adding files

RPi/fake_smbus.py

@@ -0,0 +1,37 @@
+import tkinter as tk
+
+encoders = []
+class SMBus:
+    def __init__(self, bus):
+        print(f"fake SMBus initialized on bus {bus}")
+        self.bus = bus
+        
+
+    def read_i2c_block_data(self, addr, cmd, length):
+        data = []
+        for encoder in encoders:
+            pos_as_byte_array = encoder.get_position().to_bytes(2, 'little', signed=True)
+            data.append(pos_as_byte_array[0])
+            data.append(pos_as_byte_array[1])
+            
+        #print(f"SMBus data set to: {data}")
+        return data
+
+def createTestEncoder():
+    encoder = TestEncoder()
+    encoders.append(encoder)
+    return encoder
+          
+class TestEncoder:
+    """ represent a test encoder controlled by keyboard input """
+    def __init__(self):
+        self._position = 0
+        
+    def _rotate_cw(self, event=None):
+        self._position += 1
+
+    def _rotate_ccw(self, event=None):
+        self._position -= 1
+
+    def get_position(self) -> int:
+        return self._position