Abbreviations
- APP: User Application
- ASF: Advanced Software Framework
- CBW: Command Block Wrapper (from Mass Storage Class)
- CDC: Communication Device Class
- CSW: Command Status Wrapper (from Mass Storage Class)
- DP or D+ Data Plus Differential Line
- DM or D- Data Minus Differential Line
- FS: USB Full Speed
- HID: Human Interface Device
- HS: USB High Speed
- UDC: USB Device Controller
- UDD: USB Device Descriptor
- UDI: USB Device Interface
- USB: Universal Serial Bus
- MSC: Mass Storage Class
- PHDC: Peripheral Health Device Class
- sleepmgr: Sleep Management Service from ASF
- ZLP: Zero Length Packet