Undefine reference to "app_timer_start"

[lsvw1217]

Hi,

I faced a problem while building my project. Please see screenshot below

I think I have already include all the files and everything compiled. But this error shows up at the very end. Please advise. 

Thank you.

[AndreasF]

Hi.

Have you also enabled the app timer in sdk_config.h?

Best regards,

Andreas

[lsvw1217]

Hi guys,

Thank you for the speedy reply. I've included the app_timer.h and app_timer.c. 

After I enabled the app timer in sdk_config.h, I did it by change from "APP_TIMER_ENABLED 0" to "APP_TIMER_ENABLED 1". Is this the correct way to do it?

If this is the correct way, after I enable the app timer, I got another error shown in the attach picture. 

Is this something to do with settings in sdk_config again?

Thank you for helping again.

[lsvw1217]

Hi Andreas,

I was using the newest SDK "nRF5_SDK_15.3.0_59ac345".

I made a modification and that is adding "nrfx_power_clock.c" from previous SDK since it wasn't included in the newest SDK.

I got the "nrfx_power_clock.c" from "nRF_SDK_15.2.0_9412b96" so I also try using this SDK but the same error showed up.

Please advise. Thank you!

[AndreasF]

Hi.

lsvw1217 said:

I made a modification and that is adding "nrfx_power_clock.c" from previous SDK since it wasn't included in the newest SDK.

 Can you please remove nrfx_power_clock.c from the project? This file is in SDK 15.3 split up into two different files, nrfx_clock.c and nrfx_power.c.

And add the file you need, nrfx_clock.c.

Best regards,

Andreas

[awneil]

lsvw1217 said:

adding [anything] from previous SDK

is never a good idea!

The whole point of going to all the effort of making a separate SDK release is (as AndreasF says) that things are not the same - so you can't just go taking stuff from one SDK and dropping it willy-nilly into a different SDK!

[lsvw1217]

Hi Andreas and awneil,

Oh I didn't know that. So I tried installing a whole new SDK 15.3 and deleting nrfx_power_clock.c and also make sure app_timer is enabled in the sdk.config. But the same error still shows up. 

I've tried to search the error online and found this.

https://devzone.nordicsemi.com/f/nordic-q-a/51106/linker-issue-in-sdk15-2

According to Amanda, it might be due to different version of app_timer.c in the SDK.

But right now I'm using a whole new SDK 15.3, and files are not modified. So I think they should be from the same version. 

Is there anything else I can try? Maybe download a previous version of SDK? 

Also, could you provide a link to download the newest version of SDK? Maybe I'm downloading the wrong one.

Thank you so much!

[AndreasF]

Hi.

Please make sure that you download SDK 15.3 here.

If you have not worked much with your project, I suggest that you start a new project with a clean downloaded SDK so that you are sure that it contains the correct files.

Best regards,

Andreas