# 23,161 questions

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Hi Nordic and fellow developers, I have been working on upgrading the nRF51822 QFAA s110 and upgrading the soft device to work as s130 for its (simultaneous Central/Peripheral/Broadcaster/Observer) advantages. The client wants the s130 for a project ... (more)

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Using nRF52832 I am collecting from 8 SAADC channels using example ble_app_uart__saadc_timer_driven__scan_mode as a guide. AIN3 (P0.05) gives incorrect results. Because P0.05 is nominally UART RTS I have cut sb22 and sb13 as suggested in the documentation, set ... (more)

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## TWIM (i2c) SCL clock is half the expected frequency

On nRF52, I see that 100 kHz gives a SCL period of 10 us which is correct but for 250 kHz, I get 8 us instead of expected 4 us. Similarly, for 400 kHz I only see 5 us instead ... (more)

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## nRF52810 Development

It looks like the "NRF52-DK" development kit I can find comes with an nRF52832 chip, but I'm looking to get a dev kit to develop for the nRF52810. I did also find a "NRF52840-PDK" to develop on the 2840 ... (more)

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## Recover DK-Interface IC Firmware

Hi there,

I'm using a nRF52-DK for a while, but now I made a bad misstake: overwrote the interface firmware. I pressed accidentally the RESET button and flashed a wrong hex file. Now it does nothing, no blinking LED ... (more)

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## How can I send a signal from one pin to another pin?

Hello! I am receiving a signal from a RC charging circuit in an input pin and I would like to output this signal to another pin. So that I can see the delay between the received signal and the original ... (more)

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In single bank mode, need upgrade bootloader by DFU. Performing below procedure, APK shows "transfer complete". Application on target device is disappeared, but bootloader is still running with older one. We made some changes to tell new bootloader from the ... (more)

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Hello!

I'm trying to read data off of a commercial blood pressure monitor (Qardio arm) using an nrf51822 with the nrf51 SDK v10.0.0 as the central role (s120). I am able to connect using sd_ble_gap_connect() and run ... (more)

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## nRF52832 & nRF52840 Pinout

Hi, we are using nRF52832 and running into memory issues as we add functionality.

It would be great if the '40 was available as a drop in replacement in WLCSP package. Any plans for this? Or '32 with more Flash/Ram?

Thanks!

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## ble and spi in nrf52

hello , I am working spi with softdevice(i.e., bluetooth). here spi master is nrf52 and spi slave is ad9837. the spi interface code works fine without soft device(i.e.,ble) but with softdevice and I am integrate that ... (more)

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## Determine RAM usage with arm-gcc

Hi,

I have an application that utilizes the dual bank bootloader and s132 soft device on the nRF52832 chip. I am trying to determine the total RAM used and can't seem to find a simple solution. I am using ... (more)

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## Introducing FIFO buffer in uart_data_handler function..

I am working with ble_app_uart code, in that I am trying to send continuous data over BLE. But the BLE getting disconnected while sending large data.

So I planned to have an FIFO buffer which should continuously receive and stores ... (more)

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## Creating network of beacons as an advertiser and any MCU as a central

Ciao all,

Two weeks ago I have started to learn about beacons and their usage. I have bought pca10040 development kit and designed custom nRF52832 based beacons. After following the tutorials and instructions without having any problem, I realised that ... (more)

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## What does mask and "1 <<" mean!

What does mask and 1<< mean in the following code:

#define BSP_LED_0_MASK (1<<BSP_LED_0)


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## Best Way to Keep Track of Time with the nRF52

I need to keep track of time on a device featuring the nRF52 and have an RTC run continuously in the background. The drift should not be more than a few seconds over a year. Is this possible to achieve ... (more)

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## IAR nrf52832_xxab.icf error

Hello,

I noticed the linker file we were using was for the nRF52832_xxAA so I got the nrf52832_xxab.icf from C:\Program Files (x86)\IAR Systems\Embedded Workbench 8.0\arm\config\linker\NordicSemi\nrf52832_xxab.icf.

After switching linker files ... (more)

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## freertos SysTickHandler problem

Hi,

I am working on nRF52 with freertos + SDK13.0 + sd S132_4.0.2. I found the device will be trap in the xTaskIncrementTick of the xPortSysTickHandler when some task is busy, e.g. streaming data from a spi sensor ... (more)

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## Add Buttonless DFU service to my Application Code

Hello,

I need to add firmware update process via air to my NRF 51822 device that runs application code on stack 12.2. How can i achieve this?

1) Do i need to add buttonless DFU library (from Experimental_Buttonless_DFU example ... (more)

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## Sniffer not showing up my device.

Hi, I am using radio with ppi to advertize packets as shown in the mainc file attached.mainc.txt Even after allocating the access address of Bluetooth on line 196 as set_address0(0x8E89BED6); and advertizing channel selected as 37 as ... (more)

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## To use notification, I must enable the CCCD of my target characteristics, identified using UUID, right?

Hi, I want to enable notification for a specific characteristic, and to do that, I must write 0x01 (in java it's going to be "01,00" ) to the CCCD handle of this characteristic, right? Question #1

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## SPI hangs within RTC CC callback [closed]

Hi all,

I'm transferring data to and from an Atmel AT25040 NVRAM using SPI, and it works perfectly when run within main(). However, if I run the same code from within an RTC CC callback, the blocking call to ... (more)

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## Board not connecting to app

I added a few custom services the ble_app_hrs code. I tried to flash the code, it was successful, the device is advertising but not connecting in the nRF connect app. What could be the problem? Is the problem because of ... (more)

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## Unable to control GPIO pins in nRF51422

Hello, i am a beginner, i want to configure an LED to be connected on one of the GPIO pins, please help me with the code.

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## Unable to Run Application hex after OTA

Hi, i am using nrf52, sdk11 and S132v2.0.0. so i want to flash the hex file using OTA so that, i have create zip file using fallowing command.

nrfutil dfu genpkg --application /nRF5_SDK_11.0.0_89a8197/examples/ble_peripheral/ble_app_hrs ... (more)

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## accelerometer_result_error

Hello ,I wrote a program that allows to control the LIS2DE12 accelerometer but I am reviewing a fixed result which is always X = 72, Y = 33, Z = 32, I find out where the problem , thanks you in advance. `int main ... (more)

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## Maximum number of elements under advertise

Hello,

I want to develop small modules with smart BLE that only sends advertise every 2seconds.

Do you think that the Central module can see all peripherals if the installation is composed by 100 modules sending advertise?

Thanks! Xavier

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## Not getting any signal from uart tx pin in nrf52 dk using ble_app_uart and simple uart example. Why?

I'm trying to interface bno055 with nrf52 dk (PCA10040). I had written the relevant code for the nrf52 dk and added the same to ble_app_uart code and simple uart code. I'm using sdk 12. The code compiled without ... (more)

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## NRF52832 Flash write

Hi,

For the NRF52832, I read that a number of write (per block) is limited before a forced erase of the page. Apparently, the amount of write is 181 times for a block of 512 Bytes. I would like to ... (more)

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## How to add DFU service in FREERTOS

Hi

I use sdk 12.3 with custom board.

How to add a DFU service to the FREERTSO hrs exaample code?

Thanks.

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• Resolved questions: 9682
• Total questions: 23161

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## Recent questions

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