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Last activity 2017-09-09 12:15:41 +0200 by endnode

RTC wake up not happening in system-off mode

Hi,

We are using system-off mode to save power in our device which uses nrf51822 chip. Our application requires regular wake-ups using RTC interrupts.

But the wake up is not happening since RTC is also off during system-off mode.

  1. Any ...
(more)

501
views
no
votes
2
answers
Last activity 2017-08-23 14:42:41 +0200 by Stian flag of Norway

nrf52840 Power Consumption

Hi There,

I am doing current measurements on the nrf52840 in sleep mode with no RAM retention and I am getting different values based on how I take the measurements. Please see the various methods and resulted below.

  1. Using an ...

(more)

73
views
1
vote
1
answer
Last activity 2017-08-14 07:58:46 +0200 by RohanKadam

Problem with system off mode and stopping advertisement [closed]

Hi,

Most of the sections of my application are functioning as I want it to, except these two (step 3 and step 4).

Application:

  1. Connect device (with Auto connect enabled)
  2. Transfer data using nus service from peripheral to central device ...
(more)

96
views
1
vote
1
answer
Last activity 2017-05-18 12:26:56 +0200 by Bjørn Spockeli flag of Norway

Minimum pulse length to detect low level with GPIO SENSE for nRF52

Hi all

What is the minimum required length of a LOW pulse to be detected by the nRF52832 via GPIO SENSE mechanism? I couldn't find it in the product specification.

I want to wakeup the nRF with a LOW ... (more)

1k
views
no
votes
2
answers
Last activity 2017-02-21 14:46:29 +0200 by Jørgen Holmefjord flag of Norway

Configuration of GPIO to wake up from System Off

Hi,

I am working with a nrf51822 and I have seen that the way to wake up from System Off mode is by a GPIO interrupt. I wanted to know if it is needed to configure previously the GPIO pin ... (more)

662
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1
vote
1
answer
Last activity 2016-11-07 16:25:51 +0200 by Petter Myhre flag of Norway

nRF51822 Sleep modes

Hi All,

My question is about available sleep modes in nRF51822.

As I can find in nRF51 Series Reference Manual, and Product Specification documents, nRF51822 chip has two essential sleep modes, System-ON and System-OFF. Where the System-OFF is the deepest ... (more)

459
views
2
votes
1
answer
Last activity 2016-11-04 09:28:43 +0200 by Aryan flag of Norway

Set 2 pins to wakeup from System ON and OFF, and know which pin was pressed

I want to configure two pins to be able to wake up both from System ON and OFF and know which pin was pressed

is it possible?

157
views
no
votes
no
answers
Last activity 2016-10-17 02:52:54 +0100 by uba

from system on to system off

I am using the nRF5_SDK_11.0.0.

I want to state of the system off sleep after entering system on sleep.

For example, from the state of system on sleep, it becomes system off sleep after 5 seconds.

However, it ... (more)

507
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1
vote
1
answer
Last activity 2016-10-14 14:05:27 +0100 by Ole Bauck flag of Norway

Problem with emulated System OFF mode with NRF52

Hi all

I have two questions/problems regarding the emulated System OFF mode with the NRF52832 and the SoftDevice S132 V2.0.1:

  1. According to this thread, an infinite loop should be placed after the function call sd_power_system_off() when debugging ...
(more)

125
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no
votes
1
answer
Last activity 2016-08-12 13:50:09 +0100 by Stefan Birnir Sverrisson flag of Iceland

"Switching off" nRF51 beacon

I'm using a nRF51 beacon as a receiver that produces a pulse when it receives a byte from the transmitter. The code is based on the ble_app_uart example. And I set the connection interval to minimum to minimise the ... (more)

174
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no
votes
1
answer
Last activity 2016-03-31 08:00:03 +0100 by Petter Myhre flag of Norway

do not enter the system off mode in hrs

I'm using [nRF52_SDK_0.9.2] and original module. As a tool, I use the keil.

"NRF_POWER-> SYSTEMOFF = 1;" in the SDK example hrs also written, does not enter the system off mode (current value does not decrease).Written location ... (more)

556
views
1
vote
1
answer
Last activity 2015-11-03 11:08:12 +0200 by andlier

Why GPIO can be used as power supply pin?

Hi all,

I am new in nRF51822. Today I am doing experiment using GPIO and radio transmission. I wrote a very simple code as below:

int main(void) {

init_clock();
radio_configure();
transmit();
nrf_gpio_cfg_sense_input(8, NRF_GPIO_PIN_PULLDOWN, NRF_GPIO_PIN_SENSE_HIGH);
NRF_POWER->SYSTEMOFF = 1;

}

The first ... (more)

677
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no
votes
1
answer
Last activity 2015-07-08 13:56:32 +0200 by Stefan Birnir Sverrisson flag of Iceland

nRF51822 with 32MHz crystal in system OFF mode

Hi all

We use an external 32MHz crystal for the nRF51822 and set the register NRF_CLOCK->XTALFREQ to 0xFFFFFF00 according the reference manual V3.0, chapter 13.3. Afterwards the HFCLK is started and we wait for the corresponding event ... (more)

744
views
2
votes
1
answer
Last activity 2015-01-28 16:32:20 +0100 by Asbjørn flag of Norway

No GPIO wakeup from SYSTEM OFF state

We have an nRF51822-based product that goes the SYSTEM OFF in certain situations. We wake up with the DETECT signal from a pin which we set to sensing just before calling sd_power_system_off() The code is really trivial:

...
nrf_gpio_cfg_sense_input(WAKEUP_PIN, NRF_GPIO_PIN_PULLUP ...
(more)

1k
views
1
vote
1
answer
Last activity 2014-11-10 14:15:30 +0200 by Stefan Birnir Sverrisson flag of Iceland

Configure wake up behavior from system off with app_button

I'm using the APP_BUTTON_INIT-Function to register a button at the GPIOTE-System. This works great while running normally, e.g. I can react on debounced button_down or button_release events.

Magically this also works for waking from sd_power_system_off() with a rising ... (more)

471
views
1
vote
1
answer
Last activity 2014-11-06 15:45:25 +0100 by Asbjørn flag of Norway

how to wake up from system off without reseting a variable

Hi,

On my ble application, I want to keep after wake up reset the previous value of a variable, I tried using sd_power_ramon_set(0x000f000f) to keep on all ram partitions when in system off mode but it didn't worked ... (more)

827
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1
vote
1
answer
Last activity 2014-11-03 19:46:49 +0100 by John DeWitt flag of United States

Wakeup system after sd_system_power_off

I used sd_system_power_off to enter to system off mode, now I want to wake up my system and reset it when a button is pressed, how should I do that

Thank you

1k
views
7
votes
4
answers
Last activity 2014-09-19 10:54:51 +0200 by Petter Myhre flag of Norway

System Off [closed]

Hi,

Can you please tell me how can I put the nRF51822 in System Off mode?

Thank you.

Edit: Format

978
views
5
votes
1
answer
Last activity 2014-09-04 18:44:00 +0200 by Nikita

Can I maintain a timer active during off (sleep) state in nRF51822? [closed]

Hi all,

I'm using the nRF51822-EK (PCA10001) and I'm going to develop a bluetooth cadence (and speed) sensor for MTBs. I desire low power consumption and i though to put the nRF in "system off mode" during inactivity ... (more)

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