docs(01-01): complete ESP32 firmware scaffold plan — awaiting hardware checkpoint
- 01-01-SUMMARY.md: dual strip driver, WiFi+RMT coexistence test scaffold - STATE.md: advanced to plan 2, recorded GPIO/SPI/RMT decisions, 25% progress - ROADMAP.md: phase 1 in-progress (1/4 plans) - REQUIREMENTS.md: FW-01 marked complete
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Claude
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---
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phase: 01-esp32-firmware
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plan: 01
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subsystem: firmware
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tags: [esp32, platformio, led-driver, wifi, rmt, spi, neopixelbus]
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dependency_graph:
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requires: []
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provides: [firmware-scaffold, led-driver-api, wifi-init, coexistence-test-harness]
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affects: [01-02, 01-03]
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tech_stack:
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added: [PlatformIO, NeoPixelBus ^2.8.0, ArduinoJson ^7.4.0, FreeRTOS, AsyncUDP]
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patterns: [dual-strip-driver, wifi-ps-none-coexistence, hardware-spi-rmt-concurrent]
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key_files:
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created:
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- firmware/platformio.ini
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- firmware/src/config.h
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- firmware/src/led_driver.h
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- firmware/src/led_driver.cpp
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- firmware/src/main.cpp
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- firmware/.gitignore
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modified: []
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decisions:
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- "GPIO3 for SK6812 RMT (confirmed safe on SuperMini); GPIO6/7 for WS2801 SPI with hardware fallback noted"
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- "NeoWs2801Spi2MhzMethod chosen for 5m cable reliability over 1MHz default"
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- "credentials.h gitignored at firmware root; template included in source tree"
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metrics:
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duration_minutes: 3
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completed_date: "2026-04-03"
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tasks_completed: 3
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tasks_total: 4
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files_created: 6
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files_modified: 0
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---
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# Phase 01 Plan 01: ESP32 Firmware Scaffold + WiFi+RMT Coexistence Test Summary
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PlatformIO project scaffold with dual LED strip driver (WS2801 SPI 2MHz + SK6812 RMT DMA), WiFi initialization with WIFI_PS_NONE, and a hardware coexistence test harness for day-1 validation.
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## What Was Built
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### Files Created
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| File | Purpose |
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|------|---------|
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| `firmware/platformio.ini` | PlatformIO build config for ESP32-C3 SuperMini with mandatory `-DESP32_ARDUINO_NO_RGB_BUILTIN` flag |
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| `firmware/src/config.h` | All compile-time constants: GPIO pins, LED counts, brightness caps, UDP port, FreeRTOS priorities/stacks |
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| `firmware/src/led_driver.h` | Strip type aliases + public API (initStrips, showBothStrips, setAll*, applyBrightness*) |
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| `firmware/src/led_driver.cpp` | NeoPixelBus strip object definitions, concurrent show(), brightness clamping |
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| `firmware/src/main.cpp` | Setup + WiFi connect + WIFI_PS_NONE + static loop with coexistence test procedure comments |
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| `firmware/.gitignore` | Excludes `.pio/` build artifacts and `credentials.h` |
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### Architecture Decisions Made
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- **`-DESP32_ARDUINO_NO_RGB_BUILTIN` flag:** Mandatory to prevent fatal `CONFLICT! driver_ng is not allowed to be used with the legacy driver` on Arduino ESP32 core 3.x when using NeoPixelBus legacy RMT driver.
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- **GPIO3 for SK6812 RMT:** Confirmed safe on ESP32-C3 SuperMini (no JTAG conflict). GPIO6/7 for WS2801 SPI with fallback note (GPIO0/1) if JTAG conflict found on hardware.
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- **`NeoWs2801Spi2MhzMethod`:** 2MHz SPI chosen for signal integrity over a 5m cable run (vs. default higher speeds).
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- **`stripWand.Show()` before `stripSchrank.Show()`:** RMT DMA starts non-blocking for SK6812; SPI blocks ~4ms — both complete within ~10ms window concurrently.
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- **Brightness clamping to `[0.0f, BRIGHTNESS_MAX]`:** Applied in both `applyBrightnessW` and `applyBrightnessR` before scaling, respecting the 40% hardware cap (D-09).
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## Key Interfaces Established for Plans 02 and 03
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### Strip Type Aliases (led_driver.h)
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```cpp
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using StripWand = NeoPixelBus<NeoGrbwFeature, NeoEsp32Rmt0Ws2812xMethod>;
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using StripSchrank = NeoPixelBus<NeoRgbFeature, NeoWs2801Spi2MhzMethod>;
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```
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### LED Driver API
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```cpp
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void initStrips();
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void showBothStrips();
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void setAllWand(RgbwColor color);
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void setAllSchrank(RgbColor color);
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RgbwColor applyBrightnessW(RgbwColor c, float factor);
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RgbColor applyBrightnessR(RgbColor c, float factor);
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extern StripWand stripWand; // direct access for animation engine (Plan 03)
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extern StripSchrank stripSchrank;
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```
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### Config Constants (config.h)
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- `LED_COUNT_WAND = 300`, `LED_COUNT_SCHRANK = 160`
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- `BRIGHTNESS_CAP = 0.40f`, `BRIGHTNESS_MAX = 0.60f`
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- `UDP_PORT = 4210`, `ANIM_FPS = 50`
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- FreeRTOS priorities: LED_OUTPUT=3, ANIM_TICK=2, WIFI_RECV=1
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## GPIO Pin Assignments
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| Signal | GPIO | Notes |
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|--------|------|-------|
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| SK6812 RMT data | GPIO3 | RMT channel 0, confirmed safe on SuperMini |
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| WS2801 SPI MOSI | GPIO7 | Hardware SPI; fallback GPIO1 if JTAG conflict |
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| WS2801 SPI CLK | GPIO6 | Hardware SPI; fallback GPIO0 if JTAG conflict |
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**Validation required on hardware** — hardware may require fallback to GPIO0/GPIO1 for WS2801 if JTAG pins conflict.
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## Coexistence Test Status
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**Awaiting hardware checkpoint validation.** The firmware is ready to flash. Developer must:
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1. Fill in `firmware/src/credentials.h` with WiFi credentials
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2. Run `cd firmware && pio run` — must compile without errors
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3. Flash to ESP32-C3 SuperMini via `pio run --target upload`
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4. Confirm serial output: "WIFI_PS_NONE set", IP address, both strips lit
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5. Run 300-packet UDP burst at 10 pps for 30 seconds, observe zero flicker
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## Deviations from Plan
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### Auto-fixed Issues
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None — plan executed exactly as written.
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**Note:** `credentials.h` was correctly excluded from git (per `firmware/.gitignore`) rather than committed with placeholder values. This is the intended behavior — the gitignore entry is working correctly.
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## Commits
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| Task | Commit | Files |
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|------|--------|-------|
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| Task 1: PlatformIO scaffold + config.h | `6fe86bc` | firmware/platformio.ini, firmware/src/config.h |
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| Task 2: LED driver | `55aea7a` | firmware/src/led_driver.h, firmware/src/led_driver.cpp |
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| Task 3: main.cpp + gitignore | `88eb8d3` | firmware/src/main.cpp, firmware/.gitignore |
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## Known Stubs
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None — no UI rendering or placeholder data. All constants are production values per research and context decisions.
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## Self-Check: PASSED
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- `firmware/platformio.ini` exists: FOUND
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- `firmware/src/config.h` exists: FOUND
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- `firmware/src/led_driver.h` exists: FOUND
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- `firmware/src/led_driver.cpp` exists: FOUND
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- `firmware/src/main.cpp` exists: FOUND
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- `firmware/.gitignore` exists: FOUND
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- Commit `6fe86bc` exists: FOUND
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- Commit `55aea7a` exists: FOUND
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- Commit `88eb8d3` exists: FOUND
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