# 1,365 questions

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## Programming SoftDevice to custom PCB: Unable to find or open the JLinkARM dll

I've been trying to program a custom PCB with an nRF52832, using the nRF52 Development Kit and nRFgo Studio.

When I connect just the nRF52 Development Kit to my computer and program the SoftDevice (s132_nrf52_3.0.0_softdevice.hex), it ... (more)

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## Relay Defination and Question

Hey, Just had a quick question... I was doing the Relay example and I don't totally understand what a "relay" is. Can you explain what the purpose and usage of relay is for?

On the same note, if my ... (more)

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## Unable to Send Messages NRF52 BLE Central Custom Device

Currently I am using the NRF52 device to connect with a custom peripheral. The current goal I am trying to reach is toggling an LED by sending the command 0x8900 through Service UUID 0x0001 with Characterisic ID 0x0002.
This is ...
(more)

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## Reduce connection establish time

Hello,

i have a BLE Peripheral that has a service that we use to simulate UART over BLE. Very similar to the nRF UART. I consider the time to establish a link that allows to send asynchronous data to be ... (more)

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## CCM module resets the mcu

I have written a simple implementation for using the ccm module with mesh. It encrypts and decrypts as it should but when enabled the processor makes a soft reset. It happens quiet often but not on every sent or received ... (more)

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## beacon for nrf52

Hello!

I have to sample audio signal from a microphone (MAX 9814 adafruit) with the nrf52 board. I use the saadc and then I perform a FFT of the data using the sdk 13 examples. My idea is to sample ... (more)

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## TWI master blocking mode & non-powered peripheral

Hello to all nordic jedi masters!

I have made an observation, on which I would like your confirmation. My combo is: nrf52832 + SDK 11 + SD132.

Will my application "hang" if I am operating the TWI master in blocking mode, and ... (more)

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## spi master example code

hello , I am new to SPI protocol.I am using NRF52 DK &nRF5_SDK_13.0.0_04a0bfd( pca10040) using keil-5. I want spi master example code. Can any one suggested me where I find the spi master example code, Because I have ... (more)

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I've merged the experimental_ble_queued writes sample code into my project and am testing the long write characteristic with nrfConnect from an Android phone. I get no errors anywhere, everything seems to work fine, except I never receive the BLE_GATTS_OP_EXEC_WRITE_REQ_NOW ... (more)

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I have a small problem with my bootloader + application on NRF52832. I'm using SDK 12.2.0 with S132 v3.0.0.

When the device loses power, and power is then re-applied, the bootloader doesn't start the application ... (more)

25
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1

## using DFU to update softdevice

I'm using nRF52 + s132v2.0.0 + SDK11.0.0. I want to be able to update to s132v4.0.2 (or so) + SDK13.0.0 via DFU. I'm planning on modifying the bootloader start address to 0x77000 with ... (more)

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## CLI autocomplete

Hey. Has anybody played with autocomplete for command line interface. I like it alot and it is very helpfull. Now a autocomplete would be cool!

Here is what comes to mind:

• key as arrows and tab should be treated as ...

(more)

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## sdk13.0.0 ble_app_hrs mtu size

Hello,

I'm testing ble_app_hrs example by nRF52832 DK.

When i change NRF_BLE_GATT_MAX_MTU_SIZE up to 158, the example project run properly.

But, when i change MTU size over 158, the code reset after entering softdevice_enable().

Is it impossible to change ... (more)

48
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3
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## ANCS Code base (bonding) with NUS and strange behaviour with nRF Toolbox

Hello the Nordic Team,

I come here after a lot of research and testing and do not understand what is going on in my program. (is it Embedded or iPhone nRF Toolbox side ?)

I took the ANCS code ( nRF5_SDK_12.2 ... (more)

54
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## dim led to minimize current consumption

Hello, I am using nrf52832 custom board, with SDK 11.0.0 and s132_nrf52_2.0.0 and trying to dim led. It seems the only suggested solution is to use the pwm driver. I was wondering if there are any ... (more)

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## nRF52 Preview DK on OSX

Hi there,

What is the recommended development tool setup for nRF52 Preview DK on Mac OSX? Your guide for SDK 0.9.1 seem to rely on Keil which isn't natively available for OSX.

Thanks. /Henrik

52
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## app_mailbox vs nrf_queue

Hi all,

What is the difference between the app_mailbox and the nrf_queue api?

The documentation says:

A) The mailbox library provides functions to safely exchange messages by queuing them and reading them from the queue. Key features include:

(more)

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## nRF52 DFU questions

I'm using nRF52 + SDK11.0.0 + s132 and have a couple of questions on DFU.

1. I want to use a CMSIS-DAP programmer + OpenOCD to upload the bootloader (or BL+SD+APP+setting) hex files. The application/SD boot up ...
(more)

43
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1
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1

## Join SPI and IPv6 over BLE

Hello!

I have the board PCA10040 (nRF52 DK).

I designed two different programs:

• SPI: I'm using the SPI communication to communicate with an external sensor (accelerometer). I used the latest SDK version: v13.0.0.
• MQTT publisher/subscriber: I ...
(more)

54
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1
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1

## s140 nrf52840 freeRTOS

Hi Engineers!

does new s140 nrf52840 support freeRTOS like s132 does ?

Thanks!

110
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## Use DMP of MPU9250

my code is below. git_mpu9250_dmp.zip

Hello.

I use nRF52 & MPU9250. I want to use DMP, but I can't read data with DMP. Because it have failed that writting firmware.

I want to check connect sensor between nRF, I ... (more)

43
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## nRF52 DK antenna gain

Hi everyone, I need to know the gain of the BT antenna integrated in the DK for nRF52. Can anyone help?

Thanks, Alessandro.

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## SPIM & easyDMA: understanding Soft Device interrupts and timing

I have another longer question regarding an SPI led driver I’m working with that has some strict timings, but I wanted to ask a more succinct question here since I think I may not be entirely clear on how ... (more)

39
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## Is only a single async UART supported on the NrF52 832/840 devices?

Is only a single async UART supported on the NrF52 832/840 devices?

58
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## nRF52840 DK 2016.49

We have received few nRF52840 preview DK. And one among them has a white sticker label which says 2016.49 and all others have 2017.14.

Should we be using the ones with 2017.14 (assuming this to be latest)?

84
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## Only hex format supported by nRF Connect UART over BLE

I am using nRF Connect with nRF52 and need to use UART over BLE to send command to the device but I find that you can only use hexadecimal input and get hexadecimal output. So it is not very convenient ... (more)

435
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## NRF52 Dim LED with PWM Driver

I am migrating from nrf51 to nrf52. Using SDK12.1

On NRF51, I used the PWM Library to use 2 buttons on the DK to dim up or down onboard LED1 (called OUTPUT_LED). It worked great (not sure if it ... (more)

39
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1
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1

hello,I am testing twi scanner example of nrf52dk.I want to read slave address, the sda & scl pins are 26 & 27 respectively. I am connected PCA9536 module as slave & address of that module is 0x41.I want to read ... (more)

37
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## how to change the Radio transmit power of nRF52-DK?

Hi,

I am a hardware designer. I have little knowledge about firmware or software. Now I want to apply the nRF52832 to an ultra-low power application as a beacon.

I am testing the nRF52-DK using the original code of "nRF5_SDK_13 ... (more)

44
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Hi, I'm trying to change ad packets in the blinky example. I want to be able to keep blinking but change the ad packs (don't know if this make sense, but main goal is to change the ad ... (more)

#### Statistics

• Total users: 19887
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• Resolved questions: 9424
• Total questions: 22388

## Recent blog posts

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• ### Setting up Segger on a mac or pc and debug - step by step for humans

Posted 2017-05-05 14:03:35 by Lola

Posted 2017-04-11 11:49:17 by Radosław Koppel
• ### Taking a deeper dive into Bluetooth 5

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## Recent questions

• ### On connecting the nRF52 dk board to the PC should two of its LED's glow?

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Posted 2017-05-26 00:00:47 by Starbuck
• ### Re-work hints for QSPI flash on PCA10056

Posted 2017-05-25 22:35:56 by Julie H
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Posted 2017-05-25 19:31:25 by Andrew
• ### remote dfu insufficient resources

Posted 2017-05-25 18:21:50 by Shreyas Shivalkar