FT: EVSYS peripheral implementation and pulse counting #839
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Summary
This PR is a Work in progress!
This adds a basic channel based implementation for the EVSYS peripheral found on SAMx controllers. Along with a new PulseCounter struct that utilizes the EVSYS, TC and EIC peripheral to count pulses on an EIC channel without any CPU intervention. I had created this in order to monitor hall effect speed sensors.
A huge benefit here is that you can use any TC to monitor any EIC Extint with this method, so the monitored pins do not have to actually be connected to a TC peripheral, making it a lot more flexible.
Apologies for some overlap with #837, as that was needed to get EIC working, but I think this PR should be aimed at reviewing the EVSYS implementation and PulseCounter.
There is still a fair bit more to add to the evsys system (Automatic path type configuration, multiple channels from 1 generator, ...)
Future plans with this