USB stack for embedded devices in Rust.

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 driver to implement the USB device.

The UsbClass trait can be used to implement 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.

• atsam4 - device-driver implementation for atsam4e & atsam4s microcontrollers (UDP). Examples can be found here. While not expressly supported with this crate, atsam3s and atsam55g could also be supported with a similar code-base.

• 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.

• musb - device-driver implementation for musb (Mentor USB, USB2.0 IP), widely used in various microcontrollers and SoCs from vendors like TI, MediaTek, Puya, and Allwinner. Examples can be found in py32-hal.

• rp2040-hal - device-driver implementation for the raspberry pi RP2040 microcontroller. Examples can be found in the various boards crates here.

• stm32-usbd - device-driver implementation for multiple STM32 microcontroller families. Examples can be found in each individual HAL crate that implements the USB peripheral.

• usbd-hid - HID class
• usbd-human-interface-device - HID class
• usbd-serial - CDC-ACM serial port class
• usbd-storage - (Experimental) Mass storage port class
• usbd-dfu - Device Firmware Upgrade class
• usbd-picotool-reset - picotool-reset class
• usbd-midi - MIDI class
• usbd-audio - (Experimental) Audio class

Other implementations for USB in Rust

• The Embassy project has an async USB stack, embassy-usb.