# 23,725 questions

8
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## Real UART TX transmit depth?

I was wondering if anyone has done any extremely high speed UART work on the nRF51 (or the non-EasyDMA module on the nRF52). I need to improve performance for an existing prototype that has to stream a large amount of ... (more)

512
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1
vote
3

## SPI Master MISO Noise Issue

I'm trying to connect to a ST LSM6DS3 via SPI on the Nordic chip. I have used SPI on Nordic with other peripherals but couldn't seem to get it to work with this ST chip. Eventually, after debugging ... (more)

21
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2

I'm having some issues getting any of the provided experimental Thread examples to compile with IAR version 8.11.2. I'm using an nRF52840-PDK with the SDK for Thread version 0.10.0. Please see the following image ... (more)

511
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1
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2

## nRF51822 POFCON setting at VDD 2.1V

Hello,

I wonder how power failure comparator works at VDD 2.1V. If VDD goes down to 2.1V, and I set POFCON enabled at 2.1V threshold, then does POFWARN work? How 2.1V threshold is produced by VBR?

Thanks..

51
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1

Hi,

I'm trying to get the RSSI of incoming 802.15.4 packets using otLinkRawGetRssi(), but I need only RSSI from one specific device. I tried to use whitelist (otLinkSetWhitelistEnabled(), otLinkAddWhitelist()) and I checked in CLI that whitelist is ... (more)

8
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## app_timer_freertos.c/app_timer_stop bug?

nRF5_SDK_12.2.0. app_timer_freertos.c app_timer_stop() call xTimerStop/xTimerStopFromISR with timer_id parameter. It seem to must use hTimer parameter.

It's bug?

99
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## Are there any particular practices or instructions should i follow if I want to write a custom library

Are there any particular practices or instructions should i follow if I want to write a custom library

We are trying to write a library for LEACH protocol and it is a network algorithm and we can't find an ... (more)

6
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## fstorage in chosen area

Hello, I'd like to store a large amount of data in flash and in a chosen area. As a start, I've chosen the area starting from 0x77000 and ending at 0x78000 Iv'e written this

const tGlobalData romData ...
(more)

9
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## my remote 3 of the nrf52's kits doesn't appair on bluetooth with windows or ubuntu?

hello I am on 2 projects the nrf51 and the nrf52 , but I met some problems about the bluetooth on ubuntu and windows . Can you help me please ?

6
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## get app timer current count

Hi,

i set the app_timer to fire every 60 seconds app_timer_start(m_Timer_id, APP_TIMER_TICKS(60000, APP_TIMER_PRESCALER), NULL);

Is it possible to get the current couter,for example, after 30 seconds?

I need to have an RTC counter discretized to milli seconds ... (more)

13
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## BLE_EVT_TX_COMPLETE in S132 v4.0.2

Hi,

I am working on testing this modification on the ble_hrs example. The idea is to send data sequentially as notifications.

However, BLE_EVT_TX_COMPLETE seems to have disappeared in S132 V4.0.2.

By looking at the infocenter, I notice sd_ble_gatts_hvx ... (more)

21
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## How to print out the time stamp in nRF log [closed]

Currently developing on NRF52 sdk12

I want to be able to show time stamp minutes:seconds:miliseconds on my RTT viewer, when I print my data out from the uC. Any hits on how to do that?

I'm looking ... (more)

31
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1

## I2C communication issue

hello i am using nrf52840, with BME280, i have external pullup 10k resistor. how i can disable the internal pullup resistor. i am using this sample code.

https://github.com/Martinsbl/twi-find...

14
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## Android device as IPv6 BLe Server sending UDP packages

Hi,

i'm currently try to figure out how to use an Android device as an IPv6 Server through BLe sending UDP packages. One of my collegues tried this example as it was discribed with an Rasberry Pi as edge-server ... (more)

131
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2

## What is the maximum number of bonds possible when using peer manager?

I am creating a BLE peripheral device and I am using peer manager in it. What is the maximum number of peers that my device can bond with? And what will be the result when a central wants to bond ... (more)

20
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2

## nRF24L01 Ack issue / tx giving max_rt error / PIC18F25K20

Hi,

I am having problem with setting up TX side of my project. It always giving me max_rt error if I am sending only once per cycle. 1 Cycle is every 30seconds. All working fine without ACK enabled, with ACK ... (more)

11
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## HID Mouse/Keyboard Example on nRF51 Dongle

I want to run the HID Mouse and Keyboard examples on nRF51 Dongle. How I can configure it first, to connect with my PC via Bluetooth and second, to configure the GPIOs act like buttons, since the dongle doesn't ... (more)

14
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## PPK won't output over 2.2V on nRF52832 Preview DK

Hi, No matter what I adjust, I can't get the PPK to output over 2.2V. I happen to be using an older nRF52 preview DK (figured it'd be a good use for that board now that it ... (more)

32
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## LIS2DE12_SPI problem

Hello I try to control the LIS2DE12 accelerometer to detect movement through the pin INT1 For this I wrote the program below but I tell problems (I feel that there is a problem with the Read and write function) Thank ... (more)

45
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## How to add timestamp in RTT viewer using NRF log module

Currently developing on NRF52 sdk12 with a terminal

In my source code i have nrf_log_init(null), and this allows me to print stuff to the RTT viewer.

Now I want to be able to show time stamp minutes:seconds:miliseconds ... (more)

30
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Hi,

I use the SDK12.3 and SD130 with secure_bootloader and my own application. I can flash SD and Bootloader and update my app over OTA with DFU from NRF Toolbox. My app works fine after updating. I implemented the ... (more)

31
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1

I noticed that when upgrading to the latest Thread SDK that my devboard stopped booting. I was following the instructions as per the documentation but noticed that my user application stopped booting. I was following the instructions to the tee ... (more)

21
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2

## BLE nrf52832 SDK11 characteristic update with every read operation

I am using Nrf52832 sdk 11.I want to update the value of characteristic on every read operation from my andriod phone. I want that on every ble_gatts_evt_read: should give me new value whatever i feed through code. How should ... (more)

37
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1
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1

## External Crystal Oscillator for nRF51422 for custom PCB

Hi,

I am designing a custom PCB using the nRF51422. I want to include an external 16 MHz crystal oscillator to use as X1 according to the reference layout for custom PCBs. The crystal I have has a capacitance of ... (more)

18
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## ble_app_uart_c on a custom board with NRF52832-QFAA-R7

Hello, I am working on a custom board with NRF52832-QFAA-R7 and trying to run ble_app_uart_c on it. I am using uVision 5.23.0.0

1. The first trouble that I am facing is that I can't get the softdevice ...

(more)

25
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## Getting device address in ble_app_hrs central

Hi All, I am a beginner in nrf52. I need to get the client device address in ble_app_hrs_central, because I have more than one devices connected. There is a hrs_c_evt_handler in the main.c which is called when a client ... (more)

22
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## Disable NFC Interrupt

Hi,

The NFC function is set to read only in my application. I don't want to wake up my system when someone tap on my device to read the NFC data. (assume this method can save more power)

Should ... (more)

45
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## Where is a basic example of the nRF52 using soft device s132, and segger debugging on linux using gcc

I am searching for a basic example to understand the build system.

How do I load the soft device properly?

How do I set things up to run SEGGER_RTT_WriteString?

I had working code, but migrating to SDK 12.3.0 ... (more)

30
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2

## Interrupt priority each 100us

Hi,

I have to make a interrupt each 100us. This interrupt should be priority on the BLE. In my interrupt I have only one condition (if/else) and I have to change PWM value.

Is this a problem ? Can I ... (more)

20
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## Certification of a PCB with different pin-to-pin nRF52 chips

Hello! We use chip nrf52832(QFN-48) in our project and we wont to pass the PCB certification. But we also want to use chip nrf52810(QFN-48) in another project, but with a PCB from the first project. Should we again ... (more)

#### Statistics

• Total users: 23023
• Latest user: Numbers Arnott
• Resolved questions: 9857
• Total questions: 23725

## Recent blog posts

• ### Introducing nRF5 SDK for Mesh

Posted 2017-07-20 09:42:44 by Pär H

Posted 2017-07-19 06:53:42 by Mohammad Afaneh
• ### Unique Thread/Bluetooth multiprotocol solution with nRF5 SDK for Thread and nRF52840 SoC by Nordic

Posted 2017-07-14 10:31:56 by Krzysztof Loska
• ### nRF Connect macros (currently Android only)

Posted 2017-07-14 13:29:14 by Aleksander Nowakowski
• ### Power Optimization — From 3 to 7 Months on a Single Charge

Posted 2017-07-10 14:34:39 by Yaniv Nis

## Recent questions

• ### Real UART TX transmit depth?

Posted 2017-07-22 01:21:21 by samsonc