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COMPUTER ACCESS TECHNOLOGY CORPORATION USB REQUEST DEFINITION (.REQ) FILES

Reference Manual

USB REQUEST DEFINITION (.req)

ILES

Request definition (.req) files are used to configure decoding of class- or vendor-

specific data of any protocol defined for USB. A .req file is a set of instructions that

contains definitions that describe, in USB-specific terms, how to take blocks of data

and break them into fields with consecutive decoding of each field. The data being

decoded can be data in a USB Device Request, or any formatted data that is sent on

an Interrupt or Bulk endpoint of a USB device.

The request definition files are text-based files that are identifiable by their .req ex-

tension. Customized decoding of USB requests is possible by editing files or

creating new definition files. This document describes the components of a .req file

and the format for writing or editing a .req file.

Please refer to the Universal Serial Bus Specification, version 1.1 for details about

USB protocol. The USB specification is available from the USB Implementers

Forum (USB-IF) at http://www.usb.org/.

Structure

A .req file has the following basic structure:

[Defines=

{

<Define_0>=<Define_Name_0>

<Define_1>=<Define_Name_1>

<Define_2>=<Define_Name_2>

...

}]

opt

GroupName=<name>

GroupType=<Standard, Class, or Vendor>

AllRequests=

{

<bRequest_0>=<bRequest_Name_0>

<bRequest_1>=<bRequest_Name_1>

<bRequest_2>=<bRequest_Name_2>

...

}

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