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+# gxepd2 capture harness
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+
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+Host-side tooling that **generates a panel descriptor by observing a real
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+GxEPD2 driver run**, instead of hand-writing one. See `claude/DESIGN.md` for
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+the full model; this is the how-to.
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+
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+The vendored GxEPD2 source it compiles against lives in `third_party/GxEPD2/`.
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+Everything here runs on a dev machine with plain `g++` — no ESP toolchain.
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+
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+## Emit a descriptor
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+
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+Each panel has a 4-line `run_<panel>_emit.cpp`. Build and run it (from the
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+`code/` root):
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+
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+```sh
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+VSRC=third_party/GxEPD2/src
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+g++ -std=c++17 -I tools/gxepd2_harness/spy -I $VSRC -I tools/gxepd2_harness \
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+ tools/gxepd2_harness/run_<panel>_emit.cpp \
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+ $VSRC/GxEPD2_EPD.cpp $VSRC/<subdir>/GxEPD2_<Class>.cpp \
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+ -o /tmp/emit_<panel>
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+/tmp/emit_<panel> > /tmp/panel_<panel>.h # candidate descriptor — review it
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+```
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+
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+`emit_descriptor.h` phase-segments the captured command stream into the
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+init / window / refresh sequences + plane-write command(s), reads
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+resolution / busy-polarity / timeout from the driver, and derives
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+`plane_invert` and 1bpp-vs-packed from a fill probe. Review the result, add any
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+packed-format fields the diag passes own (`bits_per_pixel` / `palette` for
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+packed panels; `plane_width` / `row_interleave` for dual-region), then save it
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+as `components/gxepd2/panel_<panel>.h` and wire it into `display.py`'s `MODELS`.
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+
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+`EMIT_DEBUG=1 /tmp/emit_<panel>` dumps the image-stage command/burst structure.
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+
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+## Other programs
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+
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+- `run_<panel>.cpp` + `run_harness.h` — bare-driver capture plus the
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+ window-encoder sweep (`window_sweep.h`), for deriving the coordinate →
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+ window-byte mapping.
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+- `run_<panel>_probe.cpp` + `probe_plane_invert.h` — print the `plane_invert`
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+ probe result on its own.
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+- `run_*diag*.cpp` — the diagnostic-fill passes that derive pixel packing,
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+ palette codes, and row order for packed / multi-region panels.
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+- `spy/` — the host stand-ins for the Arduino/SPI APIs a GxEPD2 driver calls;
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+ `trace.h` records what the driver does.
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