Source code for wpilib.digitalsource

# validated: 2016-12-27 JW aafca4ed7fff athena/java/edu/wpi/first/wpilibj/
# Copyright (c) FIRST 2008-2012. All Rights Reserved.
# Open Source Software - may be modified and shared by FRC teams. The code
# must be accompanied by the FIRST BSD license file in the root directory of
# the project.

import hal
import weakref

from .resource import Resource
from .sensorbase import SensorBase
from .interruptablesensorbase import InterruptableSensorBase

__all__ = ["DigitalSource"]

def _freeDigitalSource(handle):

[docs]class DigitalSource(InterruptableSensorBase): """DigitalSource Interface. The DigitalSource represents all the possible inputs for a counter or a quadrature encoder. The source may be either a digital input or an analog input. If the caller just provides a channel, then a digital input will be constructed and freed when finished for the source. The source can either be a digital input or analog trigger but not both. .. not_implemented: initDigitalPort """ channels = Resource(SensorBase.kDigitalChannels) def __init__(self, channel, input): """ :param channel: Port for the digital input :type channel: int :param input: True if input, False otherwise :type input: int """ super().__init__() SensorBase.checkDigitalChannel(channel) = channel self._handle = hal.initializeDIOPort(hal.getPort(channel), input) try: DigitalSource.channels.allocate(self, channel) except IndexError as e: raise IndexError("Digital input %d is already allocated" % from e self.__finalizer = weakref.finalize(self, _freeDigitalSource, self._handle) @property def handle(self): if not self.__finalizer.alive: raise ValueError("Cannot use channel after free() has been called") return self._handle
[docs] def free(self): self.__finalizer()
[docs] def isAnalogTrigger(self): raise NotImplementedError
[docs] def getChannel(self): raise NotImplementedError