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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.
@FyberChris
I can confirm USB-TTL isn't working. It works fine on the F4. The F401C has the same USB conflict pins, so it needs serial on USART2 too. I assume there is something wrong with my CSV file.