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# 1,593 questions

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13
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## Intersection of PDM Module with TWI Module

Dear Nordic team,

I have a running NRF52 with a firmware based on the freeRTOS demo. To this demo I added the PDM Support Module and the TWI Module. As soon as both sensors are available, I get very random ... (more)

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## ERROR:Connection Request Failed, reason 7

I am using a NRF52-based platform and have BLE code based on the ble_app_hrs_c Hear rate monitor system.

Having set up for scan, I see many device (we have a lot of beacons around).

I can also see the device ... (more)

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## Implementing UART profile between NRF52832 (as central) and HM10 (as peripheral)

I am facing some issue, I am using HM10 ble module as peripheral and NRF52832 (Redbear NANO v2) as central device. I using SDK "nRF5_SDK_12.3.0_d7731ad" and example program "nRF5_SDK_12.3.0_d7731ad\nRF5_SDK_12.3.0_d7731ad\examples\ble_central\ble_app_uart_c". I ... (more)

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## nRF52 PCA10040 Bossa Program Port

Sorry for being funny English because I am using translation software.

Hello, I am using PCA 10040.Version is V1.1.0. I am in trouble because it is recognized as "Bossa Program Port" when I connect it with PC ... (more)

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## definition of clock parameters in SDK14 (sdk_config.h)

I ran into the issue where the clock definitions were defined in both the "board_pcaXXX.h" file and the sdk_config.h.

e.g. NRF_SDH_CLOCK_LF_XTAL_ACCURACY NRF_SDH_CLOCK_LF_SRC NRF_SDH_CLOCK_LF_RC_CTIV NRF_SDH_CLOCK_LF_RC_TEMP_CTIV

I didn't realize they had moved to sdk_config.h, and obviously, when ... (more)

166
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## What is difference between nRF52 DK PCA10040 v1.1.0 and v1.1.1 ?

I am very curious to know about difference between revision v1.1.0 and v1.1.1 of nRF52 DK.

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## TIMER_TASKS_START increases power consumption when TWI is in use from 13uA to 450uA

Hi, i would like to implement a very low power counter and used the template from this post. I've modified the example and used TIMER2 in counter mode triggered by LPCOMP through PPI. This worked fine and results in ... (more)

34
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## How to connect spectrum analyzer with NRF52840-DK?

Hi,

We were planning to use a spectrum analyser in order to do the radio test on the nrf52-dk. Where should the analyzer be connected? Should it be connected to the J1 connector on the nrf52-dk?

Also J1 connector is ... (more)

23
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## Power Optimized FreeRTOS? Any examples?

Are any of the freeRTOS examples Power Optimized? I've looked into other related posts but not sure anyone is seeing the same issues I'm seeing. I'm using a Rigado BMD300 and I can't get it to ... (more)

35
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## Can I use a newer softDevice(v5) on an old SDK(SDK12.2 SoftDevice v3)?

Hello

I was wondering whether is possible to use an updated version of the softDevice into an older SDK, my current hw is a nRF52832pca10040 DK

For example, I am currently working with the SoftDevicev3 since I use SDK12.2 ... (more)

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## NRF52 Interfacing sensor with serial through UART

I have a sensor with serial protocol of 7 bits data, even parity, 2 stop bits. I wanted to use uart library to interface with this sensor. But I couldn't find the settings to change data bits, even/odd ... (more)

41
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## Buttonless DFU - LED 3 blinking after flash

With SDK 14:

If I flash in this order:

1. softdevice_s132.hex
3. ble_app_buttonless_dfu_with_bonds_s132_with_setting_page.hex

Then complete a DFU with this application:

ble_app_buttonless_dfu_without_bonds_s132_with_setting_page.zip

The board goes into an unrecoverable state. Holding button 4 ... (more)

59
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## Where can i use Ble mesh

Hello,

I need to implement mesh networking capability in the beacons which are ble5. Can anyone explain me how do we achieve that?

I want send specific data via one beacon, that has to be transmitted to the second beacon ... (more)

98
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## [iOS] Reconnecting during full ota update, connect to wrong device

Hi,

we are developing and application on iOS which can among others, update our hardware over the air, and we found out that e.g. after bootloader update is done, then 'iOSDFULibrary' disconnect to the peripheral and connect again to ... (more)

492
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## nRF51 and nRF52 audio

Hello,

Is there any audio application example for the nRF51 and/or nRF52?

Thanks,

Fred

621
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## i2S SCLK and LRCK nRF52832 DK

Hi,

The i2S microphone that I am using requires a over sampling rate fixed at 64 therefore the WS signal (LRCLK on nrf52) must be BCLK/64 and therefore synchronized to the ... (more)

50
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## Power consumption issue with custom nRF52832?

Hello sir,

I have develop product on nRF52832 DK and now i using custom nrf52832 board Here. I want to continuously on my device with BLE advertising continuously no sleep mode. for high speed BLE through put and continuously advertising ... (more)

72
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1
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1

## nrf52 NFC with softdevice running

Hi all, Here is my first question on this forum after many hours working with the NRF but for the first time I didn't found the answer :)

My problem is : I would like to run the NFC in ISO ... (more)

38
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## Missing BLE_GATTC_EVT_WRITE_RSP

Hello,

I have a problem with writing to server characteristic (battery service and custom). sd_ble_gattc_write function returns 0x11 which means another write with response is ongoing. There is no BLE_GATTC_EVT_WRITE_RSP. Problem is after connecting when a lot of data is ... (more)

798
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2

## NRF52832 Eagle lbr

Hello

Not a question, but something i want to share. library for eagle: NRF52832 QFN48 (NRF52).

NRF52832.lbr

Hope someone can use it.

Nick

53
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1
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1

## Fast encoder sampling rate for nRF52xx

We need to sample two digital inputs GPIOs at rate of 100khz-1mhz. How can we do that? The QDEC is only good for up to 128us (~7khz) which is too slow for us. Is there a way to sample GPIO ... (more)

47
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Hi

I have a project use nrf52 to have a purpose below.

Maybe after some pairing process with smartphone.

The user can trigger the device(nrf52, may press a button).

The smartphone can have a notification that the button has ... (more)

82
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2
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## Configuring I2S for ICS43434

We are trying to configure the I2S peripheral for working with the ICS-43434 microphone (https://www.invensense.com/products/i...), but we are having a hard time fulfill the requirements of the clocks because they conflict with the nRF52832 equations ... (more)

38
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## Pre-load data in FDS, cloning devices

Hi everyone,

I am currently working on a project that leads me to save a respectful amount of data. Some of the objects that I save size a few KB actually.

I would like to use FDS all the time ... (more)

85
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## nrf_gpio_pin_read and optimized code might return wrong value

Hi, I have found an interesting behavior from this code:

nrf_gpio_cfg_input(7,NRF_GPIO_PIN_NOPULL);
{
NRF_LOG_INFO("ID1(P0.%d) is LOW.",7);
}else{
NRF_LOG_INFO("ID1(P0.%d) is HIGH.",7);
}


the nrf_gpio_pin_read will always return 0 as if ... (more)

49
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1
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1

## How expensive are characteristics?

I'm planning on having all of the different Device Information Service characteristics (fw_revision, sw_revision etc) with each being just a single integer for version number. Alternatively, I could combine them into one characteristic, i.e. "1.0.1".

With ... (more)

48
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1
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1

## loop in nrf_drv_uart_rx_for_uarte() after run uart_close()

Hi, now I'm using NRF52832 's UART with SD12 and it required to receive 40 bytes per 10ms.

In fact, it does not take 10ms to complete the reception.So my idea is to create a 10ms timer task ... (more)

32
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## NRF52 UART initialisation issue/crash due to low state on pin

Hi

First I wrote a post because the initialization was crashing, but now I found out it was because the RX line was low. How to initialize the uart if the RX line is low without modifying the hardware. Thing ... (more)

33
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## nRF52832-QFAB & S132-SD-v5 | ROM & RAM ?

Guys,

which are the right ROM & RAM settings for this combination?

92
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2

## Connection between Android phone and nRF52

Hello,

I'm having problems getting a stable channel from an Android device (LG K8) and the nRF52 development board. It is hard to tell whether which side is causing the problems. What happens is that one of the side ... (more)

#### Statistics

• Total users: 24452
• Latest user: Kristin Verdon
• Resolved questions: 10451
• Unanswered questions: 3309
• Total questions: 25466

## Recent blog posts

• ### 6 Things to Know about Bluetooth Beacons

Posted 2017-09-22 08:27:00 by Rose Martin
• ### Creating a Keil project for a Bluetooth Mesh example

Posted 2017-09-19 12:08:11 by Kristian Skordal
• ### Using millis() like in Arduino.

Posted 2017-09-18 11:58:04 by schef
• ### Flashing nRF5x firmware using any dumb terminal program via standard serial COM port

Posted 2017-09-18 03:53:40 by Nguyen Hoan Hoang
• ### How to Debug the nRF52 Interrupts — Useful Tips

Posted 2017-09-13 15:15:22 by Yaniv Nis

## Recent questions

• ### Device crashes when debug flags are turned on

Posted 2017-09-24 04:09:33 by tyler
• ### nrf52832 of UART problem

Posted 2017-09-24 04:05:27 by lenli
• ### RTT Stability

Posted 2017-09-24 03:28:49 by Yatekii
• ### HardFault with GPIOTE & SD

Posted 2017-09-24 03:18:09 by Yatekii
• ### Adding a service to existing SDK example code

Posted 2017-09-24 02:45:24 by alikob