Just a note to add that support for the STM32F303CBT6 MCU as used in the latest prototype has now beed added to platformIO
I’ve added a platformio.ini file to the repo:
All that’s needed to compile and upload and view serial is
$ git clone https://github.com/openenergymonitor/STM32
$ cd Emon3CT_CB
$ pio run -t upload
$ pio device monitor
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