Add UF2 bootloader for USB firmware flashing

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Vendored and trimmed from microsoft/uf2-samdx1, adapted to the actual
ATSAMD21G17D (128 KiB flash / 16 KiB RAM), fixing the flash/RAM-size
mismatch that the previously commented-out SAM-BA bootloader target
had (it assumed a 256 KiB SAMD21G18A). Builds as a standalone
PlatformIO environment (bootloader/platformio.ini), no python2/make
dependency. Compiles clean, fits in the 8 KiB bootloader region
(7292/8192 bytes). Not yet flashed/verified on real hardware.

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This commit is contained in:

cjjohn 2026-08-03 20:56:58 +02:00

parent ce5db617a1

commit de52b57041

143 changed files with 69119 additions and 0 deletions

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bootloader/lib/samd21/samd21a/include/pio/samd21j15a.h Normal file

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