62 lines
1.9 KiB
Python
62 lines
1.9 KiB
Python
import keypad
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from kmk.matrix import DiodeOrientation
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from kmk.scanners import Scanner
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class NativeKeypadScanner(Scanner):
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'''
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Translation layer around a CircuitPython 7 keypad scanner.
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:param pin_map: A sequence of (row, column) tuples for each key.
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:param kp: An instance of the keypad class.
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'''
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def __init__(self, pin_map, kp):
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self.pin_map = pin_map
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self.keypad = kp
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self.coord_mapping = list(range(len(pin_map)))
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self.curr_event = keypad.Event()
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def scan_for_changes(self):
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'''
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Scan for key events and return a key report if an event exists.
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The key report is a byte array with contents [row, col, True if pressed else False]
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'''
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ev = self.curr_event
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has_event = self.keypad.events.get_into(ev)
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if has_event:
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return ev
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def keypad_matrix(row_pins, col_pins, direction=DiodeOrientation.COLUMNS):
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'''
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Row/Column matrix using the CircuitPython 7 keypad scanner.
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:param row_pins: A sequence of pins used for rows.
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:param col_pins: A sequence of pins used for columns.
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:param direction: The diode orientation of the matrix.
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'''
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pin_map = [
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(row, col) for row in range(len(row_pins)) for col in range(len(col_pins))
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]
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kp = keypad.KeyMatrix(
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row_pins, col_pins, columns_to_anodes=(direction == DiodeOrientation.COLUMNS)
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)
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return NativeKeypadScanner(pin_map, kp)
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def keys_scanner(pins):
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'''
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GPIO-per-key 'matrix' using the native CircuitPython 7 keypad scanner.
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:param pins: An array of arrays of CircuitPython Pin objects, such that pins[r][c] is the pin for row r, column c.
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'''
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pin_map = [(row, col) for row in range(len(pins)) for col in range(len(pins[row]))]
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kp = keypad.Keys(
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[pins[r][c] for (r, c) in pin_map], value_when_pressed=False, pull=True
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)
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return NativeKeypadScanner(pin_map, kp)
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