this is a template firmware for ESP32-S2-based micro-controller projects.

board

the board used is a WEMOS S2 mini.

compile and flash

the firmware uses ESP-IDF v5.0. See getting started to install the IDF. once installed, load the IDF tools:

get_idf

to build the firmware:

idf.py build

note that the first time it will download additional components (such as tinyUSB and esp_tinyusb).

the firmware supports USB DFU flashing. it is meant to be used along the ESP32-S2 DFU mode firmware. Once the DFU mode firmware is installed (on the factory partition), you can flash this firmware (on the ota0 partition) using dfu-util:

dfu-util --device 1d50:617b --alt 1 --download build/main.bin --reset

if the firmware is stuck, and you can't switch from runtime mode to DFU mode using dfu-util, hold pin 14 high while resetting. this will force booting the DFU mode.

you can also flash using the ESP ROM bootloader (hold GPIO0 low while resetting) and esptool:

esptool.py -p /dev/ttyACM0 --before no_reset --after no_reset --chip esp32s2 write_flash --flash_mode dio --flash_size detect --flash_freq 80m 0x50000 build/main.bin