Fix default address, read.

Author: tdicola

adafruit_mcp4725.py

@@ -35,7 +35,7 @@
 
 
 # Internal constants:
-_MCP4725_DEFAULT_ADDRESS = const(0b01100000)
+_MCP4725_DEFAULT_ADDRESS = const(0b01100010)
 _MCP4725_WRITE_FAST_MODE = const(0b00000000)
 
 
@@ -92,7 +92,7 @@ def _read(self):
             dac_high = self._BUFFER[1]
             dac_low = self._BUFFER[2] >> 4
             # Reconstruct 12-bit value and return it.
-            return ((dac_high << 8) | dac_low) & 0xFFF
+            return ((dac_high << 4) | dac_low) & 0xFFF
         finally:
             # Ensure bus is always unlocked.
             self._i2c.unlock()

examples/simpletest.py

@@ -33,8 +33,10 @@
 # Main loop will go up and down through the range of DAC values forever.
 while True:
     # Go up the 12-bit raw range.
+    print('Going up 0-3.3V...')
     for i in range(4095):
         dac.raw_value = i
     # Go back down the 12-bit raw range.
+    print('Going down 3.3-0V...')
     for i in range(4095, -1, -1):
         dac.raw_value = i