This tool is a simulator that allows you to execute and verify the programmable I/O (PIO) assembly code for the RP2040 ( found in the Raspberry Pi Pico) and the RP2350 (found in the Raspberry Pi Pico 2) directly in a web browser. No installation is required, and you can immediately check the behavior of the state machine within the opened page.

https://ice458.github.io/tools/pio_sim/index.html