FastLED Platform: nRF52

Nordic nRF52 family support.

Files (quick pass)

• fastled_arm_nrf52.h: Aggregator; includes pin/SPI/clockless and sysdefs.
• fastpin_arm_nrf52.h, fastpin_arm_nrf52_variants.h: Pin helpers/variants.
• fastspi_arm_nrf52.h: SPI backend.
• clockless_arm_nrf52.h: Clockless driver.
• arbiter_nrf52.h: PWM arbitration utility (selects/guards PWM instances for drivers).
• led_sysdefs_arm_nrf52.h: System defines for nRF52.

Notes:

• Requires CLOCKLESS_FREQUENCY definition in many setups; PWM resources may be shared and must be arbitrated.
• arbiter_nrf52.h exposes a small API to acquire/release PWM instances safely across users; ensure ISR handlers are lightweight.

Optional feature defines

• FASTLED_USE_PROGMEM: Default 0 (flat memory model).
• FASTLED_ALLOW_INTERRUPTS: Default 1.
• FASTLED_ALL_PINS_HARDWARE_SPI: Enabled by default unless forcing software SPI.
• FASTLED_NRF52_SPIM: Select SPIM instance (e.g., NRF_SPIM0).
• FASTLED_NRF52_ENABLE_PWM_INSTANCE0: Enable PWM instance used by clockless.
• FASTLED_NRF52_NEVER_INLINE: Controls inlining attribute via FASTLED_NRF52_INLINE_ATTRIBUTE.
• FASTLED_NRF52_MAXIMUM_PIXELS_PER_STRING: Limit pixels per string in PWM-encoded path (default 144).
• FASTLED_NRF52_PWM_ID: Select PWM instance index used.
• FASTLED_NRF52_SUPPRESS_UNTESTED_BOARD_WARNING: Suppress pin-map warnings for unverified boards.

Define before including FastLED.h.

References

• Adafruit thread-safe malloc issue: https://github.com/adafruit/Adafruit_nRF52_Arduino/issues/35
• Platform.txt with --wrap flags: https://github.com/adafruit/Adafruit_nRF52_Arduino/blob/master/platform.txt
• GCC --wrap documentation: https://sourceware.org/binutils/docs/ld/Options.html