EspTinyUSB VS tinyusb

Picked up a LilyGO T-Dongle (ESP32-S2) and going through their github (https://github.com/Xinyuan-LilyGO/T-Dongle-ESP32S2), they only have an example for reading the NAND over USB, via MSC. Has anyone been able to get the SD accessible for read and write in device mode on this or any other ESP32-S2 board? Tried using chegewara's EspTinyUSB, but couldn't get the device to appear in OTG mode.

In Arduino I have the ESP32TinyUSB library, and the board is set to ESP32 Dev Module. I am attempting to build the sketch in the examples for the library at EspTinyUSB/mouse.ino at master · chegewara/EspTinyUSB (github.com) .

The USB OTG pins CANNOT be remapped, which is one of the few functions that can't. Here's the library I use: https://github.com/chegewara/EspTinyUSB

I've been using this: https://github.com/chegewara/EspTinyUSB with the S3, though it was made for the S2. It is for Arduino.

I'd prefer to get the USB working first, and I've been using this project: https://github.com/chegewara/EspTinyUSB to try to get a sign life out of the thing.

You might be in luck because there is an example here. https://github.com/chegewara/EspTinyUSB/tree/master/examples/device/midi

Thanks for your reply. I see there is an active github discussion about USB support in the Arduino IDE, so I guess it is very new/cutting edge. I really like the look of /u/seonr's boards at Adafruit but I also hope we'll see some small/cheap/"pro" boards like the Arduino Pro Micro clones since it feels like this is what the S2 was designed for.

Implementing the required USB host interface is another hurdle, but tinyusb seems to have sorted most of that out, except that UAC2 is implemented as a device while you need a host.

Have a look at TinyUSB. It supports the STM32WB and demo programs for the Nucleo-WB55RG. It even offers an example for dual CDC ports, so very close to what you're looking for.

Second: Distrust, misunderstanding, and out of date opinions of C++ in embedded spaces. I often see "compatibilty" thrown around as a goal for using C and not C++, but for most modern embedded systems, C++ compilers exist and are (usually) well tuned. Arm is a shining example here*. C++ is more optimizable than C as the intent can be clearer to the compiler. C++ constexpr and templates are a godsend for embedded systems, and I used both heavily in my recent arduino and pico testing. I combined both of them for a really cool experimental USB interface descriptor builder that runs at compile time and avoids the need to count byte sizes, but I gave up on it when the maintainer said C only, despite the fact that C can't do that. I was similarly disappointed when the pico "C++" was C only, as there was no backwards compatibility necessary.

I looked at this but the fork seems to have had a lot of problems from looking at the PR: https://github.com/hathach/tinyusb/pull/1219

I think a better solution might be to use a USB flash drive in the usbc port. Unfortunately micropython and circuitpython don't support this (yet), so you'd have to use c++ https://github.com/hathach/tinyusb

It's possible to make the s3 be a mass storage device via TinyUSB. https://github.com/hathach/tinyusb/tree/master/examples/device/cdc_msc_freertos