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timing-analysis

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Analyze real-time constraints, ISR latency, DMA transfer times, and LED protocol timing for embedded systems. Use when debugging timing-sensitive code, optimizing frame rates, or verifying protocol compliance.

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How to use this skill

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Source SKILL.md: https://github.com/FastLED/FastLED/blob/HEAD/.claude/skills/timing-analysis/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

Analyze timing-critical code paths for real-time constraint violations and optimization opportunities.

$ARGUMENTS

What This Skill Analyzes

LED Protocol Timing

  • WS2812/SK6812/APA106 bit timing compliance (T0H, T0L, T1H, T1L, reset)
  • SPI clock rate calculations for wave8 encoding
  • RMT resolution and duration encoding accuracy
  • Reset pulse duration adequacy across chipsets

Frame Rate Analysis

  • Total frame time budget (show() to DMA complete to reset delay)
  • Per-LED encoding time multiplied by LED count = encoding phase duration
  • DMA transfer time at configured clock rate
  • Inter-frame gap and CPU availability

ISR Latency

  • Interrupt response time constraints
  • ISR execution time (must be <10us for most applications)
  • Priority inversion risks from ISR-held resources
  • Nested interrupt handling

DMA Transfer Timing

  • Transfer size multiplied by clock period = transfer duration
  • Double-buffer swap timing and pipeline stalls
  • Chunk encoding overlap with DMA transmission
  • SPI/I2S/RMT peripheral clock configuration

How To Use

/timing-analysis src/platforms/esp/32/drivers/spi/
/timing-analysis What is the maximum frame rate for 300 WS2812 LEDs on ESP32-S3 using SPI?
/timing-analysis Check if the RMT timing meets WS2812 spec

What You'll Get

  • Timing breakdown with calculated durations (ns/us/ms precision)
  • Protocol compliance verification against LED chipset datasheets
  • Frame rate estimates for given LED counts
  • Bottleneck identification and optimization suggestions
  • Clock configuration recommendations