Prepare things for the event loop, also abstract gross stuff from end users

kmk/circuitpython/matrix.py

@@ -1,9 +1,10 @@
 import digitalio
 
+from kmk.common.abstract.matrix_scanner import AbstractMatrixScanner
 from kmk.common.consts import DiodeOrientation
 
 
-class MatrixScanner:
+class MatrixScanner(AbstractMatrixScanner):
     def __init__(self, cols, rows, diode_orientation=DiodeOrientation.COLUMNS):
         # A pin cannot be both a row and column, detect this by combining the
         # two tuples into a set and validating that the length did not drop
@@ -35,20 +36,7 @@ class MatrixScanner:
             pin.switch_to_input(pull=digitalio.Pull.DOWN)
 
     def _normalize_matrix(self, matrix):
-        '''
-        We always want to internally look at a keyboard as a list of rows,
-        where a "row" is a list of keycodes (columns).
-
-        This will convert DiodeOrientation.COLUMNS matrix scans into a
-        ROWS scan, so we never have to think about these things again.
-        '''
-        if self.diode_orientation == DiodeOrientation.ROWS:
-            return matrix
-
-        return [
-            [col[col_entry] for col in matrix]
-            for col_entry in range(max(len(col) for col in matrix))
-        ]
+        return super()._normalize_matrix(matrix)
 
     def raw_scan(self):
         matrix = []

kmk/circuitpython/util.py

@@ -1,7 +1,8 @@
+import sys
+import time
+
 import board
 import digitalio
-import time
-import sys
 
 
 def feather_signal_error_with_led_flash(rate=0.5):