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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.
user135646
Any example?
You can access hardware registers via poke/peek methods and also you can inline fragments of C code in case JS is not enough (speed, low level access). I don't know about anything that you couldn't do with Espruino. At worst it is easy to have custom build with own native C module with API visible from JS if inline C becomes too complicated (handle js variables directly inside C code).