Brian Viele e41ac6ea71 stm32: added peripheral clock get helpers for all stm32 platforms. ...

Allows for abstraction for code that's dependent on knowing the source clock
for a peripheral. Implemented a few core peripherals that tend to have clock
tree differences between platforms (USART, timers, I2C, SPI).

2020-11-28 22:13:25 +00:00

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