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docs/esp32: Explain ESP32 PWM modes, timers, and channels.

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IhorNehrutsa
2021-09-19 00:41:42 +03:00
committed by Damien George
parent 52636fa692
commit 71111cffba
3 changed files with 93 additions and 4 deletions
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docs/esp32/quickref.rst
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@@ -16,7 +16,7 @@ working with this board it may be useful to get an overview of the microcontroll
:maxdepth: 1
general.rst
tutorial/intro.rst
tutorial/index.rst
Installing MicroPython
----------------------
@@ -225,13 +225,31 @@ Use the ``machine.PWM`` class::
from machine import Pin, PWM
pwm0 = PWM(Pin(0)) # create PWM object from a pin
pwm0.freq() # get current frequency
pwm0.freq() # get current frequency (default 5kHz)
pwm0.freq(1000) # set frequency
pwm0.duty() # get current duty cycle
pwm0.duty() # get current duty cycle (default 512, 50%)
pwm0.duty(200) # set duty cycle
pwm0.deinit() # turn off PWM on the pin
pwm2 = PWM(Pin(2), freq=20000, duty=512) # create and configure in one go
pwm2 = PWM(Pin(2), freq=20000, duty=512) # create and configure in one go
ESP chips have different hardware peripherals:
===================================================== ======== ======== ========
Hardware specification ESP32 ESP32-S2 ESP32-C3
----------------------------------------------------- -------- -------- --------
Number of groups (speed modes) 2 1 1
Number of timers per group 4 4 4
Number of channels per group 8 8 6
----------------------------------------------------- -------- -------- --------
Different of PWM frequencies (groups * timers) 8 4 4
Total PWM channels (Pins, duties) (groups * channels) 16 8 6
===================================================== ======== ======== ========
A maximum number of PWM channels (Pins) are available on the ESP32 - 16 channels,
but only 8 different PWM frequencies are available, the remaining 8 channels must
have the same frequency. On the other hand, 16 independent PWM duty cycles are
possible at the same frequency.
ADC (analog to digital conversion)
----------------------------------