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Clarify analog output doc for pwm limits (#6051)

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* Update reference.rst

Clarify analogWrite and PWM limitations.

* Update reference.rst
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Develo 2019-05-05 14:22:01 -04:00 committed by Earle F. Philhower, III
parent 95fd7b55e4
commit ac53c2998e
1 changed files with 7 additions and 1 deletions
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doc/reference.rst
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@ -70,7 +70,13 @@ equal to 1023 by default. PWM range may be changed by calling
``analogWriteRange(new_range)``.
PWM frequency is 1kHz by default. Call
``analogWriteFreq(new_frequency)`` to change the frequency.
``analogWriteFreq(new_frequency)`` to change the frequency. Valid values
are from 100Hz up to 40000Hz.
The ESP doesn't have hardware PWM, so the implementation is by software.
With one PWM output at 40KHz, the CPU is already rather loaded. The more
PWM outputs used, and the higher their frequency, the closer you get to
the CPU limits, and the less CPU cycles are available for sketch execution.
Timing and delays
-----------------