Hello everyone interested in USB HUBs! First of all, I'm sorry for the misinformation about the beta branch. After internal discussion we decided to wait and provide a stable HUB support. This is now available in esp-idf master branch! Since ESPs are embedded systems there are some notable limitatio...

Hi, The USB HID protocol offers 2 interfaces 1. BOOT protocol: simple and easy protocols for keyboards. Does not support media keyds 2. HID custom protocol: You must define the additional (media) HID reports yourself, but you can send all kind of reports Here is a nice thread, where users tried to i...

Hi, I'm not proficient with Micropython, but from a quick look to their docs, they don't seem to have USB Host support implemented. USB is not peer-to-peer communication. There always is a Host and a Device. In your case, the ESP32 boards are USB devices and RPi is USB Host. The USB feature is not i...

@mistermiser42 were you able to figure it out? I am trying to connect a 3d printer to ESP- S3 and wondering can I use the USB host mode for that

Let's discuss this in a separate issue:
https://github.com/espressif/esp-idf/issues/13160

Here's a link to USB device CDC example and an exact line that sends data to USB Host (PC):
https://github.com/espressif/esp-idf/bl ... main.c#L33

Hi, ESP32-S3 has 3 UARTs and 1 USB-OTG peripheral. So this is possible, but you must be very careful in you HW design: Usually, ESP32-S3 devkits use UART0 as their main programming and logging interface. If you want to use UART0 in your application, you must 1. disable this feature in menuconfig (fo...

Would it be possible for application layer to make decision for which endpoint we need to allocate HW channels and which can be skipped? This at least could partially solve the issue with lack of channels. This is how it works now! Upon device connection only EP0 is allocated, which must be present...

You mean only 8 endpoints can have scheduled IN/OUT transactions inside one 1 ms frame? Yes, this is a HW limitation. Each active endpoint must have a HW implementation (channel). There are 8 such implementations (channels) in ESP32-S2/S3. Or is this some enumeration limit, i.e. 3rd HID device may ...

Hi, The USB VBUS monitoring is only relevant for self-powered devices, that is devices that can operate even when there is no USB connection. The consequence of NOT monitoring the VBUS, is that the device's software won't be able to distinguish between USB Suspend and USB disconnection. Suspend mean...

Hi everyone, Here's an update about this topic, that should answer all questions mentioned here. Espressif's USB Host implementation is fully open-source. The only non-public part is the USB peripheral itself (that is 3rd party Synopsys DWC). The HUB feature must be implemented in esp-idf (open sour...