.. _getting_started:

Getting Started Guide
#####################

Follow this guide to:

- Set up a command-line Zephyr development environment on Ubuntu, macOS, or
  Windows (instructions for other Linux distributions are discussed in
  :ref:`installation_linux`)
- Get the source code
- Build, flash, and run a sample application

.. _host_setup:

.. rst-class:: numbered-step

Select and Update OS
********************

Click the operating system you are using.

.. tabs::

   .. group-tab:: Ubuntu

      This guide covers Ubuntu version 18.04 LTS and later.

      .. code-block:: bash

         sudo apt update
         sudo apt upgrade

   .. group-tab:: macOS

      On macOS Mojave or later, select *System Preferences* >
      *Software Update*. Click *Update Now* if necessary.

      On other versions, see `this Apple support topic
      <https://support.apple.com/en-us/HT201541>`_.

   .. group-tab:: Windows

      Select *Start* > *Settings* > *Update & Security* > *Windows Update*.
      Click *Check for updates* and install any that are available.

.. _install-required-tools:

.. rst-class:: numbered-step

Install dependencies
********************

Next, you'll install some host dependencies using your package manager.

The current minimum required version for the main dependencies are:

.. list-table::
   :header-rows: 1

   * - Tool
     - Min. Version

   * - `CMake <https://cmake.org/>`_
     - 3.13.1

   * - `Python <https://www.python.org/>`_
     - 3.6

   * - `Devicetree compiler <https://www.devicetree.org/>`_
     - 1.4.6

.. tabs::

   .. group-tab:: Ubuntu

      .. _install_dependencies_ubuntu:

      #. Use ``apt`` to install the required dependencies:

         .. code-block:: bash

            sudo apt install --no-install-recommends git cmake ninja-build gperf \
              ccache dfu-util device-tree-compiler wget \
              python3-dev python3-pip python3-setuptools python3-tk python3-wheel xz-utils file \
              make gcc gcc-multilib g++-multilib libsdl2-dev

      #. Verify the versions of the main dependencies installed on your system by entering::

            cmake --version
            python3 --version
            dtc --version

         Check those against the versions in the table in the beginning of this section.
         Refer to the :ref:`installation_linux` page for additional information on updating
         the dependencies manually.

   .. group-tab:: macOS

      .. _install_dependencies_macos:

      #. Install `Homebrew <https://brew.sh/>`_:

         .. code-block:: bash

            /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

      #. Use ``brew`` to install the required dependencies:

         .. code-block:: bash

            brew install cmake ninja gperf python3 ccache qemu dtc

   .. group-tab:: Windows

      .. note::

         Due to issues finding executables, the Zephyr Project doesn't
         currently support application flashing using the `Windows Subsystem
         for Linux (WSL)
         <https://msdn.microsoft.com/en-us/commandline/wsl/install_guide>`_
         (WSL).

         Therefore, we don't recommend using WSL when getting started.

      These instructions must be run in a ``cmd.exe`` command prompt. The
      required commands differ on PowerShell.

      These instructions rely on `Chocolatey`_. If Chocolatey isn't an option,
      you can install dependencies from their respective websites and ensure
      the command line tools are on your :envvar:`PATH` :ref:`environment
      variable <env_vars>`.

      |p|

      .. _install_dependencies_windows:

      #. `Install chocolatey`_.

      #. Open a ``cmd.exe`` window as **Administrator**. To do so, press the Windows key,
         type "cmd.exe", right-click the result, and choose :guilabel:`Run as
         Administrator`.

      #. Disable global confirmation to avoid having to confirm the
         installation of individual programs:

         .. code-block:: console

            choco feature enable -n allowGlobalConfirmation

      #. Use ``choco`` to install the required dependencies:

         .. code-block:: console

            choco install cmake --installargs 'ADD_CMAKE_TO_PATH=System'
            choco install ninja gperf python git

      #. Close the window and open a new ``cmd.exe`` window **as a regular user** to continue.

.. _Chocolatey: https://chocolatey.org/
.. _Install chocolatey: https://chocolatey.org/install

.. _get_the_code:
.. _clone-zephyr:
.. _install_py_requirements:
.. _gs_python_deps:

.. rst-class:: numbered-step

Get Zephyr and install Python dependencies
******************************************

Next, clone Zephyr and its :ref:`modules <modules>` into a new :ref:`west
<west>` workspace named :file:`zephyrproject`. You'll also install Zephyr's
additional Python dependencies.

Python is used by the ``west`` meta-tool as well as by many scripts invoked by
the build system. It is easy to run into package incompatibilities when
installing dependencies at a system or user level. This situation can happen,
for example, if working on multiple Zephyr versions at the same time. For this
reason it is suggested to use `Python virtual environments`_.

.. _Python virtual environments: https://docs.python.org/3/library/venv.html

.. tabs::

   .. group-tab:: Ubuntu

      .. tabs::

         .. group-tab:: Install globally

            #. Install west, and make sure :file:`~/.local/bin` is on your
               :envvar:`PATH` :ref:`environment variable <env_vars>`:

               .. code-block:: bash

                  pip3 install --user -U west
                  echo 'export PATH=~/.local/bin:"$PATH"' >> ~/.bashrc
                  source ~/.bashrc

            #. Get the Zephyr source code:

               .. code-block:: bash

                  west init ~/zephyrproject
                  cd ~/zephyrproject
                  west update

            #. Export a :ref:`Zephyr CMake package <cmake_pkg>`. This allows CMake to
               automatically load boilerplate code required for building Zephyr
               applications.

               .. code-block:: console

                  west zephyr-export

            #. Zephyr's ``scripts/requirements.txt`` file declares additional Python
               dependencies. Install them with ``pip3``.

               .. code-block:: bash

                  pip3 install --user -r ~/zephyrproject/zephyr/scripts/requirements.txt

         .. group-tab:: Install within virtual environment

            #. Create a new virtual environment:

               .. code-block:: bash

                  python3 -m venv ~/zephyrproject/.venv

            #. Activate the virtual environment:

               .. code-block:: bash

                  source ~/zephyrproject/.venv/bin/activate

               Once activated your shell will be prefixed with ``(.venv)``. The
               virtual environment can be deactivated at any time by running
               ``deactivate``.

               .. note::

                  Remember to activate the virtual environment every time you
                  start working.

            #. Install west:

               .. code-block:: bash

                  pip install west

            #. Get the Zephyr source code:

               .. code-block:: bash

                 west init ~/zephyrproject
                 cd ~/zephyrproject
                 west update

            #. Export a :ref:`Zephyr CMake package <cmake_pkg>`. This allows CMake to
               automatically load boilerplate code required for building Zephyr
               applications.

               .. code-block:: console

                  west zephyr-export

            #. Zephyr's ``scripts/requirements.txt`` file declares additional Python
               dependencies. Install them with ``pip``.

               .. code-block:: bash

                  pip install -r ~/zephyrproject/zephyr/scripts/requirements.txt

   .. group-tab:: macOS

      .. tabs::

         .. group-tab:: Install globally

            #. Install west:

               .. code-block:: bash

                  pip3 install -U west

            #. Get the Zephyr source code:

               .. code-block:: bash

                  west init ~/zephyrproject
                  cd ~/zephyrproject
                  west update

            #. Export a :ref:`Zephyr CMake package <cmake_pkg>`. This allows CMake to
               automatically load boilerplate code required for building Zephyr
               applications.

               .. code-block:: console

                  west zephyr-export

            #. Zephyr's ``scripts/requirements.txt`` file declares additional Python
               dependencies. Install them with ``pip3``.

               .. code-block:: bash

                  pip3 install -r ~/zephyrproject/zephyr/scripts/requirements.txt

         .. group-tab:: Install within virtual environment

            #. Create a new virtual environment:

               .. code-block:: bash

                  python3 -m venv ~/zephyrproject/.venv

            #. Activate the virtual environment:

               .. code-block:: bash

                  source ~/zephyrproject/.venv/bin/activate

               Once activated your shell will be prefixed with ``(.venv)``. The
               virtual environment can be deactivated at any time by running
               ``deactivate``.

               .. note::

                  Remember to activate the virtual environment every time you
                  start working.

            #. Install west:

               .. code-block:: bash

                  pip install west

            #. Get the Zephyr source code:

               .. code-block:: bash

                  west init ~/zephyrproject
                  cd ~/zephyrproject
                  west update

            #. Export a :ref:`Zephyr CMake package <cmake_pkg>`. This allows CMake to
               automatically load boilerplate code required for building Zephyr
               applications.

               .. code-block:: console

                  west zephyr-export

            #. Zephyr's ``scripts/requirements.txt`` file declares additional Python
               dependencies. Install them with ``pip``.

               .. code-block:: bash

                  pip install -r ~/zephyrproject/zephyr/scripts/requirements.txt

   .. group-tab:: Windows

      .. tabs::

         .. group-tab:: Install globally

            #. Install west:

               .. code-block:: bat

                  pip3 install -U west

            #. Get the Zephyr source code:

               .. code-block:: bat

                  cd %HOMEPATH%
                  west init zephyrproject
                  cd zephyrproject
                  west update

            #. Export a :ref:`Zephyr CMake package <cmake_pkg>`. This allows CMake to
               automatically load boilerplate code required for building Zephyr
               applications.

               .. code-block:: bat

                  west zephyr-export

            #. Zephyr's ``scripts\requirements.txt`` file declares additional Python
               dependencies. Install them with ``pip3``.

               .. code-block:: bat

                  pip3 install -r %HOMEPATH%\zephyrproject\zephyr\scripts\requirements.txt

         .. group-tab:: Install within virtual environment

            #. Create a new virtual environment:

               .. code-block:: bat

                  cd %HOMEPATH%
                  python3 -m venv zephyrproject\.venv

            #. Activate the virtual environment:

               .. code-block:: bat

                  :: cmd.exe
                  zephyrproject\.venv\Scripts\activate.bat
                  :: PowerShell
                  zephyrproject\.venv\Scripts\Activate.ps1

               Once activated your shell will be prefixed with ``(.venv)``. The
               virtual environment can be deactivated at any time by running
               ``deactivate``.

               .. note::

                  Remember to activate the virtual environment every time you
                  start working.

            #. Install west:

               .. code-block:: bash

                  pip install west

            #. Get the Zephyr source code:

               .. code-block:: bash

                  west init zephyrproject
                  cd zephyrproject
                  west update

            #. Export a :ref:`Zephyr CMake package <cmake_pkg>`. This allows CMake to
               automatically load boilerplate code required for building Zephyr
               applications.

               .. code-block:: console

                  west zephyr-export

            #. Zephyr's ``scripts\requirements.txt`` file declares additional Python
               dependencies. Install them with ``pip``.

               .. code-block:: bash

                  pip install -r %HOMEPATH%\zephyrproject\zephyr\scripts\requirements.txt

.. rst-class:: numbered-step

Install a Toolchain
*******************

A toolchain provides a compiler, assembler, linker, and other programs required
to build Zephyr applications.

.. tabs::

   .. group-tab:: Ubuntu

      The Zephyr Software Development Kit (SDK) contains toolchains for each of
      Zephyr's supported architectures. It also includes additional host tools,
      such as custom QEMU binaries and a host compiler.

      |p|

      #. Download the `latest SDK installer
         <https://github.com/zephyrproject-rtos/sdk-ng/releases>`_:

         .. code-block:: bash

            cd ~
            wget https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.12.4/zephyr-sdk-0.12.4-x86_64-linux-setup.run

      #. Run the installer, installing the SDK in :file:`~/zephyr-sdk-0.12.4`:

         .. code-block:: bash

            chmod +x zephyr-sdk-0.12.4-x86_64-linux-setup.run
            ./zephyr-sdk-0.12.4-x86_64-linux-setup.run -- -d ~/zephyr-sdk-0.12.4

         .. note::
            It is recommended to install the Zephyr SDK at one of the following locations:

            * ``$HOME/zephyr-sdk[-x.y.z]``
            * ``$HOME/.local/zephyr-sdk[-x.y.z]``
            * ``$HOME/.local/opt/zephyr-sdk[-x.y.z]``
            * ``$HOME/bin/zephyr-sdk[-x.y.z]``
            * ``/opt/zephyr-sdk[-x.y.z]``
            * ``/usr/zephyr-sdk[-x.y.z]``
            * ``/usr/local/zephyr-sdk[-x.y.z]``

            where ``[-x.y.z]`` is optional text, and can be any text, for example ``-0.12.4``.

            If installing the Zephyr SDK outside any of those locations, please read: :ref:`zephyr_sdk`

            You cannot move the SDK directory after you have installed it.

      #. Install `udev <https://en.wikipedia.org/wiki/Udev>`_ rules, which
         allow you to flash most Zephyr boards as a regular user:

         .. code-block:: bash

            sudo cp ~/zephyr-sdk-0.12.4/sysroots/x86_64-pokysdk-linux/usr/share/openocd/contrib/60-openocd.rules /etc/udev/rules.d
            sudo udevadm control --reload

   .. group-tab:: macOS

      Follow the instructions in :ref:`gs_toolchain`. Note that the Zephyr SDK
      is not available on macOS.

      Do not forget to set the required :ref:`environment variables <env_vars>`
      (:envvar:`ZEPHYR_TOOLCHAIN_VARIANT` and toolchain specific ones).

   .. group-tab:: Windows

      Follow the instructions in :ref:`gs_toolchain`. Note that the Zephyr SDK
      is not available on Windows.

      Do not forget to set the required :ref:`environment variables <env_vars>`
      (:envvar:`ZEPHYR_TOOLCHAIN_VARIANT` and toolchain specific ones).

.. _getting_started_run_sample:

.. rst-class:: numbered-step

Build the Blinky Sample
***********************

.. note::

   Blinky is compatible with most, but not all, :ref:`boards`. If your board
   does not meet Blinky's :ref:`blinky-sample-requirements`, then
   :ref:`hello_world` is a good alternative.

Build the :ref:`blinky-sample` with :ref:`west build <west-building>`, changing
``<your-board-name>`` appropriately for your board:

.. tabs::

   .. group-tab:: Ubuntu

      .. code-block:: bash

         cd ~/zephyrproject/zephyr
         west build -p auto -b <your-board-name> samples/basic/blinky

   .. group-tab:: macOS

      .. code-block:: bash

         cd ~/zephyrproject/zephyr
         west build -p auto -b <your-board-name> samples/basic/blinky

   .. group-tab:: Windows

      .. code-block:: bat

         cd %HOMEPATH%\zephyrproject\zephyr
         west build -p auto -b <your-board-name> samples\basic\blinky

The ``-p auto`` option automatically cleans byproducts from a previous build
if necessary, which is useful if you try building another sample.

.. rst-class:: numbered-step

Flash the Sample
****************

Connect your board, usually via USB, and turn it on if there's a power switch.
If in doubt about what to do, check your board's page in :ref:`boards`.

Then flash the sample using :ref:`west flash <west-flashing>`:

.. code-block:: console

   west flash

You may need to install additional :ref:`host tools <flash-debug-host-tools>`
required by your board. The ``west flash`` command will print an error if any
required dependencies are missing.

If you're using blinky, the LED will start to blink as shown in this figure:

.. figure:: img/ReelBoard-Blinky.png
   :width: 400px
   :name: reelboard-blinky

   Phytec :ref:`reel_board <reel_board>` running blinky

Next Steps
**********

Here are some next steps for exploring Zephyr:

* Try other :ref:`samples-and-demos`
* Learn about :ref:`application` and the :ref:`west <west>` tool
* Find out about west's :ref:`flashing and debugging <west-build-flash-debug>`
  features, or more about :ref:`flashing_and_debugging` in general
* Check out :ref:`beyond-GSG` for additional setup alternatives and ideas
* Discover :ref:`project-resources` for getting help from the Zephyr
  community

.. _help:

Asking for Help
***************

You can ask for help on a mailing list or on Slack. Please send bug reports and
feature requests to GitHub.

* **Mailing Lists**: users@lists.zephyrproject.org is usually the right list to
  ask for help. `Search archives and sign up here`_.
* **Slack**: Zephyr's workspace is https://zephyrproject.slack.com; you can
  register with this `Slack invite`_.
* **GitHub**: Use `GitHub issues`_ for bugs and feature requests.

How to Ask
==========

.. important::

   Please search this documentation and the mailing list archives first. Your
   question may have an answer there.

Don't just say "this isn't working" or ask "is this working?". Include as much
detail as you can about:

#. What you want to do
#. What you tried (commands you typed, etc.)
#. What happened (output of each command, etc.)

Use Copy/Paste
==============

Please **copy/paste text** instead of taking a picture or a screenshot of it.
Text includes source code, terminal commands, and their output.

Doing this makes it easier for people to help you, and also helps other users
search the archives.

When copy/pasting more than 5 lines of text into Slack, create a `snippet`_.

.. _Search archives and sign up here: https://lists.zephyrproject.org/g/users
.. _Slack invite: https://tinyurl.com/y5glwylp
.. _GitHub issues: https://github.com/zephyrproject-rtos/zephyr/issues
.. _snippet: https://get.slack.help/hc/en-us/articles/204145658-Create-a-snippet