5a88f90a33
Since 9a8c0392, XTAL frequency is set to 40MHz by default, and users
of 26MHz boards need to select 26MHz manually. Most users are not aware
of this change, and existing getting started guides do not mention that
XTAL frequency needs to be set for some boards. So users are left with
garbage output from UART without any clue what to check.
This change adds a warning in case specific XTAL frequency was set, and
it does not match automatically detected one. This should help users
fix the issue.
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***********
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Get Started
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***********
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This document is intended to help users set up the software environment for developement of applications using hardware based on the Espressif ESP32. Through a simple example we would like to illustrate how to use ESP-IDF (Espressif IoT Development Framework), including the menu based configuration, compiling the ESP-IDF and firmware download to ESP32 boards.
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Introduction
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============
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ESP32 integrates Wi-Fi (2.4 GHz band) and Bluetooth 4.2 solutions on a single chip, along with dual high performance cores, Ultra Low Power co-processor and several peripherals. Powered by 40 nm technology, ESP32 provides a robust, highly integrated platform to meet the continuous demands for efficient power usage, compact design, security, high performance, and reliability.
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Espressif provides the basic hardware and software resources that help application developers to build their ideas around the ESP32 series hardware. The software development framework by Espressif is intended for rapidly developing Internet-of-Things (IoT) applications, with Wi-Fi, Bluetooth, power management and several other system features.
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What You Need
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=============
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To develop applications for ESP32 you need:
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* **PC** loaded with either Windows, Linux or Mac operating system
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* **Toolchain** to build the **Application** for ESP32
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* **ESP-IDF** that essentially contains API for ESP32 and scripts to operate the **Toolchain**
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* A text editor to write programs (**Projects**) in C, e.g. `Eclipse <https://www.eclipse.org/>`_
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* The **ESP32** board itself and a **USB cable** to connect it to the **PC**
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.. figure:: ../_static/what-you-need.png
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:align: center
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:alt: Development of applications for ESP32
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:figclass: align-center
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Development of applications for ESP32
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Preparation of development environment consists of three steps:
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1. Setup of **Toolchain**
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2. Getting of **ESP-IDF** from GitHub
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3. Installation and configuration of **Eclipse**
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You may skip the last step, if you prefer to use different editor.
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Having environment set up, you are ready to start the most interesting part - the application development. This process may be summarized in four steps:
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1. Configuration of a **Project** and writing the code
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2. Compilation of the **Project** and linking it to build an **Application**
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3. Flashing (uploading) of the **Application** to **ESP32**
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4. Monitoring / debugging of the **Application**
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See instructions below that will walk you through these steps.
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Guides
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======
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If you have one of ESP32 development boards listed below, click on provided links to get you up and running.
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.. toctree::
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:maxdepth: 1
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ESP32 DevKitC <get-started-devkitc>
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ESP-WROVER-KIT <get-started-wrover-kit>
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If you have different board, move to sections below.
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.. _get-started-setup-toolchain:
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Setup Toolchain
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===============
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The quickest way to start development with ESP32 is by installing a prebuilt toolchain. Pick up your OS below and follow provided instructions.
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.. toctree::
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:hidden:
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Windows <windows-setup>
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Linux <linux-setup>
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MacOS <macos-setup>
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+-------------------+-------------------+-------------------+
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| |windows-logo| | |linux-logo| | |macos-logo| |
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+-------------------+-------------------+-------------------+
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| `Windows`_ | `Linux`_ | `Mac OS`_ |
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+-------------------+-------------------+-------------------+
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.. |windows-logo| image:: ../_static/windows-logo.png
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:target: ../get-started/windows-setup.html
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.. |linux-logo| image:: ../_static/linux-logo.png
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:target: ../get-started/linux-setup.html
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.. |macos-logo| image:: ../_static/macos-logo.png
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:target: ../get-started/macos-setup.html
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.. _Windows: ../get-started/windows-setup.html
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.. _Linux: ../get-started/linux-setup.html
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.. _Mac OS: ../get-started/macos-setup.html
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.. note::
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We are using ``~/esp`` directory to install the prebuilt toolchain, ESP-IDF and sample applications. You can use different directory, but need to adjust respective commands.
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Depending on your experience and preferences, instead of using a prebuilt toolchain, you may want to customize your environment. To set up the system your own way go to section :ref:`get-started-customized-setup`.
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Once you are done with setting up the toolchain then go to section :ref:`get-started-get-esp-idf`.
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.. _get-started-get-esp-idf:
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Get ESP-IDF
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===========
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.. highlight:: bash
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Besides the toolchain (that contains programs to compile and build the application), you also need ESP32 specific API / libraries. They are provided by Espressif in `ESP-IDF repository <https://github.com/espressif/esp-idf>`_. To get it, open terminal, navigate to the directory you want to put ESP-IDF, and clone it using ``git clone`` command::
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cd ~/esp
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git clone --recursive https://github.com/espressif/esp-idf.git
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ESP-IDF will be downloaded into ``~/esp/esp-idf``.
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.. note::
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Do not miss the ``--recursive`` option. If you have already cloned ESP-IDF without this option, run another command to get all the submodules::
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cd ~/esp/esp-idf
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git submodule update --init
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.. note::
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While cloning submodules on **Windows** platform, the ``git clone`` command may print some output starting ``': not a valid identifier...``. This is a `known issue <https://github.com/espressif/esp-idf/issues/11>`_ but the git clone still succeeds without any problems.
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.. _get-started-setup-path:
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Setup Path to ESP-IDF
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=====================
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The toolchain programs access ESP-IDF using ``IDF_PATH`` environment variable. This variable should be set up on your PC, otherwise projects will not build. Setting may be done manually, each time PC is restarted. Another option is to set up it permanently by defining ``IDF_PATH`` in user profile. To do so, follow instructions specific to :ref:`Windows <add-idf_path-to-profile-windows>` , :ref:`Linux and MacOS <add-idf_path-to-profile-linux-macos>` in section :doc:`add-idf_path-to-profile`.
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.. _get-started-start-project:
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Start a Project
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===============
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Now you are ready to prepare your application for ESP32. To start off quickly, we will use :example:`get-started/hello_world` project from :idf:`examples` directory in IDF.
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Copy :example:`get-started/hello_world` to ``~/esp`` directory::
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cd ~/esp
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cp -r $IDF_PATH/examples/get-started/hello_world .
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You can also find a range of example projects under the :idf:`examples` directory in ESP-IDF. These example project directories can be copied in the same way as presented above, to begin your own projects.
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.. important::
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The esp-idf build system does not support spaces in paths to esp-idf or to projects.
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.. _get-started-connect:
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Connect
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=======
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You are almost there. To be able to proceed further, connect ESP32 board to PC, check under what serial port the board is visible and verify if serial communication works. If you are not sure how to do it, check instructions in section :doc:`establish-serial-connection`. Note the port number, as it will be required in the next step.
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.. _get-started-configure:
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Configure
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=========
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Being in terminal window, go to directory of ``hello_world`` application by typing ``cd ~/esp/hello_world``. Then start project configuration utility ``menuconfig``::
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cd ~/esp/hello_world
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make menuconfig
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If previous steps have been done correctly, the following menu will be displayed:
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.. figure:: ../_static/project-configuration.png
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:align: center
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:alt: Project configuration - Home window
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:figclass: align-center
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Project configuration - Home window
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In the menu, navigate to ``Serial flasher config`` > ``Default serial port`` to configure the serial port, where project will be loaded to. Confirm selection by pressing enter, save configuration by selecting ``< Save >`` and then exit application by selecting ``< Exit >``.
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.. note::
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On Windows, serial ports have names like COM1. On MacOS, they start with ``/dev/cu.``. On Linux, they start with ``/dev/tty``.
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(See :doc:`establish-serial-connection` for full details.)
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Here are couple of tips on navigation and use of ``menuconfig``:
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* Use up & down arrow keys to navigate the menu.
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* Use Enter key to go into a submenu, Escape key to go out or to exit.
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* Type ``?`` to see a help screen. Enter key exits the help screen.
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* Use Space key, or ``Y`` and ``N`` keys to enable (Yes) and disable (No) configuration items with checkboxes "``[*]``"
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* Pressing ``?`` while highlighting a configuration item displays help about that item.
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* Type ``/`` to search the configuration items.
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.. note::
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If you are **Arch Linux** user, navigate to ``SDK tool configuration`` and change the name of ``Python 2 interpreter`` from ``python`` to ``python2``.
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.. note::
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Most ESP32 development boards have a 40MHz crystal installed. However, some boards use a 26MHz crystal. If your board uses a 26MHz crystal, or you get garbage output from serial port after code upload, adjust the :ref:`CONFIG_ESP32_XTAL_FREQ` option in menuconfig.
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.. _get-started-build-flash:
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Build and Flash
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===============
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Now you can build and flash the application. Run::
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make flash
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This will compile the application and all the ESP-IDF components, generate bootloader, partition table, and application binaries, and flash these binaries to your ESP32 board.
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.. highlight:: none
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::
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esptool.py v2.0-beta2
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Flashing binaries to serial port /dev/ttyUSB0 (app at offset 0x10000)...
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esptool.py v2.0-beta2
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Connecting........___
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Uploading stub...
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Running stub...
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Stub running...
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Changing baud rate to 921600
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Changed.
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Attaching SPI flash...
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Configuring flash size...
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Auto-detected Flash size: 4MB
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Flash params set to 0x0220
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Compressed 11616 bytes to 6695...
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Wrote 11616 bytes (6695 compressed) at 0x00001000 in 0.1 seconds (effective 920.5 kbit/s)...
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Hash of data verified.
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Compressed 408096 bytes to 171625...
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Wrote 408096 bytes (171625 compressed) at 0x00010000 in 3.9 seconds (effective 847.3 kbit/s)...
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Hash of data verified.
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Compressed 3072 bytes to 82...
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Wrote 3072 bytes (82 compressed) at 0x00008000 in 0.0 seconds (effective 8297.4 kbit/s)...
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Hash of data verified.
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Leaving...
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Hard resetting...
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If there are no issues, at the end of build process, you should see messages describing progress of loading process. Finally, the end module will be reset and "hello_world" application will start.
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If you'd like to use the Eclipse IDE instead of running ``make``, check out the :doc:`Eclipse guide <eclipse-setup>`.
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.. _get-started-build-monitor:
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Monitor
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=======
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To see if "hello_world" application is indeed running, type ``make monitor``. This command is launching :doc:`IDF Monitor <idf-monitor>` application::
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$ make monitor
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MONITOR
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--- idf_monitor on /dev/ttyUSB0 115200 ---
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--- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
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ets Jun 8 2016 00:22:57
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rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
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ets Jun 8 2016 00:22:57
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...
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Several lines below, after start up and diagnostic log, you should see "Hello world!" printed out by the application. ::
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...
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Hello world!
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Restarting in 10 seconds...
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I (211) cpu_start: Starting scheduler on APP CPU.
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Restarting in 9 seconds...
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Restarting in 8 seconds...
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Restarting in 7 seconds...
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To exit monitor use shortcut ``Ctrl+]``. To execute ``make flash`` and ``make monitor`` in one shoot type ``make flash monitor``. Check section :doc:`IDF Monitor <idf-monitor>` for handy shortcuts and more details on using this application.
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Related Documents
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=================
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.. toctree::
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:maxdepth: 1
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add-idf_path-to-profile
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establish-serial-connection
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make-project
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eclipse-setup
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idf-monitor
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toolchain-setup-scratch
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