Enabling nRF5 DCDC using BLE example

[Nick_RA]

I'm looking at power consumption using nRF52 DK and PPK2. Using the example project ble_app_uart with S112 & Segger Embedded Studio.

Although I've enabled the DC/DC in the config file (I think!) I can't see any change in the power profile: the current consumption is unchanged as I vary the input voltage, it seems to be stuck in LDO mode. What am I missing here?

Thanks

1004.sdk_config.h

[mrono]

Nick_RA said:

So I need at add the nrfx power driver and use that to enable the DCDC?

Yes, if you add nrfx_power to your project and call nrfx_power_init() then DCDC will be set according to those defines set in sdk_config.

If you open nrfx_power.c and check how those defines are actually used, you'll see that the only thing needed to enable DCDC is to call: void nrf_power_dcdcen_set(bool enable).

So it is up to you to decide if you want to add nrfx_power or just call that one function without the full driver. Nrfx_power does have other power related features such as the power fail comparator, so check if those are useful to your project as well.

[Nick_RA]

OK that seems to be tha answer, thanks. Actually because of some vagarity with my sdk_config it wouldn't compile in, but I don't want to delve down that rabbit hole just at this moment. I looked at the source and from that just enabled the register for now & it works fine.

NRF_POWER->DCDCEN = true;