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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
No, I'm afraid not. However given that register is 0 on boot, you could just use one bit of it to store 'I've already run', to figure out if you're running after a BTN3 reboot or not?