Added ADC API docs, fixed UART module definition

Author: dplanella

docs/index.rst

@@ -103,6 +103,8 @@ Example::
          ser.write("Hello World!")
     ser.close()
 
+.. module:: Adafruit_BBIO.UART
+
 .. function:: setup_uart(channel)
 
    Set up and start the UART channel. This function will effectively export
@@ -117,6 +119,38 @@ Example::
 
    Cleans up the UART.
 
+:mod:`ADC` --- A/D Converter input interface
+--------------------------------------------
+
+This module enables reading analog input values from the analog to digital
+converter (ADC) on the Beaglebone processor.
+
+Example::
+
+    import Adafruit_BBIO.ADC as ADC
+
+    ADC.setup()
+
+    # The read method returns normalized values from 0 to 1.0
+    value = ADC.read("P9_40")
+
+    # The read_raw returns non-normalized values
+    value = ADC.read_raw("P9_40")
+
+.. module:: Adafruit_BBIO.ADC
+
+.. function:: setup_adc()
+
+   Setup and start the ADC hardware.
+
+.. function:: setup_read()
+
+   Read the normalized 0-1.0 analog value for the channel.
+
+.. function:: setup_read_raw()
+
+   Read the raw analog value for the channel.
+
 
 Indices and tables
 ==================