# 21,591 questions

39
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## About energy-saving point of view, and the most optimal way to proceed in

Hello Nordic Team,

I have a question about energy conservation that we want to implement and how we want to make it as optimal as possible.

For our application and its use, we would like our Bluetooth module to be ... (more)

30
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## 6 notifications in one connection interval related issue

I want send out 6 notification in one connection interval. But now I only see 3 packets in my sniffer. So I want to know how to achieve this goal?

This picture is captured from S130's spec.

I have ... (more)

67
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1
vote
1

## How to temporarily disable the already bonded peers but allow new peer to bond?

Hi,

We are using nRF51822_QFAB (128K/16K), S110 V8.0.0 and SDK V10.0.0 for my development. We are in the need of guest (unbonded), pairing and bonded mode.

1. Guest (un-bonded mode) - Bonding is not allowed. But allow ...

(more)

30
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1
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1

## How to use the nRF51 DK（PCA10028） debug my nRF51822

My product only offer a debug interface（SWDIO/REST，SWDCLK，+3.3v，GND），but I learn that the nRF51 DK debug out interface has several pins，such as EXT VTG，EXT GND DETECT，EXT SWDIO，EXT SWDCLK，EXT SWO，EXT ... (more)

33
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1
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1

## Is a delay needed between Characteristic updates

Is a delay needed between Characteristic updates

I modified the ble_sdk_app_proximity example. I added x3 services, based on the BLE Characteristics, a beginner's tutorial, and it seems to be working fine. (nrf5-ble-tutorial-characteristic-CompletedCode ported for SDK 13.zip)

The timer ... (more)

25
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## How is BLE_CONN_HANDLE_INVALID changed in multiple services [closed]

How is BLE_CONN_HANDLE_INVALID changed in multiple services

I modified the ble_sdk_app_proximity example. I added x3 services, based on the BLE Characteristics, a beginner's tutorial, and it seems to be working fine. (nrf5-ble-tutorial-characteristic-CompletedCode ported for SDK 13.zip)

The first ... (more)

21
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## PWM Differential output

Would you please tell me how to use the nrf52832 PWM interface to implement differential output to spkr?

Here is my PWM interface configuration code:

NRF_PWM0->PSEL.OUT[0] =   (PWM_IO << PWM_PSEL_OUT_PIN_Pos) | (PWM_PSEL_OUT_CONNECT_Connected << PWM_PSEL_OUT_CONNECT_Pos);
NRF_PWM0->PSEL.OUT[1] =   (0 << PWM_PSEL_OUT_PIN_Pos) | (PWM_PSEL_OUT_CONNECT_Disconnected ...
(more)

12
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## nrftool box 2.4.0 Fails to do Single bank bootloader

I am using nrf51822 with softdevice 7.3 and sdk6. I am having some strange problems in single bank bootloader. The nrftoolbox version 2.4.0 gets stuck at 94% during the firmware update. But it works fine with nrftoolbox ... (more)

24
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1
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1

## 32-bit float transmission

I have 32-bit float numbers, sent to the BLE from SPI. I can manipulate this into x4 bytes, or actually use sprintf and get a real 6-byte representation of the number.

For debugging: So, to make debugging possible / easy, (I ... (more)

15
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1

I have modified the secure bootloader for my custom PCB (removed the GPIO for the button check), so that is not an issue.

I can ... (more)

15
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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)

53
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## Single bank DFU failed over Meizu phone and 360phone

First,the meizu phone can dfu successfully in the dual bank mode, So do the 360 phone. But in single bank DFU,this two kinds of phone failed, So I make the programm enter the debug mode, It stopped at ... (more)

161
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## nRF51822 CE immunity test

During the CE immunity test, the nRF51822 has to re-connect automatically without user interaction when the BLE connection is blocken by noise. Please tell me how to implement BLE re-connect when the connection lose.

32
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## TFTP and Other IoT SDK Examples For Thread

While reviewing the Thread DFU examples I saw that Nordic ported the IoT CoAP library to thread. Is it possible to use other IoT libraries with some modification? Obviously only the UDP based ones will work.

If not, are there ... (more)

69
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2
2

## Setting MTU Above 64 bytes Crashes ble_app_uart

Hi all,

I am trying to send a large stream of bytes(60kb) to an NRF52823 using bbowl. BBowl exposes the uart through a TCP socket connection using noble.

I modified the gatt_init code in SDK13 to support the largest ... (more)

34
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1
vote
1

## Compatibility between nrf51822 and nrf51422

Hi , I am using nrf5 SDK v12.2.0 ,

I have an nrf51822 board .. can I just compile the examples in SDK for pca10031 and use it for nrf51822 . Please let me know what I can do?

68
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## Configuring the Link Layer for DLE with s132 v4.0.2?

With s132 v3, in addition to configuring the GATT to receive larger packets like so:

ble_enable_params.gatt_enable_params.att_mtu = 247;
err_code = softdevice_enable(&ble_enable_params);

err_code = sd_ble_opt_set(BLE_GAP_OPT_EXT_LEN, &ble_opts);

I ... (more)

37
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2
1

## sys_evt_dispatch What is?

Hi all,

I have understood that sys_evt_dispatch is used for all events that aren't BLE but concern the softdevice.

I start to develop my code on gls_example, here in sys_evt_dispatch there are two function

static void sys_evt_dispatch(uint32_t sys_evt ...
(more)

396
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1

## Fatal error: 0 (src\ll_lm.s0.c:571)

Hi, I'm using nrf8001 nordic chip on my project. With some time on the nrf8001 chip begins to send the HW_ERROR with failure on ll_lm.s0.c and line 571. This not crash the board yet, but with more ... (more)

32
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## 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)

26
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1

## mergehex nrfjprog build target eclipse ide

Hi there, I was able to issue "make VERBOSE=1 mergehex" from my cmd line and it worked. When I do the same via build target from Eclipse, it is giving me "no such file or directory" error. Can someone ... (more)

43
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1

## Flash Data Storage

Hi,

In the product I'm working on I need to store some configuration data in persistent memory. I came accross serveral ways to do that. I think the best way to go is to use the Flash Data Storage ... (more)

127
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## Range/power: IEEE802.15.4 (thread) vs. Bluetooth 5

Dear experts,

Comparing:

• Bluetooth 5, Coded PHY (longest range), 125kBit/sec

Questions:

• Which technology has longer range?
• Which technology has better range/power ratio?
• What current consumption can I expect of nRF52840 when ...
(more)

105
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2
1

## Demo complexity

Would it be possible to get simplified versions of the board support package. Following e.g. the macros is veeerry difficult. A simple version of the HeartRate demo with minimum historical baggage, just for the 52832 would be greatly appreciated ... (more)

208
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## 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)

50
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1

## CPU halt during flash erase

Hello,

I am wondering if I/O hardware interrupts get lost during the time when CPU is halted due to flash erase.

Can Nordic also confirm if BLE data transmission in impacted negatively when flash activities are running. ( I am ... (more)

42
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1

## Temperature Range of the nRF52

Hello,

I am currently searching for BT and NFC Chips, which can deal with a bit more than the usual 85°C. The nRF51822 is specified to 105°C, is it possible to run devices of the nRF52 Series at ... (more)

83
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3
1

## Using NRF51822 to achieve sub-us synchronization between MCUs

I have an application where I need to synchronize several devices to within 1us using a radio. In order to do this, we need to make a protocol that allows precise synchronization. We are already using a different vendor's ... (more)

49
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1
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1

Hi Everyone,

I am working on a hobby project with nRF51822 which needs me sample upto 4 signals reliably at 500Hz each at 10bit resolution. I have read through few posts in the forum([1],[2],[3]) and found that ... (more)

136
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2
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## How to call Time() function in Nordic nrf518222(Milliseconds) ??

Hello,

Please tell me, How to call Time() in milliseconds in Nordic nrf51822 ??

#### Statistics

• Total users: 18323
• Latest user: Mindy Atkin
• Resolved questions: 9148
• Total questions: 21591

## 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

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• ### 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

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• ### how to flash programs on nrf51822 via nrf51 DK

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