IO Expander - C libraries?

I don’t see any C Libraries for the IO expander board - only for Python.
Are they around, or do they not exist? Whyever not?

This maybe?
pimoroni-pico/libraries/breakout_ioexpander at main · pimoroni/pimoroni-pico (

There’s also Chris’s port of the Python drivers if you’re wanting to use Arduino rather than Pico flavoured C: GitHub - ZodiusInfuser/IOExpander_Library: An Arduino port of the Python library for the Nuvoton MS51 Pimoroni IO Expander Breakout

Thanks guys. @alphanumeric, I don’t know how I missed that.

Next, I need the module ‘ioexpander’ [and any dependencies] for micropython (RP2040). I’m guessing it’s embedded in the Pimoroni firmware.uf2, but I cannot use that as I need a different firmware for my board.