usb-device
==========
Experimental device-side USB stack for embedded devices in Rust.
This crate is still under development and should not be considered production ready or even USB
compliant.
The UsbDevice object represents a composite USB device and is the most important object for
application implementors. The UsbDevice combines a number of UsbClasses (either custom ones, or
pre-existing ones provided by other crates) and a UsbBus device drives to implement the USB device.
The UsbClass trait can be used to implemented USB classes such as a HID device or a serial port. An
implementation may also use a custom class if the required functionality isn't covered by a standard
class.
The UsbBus trait is intended to be implemented by device-specific crates to provide a driver for
each device's USB peripheral.
Hardware driver crates
----------------------
* [stm32-usbd](https://github.com/stm32-rs/stm32-usbd) - device-driver implementation for multiple STM32 microcontroller families.
Examples can be found in each individual HAL crate that implements the USB peripheral.
* [atsamd](https://github.com/atsamd-rs/atsamd) - device-driver implementation for samd21 & samd51 microcontrollers. An example for the
itsybitsy_m4 board from Adafruit can be found [here](https://github.com/atsamd-rs/atsamd/blob/master/boards/itsybitsy_m4/examples/usb_serial.rs).
* [imxrt-usbd](https://github.com/imxrt-rs/imxrt-usbd) - device-driver implementation for NXP i.MX RT microcontrollers. Examples for
i.MX RT boards, like the Teensy 4, are maintained with the driver.
Class crates
------------
* [usbd-serial](https://github.com/mvirkkunen/usbd-serial) [](https://crates.io/crates/usbd-serial) - CDC-ACM serial port class
* [usbd-hid](https://github.com/twitchyliquid64/usbd-hid) [](https://crates.io/crates/usbd-hid) - HID class
TODO
----
Features planned but not implemented yet:
- Interface alternate settings
- Multilingual string descriptors
- Isochronous endpoints
Features not planning to support at the moment:
- More than one configuration descriptor (uncommon in practice)