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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0-or-later
# SPDX-FileCopyrightText: 2023 Kent Gibson <warthog618@gmail.com>
"""Minimal example of finding a line with the given name."""
import gpiod
import os
def generate_gpio_chips():
for entry in os.scandir("/dev/"):
if gpiod.is_gpiochip_device(entry.path):
yield entry.path
def find_line_by_name(line_name):
# Names are not guaranteed unique, so this finds the first line with
# the given name.
for path in generate_gpio_chips():
with gpiod.Chip(path) as chip:
try:
offset = chip.line_offset_from_id(line_name)
print("{}: {} {}".format(line_name, chip.get_info().name, offset))
return
except OSError:
# An OSError is raised if the name is not found.
continue
print("line '{}' not found".format(line_name))
if __name__ == "__main__":
try:
find_line_by_name("GPIO19")
except OSError as ex:
print(ex, "\nCustomise the example configuration to suit your situation")
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