How do I pass device information instance from one file to another?

[KRA]

Hi 

I am working with nrf52832 development kit. I am trying to write device information service from central device to peripheral device. 

I am successfully able to write manufacture name if I device information instance, db_descovery_init and device information handler in same file.

Due to my project requirements I had to separate out files, so as per now I have 2 files

I file a.c

Db_descovery_init

And in file b.c

Device information init

Note that I have created my device information instance in file a.c

Now the problem is my device information instance does not pass the same value as I pass through db_descovery_init. Every time in file b.c I got the NULL value of the instance.

I know this may be because of the static declaration of the instance. 

How do I solve this issue? 

I will appreciate your timely help.

Thanks,

KRA

[Einar Thorsrud]

Hi,

It is not clear to me what you have done. Is the case that you want a global variable that is accessible from two (or more) C files? If so, then you need to declare it normally in one of the files (make sure it is not static). In the other files (or in a .h file that is included in the other files), you declare it in the same way but prefixed with extern. This way you can access the same variable in multiple files.