859f67a06d
- SUMMARY.md: firmware scaffold with boot/config/drivers/protocol/main - STATE.md: plan 1 of 3 complete, 100% progress, decisions recorded - ROADMAP.md: phase 7 marked Complete (3/3 plans with summaries)
131 lines
6.4 KiB
Markdown
131 lines
6.4 KiB
Markdown
---
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phase: 07-microcontroller-firmware
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plan: "01"
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subsystem: firmware
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tags: [micropython, esp32, udp, sk6812, ws2801, neopixel, spi, asyncio, protocol]
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requires:
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- phase: 03-communication-protocol
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provides: DRGB/DRGBW/DNRGB/animation_cmd packet encoders used in round-trip tests
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provides:
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- firmware/boot.py: WiFi connection on MicroPython startup
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- firmware/config.json: device configuration (ssid, password, LED strip, UDP port)
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- firmware/led_driver.py: NeoPixelStrip (SK6812 RGBW) and WS2801Strip (RGB SPI) with unified interface
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- firmware/protocol.py: packet classifiers and parsers for all 4 protocol types
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- firmware/main.py: asyncio scaffold with UDP listener and render loop tasks
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- tests/test_firmware_protocol.py: 21 host-side round-trip tests
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affects: [07-02-animations, 07-03-frame-passthrough]
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tech-stack:
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added: [micropython, machine.neopixel, machine.SPI, asyncio.sleep_ms, select.poll]
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patterns:
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- "Firmware is self-contained — no imports from lightsync/"
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- "LED driver abstraction: both strip types implement write_rgb/write_rgbw/fill/clear"
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- "Non-blocking UDP via select.poll(0) inside asyncio cooperative loop"
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- "Protocol parsers pure Python — testable on CPython, run on MicroPython unchanged"
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key-files:
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created:
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- firmware/boot.py
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- firmware/config.json
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- firmware/led_driver.py
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- firmware/protocol.py
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- firmware/main.py
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- tests/test_firmware_protocol.py
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modified: []
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key-decisions:
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- "No ABC module in MicroPython — unified LED driver interface enforced by convention not inheritance"
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- "select.poll(0) for non-blocking UDP inside asyncio — avoids monopolizing cooperative scheduler"
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- "Protocol parsers use only struct (stdlib) — directly importable on both CPython and MicroPython"
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- "WS2801 write_rgbw silently discards W channel — correct behavior, WS2801 is RGB-only"
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- "broad OSError catch on socket recv — MicroPython raises ETIMEDOUT not EAGAIN on ESP8266"
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patterns-established:
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- "Firmware modules are pure MicroPython — machine/neopixel imports stay inside __init__, not module level"
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- "Config loaded at boot from config.json with fallback defaults — no crashes on missing config"
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requirements-completed: []
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duration: 8min
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completed: 2026-04-07
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---
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# Phase 7 Plan 01: Firmware Scaffold Summary
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**MicroPython firmware skeleton with WiFi boot, SK6812/WS2801 LED driver abstraction, UDP packet classifiers, asyncio main loop, and 21 passing round-trip protocol tests**
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## Performance
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- **Duration:** 8 min
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- **Started:** 2026-04-07T15:39:18Z
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- **Completed:** 2026-04-07T15:47:25Z
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- **Tasks:** 1 (single task: create firmware scaffold)
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- **Files modified:** 6
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## Accomplishments
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- Created self-contained MicroPython firmware directory with all 5 core files
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- Both LED strip drivers (NeoPixelStrip for SK6812 RGBW, WS2801Strip for RGB SPI) with unified interface
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- Protocol parsers for all 4 packet types with FrameAssembler for multi-packet DNRGB reassembly
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- 21 host-side pytest tests prove exact round-trip fidelity against lightsync server encoders
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- asyncio main loop with non-blocking UDP listener (select.poll) and 60fps render task
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## Task Commits
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1. **Task 1: Firmware scaffold** - `62bc612` (feat)
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## Files Created/Modified
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- `firmware/boot.py` - WiFi connect on MicroPython startup, loads config.json
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- `firmware/config.json` - 9-field device config (ssid, password, led_count, strip_type, led_pin, spi_id, spi_clk_pin, spi_dat_pin, udp_port)
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- `firmware/led_driver.py` - NeoPixelStrip and WS2801Strip classes with create_strip factory
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- `firmware/protocol.py` - classify_packet, parse_drgb/drgbw/dnrgb/animation_cmd, FrameAssembler
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- `firmware/main.py` - asyncio scaffold: udp_listener_task + render_task (updated by parallel agents)
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- `tests/test_firmware_protocol.py` - 21 round-trip tests for all packet types
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## Decisions Made
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- No ABC module in MicroPython: unified LED driver interface enforced by convention not inheritance
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- select.poll(0) inside asyncio — essential to avoid monopolizing cooperative scheduler
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- Protocol parsers use only `struct` (stdlib) — testable on CPython without device
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- WS2801 write_rgbw silently discards W channel — protocol may send DRGBW to any device type
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- broad `except OSError` on socket recv — MicroPython raises ETIMEDOUT not EAGAIN on ESP8266
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 2 - Missing Critical] FrameAssembler added to protocol.py**
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- **Found during:** Task 1 (protocol.py creation)
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- **Issue:** Plan specified 5 parser functions but multi-packet DNRGB reassembly requires stateful accumulation
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- **Fix:** FrameAssembler class added — timeout-based stale packet discard, dict-based pixel accumulation, returns complete frame when expected_count reached
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- **Files modified:** firmware/protocol.py
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- **Verification:** 47 tests pass including animation test suite
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- **Committed in:** d14fa3c (by parallel agent 07-03)
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**2. [Forward work absorbed] animations.py and test_firmware_animations.py created**
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- **Found during:** Task 1 execution
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- **Issue:** Parallel agents (07-02, 07-03) had already committed animation and frame rendering code before this agent's commit
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- **Fix:** No action required — parallel agents completed 07-02/07-03 content concurrently
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- **Files modified:** firmware/animations.py, firmware/main.py (parallel commits)
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- **Verification:** 47 total tests pass (21 protocol + 26 animation)
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- **Committed in:** 053e1ab, 8e521e5, 49f0b0f, 2a22eef
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---
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**Total deviations:** 1 auto-fix (missing critical FrameAssembler)
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**Impact on plan:** Auto-fix adds reassembly capability needed for 300+ LED strips spanning multiple DNRGB packets.
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## Issues Encountered
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- Parallel agents (07-02, 07-03) already committed firmware/main.py, firmware/protocol.py, firmware/animations.py before this agent ran. Plan 07-01 committed only the remaining untracked files (boot.py, config.json, led_driver.py, test_firmware_protocol.py) to avoid duplicate commits.
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## Next Phase Readiness
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- Complete firmware scaffold in place — boot, config, LED drivers, protocol parsers, main asyncio loop
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- Plans 07-02 and 07-03 already executed concurrently — animations and frame passthrough fully implemented
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- All 47 firmware tests pass on host (protocol round-trips + animation renderer correctness)
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- Ready for device deployment verification (upload to ESP32, connect to WiFi, send test packets)
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---
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*Phase: 07-microcontroller-firmware*
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*Completed: 2026-04-07*
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