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esp32/esp32_common: Make a board's pins.csv configurable for variants. - #19728
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Allow `mpconfigboard.cmake` or `mpconfigvariant_*.cmake` to specify a
custom `MICROPY_BOARD_PINS` to override `${MICROPY_BOARD_DIR}/pins.csv`.
This lets a single board definition support hardware revisions that have
different pin mappings by using board variants.
This was copied from the existing behavior of the rp2 port.
Signed-off-by: Seon Rozenblum <seon@unexpectedmaker.com>
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Code size report: |
projectgus
self-requested a review
September 30, 2026 00:07
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Wicked, thanks @dpgeorge - now I can PR a stack of new UM board changes that used it! |
UnexpectedMaker
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Oct 5, 2026
Add Series D variants to the Unexpected Maker TinyS3, ProS3, FeatherS3, TinyC6 and TinyPICO boards. Each board now has a standard variant and a D variant that uses its own `pins_d.csv` via `MICROPY_BOARD_PINS` and its own frozen manifest. D variants include a MAX17048 fuel gauge driver and a new `*d.py` helper module, and report a `[D]` board name. The TinyC6[D] also includes an FXL6408 IO expander driver, which is used to switch between the onboard and external antenna. Add the new EdgeS3[D] board, which includes the MAX17048 fuel gauge and FXL6408 IO expander drivers. Also fix the I2C SCL and SDA pins, which were swapped in the TinyS3 and ProS3 `pins.csv`. This requires PR micropython#19728 so that the builds use the correct pins file for each variant: micropython#19728 Signed-off-by: Seon Rozenblum <seon@unexpectedmaker.com>
UnexpectedMaker
added a commit
to UnexpectedMaker/micropython
that referenced
this pull request
Oct 5, 2026
Add Series D variants to the Unexpected Maker TinyS3, ProS3, FeatherS3, TinyC6 and TinyPICO boards. Each board now has a standard variant and a D variant that uses its own `pins_d.csv` via `MICROPY_BOARD_PINS` and its own frozen manifest. D variants include a MAX17048 fuel gauge driver and a new `*d.py` helper module, and report a `[D]` board name. The TinyC6[D] also includes an FXL6408 IO expander driver, which is used to switch between the onboard and external antenna. Add the new EdgeS3[D] board, which includes the MAX17048 fuel gauge and FXL6408 IO expander drivers. Also fix the I2C SCL and SDA pins, which were swapped in the TinyS3 and ProS3 `pins.csv`. This requires PR micropython#19728 so that the builds use the correct pins file for each variant: micropython#19728 Signed-off-by: Seon Rozenblum <seon@unexpectedmaker.com>
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Summary
I have new revisions of most of my ESP32 boards that can run off the same MP builds – but they have some external header and/or internal IO mapping changes, so I needed a way to allow the variant build system to support different pins.csv files.
The rp2 port lets a board override its pins file via
MICROPY_BOARD_PINS(1a060e8), so this change brings the same to the esp32 port, so one board folder can use board variants to support hardware revisions with different pin mappings, instead of duplicating the whole board definition.A board's
mpconfigboard.cmakeormpconfigvariant_*.cmakecan now setMICROPY_BOARD_PINS. If it isn't set, the build uses${MICROPY_BOARD_DIR}/pins.csvas before, so existing boards are unaffected.Testing
Built an esp32c6 board (UM_TINYC6) with two variants on ESP-IDF v5.5.5: one pointing
MICROPY_BOARD_PINSatpins.csv, the other atpins_d.csv, and I flashed both board revisions and checked that each build generatedpins.cfrom the correct CSV.Generative AI
I used generative AI tools when creating this PR, but I found the existing rp2 support, directed the AI to add it to the esp32 port, and then personally checked and verified the change, before making builds.
I also created the variant pin files, flashed the boards and tested them myself.
This PR was generated by me, not my AI.
SeonR