DV102411 - Microchip Technology

Wi-Fi Comm Demo Board

User’s Guide

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ISBN: 978-1-62076-128-1

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QUALITYMANAGEMENT



YSTEM

CERTIFIEDBYDNV

== ISO/TS16949==

Wi-Fi COMM DEMO BOARD

USER’S GUIDE

Preface ...........................................................................................................................5

Chapter 1. Overview

1.1 Kit Contents .................................................................................................... 9

1.2 Functionality and Features ............................................................................. 9

Chapter 2. Hardware

2.1 Hardware Features .......................................................................................11

Chapter 3. Getting Started

3.1 Overview ......................................................................................................13

3.2 Running the Wi-Fi Comm Demo Application .................................................. 13

3.3 Ad hoc Networks ..........................................................................................16

3.4 Zero Configuration/Bonjour .......................................................................... 16

3.5 Configured vs. Unconfigured State .............................................................. 17

Appendix A. Wi-Fi Comm Demo Board Schematic

A.1 Introduction .................................................................................................. 19

Worldwide Sales and Service ....................................................................................22

Table of Contents

Wi-Fi Comm Demo Board User’s Guide

NOTES:

Wi-Fi COMM DEMO BOARD
USER’S GUIDE
© 2012 Microchip Technology Inc. DS70678A-page 5
Preface
INTRODUCTION 
This chapter contains general information that will be useful to know before using the 
Wi-Fi Comm Demo Board. Items discussed in this chapter include:
•Document Layout
•Conventions Used in this Guide
•Wa rr anty Re gist ra tio n
•Recommended Reading
•The Microchip Web Site
•Development Systems Customer Change Notification Service
•Customer Support
•Document Revision History
DOCUMENT LAYOUT 
This document de scribes how to use the Wi-Fi Comm Demo Boa rd to create a Wi-Fi
network and contro l the demo board  functions from  the client device web  browser. The
manual layout is as follows:
•Chapter 1. “Overview” – This chapter provides a brief overview of the demo
board, highlighting its features and uses.
•Chapter 2. “Hardware” – This chapter provides the hardware description of the
Wi-Fi Comm Demo Board.
•Chapter 3. “Getting S tarted” – This ch ap ter d escrib es what you n eed  to know  to
start u sing the Wi-Fi Comm Demo Board.
•Appendix A. “Wi-Fi Comm Demo Board Schematic” – This appendix includes
Wi-Fi Comm Demo Board schematic.
NOTICE TO CUSTOMERS
All documentation becomes dated, and this manual is no exception. Microchip tools and 
documentation are constantly evolving to meet customer needs, so some actual dialogs 
and/or tool descriptions may differ from those in this document. Please refer to our web site 
(www.microchip.com) to obtain the latest documentation available.
Documents are identified with a “DS” number. This number is located on the bottom of eac h 
page, in front of the page number. The numbering convention for the DS number is 
“DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the 
document.
For the most up-to-date information on development tools, see the MPLAB® IDE on-line help. 
Select the Help menu, and then Topics to open a list of available on-line help files.

Wi-Fi Comm Demo Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB® IDE User’s Guide

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog

A menu selection select Enable Programmer

Quotes A field name in a window or

dialog “Save project before build”

Underlined, italic text with

right angle bracket A menu path File>Save

Bold characters A dialog button Click OK

A tab Click the Power tab

N‘Rnnnn A number in verilog format,

where N is the total number of

digits, R is the radix and n is a

digit.

4‘b0010, 2‘hF1

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Filenames autoexec.bat

File paths c:\mcc18\h

Keywords _asm, _endasm, static

Command-li n e op ti o ns -Opa+, -Opa-

Bit values 0, 1

Constants 0xFF, ‘A’

Italic Courier New A variable argument file.o, where file can be

any valid filena me

Square brackets [ ] Optional arguments mcc18 [options] file

[options]

Curly brackets and pipe

character: { | } Choice of mutually exclusive

arguments; an OR selection errorlevel {0|1}

Ellipses... Replaces repeated text var_name [,

var_name...]

Represents code supplied by

user void main (void)

{ ...

}

Preface

WARRANTY REGISTRATION

Please complete the enclosed Warranty Registration Card and mail it promptly.

Sending in the Warranty Registration Card entitles users to receive new product

updates. Interim software releases are available at the Microchip web site.

RECOMMENDED READING

This user’s guide d escrib es h ow to use th e Wi-Fi Com m Demo Board. The following

Microchip documents are available from the Microchip web site (www.micro-

chip.com), and are recommend ed as supplem ental reference resources.

MRF24WB0MA/MRF24WB0MB Data Sheet (DS70632)

PIC32MX5XX/6XX/7XX Family Data Sheet (DS61156)

THE MICROCHIP WEB SITE

Microchip provides online support via our web site at www.microchip.com. This web

site is used as a means to make files and information easily available to customers.

Accessible by using your favorite Internet browser, the web site contains the following

information:

•Product Support – Data sheets and errata, application notes and sample

programs, design resources, user’s guides and hardware support documents,

latest software releases and archived software

•General Technical Support – Frequently Asked Questions (FAQs), technical

support requests, online discussion groups, Microchip consultant program

member listing

•Business of Microchip – Product selector and ordering guides, latest Microchip

press release s, listing of seminars and e vents, listings of Microchip sales offices,

distributors and factory repr esentatives

Wi-Fi Comm Demo Board User’s Guide

DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE

Microchip’s customer notification service helps keep customers current on Microchip

products. Subscribers will receive e-mail notification whenever there are changes,

updates, re visions or errat a related to a specified produ ct family or development tool of

interest.

To register, a ccess the Micr ochip web si te at www.microchip.com, click on Customer

Change Notification and follow the re gis t ration instructions.

The Development Systems product group categories are:

•Compilers – The latest information on Microchip C compilers and other language

tools. These include the MPLAB® C18 and MPLAB C30 C compilers; MPASM™

and MPLAB ASM30 assemblers; MPLINK™ and MPLAB LINK30 object linkers;

and MPLIB™ and MPLAB LIB30 object librarians.

•Emulators – The latest information on Microchip in-circuit emulators.This

includes the MPLAB ICE 2000 and MPLAB ICE 4000.

•In-Circuit Debuggers – The latest information on the Microchip in-circuit

debugger, MPLAB ICD 2.

•MPLAB® IDE – The latest information on Microchip MPLAB IDE, the Windows®

Integrated Development Environment for development systems tools. This list is

focused on th e MP LAB IDE, M P LAB SIM simulator, MPLAB IDE Project Manager

and general editing an d debugging features.

•Programmers – The latest information on Micro chip progra mmers. These includ e

the MPLAB PM3 and PRO MATE® II device programmers and the PICSTART®

Plus and PICkit™ 1 development programmers.

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

Customers should contact their distributor, representative or field application engineer

(FAE) for support. Local sales offices are also available to help customers. A listing of

sales offices and locations is included in the back of this document.

Technical support is available through the web site at: http://support.microchip.com

DOCUMENT REVISION HISTORY

Revision A (March 2012)

This is the initial release of the do cu m en t.

Wi-Fi COMM DEMO BOARD

USER’S GUIDE

Chapter 1. Overview

1.1 INTRODUCTION

Thank you for purchasing the Microchip Technology’s Wi-Fi Comm Demonstration kit.

The Wi-Fi Comm Demo Board provides a low-cost and portable development system

for Microchip’s MRF24WB0MA 802.11b RF Transceiver module.

The Wi-Fi Comm Demo Board is preloaded with the demo software for the user to

explore the features of the MRF24WB0MA Wi-Fi module. It is also expandab le through

an expansion interface, which allows the user to extend its functionality by adding

various sensor expansion boards.

The topics discussed in this chapter include:

•Wi-Fi Comm Demostration kit Contents

•Functionality and Features

1.2 Wi-Fi COMM DEMOSTRATION KIT CONTENTS

The Wi-Fi Comm Demonstration Kit contains these items:

• Wi-Fi Comm Demo Board

• 2 AAA Lithium Batteries

• Wi-Fi Comm Demo Board Info rm at ion She et

1.3 FUNCTIONALITY AND FEATURES

A representation of the layout for the Wi-Fi Comm Demo Board is as shown in

Figure 1-1.

Wi-Fi Comm Demo Board User’s Guide

FIGURE 1-1: Wi-Fi COMM DEMO BOARD LAYOUT

The Wi-Fi Comm Demo Board includes the following key features:

1. MRF24WMB0MA RF Transceiver module

2. PIC32MX695F512H 32-bit microcontroller

3. MCP1642 +3.3V Boost regulator

4. Three status indicator LEDs

5. One push-button switch for user input

6. Power ON/OFF slider switch

7. 6-pin debug port

8. 8-pin sensor port

Wi-Fi COMM DEMO BOARD

USER’S GUIDE

Chapter 2. Hardware

This chapter describes the hardware features of the Wi-Fi Comm Demo Board.

2.1 HARDWARE FEATURES

The key features of the Wi-Fi Comm Demo Board are listed below and they are intro-

duced in the Section 1.3 “Functionality and Features”, see Figure 1-1 for their

locations on the board.

2.1.1 Wi-Fi Transceiver

The MRF24WMB0MA RF Transceiver module provides wireless connectivity to the

demo board. Host communication is through SPI2 of the PIC processor on the board.

2.1.2 Processor Support

The Wi-Fi Comm Demo Board is designed with a permanently mounted (soldered)

PIC32MX695F512H processor.

2.1.3 Power Supply

The board is powered through 2 AAA Lithium batteries. If required, the battery voltage

is monitored and boosted by the MCP1642 Synchronous Boost Regulator.

2.1.4 LEDs

The LED’s: LED0, LED1 and LED2 are connected to PORTE and PORTF of the

PIC32MX695F512H processor. To ON the LED’s, the port pins are set high.

2.1.5 Switches

The Wi-Fi Comm Demo Board contains the following switches:

• S1 – Controls the main power to the board. To turn on the board, move S1 slider

to the ON position.

• SW0 – Push-button switch, it is an active low switch connected to RD9 of the pro-

cessor. When Idle, switch is pulled high (+3.3V) an d when pressed, it is grounded.

2.1.6 Debug Port

Connector J14 provides easy access to the PIC32MX695F512H processors debug

pins.

2.1.7 Sensor Expansion Port

Connector J15 provides access to some of the processors spare I/O pins. These pins

can function as an SPI, UART, or I2C port to an attached sensor board or as general

purpose I/O.

Wi-Fi Comm Demo Board User’s Guide

NOTES:

Wi-Fi COMM DEMO BOARD

USER’S GUIDE

Chapter 3. Getting Started

3.1 OVERVIEW

Wireless Local Area Networks (WLAN) provide a unique challenge for configuring

embedded wireless products without a natural user interface. Unlike wired networks,

wireless networks require unique items such as the Service Set Identifier (SSID),

network typ e and security keys, and these items must be sent to the device in some

form or another.

Generally, the user would enter this information using a keyboard and display. The

Wi-Fi Comm dem o applic ation u ses a me chanism called Easy Config to allow for con-

figuration of an embedded device on a wireless network. It utilizes the web server of

the TCP/IP stack and a wireless ad hoc (independent basic service set) network to

allow the user to input the desired network information from a client browser, and then

reset the device to connect to the desired network.

3.2 RUNNING THE WI-FI COMM DEMO APPLICATION

This section describes how to connect to the Wi-Fi Comm Demo Board to control the

on board LED's and view the status of the SW0 switch from a web browser. It also

describes how to connect the Wi-Fi Comm Demo board to an existing network.

1. After powering, the Wi-Fi Comm Demo Board broadca sts an ad hoc network with

an SSID, MCHP_xxxx. Where, xxxx is the last four digits of the MRF24WMB0MA

RF Transceiver module’s MAC address (See Example 3-1).

EXAMPLE 3-1:

2. Connect a client device, such as a laptop, iPod® Touch, iPhone®, iPad®, to the

MCHP_xxxx ad hoc network.

3. After connecting the client device, use a st andard we b browser and enter the IP

address of the Wi-Fi Comm Demo Board. The default IP address is

http://169.254.1.1.

4. The following web p ages from the web server that is runnin g on the Wi-Fi Comm

Demo Board will be displayed.

a) The index.htm web page displays the additional information about the Wi-Fi

Comm Demo Board application. It also displays the continually updating status

of the three L EDs (LED0, LED1 and LED2) and p ush-button on the Wi-Fi Comm

Demo Board, see figure Figure 3-1. To control the LED's, click on the LED icon

on the Web page. To see the status of the push-button, press SW0 on the Wi-Fi

Comm Demo Board.

MRF24WMB0MA MAC (SN): 001EC001E627

AD HOC SSID: MCHP_E627

Wi-Fi Comm Demo Board User’s Guide

FIGURE 3-1: SAMPLE INDEX.HTM WEB PAGE

b) The configure.htm web page allows the user to scan fo r nearby networks and

connect to the selected network, see Figure 3-2.

FIGURE 3-2: SAMPLE CONFIGURE.HTM WEB PAGE

5. To connect the Wi-Fi Comm Demo board to an existing network:

Click Scan for Wireless Networks on the configure.htm web page.

6. When a new network is selected, the Wi-Fi Comm Demo Board will reset

automatically using the parameters (SSID, security key) of the new network.

7. To continue using the demo, the client device must be reconnected to the same

network where Wi-Fi Comm Demo Board is on.

Getting Started

3.3 AD HOC NETWORKS

On starting the demo, the product will either connect to another ad hoc network or will

start its own if ad hoc n etwork is not found. Ad hoc networks are pee r-to-peer networks

with no centralized coordinator for the network; all the devices share the responsibilities

of keeping the network running. One downfall of ad hoc networks is that typically

security is not employed on them.

The MRF24WB0M module can secure an ad hoc network with Wired Equivalent

Privacy (WEP) (40-bit/104-bit) security, like most of the laptops and ad hoc devices.

Very few devices in the market can secure an ad hoc network with Wi-Fi Protected

Access (WPA) level security due to tremendous overhead.

The demo st arts on an ad hoc network without security. This means that all the network

information that is being configured on the device is going over-the-air in the open. For

most applications, unless somebody is specifically attempting to listen in on this

network, there should be minor impact on security. However, for applications that

require baseline level of security, WEP can be employed on the network.

3.4 ZERO CONFIGURATION/BONJOUR

Zero Configuration (Zeroconf) provides a mechanism to simplify the device

configuration on a network. The term Zerocon f is titled from the names Bonjour (Apple)

and Avahi (Linux), and is an Internet Engineering Task Force (IETF) standard.

Zeroconf provides simplified naming conventions, instead of relying on the IP

addresses alone. The Zeroconf is built on the following three core technologies.

3.4.1 Link Local

The first component of Zeroconf is the ability to self-assign an IP address to each

member of a ne two rk . Us ua lly, a Dynam ic Ho st Con fig ura tio n Pr ot oc ol ( DHC P) server

handles such situations. However, when no DHCP server exists, Zeroconf enabled

devices negotiate the unique IP address amongst themselves.

3.4.2 Multicast DNS

The second component of Zeroconf is the ability to self-assign the host names.

Multicast Domain Name System (DNS) provides the local network with the ability to

have the features of a DNS server . User can use the host names to access the devices

on the network. When devices se lect to use the same h ost name, as in the IP address

resolution, each of the devices will self-assign the Auto-negotiate New Names, usually

appending a number at the end of the name.

3.4.3 Service Discovery

The last component of Zeroconf is service discovery. All Zeroconf devices can

broadcast what services they provide. For instance, a printer can broadcast about

available printing services. A thermostat can broadcast that it has an HVAC control

service. For a specific service, the user can see the list of devices that provide the

service, an d co nn ec t to it. T h is eliminates the need to know whether something exists

on a network (and what it's IP or host name is). Th e user can query the ne twork to see

if a certain service exists or not, and easily connect to it.

Note: The demo board will always attempt to connect to the last known network.

If the user wants to reset the demo to startup in ad hoc mode again, then

simply slide the power switch S1 to the OFF position and then ba ck to the

ON position.

Wi-Fi Comm Demo Board User’s Guide

3.5 CONFIGURED VS. UNCONFIGURED STATE

When the Wi-Fi Comm demo is in an unconfigured state (i.e, serving the default

MCHP_xxxx SSID in ad hoc mode), the LED (LED0) will blink twice per second to indi-

cate it is not configured. After the network is configured, the LED will blink once per

second.

Note: When the Wi-Fi Comm Demo Board is mo ved to a differ ent network, a new

IP address will be assigned to it. As the Wi-Fi Comm Demo Board does not

display the new IP address, the user must obtain the new IP address from

the server that assigned it. Refer to your server’s documentation for the

necessary steps required to obtain the new IP address.

Wi-Fi COMM DEMO BOARD

USER’S GUIDE

Appendix A. Wi-Fi Comm Demo Board Schematic

A.1 INTRODUCTION

This appendix provides the Wi-Fi Comm Demo Board schematic.

Wi-Fi Comm Demo Board User’s Guide

FIGURE A-1: Wi-Fi COMM DEMO BOARD SCHEMATIC

Wi-Fi Comm Demo Board Schematic

NOTES:

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