# 21,591 questions

102
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## Error 22 GATT_CONN_TERMINATE_LOCAL_HOST

Hi,all SDK:8.1.0 51822 S7 Edge（android V7.0）

i use the sumsung S7 Edge and the oppo R9S connect with my device,nRF Connect is often note:

GATT_CONN_TERMINATE_LOCAL_HOST(after discovery all service ).

And the oppo R9S ... (more)

25
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## How to calculate precise delay in nrf51822 for Timer ?

i m new in nrf51822 controller so help me for coding of my question. any help will be appriciate. thank you.

24
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## Tanotis Global ARM7 ARM9 ARM11 J Link V8 ARM Emulator cortex m3

Hi everyone, i have J TAG V8 and when i am using this with keil software and try to debugging then its showing-

"The connected emulator can not be used with this software."

Reason: "Broken. No longer used"

help me ... (more)

35
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2

## Using app timer in sdk13

Hi all,

I am using a nRF52832 with SD S132 V4.0.2 ion SDK13.

My application currently uses TWI, SPI and BLE and also 1 wire (which is based on delays). Everything works fine. The 1 wire is used ... (more)

54
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## Timer interrupt don't work in ble_app_uart of SDK6.1.0

Hello everybody

I am working with the Raytac BLE Module "MDBT40", which is based on nrf51822.

And I am testing example project "ble_app_uart" in the SDK6.1.0 now.

But there are some problems when I add a new timer ... (more)

26
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3
1

## nRF51 doesn't show up anymore aftering bootloader mode

Hello,

After (accidentally) entering bootloader mode on my nRF51 DK (PCA10028), the device doesnt show up either in the device manager or using nRFgo Studio (both not normally, as being in the bootloader mode where LD5 is blinking.)

In case ... (more)

15
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## Exact sequence of Peer Manager events at time of pairing.

Hi, I am performing "just pairing" using peer manager ( SDK 11.0 ) in my custom board which uses nrf52 chip.

I am getting this events

1 - PM_EVT_CONN_SEC_START, 2 - PM_EVT_CONN_SEC_SUCCEEDED, 3 - PM_EVT_PEER_DATA_UPDATE_SUCCEEDED - this events i am getting 4 times but sometimes ... (more)

61
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## Blink an LED in Emulated System OFF ??

Hi, I would like to be able to provide a visual indicator such as a blinking LED when the chip is in the Emulated System OFF mode. Note that if the chip is in DEBUG mode and a System OFF ... (more)

17
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## power consumption problem

Hi,

I'm using nrf51822 / sd130 / sdk 12.1. I am doing minimizing current consumption. My main function is like below. I checked no wakeup in sleep mode. But, current consumption changes variously. It is wide from ~30uA to 1 ... (more)

38
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2
1

## sd_ecb_block_encrypt() related question [closed]

Hello, I just want to clarity the sd_ecb_block_encrypt() operation cases (S110).

In pp. 23.1.3 of RM (Shared resources) sayed:

The ECB, CCM, and AAR share the same AES module. The ECB will always have lowest priority and if ...

(more)

47
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1
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1

## JLinkExe equivalent of nrfjprog --erasepage

Hello, We're using JLinkExe for production programming. Is there an equivalent of the nrfjprog --erasepage command for JLinkExe?

I'm looking for the equivalent of

nrfjprog -f nrf52 --erasepage 0x0007F000-0x00080000


It would be cool if nrfjprog could provide information ... (more)

29
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## Problem sending 6 bytes to multiple services using sd_ble_gatts_hvx

I would like to confirm my understanding of Problem sending 6 bytes to multiple services using sd_ble_gatts_hvx

I use nrf52832 sdk13.0.0

BLE SPI is master. I dropped the SCK to 1 Mhz I send x18 bytes of data ... (more)

16
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## making Tune instead of Beep using Bizzer with PWM library

i have added pwm into proximity profile example and now i am able to make beep using buzzer with pwm library.Now i want to make some sort of Tune instead of beep.

Can any one help!....Thanks.

16
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## Hardfault when using both UART and GPIOTE, how can I solve this problem?

Hello,

I feel like this question has an answer similar to this question, but I can't seem to get it working https://devzone.nordicsemi.com/questi...

I am using the nrf51422 chip on a board I designed myself and ... (more)

63
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## Help with restarting, debugging and size-limitations for DFU procedure needed

Hello,

while I already managed to solve a couple of problems regarding a proper handling of the DFU procedure in my previous topic here, there are still 3 problems that remain where I could use some help...

1) How can ... (more)

47
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## Does single bank bootloader in SDK7.1 support ZIP-file ?

Does single bank bootloader in SDK7.1 support ZIP-file ? I get error REMOTE DFU INVALID CRC ERROR in the end of flashing by nRF Toolbox when I use ZIP. If I use hex-file without init file I will send file ... (more)

35
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1
vote
1

## Interfacing External Sound Sensor with nRF52832

I have made following connection between nordic device and external sound sensor:

1. VCC--> 5V
2. GND--> GND
3. GATE --> Pin 04
4. ENVELOPE --> A0

I would like to know how to proceed with the code in eclipse. i have a code but i ... (more)

55
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3
2

## Inversense DMP with nRF51

Hi everybody,

Chip: nRF51422

Board: PCA10028

Firmware: S130_nRF51_2.0.1

I found it really difficult to write DMP driver for nRF51. I've already downloaded motion_driver_6.12 from the official website.

How do I translate it to meet nRF51 APIs ... (more)

27
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2

## nrf51 TWI burst write error [closed]

Hi everybody,

Chip: nRF51422

Board: PCA10028

Firmware: S130_nRF51_2.0.1

The system hangs when doing burst write reg. MPU9255 can work fine if all writes are [reg, data[0]]; How to solve the problem?

uint32_t i2c_write(unsigned char addr, unsigned ...
(more)

51
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## how to i use external interrupt ?

Hi, i am new in nrf51822. i want to make a pin as a external interrupt pin, whenever it get high to low pulse it will call in ISR. here i am unknown how to write an ISR here.

38
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1

## Can I use one NRF52832 as BLE HID keyboard, and another one is peripheral?

Hi,

I am newbie to NRF52 devices. My scenario is, I want to create a split keyboard which is left-hand part and another is right-hand part. Both 2 parts are wireless. I need these 2 parts WORK LIKE JUST ONE ... (more)

43
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1
vote
1

## nrf51822 sniffer confusing wireshark output

Hi all,

I'm trying to use the nRF51822 sniffer to troubleshoot my TI CC2650STK sensortag ble communication and the output is slightly confusing. The problem I am having with the sensortag is that the output I am getting from ... (more)

11
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## iOS NrfConnect crashes and NrfToolbox with heart sensor

So we have the Arduino 101 board talking to a heart rate sensor MAX30100. When we run the nrf connect app on android it is able to connect to the sensor with no issues. When we try connect through the ... (more)

27
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1

## I2S does not work as expected on nRF52832

Hello,

some time ago I was struggling with interfacing an I2S microphone with the nRF52832. That remained unsuccessful. My conclusion back then was that the selected I2S microphone and the nRF52832 were incompatible (the mic wanted 32-bit word size, which ... (more)

15
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## Disconnect during Connection Process after Successful Disconnect

BTLE connection failure.log

Hi guys,

We have an issue with some iOS devices that are disconnecting with reason 0x08, the connection timed out. The test procedure is,

1. We use various devices (5 iOS devices right now, also some Android ...

(more)

547
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2
4

## LCD Display Driver

Hello,

I bought a SainSmart display which fits on the PCA10028 development board. This display is a 16x2 character display with a HD44780 display contoller (I guess). Does anybody know if there is a driver available that runs on the ... (more)

74
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1
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3

## Ble Disconnect from peripheral and Stop Advertising

Hello ,

I'm working on custom board, I'm trying to disconnect from the Central (Andriod app) when the battery is below certain level and stop re-advertising. Below is the piece of code i used:

/* Disconnect and then disable advertising ... (more)

64
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2
1

## nRF52840 Meandering Antenna Placement & Layout Questions

Hi,

See attached photo for layout placement of the trace antenna.

Altium PCB File: 108-0013-01 PCBA MAIN.PcbDoc

Background:

This is a design for a wearable watch style product. Tight design mechanically, and hard to find an ideal placement for ... (more)

78
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1
vote
2

## Is it physically possible to set UART RX and TX to same GPIO pin?

I'm trying to implement send && recieve through one wire. Handling of pin state, if it is input or output is done via SW. Also it is going to be half-duplex only.

Is it possible to do something like this ... (more)

30
views
1
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1

Hi!

I am working with PCA10040 (nRF52), s132 and SDK 12.2.0.

I am using the example experimental_ble_app_eddystone. I have configured one slot as TLM, so it reports battery (value should be refreshed every 30 advertisments).

However, the battery ... (more)

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• Resolved questions: 9148
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## Recent blog posts

Posted 2017-04-11 11:49:17 by Radosław Koppel
• ### Taking a deeper dive into Bluetooth 5

Posted 2017-04-07 14:53:51 by John Leonard
• ### Logging enabled by default in SDK Bluetooth examples

Posted 2017-03-29 11:27:02 by Håvard
• ### Monitor Mode Debugging with J-Link and GDB/Eclipse

Posted 2017-03-29 05:56:12 by Daniel Veilleux
• ### Getting started with Nordic's Secure DFU bootloader, a step by step guide

Posted 2017-03-20 17:13:52 by Hung Bui

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Posted 2017-04-23 17:51:46 by yash
• ### how to flash programs on nrf51822 via nrf51 DK

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