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  • This will probably help? https://github.com/espruino/Espruino/blo­b/master/README_BuildProcess.md

    I guess it's possible that some of the serial stuff in jshardware.c just isn't defined for USART3? Not sure. What I'd suggest is to use A2/A3 then see if you can use Serial3.setup and Serial3.write/.on('data',...) from JS to try and get USART3 working - it might give you some human-readable errors that would help :)

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