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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.
@Mark_wllms
Thanks for that (sorry for the duplicate DM, thought it better to ask in forum). There is some simpler code from Daniel Thompson which might be easier to include. I think the BMA421 needs priming with a binary blob before initialising, which takes more steps.
I'm more nervous about modifying the 'firmware' Espruino build at the moment, because I have no way to recover a bricked device. Rewriting in JS would be time consuming, and also make it harder to keep up with any changes upstream.