Adolfo Reyna
71 lines
2.4 KiB
Python
71 lines
2.4 KiB
Python
import time
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from machine import Pin
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class Button:
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"""A debounced button handler supporting click and long press callbacks using Pin IRQ."""
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def __init__(self, pin_num, name="Button", debounce_ms=50, long_press_ms=800):
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self.pin = Pin(pin_num, Pin.IN, Pin.PULL_UP)
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self.name = name
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self.debounce_ms = debounce_ms
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self.long_press_ms = long_press_ms
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self.last_state = 1 # Normal high (pull-up)
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self.press_time = 0
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self.last_debounce_time = 0
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self.click_callback = None
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self.long_press_callback = None
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# Setup soft IRQ (default) to allow memory allocation and callbacks inside handler
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self.pin.irq(handler=self._handle_irq, trigger=Pin.IRQ_FALLING | Pin.IRQ_RISING)
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def is_pressed(self):
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"""Returns True if the button is currently pressed (active low)."""
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return self.pin.value() == 0
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def on_click(self, callback):
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"""Register a callback function for a single click event."""
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self.click_callback = callback
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return callback
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def on_long_press(self, callback):
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"""Register a callback function for a long press event."""
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self.long_press_callback = callback
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return callback
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def _handle_irq(self, pin):
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now = time.ticks_ms()
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val = pin.value()
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# Debounce: filter out fast state jitter
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if time.ticks_diff(now, self.last_debounce_time) < self.debounce_ms:
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return
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if val != self.last_state:
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self.last_debounce_time = now
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self.last_state = val
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if val == 0:
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# Button pressed
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self.press_time = now
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else:
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# Button released
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if self.press_time > 0:
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duration = time.ticks_diff(now, self.press_time)
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self.press_time = 0 # Reset
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if duration >= self.long_press_ms:
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if self.long_press_callback:
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self.long_press_callback()
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else:
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if self.click_callback:
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self.click_callback()
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class BoardButtons:
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"""Convenience class containing both the BOOT (Pin 0) and KEY (Pin 18) buttons."""
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def __init__(self):
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self.boot = Button(0, "BOOT")
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self.key = Button(18, "KEY")
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