	event
Power	0xDC	0x3B	0x3BC4	KEY_POWER
Mute	0x88	0x11	0x11EE	KEY_MUTE
Home	0x82	0x41	0x41BE	KEY_HOME
OK	0xCE	0x73	0x738C	KEY_ENTER
Up	0xCA	0x53	0x53AC	KEY_UP
Left	0x99	0x99	0x9966	KEY_LEFT
Right	0xC1	0x83	0x837C	KEY_RIGHT
Down	0xD2	0x4B	0x4BB4	KEY_DOWN
Menu	0xC5	0xA3	0xA35C	KEY_MENU
Back	0x9A	0x59	0x59A6	KEY_BACK
Volume Down	0x81	0x81	0x817E	KEY_VOLUMEDOWN
Volume Up	0x80	0x01	0x01FE	KEY_VOLUMEUP

Data format of Hardkernel stock remote controller is based on NEC protocol.
And NEC transmission code is configured as following.

Address code 8bit : 0x4D (0100 1101b), Actual address code is 0xB1 and 0x4D is the LSB/MSB swapped code of 0xB2 for LIRC format.
Inverted Address code 8bit : 0xB2 (1011 0010b), 0/1 inverted code of 0x4D
Data code 8bit
Inverted Data code 8bit

You can confirm the full data format using irw command.

root@odroid:~# irw
000000004db23bc4 01 KEY_POWER odroid
000000004db211ee 01 KEY_MUTE odroid
000000004db241be 00 KEY_HOME odroid
000000004db2738c 00 KEY_ENTER odroid

Please note that IR code format that is configured LIRC is different (lsb/msb position swapped) from its format on Android remote.

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