How to: setup wakeup with your IR remote control

bir8339e · Published in 2016-10-12 23:02:46

The only thing missing for me on OE on a NanoPI-M1 (identical to the OPi One) was being able to wake up the board with the IR remote (a brandless one I bought on Ebay). The procedure I used to set it up was as follows:

1. Setup lirc as indicated on the FAQ. Make sure you set up the POWER button on your remote to the KEY_SLEEP code.
2. At this point you should be able to put the board to sleep using the POWER button on the remote, but will need to press the K1 button on the board to wake it up.
3. Power off the board and put the SD card on your work computer. I'm using Kubuntu on it but anything Linux will do (not sure the FEX tools needed are available for Windows).
4. The SD card has two partitions on it; one 512 MB (system) and another larger one (OE data). Mount both on your system; on mine they show up under /media/<username>/<id>.
5. Open your lircd.conf file at /media/<username>/<id of larger partition>/.config. This is an excerpt of mime:

begin remote
name /storage/.config/lircd.conf
bits 16
flags SPACE_ENC|CONST_LENGTH
eps 30
aeps 100
header 9032 4520
one 546 1709
zero 546 583
ptrail 546
repeat 9032 2266
pre_data_bits 16
pre_data 0x205D
gap 141638
toggle_bit_mask 0x0
begin codes
KEY_SLEEP 0x38C7

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6. It was reported that the ARISC firmware only recognizes NEC encoding from the remote. Assuming that, you must generate the correct values, as expressed in NEC encoding, to put on the script.bin file so that the POWER key can be decoded by the ARISC processor built-in to the H3. A NEC-encoded button press has the following format:

a 9ms leading pulse burst (16 times the pulse burst length used for a logical data bit)

a 4.5ms space

the 8-bit address for the receiving device (A1)

the 8-bit logical inverse of the address (A2)

the 8-bit command (B1)

the 8-bit logical inverse of the command (B2)

a final 562.5µs pulse burst to signify the end of message transmission.

Logical '0' – a 562.5µs pulse burst followed by a 562.5µs space, with a total transmit time of 1.125ms

Logical '1' – a 562.5µs pulse burst followed by a 1.6875ms space, with a total transmit time of 2.25ms

The values A2 and B2 should be the logical inversion (0->1, 1->0) of A1 and B1, respectively, but most remotes use both A1 and A2 to differentiate model and make.
7. Looking at the values on lircd.conf you may notice that the 'header', 'one' and 'zero' keys have values that approximately match the NEC encoding; 'header' is the 9ms leading pulse + the 4.5ms space and 'one' and 'zero' also match the symbols for 0 and 1. If that's the case the remote is compatible enough to the NEC encoding to use.
8. Now convert your 'script.bin' file to textual representation with this:

bin2fex /media/<username>/<id of 512MB partition>/script.bin ~/script.fex

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9. Open the 'script.fex' file and look for a line with '[s_cir0]'. Below it you'll find several pairs 'ir_power_key_code<order> = X' and 'ir_addr_code<order> = Y', being 'order' consecutive numbers starting from 0 and X/Y being the codes as seen by the ARISC firmware. But those codes are bit-reversed in regards to the lirc definitions. So Y is the same as 'pre_data' but bit-reversed' like this:

pre_data = 0x205D = 0010 0000 0101 1101 => (bit-reversed) => 1011 1010 0000 0100 = 0xBA04 = Y

Given that the key code is sent as a code and its logical inversion you'll notice that the code for the POWER key is composed of one byte (0x38) and its inverse (0xC7). So X should be the bit-reversal of the top 8 bits of the word like this:

KEY_SLEEP = 0x38C7 => code = 0x38 = 0011 1000 => (bit-reversed) => 0001 1100 = 0x1C = X

10. Add those codes to the [s_cir0] section, either by adding a new pair (make sure the order is consecutive and without duplicate numbers) or by just removing all existing pairs and adding this new one. I did it the second way and ended up with a section like this:

[s_cir0]
ir_used = 1
ir_rx = port:PL11<2><1><default><default>
ir_power_key_code0 = 0x1C
ir_addr_code0 = 0xBA04

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11. Now convert the FEX file back using this:

fex2bin ~/script.fex /media/<username>/<id of 512MB partition>/script.bin

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12. Un-mount the partitions, put the SD card back on the board and enjoy.

NOTE: If your lircd.conf file has the same values as mine on the 'bits' and 'pre_data_bits' you can follow the procedure above. If not you'll have to adapt it knowing that lirc records the bitstream frame from the remote like this:

<header> <plead> <pre_data> <pre> <data> <post> <post_data> <ptrail> <foot> <gap>

The default value (if missing from lircd.conf) for these keys is 0 and while 'pre_data' and 'post_data' are actual values from the bitstream the rest of the keys are durations in uS. As long as the values for 'header', 'one' and 'zero' are similar to mine it should be just question of finding out how to map the actual frame from the remote as detailed on lircd.conf into a NEC encoding as explained above.

c0013r · Published in 2018-1-22 19:27:46

Levitsky86 replied at 2018-1-19 01:22
Can someone answer me, please???

You read forum?
LibreElec 03/2017 - power off
LibreElec 02/2017 - suspend
OpenElec 02/2017 - suspend
use KEY_POWER
PS: yes, have problem with wi-fi(MT7601) after wake up, use wired LAN port - work correct after wake up.

jernej · Published in 2017-1-10 05:14:37

Your conversion is ok, except one slight detail. pre_data_bits is 16, which meanst you have to take into account 16 bit value not 8 bit.
Try with this conversion:
0x00BF => 0xFD00

[s_cir0]
ir_used = 1
ir_power_key_code0 = 0x12
ir_addr_code0 = 0xFD00

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jernej · Published in 2016-10-20 13:26:56

andreq replied at 2016-10-19 23:29
I'd be interested in knowning those other ways as I just installed everything on the build-in emmc ...

First make flash folder writable:

mount -o remount,rw /flash

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and then copy script.bin with scp, for which you have to have ssh enabled. For example, on host PC for command line tool on Linux:

scp script.bin root@192.168.0.10:/flash

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For Windows, there is graphical tool WinSCP.

jernej · Published in 2016-10-15 18:23:24

bir8339e,

although I didn't try your HOWTO yet, I'm glad that you figure it out. I spent quiet some time on this issue without any success. I will link your post in FAQ.

c0013r · Published in 2016-10-15 21:24:08

bir8339e,
Yes, this work, thank you.

Dima · Published in 2016-10-15 23:47:00

Thank you for the awesome guide. I'll try to check if I can get this working on Windows 10 with bash.

jernej · Published in 2016-10-16 20:57:42

I also confirm that it is working. Small addition: it is not required to set power button to "KEY_SLEEP", for me it also works set to "KEY_POWER". fex2bin and bin2fex are now also inside OE, but there is no image yet released with those tools. It will be in next release.

giaur500 · Published in 2016-10-19 01:50:33

Great news.

andreq · Published in 2016-10-19 08:35:06

What a good timing! I was digging online for any answer and didn't realize everything was lay right here on the forum

.

Thanks, it worked after a couple of try as my pre_data was 0xFF but actualy it's 0xFF00 which ended up being 65280 (decimal). I'm using a cheap A20 android box remote control, so I was able to fetch the script.bin in there and find out the needed power key and addr_code!

giaur500 · Published in 2016-10-20 00:14:56

Edited by giaur500 at 2016-10-20 00:22

Not working for me. My pre_data from lircd.conf = 0x202, so:

pre_data 0x202 = 000 0010 0000 0010 => bit_reversed 0100 0000 0100 0000 => 0x4040

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KEY_POWER is 0xB24D, so:

KEY_POWER 0xB24D => code 0xB2 => 1011 0010 => bit_reversed 0100 1101 => 0x4D

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fex:

[s_cir0]
ir_used = 1
ir_rx = port:PL11<2><1><default><default>
ir_power_key_code0 = 0x4D
ir_addr_code0 = 0x4040

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I converted it back to script.bin, replaced original file and nope, my device won't wake up on power key press. Also tried to change KEY_POWER to KEY_SLEEP, still not working. I have OrangePI PC. Any ideas? Should it be working on OrangePI PC?

jernej · Published in 2016-10-20 00:24:03

giaur500 replied at 2016-10-19 17:14
Not working for me. My pre_data from lircd.conf = 0x202, so:

Your math seems ok. Just one stupid question, did you reboot it first? Those settings are transfered to ARISC only at boot. Otherwise please post full lircd.conf.

giaur500 · Published in 2016-10-20 00:31:31

Edited by giaur500 at 2016-10-20 00:37

What do you mean by reboot? It was booted after sd card inserted after replacing script.bin on PC. My lirc.conf:

# Please make this file available to others
# by sending it to <lirc@bartelmus.de>
#
# this config file was automatically generated
# using lirc-0.9.1-git(default) on Sun Jun 12 13:38:31 2016
#
# contributed by
#
# brand: /storage/.config/lircd.conf
# model no. of remote control:
# devices being controlled by this remote:
#
begin remote
name /storage/.config/lircd.conf
bits 16
flags SPACE_ENC
eps 30
aeps 100
header 8979 4495
one 555 1696
zero 555 571
ptrail 555
repeat 8980 2260
pre_data_bits 16
pre_data 0x202
gap 79385
repeat_gap 129096
toggle_bit_mask 0x0
begin codes
KEY_SLEEP 0xB24D
KEY_VOLUMEUP 0xA857
KEY_VOLUMEDOWN 0x38C7
KEY_MUTE 0xC23D
KEY_E 0xCA35
KEY_O 0x58A7
KEY_LEFT 0x08F7
KEY_UP 0xD02F
KEY_RIGHT 0x8877
KEY_DOWN 0x708F
KEY_ENTER 0xB04F
KEY_ESC 0x42BD
KEY_I 0xA25D
KEY_PREVIOUS 0x9A65
KEY_SPACE 0x1AE5
KEY_NEXT 0xB847
KEY_STOP 0x22DD
KEY_0 0x00FF
KEY_1 0x807F
KEY_BACKSPACE 0xC837
KEY_2 0x40BF
KEY_3 0xC03F
KEY_4 0x20DF
KEY_5 0xA05F
KEY_6 0x609F
KEY_7 0xE01F
KEY_8 0x10EF
KEY_9 0x906F
end codes
end remote

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Also, to be sure I tried to decode back my new script.bin and I can see my new values are there (but provided in dec, not hex).