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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
USB can be even more tricky I'm afraid - but it's worth a go :)
Not sure where to suggest really - just look in
jshardware.c(and I think there's one to handle interrupts as well?) and see if UART3 is defined and used in all the places that USART1 and 2 are...