93 lines
2.8 KiB
Python
93 lines
2.8 KiB
Python
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"""GPIO service for Pi Zero - edge-triggered monitoring.
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Polls GPIO pins and exposes state changes for inclusion in other payloads.
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Keeps UART separate (handled by arduino_service).
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"""
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import gevent
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try:
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import RPi.GPIO as GPIO
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_GPIO_AVAILABLE = True
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except ImportError:
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_GPIO_AVAILABLE = False
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print("[GPIO] RPi.GPIO not available - running in mock mode")
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# Pin assignments
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PIN_THEME_SWITCH = 20 # Physical switch for light/dark theme
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class GPIOService:
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"""Monitors GPIO pins and tracks state changes."""
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def __init__(self):
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self._running = False
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self._greenlet = None
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# Theme switch state
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self._theme_switch_state = False # False = light, True = dark
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self._theme_switch_pending = None # None = no change, bool = new value
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if _GPIO_AVAILABLE:
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GPIO.setmode(GPIO.BCM)
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GPIO.setwarnings(False)
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# Input with software pull-down (belt + suspenders with hardware pulldown)
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GPIO.setup(PIN_THEME_SWITCH, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
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def start(self):
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"""Start background polling."""
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if self._running:
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return
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self._running = True
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# Read initial state
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if _GPIO_AVAILABLE:
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self._theme_switch_state = GPIO.input(PIN_THEME_SWITCH) == GPIO.HIGH
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else:
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self._theme_switch_state = True # Mock: default dark
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self._greenlet = gevent.spawn(self._poll_loop)
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print(f"[GPIO] Started, theme_switch initial={self._theme_switch_state}")
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def stop(self):
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"""Stop background polling."""
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self._running = False
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if self._greenlet:
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self._greenlet.kill()
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self._greenlet = None
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if _GPIO_AVAILABLE:
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GPIO.cleanup([PIN_THEME_SWITCH])
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def _poll_loop(self):
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"""Poll GPIO at ~20Hz, detect edges."""
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while self._running:
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gevent.sleep(0.05) # 20Hz
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if _GPIO_AVAILABLE:
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current = GPIO.input(PIN_THEME_SWITCH) == GPIO.HIGH
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else:
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current = self._theme_switch_state # Mock: no change
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if current != self._theme_switch_state:
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self._theme_switch_state = current
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self._theme_switch_pending = current
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print(f"[GPIO] Theme switch changed to {current}")
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def get_theme_switch_change(self):
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"""Get pending theme switch change, if any.
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Returns:
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bool or None: New state if changed since last call, None otherwise.
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"""
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if self._theme_switch_pending is not None:
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value = self._theme_switch_pending
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self._theme_switch_pending = None
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return value
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return None
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@property
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def theme_switch(self):
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"""Current theme switch state (True = dark, False = light)."""
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return self._theme_switch_state
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