57 lines
1.4 KiB
Python
57 lines
1.4 KiB
Python
# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
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#
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# SPDX-License-Identifier: MIT
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"""
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`analogio` - Analog input and output control
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=================================================
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See `CircuitPython:analogio` in CircuitPython for more details.
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* Author(s): Carter Nelson
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"""
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from adafruit_blinka.microcontroller.mcp2221.pin import Pin
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from adafruit_blinka import ContextManaged
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class AnalogIn(ContextManaged):
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"""Analog Input Class"""
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def __init__(self, pin):
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self._pin = Pin(pin.id)
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self._pin.init(mode=Pin.ADC)
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@property
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def value(self):
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"""Read the ADC and return the value"""
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return self._pin.value()
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# pylint: disable=no-self-use
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@value.setter
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def value(self, value):
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# emulate what CircuitPython does
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raise AttributeError("'AnalogIn' object has no attribute 'value'")
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# pylint: enable=no-self-use
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def deinit(self):
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del self._pin
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class AnalogOut(ContextManaged):
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"""Analog Output Class"""
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def __init__(self, pin):
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self._pin = Pin(pin.id)
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self._pin.init(mode=Pin.DAC)
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@property
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def value(self):
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"""Return an error. This is output only."""
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# emulate what CircuitPython does
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raise AttributeError("unreadable attribute")
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@value.setter
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def value(self, value):
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self._pin.value(value)
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def deinit(self):
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del self._pin
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