# 388 questions

Tagged
• x
15
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Hello Everyone,

It is unclear to me how a soft-device operates regarding multi-tasking and event-handling. I'm assuming Nordic engineers have their own real-time operating system in place for their soft-devices whereby tasks and events are executed based on some ... (more)

17
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1
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1

## J-Link EDU for nRF52840-PDK, nRF Connect

Can I use J-Link EDU for nRF52840-PDK, nRF Connect, please? Is it sufficient? What the J-Link PRO provides for nRF52840-PDK, nRF Connect that the J-Link EDU does not?

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## nRF52840 Template Project for USB and BLE

With SD140 v6.0.0.6 having been released, will an accompanying example project that demonstrates simultaneous use of BLE and USB be released? Will this be included in the next SDK or if one already exists, could someone post ... (more)

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## Recommandation to quickly test long range and RSSI with nRF52840

HI,

I got 2 nRF52840 dev kits and I'm interested in testing the long range layer (LE coded PHY ) between the 2 modules, also scan for the second module RSSI value.

I was thinking if you can recommend some ... (more)

25
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1
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1

## nRF52840 SAADC real impedance 4,7K ? [closed]

Hi Engineers!

faced with a problem of SAADC impedance too small (4,7K)! We use SINGLE ENDING 8bit mode with following settings:

• Vdd = +3.3v

it means, INPUT RANGE = (VDD/4)/(1/4) = VDD = 3 ... (more)

33
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## How to achieve low interrupt latency from sleep ?

Hello, i'm using a nRF52840 on a PCA10056 and want to wake up from __WFE() with a minimum delay. When i'm using the debugger, i achieve a low latency but without the debugger, the latency is increased by ... (more)

24
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## nrf52840 device not available in IAR targed device list !

Hello,

I downloaded the recent SDK 14.2.0 and installed nRF5x_MDK_8_15_0_IAR_NordicLicense.msi included. When trying to load the ble_app_template in the dev kit I don't seem to find the nrf52840 device in the list under Nordic Semi device ... (more)

30
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1
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1

## central and peripheral communication

hi support team, my nrf52840 is acting as peripheral and my mobile with nrf connect is acting as central. after the connection i am able to read and write my device name, link loss alert, battery notification alerts, immediate alert ... (more)

43
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## nRF52840: coexistance with other radios at 2.4GHz in a given product

Is there native support for hardware coex lines? If we have a WiFi chip that produces a TX Active signal, can we hold transmit from the nRF52840 till that transmit is finished?

35
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## nRF52840 CSP package availability

When do you expect samples of the nRF52840 in CSP package to become available?

72
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1
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1

## NRF52840 PDK BLE Secure DFU Bootloader

files.rar

Hello, I am using nRF5 SDK14.1.0 and soft device s140_nrf52840_5.0.0-2.alph.I can program the board witt the bootloader(both pca10056 and pca10056_debug) successfully and its advertising. I generated firmware package from the application ... (more)

48
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1
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1

## sd_flash_page_erase on nrf52840 takes a long time

Hi

We are seeing a significant delay in a flash-related operation on the nrf52840, specifically using the function sd_flash_page_erase() When we use that function to erase flash it takes up to 3 times longer on the nrf52840 than it does ... (more)

21
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## USB BULK Example of nRF52840 & S140 (v6.0.0-6) & SDK14.1

Hi,

Are there any examples of SDK examples that work with USB BULK communication?

Which example should I use to make usbd_hid_generic example work with BULK communication?

Context flow may not be smooth using Google Translate. Thank you.

26
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## USB & BLE Project of nRF52840 & S140 (v6.0.0-6) & SDK14.0

Hi,

We are currently working on one project.

Initially, the nRF52840 & S140 (v5.0.0-2) & SDK14.0

examples \ ble_central \ ble_app_multilink_central Based on the example examples \ peripheral \ usbd_hid_generic example.

But it does not work at the same time, The usb_start () function ... (more)

33
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1
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no

Hello,

This is my first time working on BLE and Nordic, so this might sound strange. I am trying to update data on the fly when the central requests char data.

I have been setting the is_defered_read bit in the ... (more)

25
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## anyone having problem with the APP_TIMER in SDK14

When using the APP_TIMER in SDK14 I am having a problem with the application stopping. I was using the APP_TIMER to flash LEDs and watch for timeouts in SDK13. when porting the code to SDK14 I am having a problem ... (more)

54
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1

## Minimum preamble length to receive packet on Coded PHY

Hi,

What is the minimum number of symbols in preamble nRF52840 has to receive in order to receive full packet on Coded PHY? I can see that it can easily receive packet with less than 80 symbols received, but don ... (more)

42
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## SDK13 / nrF52832 => SDK14 / nRF52840: math link issue

Hello,

I am migrating a working application from SDK13 / nrF52832 => SDK14 / nRF52840 and during build, i get undefined reference for sqrt, sin and cos functions.

I checked, math options are the same in the two makefiles. What can i check ... (more)

121
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1
vote
2

## Current measurements on nrf52840 pdk with PPK

ble_app_gls_pca10056_s140.hex

Hi, I am new in this field and i am trying to do current measurement on the nrf52840 PDK using PPK, in sleep mode(sd_power_system_off) i get average 40 micro amp which suppose to be 0,6! while ... (more)

41
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## nRF52840 USB CDC ACM Windows 10 Unknown USB Device

Hi,

I compiled (using ARM GNU) and run the USB CDC ACM example found on SDK_14_0_0. I have windows 10.

Windows 10 do not reckognize it as a CDC device and instead I am getting an 'Unkown USB Device (Device ... (more)

69
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## central and peripheral nrf52840

hi, i am having a doubt. now my nrf 52840 is acting as a peripheral. it is advertising some packets and my mobile is acting as a central and receiving the advertising packets. after the connection is made i want ... (more)

21
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2

## No RTT Viewer output if no call to nrf_pwr_mgmt_run()

Hi!

I've based a new project for the nRF52840/S140/Preview-DK on ble_central/ble_app_uart_c.

I use the NRF_LOG_XXXX macros for debug and they print fine in RTT Viewer.

However, I do not need any powersave in my app but ... (more)

49
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## SD140 6.0.0-6-alpha BLE issues

Greetings -

I recently downloaded the latest SD140 images, 6.0.0-6-alpha, and began having issues with BLE communication.

I'm developing a custom device, based on the nRF52840, and we require both BLE and USB communication. The USB peripheral seems ... (more)

28
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1
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1

## undefined symbol error

hi, i want to add uart function to my application. so i added necessary .c files to my project. if i compile the program i am getting these errors.

when i change the values sdk.config.h file

#ifndef APP_UART_ENABLED ...
(more)

54
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1

## Add UART1 to bluetoothds example on nrf52840

Hi, I need some guidance or an more in-depth example on adding the necessary code to read/write on the UART1 using the serial module or something else. Everything I've tried so far causes a fatal crash when attempt ... (more)

42
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1

## fstorage page info

I am attempting to integrate examples/peripheral/flash_fstorage into my project (SDK 14.1.0).

When calling nrf_fstorage_write I get NRF_ERROR_INVALID_LENGTH in response. I assume because I am only trying to write 20 bytes not ~2K. However, for some reason ... (more)

61
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1
vote
1

## Does ACL protect from CPU only or also peripherals on nRF52850?

Does the ACL peripheral protect flash from Read/Write/Erase of CPU and all peripherals? or just CPU? or do some peripherals have a privileged access? (such as the CryptoCell)

I'd like to use the CryptoCell 310 and keep ... (more)

187
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4
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## nRF52840 and the Root of Trust

Several answers from Nordic employees state the possibility of Secure Boot and a "Root of Trust" feature:

use of ARM TrustZone on nrf52840 for secure storage/trusted region

Cybersecurity features for NRF52 chips

What is the current progress for this ... (more)

55
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1

## How to use BLE of nRF52840-PDK and RIOT OS?

Hello,

I am currently working on nRF52840PDK baesd project, where I want to use BLE using RIOT OS. So, please can you provide any example for RIOT OS based BLE or any details/procedure?

Or how I can use softdevice ... (more)

26
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1

## advertising nrf52840 unlimitedly using ble_app_beacon

hi, i made my nrf 52840 dk advertise unlimitedly using ble_app_uart example. connected and disconnected several times using nrfconnect app. it really works fine. with this necessary changes.

i want to do ... (more)

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• Resolved questions: 10980
• Total questions: 27082

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