28 lines
942 B
Python
28 lines
942 B
Python
#!/usr/bin/env python3
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"""Короткий импульс на GPIO (Linux + gpiod). Пример для Orange Pi: скопируйте на устройство и укажите путь в настройках транспондера."""
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import os
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import time
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try:
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import gpiod
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except ImportError:
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raise SystemExit("Нужен пакет gpiod (python3-libgpiod)") from None
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CHIP = os.environ.get("AIS_TX_GPIO_CHIP", "/dev/gpiochip1")
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LINE = int(os.environ.get("AIS_TX_GPIO_LINE", "0"))
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PULSE_US = int(os.environ.get("AIS_TX_PULSE_US", "1000"))
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with gpiod.request_lines(
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CHIP,
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consumer="ais-tx-pulse",
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config={
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LINE: gpiod.LineSettings(
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direction=gpiod.line.Direction.OUTPUT,
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output_value=gpiod.line.Value.INACTIVE,
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)
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},
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) as req:
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req.set_value(LINE, gpiod.line.Value.ACTIVE)
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time.sleep(PULSE_US / 1_000_000.0)
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req.set_value(LINE, gpiod.line.Value.INACTIVE)
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