modify: DI 输入监听
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""IN1 (12V 输入) 事件监听。
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背景：
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IN1 在硬件上接到某条 GPIO，但那条 GPIO 已被内核 gpio-keys 驱动占用，
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/sys/class/gpio 导不出来。驱动把它映射到 /dev/input/event1，
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上报键码 KEY_UP (103)。
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本机光耦输入是反相的：施加 12V 时 GPIO 被拉低，驱动上报“释放”(0)；
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撤除 12V 时 GPIO 被上拉，驱动上报“按下”(1)。
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因此默认 active_low=True，把语义翻回来，让“加 12V = 有电”。
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本模块只做一件事：盯着 IN1，有电/断电时回调。
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依赖：仅标准库。
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"""
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import argparse
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import datetime
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import glob
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import os
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import select
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import struct
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import subprocess
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import sys
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import time
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# ---- input 事件协议 ----
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EV_KEY = 0x01
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EVENT_STRUCT = struct.Struct("llHHi") # aarch64 / x86_64 都是 24 字节
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KEY_UP = 103
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VALUE_RELEASE = 0
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VALUE_PRESS = 1
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VALUE_REPEAT = 2
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DEFAULT_DEVICE = "/dev/input/event1"
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def now():
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return datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f")[:-3]
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def find_event_device(name="gpio-keys"):
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"""按设备名找 eventN，找不到返回 None。设备号变化时很有用。"""
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for path in sorted(glob.glob("/dev/input/event*")):
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ev = path.rsplit("/", 1)[-1]
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namefile = "/sys/class/input/%s/device/name" % ev
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try:
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with open(namefile) as f:
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if f.read().strip() == name:
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return path
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except OSError:
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continue
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return None
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class IN1Listener:
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"""监听 IN1，有电/断电触发回调。
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active_low=True（默认）：驱动上报“释放”(0) 视为有电，“按下”(1) 视为断电。
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适配本机光耦反相电路。
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active_low=False： 按驱动原始语义，value=1 视为有电。
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用法：
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def on_press(ts): print("IN1 有电", ts)
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def on_release(ts): print("IN1 断电", ts)
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with IN1Listener(on_press=on_press, on_release=on_release) as lis:
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lis.run() # 阻塞，Ctrl-C 退出
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# lis.run(duration=10) # 跑 10 秒后返回
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"""
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def __init__(self, device=DEFAULT_DEVICE, key=KEY_UP,
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on_press=None, on_release=None,
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on_event=None, log=None,
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active_low=True):
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self.device = device
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self.key = key
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self.on_press = on_press # 12V 接通
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self.on_release = on_release # 12V 撤除
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self.on_event = on_event # 原始事件 (ts, code, value)，可选
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self.log = log or (lambda msg: print(msg, flush=True))
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self.active_low = active_low
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self.fd = None
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self.buf = b""
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# ---- 生命周期 ----
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def open(self):
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if self.fd is None:
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self.fd = os.open(self.device, os.O_RDONLY | os.O_NONBLOCK)
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def close(self):
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if self.fd is not None:
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try:
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os.close(self.fd)
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finally:
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self.fd = None
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def __enter__(self):
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self.open()
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return self
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def __exit__(self, *exc):
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self.close()
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# ---- 事件处理 ----
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def _drain(self):
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if self.fd is None:
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return
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try:
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data = os.read(self.fd, EVENT_STRUCT.size * 64)
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except OSError:
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return
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self.buf += data
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while len(self.buf) >= EVENT_STRUCT.size:
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chunk, self.buf = self.buf[:EVENT_STRUCT.size], self.buf[EVENT_STRUCT.size:]
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sec, usec, etype, code, value = EVENT_STRUCT.unpack(chunk)
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if etype != EV_KEY:
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continue
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ts = sec + usec / 1e6
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if self.on_event:
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self.on_event(ts, code, value)
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if code != self.key:
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continue
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if value == VALUE_REPEAT:
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self.log("%s IN1 重复" % now())
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continue
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# 硬件极性：active_low 时，value=0 表示 12V 接通
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if self.active_low:
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powered = (value == VALUE_RELEASE)
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else:
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powered = (value == VALUE_PRESS)
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if powered:
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self.log("%s IN1 有电" % now())
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if self.on_press:
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self.on_press(ts)
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else:
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self.log("%s IN1 断电" % now())
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if self.on_release:
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self.on_release(ts)
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# ---- 主循环 ----
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def run(self, duration=None):
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"""阻塞监听。duration 秒后返回；None = 一直跑到 Ctrl-C。"""
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if self.fd is None:
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self.open()
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if self.fd is None:
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return
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poller = select.poll()
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poller.register(self.fd, select.POLLIN)
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deadline = time.time() + duration if duration else None
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while True:
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timeout = 500 # ms
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if deadline:
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remain = deadline - time.time()
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if remain <= 0:
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return
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timeout = int(min(remain, 0.5) * 1000)
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poller.poll(timeout)
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self._drain()
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# ---- CLI 演示 ----
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def main():
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ap = argparse.ArgumentParser(description="监听 IN1 (12V 输入)")
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ap.add_argument("-d", "--device", default=DEFAULT_DEVICE,
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help="事件设备，默认 %(default)s；传 auto 自动按名字查找")
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ap.add_argument("-k", "--key", type=lambda s: int(s, 0), default=KEY_UP,
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help="键码，默认 103 (KEY_UP)")
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ap.add_argument("-t", "--duration", type=float, default=0,
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help="监听秒数，0 = 一直跑")
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ap.add_argument("--press-command", help="IN1 有电时执行的 shell 命令")
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ap.add_argument("--release-command", help="IN1 断电时执行的 shell 命令")
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ap.add_argument("--active-low", dest="active_low", action="store_true",
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default=True,
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help="12V 接通上报为“有电”（默认，适配本机光耦反相）")
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ap.add_argument("--no-active-low", dest="active_low", action="store_false",
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help="不翻转，按驱动原始语义")
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args = ap.parse_args()
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device = args.device
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if device == "auto":
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device = find_event_device("gpio-keys") or DEFAULT_DEVICE
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def run_cmd(cmd):
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if cmd:
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subprocess.Popen(cmd, shell=True)
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with IN1Listener(
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device=device,
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key=args.key,
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active_low=args.active_low,
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on_press=lambda ts: run_cmd(args.press_command),
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on_release=lambda ts: run_cmd(args.release_command),
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) as lis:
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print("监听 %s key=%d active_low=%s，Ctrl-C 退出"
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% (device, args.key, args.active_low), flush=True)
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try:
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lis.run(duration=args.duration or None)
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except KeyboardInterrupt:
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print("\n退出。")
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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