ESP32-S2 Beta Preview Support¶
The current master branch of ESP-IDF (pre-V4.1) contains preview support for ESP32-S2 Beta.
The ESP32-S2 Beta chip is not the same as the final ESP32-S2, the Beta chip is a limited engineering sample and as a result not all features are available.
Except where it specifically mentions ESP32-S2, this version of the ESP-IDF Programming Guide is written for ESP32 only. Most software APIs and components are the same or very similar for ESP32-S2, but differences may not be documented yet.
Setting up for ESP32-S2 Beta¶
To start with, follow the 快速入门 guide to configure the CMake-based build system for ESP32.
install.bat as part of the Get Started guide, the ESP32-S2 toolchain will be automatically downloaded and added to the IDF Tools directory. If you had already run
install.bat before updating to a version with ESP32-S2 support, you may need to re-run it.
The toolchain tuple is xtensa-esp32s2-elf-, for example the GCC compiler for this target is named xtensa-esp32s2-elf-gcc.
Building a project for ESP32-S2 Beta¶
Not all ESP-IDF examples support ESP32-S2 Beta.
For some examples this is because required hardware is not included in ESP32-S2 so it cannot be supported. For some examples this is because the example has not yet been updated for ESP32-S2.
If building an example, please check the example CMakeLists.txt file for the clause
SUPPORTED_TARGETS esp32. If this is present, the example won’t work on ESP32-S2.
Before building an ESP-IDF project, run the following command to switch the target to ESP32-S2 Beta:
idf.py set-target esp32s2beta
set-target will clear the project configuration and create a new empty
sdkconfig file for the project. The old configuration will be saved in
Then configure the project:
There are 3 versions of ESP32-S2 Beta engineering sample available with different Wi-Fi PHYs. They can be identified by the marking on the chip itself. The project must be configured to match the chip via the project setting “ESP32-S2 Beta chip version” (
CONFIG_ESP32S2_BETA_CHIP_VERSION). This can be found under Component Config -> ESP32S2-specific. If the project setting doesn’t match the chip then Wi-Fi performance may be very poor, or the chip may crash when initializing Wi-Fi.
Build and flash the project as usual, for example:
idf.py -p PORT flash monitor
Consult the 快速入门 guide for more details on building and flashing an ESP-IDF project.
It is possible to set the project target back to ESP32 by running
idf.py set-target esp32. This also clears the project configuration.
ESP32-S2 Beta support is currently a preview and does not support all features. Espressif firmware developers are working hard on the remaining support, so please update the
master branch regularly to receive the latest code.
- The integrated USB OTG peripheral is not supported
- Documentation not updated for ESP32-S2 in most places
- Peripheral drivers are a work in progress
- No power saving modes
- No hardware security features or cryptographic accelerator support
- Time-of-Flight (TOF) measurements with normal Wi-Fi packets is not supported
- ESP-IDF V4.1 will support ESP32-S2 Beta chip as a preview with some limitations.
- ESP-IDF V4.2 will support ESP32-S2.
Support for ESP32-S2 Beta will be removed from ESP-IDF once ESP32-S2 is available.