Re: How to catch raw codes ?

[Benoît-Pierre D. <be...@de...>]

On 10/02/18 23:35, Benoît-Pierre DEMAINE wrote:
> Hello.
>
> I want to perform manual decoding of air cooler device. The remote control
> can send a huge variety of commands; and I am not going to record every
> single of them in my lirc conf.
>
> I would like LIRC to call my app (bash shell script, possible via irexec),
> and pass me as argument the binary value received after timings decoding.
> I want to leave LIRC convert the timings sequence into a serie of 0s and
> 1s. And then, I handle the myself.
>
> This is performed here using pigpio, without LIRC:
> http://blog.bschwind.com/2016/05/29/sending-infrared-commands-from-a-raspberry-pi-without-lirc/
>
> but I would like to try using LIRC. I have a working /dev/lirc0 (which
> produces mess when I press my remote).
>
> Thanks.
>

After 1h of work, I have produced what I need. This bashscript reads lirc0
and produces the binary stream I need for further work. This converts IR
frames into 0/1 frames.

It's probably not portable, and would probably NOT work for other people
as is; but it works for me.

#!/bin/bash

n=1
t=1
v=400
mode2 -d /dev/lirc0 | {
while true ; do
        read -t 1 line
        [ "$line" = "" ] && {
                # timeout
                [ $n -eq 0 ] && echo "" && n=1
                t=1
                continue
        }
        n=0
        typ="$(echo "$line" | awk '{print $1}')"
        val="$(echo "$line" | awk '{print $2}')"
        z=0
        [ $val -gt $(($v/2)) ] && [ $val -lt $(($v*2)) ] && r=s && z=1
        [ $val -gt $(($v*2)) ] && [ $val -lt $(($v*4)) ] && r=m && z=1
        [ $val -gt $(($v*8)) ] && [ $val -lt $(($v*12)) ] && r=l && z=1
        [ $val -gt $(($v*12)) ] && r=x && z=1
        [ $z -ne 1 ] && {
                echo "${val} ???" >&2
                continue
        }
#       echo "$typ $r"
        [ "$typ" = "space" ] && {
                case "$r" in
                        "s")
                                echo -n "0"
                                t=0
                                ;;
                        "m")
                                echo -n "1"
                                t=0
                                ;;
                        "l")
                                echo "LARGE"
                                ;;
                        "x")
                                true
                                #echo "X"
                                ;;
                        *)
                                echo "???"
                esac
                continue
        }
        # here, we have a pulse.
        case "$r" in
                "s")
                        true
                        ;;
                "l")
                        # begin of frame
                        true
                        #echo -n ":"
                        [ $t -eq 0 ] && echo ""
                        t=1
                        ;;
                *)
                        echo "???"
        esac
done
}

-- 
 >o_/ DEMAINE Benoît-Pierre (aka DoubleHP) http://benoit.demaine.info/
If computing were an exact science, IT engineers would'nt have work \_o<

"So all that's left, Is the proof that love's not only blind but deaf."
(FAKE TALES OF SAN FRANCISCO, Arctic Monkeys)