nrf_drv_clock module - undefined reference error

[Simon]

In nRF5_SDK_15.3.0 some undefined reference error reported when using nrf_drv_clock module (example: undefined reference to `nrf_drv_clock_hfclk_release)

The problem is in SDK_ROOT\integration\nrfx\legacy\nrf_drv_clock.c. Instead of nordic_common.h, sdk_common.h should be included

existing:

#include <nordic_common.h>
#include "nrf_drv_clock.h"

#if NRF_MODULE_ENABLED(NRF_CLOCK)

fixed:

#include "sdk_common.h"
#if NRF_MODULE_ENABLED(NRF_CLOCK)
#include "nrf_drv_clock.h"

[Simon]

from where did you took nrfx_config.h file from? I took it from SDK->modules->nrfx->templates->nRF52840 and placed it to config folder inside target.

I am using SDK version 15.3.0.

[Edvin]

Ok. That explains the confusion.

I took the nrfx_config.h file is from SDK\integration\nrfx\nrfx_config.h. This is the one that is included in the project files in the SDK. To be honest, I wasn't aware of the nrfx\templates. 

It looks like the ones in the template folder are meant for replacements for sdk_config.h. Try to include the one from the SDK\integration\nrfx\ folder.