Ivan Grokhotkov 1af6384349 esp_timer: lock-free implementation of esp_timer_get_time ...

The implementation of esp_timer_get_time used a critical section, which
resulted in a call time of ~1.8us. To make esp_timer_get_time more
useable as a high-resolution time source, this change replaces the lock
with polling. Call time is reduced to ~0.7us.

2017-09-01 10:34:36 +08:00

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