IMX8 gpio ir receiver using LIRC

bbq56go — Thu, 31 Oct 2019 03:32:08 GMT

I am working on Imx8mm evk and yocto project. (4.14.78_1.0.0_ga)
I have been trying ir-receiver solution.
The Remote Control is using the NEC IR Protocol.

1. GPIO setting

Edit fsl-imx8mm-evk.dts

{

ir_recv {

compatible = "gpio-ir-receiver";
gpios = <&gpio1 13 GPIO_ACTIVE_HIGH>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ir>;

};

:
:
:

};

&iomuxc {

pinctrl-names = "default";
pinctrl_ir: irgrp {

fsl,pins = <
MX8MM_IOMUXC_GPIO1_IO13_GPIO1_IO13 0x1d6
>;
};

:

:
:

};
Enable GPIO IR remote control

menuconfig ---> Device Drivers ---> Remote Controller devices ---> <*> GPIO IR remote control
GPIO1_13 status

root@imx8mmevk:~# cat /sys/kernel/debug/gpio
gpiochip0: GPIOs 0-31, parent: platform/30200000.gpio, 30200000.gpio:
gpio-13 ( |gpio-ir-recv ) in hi IRQ
gpio-15 ( |cd ) in lo IRQ

2. LIRC install

Edit the local.conf file

IMAGE_INSTALL_append = " lirc"
lircd version and check lirc driver

root@imx8mmevk:~# lircd -version
lircd 0.9.4d
root@imx8mmevk:~# dmesg | grep "LIRC" -i
[ 1.455517] lirc_dev: IR Remote Control driver registered, major 236
[ 1.500490] IR LIRC bridge handler initialized
[ 1.535966] rc rc0: lirc_dev: driver ir-lirc-codec (gpio-rc-recv) registered at minor = 0

3. TEST remote using mode2 command

Stop and check status lirc driver

root@imx8mmevk:~# systemctl stop lircd.socket lircd.service

root@imx8mmevk:~# systemctl status lircd.socket lircd.service
● lircd.socket
Loaded: loaded (/lib/systemd/system/lircd.socket; disabled; vendor preset: e>
Active: inactive (dead) since Thu 2019-09-26 07:17:02 UTC; 2min 19s ago
Listen: /run/lirc/lircd (Stream)

Sep 26 06:59:56 imx8mmevk systemd[1]: Listening on lircd.socket.
Sep 26 07:17:02 imx8mmevk systemd[1]: Closed lircd.socket.

● lircd.service - LIRC Infrared Signal Decoder
Loaded: loaded (/lib/systemd/system/lircd.service; enabled; vendor preset: e>
Active: inactive (dead) since Thu 2019-09-26 07:17:02 UTC; 2min 19s ago
Process: 3653 ExecStopPost=/bin/rm -fR /run/lirc (code=exited, status=0/SUCCE>
Process: 3652 ExecStopPost=/bin/rm -f /dev/lircd (code=exited, status=0/SUCCE>
Process: 3617 ExecStart=/usr/sbin/lircd --pidfile=/run/lirc/lircd.pid --devic>
Process: 3615 ExecStartPre=/bin/ln -s /run/lirc/lircd /dev/lircd (code=exited>
Process: 3603 ExecStartPre=/bin/rm -f /run/lirc/lircd (code=exited, status=0/>
Process: 3602 ExecStartPre=/bin/rm -f /dev/lircd (code=exited, status=0/SUCCE>
Process: 3601 ExecStartPre=/bin/mkdir -p /run/lirc (code=exited, status=0/SUC>
Main PID: 3622 (code=killed, signal=TERM)

Sep 26 06:59:58 imx8mmevk systemd[1]: Starting LIRC Infrared Signal Decoder...
Sep 26 06:59:58 imx8mmevk systemd[1]: Started LIRC Infrared Signal Decoder.
Sep 26 07:17:02 imx8mmevk systemd[1]: Stopping LIRC Infrared Signal Decoder...
Run mode2 and test remote control

root@imx8mmevk:~# mode2 --driver default --device /dev/lirc0
Using driver default on device /dev/lirc0
Trying device: /dev/lirc0
Using device: /dev/lirc0
Warning: Running as root.
Press button on my remote control (NEC protocol)

space 13301060
pulse 399019
space 9015
pulse 4474
space 594
pulse 1661
space 574
pulse 556
space 575
pulse 556
space 575
pulse 555
space 574
pulse 557
space 574
pulse 557
space 574
pulse 557
space 573
pulse 558
space 573
pulse 558
space 574
pulse 1663
space 573
pulse 1664
space 572
pulse 1663
space 573
pulse 1664
space 572
pulse 1663
space 573
pulse 1664
space 573
pulse 1663
space 573
pulse 1665
space 572
pulse 1664
space 573
pulse 558
space 572
pulse 1664
space 573
pulse 558
space 572
pulse 558
space 572
pulse 558
space 572
pulse 558
space 573
pulse 557
space 572
pulse 559
space 572
pulse 1665
space 571
pulse 558
space 572
pulse 1664
space 573
pulse 1663
space 572
pulse 1665
space 571
pulse 1664
space 572

But, I don't understand first and last log.
space 13301060, space 572

Start and End logic is High. (Check signal using logic analyzer)

But, mode2 first and last log is space..
I know 'space' is logic low time.
Is there anything wrong?
Please suggest me how can I supposed to solve.

Thank you.

Re: IMX8 gpio ir receiver using LIRC

igorpadykov — Fri, 01 Nov 2019 00:36:50 GMT

Hi JaeHo

one can check lirc manual LIRC - Linux Infrared Remote Control

and post issue on lirc wiki : LIRC - ArchWiki

Best regards
igor
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Re: IMX8 gpio ir receiver using LIRC

gpsri — Mon, 28 Sep 2020 08:34:29 GMT

Hi Igor,

I too facing the same problem. If you already fixed the issue could you please share your experience?

Thank you very much

topic IMX8 gpio ir receiver using LIRC in i.MX Processors

IMX8 gpio ir receiver using LIRC

Re: IMX8 gpio ir receiver using LIRC

Re: IMX8 gpio ir receiver using LIRC