Freescale-semiconductor TWR-MCF52259-Ethenet Manual de usuario descargar pdf (Pagina 101)

Software – General Concepts

How Does the Host Know a Device’s Requirements?

Interface

Descriptor

//------------------------------------------------------------

// Sample Standard Interface Descriptor Type

// Definition Fields

//------------------------------------------------------------

Length (9 bytes)

Descriptor Type (INTERFACE)

Interface Number (interface number, zero based, and

incremented once for each new interface descriptor.)

Alternate Setting (value used to select alternative

setting)

Number of Endpoints (number of Endpoints used for

this interface)

Interface Class (e.g., HID, mass storage))

Interface Sub Class (subclass Code - assigned by

USB Org)

Interface Protocol (Protocol Code assigned by USB

Org)

Index (Index of String Descriptor Describing this

interface)

The interface descriptor groups

endpoints into functional groups

that perform a single feature of

the device.

1 2 ... 96 97 98 99 100 101 102 103 104 105 106 ... 165 166

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Freescale-semiconductor TWR-MCF52259-Ethenet Manual de usuario Pagina 101