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Diffstat (limited to 'docs/esp32')
| -rw-r--r-- | docs/esp32/quickref.rst | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/docs/esp32/quickref.rst b/docs/esp32/quickref.rst index 49f546a17..7127cc402 100644 --- a/docs/esp32/quickref.rst +++ b/docs/esp32/quickref.rst @@ -566,6 +566,27 @@ ESP32 S2: Provided to deinit the adc driver. +Pulse Counter (pin pulse/edge counting) +--------------------------------------- + +The ESP32 provides up to 8 pulse counter peripherals depending on the hardware, +with id 0..7. These can be configured to count rising and/or falling edges on +any input pin. + +Use the :ref:`esp32.PCNT <esp32.PCNT>` class:: + + from machine import Pin + from esp32 import PCNT + + counter = PCNT(0, pin=Pin(2), rising=PCNT.INCREMENT) # create counter + counter.start() # start counter + count = counter.value() # read count, -32768..32767 + counter.value(0) # reset counter + count = counter.value(0) # read and reset + +The PCNT hardware supports monitoring multiple pins in a single unit to +implement quadrature decoding or up/down signal counters. + Software SPI bus ---------------- |