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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
Presumably you haven't set up the ram/rom correctly in the
.pyfile? that would fix your errors.As far as USB - does it actually work on serial? might be worth trying just to make sure.
You'll have to work out what's wrong with USB yourself I'm afraid by comparing it with ST's examples. I think ST may have changed their peripheral slightly from the F407.