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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
Yes, it should work. Going through the README_* files in GitHub might help.
But basically you just make your own
boards/BOARD.pyfile - and base it in something with a similar chip. IIRC there is already this one: https://github.com/espruino/Espruino/blob/master/boards/OLIMEXINO_STM32_RE.py