mirror of
https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git
synced 2026-10-24 00:48:53 +03:00
485b81cd4b
* Sort imports * Use f-strings where possible * Remove usage of `tuple` for config key values Signed-off-by: Vincent Fazio <vfazio@gmail.com> Link: https://patch.msgid.link/20260401001459.19159-7-vfazio@gmail.com Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
40 lines
1.1 KiB
Python
Executable File
40 lines
1.1 KiB
Python
Executable File
#!/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 os
|
|
from collections.abc import Generator
|
|
|
|
import gpiod
|
|
|
|
|
|
def generate_gpio_chips() -> Generator[str]:
|
|
for entry in os.scandir("/dev/"):
|
|
if gpiod.is_gpiochip_device(entry.path):
|
|
yield entry.path
|
|
|
|
|
|
def find_line_by_name(line_name: str) -> None:
|
|
# 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(f"{line_name}: {chip.get_info().name} {offset}")
|
|
return
|
|
except OSError:
|
|
# An OSError is raised if the name is not found.
|
|
continue
|
|
|
|
print(f"line '{line_name}' not found")
|
|
|
|
|
|
if __name__ == "__main__":
|
|
try:
|
|
find_line_by_name("GPIO19")
|
|
except OSError as ex:
|
|
print(ex, "\nCustomise the example configuration to suit your situation")
|