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53 lines
1.7 KiB
Python
53 lines
1.7 KiB
Python
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from datetime import datetime
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import RPi.GPIO as GPIO
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import time
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row_channels = [6, 5, 19, 13]
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column_channel = 26
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class GPIODriver():
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def __init__(self):
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GPIO.setmode(GPIO.BCM)
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GPIO.setup(row_channels, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
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GPIO.setup(column_channel, GPIO.OUT)
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def wait_for_keypress(self, timeout=60):
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self.pressed = None
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def callback_1(channel):
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# print("Pressed key 1")
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self.pressed = 1
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def callback_2(channel):
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# print("Pressed key 2")
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self.pressed = 2
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def callback_3(channel):
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# print("Pressed key 3")
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self.pressed = 3
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def callback_4(channel):
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# print("Pressed key 4")
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self.pressed = 4
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GPIO.add_event_detect(row_channels[0], GPIO.RISING, callback=callback_1, bouncetime=500)
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GPIO.add_event_detect(row_channels[1], GPIO.RISING, callback=callback_2, bouncetime=500)
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GPIO.add_event_detect(row_channels[2], GPIO.RISING, callback=callback_3, bouncetime=500)
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GPIO.add_event_detect(row_channels[3], GPIO.RISING, callback=callback_4, bouncetime=500)
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GPIO.output(column_channel, GPIO.HIGH)
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start_time = datetime.now()
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while not self.pressed:
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time.sleep(1)
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current_time = datetime.now()
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delta = current_time - start_time
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if delta.seconds > timeout:
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for chan in row_channels:
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GPIO.remove_event_detect(chan)
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GPIO.output(column_channel, GPIO.LOW)
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return None
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for chan in row_channels:
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GPIO.remove_event_detect(chan)
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GPIO.output(column_channel, GPIO.LOW)
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return self.pressed
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