Support for FlexPRET platform

[magnmaeh]

This PR adds support for the FlexPRET platform.

[magnmaeh]

I believe this PR now is ready for review :)

[magnmaeh]

One change I made that probably affects other platforms too:

I added #include "low_level_platform.h" in platform.h and target_link_libraries(lf-platform-api INTERFACE lf-low-level-platform-api) to platform's CMakeLists.txt. This ensures low_level_platform.h is always included when platform.h is included, which I think makes a lot of sense.

EDIT: This caused Zephyr CI tests to fail, so removed this.

[lhstrh]

This generally looks very good. I left some comments/questions.

[magnmaeh]

Thank you for the review! I'm on vacation until Friday, so there will be much less work on my end until then, just so you know. Might do a little work here and there :)

[magnmaeh]

Hmm, no jobs were run... Do you know what the issue might be @lhstrh?

[erlingrj]

Looks mostly good, but I dont like that platform-specific details are creeping out of low-level-platform

[magnmaeh]

@erlingrj I fixed all concerns now. I was able to fix the underlying issue that made me add the platform-specific code in util.c and tracepoint.h in the first place (#412 (comment)). Only thing is I don't exactly understand why just the first test runs...

EDIT: Right, I was referencing a file that does not exist in the main LF repo yet

[erlingrj]

This looks good to me. If you want to run CI with a specific branch of lingua-franca, then write the branch name into lingua-franca-ref.txt. Before we merge we modify back to master

[magnmaeh]

This looks good to me. If you want to run CI with a specific branch of lingua-franca, then write the branch name into lingua-franca-ref.txt. Before we merge we modify back to master

Hmm, the ref thing does not seem to work since my branch is on a fork as well... I can change to URL (lf-lang/lingua-franca/.github/workflows/c-flexpret-tests.yml@master) to point to my fork as well though, i.e., magnmaeh/lingua-franca/.github/workflows/c-flexpret-tests.yml@add-flexpret-support, which is valid. But that file depends on lots of other files again and fails.

Maybe its better to just try and resolve any CI issues in the main repo PR instead?

[erlingrj]

Yes, when CI passes in the PR of lingua-franca then we merge both!

[lhstrh]

Let me push out one more patch release before merging this.