ESP32-S2
Overview
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
Various peripherals:
43x programmable GPIOs
14x configurable capacitive touch GPIOs
USB OTG
LCD interface
camera interface
SPI
I2S
UART
ADC
DAC
LED PWM with up to 8 channels
System requirements
Prerequisites
Espressif HAL requires WiFi and Bluetooth binary blobs in order work. Run the command below to retrieve those files.
west blobs fetch hal_espressif
Note
It is recommended running the command above after west update.
Building & Flashing
Build and flash applications as usual (see Building an Application and Run an Application for more details).
# From the root of the zephyr repository
west build -b esp32s2_saola samples/hello_world
The usual flash target will work with the esp32s2_saola board
configuration. 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 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
Debugging
As with much custom hardware, the ESP32 modules require patches to OpenOCD that are not upstreamed yet. Espressif maintains their own fork of the project. The custom OpenOCD can be obtained at OpenOCD ESP32
The Zephyr SDK uses a bundled version of OpenOCD by default. You can overwrite that behavior by adding the
-DOPENOCD=<path/to/bin/openocd> -DOPENOCD_DEFAULT_PATH=<path/to/openocd/share/openocd/scripts>
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