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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.
@Ganehag
Both
USART_WordLength_8bandUSART_WordLength_9bare defined in the header files. ButUSART_WordLength_7bis not. And sinceUSART_WordLength_8bbegins at 0x0 I suspect that the MCU does not support 7bit UART mode.