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Diffstat (limited to 'docs/esp32/quickref.rst')
| -rw-r--r-- | docs/esp32/quickref.rst | 35 |
1 files changed, 24 insertions, 11 deletions
diff --git a/docs/esp32/quickref.rst b/docs/esp32/quickref.rst index ccc01099d..707ae27c0 100644 --- a/docs/esp32/quickref.rst +++ b/docs/esp32/quickref.rst @@ -393,7 +393,7 @@ Use the :ref:`machine.PWM <machine.PWM>` class:: pwm0.duty(256) # set duty cycle from 0 to 1023 as a ratio duty/1023, (now 25%) duty_u16 = pwm0.duty_u16() # get current duty cycle, range 0-65535 - pwm0.duty_u16(2**16*3//4) # set duty cycle from 0 to 65535 as a ratio duty_u16/65535, (now 75%) + pwm0.duty_u16(65536*3//4) # set duty cycle from 0 to 65535 as a ratio duty_u16/65535, (now 75%) duty_ns = pwm0.duty_ns() # get current pulse width in ns pwm0.duty_ns(250_000) # set pulse width in nanoseconds from 0 to 1_000_000_000/freq, (now 25%) @@ -402,19 +402,32 @@ Use the :ref:`machine.PWM <machine.PWM>` class:: pwm2 = PWM(Pin(2), freq=20000, duty=512) # create and configure in one go print(pwm2) # view PWM settings + pwm2.deinit() # turn off PWM on the pin + + pwm0 = PWM(Pin(0), duty_u16=16384) # The output is at a high level 25% of the time. + pwm2 = PWM(Pin(2), duty_u16=16384, invert=1) # The output is at a low level 25% of the time. + + pwm4 = PWM(Pin(4), lightsleep=True) # Allow PWM during light sleep mode 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 PWM frequencies (groups * timers) 8 4 4 -Total PWM channels (Pins, duties) (groups * channels) 16 8 6 -===================================================== ======== ======== ======== +======================================================= ======== ========= ========== +Hardware specification ESP32 ESP32-S2, ESP32-C2, + ESP32-S3, ESP32-C3, + ESP32-P4 ESP32-C5, + ESP32-C6, + ESP32-H2 +------------------------------------------------------- -------- --------- ---------- +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 PWM frequencies = (groups * timers) 8 4 4 +Total PWM channels (Pins, duties) = (groups * channels) 16 8 6 +======================================================= ======== ========= ========== + +In light sleep, the ESP32 PWM can only operate in low speed mode, so only 4 timers and +8 channels are available. 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 |