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Chapter 4
4
4-1-3 USB CLASS LAYER
Your application will interface with μC/USB-Device using the class layer API. In this layer,
four classes defined by the USB-IF are implemented. In case you need to implement a
vendor-specific class, a fifth class, the “vendor” class, is available. This class provides
functions for simple communication via endpoints. The classes that μC/USB-Device
currently supports are the following:
■
Communication Device Class (CDC)
■
CDC Abstract Control Model (ACM) subclass
■
Human Interface Device Class (HID)
■
Mass Storage Class (MSC)
■
Personal Healthcare Device Class (PHDC)
■
Vendor Class
You can also create other classes defined by the USB-IF. Refer to Chapter 7, “USB Classes”
on page 99 for more information on how a USB class interacts with the core layer.
4-1-4 USB CORE LAYER
USB core layer is responsible for creating and maintaining the logical structure of a USB
device. The core layer manages the USB configurations, interfaces, alternate interfaces and
allocation of endpoints based on the application or USB classes requirements and the USB
controller endpoints available. Standard requests, bus events (reset, suspend, connect and
disconnect) and enumeration process are also handled by the Core layer.
4-1-5 ENDPOINT MANAGEMENT LAYER
The endpoint management layer is responsible for sending and receiving data using
endpoints. Control, interrupt and bulk transfers are implemented in this layer. This layer
provides synchronous API for control, bulk and interrupt I/O operations and asynchronous
API for bulk and interrupt I/O operations.
56
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