#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0-or-later
# SPDX-FileCopyrightText: 2023 Kent Gibson <warthog618@gmail.com>

"""Minimal example of watching for rising edges on a single line."""

import gpiod
from gpiod.line import Edge


def watch_line_rising(chip_path: str, line_offset: int) -> None:
    with gpiod.request_lines(
        chip_path,
        consumer="watch-line-rising",
        config={line_offset: gpiod.LineSettings(edge_detection=Edge.RISING)},
    ) as request:
        while True:
            # Blocks until at least one event is available
            for event in request.read_edge_events():
                print(
                    f"line: {event.line_offset}"
                    "  type: Rising"
                    f"  event #{event.line_seqno}"
                )


if __name__ == "__main__":
    try:
        watch_line_rising("/dev/gpiochip0", 5)
    except OSError as ex:
        print(ex, "\nCustomise the example configuration to suit your situation")
