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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Chaz
I did give this a shot but didn't quite get where I wanted to. If there's somebody else who wants to pick up this work, I'd be happy to have a quick chat about what I know so far.
I estimate that a couple of weeks of solid effort will get the port through. I unfortunately do not have that kind of temporal availability at the moment.
The major issue that got me stuck was that while a lot of the Espruino code is modular with respect to ports, much of it isn't, with #ifdefs in many places to put in architecture-specific code. There are also assumptions about what an ARM has and does, and the Pico is a bit different in terms of how their custom C/C++ SDK is structured, and importantly, abstracted.