nrf_pwr_mgmt_run() with SoftDevice not go to low power

[Bar]

Hello.

I use SDK16 in my project.

Previously when I want to go on sleep I use __WFI(), and get into sleep till interrupt. Because I use The SoftDevice I change the command to nrf_pwr_mgmt_run() as instruct by Nordic . But now it doesn't enter sleep at all. I try also disable the FPU by NRF_PWR_MGMT_CONFIG_FPU_SUPPORT_ENABLED 0 in the sdk_config.h but didn't help.

Why it is so?

Bar.

[Jared]

Hi, 

How are you determining that the device doesn't go into sleep and are you using a custom board? 

Please provide more information regarding your application such as code. 

best regards

Jared

[Bar]

Hi Jared.

I use my own board where I have a peripheral that take extra power. With __WFI() I get 2ma. With nrf_pwr_mgmt_run()  I get about 8ma.

The relevant code is as follow

#if ((OS_VIEW_IFSELECT != OS_VIEW_IF_JLINK) && (OS_DEBUG == 0))
        if (IdleTicks > 2) // nothing to do wait for interrupt at run time
		{
			// Switch CPU into sleep mode
			nrf_pwr_mgmt_run();
		}

#endif

[Jared]

Hi,

Use a debugger and set a breakpoint inside nrf_pwr_mgmt_run() at line 359 and see if the program hits the breakpoint.

[Bar]

Hi Jored.

It doesn't stop there because I enable the BLE and the softdevice define SOFTDEVICE_PRESENT. So it go to sd_app_evt_wait()

Look at the code.

// Wait for an event.
#ifdef SOFTDEVICE_PRESENT
if (nrf_sdh_is_enabled())
{
ret_code_t ret_code = sd_app_evt_wait();
ASSERT((ret_code == NRF_SUCCESS) || (ret_code == NRF_ERROR_SOFTDEVICE_NOT_ENABLED));
UNUSED_VARIABLE(ret_code);
}
else
#endif // SOFTDEVICE_PRESENT
{
// Wait for an event.
__WFE();
// Clear the internal event register.
__SEV();
__WFE();
}

As I see it when it use BLE with SOFTDEVICE and it is enable it should go there.

Is there a problem about it?

Bar.

[Jared]

Hi,

Sorry for the confusion, you're absolutely correct. Does it go to the WFE() inside the sd_app_evt_wait()?