Watch Application System in Python
==================================

Introduction
------------

Currently in its infancy wasp-os provides only a little more than a simple
digital clock application for `PineTime <https://www.pine64.org/pinetime/>`_
together with access to the MicroPython REPL for interactive testing and
tweaking. However it keeps time well and has enough power saving
functions implemented that it can survive for well over 72 hours between
charges so even at this early stage it is functional as a wearable
timepiece.

Wasp-os includes a robust bootloader based on the Adafruit NRF52
Bootloader. It has been extended to make it robust for development on
form-factor devices without a reset button, power switch, SWD debugger
or UART. This allows us to confidently develop on sealed devices relying
only on BLE for updates.

Videos
------

.. image:: https://img.youtube.com/vi/YktiGUSRJB4/0.jpg
   :target: https://www.youtube.com/watch?v=YktiGUSRJB4
   :alt: An M2 pre-release running on Pine64 PineTime

`An M2 pre-release running on Pine64 PineTime <https://www.youtube.com/watch?v=YktiGUSRJB4>`_

.. image:: https://img.youtube.com/vi/tuk9Nmr3Jo8/0.jpg
   :target: https://www.youtube.com/watch?v=tuk9Nmr3Jo8
   :alt: How to develop wasp-os python applications on a Pine64 PineTime

`How to develop wasp-os python applications on a Pine64 PineTime <https://www.youtube.com/watch?v=tuk9Nmr3Jo8>`_

.. image:: https://img.youtube.com/vi/kf1VHj587Mc/0.jpg
   :target: https://www.youtube.com/watch?v=kf1VHj587Mc
   :alt: Developing for Pine64 PineTime using wasp-os and MicroPython

`Developing for Pine64 PineTime using wasp-os and MicroPython <https://www.youtube.com/watch?v=kf1VHj587Mc>`_

Documentation
-------------

Wasp-os is has `extensive documentation <https://wasp-os.readthedocs.io>`_
which includes a detailed `Applicaiton Writer's Guide
<https://wasp-os.readthedocs.io/en/latest/appguide.html>`_ to help you
get started coding for wasp-os as quickly as possible.

Building from source
--------------------

Building wasp-os and launching the wasp-os simulator requires Python 3.6
(or later) and the following python modules: click, numpy, pexpect, PIL
(or Pillow), pyserial, pysdl2.

On Debian Buster the requires python modules can be obtain with the
following commands:

.. code-block:: sh

    sudo apt install \
      git build-essential libsdl2-2.0.0 \
      python3-click python3-numpy python3-pexpect \
      python3-pil python3-pip python3-serial
    pip3 install --user pysdl2

You will need a toolchain for the Arm Cortex-M4. wasp-os is developed and
tested using the `GNU-RM toolchain
<https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm>`_
(9-2019-q4) from Arm.

.. note::

    There are known problems with toolchains older than gcc-7.3 due to problems
    with link-time-optimization (which is enabled by default).

Get the code from
`https://github.com/daniel-thompson/wasp-os <https://github.com/daniel-thompson/wasp-os>`_ :

.. code-block:: sh

   git clone https://github.com/daniel-thompson/wasp-os
   cd wasp-os
   make submodules
   make softdevice

Build the firmware:

.. code-block:: sh

   make -j `nproc` BOARD=pinetime all

Finally to test out ideas and concepts on the simulator try:

.. code-block:: sh

    make sim

See :ref:`Testing on the simulator` for more details on how
to use the simulator.

Installing
----------

Use an SWD programmer to install ``bootloader.hex`` to the PineTime.
This file is an Intel HEX file containing both the bootloader and the Nordic
SoftDevice. Once the bootloader is installed the watch will boot, display the
Pine64 logo and wait for a OTA update.

See the `PineTime SWD programming guide <https://wiki.pine64.org/index.php/Reprogramming_the_PineTime>`_
for instructions on how to reprogram the PineTime using various different SWD
programmers.

.. note::

    If you have a new PineTime then it will have been delivered with flash
    protection enabled. You must disable the flash protection before trying to
    program it.

    Be careful to disconnect cleanly from the debug software since just pulling
    out the SWD cable will mean the nRF52 will still believe it is being
    debugged (which harms battery life because the device won't properly enter
    deep sleep states).

To install the main firmware using an Android device:

* Copy ``micropython.zip`` to your Android device and download nRF Connect
  for Android if you do not already have it.
* In nRF Connect, choose settings and reduce the DFU packet count from
  10 to 4.
* Connect to PineDFU using nRFConnect, click the DFU button and send
  ``micropython.zip`` to the device.

To install the main firmware from a GNU/Linux workstation:

* Look up the MAC address for your watch (try: ``sudo hcitool lescan``\ ).
* Use ota-dfu to upload ``micropython.zip`` to the device. For example:
  ``tools/ota-dfu/dfu.py -z micropython.zip -a A0:B1:C2:D3:E3:F5 --legacy``

At the end of this process your watch will show the time (03:00) together
with a date and battery meter. When the watch goes into power saving mode
you can use the side button to wake it again.

At this point you will also be able to use the Nordic UART Service to
access the MicroPython REPL, although currently you must send ^C to
interrupt the program that updates the watch display. You can use 
``tools/wasptool --console`` to access the MicroPython REPL.

To set the time and restart the main application:

.. code-block:: python

   ^C
   watch.rtc.set_localtime((yyyy, mm, dd, HH, MM, SS))
   wasp.system.run()

Or just use:

.. code-block:: sh

   ./tools/wasptool --rtc

which can run these commands automatically.

As mentioned above there are many drivers and features still to be
developed, see the :ref:`Roadmap` for current status.

Screenshots
-----------

.. image:: res/clock_app.jpg
   :alt: wasp-os digital clock app running on PineTime