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15b94c53ed
This adds a new Gpio helper class, which uses libgpiod under the hood instead of the deprecated sysfs GPIO access. This class provides the ability to get/set a specific GPIO, which is looked up by name.
60 lines
1.4 KiB
Python
60 lines
1.4 KiB
Python
#
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# Copyright 2020 Ettus Research, a National Instruments Brand
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#
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# SPDX-License-Identifier: GPL-3.0-or-later
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#
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"""
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Access to GPIOs via libgpiod
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"""
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import contextlib
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import gpiod
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@contextlib.contextmanager
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def request_gpio(line, direction):
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"""
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Context manager for a GPIO line
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"""
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line.request(consumer='mpm', type=direction)
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try:
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yield line
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finally:
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line.release()
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class Gpio:
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"""
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Class for accessing a named GPIO line via libgpiod
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"""
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INPUT = gpiod.LINE_REQ_DIR_IN
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OUTPUT = gpiod.LINE_REQ_DIR_OUT
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def __init__(self, name, direction=INPUT, default_val=None):
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self._direction = direction
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self._line = gpiod.find_line(name)
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self._out_value = False
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if self._line is None:
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raise RuntimeError('failed to find gpio with name %s' % name)
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if default_val is not None and direction == Gpio.OUTPUT:
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self.set(default_val)
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def get(self):
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"""
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Read the value of this GPIO
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"""
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if self._direction == self.OUTPUT:
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return self._out_value
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with request_gpio(self._line, self._direction) as gpio:
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return bool(gpio.get_value())
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def set(self, value):
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"""
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Set the value of this GPIO
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"""
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with request_gpio(self._line, self._direction) as gpio:
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gpio.set_value(int(value))
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self._out_value = bool(value)
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