From 7994bb2b6bfc1586b4a53e0d72ebb1da93733333 Mon Sep 17 00:00:00 2001
From: Selene ToyKeeper
Date: Sun, 22 Sep 2024 18:01:28 -0600
Subject: hank-lume-x1: minor calibration and cleaning - calibrated party
 strobe - removed duplicate or commented-out code - added a basic readme

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 hw/hank/lume-x1/readme.md | 34 ++++++++++++++++++++++++++++++++++
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 create mode 100644 hw/hank/lume-x1/readme.md

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+# Hank / loneoceans Lume X1 40W
+
+Regulated boost driver for Hank lights (Emisar / Noctigon) by loneoceans.
+
+Second Hank light to use the new avr32dd20 MCU.  Performs better than older
+MCUs and provides more space for extra features and future firmware updates.
+
+Originally from https://github.com/loneoceans/anduril
+
+Features UDR (Ultra Dynamic Range) for smooth dimming all the way down to
+*literally zero*, meaning an effectively infinite dimming ratio:
+
+- 3 power paths or "gears" for the regulator chip's sense resistors:
+  - Firefly "gear": 0 to ~0.1 lm
+  - Low "gear": ~0.1 to ~40 lm
+  - High "gear": ~40 lm to full power (2k or 3k lm?)
+- Internal resolution of 2500 steps per "gear" allows very precise control over
+  brightness.  Anduril's 150 step ramp does not fully take advantage of this.
+- Constant current, no pulsing or flicker or ripple
+- No preflash
+- No need for jump start; regulator has a quick response at all levels
+
+The firefly part of the ramp is compressed to just a few levels, to avoid
+making the rest of the ramp artificially low.  It aims to be reasonably
+consistent compared to the ramp shape of Hank's other lights, but a few levels
+at the bottom are set aside for moon and firefly modes.
+
+The regulator can go much, much lower than the brightness of the button LEDs,
+but there isn't much point because the glowing button overpowers the main LEDs.
+The button and aux LEDs (on low) also use significantly less power despite
+being brighter, because they do not require the MCU to be awake.  So that part
+of the ramp is mostly omitted.  However, it can be added with a firmware
+modification if desired.
+
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