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Note

Free download CMake CMake for Mac OS X. CMake is a family of tools designed to build, test, and package software. Verify the latest cmake version is installed: cmake -version You can launch the CMake GUI by clicking on LaunchPad and typing cmake. Click on the CMake icon that appears.

This is documentation for the CMake-based build system which is currently in preview release. If you encounter any gaps or bugs, please report them in the Issues section of the ESP-IDF repository.

The CMake-based build system will become the default build system in ESP-IDF V4.0. The existing GNU Make based build system will be deprecated in ESP-IDF V5.0.

Important

The following features are not yet supported with the CMake-based build system:

  • Eclipse IDE Documentation

  • Secure Boot

  • Flash Encryption

Support for these features will be available before CMake becomes the default build system.

This document is intended to help users set up the software environment for development 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.

Note

This is documentation for branch release/v3.3 of ESP-IDF. Other ESP-IDF Versions are also available.

Introduction¶

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.

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.

What You Need¶

To develop applications for ESP32 you need:

  • PC loaded with either Windows, Linux or Mac operating system

  • Toolchain to compile code for ESP32

  • Build tools CMake and Ninja to build a full Application for ESP32

  • ESP-IDF that essentially contains API for ESP32 and scripts to operate the Toolchain

  • A text editor to write programs (Projects) in C, e.g. Eclipse

  • The ESP32 board itself and a USB cable to connect it to the PC

Installation Step by Step¶

This is a detailed roadmap to walk you through the installation process.

Setting up Development Environment¶

  • Step 1. Set up Toolchain for Windows, Linux or MacOS

Creating Your First Project¶

Development Board Guides¶

If you have one of ESP32 development boards listed below, click on the link for hardware setup:

If you have different board, move to sections below.

Step 1. Set up Toolchain¶

The quickest way to start development with ESP32 is by installing a prebuilt toolchain. Pick up your OS below and follow provided instructions.

Note

We are an using esp subdirectory in your user’s home directory (~/esp on Linux and MacOS, %userprofile%esp on Windows) to install everything needed for ESP-IDF. You can use any different directory, but will need to adjust the respective commands.

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 Customized Setup of Toolchain (CMake).

Step 2. Get ESP-IDF¶

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. To get it, open terminal, navigate to the directory you want to put ESP-IDF, and clone it using gitclone command.

Linux and MacOS¶

To obtain a local copy: open terminal, navigate to the directory you want to put ESP-IDF, and clone the repository using gitclone command:

ESP-IDF will be downloaded into ~/esp/esp-idf.

Consult ESP-IDF Versions for information about which version of ESP-IDF to use in a given situation.

Windows Command Prompt¶

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ESP-IDF will be downloaded into espesp-idf in the user’s profile directory.

Consult ESP-IDF Versions for information about which version of ESP-IDF to use in a given situation.

Note

The gitclone option -brelease/v3.3 tells git to clone the branch in the ESP-IDF repository gitclone corresponding to this version of the documentation.

Note

GitHub’s “Download zip file” feature does not work with ESP-IDF, a gitclone is required. As a fallback, Stable version can be installed without Git.

Note

Do not miss the --recursive option. If you have already cloned ESP-IDF without this option, run another command to get all the submodules:

Download

Step 3. Set Environment Variables¶

ESP-IDF requires two environment variables to be set for normal operation:

  • IDF_PATH should be set to the path to the ESP-IDF root directory.

  • PATH should include the path to the tools directory inside the same IDF_PATH directory.

These two variables 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 them permanently in user profile. To do this, follow instructions specific to Windows , Linux and MacOS in Section Add IDF_PATH & idf.py PATH to User Profile (CMake).

Step 4. Install the Required Python Packages¶

Python packages required by ESP-IDF are located in the $IDF_PATH/requirements.txt file. You can install them by running:

Note

Please invoke that version of the Python interpreter which you will be using with ESP-IDF. The version of theinterpreter can be checked by running command python--version and depending on the result, you might want touse python2, python2.7 or similar instead of python, e.g.:

Step 5. Start a Project¶

Now you are ready to prepare your application for ESP32. To start off quickly, we will use get-started/hello_world project from examples directory in IDF.

Copy get-started/hello_world to ~/esp directory:

Linux and MacOS¶

Windows Command Prompt¶

You can also find a range of example projects under the examples directory in ESP-IDF. These example project directories can be copied in the same way as presented above, to begin your own projects.

It is also possible to build examples in-place, without copying them first.

Important

The esp-idf build system does not support spaces in the path to either esp-idf or to projects.

Step 6. Connect the Device¶

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 Establish Serial Connection with ESP32 (CMake). Note the port number, as it will be required in the next step.

Step 7. Configure¶

Navigate to the directory of the hello_world application copy, and run the menuconfig project configuration utility:

Linux and MacOS¶

Windows Command Prompt¶

Note

If you get an error about idf.py not being found, check the tools directory is part of your Path as described above in Step 3. Set Environment Variables. If there is no idf.py in the tools directory, check you have the correct branch for the CMake preview as shown under Step 2. Get ESP-IDF.

Note

Windows users, the Python 2.7 installer will try to configure Windows to associate files with a .py extension with Python 2. If a separate installed program (such as Visual Studio Python Tools) has created an association with a different version of Python, then running idf.py may not work (it opens the file in Visual Studio instead). You can either run C:Python27pythonidf.py each time instead, or change the association that Windows uses for .py files.

Note

Linux users, if your default version of Python is 3.x then you may need to run python2idf.py instead.

If previous steps have been done correctly, the following menu will be displayed:

Here are couple of tips on navigation and use of menuconfig:

  • Use up & down arrow keys to navigate the menu.

  • Use Enter key to go into a submenu, Escape key to go up a level or exit.

  • Type ? to see a help screen. Enter key exits the help screen.

  • Use Space key, or Y and N keys to enable (Yes) and disable (No) configuration items with checkboxes “[*]

  • Pressing ? while highlighting a configuration item displays help about that item.

  • Type / to search the configuration items.

Attention

When using ESP32-DevKitC board with ESP32-SOLO-1 module, enable single core mode (CONFIG_FREERTOS_UNICORE) in menuconfig before flashing example applications.

Step 8. Build the Project¶

Now you can build the project. Run:

This command will compile the application and all the ESP-IDF components, generate bootloader, partition table, and application binaries.

If there are no errors, the build will finish by generating the firmware binary .bin file.

Step 9. Flash to a Device¶

Now you can flash the application to the ESP32 board. Run:

Replace PORT with the name of your ESP32 board’s serial port. On Windows, serial ports have names like COM1. On MacOS, they start with /dev/cu.. On Linux, they start with /dev/tty. See Establish Serial Connection with ESP32 (CMake) for full details.

This step will flash the binaries that you just built to your ESP32 board.

Note

Running idf.pybuild before idf.pyflash is not actually necessary, the flash step will automatically build the project if required before flashing.

If there are no issues, at the end of flash process, the module will be reset and “hello_world” application will be running there.

Step 10. Monitor¶

To see if “hello_world” application is indeed running, type idf.py-pPORTmonitor. This command is launching IDF Monitor application:

Several lines below, after start up and diagnostic log, you should see “Hello world!” printed out by the application.

To exit the monitor use shortcut Ctrl+].

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If instead of the messages above, you see a random garbage similar to what is shown below, or monitor fails shortly after upload, your board is likely using 26MHz crystal, while the ESP-IDF assumes default of 40MHz. Exit the monitor, go back to the menuconfig, change CONFIG_ESP32_XTAL_FREQ_SEL to 26MHz, then build and flash the application again. This is found under makemenuconfig under Component config –> ESP32-specific –> Main XTAL frequency.

Note

You can combine building, flashing and monitoring into one step as follows:

Check the Section IDF Monitor for handy shortcuts and more details on using the monitor.

Check the Section idf.py for a full reference of idf.py commands and options.

That’s all what you need to get started with ESP32!

Now you are ready to try some other examples, or go right to developing your own applications.

Updating ESP-IDF¶

You should update ESP-IDF from time to time, as newer versions fix bugs and provide new features. The simplest way to do the update is to delete the existing esp-idf folder and clone it again, as if performing the initial installation described in Step 2. Get ESP-IDF.

If downloading to a new path, remember to Add IDF_PATH & idf.py PATH to User Profile (CMake) so that the toolchain scripts know where to find the ESP-IDF in its release specific location.

Another solution is to update only what has changed. The update procedure depends on the version of ESP-IDF you are using.

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