Adafruit_I2C/Adafruit_I2C.py

@@ -8,6 +8,7 @@
 
 class Adafruit_I2C :
 
+  @staticmethod
   def getPiRevision():
     "Gets the version number of the Raspberry Pi board"
     # Courtesy quick2wire-python-api
@@ -19,14 +20,19 @@ def getPiRevision():
             return 1 if line.rstrip()[-1] in ['1','2'] else 2
     except:
       return 0
+
+  @staticmethod
+  def getPiI2CBusNumber():
+    # Gets the I2C bus number /dev/i2c#
+    return 1 if Adafruit_I2C.getPiRevision() > 1 else 0
 
-  def __init__(self, address, bus=smbus.SMBus(1 if getPiRevision() > 1 else 0), debug=False):
+  def __init__(self, address, bus=-1, debug=False):
     self.address = address
-	# By default, the correct I2C bus is auto-detected using /proc/cpuinfo
-    self.bus = bus
-	# Alternatively, you can hard-code the bus version below:
-	# self.bus = smbus.SMBus(0); # Force I2C0 (early 256MB Pi's)
+    # By default, the correct I2C bus is auto-detected using /proc/cpuinfo
+    # Alternatively, you can hard-code the bus version below:
+    # self.bus = smbus.SMBus(0); # Force I2C0 (early 256MB Pi's)
     # self.bus = smbus.SMBus(1); # Force I2C1 (512MB Pi's)
+    self.bus = smbus.SMBus(Adafruit_I2C.getPiI2CBusNumber() if bus == -1 else bus)
     self.debug = debug
 
   def reverseByteOrder(self, data):

Adafruit_LEDBackpack/Adafruit_7Segment.py

@@ -3,6 +3,7 @@
 import time
 import datetime
 from Adafruit_LEDBackpack import LEDBackpack
+from Adafruit_I2C import Adafruit_I2C
 
 # ===========================================================================
 # 7-Segment Display
@@ -19,10 +20,10 @@ class SevenSegment:
              0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71 ]
 
   # Constructor
-  def __init__(self, address=0x70, debug=False):
+  def __init__(self, address=0x70, bus=Adafruit_I2C.getPiI2CBusNumber(), debug=False):
     if (debug):
       print "Initializing a new instance of LEDBackpack at 0x%02X" % address
-    self.disp = LEDBackpack(address=address, debug=debug)
+    self.disp = LEDBackpack(address=address, bus=bus, debug=debug)
 
   def writeDigitRaw(self, charNumber, value):
     "Sets a digit using the raw 16-bit value"

Adafruit_LEDBackpack/Adafruit_8x8.py

@@ -3,6 +3,7 @@
 import time
 import datetime
 from Adafruit_LEDBackpack import LEDBackpack
+from Adafruit_I2C import Adafruit_I2C
 
 # ===========================================================================
 # 8x8 Pixel Display
@@ -12,10 +13,10 @@ class EightByEight:
   disp = None
 
   # Constructor
-  def __init__(self, address=0x70, debug=False):
+  def __init__(self, address=0x70, bus=Adafruit_I2C.getPiI2CBusNumber(), debug=False):
     if (debug):
       print "Initializing a new instance of LEDBackpack at 0x%02X" % address
-    self.disp = LEDBackpack(address=address, debug=debug)
+    self.disp = LEDBackpack(address=address, bus=bus, debug=debug)
 
   def writeRowRaw(self, charNumber, value):
     "Sets a row of pixels using a raw 16-bit value"

Adafruit_LEDBackpack/Adafruit_LEDBackpack.py

@@ -27,8 +27,8 @@ class LEDBackpack:
               0x0000, 0x0000, 0x0000, 0x0000 ]
 
   # Constructor
-  def __init__(self, address=0x70, debug=False):
-    self.i2c = Adafruit_I2C(address)
+  def __init__(self, address=0x70, bus=Adafruit_I2C.getPiI2CBusNumber(), debug=False):
+    self.i2c = Adafruit_I2C(address, bus)
     self.address = address
     self.debug = debug
 

Adafruit_LEDBackpack/ex_7segment_clock.py

@@ -3,11 +3,21 @@
 import time
 import datetime
 from Adafruit_7Segment import SevenSegment
+from Adafruit_I2C import Adafruit_I2C
 
 # ===========================================================================
 # Clock Example
 # ===========================================================================
-segment = SevenSegment(address=0x70)
+i2CBus = Adafruit_I2C.getPiI2CBusNumber()
+
+# if using this example with a BeagleBone, uncomment the line below and specify
+# which I2C Bus the backpack is connected on. If connected to I2C1 (Header P9, 
+# pin 17 & 18) specify 1, if connected to I2C2 (Header P9, pin 19 & 20) specify 3.
+# WARNING: if using with a BeagleBone use a logic-level convertor such as this one
+# https://www.adafruit.com/products/757
+# i2CBus = 1 | 3
+
+segment = SevenSegment(address=0x70, bus=i2CBus)
 
 print "Press CTRL+Z to exit"
 

Adafruit_LEDBackpack/ex_8x8_pixels.py

@@ -3,11 +3,21 @@
 import time
 import datetime
 from Adafruit_8x8 import EightByEight
+from Adafruit_I2C import Adafruit_I2C
 
 # ===========================================================================
 # 8x8 Pixel Example
 # ===========================================================================
-grid = EightByEight(address=0x70)
+i2CBus = Adafruit_I2C.getPiI2CBusNumber()
+
+# if using this example with a BeagleBone, uncomment the line below and specify
+# which I2C Bus the backpack is connected on. If connected to I2C1 (Header P9, 
+# pin 17 & 18) specify 1, if connected to I2C2 (Header P9, pin 19 & 20) specify 3.
+# WARNING: if using with a BeagleBone use a logic-level convertor such as this one
+# https://www.adafruit.com/products/757
+# i2CBus = 1 | 3
+
+grid = EightByEight(address=0x70, bus=i2CBus)
 
 print "Press CTRL+Z to exit"