cleanup and fixes

kmk/modules/potentiometer.py

@@ -5,14 +5,14 @@ from supervisor import ticks_ms
 from kmk.modules import Module
 
 class BasePotentiometer:
-    
     def __init__(self, is_inverted=False):
         self.is_inverted = is_inverted
         self.read_pin = None
-        self._state = None
         self._direction = None
-        self._pos = 0.0
+        self._pos = 0
         self._timestamp = ticks_ms()
+
+        self._truncate_bits = 6
         
         # callback function on events. Needs to be defined externally
         self.on_move_do = None
@@ -21,43 +21,46 @@ class BasePotentiometer:
         return {
             'direction': self.is_inverted and -self._direction or self._direction,
             'position': self.is_inverted and -self._pos or self._pos,
-            'velocity': self._velocity,
         }
         
-    def update_state(self):
-        new_state = self.read_pin.value
+    def get_pos(self):
+        # Debounce...
+        # AnalogRead always reports 16 bit values - truncate to 6 to de-noise
+        # convert to percentage and round to quarter of a percent
         
+        # readings = [(self.read_pin.value >> (16 - self._truncate_bits)) for i in range(3)]
+        # reading = sum(readings) / len(readings)
+
+        
+        reading = self.read_pin.value >> 10
+        dec_val = reading / (pow(2, self._truncate_bits) - 1)
+
+        # new_pos = round(dec_val * 4, 1) / 4
+        new_pos = round(dec_val, 2)
+
+        return int(new_pos * 127)
+
+    def update_state(self):    
         self._direction = 0
-        
-        if new_state != self._state:
+        new_pos = self.get_pos()
+        if abs(new_pos - self._pos) > 2:
             # movement detected!
-            # Debounce...
-            
-            # AnalogRead always reports 16 bit values
-            # convert to percentage and round to hundreths
-            new_pos = round(new_state / 0xFFFF, 2)
-            
-            if new_pos != self._pos:
-                self._pos = new_pos
-            
-                if new_state > self._state:
-                    self._direction = 1
-                else:
-                    self._direction = -1
-                    
-                if self.on_move_do is not None:
-                    self.on_move_do(self.get_state())
+            if new_pos > self._pos:
+                self._direction = 1
+            else:
+                self._direction = -1
+            self._pos = new_pos
+            if self.on_move_do is not None:
+                self.on_move_do(self.get_state())
               
 class GPIOPotentiometer(BasePotentiometer):
-    def __init__(self, pin, move_callback, is_inverted = False):
+    def __init__(self, pin, move_callback, is_inverted=False):
         super().__init__(is_inverted)
         self.read_pin = AnalogIn(pin)
-        self.update_state()
+        self._pos = self.get_pos()
         self.cb = move_callback
+        self.on_move_do = lambda state: self.cb(state)
 
-    def on_move_do(self, state):
-        self.cb(state)
-        
 class PotentiometerHandler(Module):
     def __init__(self):
         self.potentiometers = []
@@ -71,7 +74,7 @@ class PotentiometerHandler(Module):
 
     def during_bootup(self, keyboard):
         if self.pins:
-            for args in enumerate(self.pins):
+            for args in self.pins:
                 self.potentiometers.append( GPIOPotentiometer(*args) )
         return
     
@@ -79,8 +82,8 @@ class PotentiometerHandler(Module):
         '''
         Return value will be injected as an extra matrix update
         '''
-        for encoder in self.encoders:
-            encoder.update_state()
+        for potentiometer in self.potentiometers:
+            potentiometer.update_state()
 
         return keyboard