nRF7002dk nrf5340 Power Consumption

RE: nRF7002dk nrf5340 Power Consumption

Marte Myrvold — Thu, 19 Oct 2023 11:08:16 GMT

Hi,

I am glad to hear that it solved the issue!

Best regards,
Marte

RE: nRF7002dk nrf5340 Power Consumption

bcornell — Wed, 18 Oct 2023 14:51:55 GMT

Hello,

I noticed this change had been merged into main, so I rebased and re-tested my project. I am happy to report that with this commit, the power consumption issues we have been experiencing appear to have been resolved. Thank you for you help with this issue.

Once we have a stable NCS release with these changes included, we should be able to consider this issue resolved.

RE: nRF7002dk nrf5340 Power Consumption

Marte Myrvold — Wed, 18 Oct 2023 08:06:10 GMT

Hi,

The nRF7002 does not directly configure NRF_GPIOTE0_S, but it might be an indirect dependency.

Can you try with this https://github.com/nrfconnect/sdk-nrf/pull/12744? This disconnects the Wi-Fi GPIOs when the Wi-Fi interface is shut down.

Best regards,
Marte

RE: nRF7002dk nrf5340 Power Consumption

Marte Myrvold — Tue, 17 Oct 2023 09:13:44 GMT

Hi,

I have forwarded this to the developers, and I am waiting on a response from them. I will update you as soon as I know more.

Best regards,
Marte

RE: nRF7002dk nrf5340 Power Consumption

bcornell — Fri, 06 Oct 2023 14:33:47 GMT

I was able to determine what causes the increased power consumption using Ozone and the lbs_peripheral sample with and without the WiFi constants included in the build.

The nrf7002 driver configures the following registers:

NRF_GPIOTE0_S->INTENSET
NRF_GPIOTE0_S->INTENCLR
NRF_GPIOTE0_S->CONFIG[7]

If I read them without the WiFi driver compiled in, their values are:

NRF_GPIOTE0_S->INTENSET = 0x80000000;
NRF_GPIOTE0_S->INTENCLR = 0x80000080;
NRF_GPIOTE0_S->CONFIG[7] = 0x00000000;

If I enable WiFi support, and do nothing else in the lbs_peripheral sample, the idle current draw is ~165uA. If I set the registers as specified above, the idle current draw is ~40mA, which is what I measure when not enabling WiFi support.

Obviously these registers need set when using WiFi, but I suspect the nrf7002 driver should reset these registers when the interface is shut down.

RE: nRF7002dk nrf5340 Power Consumption

bcornell — Tue, 03 Oct 2023 20:13:34 GMT

Hello,

Today, I started from the wifi/sta sample in the latest main branch. I disabled the console and serial logging. In the code, immediately following a successful connection, I added a call to the wifi_disconnect function that I posted above as well as a call to the net_if_down function as you recommended. I did not enable any Bluetooth functions for this test.

After connecting, disconnecting and shutting down the interface I see 165uA of current draw at 1.8v from the nrf5340.

At this point the nrf5340 should be completely idle, the code "running" in the main loop is a k_sleep(K_FOREVER).

In non-WiFi tests of the nrf5340, the idle power consumption is significantly lower. Why is it so high when WiFi support is compiled in? Is there anything I can manually turn off to reduce power consumption which is turned on by the WiFi driver?

RE: nRF7002dk nrf5340 Power Consumption

Marte Myrvold — Fri, 01 Sep 2023 12:24:16 GMT

Hi,

[quote user="bcornell"]I have copied the wifi_disconnect function from the sr_coex sample:[/quote]

With this you are disconnecting from the Wi-Fi network, but you are not actually shutting down the Wi-Fi interface. You can look at the code that runs when you shut down the interface with, for example, net iface down 1 in net_if_down() here: https://github.com/nrfconnect/sdk-zephyr/blob/v3.3.99-ncs1/subsys/net/ip/net_if.c#L4229.

Best regards,
Marte

RE: nRF7002dk nrf5340 Power Consumption

bcornell — Thu, 31 Aug 2023 12:46:28 GMT

[quote userid="92402" url="~/f/nordic-q-a/100338/nrf7002dk-nrf5340-power-consumption/443842"] What do you see if you compare the Peripheral LBS sample with Peripheral LBS sample where you have enabled Wi-Fi and nRF7002 and also shutdown Wi-Fi?[/quote]

I do not understand what you are asking. My understanding is that the "wifi/sta" sample is the most basic example that demonstrates working WiFi. In order to add working WiFi to the Peripheral LBS sample, wouldn't I just be copying all the WiFi code from the WIFi/STA sample to the Peripheral LBS sample? The resulting code would be exactly the same.

[quote userid="92402" url="~/f/nordic-q-a/100338/nrf7002dk-nrf5340-power-consumption/443842"]How are you disconnecting the Wi-Fi?[/quote]

I have copied the wifi_disconnect function from the sr_coex sample:

static int wifi_disconnect(void)
{
	struct net_if *iface = net_if_get_default();
	int status;

	context.disconnect_requested = true;

	status = net_mgmt(NET_REQUEST_WIFI_DISCONNECT, iface, NULL, 0);

	if (status) {
		context.disconnect_requested = false;

		if (status == -EALREADY) {
			LOG_INF("Already disconnected");
		} else {
			LOG_ERR("Disconnect request failed");
			return -ENOEXEC;
		}
	} else {
		LOG_INF("Disconnect requested");
	}

	return 0;
}

I call this function after successful connection, before sleeping the main thread.

RE: nRF7002dk nrf5340 Power Consumption

Marte Myrvold — Thu, 31 Aug 2023 07:47:48 GMT

Hi,

You are comparing two different samples, so there might be other parts increasing the power consumption as well. What do you see if you compare the Peripheral LBS sample with Peripheral LBS sample where you have enabled Wi-Fi and nRF7002 and also shutdown Wi-Fi?

[quote user="bcornell"]Why does the nrf5340 consume so much power when the nrf7002 wifi support is compiled in and disconnected as compared to compiled out?[/quote]

How are you disconnecting the Wi-Fi?

Best regards,
Marte

RE: nRF7002dk nrf5340 Power Consumption

bcornell — Tue, 29 Aug 2023 13:59:09 GMT

Hello,

I did some further testing using the main branch instead of the released 2.4.0 version.

I am powering the nrf5340 at 1.8v, separately from the nrf7002.

I am using a modified copy of the "wifi/sta" sample which disconnects from WiFi and sleeps the main thread after successful connection. It also contains large sections of the "peripheral_lbs" code to enable BLE advertising. When I build and run this code, the nrf5340 consumes about ~160uA. This is substantially better than my original test with the released version of the SDK.

On the same development board, if I build and run the "peripheral_lbs" code the nrf5340 only consumes about ~30uA.

Both applications are set with a significantly longer advertising interval than default to reduce power consumption. I have also disabled all logging.

Why does the nrf5340 consume so much power when the nrf7002 wifi support is compiled in and disconnected as compared to compiled out?

RE: nRF7002dk nrf5340 Power Consumption

Marte Myrvold — Wed, 02 Aug 2023 14:32:26 GMT

Hi,

We do not have documentation listing all configurations, but we have General power optimization recommendations and Developing with nRF70 Series - Operating in power save modes.

[quote user="bcornell"]Can you provide an estimate as to when nRF Connect SDK 2.5.0 will be released? [/quote]

For questions about timeline and future releases, please contact our regional sales manager.

Best regards,
Marte

RE: nRF7002dk nrf5340 Power Consumption

bcornell — Tue, 01 Aug 2023 12:50:45 GMT

Hello,

I recently setup a development environment using the main branch instead of the released 2.4.0 version.

By adding a disconnect before the sleep in the main loop of the "wifi/sta" example I was able to achieve ~275uA idle power draw.

I was not able to achieve low idle current draw with the "peripheral_lbs" example code from the main branch. I disabled logging in the defconfig files and in the board dts files, exactly as I had done in version 2.4.0 and only managed to get the idle power consumption down to ~1.3mA.

Do you have any documentation which lists all of the configuration/board files that need modified to ensure minimum power draw?

Can you provide an estimate as to when nRF Connect SDK 2.5.0 will be released?

RE: nRF7002dk nrf5340 Power Consumption

Marte Myrvold — Mon, 17 Jul 2023 13:08:17 GMT

Hi,

Powering off the nRF7002 when not in use has been fixed and merged into nRF Connect SDK. It is currently on the main branch. Shutting down the interface (e.g. using net iface down 1) will shut off Wi-Fi so that it only draws ~2uA.

Best regards,

Marte

RE: nRF7002dk nrf5340 Power Consumption

bcornell — Tue, 11 Jul 2023 15:31:06 GMT

Hello,

Has there been any updates on a patch for the SDK?

Our project has been halted while we wait for an update.

Thanks,

RE: nRF7002dk nrf5340 Power Consumption

Marte Myrvold — Thu, 22 Jun 2023 07:45:26 GMT

Hi,

I am glad to hear that the patch reduced the current consumption, and I have forwarded your findings to the developers.

They are still working on a patch for the SDK, but I will let you know if there are any updates.

Best regards,
Marte

RE: nRF7002dk nrf5340 Power Consumption

bcornell — Tue, 20 Jun 2023 15:22:07 GMT

I believe the fix the developers are working on to shut the WiFi interface down is exactly what we are looking for.

I downloaded the patched QSPI driver, disabled logging, and built the included WiFi station code for the nRF7002 DK. The idle power consumption after disconnect with that sample is ~300uA. Significantly better, but not as good as if I compile out support for WiFi.

For our application we intend to connect to WiFi once every few hours and then disconnect and disable WiFi until it is time to connect again to ensure the longest battery life.

I would be happy to test any patches related to shutting the WiFi down as soon as they are available.

Thanks,

RE: nRF7002dk nrf5340 Power Consumption

Marte Myrvold — Tue, 20 Jun 2023 09:13:41 GMT

Hi,

I have a new update from the development team.
First of all, this is non Wi-Fi mode and might need a fix at system level to power down QSPI properly. The developers are working on a fix where putting the Wi-Fi interface down should shut off the Wi-Fi chip (and QSPI as well), thus decreasing power consumption.

I also got a response from someone who has patched the nRF7002 DK QSPI driver. When nRF5340 QSPI transaction is done, HFCLK192M Div4 setting is applied. I will upload the driver here.
The zip file also has a modified version of the Wi-Fi Station sample if you want to have a look at that. It connects to an AP and disconnects. The HFCLK192M Div4 setting may lower the nRF5340 idle current by 1mA, depending on measurement conditions.

devzone.nordicsemi.com/.../nrf_5F00_nrf7002_5F00_hfclk192m_5F00_div4_5F00_bf39293.zip

Best regards,
Marte

RE: nRF7002dk nrf5340 Power Consumption

bcornell — Fri, 09 Jun 2023 19:26:31 GMT

I noticed there was a newer nRF Connect SDK version available (v2.4.0). I setup a new installation directory and was able to reproduce my test with the latest version without any changes to the power consumption.

RE: nRF7002dk nrf5340 Power Consumption

bcornell — Fri, 09 Jun 2023 15:02:07 GMT

Thanks for getting back to me.

I downloaded the latest nrf_qspi_nor.c from that link on github. After replacing the driver in my environment with the new one, I do not see any changes to behavior or power consumption.

RE: nRF7002dk nrf5340 Power Consumption

Marte Myrvold — Fri, 09 Jun 2023 11:05:14 GMT

Hi,

It could be related to this fix missing in the Wi-Fi QSPI handling:

https://github.com/nrfconnect/sdk-zephyr/blob/v3.3.99-ncs1/drivers/flash/nrf_qspi_nor.c#L277

NRF_QSPI hardware module must be set in a lower clocked mode when in idle to achieve uA sleep range.

Best regards,
Marte

RE: nRF7002dk nrf5340 Power Consumption

Marte Myrvold — Fri, 09 Jun 2023 10:46:52 GMT

Hi,

I have been out of the office.

I have asked the development team about this issue, and I will update you when I get a response.

Best regards,
Marte

RE: nRF7002dk nrf5340 Power Consumption

bcornell — Fri, 02 Jun 2023 14:50:19 GMT

Hello,

I have added CONFIG_NRF700X_QSPI_LOW_POWER=y to prj.conf for the peripheral_lbs sample and did not see any reduction in power consumption.

RE: nRF7002dk nrf5340 Power Consumption

Marte Myrvold — Fri, 02 Jun 2023 14:31:01 GMT

Hi,

You can enable low power mode for QSPI by setting CONFIG_NRF700X_QSPI_LOW_POWER=y. This should reduce the consumption significantly.

Best regards,
Marte

RE: nRF7002dk nrf5340 Power Consumption

Marte Myrvold — Thu, 01 Jun 2023 13:58:39 GMT

Hi,

I have started looking into this issue and will come back to you tomorrow.

Best regards,
Marte