Standard Setup of Toolchain for Windows
ESP-IDF requires some prerequisite tools to be installed so you can build firmware for supported chips. The prerequisite tools include Python, Git, cross-compilers, CMake and Ninja build tools.
For this Getting Started we’re going to use the Command Prompt, but after ESP-IDF is installed you can use Eclipse or another graphical IDE with CMake support instead.
Limitations: - The installation path of ESP-IDF and ESP-IDF Tools must not be longer than 90 characters. Too long installation paths might result in a failed build. - The installation path of Python or ESP-IDF must not contain white spaces or parentheses. - The installation path of Python or ESP-IDF should not contain special characters (non-ASCII) unless the operating system is configured with “Unicode UTF-8” support.
System Administrator can enable the support via Control Panel - Change date, time, or number formats - Administrative tab - Change system locale - check the option “Beta: Use Unicode UTF-8 for worldwide language support” - Ok and reboot the computer.
ESP-IDF Tools Installer
The easiest way to install ESP-IDF’s prerequisites is to download one of ESP-IDF Tools Installers.
What is the usecase for Online and Offline Installer
Online Installer is very small and allows the installation of all available releases of ESP-IDF. The installer will download only necessary dependencies including Git For Windows during the installation process. The installer stores downloaded files in the cache directory
Offline Installer does not require any network connection. The installer contains all required dependencies including Git For Windows .
Components of the installation
The installer deploys the following components:
The installer also allows reusing the existing directory with ESP-IDF. The recommended directory is
%userprofile% is your home directory.
Launching ESP-IDF Environment
At the end of the installation process you can check out option
Run ESP-IDF PowerShell Environment or
Run ESP-IDF Command Prompt (cmd.exe). The installer will launch ESP-IDF environment in selected prompt.
Run ESP-IDF PowerShell Environment:
Run ESP-IDF Command Prompt (cmd.exe):
Using the Command Prompt
For the remaining Getting Started steps, we’re going to use the Windows Command Prompt.
ESP-IDF Tools Installer also creates a shortcut in the Start menu to launch the ESP-IDF Command Prompt. This shortcut launches the Command Prompt (cmd.exe) and runs
export.bat script to set up the environment variables (
IDF_PATH and others). Inside this command prompt, all the installed tools are available.
Note that this shortcut is specific to the ESP-IDF directory selected in the ESP-IDF Tools Installer. If you have multiple ESP-IDF directories on the computer (for example, to work with different versions of ESP-IDF), you have two options to use them:
Create a copy of the shortcut created by the ESP-IDF Tools Installer, and change the working directory of the new shortcut to the ESP-IDF directory you wish to use.
cmd.exe, then change to the ESP-IDF directory you wish to use, and run
export.bat. Note that unlike the previous option, this way requires Python and Git to be present in
PATH. If you get errors related to Python or Git not being found, use the first option.
First Steps on ESP-IDF
Now since all requirements are met, the next topic will guide you on how to start your first project.
This guide will help you on the first steps using ESP-IDF. Follow this guide to start a new project on the ESP32-S2 and build, flash, and monitor the device output.
If you have not yet installed ESP-IDF, please go to Installation and follow the instruction in order to get all the software needed to use this guide.
Start a Project
The ESP-IDF build system does not support spaces in the paths to either ESP-IDF or to projects.
Copy the project get-started/hello_world to
cd %userprofile%\esp xcopy /e /i %IDF_PATH%\examples\get-started\hello_world hello_world
There is a range of example projects in the examples directory in ESP-IDF. You can copy any project in the same way as presented above and run it. It is also possible to build examples in-place without copying them first.
Connect Your Device
Now connect your ESP32-S2 board to the computer and check under which serial port the board is visible.
Serial port names start with
COM in Windows.
If you are not sure how to check the serial port name, please refer to Establish Serial Connection with ESP32-S2 for full details.
Keep the port name handy as you will need it in the next steps.
Configure Your Project
Navigate to your
hello_world directory, set ESP32-S2 as the target, and run the project configuration utility
cd %userprofile%\esp\hello_world idf.py set-target esp32s2 idf.py menuconfig
After opening a new project, you should first set the target with
idf.py set-target esp32s2. Note that existing builds and configurations in the project, if any, will be cleared and initialized in this process. The target may be saved in the environment variable to skip this step at all. See Select the Target Chip: set-target for additional information.
If the previous steps have been done correctly, the following menu appears:
You are using this menu to set up project specific variables, e.g., Wi-Fi network name and password, the processor speed, etc. Setting up the project with menuconfig may be skipped for “hello_word”, since this example runs with default configuration.
The colors of the menu could be different in your terminal. You can change the appearance with the option
--style. Please run
idf.py menuconfig --help for further information.
Build the Project
Build the project by running:
This command will compile the application and all ESP-IDF components, then it will generate the bootloader, partition table, and application binaries.
$ idf.py build Running cmake in directory /path/to/hello_world/build Executing "cmake -G Ninja --warn-uninitialized /path/to/hello_world"... Warn about uninitialized values. -- Found Git: /usr/bin/git (found version "2.17.0") -- Building empty aws_iot component due to configuration -- Component names: ... -- Component paths: ... ... (more lines of build system output) [527/527] Generating hello_world.bin esptool.py v2.3.1 Project build complete. To flash, run this command: ../../../components/esptool_py/esptool/esptool.py -p (PORT) -b 921600 write_flash --flash_mode dio --flash_size detect --flash_freq 40m 0x10000 build/hello_world.bin build 0x1000 build/bootloader/bootloader.bin 0x8000 build/partition_table/partition-table.bin or run 'idf.py -p PORT flash'
If there are no errors, the build will finish by generating the firmware binary .bin files.
Flash onto the Device
Flash the binaries that you just built (bootloader.bin, partition-table.bin and hello_world.bin) onto your ESP32-S2 board by running:
idf.py -p PORT [-b BAUD] flash
Replace PORT with your ESP32-S2 board’s serial port name.
You can also change the flasher baud rate by replacing BAUD with the baud rate you need. The default baud rate is
For more information on idf.py arguments, see idf.py.
flash automatically builds and flashes the project, so running
idf.py build is not necessary.
Encountered Issues While Flashing?
If you run the given command and see errors such as “Failed to connect”, there might be several reasons for this. One of the reasons might be issues encountered by
esptool.py, the utility that is called by the build system to reset the chip, interact with the ROM bootloader, and flash firmware. One simple solution to try is manual reset described below, and if it does not help you can find more details about possible issues in Troubleshooting.
esptool.py resets ESP32-S2 automatically by asserting DTR and RTS control lines of the USB to serial converter chip, i.e., FTDI or CP210x (for more information, see Establish Serial Connection with ESP32-S2). The DTR and RTS control lines are in turn connected to
CHIP_PU (EN) pins of ESP32-S2, thus changes in the voltage levels of DTR and RTS will boot ESP32-S2 into Firmware Download mode. As an example, check the schematic for the ESP32 DevKitC development board.
In general, you should have no problems with the official esp-idf development boards. However,
esptool.py is not able to reset your hardware automatically in the following cases:
Your hardware does not have the DTR and RTS lines connected to
The DTR and RTS lines are configured differently
There are no such serial control lines at all
Depending on the kind of hardware you have, it may also be possible to manually put your ESP32-S2 board into Firmware Download mode (reset).
For development boards produced by Espressif, this information can be found in the respective getting started guides or user guides. For example, to manually reset an ESP-IDF development board, hold down the Boot button (
GPIO0) and press the EN button (
For other types of hardware, try pulling
When flashing, you will see the output log similar to the following:
... esptool.py --chip esp32s2 -p /dev/ttyUSB0 -b 460800 --before=default_reset --after=hard_reset write_flash --flash_mode dio --flash_freq 40m --flash_size 2MB 0x8000 partition_table/partition-table.bin 0x1000 bootloader/bootloader.bin 0x10000 hello_world.bin esptool.py v3.0-dev Serial port /dev/ttyUSB0 Connecting.... Chip is ESP32-S2 Features: WiFi Crystal is 40MHz MAC: 18:fe:34:72:50:e3 Uploading stub... Running stub... Stub running... Changing baud rate to 460800 Changed. Configuring flash size... Compressed 3072 bytes to 103... Writing at 0x00008000... (100 %) Wrote 3072 bytes (103 compressed) at 0x00008000 in 0.0 seconds (effective 3851.6 kbit/s)... Hash of data verified. Compressed 22592 bytes to 13483... Writing at 0x00001000... (100 %) Wrote 22592 bytes (13483 compressed) at 0x00001000 in 0.3 seconds (effective 595.1 kbit/s)... Hash of data verified. Compressed 140048 bytes to 70298... Writing at 0x00010000... (20 %) Writing at 0x00014000... (40 %) Writing at 0x00018000... (60 %) Writing at 0x0001c000... (80 %) Writing at 0x00020000... (100 %) Wrote 140048 bytes (70298 compressed) at 0x00010000 in 1.7 seconds (effective 662.5 kbit/s)... Hash of data verified. Leaving... Hard resetting via RTS pin... Done
If there are no issues by the end of the flash process, the board will reboot and start up the “hello_world” application.
Monitor the Output
To check if “hello_world” is indeed running, type
idf.py -p PORT monitor (Do not forget to replace PORT with your serial port name).
This command launches the IDF Monitor application:
$ idf.py -p <PORT> monitor Running idf_monitor in directory [...]/esp/hello_world/build Executing "python [...]/esp-idf/tools/idf_monitor.py -b 115200 [...]/esp/hello_world/build/hello_world.elf"... --- idf_monitor on <PORT> 115200 --- --- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H --- ets Jun 8 2016 00:22:57 rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) ets Jun 8 2016 00:22:57 ...
After startup and diagnostic logs scroll up, you should see “Hello world!” printed out by the application.
... Hello world! Restarting in 10 seconds... This is esp32s2 chip with 1 CPU core(s), WiFi, silicon revision 0, 2MB external flash Minimum free heap size: 253900 bytes Restarting in 9 seconds... Restarting in 8 seconds... Restarting in 7 seconds...
To exit IDF monitor use the shortcut
You can combine building, flashing and monitoring into one step by running:
idf.py -p PORT flash monitor
IDF Monitor for handy shortcuts and more details on using IDF monitor.
idf.py for a full reference of
idf.pycommands and options.
That’s all that you need to get started with ESP32-S2!
Now you are ready to try some other examples, or go straight to developing your own applications.
Some of examples do not support ESP32-S2 because required hardware is not included in ESP32-S2 so it cannot be supported.
If building an example, please check the README file for the
Supported Targets table. If this is present including ESP32-S2 target, or the table does not exist at all, the example will work on ESP32-S2.
Permission issues /dev/ttyUSB0
With some Linux distributions, you may get the
Failed to open port /dev/ttyUSB0 error message when flashing the ESP32-S2. This can be solved by adding the current user to the dialout group.