FastLED Platform: nRF51

Nordic nRF51 family support.

Files (quick pass)

• fastled_arm_nrf51.h: Aggregator; includes pin/SPI/clockless.
• fastpin_arm_nrf51.h: Pin helpers.
• fastspi_arm_nrf51.h: SPI backend.
• clockless_arm_nrf51.h: Clockless driver for nRF51.
• led_sysdefs_arm_nrf51.h: System defines for nRF51.

Notes:

• Lower-clock Cortex-M0; carefully budget interrupt windows when using clockless.
• Prefer fewer parallel lanes or shorter strips with clockless to maintain timing margins.

Optional feature defines

• FASTLED_USE_PROGMEM: Default 0.
• FASTLED_ALLOW_INTERRUPTS: Default 1.
• FASTLED_ALL_PINS_HARDWARE_SPI: Enabled by default when not forcing software SPI.

Define before including FastLED.h.