# 11,044 questions

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## Problem with SAADC examples for audio sampling

I am using nRF52 pca10400 and I would sample some audio signal for short periods of time, but I found a lot of difficulties with the SAADC example from sdk 13, since if I put a value greater than 126 ... (more)

5
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## Any way to put system into "OFF" state in hard fault handler with SD enabled?

Long title, but basically sums it up - is there any way to put the nRF51 into the off state from within the hard-fault handler if the soft-device was enabled prior to the fault? The complication is that the soft-device seems ... (more)

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## Can I create Characteristic with Notification only, no Read, no Write

I can remove the //char_md.char_props.write = 1; and only the Read and Notify Properties show up in MCP (or the iPhone)

When I comment out the char_md.char_props ... (more)

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## Problem with example fpu_fft sdk13 nRF52832

Hi, i'm using keil and i would like to run the fpu_fft example to perform a fft. The example works if I set 128 or 256 as number of input vector data as you can see in the picture ... (more)

25
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Hello,

I connected the nrf module to jlink as described:

• vdd(nrf)-----3.3V
• gnd(nrf)-----gnd


6
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## Eclipse IDE can't build

My setup is based on a jlink clone and yunjia module nrf51822 and nRF51_SDK_10.0.0_dc26b5e. I am following this tutorial successfully till the section Enable auto discovery of symbols, include paths and compiler settings. After rebuilding the project I ... (more)

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## Is it possible to have passkey with Just Works bonding

I noticed some suggestions to add Static Passkey.

I have 10040 nrf52832 sdk13.0.0 s132

The server has no IO, so cannot enter passkey from it. 1) Is there an example to add PIN to the server, even though ... (more)

19
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## NRF52 and beacon ( NRF51) example

Hi,

Is there any ready made app of NRF52 and NRF51 ( beacons), where beacons are communicating with the NRF52 and based on some nordic app for PC we can view that how many beacons are connected at the moment ?

49
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Hello

I am building bootloader. I do not use Softdevice and used example from this topic. Bootloader must read FW from uSD card, update flash and jump to application. uSD card is connected to SPI0 of nrf51. SPI1 is used ... (more)

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## trying to update date for BLE device but getting this error "Error changing notification state: The request is not supported."

trying to update date for BLE device but getting this error "Error changing notification state: The request is not supported."

Trying to write date: on nRF52 device calling below write method:

converted this date "CD2EFC59 " hex data to nadata and ... (more)

33
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## Automated testing using NRF connect: How to read phone's service characteristics?

I am creating a BLE peripheral device which I want to test using the automated testing feature of NRF Connect. I have connected a android phone to my windows PC and the phone has NRF connect app installed in it ... (more)

8
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## Bonding information lost after DFU OTA update SDK 10.0 SD 8.0

Hi,

We are currently facing this issue, where after a DFU application firmware update (or bootloader update) the bonding information gets wiped out.

We are using a custom board as peripheral based on NRF51822, with Soft Device S110 8.0 ... (more)

6
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## How can I detect the state of an LPCOMP input?

I am programming a device with a NF52 that uses a hall effect switch o enter/exit sleep mode when BLE is in advertising mode. When connected, It will generate a separate BLE notification for the condition that a magnet ... (more)

73
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## CC2451 as proximity with nrf52832

Hi, Can I use TI (cheap module 2451) as experimental blinky with central NRF52832.Don't need send button command , only UUID (TI:FFE0) check.It is possible?

Thanks

4
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## nrf905 433 to 915 rf output

I purchased a bunch of ptr8000 boards off ebay from china to do some testing of the nrf905 without realizing they were setup for 433mhz, and I need 915mhz. Looking at the datasheet reference design, it appears there are just ... (more)

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## What is the passkey for gls example, where is it set

What is the passkey for gls example, and where is it set

I am using SDK13, 10040 nrf52832 s132

Any help appreciated

7
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## CMSIS_DSP bilinear interpolation help

I'm looking for an example of how the pData data table is configured in the arm_bilinear_interp_instance_f32 structure.

I have read the online notes which I've copied below, but I don't understand how to implement this

The instance ... (more)

14
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## nRF52 IPv6 SDK/examples

Hi,

I'm looking at adding IPv6 connectivity to my nRF52-equipped product. When I last looked a year ago, things seemed to be moving along very quickly. However, looking again at how to get started, I only see this SDK ... (more)

19
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## Plans for the AirFuel stuff?

Hi, I'm interested in the nRF5 SDK for AirFuel.

I have received a task to replace parts in a product which formerly used wireless charging and the CSR BLE chip.

I think choosing the nRF51 or nRF52 that support ... (more)

8
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Hi, I am working with the example Blinky_freertos present on the SDK_13.0.0_04a0bfd. I have built the example w/o issues in compilation but I have the following problems with the linker:

1. undefined reference to `nrf_drv_clock_lfclk_request'

2. undefined reference to ...

(more)

19
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## NRF52840 + SDK 13.0.0 (S140): MULTI-ROLE NOT WORKING & IAR COMPILER OPTIMIZATION ISSUES

Hi, I’m using nRF52840 with softdevice s140 and nRF5 SDK v13.0.0 and I’m having some issues regarding the optimization set up for the IAR Compiler (IAR Embedded Workbench v7.70.1). The application that I’m ... (more)

20
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## NRF51 simple vector deflection function?

I use STM32F4+nRF51822 through the SPI interface. I want to achieve nRF51822 DFU with SPI operation, now upgrade the simple LED to work properly. But can not work when using Gazlle. I know it is because the interrupt vector ... (more)

9
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## error is observed in both sd_ble_evt_get and ble_ancs_c_init

for ble_app_ancs_c_s130_pca10028 example of sdk11,s130 version 2.0.0

The preferred RAM,ROM and UUID COUNT is shown below

FLASH (rx) : ORIGIN = 0x0001B000, LENGTH = 0x25000 RAM (rwx) : ORIGIN = 0x20002790, LENGTH = 0x2790

ble_enable_params.common_enable_params.vs_uuid_count = VENDOR_SPECIFIC_UUID_COUNT;

VENDOR_SPECIFIC_UUID_COUNT= 4;

with th ... (more)

17
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## How to make 51822 not discoverable to phone

Hi, I have 52832(ble_app_multilink_central 12.2) which is connected to 5 51822 (experimental_ble_app_blinky) modules. How to make 51822 not discoverable or not connectable to phone/tablet(android/ios )?

22
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## Unpredictable behaviour of RTC2 on nRF24le1

I found a problem using the RTC2 on the nRF24le1 which i dont know how to solve it.

I am using the RTC2 on the master to generate a TICK interrupt exactly every 1s. With the formula on page 97 ... (more)

35
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## Using nRFgo Studio when producing 18000 units

I need to do the following when assembling a device with nrf-52 at the factory.

• Add a unique serial number for the device
• Print a sticker and add on the outside of the device box with ...
(more)

23
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Hello is this possible to send the 255 byte in the Advertising Paket ? if yes then do you have any example ?

Best Wishes

Ati

101
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## How can I disable the GPIO irq

hi how can i disable the gpio irq, can how can i enable it.

and if i disable one pin irq not effect the other one?

Thank you very much.

71
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Please can anyone help me on how to use(program) PWM hardware with individual loading mode? My goal is to control 12 LEDs individually with different duty cycles and playbacks using pwm hardware which has 12 outputs to make a ... (more)

21
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## How to read Power Profiler Kit Measurements

Hi,

I have a beacon that uses 4 AA batteries, each has 1.5V and 2600 mAh. When connecting the board to the PPK I get the attached measurements when doing a lot of scanning and advertising:

It is weird ... (more)

#### Statistics

• Total users: 18365
• Latest user: Opal Akers
• Resolved questions: 9161
• Total questions: 21630

## Recent blog posts

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Posted 2017-03-20 17:13:52 by Hung Bui

## Recent questions

• ### Problem with SAADC examples for audio sampling

Posted 2017-04-25 01:49:48 by stefano.luna
• ### Any way to put system into "OFF" state in hard fault handler with SD enabled?

Posted 2017-04-25 00:58:05 by MarcF
• ### Eclipse IDE can't build

Posted 2017-04-24 22:41:24 by normanfust
• ### Can I create Characteristic with Notification only, no Read, no Write

Posted 2017-04-24 21:56:47 by Renix
• ### trying to update date for BLE device but getting this error "Error changing notification state: The request is not supported."

Posted 2017-04-24 21:39:31 by Vijyendra