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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
Just to add, the words I use for sleep are a bit misleading...
setDeepSleep(0)the STM32 goes into SLEEP mode (via__WFI) when it's not doing anything - all peripherals are still powered on.setDeepSleep(1)the STM32 goes into STOP mode when it's not doing anything - the high speed oscillator is off, as are most peripherals. It would be the default, but having it on means USARTs/etc won't work.