# 6,109 questions

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## SDK 12.3.0 - connection parameter config got fatal error

Hi there,

Based on apple recommendation, I've chosen the next connection parameter set (and tested the parameter set works on other platform such as TI and Dialogue chip):

140 #define MIN_CONN_INTERVAL MSEC_TO_UNITS(1979, UNIT_1_25_MS) /**< Minimum acceptable connection interval (1 ... (more)

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## Secure DFU Bootloader debugging for nRF51822_xxAA

I am using example DFU project (bootloader_secure) from SDK (12.3). Chip 51822QFAA. My problem is that I cannot start to debug session in Keil5. Use JLink. I can program target(through J-Link interface) and start the application, but I ... (more)

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## nRF51422 SDK11 app_uart_fifo race condition and fix

Yet another app_uart_fifo question. I'm using SDK 11 with uVision. It is my expectation that, if using HW flow control and a FIFO to RX, no received characters should be dropped at all, under any conditions.

I've noticed ... (more)

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## combine dfu service to nus service failed

Hello,

my sdk is from nRF5_SDK_12.3.0_d7731ad, I added the dfu service to the ble_app_uart project on nrf51822QFAC,but it just could run to serviive_init() function and return NRF_ERROR_NO_MEM.

I have searched the similar problem in the Nordic Developer ... (more)

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## power consumption of S130 (use as peripheral only) vs S110

Hi there,

I was trying to use S110 to implement my project but found there is no more release for that after SDK 8 and I have concerns on bug fixes won't be merged back.

As S130 can work ... (more)

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## Is it possible to know the channel state information (CSI) from nRF chips?

Hi,

I'm wondering if CSI is available on nRF chips. It can be used for advanced sensing purpose. There have been tons of works on WiFi sensing through CSI. Is it by any chance stored in some registers or ... (more)

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## Example for Scan and Advertise at the same time during connection

Hi,

I'm wondering if there is an example for scanning and advertising at the same time during a connection as peripheral? Or is there an example where I can start from? What's the suggestion for intervals and windows ... (more)

30
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## current peak on the nrf51822

Hi,

I wanted to know the peak current of the nRF51822 chip using the softdevice 130.

I was looking through the documentation and found on the S130_SDS_v2.0.pdf the information on page 81 that the peak current should be ... (more)

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## Cannot compile NRF51 Samples

I was compiling a project(ble_app_uart and I am using PCA10028), it was not successful and KEIL5 display this: it looks like I didn't install NordicSemiconductor.nRF_DeviceFamilyPack.8.11.1.pack according to the message (in fact, I already ... (more)

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Hello Everyone,

I am using nrf51822 256Kb Flash and 32KB RAM Raytac's BLE module with SDK11, S130 with over the air Bootloader (16Kb).

So the aim is that when a particular condition is true, data "1" is written to ... (more)

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## nRF51822 beacon example on custom board

Hi there,

I'm trying to run the beacon s130 pca20006 example on a custom board. There are 2 main differences between the pca20006 and my board:

• There is a 32 Mhz oscillator on my board
• There is no LF ...
(more)

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## RTT Viewer doesn't always work

Not really a question - I have had trouble with J-Link RTT Viewer for some time, when it works it's a very useful tool, but it was only working about 25% of the time. This evening I had a flash ... (more)

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## Application code jumps to Oxfffffffe after sd_softdevice_enable

Hi, i am creating a new project iar workbench 7.8 with SDK V8.1.0 and softdevice V8.0.0 using custom board nrf51822 ic revision 3 (QFAAH00),clock source as "NRF_CLOCK_LFCLKSRC_RC_250_PPM_8000MS_CALIBRATION" for ble_stack_init(),after sd_softdevice_enable() code will not ... (more)

27
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## S140 6.0.0-6 alpha start address to make monitor debug mode work

Hello,

I'm trying to enable the monitor debug mode work with iar but I have some doubts about the address used in the EnableMonMode.mac macro provided in one of the blog here.

The address is "SetMonModeVTableAddr=0x1B000". I ... (more)

30
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1

## How to connect nRF51822 using adxl345 SPI? needed help

Well, I have question for this SPI connection problem. anyway,I have nRF51822 core board using adxl345 with SPI connection. that connect SDA to P5, SDO to P6, SCL to P7, CS to P8. this program works fine till connect ... (more)

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## How to trigger ADC from a timer interrupt, while generating PWM with the same timer and while using BLE on nRF51822?

Hi. I am a newbie in Nordic chips, quite knowledgeable in Atmel AVR, though. I'm working with an nRF51822 on a board like this https://www.waveshare.com/wiki/BLE400. I use the Mbed environment.

What I'm trying ... (more)

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Hello,

I have nrf51 beacon that is protected from read. I want to recover it (erase and disable protection) but I only have st-link programmer. How can I do that? Maybe someone can tell me what nrfjprog --recover actually do ... (more)

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## NRF51822 Secure Bootloader with app_timer

Hello everybody,

i want to add a timer to my secure bootloader example, so it waits some time and then, if no DFU is in progress, starts the beacon apllication automatic if there is one available.

I tried this by ... (more)

571
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1
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1

## iOS nRF Toolbox tx/rx characteristic?

Hi all, I'm using the nRF iOS Toolbox as a reference to design an app. Can someone please help me in terms of which swift code file I need to use to read and write data to the nrf51 ... (more)

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## Connect via external MCu

Hey, I am using WT51822-S4AT module and want the nrf51822 to connect to phone. I don't have nrf51-dk. I am using stm32f0-discovery kit. Can it be done using that kit? I searched for examples but coudn't find anything.

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## how to convert 2's complement ADXL345 data to nRF51 UART? needed help

finally I have done to implement that ADXL345 can throw data over BLE using nRF UART app service with this code. now my problem is how to change 2's complement ADXL345 data to array of string/character.

here it ... (more)

36
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## Connectivity issues in damp/wet weather

Looking for some advice on how to handle connectivity issues in damp/wet weather.

We've found that our NRF51 device works well indoors, but when placed outdoors overnight, the ability to connect to the device can fall to near ... (more)

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## Pairing and Bonding Method in nrf51822

Hi guys,

I am currently using nrf51822 with SDK 11. I use Peer Manage to deal with paring and bonding encryption in BLE connection.

Please correct me if I am wrong but in "Just Work" mode, the nrf51822 connect and ... (more)

39
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## BLE support for having multiple active connections (to multiple centrals) with NRF51822 while it works as peripheral

Hi all, I'm asking on both BLE specification version 4.0 (or more) and NRF51822 S130 about having support for multiple central connections at the same time while our NRF51822 device works as the peripheral role.

Base on the ... (more)

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Hi Guys,

I am new in BLE world, so sorry if I ask stupid questions.

I have a Simblee RFD77101 and a nRF 51822 chip. I would like to connect from nRF51 to Simblee and change data via BLE.

I ... (more)

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## How to know if nrf51 is protected from readback or not?

Hello DevZone community, Currently I am using nrf51822. Could you guys please tell me how to enable code protection besides check the "Lock entire chip from readback" in nRFGo studio? I have tried to add uicr_config.h in to my ... (more)

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## How Receive ble_uartservice using pc serial console, but can't loopback ADXL345 data using nRF51 UART.needed help

This is my coding implementation using mbed online compiler mbed code and this is serial pc result

and this is the result over BLE using nRF UART app

how this program using serial pc console not synchronize with ADXL345 i2c ... (more)

31
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1

## Program only works in SES and not standalone

Hi, I'm using blinky from the SDK12 as an example here with a nordic nrf51 DK (pca10028, onboard nrf51422) which I am using as a programmer with a custom board (with a nrf51822_XXAA). I can flash, verify etc fine ... (more)

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## how to use CMSIS-DSP library on nrf51822

Hello,

Is it possible to run CMSIS-DSP library on nrf51822, I would like to use the FFT function for analysing the accelerometer raw data on nrf51822. Is anyone have already run it on nrf51822 that without FPU.

Thank you.

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## nrf51 BTLE frequency hopping certification

Hi,

I have been tasked of developing a custom BTLE test software for nrf51822 for purpose of certification.

The lab is asking for a custom test that ignores the pairing state and transmit continuously in hopping mode.

I trying to ... (more)

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• Resolved questions: 11252
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## Recent blog posts

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## Recent questions

• ### app_timer / softdevice S132 / sd_app_evt_wait

Posted 2017-12-13 10:01:18 by Mark.Thielen
• ### nRF52832 Power on Reset and nRESET

Posted 2017-12-13 09:03:45 by ogura
• ### Behavior when a single PPI channel triggers 2 timer tasks

Posted 2017-12-13 08:30:21 by XavierYin
• ### Where to put APP_TIMER_DEF without error or warning?

Posted 2017-12-13 08:29:12 by tyler