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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.
@Gordon
Mainly it's just a matter of getting it working with ST's slightly different API (they change it slightly for every model to keep you on your toes). The L1 version of the libs is in the repo already, but personally I haven't built for any of the l series yet.
The real gotcha would be the USB if you care about that. Usually it's a total pain to get working.