.. include:: <mmlalias.txt>


Firmware: Dedicated Thread For "Operator Button" Event
======================================================

.. image:: fsm-operator-button-thread.svg
   :scale: 80%

Plan
----

* Move "operator button" IRQ handling to ``main()`` - much like we
  :doc:`moved "sensor burning <../os-sensor-burning-thread/index>`
* ``FSM`` relieved from "operator button" IRQ artifacts completely
* *Public* method ``FSM::operator_button_pressed()``
* Dedicated semaphore and thread in ``main()``
* FSM completely passive: no IRQ, no timer, no nothing

  * Anybody can call ``timer_tick()``, ``sensor_burning()``,
    ``operator_button_pressed()``
  * |longrightarrow| **YAY UNIT TESTING!!!**

``main()``: "Operator Button" Thread
------------------------------------

.. literalinclude:: code/main.cpp
   :caption: :download:`code/main.cpp`
   :language: c++

FSM: As Small As Possible
-------------------------

.. literalinclude:: code/fsm.h
   :caption: :download:`code/fsm.h`
   :language: c++

.. literalinclude:: code/fsm.cpp
   :caption: :download:`code/fsm.cpp`
   :language: c++