# 1,371 questions

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## Phone disconnect nrf51822 immediately

Hi guys

I want connect nrf51822 (Raytac MDBT40) by my phone(HTC battery one android 4.4.2).

I use softdevice 130(ver.2.0.0) and SDK 11 demo code under KEIL ARM 5. (Nordic Semiconductor\nRF5_SDK_11.0.0_89a8197 ... (more)

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## Sometimes the android app(especially vivo phone)can not scan the device

The vivo phone sometimes cannot scan the device, There are two devices embedded same program. However,one of them can be scanned,the other one can not. The advertising packet shows as follows:

I can not find the wide difference ... (more)

51
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## SPI manager queue limitations

Hi all,

Having a bit of an issue with the SPI manager scheduler. When sending small packets (<4 bytes), I seem to be able to queue as many requests as I want.

However, sending a larger packet - even without any ... (more)

44
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2
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## Bonding information lost after DFU OTA update SDK 10.0 SD 8.0

Hi,

We are currently facing this issue, where after a DFU application firmware update (or bootloader update) the bonding information gets wiped out.

We are using a custom board as peripheral based on NRF51822, with Soft Device S110 8.0 ... (more)

32
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3
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## How to measure centre frequency on the nRF52832 ?

Hi,

I am using the nRF52832 and I have been trying to meausre the centre frquency on a specturm analyser. But, the centre freq on the specrum analyser is 1.81GHz when it is supposed to be about 2.4GHz ... (more)

66
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## How to change the data type from integer to floating point so i can read floating ponit voltages on copper coap?

I have an iot/coap environment setup and i want to read input voltage connected to p0.01.I can read the input in terms of resolution(0-1023).I can convert this values to voltage(0-3).I want to read ... (more)

76
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1
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1

## BLE Advertising, a beginner's tutorial [closed]

Hello everyone,

Lately I have been struggling while trying to run "BLE Advertising, a beginner's tutorial". My hardware consists of NRF51822 and PCA1000 dongle. I use SDK_11.0.0 and the example provided at github https://github.com/NordicSemiconducto ... (more)

67
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1

Hello

I am building bootloader. I do not use Softdevice and used example from this topic. Bootloader must read FW from uSD card, update flash and jump to application. uSD card is connected to SPI0 of nrf51. SPI1 is used ... (more)

52
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## Sending Char Data via BLE w/MPU6050-nRF51822

EDIT: I used a workaround to get my project working but my question still remains. I just used the template project to send data to my app and manipulated the received data inside the app. I must say I was ...

(more)

51
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2

## Connectable ble Beacon data advertising

I need to add connectable beacon advertising data instead of normal advertising for proximity profile example (NRF52 DK -> PCA10040 ->S132 -> nrf52832).During Advertisement it should show beacon data and in connected state it should stop.

I tried of doing ,but ... (more)

69
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## Tx power Beacon and NRF52

Hi,

I want to know Tx power and duty cycle information of Beacon and NRF52 for the following cases:

In our case NRF52 will be our receiver and Beacon will be transmitter.

Consider NRF52 as an master and beacon as ... (more)

59
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1
vote
1

## Timer interrupt don't work in ble_app_uart of SDK6.1.0

Hello everybody

I am working with the Raytac BLE Module "MDBT40", which is based on nrf51822.

And I am testing example project "ble_app_uart" in the SDK6.1.0 now.

But there are some problems when I add a new timer ... (more)

26
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## making Tune instead of Beep using Bizzer with PWM library

i have added pwm into proximity profile example and now i am able to make beep using buzzer with pwm library.Now i want to make some sort of Tune instead of beep.

Can any one help!....Thanks.

1k
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1
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5

## File name too long

Hello: When I try to open an example project from nordik, keil doesn't open some files and I get the following error: "no source": Error: #5: cannot open source input file "............\components\serialization\connectivity\codecs\s130\serializers\ble_gatts_evt_rw_authorize_request.c ... (more)

106
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## Use C++ with Nordic SDK (nRF52 series)

Hi, i wrote a lot of firmwares for nRF51x22 using C language and they works fine. Now we passed to nRF52 series and we want to use C++ (preferibly C++11) that is more readable, ordered etc... but i got ... (more)

23
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## Single and dual bank DFU all failed over RedMi Note3 Phone

Firstly，the RedMi Note3 DFU failed used by dual bank，however Xiaomi3 Phone can DFU successfully.As the questionlink text mentioned,the process of the RedMi Notes3 Phone DFU stopped at the line APP_SCHED_QUEUE_FULL(). The details over the OTA ... (more)

34
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1
vote
1

## Get "Trace Hw no present" on segger j-link

Hi guys

I am using customized board(Raytac MDBT40) based on nrf51822(flash memory 256k, RAM 32k).

I am trying BLE UART example code of SDK 11.

which path : \nRF5_SDK_11.0.0_89a8197\examples\ble_peripheral\ble_app_uart\pca10028\s130\arm5_no_packs

Now I ... (more)

22
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no
1

## gazell in more devices application

hi all:

I am a new user.Now i have a project in which I need to implement a function a host and four devices .I just want to know if i use the example of " gzp_dynamic_pairing " what do i ... (more)

41
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2
1

## Strange SPI clocking w/S140 (Update: S132 as well) enabled [closed]

I'm having a strange issue with getting SPI running through the transaction manager whilst running a S140 softdevice (SDK13 w/ nrf52840 5.0.0-2Alpha - I know there's a newer version but it's not being used just yet ... (more)

25
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## central discovery error

Hello,

I am currently working on a project involving the nRF52DK to be a central device.

The peripheral device is based on the Nordic Uart service with minor changes: UUID, access properties...

On the central side, I use ble_nus_c as ... (more)

23
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1

Hello,

When using hal_w2_read() and hal_w2_write(), should the 7 bit address of the slave be passed in or the 8 bit read/write address? It seems to me that passing in the 7 bit address works in hal_w2_write().

37
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1

## Using FPU of nrf 52

hello, I am using Keil's uVision 5 v 5.22. Please tell me how to enable FPU. thank you,

20
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2

## I cannot find ble_connectivity_s110_hci_pca10028

I have downloaded the nRF51 SDK from here https://www.nordicsemi.com/eng/Produc... and I'm trying to run HCI-UART examples as explained here https://developer.nordicsemi.com/nRF5...

Unfortunately the exampled mentioned on the tutorial is nowhere to ... (more)

78
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no
1

## Keil errors: Error instantiating RTE components Error #540: 'ARM::CMSIS:CORE:4.3.0' component is not available for target 'nrf51422_xxac'

I just bought the NRF51DK and going through this getting started guide: https://devzone.nordicsemi.com/tutori...

I opened the file ble_app_uart_pca10028_s130.uvprojx in folder ..\examples\ble_peripheral\ble_app_uart\pca10028\s130\arm5_no_packs of nRF5_SDK_12.2.0_f012efa

I opened the file in ... (more)

24
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no
1

## using pwm 1khz square wave generate with 50% duty cycle

i m new in nrf51822 controller so help me for coding of my question. any help will be appriciate. thank you.

68
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2
2

## malloc() causing HardFault

Hi,

I work on a project for the nRF52832 with Keil µVision using ARM Compiler V5.06 update 2 and nRF5 SDK 11.

In a module I allocate quite some memory using malloc() for signal processing (SP). Upon user request ... (more)

33
views
1
vote
1

## ArmClang error (cannot specify -o)

Hello,

I am trying to move from ARM Compiler v5.06 to v6.4, but I encounter an error, which I cannot handle.

The project builds fine with v5.06. When changing to v6.4 in Keil µVision and hitting ... (more)

45
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## Can anybody provide me a text file of BLE advertised packets generated by nrf51822 in wireshark or elsewhere?

Can anybody send me a text file of BLE advertised packets generated by nrf51822. this is my email sofimukhtar1@gmail.com.. i'll be very gratefull

173
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1
vote
2

## Broken NUS after iOS 10 upgrade

After upgrading to iOS 10, I have been unable to successfully interact with my device using the NUS. I used to use the NUS to communication with the device and retrieve stats. For example, I would send a "T" message ... (more)

91
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1

## How to install NRFGO studio along with its other tools?

I am working on a BLE project, n i have bought nrf51822 BLE nano chip. but honestly speaking i got stuck in installation itself. i have tried the blinky, HRM examples given by MBED and they work fine. But while ... (more)

#### Statistics

• Total users: 18588
• Latest user: Lucia Doran
• Resolved questions: 9213
• Total questions: 21765

## Recent blog posts

Posted 2017-04-11 11:49:17 by Radosław Koppel
• ### Taking a deeper dive into Bluetooth 5

Posted 2017-04-07 14:53:51 by John Leonard
• ### Logging enabled by default in SDK Bluetooth examples

Posted 2017-03-29 11:27:02 by Håvard
• ### Monitor Mode Debugging with J-Link and GDB/Eclipse

Posted 2017-03-29 05:56:12 by Daniel Veilleux
• ### Getting started with Nordic's Secure DFU bootloader, a step by step guide

Posted 2017-03-20 17:13:52 by Hung Bui

## Recent questions

• ### Is it possible to use Nordic SDK with Arduino?

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