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feat(firmware): onboard LED 40 Hz gamma stimulus + CSI-motion colour (ADR-183) (#1127)
* chore(deps): bump ruv-neural submodule — ColorMap no_std for ESP32 Points to ruvnet/ruv-neural#3 (c9638fa): ruv-neural-viz::ColorMap now builds no_std, so it can run on the ESP32. Unblocks driving the onboard WS2812 from the viridis/cool-warm colormap. Co-Authored-By: claude-flow <ruv@ruv.net> * feat(firmware): onboard LED as 40 Hz gamma stimulus, colour from live CSI motion (ADR-183) The S3 onboard WS2812 (GPIO 48, #962) now runs a GENUS-style 40 Hz gamma square wave (12.5 ms on/off, 50% duty). The ON-phase colour is live CSI motion (edge motion_energy) mapped through a 60-step viridis LUT generated from ruv-neural-viz::ColorMap::viridis() — still=purple, moving=yellow. Uses the now-no_std ColorMap (ruvnet/ruv-neural#3 / #1126). Hardware- confirmed on ESP32-S3 N16R8 (COM8): boot log shows the timer armed, CSI keeps flowing (27-38 pps). Honesty + photosensitivity notes + a Kconfig-gate follow-up are in ADR-183. Co-Authored-By: claude-flow <ruv@ruv.net>
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# ADR-183: Onboard LED as a 40 Hz Gamma Stimulus, Colour-Mapped from Live CSI via `ruv-neural-viz`
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| Field | Value |
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|-------|-------|
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| **Status** | Accepted — implemented & hardware-confirmed on ESP32-S3 N16R8 (COM8) |
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| **Date** | 2026-06-17 |
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| **Deciders** | ruv |
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| **Codename** | **GAMMA-VIZ** |
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| **Builds on** | `ruv-neural-viz::ColorMap` (now `no_std` — ruvnet/ruv-neural#3 / RuView#1126), the ESP32 edge `motion_energy` metric (`edge_processing.c`), PR #962 (WS2812 on GPIO 48) |
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## Context
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Two threads converged. (1) `ruv-neural-viz::ColorMap` — the viridis/cool-warm
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palette the rUv-Neural stack uses to render brain-topology graphs — was `std`-only,
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so it couldn't run on the ESP32. (2) The onboard WS2812 on the S3 CSI node was dead
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weight: the firmware only cleared it on boot (and on the wrong pin for N16R8 — GPIO
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38 vs the actual 48, see #962).
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The ask: make the LED do something real and honest, using the project's own visual
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capability — not a decorative blink. The natural fit is a **40 Hz gamma stimulus**
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(the GENUS gamma-entrainment frequency from Alzheimer's light-therapy research)
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whose **colour is driven by live sensed motion**, so the node's front panel is both
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a known bio-stimulus waveform and a truthful readout of what the CSI is detecting.
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## Decision
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### Part A — make `ColorMap` `no_std`
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`colormap.rs` is self-contained (no cross-crate deps), so expose it on `no_std`
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targets. The only blockers were two `std`-only `f64` ops:
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- `f64::round` / `f64::abs` → replaced with `core`+`alloc`-safe helpers `fround`
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(round via `f64 as i64` truncation — a `core` cast, no `libm`) and `fabs`.
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- `Vec`/`String`/`format!` → from `alloc`.
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The graph-bound modules (`animation`/`ascii`/`export`/`layout`) and their heavy deps
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move behind a default `std` feature; `--no-default-features` builds the crate `no_std`
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and exposes only `colormap`. Output is **byte-identical** (8/8 colormap tests pass with
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the same RGB values), so this is a pure portability change.
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### Part B — the LED stimulus (firmware)
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`firmware/esp32-csi-node/main/main.c`, on boot:
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- WS2812 on **GPIO 48** (N16R8 / DevKitC-1 v1.1; GPIO 8 on C6).
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- An `esp_timer` periodic at **12 500 µs toggles a square wave → 40 Hz, 50 % duty**
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(full-on / full-off — a *perceptible* gamma flicker, not a colour drift).
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- **ON-phase colour = live CSI motion.** Each ON phase reads `edge_get_vitals().motion_energy`,
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normalises it (`/ LED_MOTION_FULLSCALE`, clamped `[0,1]`), and indexes a **60-step
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viridis LUT generated from `ColorMap::viridis().map()`** — still = dark purple,
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strong motion = yellow.
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The LUT is baked from the real crate (Part A makes the same `ColorMap` embeddable
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for a future direct FFI path once the ESP Rust toolchain is in CI). The colours are
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therefore provably `ruv-neural-viz`'s, and the motion is provably real.
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## Honesty (what it is and is not)
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- **40 Hz is a real square-wave stimulus** (12.5 ms on / 12.5 ms off), not a label on
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a colour sweep. It is *not* tied to any measured 40 Hz brain rhythm — it is an
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*output* stimulus at the gamma frequency, not a readout of neural gamma.
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- **Colour is a real CSI readout** — `motion_energy` is the on-device phase-variance
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motion metric the node already computes; no fabrication. At rest the LED sits at the
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purple (low) end and flickers there.
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- No therapeutic claim is made. 40 Hz GENUS entrainment is cited as the *origin of the
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frequency choice*, not as a validated medical effect of this device.
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## Consequences
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**Positive**
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- The LED is now an honest front-panel: gamma-frequency flicker + a live motion readout.
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- `ColorMap` is embeddable (`no_std`), unblocking on-device use of the rUv-Neural
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palette beyond this LED.
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- Confirms #962's GPIO-48 fix visually (the LED lights on N16R8).
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**Negative / risks**
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- Changes *default* firmware behaviour: the onboard LED now animates instead of staying
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off (minor power + a visible flicker some may not want). Gate behind a Kconfig
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(`CONFIG_LED_GAMMA_VIZ`) if a dark default is preferred — follow-up.
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- A 40 Hz flicker can be an issue for photosensitive users; document on the enclosure.
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- `LED_MOTION_FULLSCALE` (0.25) is hand-tuned, not calibrated per-environment.
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- The colour uses a baked LUT, not the live Rust `ColorMap` (FFI path deferred — needs
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the ESP Rust/xtensa toolchain, not yet in CI).
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## Validation
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- `ruv-neural-viz`: `cargo build` (std) ✓, `cargo test colormap` 8/8 ✓ (identical RGB),
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`cargo build --no-default-features` compiles `no_std` ✓.
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- Firmware: built (1.13 MB), flashed to ESP32-S3 N16R8 (COM8). Boot log:
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`Onboard WS2812: 40 Hz gamma flicker (GENUS), colour=CSI motion via ruv-neural-viz, GPIO 48`;
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CSI continues (27–38 pps), `motion=0.00` at rest → purple flicker as designed.
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- Full on-device (xtensa) Rust build of `ColorMap` not run — ESP Rust toolchain absent.
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## References
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- ruvnet/ruv-neural#3 (ColorMap no_std), RuView#1126 (submodule bump), #962 (GPIO 48).
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- Singer/Tsai GENUS 40 Hz gamma entrainment (origin of the frequency, not a device claim).
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