ESP32-S2 is a highly integrated, low-power, single-core Wi-Fi Microcontroller SoC, designed to be secure and cost-effective, with a high performance and a rich set of IO capabilities. 1
The features include the following:
RSA-3072-based secure boot
AES-XTS-256-based flash encryption
Protected private key and device secrets from software access
Cryptographic accelerators for enhanced performance
Protection against physical fault injection attacks
43x programmable GPIOs
14x configurable capacitive touch GPIOs
LED PWM with up to 8 channels
Espressif HAL requires binary blobs in order work. The west extension below performs the required syncronization to clone, checkout and pull the submodules:
west espressif update
It is recommended running the command above after
Building & Flashing
# From the root of the zephyr repository west build -b esp32s2_saola samples/hello_world
flash target will work with the
configuration. Here is an example for the Hello World
# From the root of the zephyr repository west build -b esp32s2_saola samples/hello_world west flash
Open the serial monitor using the following command:
west espressif monitor
After the board has automatically reset and booted, you should see the following message in the monitor:
***** Booting Zephyr OS vx.x.x-xxx-gxxxxxxxxxxxx ***** Hello World! esp32s2_saola
As with much custom hardware, the ESP32S2 modules require patches to OpenOCD that are not upstreamed. Espressif maintains their own fork of the project. The custom OpenOCD can be obtained by running the following extension:
west espressif install
By default, the OpenOCD will be downloaded and installed under $HOME/.espressif/tools/zephyr directory (%USERPROFILE%/.espressif/tools/zephyr on Windows).
The Zephyr SDK uses a bundled version of OpenOCD by default. You can overwrite that behavior by adding the
parameter when building.
Here is an example for building the Hello World application.
# From the root of the zephyr repository west build -b esp32s2_saola samples/hello_world -- -DOPENOCD=<path/to/bin/openocd> -DOPENOCD_DEFAULT_PATH=<path/to/openocd/share/openocd/scripts> west flash
You can debug an application in the usual way. Here is an example for the Hello World application.
# From the root of the zephyr repository west build -b esp32s2_saola samples/hello_world west debug