Karl Palsson 5746fd4d25 stm32: common: Extract MCO source setting
This adds MCO source selection to some targets, and removes and standardizes
the mask/shift usage for all targets.  For devices that support MCO2, this
supports only MCO1.  No attempt has been made to extract MCO prescaler, which
is not available on all F1 and F3.
2015-04-29 01:22:27 +00:00
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