STM32: SPI clock rate fix and cleanup #2307
Merged
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This PR corrects an issue in the STM32 port where an incorrect bus clock was used to calculate frequency on several instances of the SPI peripheral, halving the clock rate. The module now correctly selects a bus clock based on SPI instance. Thanks @dhalbert for finding this!
Since SPI was one of the first modules created for the port, I've also taken the opportunity to clean it up a bit to bring it more in line with the other modules.
resolves #2304