# 26,144 questions

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## nRF51822 receiving range problem. Transmit range is good however. Using micro ESB proprietary library.

Hello, We developed a few devices using the nRF51822 and noticed that the receiving range is reduced significantly from our nRF24L01 devices. The transmission range is good however. We are using the micro ESB libraries with no soft devices, and ... (more)

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## BLE UART - ble_nus_string_send() connection interval & data transfer

Hey guys,

From what I understand, the minimum connection interval on say, an iPhone, is 20ms. Also, you can send up to 6 packets of 20 bytes within a connection interval. So that's 120 bytes every 20ms.

I've ... (more)

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## BLE App UART on PCA10056 not working?

I'm using the original BLE App UART from nRF5_SDK_14.0.0 on a PCA10056 Board. The board is advertising, but if I want to open a BLE peer-to-peer connection, than the application stops in the app_error_fault_handler.

If i use ... (more)

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## Connectable range is equal to the range that the smartphone is able to get advertising?

It's kind of relative question with my previous question. "When smartphone range is shorter than a peripheral(nRF5X), is there any way to receive an advertisement from the peripheral?" https://devzone.nordicsemi.com/questi...

• test device : nRF51822 / iPhone 5 ...

(more)

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## How to change Characteristic UUID?

Hi. I'm using nRF51822 as Peripheral.

To init the service for example "NUS", i have to call NUS_BASE_UUID as below.. #define NUS_BASE_UUID {{0x9E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x00, 0x00, 0x40, 0x6E}} /**< Used ... (more)

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## Mesh SDK Beacon example not working?

I have problems getting the beacon example in the new mesh SDK v0.10.0 working. I invoke cmake with this command:

cmake -DTOOLCHAIN=gccarmemb -DPLATFORM=nrf51422_xxAC -DBOARD=pca10028 -DSOFTDEVICE=s130_2.0.1 ..


And program the device with these commands ... (more)

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## Having trouble getting any gpio in examples to work?

I have the blinky examples working, but have not been able to get any example code using any gpio input to work. they compile fine but the buttons done seem to work. I'm using GCC compiler in Segger Embedded ... (more)

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## Weird definition of access_opcode_t?

When reading about access_opcode_t struct on its infocenter page it stumbled upon this table i don't understand.

access_opcode_t is defined as:

Data Fields
-------------------
uint16_t opcode
uint16_t company_id


And the table i don't understand looks like this:

+-----------+-----------+-----------+-----------------------------------------------------------------+
| Byte 0 ...
(more)

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## Errorcode: CouldNotFindJprogDLL (0x2)

I can't open a com port after starting the nRF Connect app. This happens in Windows (native) and also a Linux virtual host with the com port passed through. I'm using a nRF51 DK.

Unable to read connectivity ... (more)

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Should these beacons be advertising as bought off-the-shelf? I've got six and was expecting to be able to pick up their advertisements but I'm getting nothing.

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Hello! I try build example from new SDK 14.1.0 in Keil5.

29
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## PWM individual decoder not working

Hi all,

I have two pwm pins I would like to have them run at two different duty cycles. My understanding is that we can do this by setting the decoder to individual. When I set this register to individual ... (more)

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## Unit testing with Unity and SoftDevice

Hi,

I'm currently in the process of integrating unit testing into our firmware development process. I'm trying to execute on-target tests with the Unity test framework, using the Nordic-modified version provided in this post.

This has been working ... (more)

35
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## Storing many small blocks of data in FDS?

Hi All, We have a data logging application, where our typical data packet is small -- roughly 20 bytes. I've been experimenting with FDS for storage, with one record for each packet, and I'm getting my fds write calls ... (more)

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Hi Nordic forum.

We wanted to update the bootloader over the air. Initially, we had a very plain bootloader (the one provided in the example) but later we added a timer to reset to the application when no packets are ... (more)

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Hello,

I would like to make use of white list advertisment for my heart rate application on my nrf52832 s132 pca10040, currently I am using SDK12.2, is there some example provided on the SDK that handles/uses this functionality ... (more)

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## SDK_config.h inconsistencies

I just replaced SDK 14.0 with the shiny new SDK 14.1 in my project. My project uses components from the SDK, but I don't use the exact same structure. Once again, it won't compile out of ... (more)

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## Function execution when BLE_GAP_EVT_CONNECTED

Hello,

I am using ble_app_uart code. My first goal is to execute a function when board connects with an android device. Another goal is to disconnect board from an android device after information was sent. Moreover, to uninitialize radio, advertising ... (more)

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## S140 BLE config

I need some parameters of the BLE s140 stack for my project. Including duration of an advertisement event (beacon) and the maximum random slack for an advertisement.

I am not sure where can I find those things.

I am using ... (more)

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## Power Profiler Kit tremendous delay, what's going on?

Hello, I'm trying to measure the current profile with the PPK (HW Rev:1.1.0, SW: 1.1.0) but I see a lot of strange behaviors.

My firmware initializes everything and the waits a button event. When ... (more)

46
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## how to get data ADXL345 using nRF51822 via arduino IDE and mbed compiler

but that program can't get ADXL345 data, just UART nRF51. I've tried using nrf51822 too ... (more)

225
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## SVCALL warning messages

I've recently upgraded my IDE to use Crossworks v3.6.2 which uses a GCC ARM Embedded 4.9-2015-q3-update compiler. it has by default many of the code clean up featues turned on. it has found a great many ... (more)

47
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## nrf_log fixes in SDK14.1.0

I've noticed following line in SDK14.1 release notes:

 - Fixed a bug where nrf_log could crash when heavily loaded. 

I'm using SDK13.1 in my current project and I'm experiencing nrf_log related crashes under load as described ... (more)

32
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Hi, I use SDK13.1 FDS example and have some questions about that. Is there any influence about the lifetime of Flash when i use FDS function to write and delete the records.If it has,how to calculate the ... (more)

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## NFC_T4T_EVENT_NDEF_READ event not working every time

Hello,

i am working on an app using Android to read and write an NDEF record using SDK 14 type 4 tag.

I start the process by reading the record with the following Android sequence:

Ndef ndef = Ndef.get(mTag ...
(more)

18
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## Mystery that makes pairing impossible using DK 52(10040)

I repeated the Bluetooth pairing ON → OFF of my smartphone and DK 52 (PCA 10040 + HRM) and checked the connection, I encountered a mysterious phenomenon. HRM : heart_rate_demo.hex

1) It is a phenomenon that ... (more)

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## Questions about the Nor51822 BLE and PWM?

How do you do

Now use the Nordic \ nRF5_SDK_12 2.0 _f012efa \ examples \ ble_peripheral \ ble_app_uart this plus Nordic \ nRF5_SDK_12 2.0 _f012efa \ examples \ peripheral \ pwm_library this routine. 1. Only PWM operation, use the bluetooth connection will be disconnected after sending ... (more)

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But I simply cannot establish a SSH connection. Putty promts ... (more)

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## nRF5 SDK V14.1 IOT capabilities

Hi all,

I am currently building an app that does HTTP requests to Strava (https://strava.github.io/api/).

Before going deeper into the SDK, I would like to know if it will be able to handle the advanced authentication ... (more)

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## Minimum preamble length to receive packet on Coded PHY

Hi,

What is the minimum number of symbols in preamble nRF52840 has to receive in order to receive full packet on Coded PHY? I can see that it can easily receive packet with less than 80 symbols received, but don ... (more)

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## Recent blog posts

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## Recent questions

• ### nRF51822 receiving range problem. Transmit range is good however. Using micro ESB proprietary library.

Posted 2017-10-20 01:26:12 by Mahonroy
• ### Mesh SDK Beacon example not working?

Posted 2017-10-19 17:12:16 by SørenHN
• ### Weird definition of access_opcode_t?

Posted 2017-10-19 16:54:00 by SørenHN
• ### Errorcode: CouldNotFindJprogDLL (0x2)

Posted 2017-10-19 16:52:57 by alidaf