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23,073 questions

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

2k
views
59
votes
22
answers
Last activity 2017-06-07 08:03:33 +0200 by max

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)

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?

4k
views
49
votes
1
answer
Last activity 2017-03-03 14:31:03 +0200 by Aryan flag of Norway

What are SDK 12.x.0 known issues

On SDK 12.0.0, SDK 12.1.0 and SDK 12.2.0 only

Please Do not judge the quality of SDK based on number of entries here. This thread should be considered as part of Nordic effort to ... (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?

4k
views
48
votes
2
answers
Last activity 2014-12-07 02:41:17 +0200 by RK flag of Singapore

CC2541 versus nRF51822

Gentlemen,

I apologize if this is not the correct place to post this question.

I have a potential project to start a BLE project but their requirement would be start a new design with the CC2541.

However, I would like ... (more)

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?

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)

2k
views
40
votes
2
answers
Last activity 2016-10-05 14:35:20 +0200 by Aryan flag of Norway

what are SDK 11.0.0 known issues

On SDK 11.0.0 only (NOT the alpha release)

  • Do not judge the quality of SDK based on number of entries here. This thread should be considered part of Nordic effort to main the quality of the release.

GENERAL ... (more)

8k
views
38
votes
6
answers
Last activity 2016-09-14 18:35:45 +0200 by Stefan Birnir Sverrisson flag of Iceland

How to measure Lithium battery voltage [closed]

How to measure Lithium battery voltage with the nRF51 ADC

11k
views
38
votes
9
answers
Last activity 2015-04-20 08:52:35 +0200 by Joe Merten

nRF51822 over the air bootloader with gcc

For my current project, I need to compile the »over the air bootloader« with gcc (because our buildserver runs on linux, developers using Mac … no Windows and no Keil so far).

But unfortunaly, the bootloader example from the sdk (5 ... (more)

20k
views
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)

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)

20k
views
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)

262
views
32
votes
2
answers
Last activity 2017-04-19 15:07:45 +0200 by David Edwin

Can i play audio from storage wirelessly on speaker using nrf51422 and on nrf52840?

I want to play songs wirelessly on speaker ,suppose speaker is connected to one soc and and another soc is connected to storage which contains songs how do transfer that from storage to speaker and play wirelessly and please tell ... (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)

4k
views
27
votes
1
answer
Last activity 2015-12-08 14:06:45 +0200 by Ole Bauck flag of Norway

My device is freezing and restarting

My device is either freezing or restarting, and i do not know why.

6k
views
26
votes
2
answers
Last activity 2015-10-14 09:25:26 +0200 by Aryan flag of Norway

Best way to implement system clock on nRF51

Hi everybody,

a while ago I used the approach proposed here https://devzone.nordicsemi.com/questi... to keep the date and time on a NRF51822 device while using Softdevice S110 and the Timeslot advertiser-scanner (https://github.com/NordicSemiconducto...).

In practice ... (more)

180
views
26
votes
1
answer
Last activity 2017-03-09 14:49:54 +0200 by Jim

nRF51: IoT-MQTT Publisher Example problems

Hi, I just read IoT-MQTT example and have almost exactly the same problem but with the Publisher. I am running a PI with Raspberian 4.4.34-v7+. I have installed mosquitto on the PI and have radvd installed. I turned ... (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?

12k
views
25
votes
2
answers
Last activity 2016-05-20 16:28:53 +0200 by melchior

What does CCCD mean?

Dear Nordic Developer Zone,

I have a silly question. After searching in the Nordic and Bluetooth documentation, I didn't find what CCCD and SCCD mean. Theses metadata are parts of the characteristics.

Can you explain me what these acronyms ... (more)

9k
views
24
votes
1
answer
Last activity 2014-12-08 18:20:32 +0200 by puz_md flag of Germany

nRFgo Studio cannot load JLinkARM.dll, re-installing does not help. What went wrong?

After installing nRFgo Studio v1.17.1 on Windows 7 64 Bit (using the administrator account), I get an error message in the Log section just when I start the program:

"JLinkARM.dll is not correctly installed. Please run the ... (more)

5k
views
23
votes
13
answers
Last activity 2014-08-28 07:51:49 +0200 by RatocKen

Flashing bootloader and application via J-Link [closed]

Hello. I want to make flashing of devices for production faster. So I want to write application together with bootloader via J-Link simultaneously and not via OTA DFU. I'm using S110 v6 and dual bank BLE DFU from SDK ... (more)

8k
views
22
votes
10
answers
Last activity 2014-01-24 13:54:20 +0200 by Masahiro

BLE Sniffer recommendation [closed]

Hello, I use nRF51822 for my project and I would like to purchase some BLE packet sniffer. Does anyone recommend any sniffer? My purpose for that is debugging and check transaction, so it will be good that it has a ... (more)

11k
views
22
votes
3
answers
Last activity 2016-10-19 14:08:31 +0200 by uly

How to get 6 byte mac address at nrf51822

When I scan BLE device at nRF UARTv2.0 App in Android4.4, it is appar device name(Ex:Nordic_UART) and 6 byte device address(MAC address?). I want to include mac address in device name. How to get 6 ... (more)

9k
views
21
votes
5
answers
Last activity 2014-09-11 12:08:07 +0200 by Tim

How do you put the nrf51822 chip to sleep? [closed]

I am wondering how you put the nrf51822 chip to sleep. I've determined that the way to do this with the soft device is sd_app_event_wait() in the while loop. What about non-softdevice?

I am wanting to have it sleep ... (more)

7k
views
21
votes
1
answer
Last activity 2016-02-03 10:42:54 +0200 by Carles

GAP Address types [closed]

Hi,

I use a personnal GAP Address, but it must be the type used: -Public address. -Random Static address. -Private Resolvable address. -Private Non-Resolvable address.

and what is the difference?

Code :

st_Gap_Addr.addr_type = BLE_GAP_ADDR_TYPE_RANDOM_STATIC; st_Gap_Addr.addr [0] = g_stBL[0]; st_Gap_Addr ... (more)

6k
views
21
votes
2
answers
Last activity 2014-10-01 08:08:40 +0200 by Stefan Birnir Sverrisson flag of Iceland

Update connection parameter programmatically [closed]

Hi

I want to update the connection parameter and send this request from nrf51822 to a smartphone app. I see there is a function ble_conn_params_change_conn_params() for this. However, every time I call this function, nrf51822 disconnects the current connection and ... (more)

2k
views
21
votes
1
answer
Last activity 2014-11-11 16:15:03 +0200 by Stefan Birnir Sverrisson flag of Iceland

nRF51822/nRF51422 getting started and documentation overview

What is the best place to get started with nRF51 and BLE development?

1k
views
19
votes
6
answers
Last activity 2014-11-24 09:29:45 +0200 by aaronxu

PWM Duty Cycle update best practices

Because of the limitation in the GPIOTE hardware that only one channel can be connected per GPIO, care must be taken when changing a PWM duty cycle. If for instance the compare events that each trigger a GPIOTE toggle happen ... (more)

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