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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.
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@dwallersv
Serial1.setup(115200); // notice: Serial1 (Serial # One)
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A9/A10 - USART1 (USART - Universal Synchronous/Asynchronous Receiver/Transmitter # 1) IS Serial1 - as per HW reference for HYSTM32_32.