# 21,591 questions

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Hello,

I connected the nrf module to jlink as described:

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


23
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## libfixmath nRF51 example project

This is probably a sign that I should upgrade to nRF52 (with a built-in FPU) but, in the meantime, does anybody have an example of the libfixmath library integrated with an nRF51. My attempts, so far, have resulted in compilation ... (more)

30
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## Sending Char Data via BLE w/MPU6050-nRF51822

EDIT: I used a workaround to get my project working but my question still remains. I just used the template project to send data to my app and manipulated the received data inside the app. I must say I was ...

(more)

3
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## Installing micro-ecc issue

Hi,

I am following below step for Installing micro_ecc_lib_nrf52.lib.

1. Install version 4.9-2015-q3-update of the GCC compiler toolchain for ARM. You can use ARM's Launchpad to find the toolchain for your operating system. - DONE

2. Make sure that make ...

(more)

9
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## BLE Advertising, a beginner's tutorial

Hello everyone,

Lately I have been struggling while trying to run "BLE Advertising, a beginner's tutorial". My hardware consists of NRF51822 and PCA1000 dongle. I use SDK_11.0.0 and the example provided at github https://github.com/NordicSemiconducto ... (more)

11
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## Softdevice memory Consumption

Hi,

How much memory will be consumed by softdevice s132 and s130 in Flash?

64
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Hi,

I am having hard times to make SAADC working on DK-52, SDK13, S132. I need to perform a voltage measurement on command received from a connected device.

AIN pin is connected as in the following picture:

I also have ... (more)

17
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## how to flash programs on nrf51822 via nrf51 DK

and how to hijack nrf51422 with nrf51822 custom board using nrf51DK

27
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## Is there any way to change my Gmail password on my iPhone? [closed]

I forgot my current password of my Gmail account. I also don't add any recovery information in my Gmail account and this account is very important for mine. So if anyone has the solution for my problem please tell ... (more)

11
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## Failed to disconnect from iOS device after several times

Hello. I am developing a project on nRF52832 using SDK 13, in which I need to transfer up to 300 bytes of data from iOS device via my dedicated app (in the background) to nRF in 10 second cycles. Project ... (more)

34
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2

## CRC error in bootloader when watchdog is enabled

Hello,

I encountered a crc check error when update application via bootloader. The SDK version is 12.2.0. I found that this error is related to watchdog.

In the beginning, I add watchdog initialization code in application and add ... (more)

11
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## ant heart Page0 beat_count and beat_time calculate question

Hi I use SD310 and nRF51 in SDK10 and The Ant is set HRM_MSG_PERIOD_1Hz.

I integrate a heart rate module by I2C and the heart rate data is only all I got.

But the Cell Phone Ant Plus Sample App ... (more)

6
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## NRF24LE1 XOSC16M not Starting

Hello,

Issue: XOSC16M is not Starting and the loop stuck forever in below line

while(!pwr_clk_mgmt_is_cclk_src_xosc16m());


where it checks CLKLFCTRL 's 3rd bit to confirm is XOSC16M is active or not.

PCB Design Detail

• Taken from Reference Design provided by ...
(more)

37
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## NRF 31512? Where is the datasheet?

Hi, can someone tell me what chip this is and where I can find the data sheet? Or at least if this is a custom fabrication, what chip from Nordic is it based off of? Thanks!

11
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## BLE hid keyboard and Gazell at the same time [closed]

Hi there,

My scenario is the split keyboard which has 2 parts: left-hand part and right-hand part. Each part has a NRF52832. I am willing to implement the left-hand part to be a BLE hid keyboard and also connect right-hand ... (more)

21
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## Bluetooth Development Studio with Nordic plugin for SDK 13

Any update on possible when Nordic can update the Plugin to support SDK13?

I was informed that the Nordic Semiconductor v1.2.2 plugin does not support SDK13.

Although I see there is a description under SDK13 that indicates it works. Here

46
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## What will the range be with a ble 5 server, but iphone with Bluetooth 4

If I used a nrf52840 bluetooth5 as a server, but customers have iPhones with Bluetooth 4.x on, will the range still be 2x or 4x, as stated by BT SIG?

Did Nordic test the range with Bluetooth 4.x ... (more)

26
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2
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## Hardware design and antena

Designing a custom pcb, we have a few questions, and maybe you could help a little bit.

On this Nordic design ,before proceeding to layouts :

1. Can I skip pins 45/46/47 and not puting L2/L3 ? I did not ...
(more)

16
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## what is the __data_start__ ??

I'm setting the eclipse developement enviroment without makefile provided by Nordic.

But following messages apear at linking phase..

C:/Users/isp40/OneDrive/Keil_projects/nRF51/nRF5_SDK_11.0.0_89a8197/components/softdevice/common/softdevice_handler/softdevice_handler.c:442: undefined reference to __data_start__'

C ...
(more)

86
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1
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1

## Isn't it possible to debug the cortex-M of the other vendors by using PCA10028 J-Link OB?

Isn't it possible to debug the STM32F MCU by using PCA10028 J-Link OB??

24
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1
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1

## how to flash NRF52DK under ubuntu

Hi, I am using NRF52 DK board. I use nrfjprog under windows to flash controller. But i want to flash under ubuntu. I searched but i found one .rar file.i extracted but there were not executable to run. some ... (more)

51
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1
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1

## Is SD with WDT IRQ set to priority-zero a problem?

The basic question is: if I initialize the SD and then forcibly change the priority of the WDT IRQ to zero via NVIC_EnableIRQ(), will that cause a problem?

I know you don't normally want to do anything which might ... (more)

22
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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)

50
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## Unable to Read or write MMA8652 registers using TWI

hi i am working on MMA8652 i am working on mma7660 twi example in sdk11 for nrf52. i have changed the registers as the same way the MMA8652 need. here is my read ... (more)

13
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## TWI: prevent repeated start between non stop transfer

Hi,

I am debugging an SSD1306 OLED library, and in the datasheet, it does not explicitly mention support for repeated start bits. But using the nrf_drv_ API's with NRF_DRV_TWI_FLAG_TX_NO_STOP flag set, the successive nrf_drv_twi_tx or nrf_drv_twi_xfer` function starts sending ... (more)

13
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## nRF52382 Zimpedance(RF)

Hello! I'm calculating the matching circuit with the antenna for nRF52832, but nowhere can I find the impedance value of the pins of the radio part, can you help me?

20
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## How to determine the App RAM base address in the linker script?

I understand part of ram is used by the softdevice, but I see different addresses are used in different examples that use the same softdevice, namely S132. For example,

in ble_app_hrs/pca10040/s132/armgcc/ble_app_hrs_gcc_nrf52.ld, RAM (rwx) : ORIGIN = 0x20002c38 ... (more)

16
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## DFU reconnect problem

Hi!

I am having trouble with DFU. When I try to send new application via NrfConnect, device goes to bootloader, but file transfer is not starting. Only when I reconnect and try again, while device is in bootloader, transfer goes ... (more)

21
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## custom_board.h for sdk v12.2 and v13.0

In my nRF52832 base-board, I don't have any leds and buttons. I use Keil v5 and I used ble_app_uart_pca10040_s132. I copied pca10040.h as custom_board.h and replaced BOARD_PCA10040 with BOARD_CUSTOM in proprocessor symbol. when I removed led definitions ... (more)

9
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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)

#### Statistics

• Total users: 18322
• 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

Posted 2017-03-29 11:27:02 by Håvard
• ### 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

## Recent questions

• ### nrf51822 - jlink 0.76V

Posted 2017-04-23 23:10:29 by normanfust
• ### Installing micro-ecc issue

Posted 2017-04-23 22:06:28 by dc
• ### BLE Advertising, a beginner's tutorial

Posted 2017-04-23 20:59:29 by chocol8
• ### Softdevice memory Consumption

Posted 2017-04-23 17:51:46 by yash
• ### how to flash programs on nrf51822 via nrf51 DK

Posted 2017-04-23 14:52:41 by krt