UM0851 datasheet(70/245 Pages) STMICROELECTRONICS

Part #	UM0851

Description	SPEAr is a family of highly customizable ARM-based embedded

PDF	245 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

70 / 245 page

Communication device drivers

UM0851

70/245

Doc ID 16604 Rev 2

Figure 15.

USBD interface

4.4.2

Software overview

There is wide variety of USB Devices available in the market. General examples of these

devices are USB Ethernet adapters, USB audio devices, USB mass storage devices, USB

printers etc. In the Linux USB world, these functions are called gadgets. You can use SPEAr

USBD to build any of these functions. You can also build a device with multiple functions.

Multi-functional printers, USB Ethernet plus mass storage are such examples. These

devices are generally known as composite devices.

The USB Device controller driver in SPEAr LSP supports Linux USB gadget framework.

This framework provides a flexible and easy interface for adding different USB slave

devices. It also offers the facility to easily add multi-function USB composite devices.

The following figure explains the USB gadget framework.

UM0851 Datasheet(PDF) 70 Page - STMicroelectronics