led2/.planning/phases/07-microcontroller-firmware/07-01-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
07-microcontroller-firmware	01	firmware	micropython esp32 udp sk6812 ws2801 neopixel spi asyncio protocol	phase provides 03-communication-protocol DRGB/DRGBW/DNRGB/animation_cmd packet encoders used in round-trip tests	firmware/boot.py WiFi connection on MicroPython startup firmware/config.json device configuration (ssid, password, LED strip, UDP port) firmware/led_driver.py NeoPixelStrip (SK6812 RGBW) and WS2801Strip (RGB SPI) with unified interface firmware/protocol.py packet classifiers and parsers for all 4 protocol types firmware/main.py asyncio scaffold with UDP listener and render loop tasks tests/test_firmware_protocol.py 21 host-side round-trip tests	07-02-animations 07-03-frame-passthrough	added patterns micropython machine.neopixel machine.SPI asyncio.sleep_ms select.poll Firmware is self-contained — no imports from lightsync/ LED driver abstraction: both strip types implement write_rgb/write_rgbw/fill/clear Non-blocking UDP via select.poll(0) inside asyncio cooperative loop Protocol parsers pure Python — testable on CPython, run on MicroPython unchanged	created modified firmware/boot.py firmware/config.json firmware/led_driver.py firmware/protocol.py firmware/main.py tests/test_firmware_protocol.py	No ABC module in MicroPython — unified LED driver interface enforced by convention not inheritance select.poll(0) for non-blocking UDP inside asyncio — avoids monopolizing cooperative scheduler Protocol parsers use only struct (stdlib) — directly importable on both CPython and MicroPython WS2801 write_rgbw silently discards W channel — correct behavior, WS2801 is RGB-only broad OSError catch on socket recv — MicroPython raises ETIMEDOUT not EAGAIN on ESP8266	Firmware modules are pure MicroPython — machine/neopixel imports stay inside __init__, not module level Config loaded at boot from config.json with fallback defaults — no crashes on missing config		8min	2026-04-07

Phase 7 Plan 01: Firmware Scaffold Summary

MicroPython firmware skeleton with WiFi boot, SK6812/WS2801 LED driver abstraction, UDP packet classifiers, asyncio main loop, and 21 passing round-trip protocol tests

Performance

• Duration: 8 min
• Started: 2026-04-07T15:39:18Z
• Completed: 2026-04-07T15:47:25Z
• Tasks: 1 (single task: create firmware scaffold)
• Files modified: 6

Accomplishments

• Created self-contained MicroPython firmware directory with all 5 core files
• Both LED strip drivers (NeoPixelStrip for SK6812 RGBW, WS2801Strip for RGB SPI) with unified interface
• Protocol parsers for all 4 packet types with FrameAssembler for multi-packet DNRGB reassembly
• 21 host-side pytest tests prove exact round-trip fidelity against lightsync server encoders
• asyncio main loop with non-blocking UDP listener (select.poll) and 60fps render task

Task Commits

1. Task 1: Firmware scaffold - 62bc612 (feat)

Files Created/Modified

• firmware/boot.py - WiFi connect on MicroPython startup, loads config.json
• 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)
• firmware/led_driver.py - NeoPixelStrip and WS2801Strip classes with create_strip factory
• firmware/protocol.py - classify_packet, parse_drgb/drgbw/dnrgb/animation_cmd, FrameAssembler
• firmware/main.py - asyncio scaffold: udp_listener_task + render_task (updated by parallel agents)
• tests/test_firmware_protocol.py - 21 round-trip tests for all packet types

Decisions Made

• No ABC module in MicroPython: unified LED driver interface enforced by convention not inheritance
• select.poll(0) inside asyncio — essential to avoid monopolizing cooperative scheduler
• Protocol parsers use only struct (stdlib) — testable on CPython without device
• WS2801 write_rgbw silently discards W channel — protocol may send DRGBW to any device type
• broad except OSError on socket recv — MicroPython raises ETIMEDOUT not EAGAIN on ESP8266

Deviations from Plan

Auto-fixed Issues

1. [Rule 2 - Missing Critical] FrameAssembler added to protocol.py

• Found during: Task 1 (protocol.py creation)
• Issue: Plan specified 5 parser functions but multi-packet DNRGB reassembly requires stateful accumulation
• Fix: FrameAssembler class added — timeout-based stale packet discard, dict-based pixel accumulation, returns complete frame when expected_count reached
• Files modified: firmware/protocol.py
• Verification: 47 tests pass including animation test suite
• Committed in: d14fa3c (by parallel agent 07-03)

2. [Forward work absorbed] animations.py and test_firmware_animations.py created

• Found during: Task 1 execution
• Issue: Parallel agents (07-02, 07-03) had already committed animation and frame rendering code before this agent's commit
• Fix: No action required — parallel agents completed 07-02/07-03 content concurrently
• Files modified: firmware/animations.py, firmware/main.py (parallel commits)
• Verification: 47 total tests pass (21 protocol + 26 animation)
• Committed in: 053e1ab, 8e521e5, 49f0b0f, 2a22eef

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Total deviations: 1 auto-fix (missing critical FrameAssembler) Impact on plan: Auto-fix adds reassembly capability needed for 300+ LED strips spanning multiple DNRGB packets.

Issues Encountered

• 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.

Next Phase Readiness

• Complete firmware scaffold in place — boot, config, LED drivers, protocol parsers, main asyncio loop
• Plans 07-02 and 07-03 already executed concurrently — animations and frame passthrough fully implemented
• All 47 firmware tests pass on host (protocol round-trips + animation renderer correctness)
• Ready for device deployment verification (upload to ESP32, connect to WiFi, send test packets)

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Phase: 07-microcontroller-firmware Completed: 2026-04-07