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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
It should work - but the Web IDE probably defaults to 9600 baud connection speed. I'll put that on my ToDo list, but for now you could use a different terminal app.
No, I'm afraid not. You'd have to implement your own. There's some code in Espruino in place to handle it, but it's not fully implemented yet.
The 'normal' update requires USB, but you can use ST's own internal bootloader for serial: http://www.espruino.com/Serial+Bootloader