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A open source, open hardware up-to-16x USB-MIDI-interface for around 15 bucks in its smallest configuration.
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Currently, only a proof-of-concept software UART.
Flashing: Connect RX/TX of your uart/usb-adapter to PA9/PA8.
PA0/PB0 is the first software UART running at 31250 baud, while PA9/PA8 is the hardware uart running at 38400 baud used for flashing and debug messages.
Connect your MIDI opto-coupler to PB0 and watch the output on PA9/8.