.. include:: <mmlalias.txt>


Firmware: Dedicated Thread For Timer Tick
=========================================

.. image:: fsm-timer-tick-thread.svg
   :scale: 80%

Plan
----

* Currently, FSM is responsible for generating its own events

  * Timer tick
  * Sensor burning
  * Operator button

* Starting with timer tick: pull these out into ``main()``

  * Semaphore
  * Periodic timer into ``main()`` |longrightarrow| *give* semaphore
  * Timer tick thread into main |longrightarrow| *take* semaphore
    (waiting for timer), and call *public* ``FSM::timer_tick()``

* *Ultimate goal:* remove ``FSM::start()`` and make FSM completely
  *passive*
* |longrightarrow| Talk about testability

``main()``: Timer, And Timer Tick Thread
----------------------------------------

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

FSM: Much Smaller
-----------------

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

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