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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
Great! If you can add USART3 to that startup file in a way that won't cause problems for other boards it'd be great to get it in there :)
Yes, you should be able to increase the number of vars. Just make sure that the RAM is in one contiguous block - I know on some F4s it wasn't - so if you wanted to increase vars a lot in that case you'd have to mess with the linker to maybe put the variables in the second block of RAM.