nrf52832 undefined reference to `nrfx_comp_init'

[L.B.]

Hello guys,

I'm trying to use the new NRFX library but I've hit the wall with the following error when trying to use the comparator API:

undefined reference to `nrfx_comp_init'

This happens during the link stage. I can see the nrfx_comp.c being compiled, I've set the #define NRFX_COMP_ENABLED 1 in sdk_config.h but the error still persists.

I've included #include "nrfx_comp.h" in my project.

I'm using GCC. Any help is appreciated.

Regards,

L. B.

[L.B.]

Hi, I've managed to solve this issue by myself.

In my Makefile I've added -DCOMP_ENABLED=1 in the CFLAGS section.

The problem has something to do with

/nRF5_SDK_17.0.0_9d13099/integration/nrfx/legacy/apply_old_config.h

but I don't have time to investigate.

I hope this helps!

Regards,

L. B.

[Shahar]

This means you might have the nrf_drv_comp (obsolete) COMP_ENABLED present in your sdk_config.h (which overrides NRFX_COMP_ENABLED)

Look at your sdk_config.h for this

//==========================================================
// <e> COMP_ENABLED - nrf_drv_comp - COMP peripheral driver - legacy layer
//==========================================================
#ifndef COMP_ENABLED
#define COMP_ENABLED 0
#endif

And comment it out.

[L.B.]

Hahaha you got me there! :-)

This was it - when I commented out those three lines it worked as expected.

No need to do the -DCOMP_ENABLED=1 in the Makefile.

[Shahar]

This is a known issue, where in some example projects sdk_config.h it's resolved and some not.

This is why I maintain my own base sdk_config.h version (per SoftDevice) which I have 

#ifdef NRF_LEGACY_LAYER_ENABLED

...

#endif // NRF_LEGACY_LAYER_ENABLED

Surrounding all legacy nrf_drv #define (to allow easier merge of newer sdk_config.h versions)