# 16,670 questions

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## nRF51_SDK12.0.0 ble_app_uart debug problem

I use IAR to debug nRF51_SDK12.0.0 ble_app_uart example application. The origin application is for nrf51422, and my device use nrf51822. Therefore, I first change the device to nrf51822 on the example application. I also preprogram the softdevice 130 ... (more)

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## SPI issue on nRF52

I'm using nRF52+SDK11.0.0+S132 with an application based on the ble_hrs example.

In main(), if I call nrf_drv_spi_transfer() to configure some SPI sensors before calling ble_advertising_start(), then my code spins in spi_xfer()'s while (!nrf_spi_event_check(p_spi ... (more)

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## app_timer not constant

Hello, I'm using BLE, RTC and app_timer to blink a led. I blink the led 10 times when I receive an order from BT (by means of NUS), and then by means of RTC.

uint32_t initBlink()
{
app_timer_create(&m_seq_timer_id,APP_TIMER_MODE_SINGLE_SHOT ...
(more)

17
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## sd_ecb_block_encrypt not working

I am a newbie in embedded programming. I want to encrypt some advertising data using aes-ecb API, provided by the softdevice but I am not getting any encrypted data after calling sd_ecb_block_encrypt function. I am using this function to encrypt ... (more)

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## SDK12 and FDS

Hello

We are about to move an old design based on the NRF51 to the more powerfull NRF52. In this context we would like to use some of the new API’s that has been introduced in the latest SDK ... (more)

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## Android: Read characteristic without service discovery

We are writing an Android app for our own peripheral (nRF51-based). We know the handles for all the characteristics.

On Android gatt.discoverServices() needs to be called, and wait for onServicesDiscovered(), then getServices(), before the Characteristic object is available.

This ... (more)

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## Baremetal + ble module

Hi,

> Context:

I run a baremetal application that I would like to enhance with bluetooth. I am considering a BLE module from NS.

• I currently have a SoC (nanopi m1) and I don't want to fiddle with the BLE ...
(more)

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## HFXO start time before connection event

Hi.

On nrf52, according to http://infocenter.nordicsemi.com/inde... it takes about 0.36 ms for the HFXO to start, and I guess that includes the time for it to become stable.

But as shown in https://devzone.nordicsemi ... (more)

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## range test

Hi, I am thinking of using the nrf24l01 board from Banggood ([here]) to build a transmitter/receiver set for r/c model planes. However one of the things I would like to do is implement a range check function. On ... (more)

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## nRF51822 to MicroSD - High Level

Hi there, I'm definitely a newb when it comes to wireless communication and communication protocols so I'd like this question to be answered at a higher level than what I've read on a prior "Mass storage with ... (more)

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## iPhone7 + nrf52 + SDK12/s132 doesn't connect

I have an odd situation. I've been using an iPhone 5 and 6 to connect to, and test against, both an nRF51 (redbear nano) and the same code built for nRF52. It works fine.

Today I provisioned an iPhone ... (more)

194
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## nrf52832 flash programming

Hi,

Is there an extensive documentation about programming process of a nrf52832 using keil? I just spent hours figuring out that I had to use Softdevice erase flash algorithm to get rid of a laconic "programming failed" under keil. I ... (more)

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## arduino primo core

Hello Nordic,

I just read the news from may about the arduino primo and i am really exicted!! I have been tring to decide between arduino due, or some complex ensemble of nrf52 module with DIY circuit im not sure ... (more)

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## how to adjust the capacity sensor sensitivity of NRF52

the application is examples\peripheral\csense , cap sensor can sense my touch, but when I cover a 1mm acrylic on the cap sensor, will not sense my touch. so I want to know how to change the compare time? I ... (more)

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## Can i Program an external STM32 board through SWD of nrf51DK?

Can i Program an external STM32(m3) board through SWD of nrf51DK?

i can program 51882 external board.it is ok.. but i need to progam an external stm32 board with jlink port.

I just use the nrf51dk as JLink ... (more)

23
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## Linker stage fails with missing reference to _start

Hey I am trying to create a blinky project from scratch on System: MAC OSX Eclipse Neon GCC 4.9

I am trying have it eclipse managed make.

I am at a point when after the compilation during the linking ... (more)

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## Eclipse neon managed make, fails to generate the right code

Hey Guys,

I am trying to create a workflow for creating new project from scratch in eclipse, traditional way with nRF5 sdk provided make file is not scalable and it really painful.

31
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## TWI Will Not Return Slave Data

We are using a MMA8452Q accelerometer connected to an nRF51822 via TWI using the twi_hw_master. Reading the WHO AM I register is the first attempt to get the TWI running but no data is returned.

#define ACCELEROMETER_ADDRESS       0x1C           // if SA0 ...
(more)

35
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## DFU Errors

I am currently dealing with a strange problem when trying to use DFU OTA. When I enter DFU mode on Master Control Panel and try and update I get the following two error messages. "Device does not have required DFU ... (more)

35
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## UART Baud rate Macro

Hi All,

i am using nrf51822 with SDK 12 and i am not able to find where All BAUDRATE Macro is defined for APP_UART.

so anyone can tell about that in which file it is located in SDK12.

Thanks Shanky

8
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## Accepted GATT status for write authorization reply?

I'm sending a write authorization reply using sd_ble_gatts_rw_authorize_reply() in response to a standard Write Request with one byte of data. When I set the gatt_status to BLE_GATT_STATUS_ATTERR_REQUEST_NOT_SUPPORTED, the reply() function returns NRF_ERROR_INVALID_PARAM. However, if I set the gatt_status to ... (more)

11
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## DFU not working SD 3.0.0

Setup

nRF52 - Rev 1 SD 3.0.0

internal RC for timer

utilizing the provided secure bootloader, and the DFU buttonless template source.

Created/compiled the 2 images so I have: - bootloader - App - SD 3.0.0

perform the complex ... (more)

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## Service is empty issue of nrf connect for UART service

Hi ,

I am working on one application in which i am using UART service. Whenever i am connecting to device using nrf connect or master control pannel app, UART service empty massage appears.

Why the service is not getting discovered ... (more)

74
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## Android dropping packets

I have created a nRF52 based peripheral device which is used to stream sensor data to a connected central device, usually an iPhone. I can stream data, reliably to the iPhone up to 104 packets per second with very little ... (more)

29
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## nRF Toolbox DFU doesn't work with iOS10

I have used nRF toolbox to update bootloader and firmware to my nordic device. I was previously using iOS9 (I believe 9.3.5 - whatever the latest version was before iOS10).

Now, I notice two problems.

Within nRF toolbox, in ... (more)

45
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## nrf-ble-bcast mesh compilation issues

Hi,

I want to run BLE mesh network example on my Dev board to understand it better. I am running it on SDK v8.1 and using ble_app_proximity example S130.

I am using ... (more)

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## Flash Storage problem nRF52

I'm having no success getting the FDS (Flash storage) to work on my nRF52 PCA10040 board with SD130 2.0.0 and SDK11. I am using the Nordic example on Github here: https://github.com/hubuhubu/nRF52-fds...

My system ... (more)

51
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## How to implement the mqtt client (IoT SDK) with IPv4 instead of lwip.

I am implementing mqtt client on Nrf52832 with the example provided in the IoT SDK. I am looking for the correct way to make the client to run with Non-Nordic socket stack. The details of my problem is in the ... (more)

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## How to get my J-Link Uart Port work?

Hi,

As a beginner, I'm trying to have CDC J-Link Uart port work with my laptop. I'm using nRF52 board. When connecting the board to my laptop (windows 10), it displays the following in device manager:

Actually, I ... (more)

25
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## Can I use simple_adc_pca10028 example project for getting multi ADC data?

I need to get three ADC data from acceleration sensor with nrf51822. I tested getting a ADC data using simple_adc_pca10028(Keil_v5/ARM/Pack/NordicSemiconductor/nRF_Examples/11.0.0-2alpha/peripheral/adc_simple) example. But I don't know how to get multi ... (more)

#### Statistics

• Total users: 13955
• Resolved questions: 7251
• Total questions: 16670

## Recent blog posts

• ### Segger Embedded Debugger version 3 and how I got it to compiling

Posted 2016-09-24 17:00:38 by Morten
• ### How can you make code run faster? Analysing micro-performance with the nRF52

Posted 2016-09-09 12:19:54 by RK
• ### nRF5 SDK v12.0 now available - bringing more secure over the air updates and more.

Posted 2016-09-08 11:26:35 by John Leonard
• ### Smart Remote 3 for nRF52

Posted 2016-09-07 14:55:44 by John Leonard
• ### nRF5 Series - a popular platform for open source RTOS

Posted 2016-09-07 17:00:34 by Eirik Midttun

## Recent questions

• ### nRF51_SDK12.0.0 ble_app_uart debug problem

Posted 2016-09-26 04:00:47 by Fiske
• ### SPI issue on nRF52

Posted 2016-09-26 02:55:30 by Tosa
• ### sd_ecb_block_encrypt not working

Posted 2016-09-25 16:44:37 by Amit Chahar
• ### Android: Read characteristic without service discovery

Posted 2016-09-25 13:58:35 by PVS
• ### HFXO start time before connection event

Posted 2016-09-25 13:51:35 by Emil