zephyr: Use k_busy_wait if multithreading is not activated

[kvaellning]

If CONFIG_MULTITHREADING is not set, k_sleep is not defined by Zephyr.

Signed-off-by: Robert Schulze [email protected]

[kvaellning]

@nvlsianpu Then maybe just activate multi-thread mode in the prj.conf per default and generating a better error message during compile time?

[nvlsianpu]

@nvlsianpu Then maybe just activate multi-thread mode in the prj.conf per default

CONFIG_MULTITHREADING=y is by default for all with excuse to some of configuration of the nRF devices.

... and generating a better error message during compile time?

Compilation will miss for instance k_thread_create() as well. Do you think that something like error on CONFIG_MULTITHREADING=n should be added?

[kvaellning]

Compilation will miss for instance k_thread_create() as well. Do you think that something like error on CONFIG_MULTITHREADING=n should be added?

That might be the best solution. I'll update the pull request in the next time.

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