Flash ESP-AT Firmware from microcontroller

[michael98]

Hello,

I am currently trying to flash ESP-AT firmware on the ESP32-WROOM-32D chip from an atmel microcontroller via UART.
I was only able to flash the firmware using the ESP python flash tool by connecting the atmel chip with USB to a PC and forward the data send by the esptool over UART directly to the ESP.

Now I want to flash the ESP-AT firmware without using ESPtool but flash it directly from a microcontroller.
Does somebody know where I can find documentation about protocol to communicate with the ESP bootloader and documentation about how the ESP flash tool works.

Thank you!

[ESP_Sprite]

https://github.com/espressif/esp-serial-flasher/

[michael98]

Cool, I will look into that. Thank you!