50 lines
1.7 KiB
Python
50 lines
1.7 KiB
Python
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import machine
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from kmk.common.abstract.matrix_scanner import AbstractMatrixScanner
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from kmk.common.consts import DiodeOrientation
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class MatrixScanner(AbstractMatrixScanner):
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def __init__(self, cols, rows, diode_orientation=DiodeOrientation.COLUMNS):
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# A pin cannot be both a row and column, detect this by combining the
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# two tuples into a set and validating that the length did not drop
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unique_pins = set(cols) | set(rows)
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if len(unique_pins) != len(cols) + len(rows):
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raise ValueError('Cannot use a pin as both a column and row')
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self.cols = [machine.Pin(pin) for pin in cols]
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self.rows = [machine.Pin(pin) for pin in rows]
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self.diode_orientation = diode_orientation
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if self.diode_orientation == DiodeOrientation.COLUMNS:
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self.outputs = self.cols
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self.inputs = self.rows
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elif self.diode_orientation == DiodeOrientation.ROWS:
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self.outputs = self.rows
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self.inputs = self.cols
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else:
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raise ValueError('Invalid DiodeOrientation: {}'.format(
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self.diode_orientation,
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))
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for pin in self.outputs:
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pin.init(machine.Pin.OUT)
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pin.off()
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for pin in self.inputs:
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pin.init(machine.Pin.IN, machine.Pin.PULL_DOWN)
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pin.off()
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def _normalize_matrix(self, matrix):
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return super()._normalize_matrix(matrix)
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def raw_scan(self):
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matrix = []
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for opin in self.outputs:
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opin.value(1)
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matrix.append([bool(ipin.value()) for ipin in self.inputs])
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opin.value(0)
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return self._normalize_matrix(matrix)
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