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.
