Subscribing to power manager events.

Question

Hi!

I am trying to subscribe to the power management events that correspond to the following log lines (which I can clearly see in the log):

I: POWER event ready
I: POWER event removed
I: SUSPEND state detected
I: RESUMING from suspend

I have been trying with this code:

#include "power.h"
#include <zephyr/logging/log.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/sys/util.h>
#include <zephyr/pm/device.h>
#include <zephyr/pm/state.h>
#include <zephyr/pm/pm.h>

LOG_MODULE_REGISTER(my_module, LOG_LEVEL_INF);

void pm_notifier_cb(enum pm_state state)
{
    printk("PM: %i", state);
}

static struct pm_notifier notifier = {
    .state_entry = pm_notifier_cb,
    .state_exit = pm_notifier_cb,
};

void InitPower(void) {
    printk("Power Init");
    pm_notifier_register(&notifier);
}

I have extended prj.conf with:

CONFIG_PM_DEVICE_RUNTIME=y
CONFIG_PM_DEVICE=y
CONFIG_PM=y

Results:

- "Power Init" is getting printed just fine
- but the callback is never called.

Setup:

- NCS_VERSION=v2.6.0
- Running from Ubuntu
- Any other info needed?

Any idea what I am doing wrong?

kat829 · Accepted Answer

In case anyone comes across this, our usb expert has discovered following solution: 
 if ((NRF_POWER->USBREGSTATUS & POWER_USBREGSTATUS_VBUSDETECT_Msk) == POWER_USBREGSTATUS_VBUSDETECT_VbusPresent) {
 printk("USB power available
");
}
 
 Source: 5.3.7.5 of infocenter.nordicsemi.com/.../nRF52840_PS_v1.0.pdf 
 It's not perfect, since we would like to also have a callback that notifies us of changes... but so far seems to work reliably.

Subscribing to power manager events.

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