lufa VS Adafruit_TinyUSB_Arduino

* QMK Toolbox 0.2.2 (https://qmk.fm/toolbox)* Supported bootloaders:* - ARM DFU (APM32, Kiibohd, STM32, STM32duino) via dfu-util (http://dfu-util.sourceforge.net/)* - Atmel/LUFA/QMK DFU via dfu-programmer (http://dfu-programmer.github.io/)* - Atmel SAM-BA (Massdrop) via Massdrop Loader (https://github.com/massdrop/mdloader)* - BootloadHID (Atmel, PS2AVRGB) via bootloadHID (https://www.obdev.at/products/vusb/bootloadhid.html)* - Caterina (Arduino, Pro Micro) via avrdude (http://nongnu.org/avrdude/)* - HalfKay (Teensy, Ergodox EZ) via Teensy Loader (https://pjrc.com/teensy/loader_cli.html)* - LUFA/QMK HID via hid_bootloader_cli (https://github.com/abcminiuser/lufa)* - LUFA Mass Storage* Supported ISP flashers:* - AVRISP (Arduino ISP)* - USBasp (AVR ISP)* - USBTiny (AVR Pocket)* Auto-flash enabled* Auto-flash disabled* Auto-flash enabledUSB device disconnected (CH341SER_A64): wch.cn USB-SERIAL CH340 (COM15) (1A86:7523:0264)USB device connected (CH341SER_A64): wch.cn USB-SERIAL CH340 (COM15) (1A86:7523:0264)

I briefly checked its code - wrapping it for reasonably convenient use with Arduino IDE would be not that simple. USB is quite abstract protocol and a particular device type requires a matching handler code. You can find example for keyboard HID here: https://github.com/abcminiuser/lufa/tree/master/Demos/Device/ClassDriver/Keyboard - as you can see, there is not so small amount of code for handling it: even though all really hard work is done inside the library, you still need to make a lot of proper calls to make it work.

For AVR devices I've always liked LUFA because it has tons of examples to get you started and works great even on low-end devices like the AT90USB162 (16MHz 8-bit cpu with 512 bytes of SRAM).

https://gitlab.com/baiyibai/pico-w-usb-host-mqtt-numpad

https://github.com/adafruit/Adafruit_TinyUSB_Arduino

My implementation plugs in much higher into the stack and doesn't read the full USB bit mask output, which indicates how many keys are pressed/released.

From my limited understand ing, it should be possible to pass these USB messages from HID client to HID host and vice-versa. Then it's only a matter of sending this information over a TCP/UDP interface. However, from my research, it seems the TinyUSB library doesn't provide the full bitmask resolution necessary for all devices. The YouTuber Wendell from LevelOneTechs has also talked about the troubles of getting some devices working with his KVM products, so it may not be as simple as I'm suggesting here.

Overall though, a $15/endpoint is very attractive.

I'm curious about this restriction to ESP32-S series as shown here: https://docs.tinyusb.org/en/latest/reference/supported.html . This article https://www.pschatzmann.ch/home/2021/02/19/tinyusb-a-simple-tutorial/ claims that "Most Microcontrollers have a built in Serial USB functionality that can not be changed (e.g. ESP32, ESP8266". OTOH, https://github.com/adafruit/Adafruit_TinyUSB_Arduino indicates that all ESP32 chips are supported.

Well theorically any Arduino with a native USB connection (Atmega32u4, SAMD21, STM32, ESP32, Raspberry Pico...) would be able to do that, the difficult part is mostly finding a good library that can do that if you're not an ultra expert programmer. Here is an example, this one can support SAMD, ESP32 and Pico for instance (be careful you need specific cores to make it run). Here is an example how to use it

I have the Adafruit ESP32-S2 TFT board, and I am trying to read in a USB peripheral on my ESP board. I thought this was going to be an easy task and I am quite overwhelmed. I was hoping I could stay in the circuitpython ecosystem, but it seems like making the ESP32 a USBhost is not supported yet. My next level of comfort would be in the arduino ecosystem using https://github.com/adafruit/Adafruit_TinyUSB_Arduino. I believe this will do what I want, but I am having difficulty porting it into the Arduino core. Has anybody here done this successfully? I'm specifically stuck on #2:

Alternatively, go up a level and use Arduino and the Arduino TinyUSB wrapper library. This is also in active development with many recent MIDI fixes.

This is what you want https://github.com/adafruit/Adafruit_TinyUSB_Arduino There are examples for various USB device types.