# 1,158 questions

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113
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## nrfutil v0.52 dfu serial / ble - HCI packet in terminal

Hi,

I'm using nrfutil to update my nRF52832.

I change target from nRF51822 to nRF52832 and I want be able to bootload my target through own master.

In past, I used hci_dfu_send_hex.py in verbose mode to convert hex ... (more)

19
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## Serialization S132 strange behavior

Hi,

I am currently using the NRF52 in a serialized application, with the SPI bus. I am using the SDK 12.1.0 and the softdevice S132 V3.0.0

My application is running well, as expected : We perform scanning ... (more)

26
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## NRF52 SPI CS Not working after wakeup

We have used a logic analyser to verify this.

SPI initialised and talks nicely with an ADXL362 accelerometer part.

We have interrupts configured.

We go into sd_power_system_off()

Move board, interrupt fires, system wakes up (as no RAM retention or anything ... (more)

17
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## Segger for Mac Copy Keil Project to Start

I am using Segger for Mac. I followed the tutorial on importing a Nordic example from the Nordic SDK 12.0 examples folder. It is the UART BLE Peripheral Example.

I got it all working and now want to start ... (more)

30
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1
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1

## detailed example to create a custom bootloader?

Hello ,

following are my requirements :

1. to create a secure bootloader which checks app validity at every boot .
2. the boot loader should also accept UART communication .

following things i have tried :

1. Stripping the secure DFU bootloader exanple just to boot into ...
(more)

139
views
1
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1

## NRF52 Sleep Mode and BLE Advertising MBED

Hi all,

first of all I'm new to NRF and BLE applications so I'm truly sorry if some of my questions are very basic and if answer to some of them is already posted somewhere. I probably should ... (more)

191
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2
2

## How to send longer than 256 bytes in nRF52 spi list mode with nRF5_SDK_11?

Hi: Recently, I want to use nRF52 to read or write some data from a flash chip(w25q128bv) by using spi, I've read Manufactures ID correctly, also, I have wrote a register of the flash chip and read back ... (more)

16
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## nRF52 DK UARTE with EasyDMA TX and RX

Hi!

Does anyone run UARTE with EasyDMA enabled? I don't want to use interrupts and simply copy every received UARTE bytes to global tx_buffer....and pooling with amount of data / parsing data or workaround timer related with RX_pin activity ... (more)

69
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1
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1

## GPIO state during deepest sleep mode

Hi, Do the nRF52 GPIOs retain their pullup/down or drive characteristics when in its deepest sleep mode? VCC is still applied, but otherwise, the chip is to consume a minimum of power, waiting for a wakeup on another GPIO ... (more)

25
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## Buttonless DFU, How do I enter DFU via iOS? [closed]

Hi

I'm testing Buttonless DFU. I use SDK 12.2.0 , NRF52 and S132. I succeeded in entering DFU in Master Control Panel (PC application). I want to do it even on iOS.

I tried the following three, but ... (more)

42
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1
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1

Simple question:

• I successfully use ble_advertising_init () with adv_data, scan_data and adv_opts.
• I include manufacturer data via scan_data.p_manuf_specific_data = &manuf_data. This also works well

Now I want to change my advertising packet by dynamically altering one byte only in my manuf_data ... (more)

39
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1

## Microsecond timer for nRF52

Hello,

I would like to implement a precise timer which calculates/counts the time in microseconds which I can use for calculating the time elapsed between parts of the code. The timer just needs to run continously and start over ... (more)

72
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1
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2

## System Off and GPIOTE

I have multiple GPIOs that are configured to use GPIOTE in my application. When one of these GPIOs is in the active state I start timer. Once the timer expires I want to enter system off using sd_power_system_off() and I ... (more)

71
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1
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1

## NFC_T4T_EVENT_NDEF_UPDATED gets fired twice per NFC Write?

It looks like NFC_T4T_EVENT_NDEF_UPDATED gets passed as the event attribute in the nfc_callback function whenever a new NDEF message is written.

Is this expected behavior? Is the first one fired when the write starts and the second one when the ... (more)

25
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1
vote
1

## What are the right memory mapping for nrf52 & SEGGER Embedded Studiov3?

HEllo,

I am trying to compile for the nrf52 one of the examples that are included in its SDK12.2, to be precies, I am using experimental_ble_app_blinky_pca10040_s132, I have been able to compile it with KEIL but now I would ... (more)

26
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## Buttonless DFU - Transfer Succeeds, but no BLE device available after

I'm working the the NRf52 dev board and SDK12.2. I was able to successfully load the standard DFU example and then use the NRF Toolbox on an android to load the example HR zip file to the device ... (more)

31
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1

## Radio can not work inside timeslot handler

I'm trying to transmit a radio signal inside time slot handler, the code is like:

  switch (signal_type)
{
}


However, the code is stopped inside the "while(.)" loop ... (more)

38
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1

## fds.c: m_op_queue.rp uninitialized

i don't see where the command queue index, m_op_queue.rp, is initialized.

when queue_process is called, the following line blows up:

fds_op_t   * const p_op = &m_op_queue.op[m_op_queue.rp];


this occurs when using peer manager and a new device bonds ... (more)

53
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## Possible SPI master bug when using DMA

Hello,

I've been implementing DAC control trough SPI and DMA using the NRF52 and it is working nicely. During development however I encountered what i think is a bug in the SPI master driver. It occurs when calling the ... (more)

36
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1
vote
1

## No serialization firmware - nrfutil by pyinstaller

What I am trying to achieve is single-file executable for nrfutil tool, for performing DFU. I downloaded sources and built it using pyinstaller. I can succesfully create DFU package.

Problem comes, when I want to perform dfu with -f parameter ... (more)

775
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1
vote
1

## PDM microphone (02730A0019 or AKU242) electrical connection to nRF52832

Hi,

I am connecting the AKU242 straight to our microprocessor. It is a PDM interface so it has a SELECT, DATA, CLOCK, VDD and 5 GND signals. On the datasheet, there are two identical PDM microphones with one SELECT connected ... (more)

25
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## nRF51 to nRF52 migration crash in SVC_Handler from HAL_CM4.c [closed]

Hi,

We're trying to port and migrate our nRF51 SDK v8 (softdevice s110) codebase to nRF52 SDK v11 (softdevice s132), but we're seeing a crash occur (goes into HardFault handler, shows up as INVSTATE in UFSR register). Debugged ... (more)

52
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1
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1

## Buttonless DFU Timeout

Hi,

What happens if a user initiates DFU but never continues the process of uploading an image, does the device sit in this mode indefinitely long?

How might we implement a timeout back to application if say, no image has ... (more)

19
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## nRF52 migration crash at SVC_Handler with HAL_CM4.c

Hi,

We're trying to port and migrate our nRF51 SDK v8 (softdevice s110) codebase to nRF52 SDK v11 (softdevice s132), but we're seeing a crash occur (goes into HardFault handler, shows up as INVSTATE in UFSR register). Debugged ... (more)

119
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1

## EasyDMA array list

Hello, in the nrf52832 PS I've stumbled over the "EasyDMA array list mode". From the description, I'm unable to understand, how this works and what I can archive with this mode (or which problem this mode solves).

Does ... (more)

44
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1
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no

## Secure DFU, how secure is it?

Hi,

We are expecting many of our devices to be in close proximity. How can we be certain that when a user initiates a buttonless DFU, that they are uploading to the correct device?

Could an attacker be listening for ... (more)

27
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1

## Can I use BSP_BUTTON_ACTION_LONG_PUSH w/ FreeRTOS?

Hi, for my project (its based on FreeRTOS) I was trying to reassign button actions in order to detect a long push event, what obviously doesn't work at all. In bsp.c i saw that app_timer_create/start/stop will ... (more)

19
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## sd_flash_write in BLE event [closed]

Hello, i have read all posts about writing to FLASH when using BLE. But could not find the desirable method.

What i would like to do is to write to flash from characteristic write as it comes. The problem: sd_flash_write ... (more)

36
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## Scan and identify BLE Beacon using UUID

Hello! I'm a new user to NordicSemi and I'm currently working on a project where one nRF52 DK is a beacon and another nRF52 DK is an observer. The observer is supposed to listen for advertisements and recognize ... (more)

323
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2
2

## nRF52 PWM Glitch Error

I have an implementation that is using a PWM output to drive a LED. It has been observed that when the LED is on in a constant drive state, fixed PWM output train, the LED will "flash". i.e. change ... (more)

#### Statistics

• Total users: 16445
• Latest user: Gretta Arnett
• Resolved questions: 8579
• Total questions: 20015

## Recent blog posts

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• ### New NFC feature on nRF52 Series: Read/write capable Type 4 Tag NFC library in nRF5 SDK.

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