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Merge branch 'bugfix/ledc_get_freq_calc' into 'master'

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fix(ledc): fix ledc_get_freq calculation err due to overflow

Closes IDF-11714, IDF-11762, IDFGH-14067, and IDFGH-14070

See merge request espressif/esp-idf!35451
This commit is contained in:
Song Ruo Jing
2024-12-11 11:59:15 +08:00
parent 56696866ba 1cd5736e75
commit aae5321c4a
4 changed files with 26 additions and 15 deletions
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7
docs/en/api-reference/peripherals/ledc.rst
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@@ -319,14 +319,13 @@ The LEDC API provides several ways to change the PWM frequency "on the fly":
More Control Over PWM
"""""""""""""""""""""
There are several lower level timer-specific functions that can be used to change PWM settings:
There are several individual timer-specific functions that can be used to change PWM output:
* :cpp:func:`ledc_timer_set`
* :cpp:func:`ledc_timer_rst`
* :cpp:func:`ledc_timer_pause`
* :cpp:func:`ledc_timer_resume`
The first two functions are called "behind the scenes" by :cpp:func:`ledc_channel_config` to provide a startup of a timer after it is configured.
The first function is called "behind the scenes" by :cpp:func:`ledc_timer_config` to provide a startup of a timer after it is configured.
Use Interrupts
@@ -356,7 +355,7 @@ If signal output needs to be maintained in Light-sleep, then select :cpp:enumera
LEDC High and Low Speed Mode
----------------------------
High speed mode enables a glitch-free changeover of timer settings. This means that if the timer settings are modified, the changes will be applied automatically on the next overflow interrupt of the timer. In contrast, when updating the low-speed timer, the change of settings should be explicitly triggered by software. The LEDC driver handles it in the background, e.g., when :cpp:func:`ledc_timer_config` or :cpp:func:`ledc_timer_set` is called.
High speed mode enables a glitch-free changeover of timer settings. This means that if the timer settings are modified, the changes will be applied automatically on the next overflow interrupt of the timer. In contrast, when updating the low-speed timer, the change of settings should be explicitly triggered by software. The LEDC driver handles it in the background, e.g., when :cpp:func:`ledc_timer_config` is called.
For additional details regarding speed modes, see **{IDF_TARGET_NAME} Technical Reference Manual** > **LED PWM Controller (LEDC)** [`PDF <{IDF_TARGET_TRM_EN_URL}#ledpwm>`__].