* Generate a core index put into the PAC for the peripherals to use as
index into registers.
* Add EXTI v2 which uses CORE_INDEX to index exti registers
Always search for a enable bit, even when no clock is specified in the
yaml. Try to derive the clock name from the register name.
This change picked up USART2 for stm32wle which was missing the clock.
The number has different meanings depending on family:
stm32f0: RCC_APB2ENR - APB peripheral clock enable register 2 CLOCK: APB1
stm32f4: RCC_APB2ENR - RCC APB2 peripheral clock enable register CLOCK: APB2
Ignore the clock number and search all registers for a matching enable bit.
Includes the addition of a `dbgmcu!(...)` macro table which currently takes
the form of
(cr, $fn_name:ident)
where `$fn_name` is something like `set_dbgsleep_d1` etc.
The method is unsafe, since it's performing unsafe PAC operations.
Two examples modified to demonstrate its usage.
This fix build on F0, since it doesn't have DMARST. This change makes
RccPeripheral::reset a no-op on peripherals where a reset field couldn't
be found
