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19,842 questions

2
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Last activity 2017-02-20 03:43:55 +0100 by Jackson

nrf connect indicate subscribe

When I connect to my firmware after cycling Bluetooth on iOS, I am able to subscribe to my Characteristic Indications without any issues. The nRF connect app receives all my my value indications.

After disconnecting, subscribing a second time doesn ... (more)

5
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no
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no
answers
Last activity 2017-02-20 02:53:04 +0100 by TFETT

Buttonless DFU - Transfer Succeeds, but no BLE device available after

I'm working the the NRf52 dev board and SDK12.2. I was able to successfully load the standard DFU example and then use the NRF Toolbox on an android to load the example HR zip file to the device ... (more)

65
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no
votes
3
answers
Last activity 2017-02-20 00:02:10 +0100 by Roger Clark

can i program nrf51822 bt module using uart

Hi,

I am facing some problem with openocd and stlink connection.

I saw some dve. boards having USB<->serial converter on board for programming (i guess).

So, i got following board.

image description

24
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no
votes
1
answer
Last activity 2017-02-19 21:17:01 +0100 by run_ar

Radio can not work inside timeslot handler

I'm trying to transmit a radio signal inside time slot handler, the code is like:

  switch (signal_type) 
     case NRF_RADIO_CALLBACK_SIGNAL_TYPE_START:
         radio_configure();
         NRF_RADIO->EVENTS_READY =   0;
         NRF_RADIO->TASKS_TXEN     =   1;
         while (NRF_RADIO->EVENTS_READY == 0U)
         {
         }

However, the code is stopped inside the "while(.)" loop ... (more)

28
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1
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answers
Last activity 2017-02-19 11:20:18 +0100 by Roger Clark

nRF52840 USB power ???

Could someone explain how to power the nRF52840 via USB?

Looking at the schematics, and also reading the "objective" spec, I can see that VBUS is connected to the USB input bus voltage, and this voltage seems to be used ... (more)

7
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answers
Last activity 2017-02-19 10:40:52 +0100 by Erol

One RX and Three TX system with NRF24L01+

This system does not work if I enable the third Pipe (Pipe2) . The system is working without any problem as one RX and two TX (Pipe0 and Pipe1). The problem on enabling Pipe2. According to the data sheet the Pipe2 ... (more)

20
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no
votes
1
answer
Last activity 2017-02-19 20:51:00 +0100 by run_ar

Change GAP parameters dynamically over a short period

Hi,

I need to be able to change the GAP parameters of my connection for only a short period of time to save battery life but have high throughput when I need it. My firmware will only need to send ... (more)

10
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answers
Last activity 2017-02-19 08:17:51 +0100 by Darren Beckwith flag of Canada

nRFDK Shield Detect

I am considering build some of my own shields to interface with the nRF52DK for the 832 and 840. I am curious how I should use header P5 with the shield detect pin. Should my shield pull this pin low?

Thanks, Darren

12
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no
votes
1
answer
Last activity 2017-02-19 20:45:32 +0100 by run_ar

nRF Connect IOS 8.4.1

I'm working with nrf52832 dev board. I used nRF Connect app for IOS but my phone run on IOS8.4.1, so i can't get it from apple appstore. Someone can help me by give version that i ... (more)

4
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answers
Last activity 2017-02-19 03:11:39 +0100 by Sven

Eclipse CDT debug and NVIC registers

I'm using Eclipse CDT for debugging according to the tutorial on this site. I've installed the device pack and I do see the nRF52 peripherals in the debug view. However all the general ARM Cortex-M4 peripherals are missing ... (more)

23
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1
vote
1
answer
Last activity 2017-02-19 03:08:34 +0100 by RK flag of Singapore

Precision of TIMER1

Hi there,

I'm using nrf51822 timer1 as the timer for some time-critical task, and I'd like to ask two questions about it:

  1. What's the precision of Timer1 if the internal 256K clock is used?

  2. If some instructions ...

(more)

5
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answers
Last activity 2017-02-19 00:01:00 +0100 by Robert Massaioli

ADC / PPI: SDK v11.0.0 works but v12.2.0 does not

I was building my own custom application that connects a nrf_drv_timer to an ADC start trigger using PPI on an nRF51822 and I could not get it to work. I asked a previous question about it here. This is a ... (more)

16
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answers
Last activity 2017-02-18 21:10:11 +0100 by JimInCA

Gazell host with multiple devices

I'm new to Gazell, so please excuse the simplicity of my question, but I just seem to be missing something.

I have an application where I will be using one host with two devices. When the host receives a ... (more)

21
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answers
Last activity 2017-02-18 19:58:49 +0100 by hamster66 flag of Ukraine

RAM read on 51822

Hi. Faced with a strange situation. Example. All look good when I read code area:

void ex1 (void)
{
 uint32_t *addr_out;
 uint32_t i,word;

   addr_out=(uint32_t *)0x0000000UL;

     for (i=0;i<5;i++,addr_out++)
        {
        word=*addr_out;
                NRF_LOG_INFO("addr %x, word %x ...
(more)

17
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no
answers
Last activity 2017-02-18 17:56:27 +0100 by Biketap

NRF52 development kit does not power up

Hello,

I have been using the development kit for more than a month when after one flashing, the LED 5 on the board started blinking at one second intervals and the board froze. After unplugging from the USB and plugging ... (more)

46
views
1
vote
2
answers
Last activity 2017-02-18 16:20:53 +0100 by Wojtek flag of Poland

Full sdk_config.h somewhere?

Using SDK v12.2.0. Starting a new project with Segger Embedded Studio, I have to assemble an sdk_config.h file. For example when using GPIOTE I first need to find an example project that uses it and extract the ... (more)

13
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no
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no
answers
Last activity 2017-02-18 13:00:44 +0100 by Azmath

Linker Error Undefined reference to 'something'

I am trying to get nRF52832 working with Segger Embedded Studio. All the examples happily compile and load and run on the board.

But, I want to write my own basic hello world from scratch. So I got the most ... (more)

36
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no
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no
answers
Last activity 2017-02-18 12:46:28 +0100 by HarshD

How to log data in Hexadecimal format over nRF Toolbox(UART) android application

Hi,

I'm working on accelerometer + BLE application. My current configurations are nrf51822 and LIS3dh accelerometer chip, Protocol TWI, Softdevice 110, BLE service type is ble_nus_init_t, Android application is UART sub app in nRF Toolbox. At this stage, I can ... (more)

10
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no
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no
answers
Last activity 2017-02-18 09:09:39 +0100 by Louis Lu

Blink questio what are those file do.

Hello, I am new to NRF. and actually i dont have other MCU experience, beside adrduino. my question is not about BLE/BLE+, it's more about how to use NRF5283 in keil question.

I did comple the blynk example ... (more)

9
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no
votes
no
answers
Last activity 2017-02-18 08:24:42 +0100 by Erol

NRF24L01+ one RX and two or more TX

I am working one one star network system with NRF24L01+. I got success with one pair (Single TX and Single RX) on communicating. But I could not get any positive result for three TX and one RX. I read may ... (more)

6
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no
votes
no
answers
Last activity 2017-02-18 06:40:31 +0100 by Murugan

GPIO interrupt with Proximitty example

Dear Nordic Team,

Thanks for supporting.

currently i am try to interface MMA8453 accelerator with ble proximitty example .Already i have interfaced peripheral example code its working good. But in ble proximitty example code not work because i want to ... (more)

7
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no
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answers
Last activity 2017-02-18 06:35:31 +0100 by Stanley

app_twi with EasyDMA

Hi, I want to control a g-sensor by nRF52832 via i2c.

I am using an example( nRF5_SDK_12.2.0\examples\ble_peripheral\ble_app_uart\pca10040\s132\arm4) and I add the app_twi into the project.

In the sdk_config.h, I set TWI0_ENABLED ... (more)

69
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answers
Last activity 2017-02-18 06:13:20 +0100 by Summit

How to debug example pwm_driver? I tried to build debug version make debug but there is no "debug" in make. [closed]

Dear Nordic Engineer,

I need to work on nRF52, my Macbook Air has OSX Yosemite 10.10.5 - I can run "make" or "nrfjprog" only if I copied libjlinkarm.dylib into the same folder that I execute the make or ... (more)

29
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2
votes
1
answer
Last activity 2017-02-19 08:07:03 +0100 by karthik

GPIOTE interrupt count

Hi

I am using nRF51822 (pca10001).I am unable to discover my device. I used the ble_app_template_s130_pca10028 as my base and added the code for gpiote handler as following.

static void gpiote_event_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)

{

int32_t count = 0;
count ...
(more)

14
views
no
votes
no
answers
Last activity 2017-02-18 00:39:09 +0100 by jtaylor306

NRF52 no emulator connected

I've been through the tutorial of connecting the NRD52 board to my PC, but my PC isnt recognizing it at all. No pop up for any usb devices. I've tried different cables and about 7 different computers, some ... (more)

16
views
no
votes
1
answer
Last activity 2017-02-17 20:36:58 +0100 by Bill Saltzstein

S132 central find service with 128bit uuid

Hi, I'm trying to modify one of the examples (the hrs_relay) to find my custom service to identify the device uniquely. I know I need to add the 128bit uuid using and then use that handle, but am getting ... (more)

12
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no
votes
no
answers
Last activity 2017-02-17 18:35:58 +0100 by vit bernatik

SPI Init triggers old NRF_SPIM_EVENT_END

Hello, We are sharing SPI and we found possible bug in nrf_drv_spi....

The problem was that first SPI is using blocking SPI thus does not use ISR and set it to NULL:

nrf_drv_spi_init(&spi, &spi_config, NULL)

Then I try to ... (more)

37
views
no
votes
1
answer
Last activity 2017-02-17 22:57:34 +0100 by Roger Clark

Windows BLE Compatibilty

I made a BLE peripheral (nRF52 + SDK11.0.0 + s132) and have so far been using Android devices (that supports 7.5ms connection events) to connect to it. I want to connect to a PC now and support various Windows ... (more)

18
views
no
votes
no
answers
Last activity 2017-02-17 16:07:43 +0100 by Braver

Possible SPI master bug when using DMA

Hello,

I've been implementing DAC control trough SPI and DMA using the NRF52 and it is working nicely. During development however I encountered what i think is a bug in the SPI master driver. It occurs when calling the ... (more)

19
views
1
vote
1
answer
Last activity 2017-02-17 15:12:32 +0100 by Definitely Confused

Reject when whitelist empty

Is there a way to reject requests when the whitelist is empty? I support clearing out the whitelist, but after clearing out the whitelist I would still like to reject connection requests. Is there a way I can do this ... (more)

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