Embedded & hardware
Self-tuning Si5351
Self-calibrating multi-output clock generator.
Si5351A driver and web control surface for the ESP32-P4-Nano, with hardware frequency counting on the PCNT peripheral, three-phase auto-calibration to ~1 ppm, and a background PI controller that compensates crystal thermal drift over hours.
Specifications
- 32.768 kHz – 160 MHz on 3 outputs, integer-optimised PLL/MS
- PCNT-based frequency counter (no glitch filter, 40+ MHz, 10 Hz updates)
- Three-phase auto-cal: coarse → fine → ±500 Hz binary search
- PI drift compensator with 10 s loop, 5 ppm dead zone, IIR smoothing
- Dark web UI: presets, live counter, ppm graph, register dump, I2C scanner
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