Section: User Commands (1)
Updated: Last change: Aug 2015
mode2 - Show pulse/space length or decoded input from infrared drivers.
mode2 --driver <driver> --device <device> [other options]
mode2 --raw --device <device> [other options]
The main purpose of this program is to check operation of your home-brew LIRC receiver hardware and to see the IR waveform of the remote controller without an expensive oscilloscope. Very useful for debugging also in situations you just need to verify configuration.
mode2 will simply print pulse and space lengths to stdout for drivers supporting LIRC_MODE_MODE2. For drivers supporting LIRC_MODE_LIRCCODE such as TV-cards and the irman driver writes the decoded, integer values.
When given the correct driver mode2 should always work. Without a driver, the --raw option should always work for /dev/lirc* devices. At the time of writing, usb devices also work in most cases. However, since it is tricky to get the path to the usb device, such ones are normally best accessed using a driver.
In many cases mode2 needs to run as root to access devices not available to regular users. On the other hand, running as root creates problems such as log files owned by root, security concerns etc.
In order to cope with this, mode2 by default drops root privileges after opening the input device. This support is based on that root permissions are accquired using sudo(1) e. g., using
$ sudo mode2 --raw /dev/lirc0
If not using sudo, the same behaviour could be accomplished using the SUDO_USER environment variable e. g.,
# SUDO_USER=$LOGNAME mode2 --raw /dev/lirc0
The --keep-root option will make mode2 to keep root privileges for the complete run.
Drivers are loaded dynamically. The search path used for this is determined by (falling priority):
The documentation for lirc is maintained as html pages. They are located under html/ in the documentation directory.
This document was created by
using the manual pages.
Time: 10:37:09 GMT, September 03, 2015