Heinrich Toews b197308901 tools: leds: add m4-led-perf-test.sh
Bash/sh script (BusyBox compatible) to stress-test the WAGO M4 RGB LED
strip driver by activating kernel LED triggers on all ten strip LEDs
(sys, run, io, em, u1-u6).

Three trigger modes selectable via --trigger=<mode>:

  pattern   (default)
    Phase 1 - FADE:       staggered smooth brightness ramp (200 ms
              offset per LED) using the pattern trigger
    Phase 2 - FAST FLASH: 50 ms on/off in distinct colours per LED
    Phase 3 - SLOW FLASH: 400 ms on/off with colour cycling

  timer
    Simple on/off blink with staggered delay_on/delay_off values
    (50 ms .. 500 ms) and per-LED colours.

  heartbeat
    Kernel heartbeat trigger, all LEDs white.

Additional options:
  --duration=<sec>   Total test duration in seconds (default: 30)
  --version          Print version string
  --help             Print usage

Cleanup handler (trap INT/TERM) restores trigger=none + brightness=0
on all LEDs when the test ends or is interrupted.

Signed-off-by: Heinrich Toews <ht@twx-software.de>
2026-06-18 14:31:31 +02:00
2025-06-20 09:56:35 -05:00
2025-06-20 10:23:09 -05:00
2025-06-19 15:28:47 +02:00

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.
S
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