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# 734 questions

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14
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## nRF51422 SDK11 app_uart_fifo race condition and fix

Yet another app_uart_fifo question. I'm using SDK 11 with uVision. It is my expectation that, if using HW flow control and a FIFO to RX, no received characters should be dropped at all, under any conditions.

I've noticed ... (more)

21
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1

## RF Status Running Gazell on nRF51422 s130

I need to use an external RF amplifier. This needs two control lines, one for TX and one for RX. I need some way to know when to change the state of the control lines. Is there some status word ... (more)

29
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## radio state RX

I need to us an external RF amplifier that requires TX and RX control lines. I'm looking for a way to tell when TX starts to kick the unit into TX mode. I also need to know when RX ... (more)

39
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1
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1

## GPIOTE event is not triggered sometimes

Hello,

I need two signals with a phase shift to control my motor. For some reason, completely randomly, sometimes my GPIOTE event is not triggered and i get the inversion of the signals. I am spinning the motor for approximately ... (more)

33
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## Unable to read characteristics complete value

Hi,

We are performing data transfer using NUS service (BLE-UART).

1. Data passed is a 11-character string.
2. READ and NOTIFY permissions are provided for Tx characteristic in NUS service.

The string is visible in nrf-Connect Android App's Log on enabling ... (more)

40
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## How to reinitialize advertising ?

Hello, I use nrf51822 , sdk 8.0.0, s110

I defined advertise interval and timeout

#define APP_ADV_INTERVAL                         320


Also, I write advertising init function at below;

static void advertising_init(void)
{

.
.
.

ble_adv_modes_config_t options = {0};
options ...
(more)

40
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1
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1

## NRF51422 SPI slave BLE send

Hello all,

So.... i'm quite green to the Nordic and Bluetooth protocol. i want to program NRF51422. what i have now it the Nordic test board and a spi-canbus print. this all is going to be a pcb for ... (more)

62
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3
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## Which is the best proprietary stack to pair multiple Devices (single FW) to a single Host and use several systems (e.g. Host_1 with Device_1 and Host_2 with Device_2) concurrently (one within the antenna range of the other) without interferences?

I'm developing a system which consists of 1 or more remotes (3 or 4 max) that have to communicate with a single host.

I need a fairly simple protocol, low power optimised especially from the Remote side. I already ... (more)

75
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1
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1

## Bootloader RAM Settings

We have shifted our development from nrf51422 QFAC (32kB RAM and 256 kB Flash) to nrf51822 QFAA (16kB RAM and 256 kB Flash).

I'm unable to run dual bank ble bootloader on the latter one, which I assume is ... (more)

100
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## Is there a Completed Code BLE Characteristics, from the beginner's tutorial ported for SDK version 12.3?

Hi,

I'm a beginner of BLE and I did everything from the three BLE tutorials, that uses sdk 11. However when I try to do it in sdk 12.3 it doesn't work, because there are some changes ... (more)

79
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1
vote
1

## Can I use app_timer and nrf_drv_timer together?

Hi,

I am having problems with using BLE along with gpiote and ppi for measuring the delay between two waveforms and sending the delay between them to an app using bluetooth. I am measuring the delay using the nrf timer ... (more)

154
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## Are there any Segger Embedded Studio examples for the nRF51 dev kit?

Are there any Segger Embedded Studio examples for the nRF51 dev kit? All the examples supplied with the nRF5_SDK_14.1.0 seem to be for the nRF52. I only bought a new dev kit this week and hoped it was ... (more)

30
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1
vote
1

## How to adapt code from device_manager.h to peer_manager.h?

Hello.

I am trying to migrate from sdk 11 to sdk 12 and I am having difficulty in adapting the device_manager.h functions that I am using in my code to the peer_manager.h functions.

What are the equivalences between ... (more)

261
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no
3

## Porting Fastled library to nRF51422

Hi all,

I am developing firmwares for the nRF51422 under Eclipse with the ARM GCC toolchain.

I have a matrix of WS2812 (or neopixel) RGB LEDs that I am controlling using the code available here.

However, I would like to ... (more)

29
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1
vote
1

## Need genral guidance on radio device

I need a cheap 2 or 3 button fob or itag to connect to/control my NRF51 firmware. So far I only could find "AB Shutter 3" as input device with >1 button but it is using Bluetooth V3. I ... (more)

125
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2

## Application compiles with no errors but still dosen't work?

I am building a Bluetooth Mesh application based on the Mesh Beacon Example, i have written a custom Makefile and got it compiling with no errors.

But when Flashing the nRF51422 with the program, nothing happens. If I build the ... (more)

47
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1
vote
1

## Compiling for nrF51422 and running on nRF51822

Hi all,

I installed Nordic examples for Keil MDK, and I am able to compile the examples for the PCA10028 board, which is based on the nRF51422. But I intend to take the same code, and run it on a ... (more)

44
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1
vote
1

## How to configure NRF51-DK to flash firmware to a different nrf51 module

Hi all, I have here NRF51-DK, I am a bit familiar with the kit for a while. Now I want to make a system using NRF518422 chip. I manage to find a module - "Taiyo Yuden EYAGJNZXX".

My question is, Is ... (more)

86
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## ble communication in a separate C file

I would like to separate the BLE communication from the main.c and place it to a separate file. I followed the example of the default ble_app_template as well as nordic's services tutorial to create the BLE. It is ... (more)

59
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no
1

## Low voltage detector on "ble_app_blinky" peripheral

Hello we have a projekt with periperal "ble-app-blinky" und central "ble_app_blinky_c".

how to do:
when the "peripheral" battery is below 2.3V then the led 4 on "central" must going on?

(In the moment we do it with a external ... (more)

57
views
1
vote
1

## New to NRF51422

I am developing a product where I need to read a signal from an SPI ADC and send remotely to a receiver. This will be powered of a coin cell. I see that the NRF51422 is low power, but I ... (more)

32
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1

## How App switch to bootloader_secure

Hi, I am use nRF51422 and SDK 12.3 sd130. I can use nRFTool App update FW to nRF51422. but I dont know how to switch App to bootloader in BLE not button. which function I can use and reset ... (more)

80
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no
2

## Error: app.hex in softdevice region

Hello everyone,

I'm currently migrating from a functional code IAR to Eclipse GCC.

It compiles fine and I got the hex files.

However I have some troube to flash the application in the module. Indeed, when I'm using ... (more)

148
views
1
vote
2

## Hard Fault when using bluetooth mesh examples

When programming the bluetooth mesh light control demo example found in the bluetooth mesh SDK, i get this error using J-Link RTT Viewer:

0> <t:          0>, main.c,  116, ----- BLE Mesh Light Control Server Demo -----
0> <t:       1391>, main.c ...
(more)

35
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## RTT infinite loop over initial commands

Hi,

I have just updated the SEGGER Jlink tools to the latest version v6.18b.

Under Keil debbuging the J-Link RTT Viewer (or client) shows the initialization commands in an infinite loop (one after the other starting from the first ... (more)

39
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no
1

## Disable enhanced power control

Hello,

Is there any way to disable the "Enhanced Power Control" feature of the BLE standard? I am working with nRF51-DK in the connection mode and I need fixed transmit power regardless of the distance between my Bluetooth devices. If ... (more)

496
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2
2

## nRF51 DK soft devices examples not working

Hi,

I have an nRF51 DK, found here https://www.nordicsemi.com/eng/Produc.... I am using SDK V11.0 and S130 V2.0. I am developing on a Linux machine.

I can compile and run the blinky example successfully ... (more)

159
views
5
1

## Mesh SDK 0.9.1 on PCA10028 - Light Control Demo - Hard Fault

Post in reference to link

After flashing light control server or client app on PCA10028 app crashes with HARD FAULT.

Steps how I built the app:

ble_mesh_v0.9.1-Alpha>mkdir build
ble_mesh_v0 ...
(more)

115
views
2
1

## where can i find nRF51422-QFAA-T PDF DATASHEET

1. i doing the pcb tiring to find the package size .

2. also if there is any application note to the pcb Antena

332
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no
2

## PCB antenna design problem: too short range?

Dear Nordic,

Some time ago we started a project in which we decided to use ANT protocol to communicate wirelessly. However, now that we are going to production in a very very short time, we have spotted a very critical ... (more)

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