:mod:`countio`
==============

.. py:module:: countio

.. autoapi-nested-parse::

   Support for edge counting

   The `countio` module contains logic to read and count edge transistions

   .. warning:: This module is not available in some SAMD21 (aka M0) builds. See the
     :ref:`module-support-matrix` for more info.

   All classes change hardware state and should be deinitialized when they
   are no longer needed if the program continues after use. To do so, either
   call :py:meth:`!deinit` or use a context manager. See
   :ref:`lifetime-and-contextmanagers` for more info.



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.. py:class:: Counter(pin_a: microcontroller.Pin)

   Counter will keep track of the number of falling edge transistions (pulses) on a
   given pin

   Create a Counter object associated with the given pin. It tracks the number of
   falling pulses relative when the object is constructed.

   :param ~microcontroller.Pin pin_a: Pin to read pulses from.


   For example::

       import board
       import countio

       pin_counter = countio.Counter(board.D1)
       #reset the count after 100 counts
       while True:
           if pin_counter.count == 100:
               pin_counter.reset()
           print(pin_counter.count)

   .. py:attribute:: count
      :annotation: :int

      The current count in terms of pulses.


   .. py:method:: deinit() -> None

      Deinitializes the Counter and releases any hardware resources for reuse.


   .. py:method:: __enter__() -> Counter

      No-op used by Context Managers.


   .. py:method:: __exit__() -> None

      Automatically deinitializes the hardware when exiting a context. See
      :ref:`lifetime-and-contextmanagers` for more info.


   .. py:method:: reset() -> None

      Resets the count back to 0.