Microchip MCP2155 Handleiding

Microchip Niet gecategoriseerd MCP2155

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AN941

INTRODUCTION

This application note details the tools, supporting

technologies and procedures for the development of

infrared applications on Windows XP® based PC.

A Windows XP (WinXP) application that interfaces with

an embedded system via IrCOMM is included in the

appendices of this application note. This source code

demonstrates the use of the Windows® Application

Programming Interface (API) required for IrDA®

standard IR communication on Windows XP based

platforms.

Appendix A: “Example Irda® Standard System

Description” describes the system and documents the

tool used to create this Windows XP application

program, while Appendix B: “Win XP Source Code -

IrDA DEMO.CPP” through Appendix C: “WinXP

Source Code - IrDA DemoDlg.cpp” is the WinXP

Application Program source code.

FIGURE 1 shows an IrDA standard system, where a

Windows XP based PC is communicating with an

embedded system. In this system, the PC operates as

the Primary device (Client) and the embedded system

operates as the Secondary device (Server). The terms

Client and Server are used in reference to Windows

(PC) programming, while Primary device and

Secondary device are terms used by the IrDA

standard.

FIGURE 1: WINDOWS XP - EMBEDDED SYSTEM BLOCK DIAGRAM

Author: Joseph Snyder, Microchip Technology Inc.

Frank Ableson, Unwired Tools, LLC

Windows® XP PC

with IrDA® Standard Port

Embedded System with IrDA® Standard Port

MCP215X Optical

Transceiver

Circuitry

Host Controller

and Embedded

Circuitry

MCP2140

(Secondary Device/Server)

(Primary Device/Client)

Programming Windows XP®

for Embedded IR Applications

AN941

Terminology

Below is a list of useful terms and their definitions:

•Microsoft® Foundation Class (MFC): Class

library and framework for application development

on Windows based platforms.

•Microsoft Visual Studio® .NET: Development

environment for the development of Windows

desktop applications using Visual C++®, Visual

Basic®, Visual C#® and the .NET framework.

Available for purchase from Microsoft’s web site

at www.microsoft.com.

• Microsoft Software Development Kit (SDK):

Documentation, samples, header files, libraries

and tools needed to develop applications that run

on the Windows operating system.

•Primary Device: The IrDA standard device that

queries for other devices.

•Secondary Device: The IrDA standard device

that waits to detect IR communication before

performing any IR communication.

•Host Controller: The controller in the embedded

system that communicates to the MCP215X or

MCP2140.

•MCP215X: An IrCOMM protocol handler IC that

supports IR communication from 9600 baud to

115,200 baud.

•MCP2140: A low-cost IrCOMM protocol handler

IC that supports IR communication at 9600 baud.

•Protocol Stack: A set of network protocol layers

that work together. Figure 2 shows the IrDA

standard protocol stack.

•IrCOMM (9-wire “cooked” service class): IrDA

standard specification for the protocol to replace

the serial cable (using flow control).

FIGURE 2: IrDA® STANDARD DATA -

PROTOCOL STACKS

IrTran-P IrObex IrLan IrComm (1) IrMC

LM-IAS Tiny Transport Protocol (Tiny TP)

IR Link Management - Mux (IrLMP)

IR Link Access Protocol (IrLAP)

Asynchronous

Serial IR (2, 3)

(9600 -115200 b/s)

Serial IR

(1.152 Mb/s)

Synchronous

4 PPM

(4 Mb/s)

Synchronous

Note 1: The MCP215X and MCP2140

implement the 9-wire “cooked” service

class serial replicator.

2: An optical transceiver is required.

3: The MCP2140 support 9600 baud IR

communication only.

Supported by

the MCP215X

and MCP2140.

Optional IrDA® standard

data protocols not

supported by the MCP215X

and MCP2140.

AN941

INFRARED COMMUNICATIONS

The application built and discussed in this application

note uses a high-level, infrared protocol called

IrCOMM. This protocol is designed to be a wire-

replacement technology. Infrared technology is an

excellent choice for data collection for many reasons,

including:

• Availability: Virtually every late-model PDA and

laptop contains an IrDA standard port.

• Cost: IrDA standard communications may be

added to a custom design very economically, as

demonstrated in this application note.

• Convenience and compatibility: Working without

wires means no cables, gender-changers or any

other gadgets that allow two devices to

communicate. This is vital to the frequent traveler

or technician in the field.

For more information regarding the IrComm protocol,

visit the IrDA organization’s web site at:

http://www.irda.org.

WINDOWS XP DEVELOPMENT

Visual Studio .NET is available from Microsoft for the

development of Windows based applications. With

Visual Studio .NET, the developer can create applica-

tions using Microsoft's familiar API's (Win32®, ATL,

MFC, .NET Compact Framework).

Windows XP Tools

Microsoft’s Visual Studio .NET offers a wide range of

development choices, including the Visual C++, Visual

Basic and Visual C# programming languages. This

application note focuses on development of IrDA

standard applications using Microsoft's Visual Studio

.NET using C++.

While this project is Visual Studio 2003 compatible, it is

actually “WIN32” code, not “managed” .NET code. The

source code in this project will build in any MFC aware

environment including Visual Studio 6.X, Visual Studio

2003, and Visual Studio 2005.

Note: The sample application created in this

Application Note is a Microsoft Foundation

Class (MFC) C++ application which relies

heavily on the characteristics of object

oriented programming. Therefore, to get

the most out of this application note’s

examples requires an understanding of

C+ programming. However, it is possible

to employ “C” to perform IrDA program-

ming under the Windows environment. For

examples of non-MFC IrDA programming,

see Appendix I: “MCHP941.C SOURCE

Code”.

Product specificaties

Merk:	Microchip
Categorie:	Niet gecategoriseerd
Model:	MCP2155

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