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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
On the VL board you're communicating via Serial1 on pins A9/A10 to get a Serial console. Is it possible that when you call
Serial1.setup(9600,{rx:B7,tx:B6});you're just moving the serial port to another place, which means you no longer get a response?What if you type
setInterval("LED.toggle",500)beforehand - so an LED will flash on and off. Does it keep flashing after you issue the command?