kmk-paintbrush/kmk/scanners/keypad.py

108 lines
2.7 KiB
Python
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import keypad
from kmk.scanners import DiodeOrientation, Scanner
class KeypadScanner(Scanner):
'''
Translation layer around a CircuitPython 7 keypad scanner.
:param pin_map: A sequence of (row, column) tuples for each key.
:param kp: An instance of the keypad class.
'''
@property
def key_count(self):
return self.keypad.key_count
def scan_for_changes(self):
'''
Scan for key events and return a key report if an event exists.
The key report is a byte array with contents [row, col, True if pressed else False]
'''
ev = self.keypad.events.get()
if ev and self.offset:
return keypad.Event(ev.key_number + self.offset, ev.pressed)
return ev
class MatrixScanner(KeypadScanner):
'''
Row/Column matrix using the CircuitPython 7 keypad scanner.
:param row_pins: A sequence of pins used for rows.
:param col_pins: A sequence of pins used for columns.
:param direction: The diode orientation of the matrix.
'''
def __init__(
self,
row_pins,
column_pins,
*,
columns_to_anodes=DiodeOrientation.COL2ROW,
interval=0.02,
max_events=64,
):
self.keypad = keypad.KeyMatrix(
row_pins,
column_pins,
columns_to_anodes=(columns_to_anodes == DiodeOrientation.COL2ROW),
interval=interval,
max_events=max_events,
)
super().__init__()
class KeysScanner(KeypadScanner):
'''
GPIO-per-key 'matrix' using the native CircuitPython 7 keypad scanner.
:param pins: An array of arrays of CircuitPython Pin objects, such that pins[r][c] is the pin for row r, column c.
'''
def __init__(
self,
pins,
*,
value_when_pressed=False,
pull=True,
interval=0.02,
max_events=64,
):
self.keypad = keypad.Keys(
pins,
value_when_pressed=value_when_pressed,
pull=pull,
interval=interval,
max_events=max_events,
)
super().__init__()
class ShiftRegisterKeys(KeypadScanner):
def __init__(
self,
*,
clock,
data,
latch,
value_to_latch=True,
key_count,
value_when_pressed=False,
interval=0.02,
max_events=64,
):
self.keypad = keypad.ShiftRegisterKeys(
clock=clock,
data=data,
latch=latch,
value_to_latch=value_to_latch,
key_count=key_count,
value_when_pressed=value_when_pressed,
interval=interval,
max_events=max_events,
)
super().__init__()