# 20,786 questions

401
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1
vote
2

## CTRL-R is not working

When I start the nRF51822 sniffer ble-sniffer_win_1.0.1_1111_Sniffer.exe I get the following message:

When I press control-r I get the following message:

Programming... Keyboard input error: [Error 2] The system ... (more)

24
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no
1

## How long to keep FDS file open and fds_record_desc_t

In our code we use NV storage for system settings and calibration data.

I'm trying to understand when to open/close files and which structs to keep bwtween reads/writes. I've looked at the GIT example code, but ... (more)

695
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1
vote
2

## Problem using UART and radio in ESB mode on nRF24LE01.

Hi

for few days I seem to got stack in using together UART and radio on nRF21LE01 in ESB mode and I suspect irq_flags = hal_nrf_get_clear_irq_flags(); to be cause of my problem.

What I want to achieve is to communicate to ... (more)

120
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no
no

## How to read and write to registers of MMA7660 using TWI

Hi, i am working on TWI sensor example in SDK1. in which i connected SCL And SDA pins tonRF52 dk boards sca and scl pins. and connected voltage and ground. when i run the application on board i am getting ...

(more)

70
views
1
vote
3

## nRF51822 external capacitor between AVDD(35/36pin) and VSS(33/34)

Hello,

I have a question regarding AVDD(35/36) pin. I am using nRF51822 QFAA package. And the reference circuitry on the datasheet uses a 1.0nF capacitor between AVDD and GND.

We have the following questiongs: When I put ... (more)

16
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1
vote
no

## nrf51 does not respond to bluetooth message

I am using nrf51 running as a peripheral and an iphone app as central. It works OK when I first use the iphone app to connect to nrf51. Then I quit the iphone app and let the nrf51 run in ... (more)

24
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no
2

## sdk13 buttonless dfu can't start bootloader [closed]

hi,dear engineers,

i use the example experimental_ble_app_buttonless_dfu of nRF5_SDK_13.0.0_04a0bfd, on the PCA10040 board,Now,i'm sure that I am flashed Softdevice,app,and bootloader,and the board work in the app.and well,the nRF connect ... (more)

32
views
1
vote
1

## Programming nRF52 chip using 2 UART pins

hi

I have designed a small PCB with the NRF52 chip on it and kept few ports for some peripherals. Apart from that I only have 4 pins that I can connect to, UART-Tx, UART-Rx, Power and Gnd. I want ... (more)

72
views
no
1

I use radio test example in SDK 12.2.0.

Is it possible to perform modulation with PRBS9?

61
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no
1

in nRF24L01

23
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no
no

## HTU21D no response over I2C

Hi,

I am using the example code supplied by the blog for reading humidity from the HTU21D sensor using TWI. My humidity and temperature readings are constant and never change. They appear as:

Humidity: -6.0 Temperature: -46.85

Based ... (more)

37
views
2
no

## gcc/cmake with Nordic SDK?

I have everything working nicely with gcc, my own Makefiles, and the Nordic SDK12.2. I'd like to move to CMake to better automate my process (in particular, compiling one codebase for multiple boards).

The trouble is that the ... (more)

14
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no
no

## NRF HRS peripheral to NRF HRS central

I am trying to get a NRF HRS central (ble_app_hrs_c) to make a connection to a NRF HRS peripheral (ble_app_hrs). However, the peripheral does not show up whenever the central scans for HRS device(s). Meanwhile, the HRS peripheral appears ... (more)

32
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no

## Timer Drift Clarification

Working with nRF52832 and SD132-v2.0.1

Using external 32.768kHz xtal in addition to 32MHz xtal.

I realize there are a lot of posts about timers, but I didn't find any posts that answered my question(s).

I ... (more)

23
views
1
vote
1

## DK: use internal device with external device connected

Hello,

Can I interact with the internal device of the nRF52 DK (PCA10040) while an other nRF52 connected through the P20 (or P19) connector? The JLink tool has a "device" command but I don't known if it can be ... (more)

74
views
3
2

## micro ecc create wrong publickey in windows

My pc server should send information to nrf52832 by ECDH, then I create a dll file from micro-ecc. However,the result in windows is not the same as the result in nrf52832. The following is some test code in VS2013 ... (more)

52
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1

## nrf to slave device

Sir, I have interfaced nrf board(Master) with msp430(slave) device through spi communication. And Everytime when i am debugging, i got different data(ie,. data which was sent from nrf is shifted by one bit in msp rx_buffer). And ... (more)

40
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1

## about detailed description for 9 states of peripheral connection event

dear friends , within a peripheral connection event, 9 states is identified, as it is shown in the pic above(from s132 document). Can i get a detailed description about what work is done during each state ? for example,a detailed ... (more)

24
views
2
1

## Reconnect Problem IoT lwIP

Hi @ all,

I am working with IoT SDK 0.9 and nRF52DK.

I have trouble with the lwIP CoAP client example. Everything works so far, the board is connected and I'm able to ping it via Raspberry Pi from ... (more)

20
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no
no

## Slave latency & communication speed Nordic's trick?

Hello, I use nRF51822 based device with s110 softdevice. I noticed that data exchange is different on different connected centrals. For test I used Windows and Android powered central. The task is to send request and receive responce in notification ... (more)

34
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no
1

## How to read data sent from ble_app_hrs to ble_app_uart_c on PC serial monitor?

Hello!

Is it possible to read data sent from ble_app_hrs(peripheral ) to ble_app_uart_c(Central) on PC's serial monitor? If possible, how can i achieve this and which part of code do i need to make change?

Thanks for help!

37
views
no
1

## problem with bond and pstorage............?

hai, i am using mbed to program my nrf51822.

i need the following requirements

1.store some data on nrf51822 flash memory using pstorage.

2.setup bonding for security using securitymanager.

now i am able to do both these separately ... (more)

26
views
no
1

## nrf_serial vs. app_uart [closed]

I'm migrating to the new 13.0.0 SDK and I'm wondering what are the benefits of using nrf_serial over app_uart (if any) and what steps I would need to take to switch over if I choose to.

452
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3
3

## Programming SoftDevice to custom PCB: Unable to find or open the JLinkARM dll

I've been trying to program a custom PCB with an nRF52832, using the nRF52 Development Kit and nRFgo Studio.

When I connect just the nRF52 Development Kit to my computer and program the SoftDevice (s132_nrf52_3.0.0_softdevice.hex), it ... (more)

28
views
no
1

## Precompiled 6LowPan (IPv6) to BLE Example

Hello,

I'm following the steps listed in the nRF5_IoT_SDK documentation and would like to connect the nRF52 to my Raspberry Pi 3 router. I have the RPi3 enabled for 6LowPan. Now, I need to get code running on the ... (more)

50
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no
no

## Keil + nrfjprog = true ( PCA10040) problems

I have done erase all thing.

But in the second step, I am getting following error.

nrfjprog --program s132_nrf52_3.0.0_softdevice.hex ERROR: The --family option given with the command (or the default from ERROR: nrfjprog.ini) does not match ... (more)

46
views
no
1

## Detect Nordic board type at runtime

Hi

I'd like to create a firmware that supports multiple Nordic boards as Hardware (as the nRFConnect Firmware does). To do that I have to configure the peripherals according to the layout of these boards.

How can the firmware ... (more)

23
views
no
1

Hi all. I have phone with nrf Tollbox and central device with DFU, SD130 2.0.0, SDK11. I would like flash application to central by OTA when I enter password in nrfToolbox. My central device doesn't have keyboard ... (more)

66
views
no
1

## WFE loop problem

Hi, I have exactly the same problem as in question https://devzone.nordicsemi.com/questi... but I can't find the solution. When I erase all from memory, debugging works. If I flash softdevice by nRF Studio It will not ... (more)

64
views
1
vote
3

## Frequency hopping with S132 v3

Hello! I'd like to know if S132 v3 implements the frequency hopping scheme defined by BLE.

I've read some documentation on Gazell, but from what I understood, that is a completely different protocol, not a superset of BLE ... (more)

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• Latest user: Jaxon Clement
• Resolved questions: 8868
• Total questions: 20786

## Recent blog posts

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## Recent questions

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• ### multiple definition of `SPI1_TWI1_IRQHandler'

Posted 2017-03-24 10:03:43 by ashare
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