This picture is from CubeMX, just a few clicks and I have assigned 6 x UART’s, 3xSPI ports, crystal, SWD + added USB – the IO capabilities on the F405 never stop to amaze me + you gotta love CubeMX. Be a bit on your watch because not every possibility is available through CubeMX. Another tool I like is the 3D Paint version in Windows.

This is for the RS-X Switch.

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