Building nRF5340 project with multiple external dependencies that depend on each other

[Omegaki113r]

Hi,

I am running into a cmake build error when i try to include external projects. Here's what i have done and what are the issues i am running into,

1) i studied the sdk-zephyr/external_library example
2) After looking at that example i created a custom firmware that depends on an external library. (i used Zephyr SPIM apis to create one of my own driver.) that project builds and runs successfully.

So the SPI_test project depends on the OmegaSPIController external library that i wrote. This compiles and works perfectly.

3) Now i need to create a different firmware.That main project will include 2 external libraries,

      * OmegaSPIController (the one i created on 2nd step and tested)
      * OmegaADS129xController (this is a new external library that i wrote. This library needs the OmegaSPIController library [there for this library has a dependency on SPI driver i wrote])

Above is the Project structure

Above is the CMakeLists.txt file of the project that includes both my external projects

Above is the Makefile of the OmegaSPIController external project

Above is the Makefile of the OmegaADS129xController external project. (Like i mentioned this project needs to depend on the OmegaSPIController external library)

Above is the header file of the ADS129X external library showing that it depends on the SPI






QUESTION:
When i try to compile the project the compilation failed due to the ADS129x code not seeing the SPI header file.

it almost feels like i need to add something on the CMakeLists.txt on the main project or inthe makefile of the ADS129x external library to make it see the SPI library.

1) Can someone let me know what i am missing?
2) What and where i need to add to make this code compile and link

[Einarh]

Hello

I would suspect that you'll have to include the SPI controller project in the makefile of your OmegaADS129xController project, since your ADS project needs to find the OmegaSPIController.h file.

As far as I can see you haven't done this, or am I missing something?

Best regards,

Einar

[Omegaki113r]

yeah.
i haven't done something like that.

i thought putting this on the main project's CMakeLists.txt took care of that

So it seems like that doesn't take care of it.


can you explain how/what i need to put on the "OmegaADS129xController" makefile to make the code compile.

[Einarh]

I think that just makes them compile in the right order, which is good, but you'll have to make sure the SPI project header file is visible to your ADS project.

Which would be done by including the SPI project in your ADS project's makefile I believe, have a look here, I believe this case is pretty similar to yours:

https://stackoverflow.com/questions/15045748/how-to-use-external-libraries-and-headers-in-c-makefile

-Einar

[Omegaki113r]

Quick question before that.

So the projects created by the VSCode for Zephyr is based on CMake. But the external project example (external project itself) is using makefile. I know this is written like that to show that the Zephyr can build project that get build from other build systems as well.

But is there a way that instead of makefile on the external project to use CMake on there as well?

Do we have guidance to do that?

[Omegaki113r]

Yes. this Stackoverflow thread helped to make the code compile. Compilation is happening successfully now. But there is a linking error. that the ADSController library cant find the C functions from the SPIController.c

but let me look into that more before i get back to you. most likely a typo in my end.