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FastLED Platform: Teensy 3.x (K20)

Teensy 3.0/3.1/3.2 support (MK20DX family).

Files (quick pass)

  • fastled_arm_k20.h: Aggregator; includes pin/SPI/clockless and helper controllers.
  • fastpin_arm_k20.h: Pin helpers.
  • fastspi_arm_k20.h: SPI output backend.
  • clockless_arm_k20.h: Single-lane clockless driver using DWT cycle counter.
  • clockless_block_arm_k20.h: Block/multi-lane variant.
  • octows2811_controller.h: OctoWS2811 parallel output integration.
  • ws2812serial_controller.h: UART-style serial WS2812 controller.
  • smartmatrix_t3.h: SmartMatrix support for Teensy 3.x.
  • led_sysdefs_arm_k20.h: System defines for Teensy 3.x.

Notes:

  • DWT cycle counter is used for precise timing; interrupt windows are checked to punt frames when overrun.
  • Consider FASTLED_ALLOW_INTERRUPTS=1 for responsiveness; long ISRs risk jitter and retries.

Optional feature defines

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

Place defines before including FastLED.h.