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# 24,484 questions

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## SDK 14: issue with secure buttonless DFU

I was trying to verify the DFU functionality on SDK 14 on nRF52832. Here is what I did. 1. Using nRFgo to erase all 2. Program bootloader/soft device with C:\svn\nordic\nRF5_SDK_14.0.0_3bcc1f7\trunk\examples\dfu\secure_dfu_test_images ... (more)

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## nRF Cloud Gateway Error connecting gateway [closed]

Hello,

I'm trying to setup a nRF Cloud Bluetooth gateway using my PC (with openSuse 42.2 64bits and rRF Connect v2.1.0 + nRF Cloud Gateway v0.9.7) and a nRF52 DK and I'm facing some ... (more)

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## Cannot program WT51822-S4AT

I'm trying use an nRF51 PDK to upload firmware (or, rather, just confirm that I canupload firmware) to one of these modules: http://www.wireless-tag.com/wireless_...

The target is externally powered, so I've connected it like ... (more)

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## BLE characteristic array/set

i know that it's not up to you guys to tell me this but maybe you can give me a hint: right now i'm using the bluetooth developer studio together with the nordic plugin for code generation to ... (more)

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## advertising manufacturing specific data without company id?

Hello, we would like to release our product to the market.

Our device is a (BLE) beacon based on nrf52 which is advertising some data encoded as manufacturing specific data but with a company id of 0xFFFF which is for ... (more)

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## HCI command sequence for BLE

Hi,

I am new in BLE and working on existing product. i am adding BLE functionality in the existing product hence having one host MCU on my board. My product will be in central mode and will communicate with the ... (more)

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## LE Secure Connection Pairing, not encrypted

I am using the ble_app_multirole_lesc example to test out LE Secure Connection Pairing. I can pair and bond and see on the sniffer that it is actually doing LE Secure Connection Pairing. I can see the key exchange process and ... (more)

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## nRF_LOG UART draws ~300uA

Hello All,

I'm trying to get my application based on a nRF52832 to use as less power as possible and I've noticed that when the nRF_LOG UART is enabled it draws around 300 micro amps in SYSTEM ON ... (more)

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## nrf52840 Power Consumption

Hi There,

I am doing current measurements on the nrf52840 in sleep mode with no RAM retention and I am getting different values based on how I take the measurements. Please see the various methods and resulted below.

1. Using an ...

(more)

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## nrf52 GPIO sink & source current

Hi, I'm contemplating ways to drive a small RGB LED matrix with the nrf52832 in a really space-tight project. Ideally without any external components. I'ts maybe around 40 RGBs (5x8 grid, 120 individual LEDs to drive).

Charlieplexing would ... (more)

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## Build option not available on Blinky

I have installed and un-installed all the required components to run the dev kit with eclipse. As everyone knows this is complicated because there are multiple sources of instructions of different ages that sometimes conflict with each other or assume ... (more)

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Hello, I'm having latest nRF connect for Android v4.13.1. I'm running it on Samsung S6 (model SM-G920F) Android 7.0 nougat; build version (NRD90M.G920FXXS5EQG); Kernel from Jul 4 2017. I'm using phone as GAP ... (more)

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## TWI blocks after send receive sequences

Hello

I am using a custom board, based on nRF52832 CIAAB0. I have also S132 installed, and I am using SDK 13.1.0. TWI pins are P0.16 - SCL & P0.18 - SDA. The code is based on twi_sensor example ... (more)

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## Notifying characteristic value with 80 bytes each 20 ms gives me a BLE_HCI_CONNECTION_TIMEOUT in nRF-Connect

Hello,

I have a project in witch I want to send the data received from an Arduino by UART, this data has a size of a little bit less than 80 bytes, this data is received each 20 ms (a ... (more)

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## Errata 156 of nRF52832 Rev. 1

Hi all

I've two questions regarding errata 156:

1) Am I assuming right that, as long as I don't use WFI or WFE, this errata has not effect?

2) Are the two consecutive TASK_CLR[n] and TASK_CLR[n ... (more)

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## Can I use same handler for two different SPI's interfaces?

HEllo,

I was wondering whether or not is advisable to use the same handler to handle transmission/reception of data over SPI0 and SPI1 interfaces.

I have two sensors connected each one to each SPI, let's say sensorA to ... (more)

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## Uart on custom Board.

hello we have custom board with Nrf52840.

i already test the uart code on nrf52840 dk..every thing is working great. my custom board is connect to the nrf52840 dk with debug connector. debugging is working great on custom board ... (more)

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## BLE Scanning not working

Hi

I am trying BLE multirole application ble_app_multirole_lesc from the SDK 13.0.0. I am using nRf52832 DK along with GCC toolchain. For debugging I am using Segger RTT and have added some of my own debug string to ... (more)

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## Disabling S132 Softdevice when running FreeRTOS

Hi All, Nordic,

In my application, I don't always need BLE connectivity, so I was hoping to disable the S132 softdevice when not needed. However when I do this FreeRTOS stops working normally.

Any thoughts? Is there an alternative ... (more)

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## FCC certification for nRF51822 based remote control with Gazell

Hi,

I am developing a remote control device (and a receiver) based on the nRF51822 which will use the Gazell protocol. The hardware will be an own design or one of the 3rd party modules which are listed on the ... (more)

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## ble_app_uart_c on PTR5518 ble chip

Hi, I am working on ble_app_uart_c example provided in SDK12.3.0 with S130. I tried this example on PTR5518 ble chip but suddenly device goes resetted every time.I am printing some text from uart in real terminal using ... (more)

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## Why was a malloc with heap_size = 0 successful?

We started with the default project that have no heap. Added mallocs to the system and they seemed to succeed, without realizing heap was set to 0. They did not return NULL.

I would have expected the mallocs to fail ... (more)

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## BLE Mesh SDK along with peripheral mode.

I want to change the light-control example given in mesh SDK such that instead of using buttons to trigger messages, I want to connect client with mobile and control servers through mobile. At beginning, I am trying with one client ... (more)

1k
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## nRF8001 What is the maximum data rate with peered device?

As stated in standard the maximum data rate is 0.27Mbps. So is that is true for nRF8001 ??

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## Bluetooth Development Studio with Nordic plugin for SDK 14

In an earlier post ( https://devzone.nordicsemi.com/questi... ), Nordic indicated that a new version of the BDS plugin would probably be available when SDK 14 was released.

Do you have any news on this?

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Hi,
I need help with alert notification service. I am working on alert notification example provided in the SDK 12.3.0 with S130. I tried this example on nrf51422 development board and it is working. After changing to RAM ...
(more)

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## SPI MOSI default high? NRF SDK 12.2.0

I am attempting to interface a Winbond flash device with the NRF52. The datasheet does not specify the idle state of MOSI when reading from the device. However, I cannot make the flash chip work with the NRF52. In the ... (more)

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## Why Additional features of nRF Connect for Android only not for iOS?

I'm talking about these following features:

1. Parses values of most of known
2. characteristics GATT server
3. configuration Listing paired devices
4. Bluetooth low energy Advertising
5. (peripheral role) Simultaneous
6. scanning, advertising and maintaining multiple connections

7. Full support for Eddystone beacons and iBeacons ...

(more)

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## How to generate random keypass ?

I want to communicate Central and peripheral devices with KeyPass. Also I want to generate keypass in Peripheral device. But keypass should to include symbols, low/upper case and random character like "sP25Scw!HU?". I tried this code;

char *randstring ...
(more)

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## wakeup from any of 10 buttons

hello,

my custom hardware includes 10 buttons connected to 10 GPIOs of a nRF52832. The nRF52 is placed in low power or eventually system OFF all the time, waiting for a pin state change on any of the 10 buttons ... (more)

#### Statistics

• Total users: 23749
• Latest user: Zachery Eddington
• Resolved questions: 10098
• Unanswered questions: 3091
• Total questions: 24488

## Recent blog posts

• ### ble_app_hrs_freertos running in Atollic TrueSTUDIO

Posted 2017-08-14 02:55:30 by jmag999
• ### OLED display support for nRF52832 (SSD1306, Adafruit GFX)

Posted 2017-08-11 08:21:31 by Mahesh Venkitachalam
• ### I tried 5 different debugger IDEs for nRF52 and STM32. Here are my results.

Posted 2017-08-09 10:56:19 by Jonathan
• ### Things you should know about Bluetooth mesh

Posted 2017-08-07 12:37:22 by Eirik Midttun
• ### Support pairing on NUS profile for Central and Peripheral

Posted 2017-08-01 08:42:41 by Eugene Yu

## Recent questions

• ### SDK 14: issue with secure buttonless DFU

Posted 2017-08-18 00:38:25 by Rbai
• ### Cannot program WT51822-S4AT

Posted 2017-08-17 22:30:09 by zolotiyeruki
• ### advertising manufacturing specific data without company id?

Posted 2017-08-17 22:17:47 by gorazd
• ### LE Secure Connection Pairing, not encrypted

Posted 2017-08-17 20:40:50 by superpak
• ### HCI command sequence for BLE

Posted 2017-08-17 18:28:45 by Vishal Nandanwar