nRF5340-DK Low Power Configuration Issues

RE: nRF5340-DK Low Power Configuration Issues

hatt-mazley — Mon, 20 Sep 2021 12:43:28 GMT

Hi - I got this working.

It was a problem with segger embedded studio, there might be a potential bug with it.

It was not finding my .dtoverlay file - it had duplicated the path string behind the file so it could not find it.

When I stopped using the IDE and went to West on the terminal, it found the dtoverlay fine:

-- Found devicetree overlay: /Users/mhazley/src/nrf-low-power-investigation/application/boards/nrf5340dk_nrf5340_cpuappns.overlay

The build from west gave me an average current of 8uA

RE: nRF5340-DK Low Power Configuration Issues

hatt-mazley — Tue, 14 Sep 2021 15:52:22 GMT

Thanks for discussing internally, I will try the hooks tomorrow and let you know.

RE: nRF5340-DK Low Power Configuration Issues

Øyvind — Tue, 14 Sep 2021 10:57:14 GMT

I'm currently discussing the this internally, trying to find a good answer to this. I'm uncertain if adding CONFIG_PM will activate the Power Management automatically or if you need to enable it by adding e.g.

/**
 * @brief Put processor into a power state.
 *
 * This function implements the SoC specific details necessary
 * to put the processor into available power states.
 *
 * @param info Power state which should be used in the ongoing
 *	suspend operation.
 */
void pm_power_state_set(struct pm_state_info info)

Or if the k_cpu_idle() is sufficient for your use. Can you please try adding Power Management hooks into your main?

RE: nRF5340-DK Low Power Configuration Issues

hatt-mazley — Fri, 10 Sep 2021 16:26:10 GMT

Ok, so based on the blog, I have made some changes but get exactly the same result.

I have added hci_rpmsg.conf in a folder in named child_image as described, copied ncs\v1.6.1\zephyr\samples\bluetooth\hci_rpmsg in and changed LOG and SERIAL to n

CONFIG_LOG=n
CONFIG_SERIAL=n

CONFIG_RPMSG_SERVICE=y
CONFIG_RPMSG_SERVICE_MODE_REMOTE=y

CONFIG_HEAP_MEM_POOL_SIZE=8192

CONFIG_MAIN_STACK_SIZE=512
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=512
CONFIG_BT=y
CONFIG_BT_HCI_RAW=y
CONFIG_BT_MAX_CONN=16
CONFIG_BT_CTLR_ASSERT_HANDLER=y
CONFIG_BT_HCI_RAW_RESERVE=1

CONFIG_ASSERT=y
CONFIG_DEBUG_INFO=y
CONFIG_EXCEPTION_STACK_TRACE=y

Added the following to my prj.conf
```
CONFIG_PM=y
CONFIG_PM_DEVICE=y
```

Disabled Uart0 and Uart1 in nrf5340dk_nrf5340_cpuappns.overlay

&uart0{

    status="disabled";
};

&uart1{

    status="disabled";
};

I still get the base current of around 200uA as shown...

On that blog post it says:

"Power Management Subsystem can put an idle system in one of the supported power states, based on the selected power management policy and the duration of the idle time allotted by the kernel"

I am making the idle call at the end of my main, do I also need to set some kind of power policy via my code?

RE: nRF5340-DK Low Power Configuration Issues

hatt-mazley — Fri, 10 Sep 2021 14:27:05 GMT

Ok, if I bridge SB40 again on the dev kit, I can use the PPK off the DK

DUT set to External, Power Select set to Reg, I get same result as before.

Based off the blog you linked, I am now looking at disabling the peripherals to see if it has an effect.

RE: nRF5340-DK Low Power Configuration Issues

hatt-mazley — Fri, 10 Sep 2021 14:16:37 GMT

That was the level I was seeing being I turned off all the logging configs on main app and SPM and HCI_RPMSG images

PPK is 1.0.0 2016.27

DK is 0.11.0 2020.50

I can only run the PPK when attached on top, for some reason, once I cut SB40 for the current measurements, I cannot power my device from an external source

RE: nRF5340-DK Low Power Configuration Issues

Øyvind — Fri, 10 Sep 2021 13:40:10 GMT

Here is my measurement running the PPK2

And here is measured using PPK1 (not mounted on top)

What version of the PPK1 and the DK are you running? What version of NCS are you running?

RE: nRF5340-DK Low Power Configuration Issues

hatt-mazley — Fri, 10 Sep 2021 13:24:49 GMT

I did not see this. I will work through this now.

RE: nRF5340-DK Low Power Configuration Issues

Øyvind — Fri, 10 Sep 2021 12:50:19 GMT

By the way did you see our blog post on Optimizing power on nRF53 designs?

RE: nRF5340-DK Low Power Configuration Issues

hatt-mazley — Fri, 10 Sep 2021 12:10:24 GMT

Hi - Just so its clear, I am using PPK 1 and I am measuring by placing the PPK1 on top of the DK and setting both switches to DK. This means Power Profiler software is talking to PPK via the J-Link on the DK.

RE: nRF5340-DK Low Power Configuration Issues

Øyvind — Fri, 10 Sep 2021 11:53:15 GMT

Scratch that, it's been a while since I used the PPK1. Measuring by following the "Measuring current on custom hardware without an nRF5 DK" chapter worked for me. Let me program the attached project and configure my kit similar to yours.

-Øyvind

RE: nRF5340-DK Low Power Configuration Issues

Øyvind — Fri, 10 Sep 2021 11:11:20 GMT

Hello,

To verify, are you using PPK1 or PPK2? I'm not able to connect my PPK1 to the nRF5340 DK. If using PPK1, what versions of the kits are you working with?

Thank you!

Kind regards,
Øyvind