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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
Ok, I just added support to the low-level library. Check out the examples there:
http://www.espruino.com/NRF52LL
While there aren't interrupts there directly you can still hook it up to do some pretty interesting things (eg counting changes in the input or accurately measuring the time between them). If you desperately need them you can always change the state of a pin, then short that to another pin that you can use with
setWatch.