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Add end-to-end USB flashing for the app firmware via UF2

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Adds uf2conv.py (minimal, dependency-free .bin -> .uf2 converter
matching bootloader/inc/uf2format.h's block layout) and upload_uf2.py,
a PlatformIO upload hook for env:versapad_usb that finds the mounted
VERSABOOT volume and copies the converted firmware onto it.

env:versapad_usb previously used upload_protocol=sam-ba, the classic
Arduino/Atmel protocol -- the actual bootloader speaks UF2/mass
storage, not SAM-BA, so that upload path never worked. Switched to
upload_protocol=custom with the new hook, and cleaned the now-unused
SAM-BA-specific fields out of boards/versapad.json.

Verified end to end on real hardware: pio run -e versapad_usb
--target upload builds, converts, copies to the VERSABOOT drive, and
the bootloader jumps into the freshly written app on its own.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Julian Appel 2026-08-05 21:35:19 +02:00
parent f60a29137c
commit d325297063
7 changed files with 210 additions and 32 deletions
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7
platformio.ini
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@ -22,8 +22,11 @@ upload_protocol = custom
extra_scripts = upload_openocd.py
debug_tool = openocd
; ── USB SAM-BA (nur wenn Bootloader geflasht ist) ─────────────────────────────
; ── USB UF2 (nur wenn bootloader/ geflasht ist) ────────────────────────────────
; Der eigene Bootloader spricht UF2/Massenspeicher, kein SAM-BA. upload_uf2.py
; erzeugt aus firmware.bin ein .uf2 und kopiert es aufs VERSABOOT-Laufwerk.
[env:versapad_usb]
extends = common
board = versapad
upload_protocol = sam-ba
upload_protocol = custom
extra_scripts = upload_uf2.py