ESP32 Forum

Hi,
I have connected esp32 on my XYZ MCU over SDIO interface and I want to serial upgrade ESP32's Firmware.
Is it possible?

Assuming your ESP32 application can receive some kind of commands from the master over SDIO, you can add several commands for OTA:
- start sending OTA binary
- send one chunk of OTA binary
- end sending OTA binary and perform the update

In the ESP32 application, you can then map these commands to calls to the respective esp_ota_* APIs.