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# 895 questions

Tagged
• x
20
views
no
1

## 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)

4
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no
no

## 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)

7
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no
no

## 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)

37
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no
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## 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)

16
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## 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)

29
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1

## Concurrent Central/Peripheral UART

Hi,

I'am actually trying to develop a BLE based remote, with NRF52832, S132.

This remote must be configured by a smartphone (the remote act as peripheral) and be able to control one equipement (and act as Central).

As i ... (more)

14
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no

## msp430 through spi

Hi Sir,

I am working on nRF52832 board with pca10036 cortex M4, and i worked out spi master and slave example code on a same board and configuring spi instance 0 as master and spi instance 1 as slave in ... (more)

769
views
1
vote
1

## PDM microphone (02730A0019 or AKU242) electrical connection to nRF52832

Hi,

I am connecting the AKU242 straight to our microprocessor. It is a PDM interface so it has a SELECT, DATA, CLOCK, VDD and 5 GND signals. On the datasheet, there are two identical PDM microphones with one SELECT connected ... (more)

24
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1

## Possible bug in nfc_ble_pair_msg.c

SDK 13 Alpha

Lines 513-528 of nfc_ble_pair_msg.c read as follows:

if(ble_lesc_oob_data != NULL)
{
if((ble_lesc_oob_data->c != NULL) && (ble_lesc_oob_data->r != NULL))
{

return NRF_SUCCESS;
}

return NRF_ERROR_INVALID_STATE;
}
else
{
return NRF_ERROR_NULL ...
(more)

22
views
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1

## Most efficient/smart way of persisting characteristic values on nRF52

Hello, Can anyone help me figuring out the best possible way to store certain characteristics which I want to never reset values on the events of controller RESET or power cycle (OFF/ON). The only way to reset those characteristics ... (more)

21
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## Advertising current in nrf52832 increase-decrease at higher interval.

Currently I am facing strange issue in my project. Let me first highlight my set up. I am using the PCA10040 kit for development, keep multi-meter in series to measure current. Use"experimental_ble_app_eddystone" reference code of SDK 12.2.0 ... (more)

35
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no

## Intentional over-voltage on nRF52 I/O Pin?

Hi all --

I have an application where I have a LDO generating 2.6V from a single lithium-ion cell. It has an EN input that I want to expose to the nRF52 with a little RC circuit to allow the ... (more)

32
views
1
vote
2

## Printf only sends first byte and with an odd problem (52832)

    I am using example->peripheral->uart(KEIL version MDK 5) in SDK11.0 . Because my 52832 board is a new one I made, I changed RX_PIN_NUMBER and TX_PIN_NUMBER to 9 and 8. CTS_PIN and RTS_PIN are not connected, so I ...
(more)

17
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no
1

## nRF52832 SDK S132 UsageFault exception

Hi,

I want to implement handler for undefined instruction fault. According to Cortex M4 documentation (ARM DUI 0553A subchapter 2.3.2 "Exception types") this fault leads to UsageFault exception. There is a HardFault_process weak function in SDK (S132 version ... (more)

22
views
1
vote
1

## UICR vs external EEPROM (not write protected) for critical data? [closed]

Hello to all embedded jedi-masters out there!

I need your guidance.

I have a general product design question: I was wondering on what would be the best practice for storing critical product-related data:

1. The UICR registers of my nrf52832
2. An ...
(more)

9
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no
no

## ble_l2cap_conn.h header guard bug

SDK 13 Alpha

The header guard in serialization/connectivity/codecs/s132_s140/serializers/ble_l2cap_conn.h looks like this:

#ifndef BLE_L2CAP_CONN_H__
#define BLE_L2CAP_CON__H__


Note the change in spelling between the two lines. The second line should get an extra N instead of an underscore.

15
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no

## spi list feature without ppi

Hi,

I want to use spi list feature without ppi. Is that possible?

Because I have to use the same spi module for OLED, SPI flash and accelerometer with FIFO, spi ppi that I have to set spi tx and ... (more)

36
views
2
1

## experimental_ble_app_buttonless_dfu

nrf52832 sdk12.2.0 s132.3.1

Hello. Can't write properties after flash experimental_ble_app_buttonless_dfu example into chip. I can only enter into bootloader using button, but enter by enable notification and writing 1 to this service do not (I ... (more)

17
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no
no

## sd_flash_write inside BLE event [closed]

Hello, i have read if not all posts about writing to FLASH while using BLE. But could not find the desirable method.

What i would like to do is to write to flash from characteristic write as it comes. The ... (more)

24
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no
no

## Write to FLASH inside BLE event

Hello, i have read if not all posts about writing to FLASH while using BLE. But could not find the desirable method.

What i would like to do is to write to flash from characteristic write as it comes. The ... (more)

25
views
no
1

## change SCHED_MAX_EVENT_DATA_SIZE and device stall

I want to use app sched feature, so as example does, I call: static void scheduler_init(void) { APP_SCHED_INIT(SCHED_MAX_EVENT_DATA_SIZE, SCHED_QUEUE_SIZE); }

since I have my own event data, the max size is 9, so I changed the SCHED_MAX_EVENT_DATA_SIZE to 9, the ... (more)

30
views
no
1

## app_fifo wrapping problem

The app_fifo support e.g. in SDK 12.1.0, appears to have a serious problem when the read_pos/write_pos values wrap. i.e. when the fifo has been used over a period of time, regardless of the configured fifo ... (more)

46
views
2
1

## Is it possible to develop a normal connectable BLE device with beacon advertising?

Hi, I just want to know, Is it possible to develop a device that advertise normally and be connected by mobile, but the device must always send the eddystone-format advertising packet at the same time? In the other words, I ... (more)

117
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no
1

## Found a trouble with read back protect

using nrfjprog --rbp all and got a success

and using nrfjprog --readuicr got unavaible

but if using j-flash and read whole chip, it's able to be readback...

it only happens in

N52832

QFAAB0

1636CQ

tried 5 chips and all ... (more)

23
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no
no

## BLE HR C Example - Repeated BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION

Hi,

I am attempting to run the examples of BLE HRS C and BLE HRS Peripherals from the SDK. Getting to the connected state works (discovery and notifications as well) just fine. But the two seem to always disconnect after ... (more)

10
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no

## Is it possible to develop a device that always broadcast beacon packet? [closed]

Hi, I just want to know, Is it possible to develop a device that advertise normally and be connected by mobile, but the device must always send the eddystone-format advertising packet at the same time? In the other words, I ... (more)

49
views
no
1

## nRF52 s132 antenna steering

Hello, recently I've been going through SDK v12.2 and board documentation but I can't find any info about choosing which of board's antenna to use. Simply, I'd like to know if I can send for ... (more)

28
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no

## Scan and identify BLE Beacon using UUID

Hello! I'm a new user to NordicSemi and I'm currently working on a project where one nRF52 DK is a beacon and another nRF52 DK is an observer. The observer is supposed to listen for advertisements and recognize ... (more)

44
views
no
1

## Possible bug in gatts_cache_manager?

In the nRF5 SKD alpha, gatts_cache_manager.c:123 looks like this:

        gscm_evt.params.sc_state_stored.state = &peer_data.p_service_changed_pending;


Is this supposed to be using a dereference operator (*) instead of an address-of (&)? peer_data is a struct, p_service_changed_pending is a bool pointer, and ... (more)

28
views
1
vote
1

## app_button library event fired on release [closed]

Hey, I recently got the nrf52 DK and tried to make use of the app_button library to have easy to use debouncing. As far as I understood the library, the event should be fired when the button is pressed. The ... (more)

#### Statistics

• Total users: 16311
• Latest user: tristanubnt
• Resolved questions: 8512
• Unanswered questions: 2249
• Total questions: 19842

## Recent blog posts

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• ### New NFC feature on nRF52 Series: Read/write capable Type 4 Tag NFC library in nRF5 SDK.

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• ### Simple Application-level Authentication

Posted 2017-01-30 12:34:01 by Daniel Veilleux
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Posted 2017-02-01 01:12:03 by Mason Lee

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