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computers / comp.sys.raspberry-pi / Re: Struggling to read signals from IR diode

Struggling to read signals from IR diode

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From: real-not...@apple-juice.co.uk (D.M. Procida)
Newsgroups: comp.sys.raspberry-pi
Subject: Struggling to read signals from IR diode
Date: Sat, 8 May 2021 12:38:03 +0100
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by: D.M. Procida - Sat, 8 May 2021 11:38 UTC

I'm using Pi3, Rasberry Pi OS Buster.

Diode: TSOP38238

The diode is connected to GND, 3.3V and GPIO14 (= header pin 8)

In /boot/config.txt:

dtoverlay=gpio-ir,gpio_pin=14

The IR configuration seems to be OK and assigned to /sys/class/rc/rc0.

$ ir-keytable
Found /sys/class/rc/rc0/ (/dev/input/event0) with:
Name: gpio_ir_recv
Driver: gpio_ir_recv, table: rc-rc6-mce
LIRC device: /dev/lirc0
Attached BPF protocols: Operation not permitted
Supported kernel protocols: lirc rc-5 rc-5-sz jvc sony nec sanyo
mce_kbd rc-6 sharp xmp imon
Enabled kernel protocols: lirc rc-6
bus: 25, vendor/product: 0001:0001, version: 0x0100
Repeat delay = 500 ms, repeat period = 125 ms

But I get no results from:

$ ir-keytable -t -s rc0
Testing events. Please, press CTRL-C to abort.

I've also tested with multiple remote controls, other diodes, different
sets of wires, different GPIO pins...

Not really sure how to go about debugging further.

Daniele

Re: Struggling to read signals from IR diode

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From: real-not...@apple-juice.co.uk (D.M. Procida)
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Struggling to read signals from IR diode
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by: D.M. Procida - Sat, 8 May 2021 12:23 UTC

D.M. Procida <real-not-anti-spam-address@apple-juice.co.uk> wrote:

> I'm using Pi3, Rasberry Pi OS Buster.
>
> Diode: TSOP38238
>
> The diode is connected to GND, 3.3V and GPIO14 (= header pin 8)
>
> In /boot/config.txt:
>
> dtoverlay=gpio-ir,gpio_pin=14
>
> The IR configuration seems to be OK and assigned to /sys/class/rc/rc0.
>
> $ ir-keytable
> Found /sys/class/rc/rc0/ (/dev/input/event0) with:
> Name: gpio_ir_recv
> Driver: gpio_ir_recv, table: rc-rc6-mce
> LIRC device: /dev/lirc0
> Attached BPF protocols: Operation not permitted
> Supported kernel protocols: lirc rc-5 rc-5-sz jvc sony nec sanyo
> mce_kbd rc-6 sharp xmp imon
> Enabled kernel protocols: lirc rc-6
> bus: 25, vendor/product: 0001:0001, version: 0x0100
> Repeat delay = 500 ms, repeat period = 125 ms
>
>
> But I get no results from:
>
> $ ir-keytable -t -s rc0
> Testing events. Please, press CTRL-C to abort.

It turns out that ir-keytable -t without specifying the -s (sysdev)
flag did the trick. I don't understand *why* though!

Daniele

Subject	Author
Struggling to read signals from IR diode	D.M. Procida
Re: Struggling to read signals from IR diode	D.M. Procida