# 53 questions

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## App stuck on "DfuTarg" when trying buttonless DFU

Hi everyone,

I'm using SDK 12.2 on nRF51822. Trying to get the buttonless dfu app example to work. Here's what I do:

Compile buttonless dfu app.

Generate settings:

nrfutil settings generate --family NRF51 --application nrf51422_xxac.hex --application-version ... (more)

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## Updating a display from events

I built my project on ble_app_uart peripheral example from SDK 12.2 and have added a display (Sharp LS044Q7DH01) using nRF52 as a SPI master to communicate. I think I have DMA enabled but I am not sure (...)

This is ... (more)

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## how to implement Whitelist in SDK12.2.0 [closed]

Hi, I test Whitelist function in the example ble_app_hids_keyboard_pca10040_s132 using SDK12.2.0. I donnot understand the code in "case BLE_ADV_EVT_WHITELIST_REQUEST:" located in function on_adv_evt(). Following is my question:

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## cannot bond in the example ble_app_hrs_pca10040_s132(nrf52832)

Hi,

I use ble_app_hrs_s132 project for experiment on bonding function. The version of SDK is v12.2.0. It seems that this example has all the conditions the bonding function needs according to the document. Following is all the step ... (more)

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## How Can I limit Gatt Data bytes that I write? (Not With Zero-Fill)

I created an characteristic that has MAX_Length = 20 Bytes characteristic.

And When I'm trying to write less than 20bytes on this Characteristic, It Always send with 20Bytes with Zero filled data bytes.

For example, I'd like to write ... (more)

62
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1
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## Can I run the ble_app_uart example code from nRF5_SDK_12 with S130 on nRF51822QFAAH0? [closed]

Story Short: When trying to run the ble_app_uart example on a custom board with a nRF51822QFAAH0 chip, the code faults and resets at the point in tries to call sd_softdevice_enable.

What are the prerequisites for running the examples of the ... (more)

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## I2S timing

Hi,

I am currently testing a DAC with I2S input supplied by the nRF52832. But unfortunately no signal is coming out from the DAC, furthermore when reading the error registers on the DAC through i2c I get a clock error ... (more)

43
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I use NRF51822_xxaa, sdk12.2, arm_gcc 4.9_2015q3 when i flash hex file experimental_ble_app_blinky_pca10028_s130.hex from C:\NRF\SDK_12.2.0\examples\ble_peripheral\experimental_ble_app_blinky\hex folder then it works fine (i can discover ble device and led blinked when i ... (more)

66
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## SAADC always busy, error 17, cannot calibrate

I've looked through and tried many examples on getting my SAADC to produce a temperature offset. About a month ago I had the SAADC working really well with a wheatstone bridge pressure sensor. It used a single channel differential ... (more)

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## SDK 12.2 - Build error in sdk_resources.h when included from C++

Issue when using SDK 12.2 which needs to be fixed in SDK:

sdk_resources.h will not build when included from C++.

This is because start extern "C" {" is placed in wrong place within #define ESB_PRESENT. It should be moved ... (more)

62
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Hi,

Similar questions have already been posted but they don't seem to fit to my problem...

Basically I want to advertise 3 primary services, starting from the 'experimental_ble_app_blinky' example: the already provided lbs service and two new ones. For ... (more)

115
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## Can i send more than 20 bytes in BLE 4.0?

I tested a 23byte data transition in iPhone 5s with Softdevice 3.1.0, sdk12.2 . it is ok. I know that iphone 5s is ble 4.0.

So I thought it would be possible on Android(Galaxy tab s ... (more)

58
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1
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## SDK 12.2 build errors using BDS

Using SDK 12.2 and BDS plugin version 1.2.2 Module nrf52832_xxaa

• Copied plugin output to nRF5_SDK_12.2.0/examples/ble_peripheral/experimental_bluetoothds_template/
• cd pca10040/s132/armgcc/
• make

Compiling file: softdevice_handler.c

../../../service_if.c:5:24: fatal error: app_trace.h ... (more)

42
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## Changes in NFC Type 4 library from SDK 12.2 to SDK 13?

I see in the SDK 13.0.0 release notes that the NFC type 4 library was updated to "production ready", but I couldn't find a summary of the changes made to the NFC Type 4 library.

We're ... (more)

66
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## Identifying beacons with 128 bit UUID

Hi,

I am working on a project where I have 4 advertising beacons which will have to trigger some functions in the central side when it gets the advertising data. Now I am currently working on the central(ble_app_uart) side ... (more)

64
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## nRF52 dk issues with bonding PM_EVT_CONN_SEC_FAILED is called every time [closed]

Hi

i am trying to connect ble_app_proximity with ios (10.0.2), but every time it is generating PM_EVT_CONN_SEC_FAILED for pm_evt_handler with sdk 12.2.0

i need to implement whitelist functionality once device is connected.

Thanks

139
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## Sharp Memory LCD LS044Q7DH01

Edit: The code posted below works on the 96x96 3V(LS013B4DN04) variant of the display, I still have no idea why it doesn't work on LS044Q7DH01, but I'm guessing it doesnt have much to do with the nordic ... (more)

91
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1
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1

## How to use sd_rand_application ?? or use Random number with NRF51 ?

I've tried to use stdlib's random generate function.

and as usally all of the basic C language's random generate functions does, I've used srand with Seed based random. (And also, used with time(null) argument like ... (more)

65
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1
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1

## nRF UART driver initialization

Hello, i'm trying to use nRF UART driver (nrf_drv_uart) to implement a high level UART manager. I followed indications on SDK documentation but it doesn't work and i think that is a problem of initialization.

Configuration: nRF52832 - SDK ... (more)

76
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2

## Change tick value of timer compare event [closed]

Hello,

I'm using TIMER1 to generate a timer compare event. I connect the event with the sample task of the saadc like in the saadc example from the SDK. Everything works fine.

But now I want to change the ... (more)

40
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## random number pool size & refresh

Is there a way to increase the size of the random number pool, and does the pool refresh periodically, or is there a way to manually trigger a refresh of the pool. Our application is requesting a 16 byte block ... (more)

116
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## Power consumption for NRF52832 SoftDevice v3.0.0

Hi,

My apology if this question has been answered. I wonder if >2mA current draw for an APP with the following design considered normal consumption?

1. Custom GATT profile
2. Device Information Service profile
4. Power_manage() => Verified that the device ...
(more)

58
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## How to increase throughput for BLE GATT profile?

Hi there,

I am currently working on a custom GATT profile for constant data streaming. I have to keep to GATT because I need multiple attributes to keep track of different data and for sending commands. So far, I have ... (more)

108
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2

I have a project I've developed on a dev board, and everything works. When integrating this into a custom board and running the firmware, however, I'm not getting any BLE radio signal whatsoever. I'm flashing the same ... (more)

41
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1
vote
1

## Set Characteristic Handles

To maintain compatibility with our current systems we would like to be force characteristics to be at certain handles, rather than having the soft device assign them sequentially on creation.

Is this possible with the current soft device?

91
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## DFU Implementation Issues [closed]

I am attempting to implement buttonless DFU with my application.

Using SDK v12.2.0 on a Rigado BMD-300 module (nRF52832)

Starting one step at a time, using nRFgo Studio v1.21.2.10, I can completely erase the flash ... (more)

178
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## Problems with DLE on nRF52832DK, SDK12.2, S132v3

Hello Nordic developers,

I have been unsuccessfully trying to use the extended ATT_MTU / DLE sizes for increased throughput on a nRF52832DK board running the Nordic UART Service, using SDK 12.2.0 and S132v3.1.0. I am trying to ... (more)

81
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1
vote
1

## How to force word alignment for FDS?

The FDS requires data to be word-aligned and multiple of the word size. How do I ensure that my source/destination data structures are properly sized/aligned?

E.g. I want to read and write a 13 byte data structure ... (more)

247
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## Error 22 (0x16): GATT_CONN_TERMINATE_LOCAL_HOST only on Samsung XCover device

When I run the BLE peripheral HRS example on the eval board and try to connect with a Samsung XCover3 using the "nRF Connect" app, I got the error 22 (0x16): GATT_CONN_TERMINATE_LOCAL_HOST.

Doing the same with a Sony Xperia ZL ... (more)

115
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## Eddystone EID slot's IK is not properly restored from flash on POR [closed]

Hi, this is for anyone having problem with the eddystone EID after reboot. There seems to be a problem that the EID slot will write the encrypted IK to flash instead of the plain one.

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