SWRU300
August
2011
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CC
2540
Development Kit
Quick Start
Guide
Opening the B
ox an
d R
unning the
Bluetooth
®
Low Energy
SimpleBLE
Demo Application
1. Kit Contents
2xSmartRF
05EB (the two large boards)
2 x CC
2540 Evaluation Mod
u
les
2 x
Pulse A
ntennas
1 x
CC2540 USB Dongle
Cables
Documentation
Please contact a TI Representative if any parts
are missing from the kit.
2.
Hardware Setup
Connect the antennas to the SMA connector on
the RF evaluation boards. Tighten the antenna’s
screw firmly on to the
SMA connector. If not
properly connected, you might see reduced RF
performance. Next, mount the
CC2540
evaluation modules (
CC2540
EMs) on to
connectors P5 and P6 on the SmartRF05EB.
Make sure that the boards are pressed firmly
into the connectors.
3.Power Options
There are several ways of applying power to
the
SmartRF05
EB.
2 x 1.5 V AA
B
atteries
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 extern
al
power supply should set a voltage that does
no
t exceed 3.3 V.
Note that there should only be one active
power source at any one time.
4. Se
t
Jumper P11
Find jumper P11 on the top side of each
SmartRF05EB. This jumper is used to set the
power sourc
e 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.
5.Turn on the Boards
Once you have set P11, find switch P8 on the
top side
of each SmartRF05EB. To power up
the boards, flip the switch from the “OFF”
position to “ON”
6.Start
-
up Screen
One of the CC2540
EMs
will be pre
-
loaded
with the SimpleBLECentral application, while
the other will be pre
-
loaded with the
SimpleBLEPeripheral
application. The LCD
screens on the two SmartRF05EBs should
display message
s
similar to those below:
The “0x…” value displayed on each board is
the device address. Every CC2540 dev
ice
has
a unique address.
7.Us
ing 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 joystick U1 on the top side of
the SmartRF
05EB, immediately below the LCD.
The joystick has five different movements: it can
be moved up, down, left, right, and it can pressed
in like a button. Each movement performs
different actions 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 should display
“Discovering…”.
After a few seco
nds, 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
pe
ripheral’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 devi
ce 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 central still displaying
the peripheral’s address
and the peripheral
having changed from “Advertising” to
“Connected”:
10.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
–
U1
UP
RSSI Monitoring
–
U1
DOWN
Connection Parameter Update
–
U1
RIGHT
Terminate Link
–
U1IN(towards the board)
11.
Read / Write Data
P
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
ea
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
.
12.
Monitor RSSI
P
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.
13. Connection Parameter
Update
P
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.
14.
Terminate Link
P
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
l
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
8
which
indicates that a link timeout has occurred.
Y
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 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
.
A
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
s
” to the right).
IAR Embedded Workbench
To develop software, program, and debug the
CC2540, 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 Development Kit User Guide:
www.ti.com/lit/pdf/swru301
CC2540
BLE Software Developer’s Guide:
www.ti.com/lit
/pdf/swru271
CC2540 User
’sGuide:
http://www.ti.com/lit
/pdf/swr
u
191
CC2540 Product Page:
www.ti.com/cc2540
For additional help, visit the TI E2E Forums:
www.ti.com/lprf
-
forum
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