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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
That's probably going to be a whole other chunk of work I'm afraid. You'll basically be starting from scratch as all of Espruino's USB HID code is STM32 specific.
As I understand it, USB only really became properly supported in 15 (I believe it was pretty flaky before). I did have a build for nRF52840 on SDK14 but USB never worked.
But I could be wrong - you're welcome to give it a try yourself.