# 27,077 questions

21
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## nRF1822 BEACON and nRF1822 QFAA-R7 difference

was just wondering if there is a difference between the nRF1822 BEACON and the nRF1822 QFAC-R7?

the first one cost around $30 and the second one cost around$6.

I found this on this website https://www.semiconductorstore.com/nR ... (more)

186
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1
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1

## How can I avoid sending a repeated start between TWI write and TWI read?

I am communicating with a temperature sensor (MLX90614), which has flag register. However, in order to read this register, I must send a read sequence without issuing the repeated start between the write and read operations. Here is what I ... (more)

13
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no
no

## How to write sensor values into Tx characteristic of NUS service?

Hello All,

I want to write the peripheral code which will send sensor reading to central.

For that I started looking into the Uart_Nus peripheral code from SDK. I tried to write some hard coded values using ble_nus_send_string() function but ... (more)

16
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## change MAC address in ble_app_beacon example

Greetings,

For my application,I need to change the nrf51's mac address. Previously I have changed the MAC id using the following code,

22
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1

Hi,

We have a BLE Tx (Transmitter) and BLE Rx (Receiver)

BLE Tx : Nordic nrf51822 (Role: Peripheral, Server)

BLE Rx : Other chip (Role: Central,Client)

BLE Service used : NUS Service

We are able to establish ... (more)

23
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## is it possible to print text message from fb using ANCS service

Hi, i am working ANCS example project in nrf14.1.0 SDK, s132.5.0.0 softdevice. i am able to print category of all notifications. i wanted print text message info. is it possible to get tex info using ... (more)

44
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1

## Is there any easy way to read PS2 protocol? [closed]

Hi

I am currently working on a BLE mouse device. NRF52832. BLE part works well. However, the mouse stick part is using ps2 protocol. I didn't find USART in NRF52832.

May I ask, is ther any easy way to ... (more)

15
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no
no

## Can ble_notification interrupt be missed?

Hi, I tried using ble_notification interrupt to 'warn' me before the start of radio activity so that I can get around the CPU blocking issue. But, for some reason, for 1% of the time, ble_notification interrupt was missed. I have ... (more)

8
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no

## user code space in Peer manager. [closed]

Simple to see the source, found by default, Peer manager takes 12KB flash, because I do not have enough time to see the source, for the following here I have a few points to confirm:

my goal: use peer manger ... (more)

32
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no
1

## Multi ble_app_uart to one ble_app_multilink_central [closed]

Dears, I would like to implement a solution for multi-nus(peripherals) to connect one ble_app_multilink_central(centrals). Is it the right way to implement multi-nus connecting to one central(blinky)? I have checked the developer zone about multi-nus with one central ... (more)

34
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2

## [Common BLE] Filter to connect ? [closed]

Hi. I have a central device call C_Board. It is scanning to find device has name is "123456" . This meaning is any device has name "123456" can connect to C_Board. Have any solution to choose device to connect? Thank for help.

47
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1

## How to make the device in the Apple phone settings inside the Bluetooth search and can connect

How to make the device in the Apple phone settings inside the Bluetooth search and can connect

25
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1

## Implicit declaration of function sd_ble_gap_address_get in invalid in C99

First of all, how do I know which version of the SD I'm working with when I'm flashing an example app from an SDK? I know I'm flashing SD 132, but I need to know the exact ... (more)

19
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## Porting Project from SDK12.2 to SDK14.1, SAADC issue

app_timer 1000ms triggering 1 Blocking SAADC read (For battery service, default Bluetooth SIG battery service)

ret_code_t err_code;

err_code ...
(more)

56
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1
vote
1

## Multiple SAADC channels with Multiple BLE Characteristics

I have 2 Channels with SAADC taking samples. They are configured to respond to BLE characteristics that have read and notify properties, each channel has its own characteristic it responds to.

For BLE characteristic notifications I setup a double buffer ... (more)

168
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3

## is it possible to connect nrf52 thingy to another nrf52 soc peer to peer?

can i connect iot sensor node nrf52 thingy to another nrf52 soc via ble or IEEE 802.15.4 and access it on cloud

24
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1

## Retain Some Peripherals status after a watchdog reset over nRF52

I write an application on nRF52 where the Watchdog Timeout event should automatically clear a GPIO and start a PWM signal on another GPIO using PPI.

The issue is that Watchdog timer will always reset the chip and hence reset ... (more)

25
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no

## What was the LF_SRC_RC clock fix between SDK 11 and SDK 14?

We have a device running SDK 11, without a crystal. It was using:

#define NRF_CLOCK_LFCLKSRC      {.source        = NRF_CLOCK_LF_SRC_RC, \
.rc_ctiv       = 16,
.rc_temp_ctiv  = 2}


With these settings, android phones would stay connected, but iPhone would disconnect after somewhere between 30 minutes to 2 ... (more)

48
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1
vote
1

## sd_flash_page_erase on nrf52840 takes a long time

Hi

We are seeing a significant delay in a flash-related operation on the nrf52840, specifically using the function sd_flash_page_erase() When we use that function to erase flash it takes up to 3 times longer on the nrf52840 than it does ... (more)

82
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2

## Updating bootloader + SD from SDK13 to SDK14

I have SD 4.0.2 + 13.0.0 secure debug bootloader, and I am trying to update it to SD 5.0.0 + 14.0.0 secure debug bootloader. It transfers the data, goes to 100%, but after that ... (more)

38
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3
2

## Why do we need to encode data in Heart Rate Measurement profile?

Hello,

Looking into the characateristic of Heart Rate BLE profile, I've come accross to the function hrm_encode(ble_hrs_t * p_hrs, uint16_t heart_rate, uint8_t * p_encoded_buffer), and I start to wonder, why do we need to encode the data with this function ... (more)

26
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1

## Using nRF52, S132 for NFC over Serialization

I am using the nRF52832 with S132 Softdevice via SPI Serialization from an STM32 MCU. I am looking to use NFC for Pairing, but I don't see any references on if / how this is possible. Looking through the SDK ... (more)

44
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no

## fds_record_update sometimes always returns FDS_ERR_NO_SPACE_IN_FLASH

Hi,

I'm using FDS instead of pstorage. FDS version is SDK13.0.0. fds_record_update sometimes always returns FDS_ERR_NO_SPACE_IN_FLASH though I call fds_gc after it gets FDS_ERR_NO_SPACE_IN_FLASH every time.

static void fds_evt_handler(fds_evt_t const * const p_fds_evt)
{
if (p_fds_evt->result != FDS_SUCCESS ...
(more)

27
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1

## DFU example doesn't work. need explain step by step

Hi!

nRF52. S132, SDK13.

I try to use ble_dfu_send_hex example.

1. what shoul I do first? via nrf gostudio load SD. correct?

Which SD? from this folder (dfu_test_softdevice_s132) Or usual SD (s132_nrf52_4.0.2_softdevice)

1. what should I do next?

49
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2
1

## Building micro-ecc with SES, SDK14.1

Hi, I'm trying to build the secure_dfu_ble_s132_pca10040_debug project and apparently need to add the mico-ecc library. The SDK instructions for building the library call out " 4.9-2015-q3-update of the GCC compiler toolchain for ARM". I'm using Segger Embedded ... (more)

14
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no

## Peer Manager and LESC [closed]

According to the message sequence here

if use LESC, there should be sd_ble_gap_auth_key_reply and sd_ble_gap_lesc_dhkey_reply, but I did not find the related internal implementation in the peer manager, do I need to manage the entire lesc pairing procedure with peer ... (more)

93
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no
1

## MPU9250 with PWM logic

Hello friends,

i am new to embedded programming and trying to learn the new things in embedded for this i am doing 1 project in which i am using mpu9250 with pwm.

is it possible to glow 4 different LEDs ... (more)

35
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1

## Drive SS(CS) in SPI manually with easyDMA

Hello I am using nRF52832, sdk v14.1, pca10040.

With regard to SPI, I am using the spi master in nrf_drv_spi.c to handle multi-byte spi transactions. I am able to do this successfully and the driver sets the SS ... (more)

40
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no
1

Hello,

I've just started using Segger Embedded Studio v3.30 for my development and I've been having trouble setting it up. I followed the instructions in this blog but I'm still having some trouble and getting some ... (more)

16
views
no
1

## NRF board don't init ble_uart_app example

Hi, I am testing with ble_app_uart . my board will advertising to my phone . I realize that if I don't connect 2 pin uart on NRF board to USB TO COM to my PC . Then , my board don't init ... (more)

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• Total questions: 27077

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