[riot-notifications] [RIOT-OS/RIOT] doc: XTIMER_BACKOFF inconsistency (#11522)

Francisco notifications at github.com
Fri May 17 14:41:26 CEST 2019

@SemjonKerner Thanks for your comments! 

> I would disagree, that all your findings support your proposed steps towards fixing.
>From my experience xtimer indeed becomes increasingly unreliable below 30 microseconds. I think the information for users should include microseconds instead of ticks, since it is more intuitive.

The first step I proposed was changing the documentation to ticks or us. I was hopping for discussion and did  #11538 to spark this since I don't know much about xtimer. But I probably skipped a step and should have waited for a reaction here, so I'm going back one step :)

> Also I realized there are varying redefinitions of XTIMER_BACKOFF for different boards. Assuming the developers who set this values stuck to the documentation, all those values are supposed to be microseconds, not ticks and hence should be used accordingly, instead of bloating the documentation.

Well the thing is this is not clear, since documentation is ambiguous they could have done it either way, and the way that would have worked properly is if the y used it as ticks.

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