# 6,048 questions

Tagged
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976
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2
5

## When is crystal standby current drawn? Not when ON and all blocks idle?

Section 8.1.2 of the nRF51822 Product Specification states that the "Standby current for 16 MHz crystal oscillator" is 35 uA. The footnote says that the current is drawn "when there are no resources requesting the 16M, meaning there ... (more)

566
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no
2

## Wakeup device with app button

Hi,

is it possible to handle a 2 second button press and wake up the device with the app button modul? Or should i handle the button without the app button modul to wake up the device after a 2 ... (more)

594
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no
1

## Current consumption cpu

Hi, where can i find the cpu current ratings for the diffrent System modes.

best regards Nils

1k
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no
3

## nrf_delay is inaccurate

Hi,

i have a problem in my Code, when ic look nrf_delay_us (1000) on the oscilloscope i can se a puls withe 1,3 us thats not accurate enough. What could be a reason for that? What could i had ... (more)

844
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2
2

## nRF51 Peripheral Power Control

The nRF51_reference manual describes the POWER register for the RADIO. Also that when the Power is turned on the Registers are reset. Other peripherals e.g. ECB have POWER registers defined in their data structures in the header file "nRF51 ... (more)

13k
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1
vote
1

Hello!

I have a very simple setup with Arduino board (see attachment)

I wish to move to the nRF51822. I have the development kit and the nRF Go motherboard.

As I understood from the docs I should connect to P5 ... (more)

5k
views
1
vote
1

## How to reset the Device?

Hi,

is there any example how to reset the hole device? Are there any example codes for using something like system_off or system_on ?

Best regards Nils

909
views
1
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2

## How to use app_button and wake up?

Hi,

i need to start my application while pressing two seconds a button. For this i use an gpiote event like here --> https://devzone.nordicsemi.com/index..... But when i want to start my application i first have to push ... (more)

617
views
1
vote
1

## Service is advertised, but not provided.

Hi Nordic!

I am building a Bluetooth application that uses Alert and Notification Service. We are using Evaluation board PCA10001, our code is based on the example app from board 6310.

The Central role is on iOS app. I can ... (more)

1k
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no
1

## Cannot discover device using master control panel

I have a nRF51822 dev kit, and my dongle is running the master emulator firmware, and master control panel is running on my computer, the dongle is connected and started discovery mode without any problems

I have one of my ... (more)

1k
views
5
1

## LFCLK (32kHz) on a GPIO pin for precision measurement?

Dear Nordic Developer Zone,

Is there a way to set the LFCLK (32kHz) on a GPIO for precision measurement?

Best regards

2k
views
4
2

## nrf51822-ceaa package PCB questions

Hi,

I am currently designing a PCB to accept the BGA version of the nrf51822.

The Altium reference designs for the CEAA package (BGA) all include vias directly in the BGA pads, which is normally not suitable for reliable manufacture ... (more)

7k
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no
1

## How to get uart_example to work on NRF51822?

I am unable to see any uart print output when running the uart_example with NRF51822. I am able to see the program execute via the debugger, but have not seen any output. I have tried using it with and without ... (more)

970
views
1
vote
2

## RTC timer is shiffting after connection/disconnetion

Dear Nordic Devloper Zone,

I am facing a problem with RTC timer.

Here is a scenario :

I have an IOS application which is able to set the current time on the nRF51822.

In the nRF51822 application, I am using a ... (more)

359
views
no
1

## Migration to a module from the nRF51822 Evalutation Kit

I have a working design on the nRF51822 Evaluation Kit, and I now need to port that into a module that sits on a custom board. Any recommendations for making this process painless? Any module recommendations? Any pitfalls I should ... (more)

383
views
no
3

## how to FLASH upgrade FW in the nRF51822 though my application controller?

want to FLASH upgrade FW in the nRF51822 though my application controller. Is C or C++ code available for this operation or can you deliver a protocol description how to setup this ?

3k
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3

## Strange behaviour with nRF51822 and S110

Hello, I'm trying to develop with the nRF51822 Eval kit and GCC and Eclipse. I've been getting some strange behavior and errors lately. I'm not really sure how to describe it better, because I'm not sure ... (more)

1k
views
3
2

## How to run ble_app_hrs project?

Hello, I have major problem trying to debug/run ble_app_hrs example. The thing is that when I enter debug mode the code is stuck here:


0x000001B4 4908      LDR      r1,[pc,#32]  ; @0x000001D8
0x000001B6 68C9      LDR      r1,[r1,#0x0C]
0x000001B8 2900 ...
(more)

839
views
1
vote
1

## Silicon die temperature value interpretation

Dear Nordic Developer Zone,

I am able to ask a Silicon temperature measurement, but not to correctly interpret the answer.

After last measurement, I have got 0x29C. In your documentation, you specify that the value has 0.25°C precision ... (more)

1k
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2

## How do I use nRF51822DK?

How do I use nRF51822DK without "nRFgo Starter Kit Motherboard"? I have read "nRF51822 Development Kit User Guide v1.2" and have no result how can I only use nRF51822DK hardware and keil enviroment to work.

2k
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3

## How can I wake up BLE device from power system off mode without buttons

Dear all: recently, I follow heart rate profile to write custom BLE profile,but I also went to a number of issues. how to wake up the device when entered power system off mode via software . By the way . why ... (more)

665
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2

## sd_ppi_channel_xxx funtions

Hello,

I made a PWM with the TIMER2 of my nRF51822 (with the SoftDevice) and was working fine, till I read that I should not use the "NRF_PPI" functions and use the "sd_ppi_XXX". I change them in my code and ...
(more)

2k
views
no
4

## How to develop a GATT Client application?

I have a central device , that acting as a gatt server. the service is customize, and 128bit- primary serivice UUID ,its characteristics' UUIDs(128bit) are all known, how to discovery the service and characteristics in nrf51822 peripheral? I don't ... (more)

2k
views
4
2

## nRF51822 Average current consumption

Hi Where do I find a measurement report from Nordic which shows the average current consumption for a typical BLE application (1 seconds advertising period e.g.)?

Until now, I could not find any official AppNote or numbers even though ... (more)

1k
views
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2

## Eclipse compiling [closed]

Hi all,

I have followed the guide (AN-29) for using eclipse with the nRF51822 but it gives me several errors.

First at all, the linker says: ...../arm-none-eabi/bin/ld.exe: cannot find -lnosys. I found that this library was declared ... (more)

427
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1
vote
2

## iPhone demos: location of associated Keil project file(s)?

Hi,

Just bought the nRF51822 eval kit. Looks like it came with some great demos for iPhone (nRF_Demo_Utility, nRF_Proximity, nRF_Temp, nRF_UART), but having trouble getting these demos to work! Did Nordic provide associated Keil project files for these? I think ... (more)

1k
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2
3

## Specify Port for L2CAP Communication

Hi all,

I am trying to specify a fixed port for a L2CAP connection on the nRF51822. The client is a Linux box running bluez (which has BLE support). The client software is designed in Qt, which exposes the underlying ... (more)

906
views
1
vote
1

## Soft Device app_timer lib : what is the maximum number of timers

Dear Nordic support team,

What is the maximum number of timers that I can create (and use) using the app_timer lib?

    err_code = app_timer_create(&m_timer_m_1_0,
APP_TIMER_MODE_REPEATED,
timer_m_1_0_timeout_handler);


I have tried to initializate 10 timers this morning which are not all involved ... (more)

981
views
2
1

## Strange beahaviour with size of 'manufacturer data'

I was unaware that the 'manufacturer data' in the advertising packets is limited to less than a full payload. However, whenever I set it to >6 the program "crashes".


#define MANUFACTURER_DATA_LEN                7
...

adv_manuf_data_data ...
(more)

425
views
no
1

## App stop working after breakpoint for code analysis

Dear Nordic Developer Zone,

Since I have implemented a timer with interrupt in my application, the debug mode if the Keil IDE stops working when I try to restart the code execution after a breakpoint for code analysis.

I am ... (more)

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