# 20,015 questions

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## How Can I sniff GATT Service or Characteristic Attributes by PCA10031 (NRF51 Dongle)?

By using ble-sniffer, I success to catch BLE Advertising packet with my NRF51 Dongle in CMD and WIRESHARK either.
But, I can't sniff any other packet except type of ADV_IND, ADV_SCAN_IND, SCAN_REQ.SCAN_RSP and some of Unknown (CRC Incorrect ...
(more)

5
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## After the host calls "sd_ble_gap_connect_cancel", the slave is not disconnected.

Hi.I have a qusetion!Thanks!

After the host calls "sd_ble_gap_connect_cancel", the slave is not disconnected.

What causes this phenomenon?

8
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## How to get device details of BLE devices seen by NRF52?

My setup is a Android phone, Nordic NRF52, and random BLE devices in the area. What I want is, the Android NRF-UART app connects to the NRF52 and the NRF52 sends information about the BLE devices it sees around the ... (more)

7
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## GCC/Eclipse tutorial: make: The system cannot find the file specified

Hi - I am following this tutorial and getting this error.

This exact question was asked; however, I do have the mkdir file in the C:\Program Files (x86)\GNU ARM Eclipse\Build Tools\2.8-201611221915\bin folder.

My makefile.windows ... (more)

22
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## [Hardware] nRF52 - NFC antenna design

Hi,

I'm developing a project based on nRF52 and utilizing NFC for my master's degree. One part of the project will be a beacon with as small PCB layout as possible. That's why I'm considering designing ... (more)

7
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## NRF_LOG_FLOAT doesn't display negative numbers properly

Platform: nRF52832 using SDK12.2 and Keil 5.20a

I've encountered strange corner case when displaying negative floats using NRF_LOG_DEBUG.

My test code looks like this:

float test_float=-0.99701f;

//use sprintf as reference point
char buff[50];
sprintf ...
(more)

6
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## pc-ble-driver: "Failed to open nRF BLE Driver. Error code: 0x0D"

Hi.

I'm getting an nRF Dongle (PCA10031) set up on a Windows machine to be the BLE central that we'll use for our production line testing. To that end, I've built the pc-ble-driver code following the instructions ... (more)

43
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3

Hello. How i can do a simple read an 0 -> 3 Volt (vdd) signal on Analog 0 P0.03? I try it with saadc without sucess

            int result = 0;

SAADC_CH_CONFIG_TACQ_10us ...
(more)

7
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## Indication enable MCP lost the indication

hi all,

I have this problem:

After enable the indication i send one, with a snuffer ble i see it and recieve it. But the master control panel lost it?

Why?

Thanks, Anna

113
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## nrfutil v0.52 dfu serial / ble - HCI packet in terminal

Hi,

I'm using nrfutil to update my nRF52832.

I change target from nRF51822 to nRF52832 and I want be able to bootload my target through own master.

In past, I used hci_dfu_send_hex.py in verbose mode to convert hex ... (more)

31
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2
1

## Radio: frequency deviation & drift, vs Bluetooth requirements

I have a couple of questions regarding Radio transmission for BLE.

1) Is the radio driven by one of the HFCLKs? If so, it confuses me how a 16M clock can drive/derive a much faster 2.4 GHz radio ... (more)

19
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## Serialization S132 strange behavior

Hi,

I am currently using the NRF52 in a serialized application, with the SPI bus. I am using the SDK 12.1.0 and the softdevice S132 V3.0.0

My application is running well, as expected : We perform scanning ... (more)

35
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1

## Need help with openocd and stlink

Hi,

I configured openOCD and gcc compiler. But i got following error. i gave following command on terminal.

i created one file that is manual.cfg and contain in that file as follows.

 #nRF52832 Target
source [find interface/stlink-v2.cfg ...
(more)

11
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## Receiving internal error on securing BLE link

At the moment I am working on a project that uses the nRF52328 acting as both a peripheral and central to connect 3 separate devices intermittently. I am storing their bonding information. A current problem I have now is that ... (more)

35
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1

## Error JLINKARM_DLL_ERROR when using Power Profiler

I am getting an error in the Power Profiler ppk.py when it is starting. The error occurs on the first call to nrfjprog.rtt_read. The error is JLINKARM_DLL_ERROR, which is -102.

(Updated) I wrote a similar small Python program ... (more)

50
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1
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2

## nRF52 wirting GPIOS direct with immediate effect [closed]

Hi I have ported a simple function from nRF51 to nRF52 which Outputs PWM coded Startup Diagnose Information via a GPIO. The Timing is generated by wait Loops and GPIO will be toggled by direct writing to OUTSET Register. I ... (more)

15
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## Are there any libraries for the connection microphone / audio codec / Nrf52dk ?

I would like to pick up audio signal with a microphone for ex. AKU340, then use audio codec to digitize it, then save the output in a SD card connected to the nrf52, reading that out and analyze at the end

36
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1
vote
1

## nRF always landing in the non-existant ResetHandler

I have copied the blinky example:

/* Copyright (c) 2014 Nordic Semiconductor. All Rights Reserved.
*
* The information contained herein is property of Nordic Semiconductor ASA.
* Terms and conditions of usage are described in detail in NORDIC
* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT ...
(more)

6
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## SDK13 nfc_t2t_payload_raw_set() not work properly.

Hello, I use SDK example nfc_text_record for pca10040 DK. With aim to check memory area of the emulated tag I've modified example with next:

 /* Set up NFC */
err_code = nfc_t2t_setup(nfc_callback, NULL);
APP_ERROR_CHECK(err_code);

static const uint8_t key[16]={0x01 ...
(more)

15
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1

## uart peripheral configuration with 9 bit data length

Hi,

Is it possible to configure uart peripheral with 9 bit data length (without parity) ?

Thanks

39
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1

## BLE_GATTC_EVT_TIMEOUT: Possible causes?

Hello,

I am still having troubles with the BLE_GATTC_EVT_TIMEOUT. The problem is that the error is not happening frequently and is hard to reproduce. It is also hard to attach a sniffer to each connection (and the nRF sniffer doesn ... (more)

90
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## indication issue

Hi all,

someone can please explain to me how works the indication?

How can i read the value of cccd in the APP?My problem is understand if the APP is ready to receive the indication. i would like read ... (more)

23
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1

## Button to enable bonding

Nrf52 SDK12.2 armgcc

I have a button on my device (peripheral) that when pressed starts a timer for 30 seconds. During that 30 seconds, I would like to have the device be in a sort of pairing mode. In ... (more)

27
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## QFAA H0 examples don't work

Hi. I've developed a custom board on an old E0 51422 chip with SDK 6.1 and SD110 7.3.0. Everything works fine with that setup (SPI, interrupts, timers, etc). Got new batch of chips of version H0 ... (more)

128
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8
2

## What exactly does sd_ble_gatts_characteristic_add do?

My guess is that:

Characteristics are (or at least, can be considered) subsets of services, which in turn, are (or at least, can be considered) subsets of profiles.

The BLE standard gave developers a lot of latitude which enables them ... (more)

30
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## Power Profiler "Cannot find calibration values"

Hi, I have set up the Power Profiler as per the directions now on the step connecting the board to the Wiindows Python app it says "Cannot find calibration values" and the app quits. I cannot get beyond this step ... (more)

234
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no
1

## won't reset chip after dfu

Hi,

I am using keil uvision 5.17, SD 130, nRF 51822, dualbank bootloader.

I have programmed own application and merged bootloader, application, soft device.

I can do dfu as many as I want,

but the problem is I should ...

(more)

80
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2
2

## Connect to multiple Segger J-Link debuggers

Hello!

I need to interact with two J-Link debuggers, connected to the same PC at the same time. I would then read and write data to the devices connected to the debuggers.

To send/receive the data, I was thinking ... (more)

13
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Hello! I need to perform some radio tests on a board that contains an nRF52 SoC. The nRF5 SDK provides two ways of performing such tests, either using DTM, as specified by Bluetooth SIG, or using the Radio Test example ... (more)

28
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1

## Embed support for nrf52840

When will Embed OS support be available to nrf52840 ?

#### Statistics

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• Latest user: Gretta Arnett
• Resolved questions: 8579
• Total questions: 20015

## Recent blog posts

• ### nRF52840 long range demo

Posted 2017-02-14 12:46:03 by Ole Bauck
• ### Setup and Running the OpenMesh DFU on the nRF52 DK v2.0

Posted 2017-02-06 22:33:25 by martindavidb
• ### New NFC feature on nRF52 Series: Read/write capable Type 4 Tag NFC library in nRF5 SDK.

Posted 2017-02-02 10:31:31 by Pär H
• ### Simple Application-level Authentication

Posted 2017-01-30 12:34:01 by Daniel Veilleux
• ### WIZnet's BLE to TCP Gateway

Posted 2017-02-01 01:12:03 by Mason Lee

## Recent questions

• ### How Can I sniff GATT Service or Characteristic Attributes by PCA10031 (NRF51 Dongle)?

Posted 2017-02-25 08:33:42 by Daniel T. Lee
• ### After the host calls "sd_ble_gap_connect_cancel", the slave is not disconnected.

Posted 2017-02-25 05:56:16 by shuhe
• ### How to get device details of BLE devices seen by NRF52?

Posted 2017-02-25 04:37:49 by QDI
• ### GCC/Eclipse tutorial: make: The system cannot find the file specified

Posted 2017-02-25 01:53:35 by dkwill
• ### [Hardware] nRF52 - NFC antenna design

Posted 2017-02-24 23:31:41 by Konrad Traczyk