How to include existing header files to main.c?

[MRafiq9748]

Hello.

I want to integrate UART and SPI ,I am using SDK15.2. The problem here is i am not able to add app_uart.h to main.c(spi).

My question here is how to add it to main,c? 

I am using Keil uVision.

Thanks in Advance. 

[MRafiq9748]

I am able to include all the necessary files,but when i build it shows 2 errors.

I am attaching the picture of error message along with Screenshot of a file in program which appears in faded form.

  

[awneil]

It's generally better to copy & paste errors as text - rather than a picture.

But your picture is clear enough to see in this case.

Again, this is a standard 'C' issue: header files just contain declarations (function prototypes)  - so you also need to add the source (.c) file (or pre-built binary library) with the definitions of those functions.

http://c-faq.com/decl/decldef.html

And, again, there is a Nordic-specific twist that the correct settings in sdk_config.h are also required.

https://devzone.nordicsemi.com/f/nordic-q-a/39503/undefined-reference-on-the-linker-level

[MRafiq9748]

Have done all the necessary steps in program,also in sdk_config.h.Its not showing any errors now,but when i look on putty nothing appears.If we comment uart portion in main, nrf_log_info statements appear.

Whats the problem?

Any help would be appreciated.

[Simonr]

Hi

What most people have trouble with is forgetting to enable something in the sdk_config.h file. You have to go through the sdk_config.h file of a uart example, and make sure that all functions enabled there are also enabled in your projects sdk_config file, as in setting all functions that are set to 1 in the example sdk_config to 1 in your project as well. If there are some functions enabled in the example file that is not at all in your project, you will have to copy/paste those. 

Best regards,

Simon

[MRafiq9748]

Thanks.

We have already enabled all functions accordingly in config and no error is shown.

NRF_LOG_DEFAULT_BACKENDS_INIT() creates problem.

when we comment it only uart works but when we uncomment it nothing works.

We want both UART and SPI to work .

Any help would be highly appreciated.

Best Regards,

M Rafiq.