# 16,082 questions

210
views
no
3

## nRF52 edit nfc tag

Hello,

I have a question about the NFC tag. In the example nrf_url_record_pca10040 there is a part where the url will be written in the tag

err_code = nfc_uri_msg_encode( NFC_URI_HTTP_WWW, (uint8_t *) url, sizeof(url), ndef_msg_buf, &len);

However when I try to ... (more)

no
views
no
no

## nRF52: Setting LFCLKSRC to use external crystal oscillator?

I'm slightly bamboozled by the LFCLKCSRC options in the NRF52 datasheet / product specification.

Bit field SRC makes sense. Set to 0 for the internal RC oscillator, 1 for the xtal, and 2 to drive it from the HFCLK.

Bit ... (more)

1
view
no
no

## TWI causing nRF52 not to sleep

I am using sd_app_evt_wait() to put my nRF52 to sleep. Works fine except after I read from a TWI sensor. As soon as I do I see the nRF52 continuously jump out of sleep. I have put a log into ... (more)

6
views
no
no

## code modification from nrf51422 to nrf51822

Dear Nordic Team,

Thanks for support.

We have nrf51422 development kit and trained in this sample code. How to use the same example code for nrf51822. please support for this modification

16
views
no
no

## Handle Value Notification variable conn.interval

I am using a nRF51822 to send data to an iOS device. Because latency is critical to my application, i 've set up a test program that sends a packet every second , using notifications.

Sniffing the BLE traffic with nRF ... (more)

3
views
no
no

## UART Init without FIFO:

I am using 3 uarts for my applications using nrf52xx, i want uart without fifo,i configure 3 uarts independently and use the

#define APP_UART_INIT(
P_COMM_PARAMS,
EVT_HANDLER,
IRQ_PRIO,
ERR_CODE
)


for initialising my uarts.but this functions return a error as ... (more)

9
views
no
1

## Error Trying to program nRF51822

Hello,

I have been looking to program this IC, connecting via SWD with no luck. I can connect to the target but for some reason once i try to perform erase programming or read i got an error message with ... (more)

5
views
no
1

## RAM check failed Nordic nrf51822 [closed]

Hello,

I have been looking to program this IC, connecting via SWD with no luck. I can connect to the target but for some reason once i try to perform erase programming or read i got an error message with ... (more)

83
views
2
2

## fds: pages_init() will not initialize all entries of m_pages[]?

For example, if the first page is erased then it will set this page as swap page and continue looping without increasing the 'page' variable.

• This means that the last entry of m_pages is left uninitialized.
• Uninitialized in this case ...
(more)

12
views
no
1

## TWI timeout - SDK11

Hi,

I'm using the nrf_drv_twi driver (master) to communicate with a number of IO components, such as LEDs, buttons etc.

If my IO component does not respond (why is not relevant to this question, but it does...), the code ... (more)

4
views
no
1

Hi

Is there any limitation to characteristic size for use in notifications? The reason for asking is the following: I have a service with a characteristic with size 24 bytes. When doing a normal read of that characteristic, I get ... (more)

14
views
no
1

## SPI doesn't work with bootloader

Hi,

I'm creating a simple SPI bootloader without SD for nRF51822 based on this post

The bootloader is connected to Freescale 22F through SPI and it will be without any BLE. The application itself is simple, which is only ... (more)

22
views
no
no

## nRF51 BLE examples on mbed.org will not compile

I'm trying to get going on an nRF51 project using the compiler on mbed.org, but if I create a new project using the nRF51 DK and use any of the example BLE apps as templates I get multiple ... (more)

8
views
no
no

## Different DC/DC converter capacitor value on nRF52832?

Hi,

Is it possible to use a different capacitor value, say 4.7uF instead of 1.0uF, in the DC/DC converter circuit on the nRF52832?

Kind regards,

Thiemo

128
views
no
2

## MQTT Example - Settings for publishing while subscribing?

Hi, I use the following.

• Raspberry Pi 3 (RPi3 with Raspbian Jessie 4.4) as a router,

RPi3 is connected to a Wi-Fi router to access the Internet by using the built-in Wi-Fi BLE BCM43438 chip.

• IoT SDK 0.9 ...

(more)

51
views
1
vote
1

## Fees for BLE and NRF license

I have designed new device based on nrf51822 chip. New PCB with your chip and other elements. I with my team want to sell the standalone device with update possibility by the bootloader. This device will collect data from environment ... (more)

21
views
1
vote
1

## cannot find entry symbol reset_handler

Hi all , I used SEGGER Embedded Studio v3.10 , and import a ble_app_uart keil project , but now build warnning as follow:

create .elf file have a warning "cannot find entry symbol reset_handler;defaulting to 0x0001c000" I added nRF_Startup.s this ... (more)

15
views
no
1

## ble_app_uart with RTT won't load

Hello, I followed this tutorial:

https://devzone.nordicsemi.com/tutori...

and added the RTT files to the project, however, after I compile i get this message :

and when i open J-link RTT viewer and try to load the compiled project ... (more)

28
views
no
1

## Can nrf52832 communicate with nrf51822 in gzl protocol

I want nrf52832(as host) communicate with nrf51822(as device) in gzl protocol(SDK11), Is it possible?

39
views
no
1

## Fstorage/FDS Issue With SoftDevice

Hi All,

I am trying to implement fstorage (the issue also happens if you try FDS). I'm using gcc and when I modify the makefile to compile fstorage it requests a file called, "section_vars.h" which is in a ... (more)

26
views
no
1

## static passkey demo code for S110 stackV8.0/SDK10 of nrf51822

Dear all

I want to add the static pin to my project(s110 stackV8.0, based on SDK10), add the follow code to gap_params_init:

uint8_t passkey[] = STATIC_PASSKEY;
m_static_pin_option.gap_opt.passkey.p_passkey = passkey;
err_code =  sd_ble_opt_set(BLE_GAP_OPT_PASSKEY, &m_static_pin_option);


init the device manager ... (more)

22
views
2
no

## Double direction communication problem in ESB protocol (PTX --> PRX --> PTX)

Hey,

I have two nrf52 development board. One is PRX, one is PTX. I try to realize the scenario that: PTX transmits a number like "100", PRX receives this data "100" and plus "1". Now data is "101" at the ... (more)

33
views
1
vote
2

## Problem with RFX2411N

Hi all, i'm doing some beaconing experiments with my NRF51-DK, a RFX2411N-EVB and a HG2408U antenna. I'm using S110 with beaconing demo code, and nRF Connect app to measure signal strength. With the DK+external antenna (no RFX2411N-EVB ... (more)

5
views
no
no

## segger jlink cortex m4f floating point debugging

Hello.

I would like to develop FW for the nRF52832, using Eclipse IDE + ARM GCC + Segger JLink OB.

I've seen on the segger webpage that the nRF52832 is a Cortex M4 processor, while in fact it is declared on ... (more)

31
views
1
vote
1

## device nRf51 - after OTA dfu, mobile not able to detect the device ..

Hello all I am new Nordic and Bluetooth, before starting my project I did small experiment to understand the system i did the following steps.

1) Used nRF51822 -32 KB Ram AC version with preloaded bootloader supplied with the SDK ... (more)

78
views
no
1

## Is it possible to decrease the SoftDevice start time?

Hello,

I'm currently working on profiling an embedded application on an nRF52 using the S132 SoftDevice.

I've found that the svcall sd_softdevice_enable takes approximately 250ms to return control to the calling thread.

This increases our startup latency to ... (more)

8
views
no
no

## How and where to send a SERVICE CHANGED indicate?

I want to send a service changed indicate after upgrading app by dfu.I know dfu already so that,but i don't know that how dfu do that.

there is service_change_indicate function in dfu,but it seems not be ... (more)

14
views
no
no

## nRF52832DK bluetooth antenna radiation pattern

Hi,

May I please know the approximate radiation pattern for the antenna used in nRF52832DK?

41
views
no
1

## How do I set flash_placement.xml for nRF52 bootloader in SES?

I've seen several similar questions -- none of which were concerned with the bootloader project.

I believe the linker is looking for sections called .noinit and .bootloaderSettings. I think these need to be specified in flash_placement.xml in order to ... (more)

30
views
no
1

## fstorage module in nrf51

Hi,

Can anyone tell me about fstorage module and can I use this storage space to store password? Will it give me any extra level of security? If so how to implement and Is there any example that use the fstorage?

#### Statistics

• Total users: 13334
• Latest user: Hilda Forrester
• Resolved questions: 6995
• Total questions: 16082

## Recent blog posts

Posted 2016-08-19 12:10:29 by kendwyer
• ### What would you do if you got an Arduino Primo?

Posted 2016-08-16 12:19:49 by Pär H

Posted 2016-08-12 12:59:30 by Jan Tore Guggedal
• ### nRF52832 and Android Nougat – simple and secure touch-to-pair.

Posted 2016-08-24 11:00:26 by Pär H
• ### Show And Tell: Lys - An Automation Example

Posted 2016-08-01 18:47:39 by Daniel Veilleux

## Recent questions

• ### nRF52: Setting LFCLKSRC to use external crystal oscillator?

Posted 2016-08-29 19:46:48 by CurtisHx
• ### TWI causing nRF52 not to sleep

Posted 2016-08-29 19:43:09 by RichieJH
• ### code modification from nrf51422 to nrf51822

Posted 2016-08-29 17:45:56 by Murugan
• ### RAM check failed Nordic nrf51822

Posted 2016-08-29 17:07:16 by Jorge Munoz
• ### Error Trying to program nRF51822

Posted 2016-08-29 17:05:10 by Jorge Munoz