# 11,881 questions

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hello. i have microsoft mouse using 24l01 ic its usb receiver is lost. i have them in bulk quantity is there any solution for usb receiving end? thanks

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## BTprofile selection

Req: I am using nrf52 EVK kit for our project and project involves capsense , vibrational motor / sensor and accelerometer (to be used in future).

Question: so what profile i have to use in order to satisfy my requirement of using ... (more)

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## sd_flash_write() not generating system event

hi,
I have used sd_flash_write() in my code. The scenario is that sd_flash_write() will be called after a DISCONNECT event. And it would wait for system events : NRF_EVT_FLASH_OPERATION_SUCCESS / NRF_EVT_FLASH_OPERATION_ERROR. Once either of the system events occurs, it will re advertise ...
(more)

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## BL600 NUS service and DFU support

Hello,

I am using BL600A module and Nordic softdevice and SDK9.0. The system is having NUS service and TX and RX characteristic. Now I have a requirement for firmware upgrade OTA.

My question is, Can I use DFU and ... (more)

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## nRF51822 BLE example app doesn't work

Hello I am developing an application with BLE and I have just faced to a problem. I want to check my IDE settings and development environment.

I am using the development board "HRM1017" which is described here.

HRM1017
http://www ...
(more)

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## BLE question

hello there! i am working on project in which my one nordic BLE(A) want to send command to second nordic BLE(C) which is not in my range. now there is third nordic BLE(B) which is in range ... (more)

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## S120 assert in sd_ble_gap_scan_start() on 51422

Running S120 2.0 central on nRF51422 QFAAE0 (1504CH) and when I call scan_start() i'm getting 0xDEADBEEF at line 431 in file src\ll_lm.m0.c" Can anybody shed some light on this? Thanks Best R.

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## NRF_ERROR_INVALID_STATE when Bonding and wanted to resend Notifications without writing to CCCD again

IUsing the Master Control Panel application on my Android device to connect to my nRF51822 module (acting as the GATT server), I have implemented the Device Manager (v10 SDK) onto my BLE module and am able to bond the phone ... (more)

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## Co-channel collision

Hello,

I am designing a custom protocol using the radio as a peripheral. The protocol has the chance for two nodes to transmit at the same time on the same channel. My understanding is that if one is much quieter ... (more)

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## sd_ble_gatts_hvx() returns NRF_ERROR_INVALID_STATE (error code 8)

Hi

Try to send characteristic notification by invoking sd_ble_gatts_hvx() with the following parameters:

    uint32_t err_code = NRF_SUCCESS;
ble_gatts_hvx_params_t params;

memset(&params, 0, sizeof(params));
params.handle = GetValueHandle();
params.p_data = pData;
params.offset = 0;
params.p_len = &length;

if (srv ...
(more)

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## How to send nRF8001 notifications

Hi, I have peripheral device using the nRF8001. I'm using the Android BLE SDK on the MCU to talk to it. I am having a problem where I am using lib_aci_set_local_data() SDK function and not receiving command responses for ... (more)

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## Bricked? Dead? Running? cannot connect to any nRF device

So, I have made 3 custom boards (all boards have the same layout, with a nrf51822AC) and I've been able to develop code. I've been using the swd lines from the nrfdk (pca10028) to flash code onto my ... (more)

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## how can I specify the order of pstorage_register

im registering two p_storage modules, one allocatr 3 blocks of 16 bytes (so one page) and the other one 512kb ( 5 pages).

to my understanding, I called pstorage_register with param_1 first, then I called pstorage_register with param2. but I can ... (more)

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## Master control panel 3.10 does not work with segger jlink v 5.10l

Hi, I was seeing memory leak issues when using NRF51 with JLkink v4.98. See this link: http://forum.segger.com/index.php?pag... This issue has been fixed with the latest version of JLink 5.10. But when I ... (more)

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## DFU-OTA over BLE compatibility query: S110 and SDK version

In past, I was able to perform DFU-OTA over BLE transport for a custom board that has nRF51822QFAA (256kB main flash memory) SOC. I tested this functionality with Nordic's Android APP, nRF Toolbox and nRF MCP. Since then, I ... (more)

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## startup files error on MDK 5 for nrf51422

I started by compiling BLT uart app successfully on MDK5 but found out that it is giving errors on the startup files in the Device Pack.

I tried to refresh and update Device from pack installer but it fails to ... (more)

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## Why does Nordic increase the BLE MAC address by one, in DFU bootloader [closed]

Hello,

I have seen, that the BLE MAC is increased by one, in dfu_transport_update_start() (dfu_transport_ble.c). Can someone give me a short explanation, why this is done? The comment says: "Increase the BLE address by one when advertising openly." Isn ... (more)

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## Debugging problem on nrf51422 DK BLE app

I have successfully compiled BLE application using tutorials provided on nordic website. but when I start doing debugging for better understanding find out that I can not reset chip properly in debugging mode.

Later on I found that in project ... (more)

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## Weird problem: Softdevice is not booting up

Hi

I'm having a weird problem, at least according to my knowledge:

On first side, I have a NRF51822 QFAAH0, which I'm programming correctly with SD 7.0.0.

On the other side, I have a NRF51822 CEAAD2 ... (more)

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## Working / sample programs crashing on Custom Board?

Hi, I have made my custom board using nrf51422 sample chips (Which came nrf 51422DK ), but my working / sample program which works on DK gets crashed on custom Board.

Blinking works fine, but uart and other soft device programs crashes.

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## how to measure the coin cell battey voltage in real

main.c

Hello Everyone,

I am trying to measure the (3v)battery voltage by having proximity example as reference but intially it is showing 100percent later it is going to 13(percent) voltage approxmiatelry (after 120seconds) i dont understand why ... (more)

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## why app preserved data are lost after DFU

I configured the bootloader to preserve one page of data ( I configured #define DFU_APP_DATA_RESERVED 0x400 on the bootloader project

I also made the same thing with my project code

my userdata are located on the page above the bootlaoder (0x0003BC00 ... (more)

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## Why Vsupply measurement is inaccurate in nRF51?

Hello all, to optimize the BOM and size of our device(Tag based on nRF51822), the external divider was replaced by software configuration to measure the battery voltage. In our design the CR2032 cell was used and connected to nRF51 ... (more)

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## N550 default ANT bootloader ANT-WP

Hi,

I have just received a bunch of N550 modules and now I want to try and see if it is possible to update the firmware of these devices without using a JTAG.

If I understand the module correctly - these ... (more)

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## Enable auto discovery of symbols, include paths..etc

I've been trying to get SDK 10 and its new file structure up and running Eclipse. But its been an unfortunately slow and tedious process.

Following the Nordic Eclipse tutorial, I simply cannot get the Auto Discovery to work ... (more)

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## Capture the event of a sent scan response

Hi,

I am using the nRF52 Dev Kit.

Is there a way I can get a notification after a "scan response" has been sent?

For example - the first ble_on_radio_active_evt() after a BLE_GAP_EVT_SCAN_REQ_REPORT ?

Best regards,

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Hello

I have a problem with restarting advertising after disconnect event. There are two scenarios:

In this case everything works fine:

2. Device connects
3. Device disconnects (It sends Disconnect command)
4. I restart advertising in disconnect event

In this ... (more)

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## Connection via Unity - discovery of services

Hey,

We got a problem when trying to figure out how to detect the custom services from Unity. We are trying to read data and afterwards to do some manipulations of objects in Unity.

Any help would be deeply appreciated ... (more)

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## nRF51: is it possible to read the timer counter register?

Is it possible to directly read the timer module counter register in the nRF51?

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## sniffer with nRF52 and PCA10036

Hello, I would like to implement the sniffer on PCA10036 (I have two, they are no more useful with the latest SDK). I programmed the hex file from this post: link text

I works, but shows only the advertizing session ... (more)

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• Total users: 9594
• Latest user: Selina Bolinger
• Resolved questions: 5388
• Total questions: 11881

## Recent blog posts

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Posted 2016-02-13 08:46:43 by lisna
• ### Introducing an alternative API approach using C++

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• ### Building a BLE application step by step from scratch

Posted 2016-02-11 18:57:38 by Jocelyn Masserot
• ### Segger Embedded Studio - Cross Platform IDE w/ no Code Limit! (Mac OS X, Linux support) -- Revised

Posted 2016-02-04 12:51:53 by Michael Dietz

Posted 2016-02-04 05:09:41 by Daniel Veilleux

## Recent questions

Posted 2016-02-13 16:58:55 by kam618
• ### BTprofile selection

Posted 2016-02-13 14:45:57 by magesh vasudevan
• ### BLE question

Posted 2016-02-13 09:56:12 by rushin
• ### Co-channel collision

Posted 2016-02-13 03:29:23 by AndrewF
• ### NRF_ERROR_INVALID_STATE when Bonding and wanted to resend Notifications without writing to CCCD again

Posted 2016-02-13 03:09:32 by kkmoua