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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.
@rigrig
I think the documentation is lagging behind a bit, but the polyfill from the bootloader should clarify some things.
"clock" is not a callback, it is the mode. For "clock" mode it simply loads the launcher when BTN2 is pressed, so there is no need to pass a callback.