This is a demonstration of the RP2040's PIO system, which let you run several state machines independently of the CPU. There's exactly 0 overhead and the state machines run a custom assembly language with very few instructions.
This is a demonstration of the RP2040's PIO system, which let you run several state machines independently of the CPU. There's exactly 0 overhead and the state machines run a custom assembly language with simplified instructions.
In this example implementation of a [ring oscillator](https://pub.pages.cba.mit.edu/ring/), pin 1 is configured as a PIO input, and pin 2 as an output. Reading, inverting and writing is as simple as:
