* fast exti
* test code snuck in
* full interrupt disable :(
* do it the old fashioned way
* enable interrupt
* consume stored timestamp
* dead
* h7 maybe
* guard maybe
* non-stm32
* exti 16 wrong on f4/f7
* CORTEX_MAXIMUM_PRIORITY
* safer but uglier
* s
* chibios
* no const
* initializers
Co-authored-by: Matthew Kennedy <makenne@microsoft.com>