Neither ESP8266 nor ESP32 support USB, so what am I babbling about? No, ESP8622 did not suddenly grow a USB PHY, but cnlohr decided to implement virtual USB support using two GPIOs (12 & 13) for the D+/D- USB signals, meaning you can connect any ESP8266 module through USB, or even update the firmware through USB without external hardware, apart from a single extra resistor.
The source code is available on espusb repo on github. Please note that the code is currently work in progress, and USB implementation currently only works at 1.5 Mbit/s, with potentially future support for 12 Mbit/s.
That’s the demo, and an explanation about the design process.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.
That is awesome work! Well done!
LUFA and V-USB seem like good places to start if implementing a usb software stack!
http://www.fourwalledcubicle.com/files/LUFA/Doc/120219/html/_page__alternative_stacks.html
Hopefully he was able to leverage something from that!
Redirecting/mirroring the serial console through USB should be easy.
Nice, thanks!
He has even made a tiny ESP8285 board specifically for ESPUSB -> https://twitter.com/cnlohr/status/770674584626475009