NAME

       gpiomon - libgpiod command-line utility

SYNOPSIS

       gpiomon [OPTIONS] <line>...

DESCRIPTION

       Wait for events on GPIO lines and print them to standard output.

       Lines are specified by name, or optionally by offset if the chip option is provided.

OPTIONS

       --banner
              display a banner on successful startup

       -b, --bias <bias>
              specify  the  line bias Possible values: 'pull-down', 'pull-up', 'disabled'.  (default is to leave
              bias unchanged)

       --by-name
              treat lines as names even if they would parse as an offset

       -c, --chip <chip>
              restrict scope to a particular chip

       -C, --consumer <name> consumer name applied to requested lines (default is 'gpiomon')

       -e, --edges <edges>
              specify the edges to monitor Possible values: 'falling', 'rising', 'both'.  (default is 'both')

       -E, --event-clock <clock>
              specify the source clock for event timestamps Possible  values:  'monotonic',  'realtime',  'hte'.
              (default is 'monotonic') By default 'realtime' is formatted as UTC, others as raw u64.

       -h, --help
              display this help and exit

       -F, --format <fmt>
              specify a custom output format

       --idle-timeout <period>
              exit gracefully if no events occur for the period specified

       -l, --active-low
              treat the line as active low, flipping the sense of rising and falling edges

       --localtime
              format event timestamps as local time

       -n, --num-events <num>
              exit after processing num events

       -p, --debounce-period <period>
              debounce the line(s) with the specified period

       -q, --quiet
              don't generate any output

       -s, --strict
              abort if requested line names are not unique

       --unquoted
              don't quote line or consumer names

       --utc  format event timestamps as UTC (default for 'realtime')

       -v, --version
              output version information and exit

   Chips:
              A   GPIO  chip  may  be  identified  by  number,  name,  or  path.   e.g.  '0',  'gpiochip0',  and
              '/dev/gpiochip0' all refer to the same chip.

   Periods:
              Periods are taken as milliseconds unless units are specified. e.g. 10us.  Supported units are 'm',
              's', 'ms', and 'us' for minutes, seconds, milliseconds and microseconds respectively.

   Format specifiers:
       %o     GPIO line offset

       %l     GPIO line name

       %c     GPIO chip name

       %e     numeric edge event type ('1' - rising or '2' - falling)

       %E     edge event type ('rising' or 'falling')

       %S     event timestamp as seconds

       %U     event timestamp as UTC

       %L     event timestamp as local time

AUTHOR

       Bartosz Golaszewski <brgl@bgdev.pl>

REPORTING BUGS

       Report bugs to:
           Bartosz Golaszewski <brgl@bgdev.pl>
           linux-gpio <linux-gpio@vger.kernel.org>

COPYRIGHT

       Copyright © 2017-2023 Bartosz Golaszewski License: GPL-2.0-or-later
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to  the  extent
       permitted by law.

libgpiod v2.2.1                                    March 2025                                         GPIOMON(1)