# 13,377 questions

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## GPIO port input in low power mode

Hello, I'm new to the Nordic SDK and I would like to ask you for help with implementation of PORT events for revision < 3 in "low power" mode instead of "high power" mode. I have following implementation to check ... (more)

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## Any nRF52840 examples for BLE Mesh?

Hi all,

I have three nRF52840 DK. I would like to play around with Bluetooth Mesh, but I can not find any examples. It would be perfect if in the end I will have a gateway (connected to e.g ... (more)

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## Can not find Nordic dongle from my application

I have an application that do SW download to STM32L151 processor using NordicDongle with MasterEmulator.dll (Version 2.1.13.14) It works good on my desktop windows 10 computer. When I am installing the application on a windows 10 ... (more)

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## Can’t program BT832 Module using NRF52-DK

I have read articles on the forum, watch youtube but still no luck. Actually I failed to find step by step tutorial how to do it from start to the end. Most of them touch wiring stuff only.

Hardware:

• NRF52-DK ...
(more)

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## Is there any Dc offset on nRF52840 RF port ?

Is there any Dc offset on nRF52840 RF port? Is it necessary to add a DC blocking capacitor if the load has DC path to ground?

In particular Is it OK to connect a 50 Ohm termination resistor after the ... (more)

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## buttonless dfu in sdk 14

After migrating from sdk 13 with buttonless dfu based app I meet follow error: my app get FATAL error after exactly 3min. I guess it something related with power down mode or like that but can't find where is ... (more)

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## Adding a service to existing SDK example code

Hello, I am trying to add an extra service like "experimental_ble_app_blinky" into "ble_app_hids_keyboard" example code. "ble_app_hids_keyboard" example code has 3 servcies HID, Device info and battery info services, I would like to add the 4th service, like a custom service ... (more)

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## Device crashes when debug flags are turned on

I am writing firmware for a BLE Nano device using the Nordic SDK 8.1. I was having problems where my device would suddenly stop printing to UART and stop trying to bond with ble peripherals also. It seems like ... (more)

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## nrf52832 of UART problem

i am using uart of nrf52832. the SDK is nRF5_SDK_12.3.0_d7731ad. the uart is app_uart .when i was testing the uart sending and receing .i find that the uart is stoping where
while (!nrf_uart_event_check(p_instance->reg.p_uart, NRF_UART_EVENT_TXDRDY)) in ...
(more)

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## RTT Stability

Hi

How stable is the RTT module and how trustworthy is it?

It is marked as unstable and I do not get any messages from the modules.

I use:

• #define NRF_LOG_BACKEND_RTT_ENABLED 1
• #define NRF_LOG_ENABLED 1
• #define NRF_SDH_BLE_LOG_ENABLED 1
• #define NRF_SDH_LOG_ENABLED ...
(more)

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## HardFault with GPIOTE & SD

Hi!

I am getting a HardFault when I try to read a GATTs value inside a GPIOTE ISR handler.

I already tried setting the ISR priority to low as suggested in various posts.

Here is my code:

#include "app_settings.h ...
(more)

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## Calculate time until next RTC Interrupt

Greetings -

I am using (the slightly out-dated) 12.3 SDK with a nRF52840. I'm also using s132 as my softdevice.

As I've been slowly reducing my RTC interrupt frequency to cut down on power consumption, I have a ... (more)

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## EVENT_ADDRES and EVENT_END timing on coded phy

Hi,

The tx/rx sequence diagrams don't explain when EVENT_ADDRESS and EVENT_END are triggered when using coded phy:

• there are CI and TERM1 fields between address and S0 so EVENT_ADDRESS is generated directly after address or directly before S0 ...
(more)

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## UART interrupt event handling on SDK14.0.0

Hi

I have an application where I cannot use the FIFO buffers (HW or SW). Therefore I need an interrupt for each received byte. If I try to use the uart driver (nrf_drv_uart.c) I have problems enabling the RXDRDY ... (more)

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## Programming an nrf52832 board with ST link V2 and keil issue

Hello,

I've been trying to program my nrf52832 board with an st link v2 dongle or an st32 disco board with no luck with eclipse(Didn't find a dedicated tut for using all) and found keil to maybe ... (more)

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## Can I combine beacon code and HID keyboard code?

I need an application that always advertise the beacon information, such as RSSI and Major and Minor value. At the same time I would like to transmit HID keyboard code. Is it possible to combine these two code? I read ... (more)

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## HID Mouse test app for iOS?

Am building a HID Mouse device, starting with the nRF52-DK as hardware target and the BLE peripheral HID mouse sample app. Builds, loads and runs, apparently fine (i.e., can see target advertising with LightBlue app on an iPhone 6S ... (more)

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## Application file encryption (.bin)

Hello we would like to upload to the cloud the nrfutil generated zip package, however we are worried about the application file security. As far as we know, nrfutils takes the unencrypted .hex file and generates signature in order to ... (more)

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## how to enter "power down" mode in nrf52832

Hello,

I was using the nrf24LE1 where i used hal_nrf_set_power_mode() to set the radios' power down mode. Options are power-up and power-down. This is when i was using the HAL_NRF library.

Now I am migrating functionality to the nrf52832 in ... (more)

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nRF52832 SDK14.0

Hi, how can I protect the bootloader from being overwritten? Ideally, I would never be updating the bootloader so it will be a permanent part of the device. How can I make sure nothing can overwrite/erase ... (more)

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## Issue using NRF_DRV_TWI_XFER_DESC_TXRX TWI master driver

At the very end of this post from Nordic Info center I am doing the exact example at the very end.

http://infocenter.nordicsemi.com/inde...

This is the start to do a transmit read transaction ===>

nrf_drv_twi_xfer_desc_t xfer = NRF_DRV_TWI_XFER_DESC_TXRX(addr ... (more)

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## Fstorage - fs_erase causes connection failure

Hello,

I'm encountering a very strange problem while attempting to run an fstorage fs_erase operation on my peripheral device when the central is connected. This is on a nRF52832, SDK 12.1.0, SoftDevice S132 v3.0.0 and ... (more)

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## Programming external/custom NRF52832 board using NRF52-DK

Hi All,

We are trying to flash our custom NRF52832 board using NRF52-DK+nrf studio. With the same setup that's suggested by https://devzone.nordicsemi.com/questi...

However, from the nrf studio, we can never see the external board ... (more)

15
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## how to arm cross compile pc-ble-driver

Hi all,

I would like to know how to cross compile the pc-ble-driver-py for arm target. Do you please have a prooceding tutorial for this activity?

Thanks in advance and best regards,

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## Usage of Nordic Semiconductors proprietary UART service for commercial products

As stated in the topic. We use BLE to simulate UART. As for now, we have defined our own UUIDs but there would be more straight forward to use the well defined and used one by Nordic. However, is it ... (more)

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## light control mesh example not working

I'm trying to set up a ble mesh with 3 servers and 1 client on an nrf52 PCA10040 dev kit. Upon debugging, I'm getting an error that says: '64, APP_ERROR: C:\Users\sesa463145\Desktop\BLE\nrf5_SDK_for_Mesh_v0.9.2-Alpha ... (more)

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## Application compiles with no errors but still dosen't work?

I am building a Bluetooth Mesh application based on the Mesh Beacon Example, i have written a custom Makefile and got it compiling with no errors.

But when Flashing the nRF51422 with the program, nothing happens. If I build the ... (more)

18
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## uECC.h no such file or directory even after proper installation of microecc library

Hi, I have installed Software backend (micro-ecc) as given in: https://infocenter.nordicsemi.com/ind...

Compiled example: experimental/ble_app_multirole_lesc --> compilation is successful here.

Now i am want to include and use microecc library in my own example, I have modified ... (more)

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## SDK 14 buttonless dfu not building with gcc

I'm using SDK 14 and trying to build the ble_app_buttonless_dfu example. I'm using Linux environment, so gcc for building. When I try to build the example I'm getting an error as below,

Compiling file: ble_dfu_unbonded.c
/tmp ...
(more)

29
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Hi, (I'm a computer scientist, please be kind)

In the below attached image, I have collected the data outdoors (so no signal reflection or signal fading) from a single BLE beacon at two different pre-set power levels. I see ... (more)

#### Statistics

• Total users: 24465
• Latest user: Odette Pemulwuy
• Resolved questions: 10456
• Total questions: 25472

## Recent blog posts

• ### 6 Things to Know about Bluetooth Beacons

Posted 2017-09-22 08:27:00 by Rose Martin
• ### Creating a Keil project for a Bluetooth Mesh example

Posted 2017-09-19 12:08:11 by Kristian Skordal
• ### Using millis() like in Arduino.

Posted 2017-09-18 11:58:04 by schef
• ### Flashing nRF5x firmware using any dumb terminal program via standard serial COM port

Posted 2017-09-18 03:53:40 by Nguyen Hoan Hoang
• ### How to Debug the nRF52 Interrupts — Useful Tips

Posted 2017-09-13 15:15:22 by Yaniv Nis

## Recent questions

• ### GPIO port input in low power mode

Posted 2017-09-24 20:25:18 by michael
• ### Any nRF52840 examples for BLE Mesh?

Posted 2017-09-24 17:06:24 by aszka
• ### Can not find Nordic dongle from my application

Posted 2017-09-24 14:23:37 by ofer
• ### Can’t program BT832 Module using NRF52-DK

Posted 2017-09-24 10:47:56 by Alexey
• ### Is there any Dc offset on nRF52840 RF port ?

Posted 2017-09-24 09:43:40 by Artak