espressif/esp-idf
1
0
Fork 1
mirror of https://github.com/espressif/esp-idf.git synced 2026-05-03 19:41:55 +02:00
Code Issues Packages Projects Releases Wiki Activity

esp_timer: remove legacy ESP32 FRC timer implementation.

Browse Source
This commit is contained in:
Marius Vikhammer
2021-12-14 19:01:19 +08:00
parent ba348f11b8
commit edb76f14d6
31 changed files with 86 additions and 643 deletions
Download Patch File Download Diff File Expand all files Collapse all files
docs/en/api-reference/system/esp_timer.rst
+3 -11
View File
@@ -1,6 +1,8 @@
High Resolution Timer
=====================
{IDF_TARGET_HR_TIMER:default = "SYSTIMER", esp32 = "LAC timer"}
Overview
--------
@@ -15,17 +17,7 @@ An interrupt level of the handler depends on the :ref:`CONFIG_ESP_TIMER_INTERRUP
``esp_timer`` set of APIs provides one-shot and periodic timers, microsecond time resolution, and 64-bit range.
Internally, ``esp_timer`` uses a 64-bit hardware timer, where the implementation depends on :ref:`CONFIG_ESP_TIMER_IMPL`. Available options are:
.. list::
:esp32: - LAC timer
:esp32: - (legacy) FRC2 timer
:not esp32: - SYSTIMER
.. only:: esp32
.. note:: The FRC2 is a legacy option for ESP32 until v4.2, a 32-bit hardware timer was used. Starting at v4.2, use the new LAC timer option instead, it has a simpler implementation, and has smaller run time overhead because software handling of timer overflow is not needed.
Internally, ``esp_timer`` uses a 64-bit hardware timer, where the implementation depends on the target. {IDF_TARGET_HR_TIMER} is used for {IDF_TARGET_NAME}.
Timer callbacks can be dispatched by two methods: