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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
DFU_UPDATE_BUILD=1is for nRF52 - it's basically whether you get a hex file (for SWD upload) or a ZIP (for use with the bootloader).Probably these two should be merged - there's no reason we couldn't do the same tricks we do for nRF52 (to allow building the bootloader first) with STM32