countio – Support for edge counting

The countio module contains logic to read and count edge transitions

For more information on the applications of counting edges, see this Learn Guide on sequential circuits.

All classes change hardware state and should be deinitialized when they are no longer needed if the program continues after use. To do so, either call deinit() or use a context manager. See Lifetime and ContextManagers for more info.

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class countio.Edge

Enumerates which signal transitions can be counted.

Enum-like class to define which signal transitions to count.

RISE: Edge

Count the rising edges.

FALL: Edge

Count the falling edges.

RISE_AND_FALL: Edge

Count the rising and falling edges.

Limitations: RISE_AND_FALL is not available to RP2040 due to hardware limitations.

class countio.Counter(pin: microcontroller.Pin, *, edge: Edge = Edge.FALL, pull: digitalio.Pull | None = None)

Count the number of rising- and/or falling-edge transitions on a given pin.

Create a Counter object associated with the given pin that counts rising- and/or falling-edge transitions. At least one of rise and fall must be True. The default is to count only falling edges, and is for historical backward compatibility.

Parameters:
  • pin (Pin) – pin to monitor

  • edge (Edge) – which edge transitions to count

  • pull (Optional[digitalio.Pull]) – enable a pull-up or pull-down if not None

For example:

import board
import countio

# Count rising edges only.
pin_counter = countio.Counter(board.D1, edge=countio.Edge.RISE)
# Reset the count after 100 counts.
while True:
    if pin_counter.count >= 100:
        pin_counter.reset()
    print(pin_counter.count)

Limitations: On RP2040, Counter uses the PWM peripheral, and is limited to using PWM channel B pins due to hardware restrictions. See the pin assignments for your board to see which pins can be used.

count: int

The current count in terms of pulses.

deinit() None

Deinitializes the Counter and releases any hardware resources for reuse.

__enter__() Counter

No-op used by Context Managers.

__exit__() None

Automatically deinitializes the hardware when exiting a context. See Lifetime and ContextManagers for more info.

reset() None

Resets the count back to 0.