# 891 questions

Tagged
• x
34
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1
vote
2

## What is the precision on timers?

We have built and run the code in examples->peripherals->timer in nRF5_SDK_12.3.0_d7731ad on 4 different Nordic DK nRF51 development boards. The timer period is 5 msec. We commented out the LED initialization and toggling. In the ISR ... (more)

14
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no
no

## 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)

30
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3
1

## current peak on the nrf51822

Hi,

I wanted to know the peak current of the nRF51822 chip using the softdevice 130.

I was looking through the documentation and found on the S130_SDS_v2.0.pdf the information on page 81 that the peak current should be ... (more)

52
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2
1

## BLE MESH and Proximity Monitor

Imagine I have developed a MESH made up of 50 Relay Nodes and I say only Relay Nodes because any of them must be able to relay and also able to initiate a message. In my application environment I need ... (more)

32
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## Wireshark failed to get capture packet with nRF-sniffer_2.0.0-beta

Hi,

I'm using the last sniffer package named nRF-sniffer_2.0.0-beta-1_51296aa with a nRF51 Dongle ([https://www.nordicsemi.com/eng/Produc...]). My PC is running Ubuntu 12.04 with Wireshark 2.4.3. I saw the nRF Sniffer in ... (more)

25
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1
vote
1

## Programming a chip externally using nRF51-DK

Is it possible to program the Atmel SAM D20E chip (based on an ARM-M0 cortex processor) externally using the P19 debug out header on the nRF51-DK?

Thanks.

341
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19
2

## Why isn't the nRF51 SDK on git?

While it's easy enough to download the SDK from Nordic's website, it's a slow and painful process.

It's slow I assume because the site is hosted far away from me. Loading all the pages to get ... (more)

24
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no
1

## Get insufficient authentication error to change Client characteristic Configuration

Hi: i write very simple BLE App, it used open link. No security/encrypt. 1 service with 2 characteristics. tx(serviceTXID, rxBuffer, 0, sizeof(rxBuffer), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE ), rx(serviceRXID, txBuffer, 0, sizeof(txBuffer), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY )

when up, use nRF Connect ... (more)

26
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no

## Wireshark can't show me the Interface toolbars [closed]

Hi there, I try to using nrf sniffer for trouble shooting, and follow the "nrf sniffer user's guide v2.0" , when I copy the unzip extcap's content to the Wireshar's Extcap directory(get from Wireshar's help ... (more)

81
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2
1

## Nordic intend to use Cortex-M23 and Cortex-M33?

I just bought a nrf51 dk to master this wonderful SoC series.

For now I intend to keep my research and studies with Bluetooth 4.1, but would like to prepare for a jump to the next version. And the ... (more)

23
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no
1

## Pulsewidth modulation with app_pwm results in NRF_ERROR_INVALID_STATE

I have a nrf51-DK. I am trying to get a PWM signal on one pin. Here is my code:

static volatile bool ready_flag;

void test_pwm(){
APP_PWM_INSTANCE(PWM1,2);                   // Create the instance ...
(more)

48
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no
1

## MIN MAX connect interval

i use BLE uart project SDK 11 NRF 51822 with 2 value min max conn interval default is 20 and 75 ms.

i use android App was built by my team, and it' hard connect to NRF. sometime miss, sometime ... (more)

302
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1

## BLE: Why i don't see my nrf51 with iphone?

I can see and bond nrf51 with android, but with iPhone nothing. What can i implement for see nrf51 with iPhone? Can i pair Iphone and nrf51? Sorry for the very bad english but I'm Italian. Thanks for further reply.

35
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## NRF51822 UART hangs and requires power cycle

Hi,

I am making a GPS tracking system using NRF51822-QFAC. I am using 2 UARTs, one of the (external) GPRS IC and one for (external) RS485 communication.

The UART peripheral hangs after some time. I don't know if it ... (more)

69
views
3
2

## add characteristics with distinct uuids (128-bit)

Hi,

I have created a custom service, and now I want to add different characteristics to it but with completely different uuids, not only the 12-13 octets.

This service will have 23 characteristics with completely different UUIDS. I tried to ... (more)

63
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no
1

## Connection after disconnect

Hello. I created some HID device based ble_app_hrs_pairing_nfc example on NRF52. And I have a questions:

1.I need to automatically reconnect to bonded device after reboot, but I don't need to start advertising again if I have bonded ... (more)

38
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1
vote
1

## NRF51-Dongle for sniffing nrf52xx

Hello, i wanted to ask if NRF51 Dongle NRF51-Dongle is capable of sniffing packets from NRF52xx parts? If yes, what are the limitations, because i think that nrf52xx parts are bluetooth 5, correct me if i am wrong, and nr51 ... (more)

42
views
1
vote
1

Hi,

I am using the nRF51 Dongle (PCA10031, V 1.1.0) and pc_ble_driver.py to create a custom script for testing purposes. But there seems to be a maximum limit for the measured RSSI? Is this correct, or is ... (more)

857
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no
2

## nRF51 DK mbed I2C/TWI

Hi,

I'm currently building a BLE multi-sensors device, with mbed online IDE. I succeed in implementing BLE API, and releasing a first .hex firmware with multiple services and characteristics.

Now, I want to replace my fake characteristic values by ... (more)

97
views
1
vote
1

## PCB antenna and J1 connector

Hi all,

I'm trying to measure the transmit power of nRF51 development kit with a spectrum analyzer and I am facing the following issue:

It is specified in the user guide of nRF51 that "When connecting the test probe ... (more)

22
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no
no

## I am having a problem on the second connect after bonding to a bluez 5.43 central

I can connect/pair/bond to the nrfConnect app and disconnect then reconnect just fine. When I try to do the same to a central running on arm bluez 5.43, the second and subsequent connections timeout after about 30 ... (more)

50
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3
2

## Using BLE to automate gate opener

Our homeowners association has a gate which opens when a transmitter in the car is pushed. I would like to add a BLE device to the gate which would trigger the gate to open when it detects a vehicle it ... (more)

62
views
1
vote
1

## Is there any example of using nRF51 UART for iOS similar to for android?

I am developing a solution that needs to use nRF51 UART to send streaming data and I found a great example for android at GitHub, however the application is multiplatform and I need an example of how to do in ... (more)

33
views
1
vote
1

## Transmitting 16 bit at once over SPI on nRF51-DK

Forgive me if this is a stupid question, but I am new to programming microcontrollers other than Arduino and SPI in general.

I have a DAC that has a 16-bit register and I need to write to it using SPI ... (more)

55
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## GATT Error 133 (0x85) Android 6+ nrf51

Hi everyone,

We're using our own customized BLE service with nrf51 on the one side and Android Smartphone on the other. While connecting to the GATT I'm getting Error 133 (in onConnectionStateChange()). The frequency depends on the phone ... (more)

40
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no
1

## How to establish a communication with PCA10028 (programmed without ble-nus) through an Adafruit BLEfruit LE friend USB dongle?

Hi everyone,

I would like to know if it is possible to establish a serial communication to a PCA10028 card using Adafruit Bluefruilt LE friend knowing that there is no ble-nus programmed in the DK and I may note rewrite ... (more)

108
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no
1

## How to use BLE of nRF52840-PDK and RIOT OS?

Hello,

I am currently working on nRF52840PDK baesd project, where I want to use BLE using RIOT OS. So, please can you provide any example for RIOT OS based BLE or any details/procedure?

Or how I can use softdevice ... (more)

63
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no
2

## Problem buiding the tutorial "A beginner's tutorial: Advertising" [closed]

I am trying to build the project which I downloaded from github for the "A beginner's tutorial: Advertising" but I get errors for missing files when I try to build it both in Keil and Segger IDEs.

I know ... (more)

151
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no
2

## Notifications disappear on their way

I use two nrf51 chips, one of which works as central and second one as peripheral. After the DM_EVT_LINK_SECURED event is generated on the peripheral side I'm starting the app_timer in single_shot mode with a 15ms period. Inside of ... (more)

70
views
1
vote
1

## Recommend DC-DC inductor component selection for custom nRF52832 Board PCB design?

Hello sir,

I have completed PCB design of custom nRF52832 board. Can i use following component instead of recommended part No in reference design. I have also mentioned mft part no that will be use. Because this recommended part number ... (more)

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