Low Power RF Bluetooth® Low Energy & ANT Forum - Recent Threads

Can a broadcaster application be notified of a scan request ?

Damien Piguet — Fri, 17 May 2013 12:25:11 GMT

Hello,

I am using the CC2540 together with TI BLE 1.3.

One device runs the SimpleBLEObserver application, the other one the SimpleBLEBroadcaster.

I have modified the Observer so that it performs active scans. The broadcaster receives the scan request and responds with a scan response all right, but I would like the broadcaster application to be made aware that the device received a scan request (I don't need any other information, just the info that a device has been scanning it).

Is there a way to do that ? Is it possible to register a notifier ?

I tried using an RSSI notifier but it appears to work only when in a connection.

Thanks and best regards,

Damien

Few Questions on TI Bluetooth Low Energy Stack features

Cryptoman — Tue, 14 May 2013 22:42:12 GMT

Hi,

I am trying to assess whether networking could be possible by using the TI's BLE stack and I would like to find the answers to the following questions which is critical for my objective. Your feedback and comments will be greatly appreciated.

1 - How many simultaneous master-slave connections are supported by the stack?

2 - Is peripheral-to-central and central-to-peripheral role changes supported? Can these role changes be performed without power cycling or resetting the stack?

3 - If role switching is supported without power cycling or resetting the device, how fast does this role switching take place in milliseconds?

4 - Does the stack support combined roles such as "central scanner" and "peripheral broadcaster"? What I mean by a combined role is as follows:

4.1. central scanner: While the central device is connected to one or more slaves, it is able to perform scanning other devices around it without aborting its existing connections.

4.2. peripheral broadcaster: While a peripheral device is connected to a central device, it is still able to broadcast to other devices around it without disconnecting. (However, no new connections to this peripheral device can be made)

5 - What is thefootprint of TI's stack in terms of RAM and Flash?

Kind regards...

cc2540 rssi to dbm

1071236 — Thu, 13 Oct 2011 14:42:11 GMT

Dear,

When i read out the data (Bluetooth low energy) from the cc2540 with the packetsnifer i get this:

Packet index: 5
Length: 48
Raw data (hex): D6 BE 89 8E 00 25 30 B2 00 FF EE CC 02 01 06 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 92 E2 95 3A A5
RSSI [dBm]: -36
CRC OK: 1

I assume 3A is the rssi value.

Know my question is how i can convert this to a dbm value. Normally this should be -36dBm.

Thanks in advance,

Davy

Creating events in CC2540

Artem Rodionov — Tue, 21 May 2013 15:17:11 GMT

Hello,

I am using CC2540 device for communication with iOS device. I develop my code from Keyfobdemo application.

I have some issues with new implemented events. Is there some limitation for adding new events created by user? There is the function KeyFobApp_ProcessEvents in the file keyfobdemo.c that works like a task for processing the events. So i understood from the datasheet that I can add new event by declaring it in the file keyfobdemo.h and by adding code like this in that function.

if ( events & MY_EVT )

{

//body

return ( events ^ MU_EVT )

}

Do I need to do something else to make the event working after calling it with osal_start_timerEx function?? I think not but the problem is that when I create event like this it is not working. I create event that should call some alert. I call the event exactly from the part of code where the alert call was originally. Before the alert worked, now its not working. I have no idea about it. It is very strange behaviour. I am sure I dont have two events with the same ID.

Thank you for any help.

Artem

L2CAP packet sent several times

Gregory POIRIER — Tue, 21 May 2013 10:16:51 GMT

Hi,

I am using the SensorTag hardware with the sample SensorTag application modified with the Data throughput examples:

http://processors.wiki.ti.com/index.php/CC2540_Data_Throughput

I am sniffing the BLE packets with TI's SmartRF packet sniffer.

The setup is then:

- 1 SensorTag as BLE peripheral

- 1 CC2540 USB dongle as BLE Central

- 1 CC2540 USB dongle as sniffer

During the transfer, I can that L2CAP packets are transmitted several times (0x1EE data packet in next picture) without seeing any problem in the packets. Can anybody explain me why these packets are retransmitted?

Best regards,

Greg

Extra sensors on CC2541DK SensorTag

Pau Ceano-Vivas — Tue, 21 May 2013 11:27:06 GMT

Hi,

I'd like to add some sensors to the CC2541DK SensorTag. I've seen there are 6 connectors under the battery but I cannot find documentation on them. Are they connected to free I/O pins of the processor? If not do you have any kit to do that? If it is possible to do it I would appreciate a sample circuit and characteristics of the sensors.

Thanks very much,

Pau

Heart rate collector. CC2540

Denis Katasonov — Mon, 20 May 2013 06:21:38 GMT

Hello.

I have "alpha mio" watch with heart rate function. This device implements BLE and heart rate service. As i understood heart rate service suggests using notification. I have two questions:

1. How receive a notification using simpleBLECentral.

2. Does anyone use heart rate service? My cc2540 found this watch, connect to it, but i can't find hadle.

Br.

Sensor Tag Released

Joakim Lindh — Wed, 07 Nov 2012 10:14:48 GMT

The SensorTag is now released. This is a $25 development kit and reference design for Bluetooth low energy sensor applications. This is the first Bluetooth low energy development kit focusing on wireless sensor applications and it is the only development kit targeting smartphone app developers.

NO embedded software design knowledge required
NO embedded compiler required
iOS sample apps are included to demonstrate use of the sensors(Android sample apps are coming when Android releases an Bluetooth 4.0 API)

The SensorTag includes the following sensors

Contactless IR temperature sensor (Texas Instruments TMP006)
Humidity Sensor (Sensirion SHT21)
Gyroscope (Invensense IMU-3000)
Accelerometer (Kionix KTXJ9)
Magnetometer (Freescale MAG3110)
Barometric pressure sensor (Epcos T5400)

For more information, please see:

http://www.ti.com/sensortag

SensorTag Wiki:

www.ti.com/SensorTag-wiki

SensorTag videos:

SensorTag intro and how to use one of TIs most popular tool

Order the SensorTag here.

Best Regards

Current Consumption CC2540

Andreas Andreas — Fri, 10 May 2013 06:52:09 GMT

Hi all,

i have a question about the current consumption of the CC2540 SOC.
The Datasheet says, that the IC needs 0,4 µA in Deepsleep (PM3).
The problem ist, if i use the "CC2541_43_44_45_Peripherals_Software_Examples" i will measure a current consumption of 0,47 mA (see attached picture).
Why is the current consumption much higher than the declaration in the datasheet?
I deaktivated the whole peripherie (jumpers on SmartRF05EB board).
I am measuring the current consumption on P15 V_EM.

What is the reason for the higher consumption?

Large unexplained constant current from the CC2564-PAN1326

Andrew Balmos — Sun, 19 May 2013 06:03:15 GMT

We are having trouble explaining a roughly 6 mA, what appears to be DC, current draw from the CC2564-PAN1326 in our custom designs and we are hoping the community may have some ideas to help us debug. We have made several breakout boards that allow us to breadboard the part for testing purposes as well as a custom PCB design. We see the same problem (plus or minus a few mA) for all the breakout boards as well as the custom design. The current flows no matter what state the Bluetooth chip is in. We even see the unexplained current when there is nothing but the CC2564-PAN1326 powered and held in reset. The interesting part is that the chip works perfectly and can communicate with others without problem.

Above is an oscilloscope plot showing the current draw of a GATT Read request. Channel 3 (blue line) shows the output of an INA210, which is amplifying the voltage drop across a .47 Ohm shunt resistor between the power supply and the CC2564-PAN1326. Channel 1 (yellow line) is measuring the reference voltage of the INA210. As suggested by the datasheet to help keep the INA210 in a linear region for small currents the reference is set to Vcc and the shut resistor connected in reverse, therefore the one must take Vcc - Vout to get the real amplified signal. The pink line is a MATH trace which takes Vcc-Vout and scales the voltage to directly read off the current in the shunt resistor. The cursor measurements on the right hand side of the screen are given in mV; however, because of the MATH they should be interpreted as mA.

As you can see with cursor Y2, the sleep mode current is roughly 6.125 mA when we were expecting a current in the microamps. Also notice the current drawn during the Read request is offset by the 6.125 mA. As said before, this 6.125 mA is seen flowing even when the chip is held in reset. To make sure the problem was not caused by the current measurement setup we verified the average current draw from the built-in ammeter of the power supply with the INA210 and shunt resistor removed.

It seems unlikely, but does anyone know if this is a known problem? If not, then our working theory is that we are somehow consistently damaging the chip. To do the soldering we use a hot plate with two different temperature zones. We try to follow the heating curves in the CC2564-PAN1326 datasheet as best as possible; however, there is only so much control one has with a hot plate. Is it possible that overheating or incorrect heating could cause this type of problem? If we have solder joints under the chip does it seem reasonable that we would only have 6 mA of current?

Thank you for any help or thoughts you can offer.

Andrew

about mobile phone connectivity with bluetooth module

Nirav Patel1 — Tue, 21 May 2013 04:08:50 GMT

HELLO to all,

I am new to this bluetooth kit (CC2540MINI)...i want to buy this kit..but i want this kit to connect with my anroid smart phone via bluetooth..so is it possible to do so??
because they haven't discussed about it..so please tell me how can i connect it..

Using SensorTag on iOS Simulator

GammaPoint — Tue, 21 May 2013 01:32:22 GMT

I tried to follow the instructions on Testing Core Bluetooth Applications in the iOS Simulator

But unable to turn on Bluetooth on iOS simulator.

I am using the CC2540 USB Dongle from TI.

I know I can test the code on iPhone4S or 5 but it would be much faster if I can get the iOS simulator working. May be someone at TI already tried this and would be able to help.

I will post this in Apple Dev forum too.

Could I define both HAL_UART_SPI 2 and HAL_SPI_MASTER?

He Landao — Tue, 21 May 2013 02:58:28 GMT

Hi all

In __HAL_UART_SPI.c ,I find the defination following :

#if ((HAL_UART_SPI == 1) || defined HAL_SPI_MASTER)

#define PxDIR P1DIR

#define SPI_RDYOut P1_4

#define SPI_RDYOut_BIT BV(4)

#elif (HAL_UART_SPI == 2)

#define PxDIR P0DIR

#define SPI_RDYOut P0_5

#define SPI_RDYOut_BIT BV(5)

#endif

It mean that I can not define HAL_UART_SPI=2 and HAL_SPI_MASTER at the same time?

Thanks .

landao

how to use HAL_UART_SPI ??

He Landao — Mon, 20 May 2013 08:31:01 GMT

Hi All,

In the HAL,I can find the driver of SPI Vai UART interface.

I try to read and write the flash(W25Q32) with SPI .When I enable the master mode,and My app

stop at the end of halSetSleepMode().

Is there some demo about using HAL_UART_SPI ?

Thanks.

Landao

interrupt skip questions.

jin kwang hen — Mon, 20 May 2013 11:16:50 GMT

HI TI.

interrupt skip questions.

The CC2541F256 used to dimming control(in order to ZeroCross Detect P2_0 Port used).

S1. Problems Skipping that periodically Port P2_0 Interrupt. (See attached image).

http://SeaGenTech.ipdisk.co.kr:80/publist/HDD1/IAR/Skip_Interrupt.png

S2. OSAL routine disables master interrupts caused by frequent within. (EA='0').

S3. This is caused by the HAL_ENTER_CRITICAL_SECTION() macro, which is used frequently.

(osal.c, osal_memory,c, osal_pwrmgr.c, osal_timer.c) files in the call, see below.

--------------------------------------------------------+------------+----------------------------------------------------------

File Name | Line No | Founction Name

--------------------------------------------------------+------------+----------------------------------------------------------

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL.c 600 HAL_ENTER_CRITICAL_SECTION(intState);

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL.c 676 HAL_ENTER_CRITICAL_SECTION(intState); // Hold off interrupts.

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL.c 714 HAL_ENTER_CRITICAL_SECTION(intState);

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL.c 752 HAL_ENTER_CRITICAL_SECTION(intState);

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL.c 787 HAL_ENTER_CRITICAL_SECTION(intState);

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL.c 816 HAL_ENTER_CRITICAL_SECTION(intState);

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL.c 856 HAL_ENTER_CRITICAL_SECTION(intState);

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL.c 907 HAL_ENTER_CRITICAL_SECTION(intState); // Hold off interrupts

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL.c 936 HAL_ENTER_CRITICAL_SECTION(intState); // Hold off interrupts

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL.c 1123 HAL_ENTER_CRITICAL_SECTION(intState);

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL.c 1132 HAL_ENTER_CRITICAL_SECTION(intState);

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL_Memory.c 287 HAL_ENTER_CRITICAL_SECTION(intState); // Hold off interrupts.

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL_Memory.c 343 HAL_ENTER_CRITICAL_SECTION( intState ); // Hold off interrupts.

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL_Memory.c 530 HAL_ENTER_CRITICAL_SECTION( intState ); // Hold off interrupts.

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL_PwrMgr.c 177 HAL_ENTER_CRITICAL_SECTION( intState );

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL_Timers.c 264 HAL_ENTER_CRITICAL_SECTION( intState ); // Hold off interrupts.

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL_Timers.c 294 HAL_ENTER_CRITICAL_SECTION( intState ); // Hold off interrupts.

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL_Timers.c 328 HAL_ENTER_CRITICAL_SECTION( intState ); // Hold off interrupts.

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL_Timers.c 358 HAL_ENTER_CRITICAL_SECTION( intState ); // Hold off interrupts.

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL_Timers.c 387 HAL_ENTER_CRITICAL_SECTION( intState ); // Hold off interrupts.

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL_Timers.c 422 HAL_ENTER_CRITICAL_SECTION( intState ); // Hold off interrupts.

G:\BLE-CC254x-1.3.1\Components\osal\common\OSAL_Timers.c 439 HAL_ENTER_CRITICAL_SECTION( intState ); // Hold off interrupts.

--------------------------------------------------------+------------+----------------------------------------------------------

In order to solve the above problem.

I want to change from Master Interrupt(EA=0) to Individual_interrupt(IEN0,1,2 Control).

Questions in order to save time.

Matters to consider on a priority basis when changing from S3, should be (Review) (Line No.)?

Current profile roll PERIPHERAL_CFG,.

Please let us know if you good feedback.

Why no TI employee answer my question???

Jun Feng Hu — Tue, 21 May 2013 02:15:20 GMT

I am from Shanghai company.

I debugged Keyfob and my product SmartWallit.

But i found if i update connection parameter to min=400,max=800,latency=0, timeout=600, the connection between iphone5(6.1.3) and keyfob will be lost.

So i bought every TI product from chinese market as possible as i can.

I tested them.

I found the same problem

So i definitely sure that TI's protocol has some bugs when it communicates with iphone5(6.1.3).

To:Any TI employee

please try my test as following ways:

I used TI's stack 1.3.1 and download it to key fob.

Then i only change connection parameter to min=400,max=800,latency=0, timeout=600.

Keyfob can connect with iphone5 but it will lose connection with iphone5 some time later.

So anyone can test it.

Please help me.

Question about programing CC2541

Eyal Meir — Mon, 20 May 2013 22:25:09 GMT

Hi,

I am looking for a low power consumption development board based on Bluetooth / BLE and microcontroller.

My target is to have the ability to transfer data from mobile (iPhone/android) devices to a microcontroller and back via Bluetooth or BLE.
( we only need to transfer a byte of data from the mobile to the microcontroller, one every few seconds and return an acknowledge).

According to the data sent from the Bluetooth on the mobile to our Bluetooth, I only plan to activate LEDs as outputs pin.
- Can we do it with the microcontroller inside CC2541 ?
- Does the CC2541DK-MINI Can act as a receiver?
- Data will be send from Andoid/Iphone.
- Does the CC2541 can be program for the outputs according to received data from mobile via BLE?
- Which profiles I can use with Iphone/Ipad without MFI approval?

Thanks,
Eyal

CC2540 ADC sampling while transmitting

Yadid Ayzenberg — Fri, 22 Mar 2013 18:49:49 GMT

Hi,

Im sampling a signal using the ADC at a rate of 300Hz (and is triggered by a timer). The samples are copied by DMA and I receive an interrupt every 10 samples. At that point, I transmit the data.

Is there a way to synchronize between the ADC and the transmission ? as the ADC is sampling at a fixed rate, im assuming that the OS may decide to transmit exactly in the middle of a sample.

Is there any way to prevent the cc2540 to transmit while an ADC sample is progress ? I am experiencing errors while sampling an there is a transmission in progress.

Or is there a way to flush the transmission buffer so that it will transmit immediatly, rather than wait for packets to be accumulated?

Thanks,

Yadid

Which of the several Bluetooth LE modules should I consider to use with the Experimenters Board - MSP430F5438A?

tomatelectrosoft — Sat, 18 May 2013 16:32:42 GMT

Hello to all,

My request is for some comments and suggestions about “which of the Bluetooth modules” and
“the assocaited development system” should I be using to develop the Bluetooth communications between
my customer’s system and an iPhone or iPad or iPadmini. I believe that I should focus on the Bluetooth low energy
modules because it is easier to create an APP that Apple will allow on the iStore.

The customer wants to reprogram his system in the field by use of iPhone/iPad. When reprogramming,
the system will be 10 to 20 feet away from my customer who will be holding his iPhone or iPad.

This process is expected to take only a few minutes but may be repeated within an hour or two.

My customer has wanted me to use the MSP430 microcontroller for updating his system with a new
printed circuit board. It’s early in this project, so I want to get some indication as to how to design-in the
Bluetooth module; what is its size, and electrical current needs, etc.

Please provide references, hyperlinks, distributors and other resources that might help me, as soon
as possible.

Thank you very much!

Thomas A. Roman, P.E.
EE Design Consultant
ElectroSoft Engineering, Inc.
2500 Highway 88, Suite 210
St. Anthony, MN 55418
612-781-2723
engineer@iwe.us.com

about cc2541 for HID example

lee shaw wei — Mon, 13 May 2013 03:42:54 GMT

hi every friends,

i have a question about the cc2541 for hid example:

i have see the profile:

http://www.ti.com/lit/ug/swru271e/swru271e.pdf

and i have that :

The HidAdvRemote Project has been added. This implements a full mouse-like
pointing functionality using motion and gesture control. The project runs on
the CC2541 BLE Advanced Control included as part of the CC2541DK-REMOTE kit.
The application implements the HID-over-GATT (HOGP) profile with a report
descriptor supporting the keyboard, mouse, and consumer control classes of
HID devices.

my question is :

1. where could i find the cc2541's hid example > HidAdvRemote ?

2. The "HidAdvRemote" could program on the cc2540 ? ( because i have buy cc2540 develop kit )

thanks,

SensorTag on iOS times out after 15-30 minutes

Trevor Harmon — Mon, 29 Apr 2013 23:55:10 GMT

Hi,

Using the SensorTagEX demo code as a guide, I've written a simple iOS 6 app that receives temperature data from the SensorTag. I use bluetooth-central to allow the app to communicate with the SensorTag while in the background. This all works fine, but after about 15 to 30 minutes, the connection drops, and there is an error (from Core Bluetooth) about a connection timeout. At this point the SensorTag apparently stops sending advertising packets, since my app can no longer discover it when scanning. If I push the button on the side of the SensorTag, it begins advertising again and my app can connect. I've run several experiments, always with the same result: My app simply can't maintain a connection to the SensorTag for more than 30 minutes or so, even though the two devices are sitting right next to each other. Any thoughts? Thanks,

Trevor

CC2540/41 BLE compatibility

Yuri Danilov — Fri, 17 May 2013 19:38:52 GMT

Hello.

Is the CC2540/41 BLE RF compatible with any BlueTooth V4.0 PC dongle ?

Regarding specification of Galaxy S III the smartphone have BlueTooth V4 .

Is the CC2541 will work with the smartphone Galaxy S III ?

Have some one any suggestions or links to source code for Android ?

CC2540 USB CDC Interface in CodeSize Limited IAR Workbench possible?

McTen — Sun, 19 May 2013 10:15:47 GMT

Hi there,

is it possible to implement a USB CDC interface in the USB Dongle without BLE&OSAL in the codesize limited IAR Workbench environment?

- Using the codesize limited evaluation verison of the IAR Embedded Workbench

- No BLE connection necessary

- Using USB CDC as a debug interface

In a first step, I want to use my hardware without Bluetooth - Bluetooth will be a nice to have feature. Since I am a hobbyist, I use the codesize limited version of the Embedded Workbench, so I am searching for an USB CDC example that is usable with the codesize limited version. Has anybody done this and can provide me an example code?

Thanks in advance & kind regards,

McTen

Use of indication in keyfob with cc2540minidk

Jordi S��nchez — Mon, 20 May 2013 10:53:30 GMT

Hello all,

I´m using the keifob demo profiles. After collecting data from accelerometer I want to send them to the usb dongle and monitoring with btool. I want to use indication for this but i don´t understand very well this function. At this moment, I can send one data and see it with btool but I can´t send more than one data.

When I send an indication, does usb dongle send a confirmation to the cc2540 automatically?

Thanks for your attention,