I've been working on prototypes that involve me making PCB's and using Arduino/c as the software that runs my applications.
You can find the schematics listed on the Pico page: https://www.espruino.com/Pico#information
Also, the F4 chips have a USB bootloader, so it's not a big deal to write the firmware on to them: https://www.espruino.com/Pico#advanced-reflashing
(Also, I'm moving this into the 'porting to new devices' section)
It's not horrible, but I can't really help you out much more than what's above - if it was massively easy to do then nobody would bother buying Espruino boards :)
Thanks for getting back to me on this Gordon :) I'll give this a try!
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