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Last activity 2017-05-19 11:49:31 +0200 by khosla

time synchronization across different nodes in a mesh network, single hop as well as multi hop.

I am working on time synchronizations between different nodes in a mesh network. I have earlier worked on the radio and the ppi examples given. I wish to generate time stamps at each send and receive events between two different ... (more)

87
views
1
vote
1
answer
Last activity 2017-05-09 07:26:31 +0200 by LovejoySteph

FCC Certification /Digital modulation minimum bandwitdth

Hi all,

Our company is in the process of certifying a device. This device is using a nrf52832 with radio.

We had no problem to comply with the ETSI standard, but things didn't go as expected for FCC certification ... (more)

109
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no
votes
2
answers
Last activity 2017-05-03 22:08:36 +0200 by kellac1

RADIO ramp-up - what registers (if any) are latched?

I am trying to send lots of data through radio (basing on old micro esb project from github, but heavily modified). I need to keep radio IDLE (not DISABLED) when not transmitting, because ramp-up time sometimes is too long and ... (more)

60
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1
vote
1
answer
Last activity 2017-04-04 19:55:23 +0200 by micallef25

NRF52 radio Tx to Rx

Hello,

I am running a simple application where I would like to listen for BLE packets for 100ms and then transmit a packet. (no soft device) I can successfully capture BLE packets but I am not transmitting any messages.

When ... (more)

102
views
no
votes
1
answer
Last activity 2017-03-22 03:28:51 +0200 by uba

Modulation by radio_test_example

I use radio test example in SDK 12.2.0.

Is it possible to perform modulation with PRBS9?

35
views
1
vote
1
answer
Last activity 2017-03-20 16:07:53 +0200 by Tgage

ESB Peripheral Question

I have set up some code using the ESB example in SDK v12.2.0 I and am able to transmit and receive packets between two nrf51 dongles, with no issues. However, when I program a custom PCB that has ... (more)

61
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no
votes
1
answer
Last activity 2017-03-16 13:24:39 +0200 by Kristin flag of Norway

radio receive in timeslot API

I am using nrf51822(pca10028)

i used the timeslot API tutorial in devzone..and it worked fine but i want to integrate the radio receiver example along with this.

nrf_radio_signal_callback_return_param_t * radio_callback(uint8_t signal_type) { switch(signal_type) { case NRF_RADIO_CALLBACK_SIGNAL_TYPE_START: //Start of the ... (more)

57
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no
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no
answers
Last activity 2017-03-09 13:28:57 +0200 by karthik

advertising packets received using radio receiver example

hi

i am using nrf51822. i used the radio tranceiver example and it works well. I am planning to advertise the received packets so that the range can also be increased and viewed in nRF connect android app

int main ... (more)

51
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1
vote
1
answer
Last activity 2017-03-07 19:51:18 +0200 by Erlend

IRQ Handler for Radio - not entered

I'm trying to enable interrupt for radio events.

I have this code in main:

bsp_board_leds_init();
(...)
NRF_RADIO->INTENSET = 1 << RADIO_INTENSET_READY_Pos;
NRF_RADIO->TASKS_TXEN = 1;
while(1) {}

And I have defined this function:

void RADIO_IRQHandler(void) {
  bsp_board_led_invert(LED_2);
  int a = 0;
}

The ... (more)

45
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1
vote
no
answers
Last activity 2017-03-03 23:04:45 +0200 by Tarik

application stops at sd_nvic_EnableIRQ(SWI2_IRQn)

Hi, My application always stops at the end of ble_stack_init() exactly at:

return sd_nvic_EnableIRQ(SWI2_IRQn);

of the function softdevice_handler_init.

My board does not have a low frequency external oscillator this is why my clock source is set to "NRF_CLOCK_LFCLKSRC_RC_250_PPM_4000MS_CALIBRATION"

70
views
no
votes
1
answer
Last activity 2017-03-01 16:54:16 +0200 by Torbjørn Øvrebekk

When is CRC status valid?

When is the CRCStatus register valid in the RADIO peripheral? Is it set when the radio leaves RX mode or only after the END event?

71
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no
votes
1
answer
Last activity 2017-03-01 16:52:17 +0200 by Torbjørn Øvrebekk

About the radio mode of nRF52832

The radio mode 250Kbps is removed from nRF52832. However, by our test, nRF52832 radio can still work with radio mode 250Kbps with setting

NRF_RADIO->MODE = (RADIO_MODE_MODE_Nrf_250Kbit << RADIO_MODE_MODE_Pos);

and receive/send packet to nRF51822 in 250Kbps radio mode.

For nRF51822, the ... (more)

36
views
1
vote
1
answer
Last activity 2017-03-01 16:30:03 +0200 by Torbjørn Øvrebekk

nRF52 radio bit counter

Hello, recently I've found an information about bit counter in Radio Module in nRF52 Product Specification. Unfortunatelly I can't find any reference at infocenter how to use it, neither can I find any example in the Internet or ... (more)

88
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no
votes
1
answer
Last activity 2017-03-01 13:44:16 +0200 by run_ar

Reading radio background noise level using nRF51 or nRF52

Hi,

I need to monitor radio channels and find the best one (with lower background noise) to use.
Is there any way to measure radio signal level in a particular frequency on nRF51 or nRF52? I'm looking for somthing ...
(more)

124
views
2
votes
1
answer
Last activity 2017-03-01 09:25:23 +0200 by Kristin flag of Norway

DTM or Radio Test

Hello! I need to perform some radio tests on a board that contains an nRF52 SoC. The nRF5 SDK provides two ways of performing such tests, either using DTM, as specified by Bluetooth SIG, or using the Radio Test example ... (more)

88
views
2
votes
1
answer
Last activity 2017-02-24 16:54:01 +0200 by AmbystomaLabs

Radio: frequency deviation & drift, vs Bluetooth requirements

I have a couple of questions regarding Radio transmission for BLE.

1) Is the radio driven by one of the HFCLKs? If so, it confuses me how a 16M clock can drive/derive a much faster 2.4 GHz radio ... (more)

68
views
no
votes
1
answer
Last activity 2017-02-23 15:15:29 +0200 by Erlend

LSByte first in radio payload field?

Reading the nRF51 RM. On page 82 there is this:

a

But it doesn't make sense to me to talk about the LSByte of the PAYLOAD field, as it's just arbitrary data, and the Radio specs are agnostic of ... (more)

162
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2
votes
1
answer
Last activity 2017-02-23 14:24:54 +0200 by Paddy

What could make nRF52840 radio hang in TXDISABLE state?

I have a very simple test program to run the radio through the transmit sequence, each task is called from the radio interrupt handler according to each event. The process works correctly through the sequence (disabled>txru>txidle>tx>txidle ... (more)

96
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no
votes
no
answers
Last activity 2017-01-16 14:39:16 +0200 by Nicolas Besson

nrf52 radio and stack crash

I'm developing a device based on an nrf52 chipset, and I'm experiencing strange behaving of the Radio interface. The firmware is based on SDK v11 and SoftDevice 132, the hardware design is close to the reference design. I ... (more)

231
views
no
votes
1
answer
Last activity 2017-01-04 13:37:57 +0200 by Kristin flag of Norway

radio test example and button handle

Hello, I want to change mode from radio test example from button input. How can I use the gpiote for mode change from button input. I only want to use modulated and unmodulated certain fixed channel. Thank you.

128
views
no
votes
1
answer
Last activity 2016-12-19 14:55:06 +0200 by Hung Bui

Errata 138 - Spurious emission on GPIO exceeds limits in radiated tests

Hi, I'm not sure if I understand the new reference layout correctly. There are new NP0 12pF capacitors on pin 25 and pin 26 to suppress the spurious emission, but are they always needed or only if these pins ... (more)

141
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1
vote
1
answer
Last activity 2016-12-05 10:47:42 +0200 by Bjørn Spockeli flag of Norway

DC/DC current consumption

Good morning Nordic team,

I was measuring the nRF52832 chip in DC/DC mode. Everything went just as expected. Now I was looking at the current consumption when the radio is off and it resulted in just 3 µA. But ... (more)

529
views
2
votes
no
answers
Last activity 2016-12-01 08:00:08 +0200 by liron

NRF52 GPIO located near the radio

Its stated in the Product Spec that one shouldn't place high frequency or high sink/source IO at GPIOs 22-31. My question is what is considered as high frequency for that manner?

In my case, one of these IO ... (more)

91
views
1
vote
no
answers
Last activity 2016-12-01 07:39:01 +0200 by max

nRF52832 WLCSP Radio problem

We build our own board with nRF52832 and have problem with radio. nrf52 Schema

We start with sdk12 ble_hid_keyboard project. I disabled scheduler ,start advertisement and toggle 2 IOs(P0.26,P0.25) on the main loop without power manage ... (more)

93
views
1
vote
1
answer
Last activity 2016-09-20 09:36:27 +0200 by Einar Thorsrud flag of Norway

ESB radio maximum channel number?

The manuals for the nRF51 and nRF52 list the maximum ESB radio channel number as 100, but in the SDK the guard value in the set channel function is <= 125

(in both the older SDK's using micro_esb.c, and ... (more)

500
views
no
votes
1
answer
Last activity 2016-09-07 16:07:11 +0200 by Stefan Birnir Sverrisson flag of Iceland

Is the "NRF_POWER->DCDCEN" equal to to "sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE)" ?

Hi, Nordic:

I'm testing the DC/DC function as to reduce the radio current. I have done the DC/DC test using pca10028 DK with the code below (SD v2.0.1, SDK11) :

void main(void)

{

 NRF_POWER->DCDCEN = 1 ...
(more)

317
views
2
votes
1
answer
Last activity 2016-08-18 21:10:20 +0200 by CurtisHx

Radio frequency change

Hello,

I'm developing proprietary radio protocol using nRF52 (not using softdevice) and would like to know if it is allowed to write NRF_RADIO->FREQUENCY register while radio is transmitting or receiving? What happens if NRF_RADIO->FREQUENCY is modified during ... (more)

36
views
2
votes
1
answer
Last activity 2016-06-29 11:35:42 +0200 by Terje Schjelderup flag of Norway

TXADDRESS Values?

Reading the documentation Address config it is clear how to use RXADDRESSES, could you please explain how to use TXADDRESS ?

As of TXADDRESS there are 3 bits available for the configuration, how are these used?

Is this just a selector ... (more)

87
views
1
vote
1
answer
Last activity 2016-06-27 11:33:04 +0200 by Øyvind Karlsen flag of Norway

Are there any initializations I need for my custom radio if I'm including timeslot with bluetooth?

I looked at the radio project in the peripheral folder on SDK5 11. I managed to get a custom radio project that works well with my device. A brief on my project, I set up a GPIOTE input event and ... (more)

229
views
2
votes
2
answers
Last activity 2016-06-24 08:33:43 +0200 by Øyvind Karlsen flag of Norway

Radio Notifications become inverted

If I have a high-priority interrupt (or a series of them) that runs long enough to completely mask a radio notification, then all further radio notifications appear inverted. Program architecture aside, is there any way I can definitely tell whether ... (more)

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