Device does not come out of low power

RE: Device does not come out of low power

Vidar Berg — Tue, 29 Oct 2024 08:26:21 GMT

It's my bad, I should have referenced the full function name without any abbreviation. Anyway, thanks for confirming that you see the same behavior with __WFI(). This suggests that the issue isn’t with the sleep function (__WFI() or nrf_pwr_mgmt_run()) but rather that the RTC isn’t triggering the wake-up interrupt as expected.

RE: Device does not come out of low power

geert_venken — Mon, 28 Oct 2024 16:54:28 GMT

Sorry for the misunderstanding.

Now I got your point. In nrf_pwr_mgmt_run I removed all related to softdevice and always call __WFI.

No success. Same behavior.

I also enabled PWR_MGMT_DEBUG_PIN_SET and routed this to a LED. Goes on but never off.

Watchdog resets the system.

RE: Device does not come out of low power

geert_venken — Mon, 28 Oct 2024 13:53:30 GMT

SD function?

Do you mean, if I replace WFE by WFI or visa versa in nrf_pwr_mgmt_run?

This does not make a difference, same behavior.

RE: Device does not come out of low power

Vidar Berg — Mon, 28 Oct 2024 13:42:42 GMT

Hm, does it work if you replace the SD function with a __WFE() or __WFI()?

RE: Device does not come out of low power

geert_venken — Mon, 28 Oct 2024 13:41:11 GMT

Vidar,

This line was already in the function OS_InitHW, added it additionally ot main, but no success.

RE: Device does not come out of low power

Vidar Berg — Mon, 28 Oct 2024 12:28:28 GMT

Geert,

[quote userid="4240" url="~/f/nordic-q-a/115849/device-does-not-come-out-of-low-power/508138"]EDIT: Please enable SEVONPEND to see if it helps. You can do this by adding this line at the beginning of main():[/quote]

This will be needed to wakeup on pending RTC IRQ ( if interrupt is disabled for this IRQ).

Best regards,

Vidar

RE: Device does not come out of low power

geert_venken — Mon, 28 Oct 2024 12:26:39 GMT

Hi Vidar,

We are using embOS and interrupts are enabled.:

This is the Idle funciton:

void OS_Idle(void) { // Idle loop: No task is ready to execute
#if USE_TICKLESS_IDLE == 1
if (low_power_enabled) {
OS_INT_IncDI();
OS_TIME idleTicks = OS_TICKLESS_GetNumIdleTicks();
if (idleTicks > RTC_WAKEUP_MIN_TIME) {
if (idleTicks > RTC_WAKEUP_MAX_TIME) {
idleTicks = RTC_WAKEUP_MAX_TIME;
}
if (idleTicks > 1000) { // more than 1 second
rtc_suspend_interrupt();
}
rtc_set_wakeup(idleTicks, &WakeupCallback);
SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |
SysTick_CTRL_ENABLE_Msk; /* Disable SysTick IRQ */
OS_TICKLESS_Start(idleTicks, &EndTicklessMode);
}
OS_INT_DecRI();
}
#endif
#if USE_LOAD_MEASUREMENT == 1
while (1) { // Nothing to do ... increment counter for load measurement
OS_INC_IDLE_CNT();
}
#else
while (1) { // Nothing to do ... wait for interrupt
if (low_power_enabled) {
nrf_pwr_mgmt_run();
}
}
#endif
}

Interrupts are disabled around the RTC calculations and function but not around the nrf_pwr_mgmt_run function.

What I noticed when the WFE is called (in the debugger)

Must these be set to 1?

thanks,

Geert

RE: Device does not come out of low power

Vidar Berg — Mon, 28 Oct 2024 12:16:32 GMT

Hi,

Are you using embOS and do you know if interrupts are disabled when this function is called?

Thanks,

Vidar

EDIT: Please enable SEVONPEND to see if it helps. You can do this by adding this line at the beginning of main():

SCB->SCR |= SCB_SCR_SEVONPEND_Msk;