User's Manual

ManualsBrandsTexas Instruments ManualsElectronicsThe CC2540Dongle is a development tool for the 2.4 GHz CC2540 BLE System-on-Chip with USB from TI.

Connected Operations

Once the connection has been established and

service discovery is complete, you can perform

the following operation

s using joystick U1 on the

central device:



Read / Write Data

–



RSSI Monitoring

–

DOWN



Connection Parameter Update

–

RIGHT



Terminate Link

–

(towards the board)

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

ch time this is done

Bluetooth

low energy is 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 o

n the joystick will

alternate between reads and writes

, with the

value incrementing each time

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 negat

ive

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 w

ill turn off RSSI

monitoring.

. Connection Parameter

Update

ressing

right

on U1 will 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 a

nd writes; however the power consumed

by both devices is significantly reduced.

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 defined in the

BLE stack API).

In this case, the reason code of 22 indicates that

the link termination was initiated by the centra

device. In the e

vent that the peripheral device

goes out of range or has power disconnected

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.

SimpleBLE Demo Source

Code

The project and source code

files

for these

applications

(as well as many others)

are

included with the CC2540 Bluetooth low energy

(BLE) stack from Texas Instruments, which can

be downloaded at

www.ti.com/blestack

The two projects implementing this demo are

called SimpleBLECentral (CC2540EM Master

configuration) and SimpleBLEPeripheral

(CC2540 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

projects

can be found

within the CC2540 BLE Software Developer’s

Guide, which is included with the stack. More

information on the CC2540 Development Kit can

be found i

n the CC2540DK User’s Guide, which

can be downloaded at

www.ti.com/lit/pdf/swru301

dditional Tools

and

Links

BLE Packet Sniffer

The CC2540 USB Dongle included with the

development kit 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

Sma

rtRF 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

SmartRF Flash Programmer

Texas Instruments has a simple tool which can

be used to program and flash the CC2540

SmartRF Flash Programmer can be

downloaded from

focus.ti.com/docs/toolsw/folders/print/

flash

programmer.html

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 Link

” to the right).

IAR Embedded Workbench

To develop software, program, and debug the

CC2540, you should use IAR Embedded

Workbench for 8051

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 Development Kit User Guide:

www.ti.com/lit/pdf/swru301

CC2540

BLE Software Developer’s Guide:

www.ti.com/lit

/pdf/swru271

CC2540 User

’

Guide:

http://www.ti.com/lit

/pdf/swr

191

CC2540 Product Page:

www.ti.com/cc2540

For additional help, visit the TI E2E Forums:

www.ti.com/lprf

forum