Implement new PCNT API

[Luro02]

Motivations

• Would you like to implement this feature? Y

Counting the number of pulses is useful. In my case, I want to use it to keep track of how many step pulses I sent to the stepper motor driver. This requires using the same pin as both an output and input (but that would be another issue).

Solution

Implement the new API.

Alternatives

Additional context