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  • Struggling to read signals from IR diode

    From D.M. Procida@3:770/3 to All on Sat May 8 12:38:03 2021
    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
    --- SoupGate-Win32 v1.05
    * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)
  • From D.M. Procida@3:770/3 to D.M. Procida on Sat May 8 13:23:43 2021
    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

    --- SoupGate-Win32 v1.05
    * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)