# 13,702 questions

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## how can I implement whitelist sdk 10

im trying to get my nrf51822 connecting only to my phone, I set the phone mac address on white list, but I cant see the advertiser on my phone (android) wiht nrf master control. How can I set only the ... (more)

32
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3
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## [DCC pin nrf52]

Hi all,

it's possible to use a DCC pin to power an external element (like a led, for example)? If, yes what is the maximum voltage that we can have? It's V battery or greater?

Thank you, Anna

54
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2

## Can we have one application to Modify both iBeacon and EddyStone properties?

Can we have one application to Modify both iBeacon and EddyStone properties? (App development in Android)

Greetings, Will we be able to support a modify beacon props of iBeacon and Eddystone in the same app ? nRF for EddyStone app scan ... (more)

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## ble central is not working after removing power_manage();

hi, I'm using ble central example using S130 softdevice. It works fine without editing anything. In my application, I dont want to put the nrf51822 to System On low power mode, so I removed the power_manage() function. But now ... (more)

33
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1
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## all SVCALLs spin after updating to SDK11

when upgrading from SDK8 to SDK11 every SVCALL to the softdevice now just jumps to the application's weak SVC_handler and "B ." spins.

I can make a main.c file with only this in it and it still happens:

int ... (more)

9
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Hi,

I'm developing a hid keyboard + lbs(led button) application, in my design there're several primary services and each with different characteristic(with read/write notification), when the button is pressed, a notify of the button status is ... (more)

26
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1
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## How to deal with broadcasting collision?

I have 500 nrf51822 devices, when I use Master Control panel to scan twice, the first time I can scan device A, the second time I can not scan out device A. I google find out that,broadcast channel is ... (more)

22
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## Problems with the db discovery module

Hi everybody.

I am opening a dedicate question after a recent topic that already helped me a lot, with another discussion pretty similar to my problem. Resuming briefly, i have two nordic devices, a smart beacon kit (SDK 7.1 ... (more)

30
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1
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## nRF52 RTT debug problem

I'm developing an embedded application using the nRF52 device. I am using GCC to build the C software and a segger flash device to program the nRF52, all using linux. I wish to generate debug information during the execution ... (more)

240
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## DFU not working hrs_freeRtos w/ log

Log 2016-03-08 155036.txtLog 2016-02-10 17:56:38.txtPorted DFU to hrs using FreeRtos and I keep getting GATT ERROR after the image file is opened.

Looked at the DFU how to port. Looked at the ANCS & DFU ... (more)

23
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## what is the switching time between RX ShockBurst and STBY mode?

Hi,

I would like to know what is the switching time between RX ShockBurst and STBY mode? In documentation I can only find switching time between STBY -> RX ShockBurst not the other way around.

Cheers, Karolina

39
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## differences between the nRF52-DK and the Preview DK?

Hello!

What are the differences between the nRF52-DK and the Preview DK? I have heard that there is an error with the RAM: https://devzone.nordicsemi.com/questi...

Are there any more problems with the Preview DK?

Thanks!

56
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2
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## [SOLVED] nRF52: sd_app_evt_wait() will not go to sleep

I'm having a strange problem, where sd_app_evt_wait() won't make the CPU sleep, after I've started a app_timer (consuming >2mA). Its working perfectly before I've started it, only dragging around ~1uA.

Im using the nRF5 11.0 ... (more)

19
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## using i2c to send 3 command per 10ms, ppi available?

just like https://github.com/Martinsbl/nrf5-mpu... we add a sensor, and try to read 2 sensors by 3 command in i2c. is it possible to still using ppi?

4
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## nrf24l01+ antenna modification

how do I modify antenna of nrf24l01+ by connecting external smt antenna to it? for this purpose I need rf ground and antenna core, I can't find rf gnd here. is that same as electrical ground. is it possible ... (more)

21
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## Bluetooth Continua

We are developing a blood glucose meter based on the nRF51. To comply with Bluetooth Continua, do we just implement the Glucose Profile and Service (GLP and GLS)? Do you have any examples?

11
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## S110 HID read datas from smartphone

Hi,

I use HID application with S110 v8.0 profil.

I use BLE HID Keyboard example. I put datas from smartphone to BOOT KEYBOARD OUTPUT REPORT and I whant read them by interruption.

How can I create this interruption

BEst regards

54
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## nRF SDK5 11.0.0: blinky example with NRF_LOG problem compiling

I'm using the nRF SDK5 v11.0.0. I'm trying to test out UART Logging in the simple blinky example bundled in the SDK. I added NRF_LOG_INIT() and then a NRF_LOG("Testing\n"); in main(). Naturally i added ... (more)

37
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## Any workaround for master control panel silently exit

Master Control Panel occasionally works for me, but at other times it will never launch. I click on the app, something seems to happen but the window never appears. I tried running from the command line and it runs for ... (more)

17
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## Master Emulator go crazy after a connect fail

Hi,

I'm using the Master Emulator DLL to build a VB, everything seems go fine. However I found that if there's a device discovered but fail to connect by some result (eg. if the device just shut off ... (more)

52
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2

## Best way to send raw data to computer

Hi,

I'm looking for an easy way to send raw data measured by NRF51822 (as single bytes) to a host computer, without using Nordic dongle. The example project ble_app_uart would be perfect if there was a way to send ... (more)

820
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## Tutorials[Meta]

Hi,

We're working on making some more tutorials, we have some thoughts on what we want to do, but we would really like your input. After all it's you, the user, who will benefit from this material.

What ... (more)

42
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1
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2

## ble device not visible

I have a recent dev board and am using SDK11 with gcc. I can build and flash OK The blinky sketch runs However, when I load up examples/ble_peripheral/ble_app_proximity/pca10040/s132/armgcc and issue "make flash_softdevice" I get what ... (more)

20
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## BLE_GAP_SEC_STATUS_UNSPECIFIED in bonding

Hi, I developed an application with Nrf51822 with some bonding need. No problem with android or using the dongle, but using iOs systems it happens that after a random attempt's number the bond with pin code fails, and there ... (more)

23
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## nrf51 does not work outside debug

The app doesn't run when i flash the hex file. However it does run in debug.. I use embedded studio in OS X and nrf51 DK. I added STARTUP_FROM_RESET to preprocessor definitions.

685
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2

## Segger Embedded Studio -UNPLACED_SECTIONS' problem

Hello,

I try to start developing my nrf51/nrf52 projects using Segger Embedded Studio but each time I receive the same linker error:

"(...) section fs_data' will not fit in regionUNPLACED_SECTIONS'"

In my case fds.c or fstorage.c is ... (more)

20
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## Example Project building error in Keil.

I am trying to run one of the examples in the SDK (...\nRF5_SDK_11.0.0_89a8197\examples\peripheral\blinky\pca10028\s130\arm4) with the name "blinky_s130_pca10028" but its not building and give some errors once i click on build. I am ... (more)

28
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3
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## fstorage memory allocation in Segger Embedded Studio

On fds_init() I am getting back an "Invalid Data" error code and I'm not sure why.

This is on pca10040, SDK11 and S132 v 2.0

I lifted the example mentioned here -> https://devzone.nordicsemi.com/questi... and put ... (more)

15
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## error with char array in nRF51-DK an mbed

Hi all,

I am using mbed for developing on nRF51-DK. The code has an initialization of a character array as follows: char tmpbuff[80];

The code compiles and when loaded into the board, it crashes (I can see that by ... (more)

17
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## flush out existing used pipe for reuse in nRF8001 in pic18f?

Hi Guys, I have some sensor data of 20 bytes at each measurement at different period stored in EEPROM. Now i have to transmit all data over BLE continously.

example : say 20 bytes of data at 7 different time period ... (more)

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• Total users: 11673
• Resolved questions: 6110
• Total questions: 13702

## Recent blog posts

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Posted 2016-05-06 02:14:45 by eric ely
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• ### BBC micro:bit rolling out now!

Posted 2016-04-16 10:09:34 by John Leonard
• ### Fast Updates of User Code on nrf51822 with bluz

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## Recent questions

• ### ble central is not working after removing power_manage();

Posted 2016-05-06 12:39:15 by Amit Varshney