mirror of https://github.com/akuker/RASCSI.git
46 lines
1.6 KiB
Python
46 lines
1.6 KiB
Python
"""Module containing an implementation for reading the rotary encoder directions through
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the i2c multiplexer + interrupt"""
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from ctrlboard_hw.hardware_button import HardwareButton
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class Encoder:
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"""Class implementing a detection mechanism to detect the rotary encoder directions
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through the i2c multiplexer + interrupt"""
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def __init__(self, enc_a: HardwareButton, enc_b: HardwareButton):
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self.enc_a = enc_a
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self.enc_b = enc_b
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self.pos = 0
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self.state = 0b00000000
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self.direction = 0
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def update(self):
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"""Updates the internal attributes wrt. to the encoder position and direction."""
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value_enc_a = self.enc_a.state_interrupt
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value_enc_b = self.enc_b.state_interrupt
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self.direction = 0
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state = self.state & 0b00111111
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if value_enc_a:
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state |= 0b01000000
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if value_enc_b:
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state |= 0b10000000
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# clockwise pattern detection
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if (state == 0b11010010 or state == 0b11001000 or state == 0b11011000 or
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state == 0b11010001 or state == 0b11011011 or state == 0b11100000 or
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state == 0b11001011):
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self.pos += 1
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self.direction = 1
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self.state = 0b00000000
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return
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# counter-clockwise pattern detection
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elif (state == 0b11000100 or state == 0b11100100 or state == 0b11100001 or
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state == 0b11000111 or state == 0b11100111):
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self.pos -= 1
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self.direction = -1
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self.state = 0b00000000
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return
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self.state = state >> 2
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