Hi Will,
I'll be happy to throw my opinions in on the PLL or clock changes at the
BSP level.
This also touches on some important issues with power management if you
start thinking about an API around that (which is critical to anything
IoT of course). Often, just before going into sleep modes you want to
configure the clock(s) with a specific setup, and then when you wakeup
move them back to a previous configuration. That's beyond the scope of
the core clock setup at the BSP level, but you'll still probably want to
have clock configuration as part of the overall HAL for both reasons.
I agree it's non trivial, though, since every microcontroller or SoC
will have it's own clock configuration values and parameters. It may end
up making more sense to provide a 'weak' clock setup function(s) that
can be easily overridden, with a sensible defaults at the mcu level, and
document the enum values for each MCU?
K.
