Device does not come out of low power

[geert_venken]

We are using nRF52833 with Softdevice S113 for BLE.

in the OS_Idle function, nrf_pwr_mgmt_run is called.

But never comes out of sleep.

Is there a need to call nrf_drv_power_sleepevt_init?

Are examples available?

thanks

Geert Venken

[Vidar Berg]

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;

[geert_venken]

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

[Vidar Berg]

Geert,

Vidar Berg said:

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

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

Best regards,

Vidar

[geert_venken]

Vidar,

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

[Vidar Berg]

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

[geert_venken]

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.

[geert_venken]

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.  

[Vidar Berg]

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.