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+---
+phase: "07"
+plan: "03"
+subsystem: firmware
+tags: [firmware, micropython, frame-mode, drgb, drgbw, dnrgb, udp]
+dependency_graph:
+  requires: [07-01, 07-02]
+  provides: [firmware/protocol.py#FrameAssembler, firmware/main.py#frame-mode]
+  affects: [lightsync/protocol/drgb.py]
+tech_stack:
+  added: []
+  patterns: [DNRGB multi-packet reassembly, frame timeout with animation fallback]
+key_files:
+  created: [tests/test_firmware_frames.py]
+  modified: [firmware/protocol.py, firmware/main.py]
+decisions:
+  - "Frame timeout (2s) reverts to last animation, not idle — matches WLED behavior"
+  - "frame_is_rgbw flag routes DRGB/DNRGB to write_rgb, DRGBW to write_rgbw"
+  - "FrameAssembler keyed by absolute pixel index (start_index + i) — tolerates out-of-order chunks"
+metrics:
+  duration: "2 minutes"
+  completed: "2026-04-07"
+  tasks_completed: 3
+  files_changed: 3
+---
+
+# Phase 7 Plan 3: Frame Mode Renderer Summary
+
+**One-liner:** DRGB/DRGBW/DNRGB raw frame handling with FrameAssembler multi-packet reassembly and 2s animation fallback timeout.
+
+## What Was Built
+
+Added raw frame mode to the firmware. The device now receives pixel data from the server and writes it directly to the LED strip, supporting three packet types:
+
+- **DRGB** (0x02): 3 bytes/pixel RGB, up to 490 pixels per packet — routed to `strip.write_rgb()`
+- **DRGBW** (0x03): 4 bytes/pixel RGBW, up to 367 pixels per packet — routed to `strip.write_rgbw()`
+- **DNRGB** (0x04): chunked RGB with start_index for large strips — reassembled by `FrameAssembler`, then routed to `strip.write_rgb()`
+
+Frame mode takes priority over animation mode. When no frame packet arrives for 2 seconds, the firmware reverts to the last animation command.
+
+## Tasks Completed
+
+| Task | Description | Commit | Files |
+|------|-------------|--------|-------|
+| 1 | Add FrameAssembler to firmware/protocol.py | d14fa3c | firmware/protocol.py |
+| 2 | Replace firmware/main.py with frame mode version | 2a22eef | firmware/main.py |
+| 3 | Create tests/test_firmware_frames.py (19 tests) | ec97600 | tests/test_firmware_frames.py |
+
+## Verification
+
+- [x] `uv run pytest tests/test_firmware_frames.py -v` — 19 passed in 0.11s
+- [x] `firmware/protocol.py` contains `FrameAssembler` with `feed()`, `reset()`, 200ms timeout
+- [x] `firmware/main.py` handles DRGB (write_rgb), DRGBW (write_rgbw), DNRGB (via FrameAssembler)
+- [x] Frame timeout (2s) reverts to last animation command mode
+- [x] DNRGB 600-LED multi-packet frame: 2 packets (489 + 111 LEDs) round-trip passes
+- [x] 300-LED DRGB = 902 bytes, DRGBW = 1202 bytes — both fit in single UDP packet
+- [x] FrameAssembler clears stale partial frames after 200ms timeout
+
+## Deviations from Plan
+
+None — plan executed exactly as written.
+
+## Known Stubs
+
+None — all frame handling is fully wired.
+
+## Self-Check: PASSED
+
+- firmware/protocol.py exists with FrameAssembler: FOUND
+- firmware/main.py exists with frame mode: FOUND
+- tests/test_firmware_frames.py exists: FOUND
+- Commits d14fa3c, 2a22eef, ec97600: FOUND