# 22,463 questions

139
views
11
2

## Nordic Tech Tour target audience?

I'm an intern in my second year for a bachelor in computer engineering. I've been working with the nRF52832 development kit as part of my assignment. I was looking through Nordic's events when the tech tour caught ... (more)

47
views
no
2

## I've connected nRF52 board to custom nRF52 board with serial communication chip. How to setup serial communication now?

What changes are to be made in example dtm code so that I set up a serial communication link.

25
views
no
no

## nrfprog returns wrong family error when programming nrf52840 on a custom board [closed]

Hello, I get the

"ERROR: The --family option given with the command (or the default from nrfjprog. ini)

ERROR: does not match the device connected."

message after entering pretty much any command, erase, program etc., for example, this one:

nrfjprog ... (more)

36
views
no
2

## nRF52840 USB MSD Slow Write Speed

Hi, I have recently acquire a nRF52840 preview development board to prototype a USB MSD. With the example provided in the SDK V13, I tested the write speed and it was far from usable.

I am not sure if it ... (more)

12
views
no
no

## Store data in flash with NRF52832 and MBED and GCC

Hi,

I'm trying to use an existing NRF51822 mbed codebase on a new NRF52832 product and am having some issues.

First of all, it seems that I can't use mbedlib, but need to update to mbed-os because BLE ... (more)

47
views
no
1

## Why can't I keep using S110/120 devices on nrf52840?

It appears that I must use S134 and S140 etc. Is it backward compatible? By that I mean I keep using S110/120 at the cost of not being able to utilize some of the latest feature?

34
views
no
no

## what is result err code 3 in app_twi_callback_t

I am getting result code 3 after app_twi_schedule in the call back. What does that mean? Thanks Paul

42
views
no
2

## After DFU Application at DFU_BANK_0_REGION_START is not valid [closed]

Hi,

I have a device with nRF52832 and firmware is composed of Bootloader (BL), softdevice (SD) S132 v2.0.0, application and I am using SDK 11.0.

I have created different firmware updates (BL, SD, App, BL+SD, etc ... (more)

24
views
no
no

## ble_app_uart packet not sent more than 278 packets [closed]

I am testing ble_app_uart. Softdevice is S130 and SDK is nRF5_SDK_12.2.0_f012efa.

My development board is Waveshare's NRF51822 Eval Kit.

When I test the ble_app_uart firmware, I cannot send more than 278 packets to ... (more)

19
views
no
no

## DFU Security. I do not know the BLE Event

Hi;

I do not know the BLE Event(DFU bootLoader/SDK Sample) so I will ask you a question.

The environment using is below.

SDK v10.0.0 (Sample code/dfu_transport_ble.c)

SoftDevice S110&S120(v8.0.0?&v2.1 ... (more)

47
views
no
1

## Building sdk12 examples

Hi

So far I have been using the examples from Keil 5 pack installer. Now I tried loading some from the SDK example folder and I have issues with includes. What do I need to adjust to have those includes ... (more)

36
views
9
1

## Unable to Send Messages NRF52 BLE Central Custom Device

Currently I am using the NRF52 device to connect with a custom peripheral. The current goal I am trying to reach is toggling an LED by sending the command 0x8900 through Service UUID 0x0001 with Characterisic ID 0x0002.
This is ...
(more)

182
views
4
2

## Restartig app_timer does not work with nRF52832 and SDK12.0.0

I am having an app_timer (nRF52832 / SDK12.0.0) that's interval must be changed during its lifetime. I am using following code to change the interval:

app_timer_stop(m_timer_id);
uint32_t interval = APP_TIMER_TICKS(interval_ms, APP_TIMER_PRESCALER);
app_timer_start(m_timer_id, interval, NULL);


So far ... (more)

38
views
-1
no

## How to prgram nRF beacon kit as peripheral with KEIL and nRF DK52. I cannot see the beacon kit to be programmed. KEIL says DLL error

How to prgram nRF beacon kit as peripheral with KEIL and nRF DK52. I cannot see the beacon kit to be programmed. KEIL says DLL error. Please let me know thw KEIL settings to see the beacon as a device

43
views
no
1

## Where can I get example for transfer data(file) (nRF52840) [closed]

I have 2 board nrf52840 DK, I now I want to send file ( 1~2 Mbyte) from board_1 to board_2 without use UART. where can I get example to do that ? PS: I also need example with different kit or ... (more)

27
views
no
no

## nRF5 SDK 12.3.0 Eddystone on nRF51822 beacon

Hi,

I've seen that SDK 12.3.0 contains a new version of the application sample using the Eddystone protocol for BLE. I would like to know if this version is compatible with nRF51 chips as it was said ... (more)

25
views
no
no

## command line nrfutil dfu ble

I am attempting to do a BLE firmware update via command line tools in an attempt to automate programming in a script file. I have zero problems performing an over the air dfu when using nRF Connect, but I can ... (more)

37
views
1
vote
1

## nrf52 reboot and VDD overvoltage

Hi,

I am trying to figure out the reboot reason on an NRF52 in order to solve it in the best way.

We have a design with a dual supply 3.6V/5V going through a 3V LDO. Problem is ... (more)

56
views
2
1

## Interrupt Vectors REMAP

How can I relocate or manage the transition between the bootloaders interrupt vector map and the applications interrupt vector map which will be at different addresses in FLASH. On the M3/M4, you can remap this but presumably on the ... (more)

43
views
2
1

## Reduce connection establish time

Hello,

i have a BLE Peripheral that has a service that we use to simulate UART over BLE. Very similar to the nRF UART. I consider the time to establish a link that allows to send asynchronous data to be ... (more)

66
views
1
vote
1

## Can I get two NFC 13.56MHz antennas from Nordic?

I have four of the nrf52 DK's. I lost two of the NFC 13.56MHz antennas.

Can I get/buy two from Nordic?

Richard Ferraro

287
views
no
3

## AES CCM encryption/decryption examples

Hello,

Are there examples of AES CCM encryption/decription?

Is there a recommended procedure for generating nounces?

Are there recommended procedures for using CCM?

Thank you.

Update: I forgot to mention I am using a nrf52832.

30
views
no
1

## AirFuel SDK 2.2.0 IROM and IRAM settings

I download "nRF5_AirFuel_SDK_2.2.0_7b89a57" and use "ptu_app_beacon" development, I am currently using "nrf51822-QFAA" and "nrf51822-QFAC", how do I set up IROM and IRAM?

155
views
5
1

## nrf52840 802.15.4 start command

Hi,

I'm trying to use the command "mlme_start_req" to setup the device as a pan coordinator to send beacons to the others devices in the network, but after submit the command the callback is not called. For instance, if ... (more)

40
views
2
1

## Connecting Jlink EDU-SWD mode to Nrf52832

wqewqeqwe.PNGI want to program the nrf52 chip using J link Edu -SWD mode. I actually connected the SWDCLK, SDI, and Vtref and GND of Jlink EDU programer to SWDCLK,SDI,3.3V& GND of nrf52 in my Self ... (more)

41
views
no
1

## CCM module resets the mcu

I have written a simple implementation for using the ccm module with mesh. It encrypts and decrypts as it should but when enabled the processor makes a soft reset. It happens quiet often but not on every sent or received ... (more)

56
views
no
1

## Capacitance reading circuit for nRF51

Currently, we are trying to have the nRF51 chip working with a type of capacitive pressure sensor. We did quite a lot of work on searching proper circuits of reading the capacitance of the sensor, including capacitance voltage divider, charging ... (more)

102
views
3
no

## 32-bit overflow in nrf_drv_wdt_init()

In nRF5 SDK 12.1.0 a bug was fixed in nrf_drv_wdt_init(). Watchdog timeout could not be larger than 131 seconds because of (x * 32768) multiplication before. This bug is again present in SDK 12.2.0, 12.3.0 ... (more)

16
views
no
1

## Send and receive interrupt lines from nBLE51822 to any MCU

I have not gone into much details of 51822. while interfacing BLE to any MCU, Is it possible to add interrupt lines from BLE module to MCU to receive interrupts in MCU. Like, if we added one RX INTR line ... (more)

64
views
no
1

## Timer not going off for 7-50 seconds

Hi,

We're working on the connection params negotiation. Therefore we need a timer to go off 2 seconds after connecting to send a conn params change request.

Most of the time this works as expected. We toggle some pins ... (more)

#### Statistics

• Total users: 20387
• Latest user: Debdasora
• Resolved questions: 9454
• Total questions: 22463

## Recent blog posts

• ### The complete tutorial for developing and debugging nRF52 applications on a Mac

Posted 2017-05-11 04:13:06 by Mohammad Afaneh
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• ### Setting up Segger on a mac or pc and debug - step by step for humans

Posted 2017-05-05 14:03:35 by Lola

Posted 2017-04-11 11:49:17 by Radosław Koppel
• ### Taking a deeper dive into Bluetooth 5

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## Recent questions

• ### BLE GATT_INTERNAL_ERROR 129

Posted 2017-05-30 14:53:16 by Mrunali
• ### Data storing in flash based on timer.

Posted 2017-05-30 13:54:41 by Prashant Singh
• ### Testing coded PHY with UART?

Posted 2017-05-30 13:45:39 by slowhand