TinyUSB is an open-source cross-platform USB Host and Device stack for embedded systems.
The project addresses the challenge of implementing USB functionality on resource-constrained microcontrollers. It solves this by providing a memory-safe stack that uses no dynamic allocation and keeps all buffers static, combined with thread-safe interrupt handling that defers USB interrupts to non-ISR task functions. This design prioritizes real-time performance and safety in embedded environments where these constraints matter.
The tool suits developers building USB-connected embedded devices who need to support multiple MCU families without rewriting USB code. It works across more than fifty microcontroller families and integrates with bare metal systems as well as real-time operating systems including FreeRTOS, RT-Thread, and Mynewt. The stack includes support for CDC, HID, MSC, Audio, and Host-mode USB, making it applicable to a wide range of device types from simple serial interfaces to mass storage and human interface devices. The project provides example implementations and board support files for common development boards to accelerate getting started.
Development activity shows consistent engagement with the community through GitHub Discussions as the primary forum for questions and advice. The project maintains active issue tracking with templates to guide bug reports and feature requests. Testing infrastructure includes unit tests, fuzzing, and hardware testing to validate functionality across supported platforms. Documentation is actively maintained with online guides covering getting started, implementation details, and porting procedures for adding new MCU and board support.
