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platform-port

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Guide porting FastLED to new MCU platforms, including int.h types, clockless drivers, SPI implementations, and platform detection. Use when adding support for a new microcontroller family or board.

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Source SKILL.md: https://github.com/FastLED/FastLED/blob/HEAD/.claude/skills/platform-port/SKILL.md

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Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

Guide the process of porting FastLED to a new microcontroller platform.

$ARGUMENTS

What This Skill Covers

Platform Detection Setup

  • Create platform detection headers (is_<platform>.h)
  • Define FL_IS_<PLATFORM> macros following naming convention
  • Wire into existing detection chain (src/platforms/)

Integer Type Definitions

  • Create platform-specific int.h with correct primitive type mappings
  • Register in the src/platforms/int.h dispatcher

LED Output Drivers

  • Clockless (bit-bang) driver implementation
  • SPI hardware driver if platform supports it
  • RMT/I2S/PARLIO drivers for ESP32 variants
  • GPIO register access patterns for the target MCU
  • Peripheral existence check FIRST — before naming any <Peripheral>_Type typedef or <Peripheral>_BASE address, verify the peripheral EXISTS on the target chip against BOTH the vendor CMSIS PAL header for that specific variant AND the chip's datasheet chapter. See agents/docs/peripheral-existence.md for the halt-on-phantom rule and the LPC804 anti-example (framework-arduino-lpc8xx#35).
  • Register-map authoring — use the vendor CMSIS PAL header (LPC845.h, stm32f4xx.h, nrf52840.h, hardware/structs/*.h, etc.); do not hand-roll register shims. See agents/docs/register-maps.md for the rule, the vendor-source table, and the tier-1/2/3 integration pattern.

Build System Integration

  • PlatformIO board definition
  • Meson build configuration
  • Compiler flags and linker scripts

How To Use

/platform-port STM32H7
/platform-port RP2040
/platform-port nRF52840
/platform-port I need to add support for the ESP32-P4

What You'll Get

  • Step-by-step porting checklist with file locations
  • Platform detection header template
  • Integer type mapping research and implementation
  • Clockless driver skeleton based on platform GPIO speed
  • Build system configuration guidance
  • Testing strategy for the new platform