Thats a great suggestion, it sounds so obvious now you've said it :) I'll definitely be handling >1 press but that still takes a lot of load off the espruino, if nothing else it'll probably save me some power I would've burned sequentially turning pins on and off.
I'm guessing I'll still want to do some messing around doing the scanning with the low level NRF52 lib to offload that to a peripheral rather than having the core do it. I'll likely still want to do processing on the core while keys are pressed/held to send keycodes with modifiers and things, but if I only have to do that after a pin state change thats great.
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