New USB Device Class API Introduction
summary
A new USB device stack in Zephyr (since 3.3.0) provides a mandatory common API for class implementations, supports runtime add/remove of class instances, and already has three UDC drivers plus three class ports (CDC ACM/ECM, Bluetooth HCI, mass storage) with porting claimed complete. The API specifies init/enable/shutdown handlers, separate control-in/control-out handlers, a single transfer-completion callback, device-instance and configuration management, shell and virtual-host tools for testing, and remaining work on transfer abstractions and OS/BOS descriptor support.
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chapters (14)
- 0:00Introduction and overview
- 1:00Current architecture status
- 2:54USB device functional design
- 5:00Descriptors and configuration
- 7:54Device and application setup
- 10:53Initialization and lifecycle
- 13:27Development and shell support
- 14:46Class API requirements
- 17:19Instantiation approaches
- 20:28Handling class events
- 24:05Control requests and vendor
- 27:02Transfer completions
- 30:04Debugging and future work
- 32:24Demo and closing discussion
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