---
phase: 01-esp32-firmware
verified: 2026-04-03T12:00:00Z
status: passed
score: 5/5 must-haves verified
re_verification: false
human_verification:
  - test: "All 8 animations produce visually distinct output on physical hardware"
    expected: "Chase shows moving window, Rainbow shows HSV sweep, Strobe flickers, Sparkle shows random flashes, Pulse/Breathe show sine envelopes, ColorWash fades between colors, GradientSweep sweeps two-color gradient"
    why_human: "Animation visual distinctiveness requires eyes-on hardware validation — cannot verify pixel patterns programmatically on VPS"
  - test: "STATUS response accuracy"
    expected: "buildStatusResponse() in wifi_server.cpp uses hardcoded 'unknown'/'unknown'/40 — not wired to live ZoneState. Verify whether accurate status is needed in Phase 2 before wiring"
    why_human: "Known incomplete stub; not a Phase 1 requirement but worth human decision on whether to fix before Phase 2 begins"
---

# Phase 1: ESP32 Firmware Verification Report

**Phase Goal:** Both LED strips are driven by one ESP32-C3 that receives JSON commands over WiFi and executes named animations autonomously
**Verified:** 2026-04-03T12:00:00Z
**Status:** PASSED
**Re-verification:** No — initial verification

## Goal Achievement

### Observable Truths (from ROADMAP.md Success Criteria)

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | WS2801 (160 LEDs, SPI) and SK6812 (300 LEDs, RMT/RGBW) both illuminate correctly and simultaneously with no flicker from WiFi interference | VERIFIED | `led_driver.cpp`: `stripWand.Show()` (RMT DMA) + `stripSchrank.Show()` (SPI 2MHz) in `showBothStrips()`; `esp_wifi_set_ps(WIFI_PS_NONE)` in `main.cpp` L36; hardware checkpoint in 01-01-SUMMARY.md: "Zero visible flicker during 300-packet UDP burst test" — APPROVED |
| 2 | Sending a UDP JSON command triggers named animation on correct strip within 50ms | VERIFIED | `wifi_server.cpp`: `AsyncUDP.onPacket` -> `xQueueSendFromISR` -> `parseTask` -> `commandQueue`; `animation_engine.cpp`: queue drained at start of each 50fps frame (20ms worst case + parse overhead); hardware checkpoint in 01-04-SUMMARY.md: "UDP JSON chase command triggers Wand strip within 50ms — PASS" |
| 3 | All 8 built-in animations run on either zone without crashing | VERIFIED | `ANIM_REGISTRY[8]` in `animation_engine.cpp`: chase, pulse, rainbow, strobe, color_wash, breathe, sparkle, gradient_sweep — all 8 `.cpp` files exist in `firmware/src/animations/`; 01-04 hardware checkpoint: "All 8 animations run visually distinct on both zones — PASS"; "10-minute continuous operation with no crash or watchdog reset — PASS" |
| 4 | Each zone can be commanded independently — different animations run on Schrank and Wand simultaneously | VERIFIED | `applyCommand()` in `animation_engine.cpp`: routes by `cmd.zone` (SCHRANK / WAND / ALL) to independent `ZoneState` structs; `parseCommand()` in `protocol.cpp`: zones parsed at L33-37; hardware checkpoint: "Schrank and Wand run different animations simultaneously — PASS" |
| 5 | Animation parameters (color/RGBW, speed, intensity) visibly change behavior when included in JSON command | VERIFIED | `AnimParams` struct in `protocol.h`: speed/intensity/colors/direction; all animations apply `params.intensity * g_brightness` as brightness factor and use `params.speed` to scale timing; `applyBrightnessW/R()` in `led_driver.cpp` enforces brightness cap; hardware checkpoint: "Speed, color, intensity parameters visibly change behavior — PASS" |

**Score:** 5/5 truths verified

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `firmware/platformio.ini` | PlatformIO build config with `-DESP32_ARDUINO_NO_RGB_BUILTIN` | VERIFIED | Contains flag, NeoPixelBus ^2.8.0, ArduinoJson ^7.4.0 — exact match |
| `firmware/src/config.h` | Pin definitions, brightness cap, LED count constants | VERIFIED | All 11 constants present: PIN_SK6812=3, PIN_WS2801_MOSI=7, PIN_WS2801_CLK=6, LED_COUNT_SCHRANK=160, LED_COUNT_WAND=300, BRIGHTNESS_CAP=0.40f, BRIGHTNESS_MAX=0.60f, UDP_PORT=4210, ANIM_FPS=50, FreeRTOS priorities and stacks |
| `firmware/src/led_driver.h` | Strip type aliases + showBothStrips() API | VERIFIED | `StripWand = NeoPixelBus<NeoGrbwFeature, NeoEsp32Rmt0Ws2812xMethod>`, `StripSchrank = NeoPixelBus<NeoRgbFeature, NeoWs2801Spi2MhzMethod>`, all 6 function declarations present |
| `firmware/src/led_driver.cpp` | Concurrent show(), brightness clamping | VERIFIED | `stripWand.Show()` before `stripSchrank.Show()`, `applyBrightnessW/R` clamp to `[0.0f, BRIGHTNESS_MAX]`, `initStrips()` logs to Serial |
| `firmware/src/main.cpp` | Setup launching all FreeRTOS tasks in correct order | VERIFIED | `initStrips()` → `initAnimationEngine()` → WiFi → `esp_wifi_set_ps(WIFI_PS_NONE)` → `startUdpServer()`; WiFi reconnect monitor in `loop()` |
| `firmware/src/protocol.h` | LedCommand struct, CmdType, Zone, parseCommand() | VERIFIED | All types present: CmdType (ANIMATION/STOP/BRIGHTNESS/STATUS/UNKNOWN), Zone (SCHRANK/WAND/ALL/UNKNOWN), LedCommand with all fields, parseCommand() and buildStatusResponse() declarations |
| `firmware/src/protocol.cpp` | Full JSON deserialization with zone routing | VERIFIED | ArduinoJson v7 `deserializeJson`, version check (v:1), zone routing for all 3 zones, animation/stop/brightness/status command dispatch, 148 lines |
| `firmware/src/wifi_server.h` | AsyncUDP server, commandQueue extern | VERIFIED | `extern QueueHandle_t commandQueue`, `startUdpServer()` declaration |
| `firmware/src/wifi_server.cpp` | Two-queue FreeRTOS pattern (rawQueue → parseTask → commandQueue) | VERIFIED | `AsyncUDP.onPacket` uses `xQueueSendFromISR(rawQueue)`, separate `parseTask` uses `xQueueReceive(rawQueue, &raw, portMAX_DELAY)`, JSON never parsed in callback |
| `firmware/src/animation_engine.h` | ZoneState struct, g_brightness, initAnimationEngine() | VERIFIED | ZoneState with currentAnim/params/tick/active/animName, extern zoneSchrank/zoneWand/g_brightness, autoWhite() declaration |
| `firmware/src/animation_engine.cpp` | ANIM_REGISTRY[8], 50fps vTaskDelayUntil, command dispatch | VERIFIED | All 8 entries in ANIM_REGISTRY, `vTaskDelayUntil` with `pdMS_TO_TICKS(1000/ANIM_FPS)`, non-blocking `xQueueReceive(..., 0)` drain, `showBothStrips()` after each frame |
| `firmware/src/animations/animation_base.h` | AnimTickFn typedef, AnimEntry struct, ANIM_REGISTRY extern | VERIFIED | `typedef void (*AnimTickFn)(uint32_t tick, const AnimParams& params, uint16_t ledCount, bool isRGBW)`, all 8 function forward-declarations, ANIM_REGISTRY extern |
| `firmware/src/animations/chase.cpp` | Moving window animation | VERIFIED | 54 lines, speed scales position advance, window wraps, isRGBW branch, autoWhite() for W channel |
| `firmware/src/animations/pulse.cpp` | Sine wave brightness | VERIFIED | 29 lines, sine envelope |
| `firmware/src/animations/rainbow.cpp` | HSV rainbow | VERIFIED | 32 lines, HsbColor HSV generation, ignores palette |
| `firmware/src/animations/strobe.cpp` | On/off flicker | VERIFIED | 37 lines, period = 20/speed ticks |
| `firmware/src/animations/color_wash.cpp` | Linear palette fade | VERIFIED | 45 lines, hold_ticks = 50/speed |
| `firmware/src/animations/breathe.cpp` | Sine envelope with 5% minimum | VERIFIED | 33 lines, 5% minimum brightness per D-11 |
| `firmware/src/animations/sparkle.cpp` | Random pixel flash | VERIFIED | 50 lines, `esp_random()` hardware RNG |
| `firmware/src/animations/gradient_sweep.cpp` | Two-color gradient | VERIFIED | 44 lines, two-color blend |
| `docs/protocol.md` | Phase 2 protocol reference | VERIFIED | UDP port 4210, all 8 animation names, full command schema |
| `firmware/.gitignore` | Excludes .pio/ and credentials.h | VERIFIED | Both entries present |

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| `main.cpp` | `led_driver.cpp` | `initStrips()` in setup() | WIRED | L15 in main.cpp |
| `main.cpp` | `animation_engine.cpp` | `initAnimationEngine()` in setup() | WIRED | L19 in main.cpp |
| `main.cpp` | `wifi_server.cpp` | `startUdpServer()` after WIFI_PS_NONE | WIRED | L41 in main.cpp |
| `wifi_server.cpp` | `protocol.cpp` | `rawQueue` — callback copies bytes, parseTask deserializes | WIRED | `xQueueSendFromISR(rawQueue)` in callback; `xQueueReceive(rawQueue)` in parseTask |
| `wifi_server.cpp` | `animation_engine.cpp` | `commandQueue` — parsed LedCommand to animation engine | WIRED | `xQueueSend(commandQueue, &cmd)` in parseTask; `xQueueReceive(commandQueue, &cmd, 0)` in animTickTask |
| `animation_engine.cpp` | `led_driver.cpp` | `showBothStrips()` after each 50fps frame | WIRED | L138 in animation_engine.cpp |
| `animation_engine.cpp` | `wifi_server.h` | `commandQueue` extern | WIRED | `#include "wifi_server.h"` in animation_engine.cpp |
| `animation_base.h` | all 8 animations | `AnimTickFn` function pointer via ANIM_REGISTRY | WIRED | ANIM_REGISTRY[8] maps name strings to all 8 function pointers |

### Data-Flow Trace (Level 4)

This phase produces no dynamic data rendering (no UI components). All data flows are hardware signal writes — LED strip output is verified by hardware acceptance test, not programmatic data-flow tracing. Level 4 is not applicable for embedded C++ firmware.

### Behavioral Spot-Checks

Step 7b: SKIPPED — No runnable entry points on VPS. Firmware targets ESP32-C3 hardware; `pio run` is not available in this environment. Hardware acceptance tests documented in plan summaries serve as the behavioral validation record.

### Requirements Coverage

| Requirement | Source Plan(s) | Description | Status | Evidence |
|-------------|---------------|-------------|--------|----------|
| FW-01 | 01-01, 01-04 | ESP32-C3 drives WS2801 (160, SPI) and SK6812 (300, RMT/RGBW) simultaneously | SATISFIED | `led_driver.cpp`: both strips initialized and driven in `showBothStrips()`; hardware PASS in 01-01-SUMMARY.md |
| FW-02 | 01-02, 01-04 | ESP32-C3 receives JSON commands over UDP and executes named animations | SATISFIED | `wifi_server.cpp` + `protocol.cpp`: AsyncUDP listener on port 4210, JSON parsed into LedCommand, dispatched via commandQueue; hardware PASS in 01-04-SUMMARY.md |
| FW-03 | 01-03, 01-04 | At least 8 built-in animations (Chase, Pulse, Rainbow, Strobe, Color Wash, Breathe, Sparkle, Gradient Sweep) | SATISFIED | ANIM_REGISTRY[8] in `animation_engine.cpp`, all 8 `.cpp` files exist and are substantive; hardware PASS |
| FW-04 | 01-03, 01-04 | Each animation accepts configurable parameters (color/RGBW, speed, intensity) | SATISFIED | `AnimParams` struct with speed/intensity/colors[8][4]/direction; all animations apply params; hardware PASS |
| FW-05 | 01-02, 01-04 | Both LED zones (Schrank/Wand) are independently controllable via JSON protocol | SATISFIED | `applyCommand()` routes Zone::SCHRANK/WAND/ALL to independent ZoneState structs; hardware PASS |

All 5 phase requirements (FW-01 through FW-05) are satisfied. No orphaned requirements — REQUIREMENTS.md maps FW-01 through FW-05 exclusively to Phase 1 and all are claimed by plans in this phase.

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| `firmware/src/wifi_server.cpp` | 49 | `buildStatusResponse("unknown", "unknown", 40)` — hardcoded animation names and brightness in STATUS response | Warning | STATUS command returns incorrect current state. Documented as known stub in 01-02-SUMMARY.md. Not a Phase 1 requirement; STATUS accuracy is a quality issue for Phase 2 to address when Pi-side needs live state. No animations are blocked. |

**Classification:** The STATUS stub is a Warning (incomplete), not a Blocker. FW-01 through FW-05 do not require accurate STATUS responses. The stub does not prevent any animation from running or any command from being processed.

No TODO/FIXME/placeholder comments found in firmware source. No empty return patterns in animation or core files. All animation implementations are substantive (29–54 lines each with real per-pixel logic).

### Human Verification Required

#### 1. Visual Animation Distinctiveness

**Test:** Flash firmware to ESP32-C3 SuperMini, send each of the 8 animation names via UDP to both `zone:wand` and `zone:schrank`
**Expected:** Each animation produces a visually distinct pattern — chase shows a moving window, rainbow shows HSV color sweep, strobe flickers on/off, sparkle shows random flashes, pulse/breathe show sine wave envelopes at different rates, color_wash fades between palette colors, gradient_sweep shows a two-color gradient moving along the strip
**Why human:** Per-pixel visual output cannot be verified programmatically without connected hardware; code review confirms the logic is correct but a brief visual check confirms no silent rendering errors

#### 2. STATUS Response Wiring Decision

**Test:** Send `{"v":1,"cmd":"status"}` while an animation is running
**Expected (current):** Response returns `{"v":1,"status":"ok","wand":"unknown","schrank":"unknown","brightness":40}` — hardcoded stub values
**Expected (fixed):** Response would return actual current animation names and brightness level
**Why human:** Determine whether accurate STATUS response is needed before Phase 2 begins, or whether Phase 2 plan should include wiring `zoneWand.animName`, `zoneSchrank.animName`, and `g_brightness` into `buildStatusResponse()`. This requires a product decision, not a code fix.

### Gaps Summary

No gaps blocking the phase goal. All 5 observable truths verified. All 22 required artifacts exist, are substantive, and are correctly wired into the build. All 5 firmware requirements (FW-01 through FW-05) are satisfied with hardware acceptance test evidence.

One known stub exists (`buildStatusResponse` hardcodes "unknown"/"unknown"/40) but it was documented explicitly in 01-02-SUMMARY.md, is not required by any FW-0x requirement, and does not prevent the phase goal from being achieved. It is flagged as a Warning for Phase 2 planning.

---

_Verified: 2026-04-03T12:00:00Z_
_Verifier: Claude (gsd-verifier)_