FastLED Platform: Teensy 3.6 (K66)

Teensy 3.6 (MK66FX1M0) support.

Files (quick pass)

• fastled_arm_k66.h: Aggregator; includes pin/SPI/clockless and reuses some K20 helpers.
• fastpin_arm_k66.h: Pin helpers.
• fastspi_arm_k66.h: SPI output backend.
• clockless_arm_k66.h: Single-lane clockless driver (DWT counter).
• clockless_block_arm_k66.h: Block/multi-lane variant.
• led_sysdefs_arm_k66.h: System defines for K66.

Notes:

• Similar to K20 timing model with higher clocks; observe interrupt thresholds for consistent output.
• DWT cycle counter is used by clockless; ensure it is enabled early for precise timing.

Optional feature defines

• FASTLED_USE_PROGMEM: Default 1 on some Teensy3 cores.
• FASTLED_ALLOW_INTERRUPTS: Default 1. Enables FASTLED_ACCURATE_CLOCK.

Define before including FastLED.h.