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@Gordon
@user53771 yes, you're right - the F103 can only get the SPI clock right to +/- 50%.
You should be able to change the clock using
peek32andpoke32functions, but USB on the F103 is really picky, so you probably wouldn't be able to keep that going.It looks like USART would be fine though - just set it up again with
Serial1.setupand it'll use the updated clock speeds. You may find thatgetTime()behaves strangely afterwards though - it depends which board you're using.As you say the other option is to do it at compile time. I'm not sure that changing the clock speed in the
.pyfile will be good enough - you may also need to change this file. But after that it should work.