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571cf9364a
This commit applies a number of improvements to the logic used when trying to drop to a CC13xx/CC26xx low-power mode: * We identify whether there are any pending etimers by using `etimer_pending()` instead of `etimer_next_expiration_time()`. This subsequently allows us to also identify whether an etimer is set to fire at time 0. * We run a larger portion of the code with the global interrupt disabled. This prevents a number of messy conditions that can occur if an interrupt fires after we have started the low-power sequence. * We check whether there are pending events earlier in the sequence. * We make sure to schedule a next wakeup event even when an LPM module prohibits deep sleep and forces sleep instead. This fixes some of the issues discussed in #1236