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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
Yeah, sorry about that - I reckon that's your problem. I just checked and the compiler I had trouble with here was a 4.9. I'll update the docs.
I have no idea what the problem is though - obviously it's pretty frustrating. Last time there was a problem like this it was actually some register accesses in ST's USB library that were put out of order (I'm still not convinced it wasn't a compiler bug).