I'm delving in to the world of STM32 micros, so I ported the Arduino Pixxi Serial library over to the HAL STM32 library. My new Pixxi 39P4 runs great on a Nucleo evaluation board although I haven't tested all of the functions yet, and there were some timing issues with commands that require a response, but basic stuff seems to work fine.
The library is up on GitHub, I hope 4D Systems don't mind my blatant plagiarism.

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Hopefully have some more projects to report soon.