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esp_timer: add documentation, expose profiling option in Kconfig

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Ivan Grokhotkov
2017-11-24 18:51:37 +08:00
parent 6e7eb3c776
commit f0547d58e4
7 changed files with 63 additions and 4 deletions
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4
components/esp32/include/esp_timer.h
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@@ -29,11 +29,11 @@
* use RTOS notification mechanisms (queues, semaphores, event groups, etc.) to
* pass information to other tasks.
*
* <to be implemented> It should be possible to request the callback to be called
* To be implemented: it should be possible to request the callback to be called
* directly from the ISR. This reduces the latency, but has potential impact on
* all other callbacks which need to be dispatched. This option should only be
* used for simple callback functions, which do not take longer than a few
* microseconds to run. </to be implemented>
* microseconds to run.
*
* Implementation note: on the ESP32, esp_timer APIs use the "legacy" FRC2
* timer. Timer callbacks are called from a task running on the PRO CPU.