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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
It's exactly the same, on all platforms.
However you need to reboot the whole device (!) for it to take effect! https://devzone.nordicsemi.com/question/82143/using-gpio-10-nfc-pin-to-drive-spi-sclk/
Are you actually using a Puck.js and are trying to get the pins working, or are you using a bare nRF52?