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sys/ztimer: Simplify ztimer backend selection #19684

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sys/ztimer: Simplify ztimer backend selection #19684

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MrKevinWeiss
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Contribution description

I added a test (with an informative README) that exposes a problem with the ztimer backend selection in both make and Kconfig.

This documents it, provides a test to show it, and provides a solution.

The potential issue is that some application that may have used ztimer_periph_rtt as a backend could have changed to ztimer_periph_timer.

Testing procedure

Green murdock...

Issues/PRs references

Preventing #18005 from being merged...

@github-actions github-actions bot added Area: cpu Area: CPU/MCU ports Area: doc Area: Documentation Area: Kconfig Area: Kconfig integration Area: sys Area: System Area: tests Area: tests and testing framework Area: timers Area: timer subsystems Platform: ARM Platform: This PR/issue effects ARM-based platforms Platform: AVR Platform: This PR/issue effects AVR-based platforms Platform: ESP Platform: This PR/issue effects ESP-based platforms labels May 30, 2023
@MrKevinWeiss MrKevinWeiss removed Platform: ARM Platform: This PR/issue effects ARM-based platforms Area: doc Area: Documentation Area: tests Area: tests and testing framework Platform: AVR Platform: This PR/issue effects AVR-based platforms Area: timers Area: timer subsystems Platform: ESP Platform: This PR/issue effects ESP-based platforms Area: cpu Area: CPU/MCU ports Area: sys Area: System Area: Kconfig Area: Kconfig integration labels May 30, 2023
@MrKevinWeiss MrKevinWeiss added the CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR label May 30, 2023
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riot-ci commented May 30, 2023 •
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Murdock results

❌ FAILED

2295306 fixup! sys/ztimer/Kconfig: Improve backend selection

Success Failures Total Runtime
1297 0 6947 02m:47s

Artifacts

@github-actions github-actions bot added Area: cpu Area: CPU/MCU ports Area: doc Area: Documentation Area: Kconfig Area: Kconfig integration Area: sys Area: System Area: tests Area: tests and testing framework Area: timers Area: timer subsystems Platform: ARM Platform: This PR/issue effects ARM-based platforms Platform: AVR Platform: This PR/issue effects AVR-based platforms Platform: ESP Platform: This PR/issue effects ESP-based platforms labels May 31, 2023
@MrKevinWeiss
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Seems unrelated?

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MrKevinWeiss commented Jun 1, 2023 •
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Interesting for the examples/twr_aloha failure, it is because the stk3200 used to use rtt but now uses periph_timer. As a result OS_CPUTIME_FREQ_HIGH gets set to CONFIG_ZTIMER_MSEC_BASE_FREQ (1000000) instead of RTT_FREQUENCY.
Though the error says:

#error "Invalid OS_CPUTIME_FREQ value.  Value must be one of a) a power of 2" \
       ">= 256Hz, or b) any value >= 1MHz"

The actual condition for the error is #elif MYNEWT_VAL(OS_CPUTIME_FREQ) > 1000000, which is > than not >=.

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Hmm, this error points out that we are giving up using rtt on any boards with rtc conflicts, even if the rtc is not used...

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It is actually 250000 for that board... Something due to XTIMER_HZ overriding it or something. So it should be failing.

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I think I need some feedback on how to prevent this issue... Maybe something with default modules would be better...

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Area: cpu Area: CPU/MCU ports Area: doc Area: Documentation Area: Kconfig Area: Kconfig integration Area: sys Area: System Area: tests Area: tests and testing framework Area: timers Area: timer subsystems CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR Platform: ARM Platform: This PR/issue effects ARM-based platforms Platform: AVR Platform: This PR/issue effects AVR-based platforms Platform: ESP Platform: This PR/issue effects ESP-based platforms
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