LIRC Setup for IR Blaster with Ubuntu 16.04

$ sudo apt-get install lirc

While installing lirc, you will be asked about the device type of IR receiver and transmitter.
Since we will set up later manually, just select None.

lirc_odroid module driver is already included by default.
Now you need to set up hardware.conf and lircd.conf first and then probe the modules with some parameters.

LIRC Configuration (1) - hardware.conf

hardware.conf is generated by default when lirc is installed
and in this conf file, devices and drivers information is supposed to be specified.

$ sudo vi /etc/lirc/hardware.conf

Specify the kernel driver module and its node.

#Chosen IR Transmitter
TRANSMITTER="odroid blaster"
TRANSMITTER_MODULES="lirc_odroid lirc_dev"
TRANSMITTER_DRIVER=""
TRANSMITTER_DEVICE="/dev/lirc0"
TRANSMITTER_SOCKET=""
TRANSMITTER_LIRCD_CONF=""
TRANSMITTER_LIRCD_ARGS=""

Please refer to this link for the whole contents of hardware.conf.
hardware.conf

LIRC Configuration (2) - lircd.conf

lircd.conf is also generated automatically via the Ubuntu LIRC package scripts.
It includes signal timing information and provides a mapping from button presses to key symbols.
You can modify this file based on your custom remote controller.

$ sudo vi /etc/lirc/lircd.conf

This reference lircd.conf is generated to support Hardkernel IR remote controller.
lircd.conf
https://www.hardkernel.com/shop/ir-remote-controller/

begin remote
    name odroid
    bits   16
    .....
    .....


Install module and Run lirc service

All necessary configuration is done, you need to install lirc_odroid module and set some parameters.

# The usage of lirc_odroid module
lirc_odroid  gpio_out_pin=${gpio_number} invert=[0 or 1] softcarrier=[0 or 1]
1. ODROID-C2 Example

Supposing to use Pin#11 of ODROID-C2 (GPIO #247),

$ service lirc stop
$ modprobe lirc_dev
$ modprobe lirc_odroid gpio_out_pin=247 softcarrier=1 invert=1
(automatically, service lirc will be started)
2. ODROID-C1/C1+ Example

Supposing to use Pin#7 of ODROID-C1/C1+ (GPIO #83),

$ service lirc stop
$ modprobe lirc_dev
$ modprobe lirc_odroid gpio_out_pin=83 softcarrier=1 invert=1
(automatically, service lirc will be started)
3. ODROID-XU4 Example

Supposing to use Pin#26 of ODROID-XU4 (GPIO #24),

$ service lirc stop
$ modprobe lirc_dev
$ modprobe lirc_odroid gpio_out_pin=24 softcarrier=1 invert=1
(automatically, service lirc will be started)


If you have the warning No such device during modprobe lirc_odroid,
check if the gpio_out_pin is already assigned to another purpose and change to another pins.


Send IR code using 'irsend'

If lirc_odroid module has been loaded and lirc service is running normally, you can get the key list as following.
Please make sure the remote name is same with the name described in /etc/lirc/lircd.conf.

$ irsend LIST odroid ""
irsend: 0000000000009966 KEY_LEFT
irsend: 000000000000837c KEY_RIGHT
irsend: 00000000000053ac KEY_UP
irsend: 0000000000004bb4 KEY_DOWN
irsend: 000000000000738c KEY_ENTER
irsend: 00000000000041be KEY_HOME
irsend: 00000000000011ee KEY_MUTE
irsend: 000000000000a35c KEY_MENU
irsend: 00000000000059a6 KEY_BACK
irsend: 000000000000817e KEY_VOLUMEDOWN
irsend: 00000000000001fe KEY_VOLUMEUP
irsend: 0000000000003bc4 KEY_POWER

irsend is basic LIRC program to send the key code.

$ irsend SEND_ONCE odroid KEY_ENTER

For more detailed information, please refer to this link.
http://www.lirc.org/html/irsend.html

hardware.conf

hardware.conf
# /etc/lirc/hardware.conf
#
#Chosen Remote Control
REMOTE="None"
REMOTE_MODULES=""
REMOTE_DRIVER=""
REMOTE_DEVICE=""
REMOTE_SOCKET=""
REMOTE_LIRCD_CONF=""
REMOTE_LIRCD_ARGS=""
 
#Chosen IR Transmitter
TRANSMITTER="odroid blaster"
TRANSMITTER_MODULES="lirc_odroid lirc_dev"
TRANSMITTER_DRIVER=""
TRANSMITTER_DEVICE="/dev/lirc0"
TRANSMITTER_SOCKET=""
TRANSMITTER_LIRCD_CONF=""
TRANSMITTER_LIRCD_ARGS=""
 
#Disable kernel support.
#Typically, lirc will disable in-kernel support for ir devices in order to
#handle them internally.  Set to false to prevent lirc from disabling this
#in-kernel support. 
#DISABLE_KERNEL_SUPPORT="true"
 
#Enable lircd
START_LIRCD="true"
 
#Don't start lircmd even if there seems to be a good config file
#START_LIRCMD="false"
 
#Try to load appropriate kernel modules
LOAD_MODULES="true"
 
# Default configuration files for your hardware if any
LIRCMD_CONF=""
 
#Forcing noninteractive reconfiguration
#If lirc is to be reconfigured by an external application
#that doesn't have a debconf frontend available, the noninteractive
#frontend can be invoked and set to parse REMOTE and TRANSMITTER
#It will then populate all other variables without any user input
#If you would like to configure lirc via standard methods, be sure
#to leave this set to "false"
FORCE_NONINTERACTIVE_RECONFIGURATION="false"
START_LIRCMD=""

lircd.conf

lircd.conf
begin remote
 
name odroid
bits 16
flags SPACE_ENC|CONST_LENGTH
eps  30
aeps 100
 
header 9000 4500
one 563 1688
zero 563 564
ptrail 563
pre_data_bits 16
pre_data 0x4DB2
repeat 9000 2250
gap 100000
toggle_bit_mask 0x0
    begin codes
        KEY_LEFT  0x9966
        KEY_RIGHT  0x837C
        KEY_UP  0x53AC
        KEY_DOWN  0x4BB4
        KEY_ENTER  0x738C
        KEY_HOME  0x41BE
        KEY_MUTE  0x11EE
        KEY_MENU  0xA35C
        KEY_BACK  0x59A6
        KEY_VOLUMEDOWN  0x817E
        KEY_VOLUMEUP  0x01FE
        KEY_POWER  0x3BC4
    end codes
end remote
To support both of IR Tx and Rx simultaneously
#Chosen Remote Control
REMOTE="None"
REMOTE_MODULES="meson-ir"
REMOTE_DRIVER=""
REMOTE_DEVICE="/dev/lirc0"
REMOTE_SOCKET=""
REMOTE_LIRCD_CONF=""
REMOTE_LIRCD_ARGS="--uinput"

#Chosen IR Transmitter
TRANSMITTER="Home-brew (odroid gpio)"
TRANSMITTER_MODULES="lirc_odroid lirc_dev"
TRANSMITTER_DRIVER=""
TRANSMITTER_DEVICE="/dev/lirc1"
TRANSMITTER_SOCKET=""
TRANSMITTER_LIRCD_CONF=""
TRANSMITTER_LIRCD_ARGS=""
...
...