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Changelog

0.1.0 — 2026-05-12

Initial fork from Adafruit_nRF52_Arduino, reworked for Nordic nRF54L05/L10/L15 with s145 SoftDevice 9.0.0. PlatformIO-only consumption via caveman99/platform-nordicnrf54.

Highlights:

  • nRF54L MDK headers, s145 9.0.0 SoftDevice API and SoftDevice hex
  • Linker scripts for L05/L10/L15 reserving 28 KB for InternalFS
  • FreeRTOS port running off the GRTC peripheral (nRF54L has no SysTick)
  • nrf54l_compat.h aliasing nRF52 peripheral names to nRF54L equivalents so most Adafruit core code compiles unmodified
  • wiring_analog_nRF54L.c — fresh SAADC implementation accounting for nRF54L's 0.9 V internal reference, multiplier gain enum, microsecond TACQ and byte-count MAXCNT
  • InternalFileSystem and flash_nrf5x.c consume __flash_arduino_start / __bootloader_addr linker symbols (no per-chip ifdefs in code)
  • Bluefruit54Lib: HID detached from TinyUSB; data-length update reply capped by configured BANDWIDTH
  • Five board variants: xiao_nrf54l15, xiao_nrf54l15_sense, nrf54l15dk, nrf54l10dk, nrf54l05dk
  • XIAO variants route Wire to TWIM22 (dedicated TWI controller), avoiding the SERIAL00/SERIAL20 fabric shared with SPI/UARTE
  • nRF52-only submodules (Adafruit_TinyUSB_Arduino, Adafruit_nRFCrypto) removed — nRF54L has no USB and uses CRACEN instead of CC310
  • Bootloader hex sourced from the separate nRF54_Bootloader PlatformIO package (this repo ships only the SoftDevice hex)