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https://github.com/fizista/micropython-mcron


https://github.com/fizista/micropython-mcron

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README 

        
.. role:: bash(code)

   :language: bash



.. role:: python(code)

   :language: python



***************************

MicroCRON for MicroPython

***************************



MicroCRON is a time-based task scheduling program.



The library was designed after the experience with its larger predecessor SimpleCRON_. The current library focuses

on minimalism of code while keeping maximum functionality. It takes 3 times less memory than SimpleCRON_.

It needs about 3kB of memory to work.



The software was tested under micropython 1.12 (esp32, esp8266).



What you can do with this library:

##################################



* Run any task at precisely defined intervals

* Delete and add tasks while the program is running.

* Run the task a certain number of times and many more.



Library working principle:

##########################



Generally, the working principle is, in a pseudo-code:



.. code-block::



    insert(action_period, action_pointers, 'minute_5s', callback)



    while (the hardware timer is running):

        current_action_period_pointer = current_time % action_period

        if current_action_period_pointer in action_pointers:

            run callback



We have almost complete freedom to choose the action_period as long as it is greater than zero.



The action_pointers variable should contain data of "set" or "range" type.



When we want to use irregular points in time we use "set". Otherwise, you can use "range". This gives us minimal

memory overhead and at the same time a lot of freedom in defining when actions are to start.



Requirements:

#############



* The board on which the micropython is installed(v1.12)

* The board must have support for hardware timers.



Install

#######

You can install using the upip:



.. code-block:: python



    import upip

    upip.install("micropython-mcron")



or



.. code-block:: bash



    micropython -m upip install -p modules micropython-mcron



You can clone this repository, and install it manually:



.. code-block:: bash



    git clone https://github.com/fizista/micropython-mcron.git

    cd ./micropython-mcron



Simple examples

###############



Simple code run every 5 seconds:



.. code-block:: python



    import utime

    import mcron

    import mcron.decorators



    c = 0



    def counter(callback_id, current_time, callback_memory):

        global c

        c += 1

        print('call: %s %s' % (c, utime.localtime()))



    mcron.init_timer()

    mcron.insert(mcron.PERIOD_MINUTE, range(0, mcron.PERIOD_MINUTE, 5), 'minute_5s', counter)



Start the task at exactly 6:30 a.m. and 10:30 p.m. every day.



.. code-block:: python



    mcron.insert(mcron.PERIOD_DAY, {6 * 60 * 60 + 30 * 60, 22 * 60 * 60 + 30 * 60}, 'day_6_30__22_30', callback)



Start the task 4 times a day.



.. code-block:: python



    mcron.insert(mcron.PERIOD_DAY, range(0, mcron.PERIOD_DAY, mcron.PERIOD_DAY // 4), 'day_x4', callback)



Start the task every 11 seconds from now.



.. code-block:: python



    mcron.insert(11, {0}, '11s_now', callback, from_now=True)



Start the task every 11 seconds.



.. code-block:: python



    mcron.insert(11, {0}, '11s', callback)



Start the task successfully three times. Start this task every 5 seconds.



.. code-block:: python



    mcron.insert(

        mcron.PERIOD_MINUTE, range(0, mcron.PERIOD_MINUTE, 5), 'minute_5s_3x_suc',

        mcron.decorators.successfully_run_times(3)(lambda *a, **k: utime.time() % 10 == 0)

    )



Start the task three times. Start this task every 5 seconds.



.. code-block:: python



    mcron.insert(

        mcron.PERIOD_MINUTE, range(0, mcron.PERIOD_MINUTE, 5), 'minute_5s_3x',

        mcron.decorators.run_times(3)(callback)

    )



Remove the action:



.. code-block:: python



    mcron.remove('action_id')



Remove all actions:



.. code-block:: python



    mcron.remove_all()



Capturing action errors is possible by replacing and/or adding your own function.



.. code-block:: python



    def my_exception_processor(e):

        send_exception_to_server(e)

        write_exception_to_disk(e)



    mcron.callback_exception_processors.append(my_exception_processor)



Important notes:

################



* If the execution time of all tasks is longer than (1000ms - 1.5 * _timer_period), then the TLPTimeException exception

  is thrown. This tells you that a task is blocking the device, and probably prevents the execution of the next action

  in the next second. It will be up to the programmer what he will do after intercepting this error. He can do nothing,

  and he can run the missed tasks.

* If there are several functions to run at a given time, then they are started without a specific order.



How to test

###########



Copy the tests.py file from the https://github.com/fizista/micropython-mcron.git repository to your test board

and run the command on this device:



.. code-block:: python



    import tests



*******************

Support and license

*******************



If you have found a mistake or other problem, write in the issues.



If you need a different license for this library (e.g. commercial),

please contact me: [email protected].



.. _SimpleCRON: https://github.com/fizista/micropython-scron