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.

• 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 - device-driver implementation for samd21 & samd51 microcontrollers. An example for the itsybitsy_m4 board from Adafruit can be found here.

• 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.

• usbd-serial - CDC-ACM serial port class
• usbd-hid - HID class