# 8,983 questions

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## What would be the reason for not getting bluetooth signal from nRF51822?

Hi All,

I have been developing a bluetooth chip based on nRF51822 QFAC. I have followed the design rules very closely but at the end I do not get any bluetooth signal coming from the Johanson antenna (2450AT18A100). I use ... (more)

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## Can an STLINK be used with nRFgo Studio?

The JLINK is costs hundreds of dollars, the STLINK is less thank \$20 USD (available on ST's Discovery boards). I would really prefer to use the STLINK. Is there a way to program the SoftDevice and the Application without ... (more)

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## S110 v7.3.0 - problems with CEAA chip

Hello, i have bought nRF51822 pcb module on Aliexpress (nRF51822 CEAA chip HWID 006A, 16Mhz crystal) and I'm trying to test it with SDK 6.1.0 and S110 v. 7.3.0 (as compatibility matrix recommends for revision ... (more)

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Please can any one tell me from where I can get this programmer? Nordic have stopped selling development boards in which we can get the programmer. I think this could be a major draw back for all developer using Nordic chip.

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## nRF24L01+ missing ACKs

I have two nRF24L01+, one as PTX and one as PRX. Both have following config: EN_RXADDR = ERX_P0, EN_AA = ENAA_P0, RF_CH = 100, RF_SETUP = 0x26, SETUP_RETR = 0xF0, SETUP_AW = 1, RX_ADDR_P0 = 0xAB 0xCD 0x00, TX_ADDR = 0xAB 0xCD 0x00, RX_PW_P0 = 8. All packets are ... (more)

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## Interrupt when Signal is low-to-high

I have a project, where I try to trigger an interrupt when I get a low-to-high tranistion and high-to low transition.

My setup:

-nRF51DK

-SDK8.1

-SoftDevice 8.0

#define low_to_high                25
#define high_to_low                28


Both are defined as inputs ... (more)

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## How to find nrf.exe [closed]

Hi,everybody！ When i install master control panel 3.10.0.14, i can't find nrf.exe in " C:\Program Files\Nordic Semiconductor\Master Control Panel\3.10.0.14\nrf ". Only nrfutil.exe. What should i do, thanks.

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## nRF51-dk no longer mounting

Hi,

I've been using the nRF51 dev kit, and today it stopped mounting when I plug it in. It doesn't show up as MBED or BOOTLOADER.

I use both Mac OS X and Windows, though all work in ... (more)

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## maximum interrupt frequency? GPIO vs GPIOTE

Hi folks,

What's the maximum interrupt frequency the nRF51822 can support? I am looking to do an interrupt burst of about 4000 interrupts at a rate 2MHZ or 4MHz. In the ISR, I just want to read 8 GPIO ... (more)

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## Problem setting up Eclipse for NRF52

Hello, I have been trying to setup eclipse for the NRF52 off and on all week. I followed the guide on setting up eclipse for the NRF51 and adapted it for the NRF52.

I've finally gotten really close but ... (more)

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## Generate two PWM waves with delay in nRF51822

I want to generate 2 fast PWM waves with 25% duty cycles from nRF51822. They have same frequency of 4MHz but there is half a cycle delay between them. I checked the nrf_pwm library but couldn't find a function ... (more)

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## Data acquisition on a 2MHz clock

Hi folks,

I have a 2MHz clock (call it DRDY) coming into my nRF51 on one of the GPIO pins (call it AFE_DRDY). I need to read an external AFE chip on every falling edge. So, I thought I would ... (more)

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## BLE security

Hello,

Using BLE Scanner app (available for Android), i'm able to change the device name. I can also write other values for each characteristic.

How can we protect a BLE Network from Writing ? (Read only)

Thanks.

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## Calling TWI driver from multiple files using nrf_drv_twi

Hi, I use nrf51822 with SDK8.1, S110 and gcc with Makefile. I want to use nrf_drv_twi in both my main “.c” file as well as a library “.c” file that is included in the build. So in my main ... (more)

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## NRF8001 Problems

Hi,

I am trying to get the NRF8001 rev. C chip working with a Tiva Lauchpad (TM4C123GXL) board. I modified the original Arduino SDK for use with Energia. I am using the nrfToolbox app for Windows Phone 8.1.

Problem ... (more)

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## In sleep mode the current consumption is 0.98mA, with only GPIOTE enable

Hello, My question is that in sleep mode my nrf51822 current consumption is 0.98mA, with only GPIOTE enable, however when I disable it, the current falls to 13uA, but the issue is that, I want my nrf51822 to be ... (more)

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## Are others experiencing issues with Anrdoid MCP buttonless DFU?

I was upset early this afternoon because I was experiencing issues with buttonless DFU on Android. As is usually the case, I assumed it was my fault.

First, I reverted to old known working firmware/bootloader combinations. This was unsuccessful ... (more)

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## Best suitable IC for FOB Key

Hi,

I want to develop one FOB key which will be in TX mode only to transmit a key continuously or at specified interval at ultra low power mode and powered by CR2032 coin cell with no any key.

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## J-link and custom board, "no device detected" in nRFgo

Hi,

I have designed a custom board with nRF51822 but when I connect the custom board and j-link with an adapter the program nRFgo can't detect the chip.

When I conenct nRF51 DK debug IN with j-link, the program ... (more)

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## [nrf_gpio/app_gpiote/nrf_drv_gpiote]

Hello Nordic,

I am following example code [--ble-app-lbs-master] for my application in (keil4.6/sdk8.0.0). Its already consisting (app_gpiote), but I want to add some code module which refer (nrf_drv_gpiote). Is it compulsory to use both files or ... (more)

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https://devzone.nordicsemi.com/questi...

Is it really necessary to buy a Dev Kit?

Isn't it possible to obtain a Key without a Dev Kit?

How does the "Bluetooth low ... (more)

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## Identify Device Based on Advertising Data

I am connecting to two identical devices, but one is configured as device 'A' and the other is device 'B'. I am currently advertising whether the device is configured as A or B, and am able to connect to them ... (more)

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My set Up: TI as Peripheral, Android as Central, Nordic as Central

Using Andriod as central, I am successfully able to scan for the peripheral doing directed advertisement, and also able ... (more)

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## No services discovery with Master Control Panel on android 5.0

We are currently developing an Android app (5.0) supporting the peripheral mode and communicating with the Master Control Panel (v3.7.1).

The connection to the Android smartphone is well established but the Master Control fails to make the ... (more)

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## S130 potential unstability case

This code do a test triangle with 3 boards on mbed (using BLE API). I have digged in BLE_API and it looks like if instability was in S130. Have you this kind of test in internal ?

I want to help ... (more)

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Hello,I modified ble_app_multilink_central and now I can connect to a beacon module.After I connect to the beacon,I receive notification data from this.When beacon send notification data to central with approx 0.5 kbytes/secon evrything is ... (more)

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## I am unable dot get ble dfu bootload to work with and soft device other than s130

I have built the dfu_dual_bank_ble_s110_pca10028 project and attempted to load the ble_app_hrs_s110with_dfu_pca10028 application. I did find that if the use the S130 softdevice the download worked. The application does not run after down load because it is built for the ... (more)

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## Enable to create a wakeup button on central multilink example

I'm trying to implement a wake-up button on central multilink example. I.e, i need to implement the app_button in order to wake up from sd_evt_wat() function. The problem is when I add this characteristic on buttons_init,

uint32_t err_code ... (more)

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## CE certification

Hi. We are going to mass production now and the 3rd party lab that will certify our product says we need to have a special mode in the firmware that would do :

continuous emission, reception, emission on a low, a ... (more)

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## Licence questions

Hello,

I've noticed that it is quite hard to set up an Eclipse development environment and I want to try to make a package of everything that is needed for developing with my mesh.

Would it be possible to ... (more)

#### Statistics

• Total users: 5841
• Latest user: eozy
• Resolved questions: 4227
• Total questions: 8983

## Recent blog posts

• ### Nordic's infocenter

Posted 2015-08-24 15:55:30 by Oisin
• ### nRF51822 now supports extended industrial temp range (-40 – 105C)

Posted 2015-08-24 08:06:05 by Pär Håkansson
• ### FruityMesh open sourced - Connection based meshing that will run on batteries

Posted 2015-08-12 18:47:00 by Marius Heil
• ### Running micro-ESB concurrently with BLE

Posted 2015-08-14 19:36:27 by Audun
• ### Developing Nordic nRF51 Projects with Visual Studio

Posted 2015-08-06 06:14:59 by ivan

## Recent questions

• ### What would be the reason for not getting bluetooth signal from nRF51822?

Posted 2015-08-29 21:40:22 by eozy
• ### nRF24L01+ missing ACKs

Posted 2015-08-29 10:39:48 by Milek7
• ### How to find nrf.exe

Posted 2015-08-29 09:52:03 by WYL
• ### nRF51-dk no longer mounting

Posted 2015-08-29 09:14:57 by USCRyan
• ### maximum interrupt frequency? GPIO vs GPIOTE

Posted 2015-08-29 06:57:59 by ujwal