USB Host example

[romainreignier]

It would be nice to have an example showing the usage of the USB Host feature on the ESP32-S2 and ESP32-S3.

From my understanding, the low level USB controller is supported but it seems that the usb_host traits are not implemented and I could not find any example using the USB Host feature.

For my use case I would like to connect a USB cdc_acm device, as done in this example from the esp-idf: https://github.com/espressif/esp-idf/tree/56123c52aaa08f1b53350c7af30c91320b352ef4/examples/peripherals/usb/host/cdc/cdc_acm_host

Thanks

[bjoernQ]

We don't have support for USB host, yet. The big show-stopper here is that the Rust ecosystem has USB device support (via https://crates.io/crates/usb-device) but I haven't seen a suitable USB host implementation (but maybe/hopefully I missed something and there is such a thing out there)

[paulyoung]

I’ve been documenting my findings at rust-embedded/wg#40 (comment) and rust-embedded/wg#40 (comment)

[paulyoung]

I came across https://github.com/nilclass/usbh and opened an issue to discuss ESP32 support nilclass/usbh#2

Help appreciated!

[romainreignier]

Ok, I see, thank you.
So lets wait for a Rust implementation.

[ria8651]

Just wanted to point out cotton-usb-host and embassy-usb. It would be great to have usb host support in esp-hal.

[bugadani]

esp-hal has embassy-usb support, so hopefully we'll just be able to magically be able to work with the linked PR