Initial flash needed for download boot over internal USB?

[Fundeckhermit]

I want to design a minimal PCB around the ESP32-S2-MINI with just:

• Crystal circuit
• Boot/Reset button
• USB connector directly on D+ and D-
• Voltage regulator

Can I use IDF to download a fresh/new/empty ESP32-S2-MINI with just the internal USB?

OR do I need JTAG/UART for the initial flashing?

[ESP_Sprite]

Yes, you can; the ROM contains a driver that can flash the device over USB. You do need a way to be able to put it into download mode by grounding GPIO0, though.

[Fundeckhermit]

So this would work?

Flashing a binary file with IDF on a new/fresh/empty ESP32-S2 over the internal USB (USB-OTG) peripheral.

[ESP_Sprite]

Yes, given that you put the chip into download mode by starting with GPIO0 low.

[don.vukovic]

Is there a page that describes this functionality ?

Are there example code available ?

[ESP_Sprite]

I'm not sure if there's a page describing this aside from mentions that you can also flash over USB here and there.What code example would you need? The USB port exposes an industry-standard CDC-ACM serial port (over which you can use the same protocol as when you use UART) and DFU endpoints.