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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 watching for edges on multiple lines."""
import gpiod
from gpiod.line import Edge
def edge_type_str(event):
if event.event_type is event.Type.RISING_EDGE:
return "Rising"
if event.event_type is event.Type.FALLING_EDGE:
return "Falling"
return "Unknown"
def watch_multiple_line_values(chip_path, line_offsets):
with gpiod.request_lines(
chip_path,
consumer="watch-multiple-line-values",
config={tuple(line_offsets): gpiod.LineSettings(edge_detection=Edge.BOTH)},
) as request:
while True:
for event in request.read_edge_events():
print(
"offset: {} type: {:<7} event #{} line event #{}".format(
event.line_offset,
edge_type_str(event),
event.global_seqno,
event.line_seqno,
)
)
if __name__ == "__main__":
try:
watch_multiple_line_values("/dev/gpiochip0", [5, 3, 7])
except OSError as ex:
print(ex, "\nCustomise the example configuration to suit your situation")
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