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Hello,
If you violate RTX's rule that you are not to mix the interval and delay timers (thus a task that needs to wake-up at a certain interval is blocked), RTX will try to fix the periodic task's schedule but waking it up sooner that expected. It might take anything between 1 and 10 cycles until the original period is restored. It is possible to call "os_itv_set" again to fix it immediately, though.
I think you mean, "violate RTX's rule(s)" ? for sure ;-)