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23,073 questions

57k
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no
votes
2
answers
Last activity 2015-03-21 17:14:13 +0200 by winston

pulse sensor amped with RFduino doesn't work

hello, my name is alessio and i'm italian. I have got a problem with "RFduino" and the "pulse sensor amped" ( heart rate) . I downloaded the library of the sensor in the official site but when I compile the code ... (more)

47k
views
25
votes
1
answer
Last activity 2014-09-18 13:04:55 +0200 by Petter Myhre flag of Norway

Why do I get “Error: Flash download failed – Cortex-M0” when downloading a project from Keil? [closed]

When I try to download code to my nRF51822 from Keil, I get this error: “Error: Flash download failed – Cortex-M0”

What can I do about it?

45k
views
287
votes
3
answers
Last activity 2016-05-27 17:31:29 +0200 by Stefan Birnir Sverrisson flag of Iceland

How to minimize current consumption for BLE application on nRF51822 [closed]

How to minimize current consumption for BLE application on nRF51822

40k
views
47
votes
2
answers
Last activity 2015-07-01 03:17:15 +0200 by Pratyush Dave

What is connection parameters?

What are the connection parameters for a Bluetooth low energy link, and how do they affect performance?

38k
views
9
votes
5
answers
Last activity 2013-08-01 11:03:18 +0200 by Guest

Is there a serial port profile for BLE?

Is there any equivalent to the SPP profile from Bluetooth Classic? I've always used this as a way to transmit custom data using Bluetooth, but I can't seem to find anything equivalent for BLE.

36k
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4
votes
3
answers
Last activity 2015-07-03 11:26:22 +0200 by Petter Myhre flag of Norway

nRF52 SDK Installation

I want to evaluate the nRF52 SDK, but don't get how to install it.

The Getting Started section mentions an MDK installer. However, I cannot find any such installer inside the nRF52_SDK_0.9.0_0c82e3e.zip.

How can I install ... (more)

35k
views
48
votes
7
answers
Last activity 2016-03-25 17:31:49 +0200 by Chris Barratt

How do I calculate throughput for a BLE link?

How can I calculate the maximum throughput for an application running on the nRF51822 and the S110, when connecting to different kind of Central devices?

30k
views
3
votes
2
answers
Last activity 2013-10-03 13:42:55 +0200 by cocoa

BLE SIG Certification, Reference design to be used to obtain EPL

Hi, does anyone know if there is a document in which is explained, by Nordic, how to obtain a bluetooth certification using nRF51822 and S110 Stack ?

I know if a reference design is strictly followed the customer do not need ... (more)

27k
views
50
votes
2
answers
Last activity 2014-10-14 17:45:30 +0200 by Gigel

What is a client and server in BLE?

When working with BLE, one sees a lot of different names for roles, which is confusing. What is actually the difference between them all, master, slave, central, peripheral, client, server and so on?

24k
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answers
Last activity 2016-09-16 08:01:34 +0200 by Roger Clark

Can a code error prevent connection via SWD?

Is it possible that a crash in code can prevent connection by SWD to an nRF51822?

As I had an instance this morning, where after uploading, some code to a smart watch, I could no longer connect via SWD, and ... (more)

21k
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no
votes
1
answer
Last activity 2015-12-10 13:32:39 +0200 by Stanislav Silnitskiy

irk as the only security perimeter [closed]

Hello, Nordic!

In our entertainment project, nrf51 based devices exclusively utilizes either central or periph. role. All of them are headless (body mounted markers, etc). The environment is hostile (in the sense, that some cheater could spoof device address, advertising ... (more)

20k
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36
votes
9
answers
Last activity 2014-09-19 16:59:51 +0200 by John DeWitt flag of United States

dealing large data packet's through ble [closed]

Hi, I need to send(using BLE) large amount of data's, which are collected by the accelerometer sensor for 1 hour. I have an external NOR flash where the accelerometer data's are stored and from there data's ... (more)

20k
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32
votes
11
answers
Last activity 2015-11-07 14:17:19 +0200 by Tony

License for KEIL MDK is EXPENSIVE. Any way around??

I am starting my development work with Nordic Semiconductor nRF51822 Device and already purchased the Development kit. What i wanted to ask is do i need to purchase KEIL MDK 500 License to write my code/application? Because the Low ... (more)

17k
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no
votes
1
answer
Last activity 2015-11-12 10:47:57 +0200 by Petter Myhre flag of Norway

Nordic Devzone often very slow or unreachable

Hello,

lately I've often noticed problems while reaching nordic devzone, the server is often very slow and will sometimes not respond at all. Is it just me here in germany or does it happen for others too?

Marius

16k
views
44
votes
2
answers
Last activity 2014-10-16 10:33:31 +0200 by Stefan Birnir Sverrisson flag of Iceland

What low-frequency clock sources can I use?

When initializing the S110 softdevice, I can choose between the different clock sources as defined by the nrf_clock_lfclksrc_t enum:

/**@brief Possible lfclk oscillator sources. */
enum NRF_CLOCK_LFCLKSRCS
{
  NRF_CLOCK_LFCLKSRC_SYNTH_250_PPM,                       /**< LFCLK Synthesized from HFCLK.                    */
  NRF_CLOCK_LFCLKSRC_XTAL_500_PPM,                        /**< LFCLK crystal oscillator 500 PPM accuracy.       */
  NRF_CLOCK_LFCLKSRC_XTAL_250_PPM,                        /**< LFCLK ...
(more)

16k
views
2
votes
5
answers
Last activity 2015-09-16 20:46:47 +0200 by Solvarg

JLinkARM.dll is not correctly installed. Please run the nRF Tools installer to install the newest version. [closed]

I'm running nRFgo Studio on Windows 10. Have tried to re-install (nrfgostudio_win-32_1.21.0_installer.msi) without success.. Any idea what to do? Thanks!

15k
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no
votes
2
answers
Last activity 2013-10-26 15:50:40 +0200 by cocoa

S110 version 5.2 splitting using gcc objcopy. Programming failed at 0x10001010 [closed]

Hi 'Nordic' guys,

splitting the original S110 hex file provided by Nordic , version 5.2, there is an error extracting uicr section.

Now is only 20 bytes and not 32 as old version.

Jlink reports an error occurring at address ... (more)

15k
views
1
vote
1
answer
Last activity 2016-04-06 11:49:39 +0200 by Krzysztof Chruściński

Reason for strange API design in app_timer?

As i recently wanted to have a timer as a class member and a naive

class Foo {
    APP_TIMER_DEF(my_timer);
};

did not work I started to look into the source code. What I found where some very strange design decisions.

Let ... (more)

15k
views
15
votes
5
answers
Last activity 2015-03-03 19:57:43 +0200 by Chris Hodapp

Can I directly start programming a nrf51822 breakout board

Hi guys, I want to know if it is possible to get started on developing applications for nRF51822 without using the evaluation kit. I want ot have a couple of breakout boards made and buy a debugger to flash the ... (more)

15k
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no
votes
no
answers
Last activity 2016-03-04 03:25:10 +0200 by FA

Not answered question (nRF52 TWI easyDMA feature) [closed]

Hi,

Can anybody comment on the following question please?

https://devzone.nordicsemi.com/questi...

Thanks!

15k
views
18
votes
4
answers
Last activity 2016-02-11 14:53:59 +0200 by Stefan Birnir Sverrisson flag of Iceland

LDO vs DCDC (nRF51822)

I am not quite certain what the advantages/disadvantages are of using LDV vs DCDC if you are using an external regulator. In my case i use a LiPo battery outputting ~4.2V so i need to drop the voltage ... (more)

14k
views
no
votes
1
answer
Last activity 2015-12-14 04:56:53 +0200 by Anonymous

questions about nRF9E5

Hi.

I would like to konw some ditails aboute nRF9E5 device:

  1. What is the rang between 2 devices using 433 mhz.
  2. do you have any samples codes ? i need to trasmitt 2 a/d data.
  3. the developping board comes with ...
(more)

14k
views
33
votes
6
answers
Last activity 2015-01-02 08:35:08 +0200 by Stefan Birnir Sverrisson flag of Iceland

What is the power and clock model of peripheral in NRF51? [closed]

Hello,

I was puzzled by RM.

I notice POWER control register in peripheral(UART,SPI,TWI) module.

Please answer following questions about the relation between system power and the peripheral power register value.

  1. Will UART be powered when system power ...
(more)

14k
views
3
votes
1
answer
Last activity 2017-05-08 10:57:41 +0200 by Stian flag of Norway

question related to uicr [closed]

Hi, i am newbie to nrf51822 and want to know details of following stuffs:

1)what is use of uicr?

2)if i place some value in uicr and then change the image,then is there will be change in ... (more)

14k
views
no
votes
1
answer
Last activity 2015-10-16 12:59:26 +0200 by Anders Strand flag of Norway

how to add notification and indication in Link loss profile

Hello Everyone

i am using LINK LOSS service i would like to send notifcation to the peer device if the connection is lost and also if the connection is made between two devices can anyone suggest me how to do ... (more)

13k
views
7
votes
4
answers
Last activity 2016-08-30 09:12:57 +0200 by Martin Børs-Lind flag of Norway

Hardware TWI/I2C Example

The latest TWI example I can find is from 4 SDK revisions ago and uses old libraries. Is there a sample using the nrf_drv_twi library that is recommended for current development?

13k
views
2
votes
12
answers
Last activity 2013-08-14 02:05:19 +0200 by yillkid

Keil toolchain/compiler configurations incorrect

Hi all

My target board is nRF51822, and I want to run the heart rate demo project, but a error message when I compile it :

[b]Build target 'nrf51822_xxaa_s110 (256K)' assembling arm_startup_nrf51.s... arm_startup_nrf51.s: error: A3903U: Argument '--pd' not ... (more)

13k
views
6
votes
3
answers
Last activity 2015-03-20 10:22:04 +0200 by Bouke

nRF51822 TEMP internal temperature sensor characteristic

I'm trying to use the internal temperature sensor of the nRF51 to know the die temperature. Its accuracy is specced as +/- 4 degC, even +/- 8 degC at the extremes. Does anyone know more properties of this uncertainty? Is it ... (more)

13k
views
28
votes
4
answers
Last activity 2013-06-27 18:37:40 +0200 by Alex Lynchosky

How do I create my own service on the BLE stack? [closed]

I've sifted through the examples given to me, and none of them seem to explain how to create your own service and add it to the stack. All of the services that are registered in the ble examples (nRF51 ... (more)

13k
views
6
votes
4
answers
Last activity 2015-04-20 14:13:21 +0200 by Martin Børs-Lind flag of Norway

Compiling github projects

Hi,

After downloading any of the projects from nordic github, how does one compile the project successfully? Where should i extract the files to and what paths should i include? I have not been able to get a single project ... (more)

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  • Resolved questions: 9667
  • Unanswered questions: 2797
  • Total questions: 23073