AN4127
Application note
Demonstration board for Bluetooth® module class 2
SBT2632C2A.AT2
Introduction
This document describes the STEVAL-SPBT3ATV3 demonstration board (dongle) for the
Bluetooth® class 2 SPBT2632C2A.AT2 module.
The dongle includes the module under evaluation, an RF antenna, and a USB connector.
The USB connector is used to connect the dongle with a PC, to access the Bluetooth
module and to supply the dongle.
The STEVAL-SPBT3ATV3 is an easy solution to test and operate with the
SPBT2632C2A.AT2 module and familiarize the user with the embedded FW which enables
the creation of a Bluetooth link with simple AT commands. The AT command list is detailed
in the UM1547 user manual.
This document introduces the main technical characteristics of the dongle and includes a
quick start guide to get started with the STEVAL-SPBT3ATV3.
Dongle features:
■
Based on V3.0 Bluetooth class 2 module, SPBT2632C2A.AT2
■
USB interface and power supply
■
Supported reprogrammability via USB interface
■
Reset button
■
Antenna onboard
■
RoHS compliant
Figure 1.
June 2012
STEVAL-SPBT3ATV3 dongle
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Contents
AN4127
Contents
1
Demonstration board usage limitation . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3
Dongle layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4
I/O connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.1
PAD description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.2
Reset switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Dongle schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.1
Dongle installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.2
Setup and connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.2.1
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.2.2
Inquiry and available services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.2.3
Command and answer syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.2.4
GPIO and LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Appendix A USB driver installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7
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1
Demonstration board usage limitation
Demonstration board usage limitation
The dongle based on the SPBT2632C2A.AT2 module is not qualified; it is a pure
demonstration tool only for evaluation purposes and not a product in itself.
2
Recommended operating conditions
Table 1.
Symbol
Recommended operating conditions
Parameter
VDD
Board supply voltage
Top
Operating case temperature range
Condition
Min.
Typ.
Max.
Unit
-40 °C < T < 85 °C
4.5
5
5.5
V
+85
°C
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Dongle layout
3
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Dongle layout
Figure 2.
Dongle component layout, front side
Figure 3.
Dongle component layout, bottom side
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I/O connections
4
I/O connections
4.1
PAD description
Other than the USB plug, some pads are also available. In fact PAD1 to PAD13 make the
SPBT2632C2A.AT2 pins available to the user.
Figure 4.
Front side connection
PAD 1 to 3
1
Figure 5.
Bottom side connection
J1 JTAG connector
LED1
3
13
4
PAD 4 to 13
LED3
LED2
AM12669V1
AM12670V1
Table 2 gives a description of these pads.
Table 2.
Pad connections
Description
PAD
1
BOOT0 - Boot pin used for firmware downloading - used for testing purposes
2
3.3 V (module – LED1 is connected to this PAD)
3
RESETN - reset - connected in parallel to onboard reset switch
4
GND
5
+5 V (USB)
6
LPO (external 32.768 kHz frequency input to allow deep sleep and sniff mode
Bluetooth module functional states)
7
GPIO07 – general purpose I/O
8
GPIO01 – general purpose I/O (1) (LED2 is connected to this GPIO)
9
GPIO02 – general purpose I/O (1)
10
GPIO03 – general purpose I/O (1)
11
GPIO04 – general purpose I/O (1) (LED3 is connected to this GPIO)
12
GPIO06 – general purpose I/O (1)
13
GPIO05 – general purpose I/O
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I/O connections
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Table 2.
Pad connections (continued)
Description
1
JTRST
2
JTDO
3
JTCK
4
JTMS
5
JTDI
6
nRESET (max. voltage 2.5 V)
7
+ 3.3 V
8
GND
JTAG
1. Default configuration - a different configuration may be chosen (see the SPBT2632C2A.AT2 datasheet).
4.2
Reset switch
A reset switch SW1 is present on the dongle. When SW1 is pushed, SPBT2632C2A.AT2 is
forced to reset.
The following prompt is displayed on the screen:
●
AT-AB - CommandMode
●
AT-AB BDAddress xxxxxxxxxxxx
Figure 6.
Reset switch
Reset switch
AM12671V1
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AN4127
Dongle schematic
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!-V
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Getting started
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6
Getting started
6.1
Dongle installation
The Bluetooth SPBT2632C2.AT2 module and the related dongle do not need any Bluetooth
driver on the host processor. However, before using a new USB device the user must install
it on their PC.
If the USB driver is not present on the PC, it is necessary to apply a simple installation
procedure as follows:
●
Step 1:
Simply plug the STEVAL-SPBT3ATV3 into any available USB port. The computer
responds with the following two messages:
Figure 8.
●
USB drive installation first and second step
Step 2:
Next, a “Found New Hardware Wizard” installation window opens. Select ‘Yes, this time
only’ to locate the drivers from the Microsoft® website.
Figure 9.
Wizard installation first step
Click ‘Next’ to install automatically.
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Getting started
Figure 10. Wizard installation second step
The STEVAL-SPBT3ATV3 USB to UART controller and virtual COM port driver is now
installed.
●
Step 3:
The “Found New Hardware Wizard” now opens again in order to install the USB device
driver.
Select ‘Yes, this time only’ to locate the drivers from the Microsoft website.
Figure 11. Wizard installation third step
The following message appears:
Figure 12. Wizard installation completed
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Getting started
●
AN4127
Step 4:
Open the Windows® device manager application to verify correct installation, and see which
COM port has been assigned to the STEVAL-SPBT3ATV3 Bluetooth serial device. The
STEVAL-SPBT3ATV3 is usually assigned the same virtual COM port each time it is inserted
(unless there are other virtual COM devices altering port assignments).
Two device drivers for the STEVAL-SPBT3ATV3 Bluetooth device should be seen here.
Figure 13. Windows device manager
The CP2102 chip provides the function of using standard UART serial communications from
the computer via the universal serial bus, and interfaces directly to the Bluetooth module
inside the STEVAL-SPBT3ATV3 Bluetooth serial adapter. If USB driver wizard installation
fails, follow Appendix A: USB driver installation installation procedure.
6.2
Setup and connect
The purpose of this section is to describe all the necessary steps to establish a connection
between two Bluetooth STEVAL-SPBT3ATV3 dongles realizing a serial line/cable
replacement application.
Two PCs and two STEVAL-SPBT3ATV3 boards are needed to perform the connection.
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Getting started
Figure 14. Basic setup
6FUHHQ
'RQJOH
'RQJOH
'RQJOH
6FUHHQ
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!-V
(Please refer to the UM1547 user manual for the listing and meaning of the AT commands.)
6.2.1
Startup
Two dongles are needed to perform the connection.
Each dongle has its own BD address. Suppose 0080e1f00001 for dongle1 and
0080e1f00002 for dongle2.
Each dongle has the following factory default:
–
UART: 115200 baud rate, no parity, 1 stop bit, 8 data bits
–
Local name: “Amp'ed UP!’
–
Class of device: misc. device
–
Profile: SPP (serial port profile)
–
Service name: “AMP-SPP”
–
Deep sleep: disabled
–
Page and inquiry scan: 1.28s interval, 11ms duration
–
Security: disabled
–
Bonding PIN: “1234”
–
Bonding allowed: always enabled
●
Plug each dongle into the PC using the USB connector
●
Open the HyperTerminal program on both PCs and create a new connection “AT
Command”.
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Getting started
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Figure 15. Connection setup
Set the connection port:
Figure 16. Connection port setup
and configure it:
Figure 17. Port parameters
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Getting started
with the following parameters:
–
Select the proper COM line (COM1, COM2……)
–
Set baud rate = 115000 (default baud rate of SPBT2632C2.AT2 module)
–
Set data bits = 8
–
Set stop bits = 1
–
Set parity = none
–
Set flow control = none
From the menu file set the AT command connection properties:
Figure 18. Connection properties setup
!-V
The dongle is ready to use:
–
Press the reset switch on the dongle
–
On the screen, the prompt followed by the module Bluetooth address should
appear:
Figure 19. AT command prompt
“AT-AB -CommandMode -”
“AT-AB BDAddress xxxxxxxxxxxx”
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Figure 20. BDAddress dongle1, dongle2
From now on the user can operate the dongle using the AT commands.
6.2.2
Inquiry and available services
Before establishing a connection, the dongle must know which Bluetooth devices are
present and which services are offered. Each module has its own address which identifies
the module itself in the network. The BD address can be found during the discovery phase.
If the BD address of the Bluetooth device the user wants to connect to is known, the inquiry
procedure can be omitted.
●
Discovery:
–
AT+AB discovery
This command returns the number of responses of nearby devices and then the individual
responses with the BD address, and device name. The number of devices returned is
limited to 10.
Inquiry is performed with an interval of 10.24 seconds.
The devices are reported in the same order as the original inquiry results.
For each name or service name request that is successful, the response uses the returned
names in the following format:
–
AT-AB device [BD addr] [name]
–
AT-AB device [BD addr] Unknown
As a consequence of a discovery command issued by dongle1, the following lines are
displayed:
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Getting started
Figure 21. Discovery dongle1
Note:
In the case of 1 device found.
●
Service:
To verify, at the same time, which kind of service is available, use the command:
AT+AB discovery [CoD] [profile]
Response is:
AT-AB device [BD addr] [name]
As a consequence of a discovery command for SPP service issued by dongle1, the
following appears on the screen:
Figure 22. Service dongle1
Note:
In the case of 1 device found.
●
Bonding:
Bonding is used when an application needs to pair with another remote device. Devices
must be enabled to bond, with this aim, the EnableBond command is used. The BD
address, PIN and timeout parameters are optional.
–
AT+AB EnableBond
If the operation is successful, the response is:
–
AT-AB BondEnabled
To bond devices the “bond command” is used where the device address and the
identification number (PIN) is specified.
The command is:
–
AT+AB bond [BD addr] [Pin]
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If the request is successfully submitted, the response is:
–
AT-AB BondPending [BD addr]
If the operation is successful, the response is:
–
AT-AB BondOk
If it fails:
–
AT-AB BondFail
In this case, dongle1 is requesting a bonding with dongle2.
Figure 23. Bonding dongle1, dongle2
●
Connection:
Once the dongle knows the device present and the service offered, the command to set up
connection is:
–
AT+AB SPPconnect [BD Addr] [Service]
If the connection is successful, the response is:
–
AT-AB ConnectionUp
–
AT-AB -BypassMode-
At this point the connection is established. The dongles can send and receive data. In this
case, dongle1 knows the address of dongle2, and wants to connect to dongle2:
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Getting started
Figure 24. Connection dongle1, dongle2
Now the two dongles are connected to one another and in -BypassMode-.
In other words, everything typed on a terminal is transferred to the other via the Bluetooth
link and vice versa. In -BypassMode- the dongle doesn't answer the commands.
If, for example, the user needs to change some parameters of a dongle, it’s necessary to
switch to -CommandMode-, giving the “escape command”.
The escape command is a special sequence of characters followed by at least two seconds
of inactivity on the serial port.
The escape command sequence is: ^ #^$^%.
Figure 25. Escape dongle1, dongle2
As can be noted, the escape command given to dongle1 doesn't affect dongle2 which
remains in -BypassMode-.
Connection between the two dongles is still active; to return to the “exchange data” situation,
dongle1 must be re-configured in -BypassMode- with the command “Bypass”.
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Figure 26. Return to -BypassMode- dongle1, dongle2
Now the two dongles can exchange data again.
●
Disconnection:
The SPPDisconnect command is used to terminate a connection with the remote device.
–
AT+AB SPPDisconnect
If the disconnection is successful, the response is:
–
AT-AB SPPConnectionClosed
SPPDisconnect is a command; it is recognized and accepted by the dongle only if the
dongle is in -CommandMode-.
If the dongle is in -BypassMode-, send the “escape command” before giving the
disconnection command.
Figure 27. Disconnection dongle1, dongle2
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Getting started
Information related to successful disconnection is displayed on both screens.
●
Smart cable setup:
The smart cable setup command is used to enable and configure a SmartCable device.
A device BD address is specified with which to automatically establish a connection,
replacing the need for AT connection commands.
It is stored in the non-volatile memory.
The command is:
–
AT+AB SmartCableSetup [BD Addr] [Attempts] [Interval]
If the command is successful, the response is:
–
AT-AB SmartCableConfigDone
In this case, suppose an automatic connection of dongle1 to dongle2 at power-on is
needed, with the possibility to retry for 5 times with an interval of 1 sec between each retry.
The command is:
–
AT+AB SmartCableSetup 0080e1f00002 5 1
This command is stored inside the non-volatile memory and executed at power-on.
In case dongle2 is already powered:
Figure 28. Smart cable dongle1, dongle2
If dongle2 is not powered or not available, dongle1 automatically retries 5 times.
Figure 29. Automatic retrial dongle1
If dongle2 is present, dongle1 automatically connects. If dongle2 is unplugged, connection
fails. However, connection is automatically restored if dongle2 is again plugged in during the
interval of retrial assigned to dongle1.
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Figure 30. Automatic connection dongle1, dongle2
●
Delete smart cable setup:
The command to remove the SmartCableSetup is:
–
AT+AB DeleteSmartCable
If the operation is successful, the answer is:
–
AT-AB DeleteSmartCableDone
To give the command the dongle must be in; -CommandMode-.
●
Erase bond table:
The erase bond table command must be used to clear all the bonded device entries:
–
AT+AB EraseBondTable
If the operation is successful, the answer is:
–
6.2.3
AT-AB BondTableErased
Command and answer syntax
The syntax of the commands is fixed and cannot be changed, the prefix for each command
is AT+AB.
Each command has an answer which is preceded by the prefix AT-AB; this identifier can be
changed by means of the AT+AB config command.
If it is necessary to change the prefix of the answer from AT-AB to “>>” on dongle1, the steps
to follow are shown in Figure 31:
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Getting started
Figure 31. Change syntax dongle1
Note:
Change reply prefix.
6.2.4
GPIO and LED
The SPBT2632C2A.AT2 has several pins which can be configured as GPIOs (GPIO01 to
GPIO07).
If GPIO function is selected, GPIO direction (input/output) and GPIO level can be chosen by
means of the AT commands.
GPIO must be configured for output or input using the proper command:
–
AT+AB GPIOConfig [GPIO Pin] I for input
–
AT+AB GPIOConfig [GPIO Pin] O for output
Once configured, the GPIO port can be read or written with the commands:
–
AT+AB GPIOWrite [GPIO Pin] 1 write 1
–
AT+AB GPIOWrite [GPIO Pin] 0 write 0
–
AT+AB GPIORead [GPIO Pin] read
On the dongle there are 2 LEDs connected to GPIOs: LED2 connected to GPIO01 and
LED3 to GPIO004.
Each LED can be switched on/off by driving the corresponding GPIO with the proper AT
command.
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Example:
Figure 32. GPIO set dongle1
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USB driver installation
Appendix A
USB driver installation
If USB driver wizard installation fails, the dongle can be installed using the driver available
on the silicon lab website at
www.silabs.com/support/pages/support.aspx?ProductFamily=USB+to+UART&PartNumber
=cp2102.
Insert the dongle into a USB port on the PC, follow the steps described in Section 6.1 of this
document.
Figure 33. USB driver installation launch
Figure 34. License agreement
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USB driver installation
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Figure 35. Wizard installation 1
Figure 36. Wizard installation 2
Figure 37. Wizard installation 3
!-V
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USB driver installation
Figure 38. Wizard installation terminated
Figure 39. Installation completed
The USB driver installation is now complete.
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Revision history
7
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Revision history
Table 3.
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Document revision history
Date
Revision
21-Jun-2012
1
Changes
Initial release.
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