MCUXPRESSO Zephyr Custom Device Driver

[bretts]

I'm trying to add support for a custom board and custom device drivers (I have an FRAM chip that is not supported).  I have been able to get the custom board to build, but I cannot get my custom driver to build (or to get Kconfig invoked).  I have the following tree:

Or alternate view:

I just need a template to get started with the custom drivers.  I have found an example that is using west directly, but not the mcuxpresso build system.  Does anyone have any experience with this?

Thank you,

Brett Swimley

[diego_charles]

Hi @bretts 

My apologies for the delayed response.

To add custom driver, the simplest way is to edit the Cmakelist associated to your project.

This way, I created the most simple driver on the drivers folder. 

Then I called the driver function on main and it worked. This is related to this.

https://cmake.org/cmake/help/latest/command/target_sources.html

I think it is okay for a single file, but for a complete directory not. So I think this could do better the job 

https://cmake.org/cmake/help/latest/command/include_directories.html

If you want to include an nxp sdk  driver , you could check out this post from Derek

https://community.nxp.com/t5/Zephyr-Project-Knowledge-Base/Using-MCUXpresso-SDK-drivers-in-a-Zephyr-...

I hope this could help you! 

Diego

[ARosman]

Hi,

Is this even supported in MCUXpresso for VSCODE? I followed some tutorial and it seems that the driver compiles correctly, but it doesn't link to the main app, returning  undefined reference to '__device_dts_ord_xx'.

Any new information about how to build Custom drivers?

Ales

[bretts]

I am basing my custom board off the MIMXRT1024 (we have successfully used this in a previous project with MCUXpresso SDK and FreeRTOS).  As a test, because I know we will eventually need it, I want to build a custom board, and I am trying to interface it to an SPI FRAM part (again, we have used this part previously).  I cannot figure out how to get the project to recognize my custom driver directory.  I looked at the example-application as part of the Zephyr project, but that uses west as the build system, and the application has a Kconfig file.  Everytime I add a Kconfig file to my application root directory, I run into build errors.

Any thoughts?

[bretts]

I am tempted to just move to the "out of the box" zephyr development, rather than trying to use the visual studio code mcuxpresso extension.

[Alondra]

Hello Brett,
Which part number are you using?

Best regards