Texas Instruments 2541EM User Manual

SWRU

311

December

2011

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www.ti.com/lprf

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2541

Evaluation Module

Kit

Quick Start

Guide

Opening the B

ox an

d R

unning the

Bluetooth

Low Energy

SimpleBLE

Demo Application

1. Kit Contents



2 x CC

2541Evaluation Mod

les2 x

Pulse

W1010

ntennas



Documentation

The kit is

FCC and IC certified and

tested/complies with ETSI/R&TTE

over

temperature

from

0 to +35

C. The antenna

W1010 from Pulse,

is a ¼ wave dipole antenna

with 2 dBi gain.

Caution!

The

kit c

ontains

ESD

sensitive components. Handle with

care to prevent permanent damage.

Hardware

quirements

The CC2541EMK is an add

on kit to the

CC2540DK. To run the example described in

this Quick Start Guide, you would need

two

SmartRF05 Boards (Rev 1.8.1 or later)

. These

boards are included in the CC2540DK (and

not in the CC2541EMK).

More infor

mation about the SmartRF05EB can

be found in

www.ti.com/lit/swru210

The CC2541

EM boards can

also

be plugged

into a battery board (see

www.ti.com/tool/soc

-bb) for

standalone operation.

Hardware

Setup

Connect the antenna to the SMA connector on

the CC2541 evaluation module (CC2541EM).

Tighten the antenna’s screw firmly on to the SMA

connector. If not properly connected, you might

see reduced RF performance.

ext, mount the CC2541EMs

firmly on to connectors P5

and P6 on the

SmartRF05EB.

Caution!

To minimize risk of injury, avoid

touching components during operation if

symbolized as hot.

Power Options

There are several ways of applying power to the

Smar

tRF05EB.



2 x 1.5 V AA

Alkaline

Batteries



USB



External Power Supply

For the batteries and USB, there are voltage

regulators on the SmartRF05EB that will set the

on-board voltage to 3.3 V. The external power

supply should set a voltage that does not exceed

3.3 V.

Note that there should only be one

active power source at any one time.

Warning!

To minimize risk of personal injury or

property damage, never use rechargeable

batteries to power the board.

5.Power the

oards

Find jumper P11 on

the top side of each

SmartRF05EB. This jumper is used to set the

power source for the board. Set P11 to “1

2” if

you are using battery power. Set P11 to “2

3” if

you are using USB or an

external power supply.

Once you have set P

11,

find switch P8 on the top

side of each

SmartRF05EB. To power up the boards, flip the

switch from the “OFF” position to “ON”

Do not leave EVM powered when

unattended.

6.Start

up Screen

One of the CC2541

EMs

will be pre

loaded

with the SimpleBLECentral application, while

the other will be p

re-loaded with the

SimpleBLEPeripheral application. The LCD

screens on the two SmartRF05EBs should

display message

similar to those below:

The “0x…” value displayed on each board is

the device address. Every

CC25

dev

ice

has

a unique address.

7.Using the Joystick

The SimpleBLEPeripheral application runs

autonomously and does not require any user

interaction. The SimpleBLECentral application,

however,

requires user interaction by means of

joystick U1. Find joys

tick U1 on the top side of

the SmartRF05EB, immediately below the LCD.

The joystick has five different movements: it can

be moved up, down, left, right, and it can

pressed in

, just

like a button. Each movement

performs different ac

tions depending on the state

of the device.

8.Device Discovery

Before the two devices

can connect, the central

device must first

discover the peripheral

device. To perform

device discovery, press

up on joystick U1 once.

The LCD on the central

device sho

uld display

“Discovering…”.

After a few seconds, it should display “Devices

Found 1 / <

To Select”. This means that the

central device successfully discovered the

peripheral. Press left on joystick U1 to view the

address of the peripheral device. This

address

should match the address seen on the

peripheral’s LCD.

9.Establish Connection

To establish a

connection with

the peripheral,

press joystick U1

in towards the

board (push it in

like it is a button).

Once

the

connection is

established, the central device will

automatically perform service discovery on the

peripheral using the

BLE

GATT protocol. This

should complete within a few

seconds.

The two LCD screens should appear as in the

images below, with the cen

tral still displaying

the peripheral’s address

and the peripheral

having changed from “Advertising” to

“Connected”:

Be careful that you don’t double tap U1 which

would terminate the connection immediately,

giving

Disconnected Reason: 22

10.Connected Operations

Once the connection has been established and

service discovery is complete, you can perform

the following operations using joystick U1 on the

central device:



Read / Write Data

–



RSSI Monitoring

–

DOWN



Connection Parameter Update

–

RIGHT



Terminate Link

–

U1IN(towards the board)

11.

Read / Write Data

ressing up on U1 will send a read request to the

peripheral device. One byte of data will be read,

and the value will be

displayed. Pressing up

again will send a write request, and one byte of

data will be written to the peripheral. The

peripheral’s LCD should display the written value

each time this is done

Bluetooth

low energy i

s an ideal technology for

transmission of small amounts of data between

two devices

while consuming very little power, as

is demonstrated here.

Continuing to press up on the joystick will

alternate between reads and writes

, with the

value incrementing eac

h time

12.

Monitor RSSI

ressing down on U1 will turn on RSSI (received

signal strength indication) monitoring. The RSSI

will be displayed on the LCD in units of negative

dBm.

If the boards are moved farther apart from each

other,

the RSSI will drop (since the value is

negative, a higher number means lower RSSI). If

they are moved closer together, the RSSI should

rise.

Pressing down on U1 again will turn off RSSI

monitoring.

13. Connection Parameter

Update

ressing

right

on U1 wi

ll send a

connection

parameter update request to the peripheral to

use a longer connection interval. This will result

in much longer latency when performing data

reads and writes; however the power consumed

by both devices is significantly reduced.

14.

Terminate Link

ressing U1 in

towards the board

will terminate

the link. The peripheral will return to an

advertising state

The central device will display

a “Reason” code, which indicates why the

disconnection occurred (values are def

ined in the

BLE stack API).

In this case, the reason code of 22 indicates that

the link termination was initiated by the central

device. In the e

vent that the peripheral device

goes out of range or has power discon

nected

from it, you will see a reason code of

which

indicates that a link timeout has occurred.

ou can

now

perform

device discovery and re

connect to the peripheral if desired.

15.

SimpleBLE Demo Source

Code

The project and source code

files

for these

applications

(as well as many others)

are

included with the

Bluetooth low energy (BLE)

stack from Texas Instruments, which can be

downloaded at

www.ti.com/blestack

The two projects implementing this demo are

alled SimpleBLECentral (

CC2541

Master

configuration)

and SimpleBLEPeripheral

(

CC2541

Slave configuration)

These can be

modified as desired, and should provide a good

framework for developing your own custom BLE

applications.

More details on these

proje

cts

can be found

within the BLE Software Developer’s Guide,

which is included with the stack

dditional Tools

and

Links

BLE Packet Sniffer

CC2540 USB Dongle

(not

included

)

can be

used as a BLE sniffer and monitor packets while

the SimpleBLE Demo is

running.

The SmartRF Protocol Packet Sniffer software

can be downloaded

from

www.ti.com/packetsniffer

SmartRF

™

Studio

SmartRF Studio allows you to configure the radio,

run RF performance tests, and run link tests

between the two SmartRF05EBs.

SmartRF Studio can be downloaded

from

www.ti.com/smartrfstudio

Smart

RF Flash Programmer

Texas Instruments has a simple tool which can

be used

to program and flash the

CC2541

SmartRF Flash Programmer can be

downloaded from

www.ti.com/tool/flash

programmer

BTool

BTool is a Windows application that allows you to

control a central device

using the serial interface

and perform various

BLE

functions

while

connected to a peripheral device.

BTool is included as part of the installation of the

BLE stack (see “Useful L

inks” to the right).

IAR Embedded Workbench

To develop softwar

e, program, and debug the

CC2541

, you should use IAR Embedded

Workbench for 8051

More information on IAR EW8051, including a

free evaluation version download, can be found at

www.iar.com/ew8051

Useful Links

TI BLE Stack and Software:

www.ti.com/blestack

CC2540

/41

Development Kit User Guide:

www.ti.com

/lit/pdf/swru301

CC2540

BLE Software Developer’s Guide:

www.ti.com/lit/pdf/swru271

CC2540

/41

User

’s

Guide:

http://www.ti.com/lit/pdf/swru191

CC2541

Prod

uct Page:

www.ti.com/cc254

For additional help, visit the TI E2E Forums:

www.ti.com/lprf

forum

EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS

Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following

conditions:

The user assumes all responsibility and liability for proper and safe handling of the

goods. Further, the user

indemnifies TI from all claims arising from the handling or use of the goods.

Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/ kit may be

returned within 30 days from the date

of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS

THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER

WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF

MERCHANTABILITYOR FITNESS FOR ANY PARTICULA

R PURPOSE. EXCEPT TO THE EXTENT OF THE

INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY

INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

Pleaseread the User's Guide and, specifically, theWarningsand Restrictionsnot

ice in the User'sGuide prior to

handling the product. This notice contains important safety information about temperatures and voltages. For

additional information on TI's environmental and/or safety programs, please visit

www.ti.com/esh

or contact TI.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any

machine, process, or combination in which such TI products or services might be or are used.TI currently

deals

with a variety of customersfor products, and therefore our arrangement with the user is not exclusive. TI

assumes no liability for applications assistance, customer product design, software performance, or

infringement of patents or services descri

bed herein.

Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265

REGULATORY COMPLIANCE INFORMATION

As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompany

ing hardwaremay or may not

be subject to the Federal Communications Commission (FCC) and Industry Canada (IC) rules.

For EVMs

not

subject to the above rules, this evaluation board/kit/module is intended for use for

ENGINEERING DEVELOPMENT, DEMONSTRATION

OR EVALUATION PURPOSES ONLY and is not

considered by TI to be a finished end product fit for general consumer use. It generates, uses, and can radiate

radio frequency energy and has not been tested for compliance with the limits of computing devices pursua

nt to

part 15 of FCC or ICES

003 rules, which are designed to provide reasonable protection against radio frequency

interference. Operation of the equipment may cause interference with radio communications, in which case the

userat his own expense will be

requiredto take whatever measures may be required to correct this interference.

General Statement for EVMs including a radio

User Power/Frequency Use Obligations:

This radio is intendedfor development/professional use only in legally

allocat

ed frequen

cy and power limits.

Any use of radiofrequencies and/or power availability of this EVM and its

developmentapplication(s)mustcomplywith local lawsgoverningradio spectrum allocation and powerlim

itsfor

this evaluation module.

It is the user’s sole re

sponsibility to only operate this radio in legally acceptable

frequency space and within lega

lly mandated power limitations.

Any exceptions to this is strictly prohibited and

unauthorized by Texas Instruments unless user has obtained appropriate experiment

al/development licenses

from local regulatory authorities, which is responsibility of user including its acceptable authorization.

+ 4 hidden pages

Texas Instruments 2541EM User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual