Create Adafruit_8x8.py

Author: cameraready

Adafruit_8x8.py

@@ -0,0 +1,100 @@
+#!/usr/bin/python
+# Updated to allow for scrolling text with the Adafruit_GFX.py library
+# ColorEightByEight not updated yet.
+
+from Adafruit_LEDBackpack import LEDBackpack
+
+# ===========================================================================
+# 8x8 Pixel Display
+# ===========================================================================
+
+class EightByEight(LEDBackpack):
+  #disp = None
+  rotation = None
+
+  # Constructor
+  def __init__(self, address=0x70, debug=False):
+    if (debug):
+      print "Initializing a new instance of LEDBackpack at 0x%02X" % address
+    LEDBackpack.__init__(self, 8, 8, address, debug)
+    self.rotation = 0
+
+  def writeRowRaw(self, charNumber, value):
+    #"Sets a row of pixels using a raw 16-bit value"
+    if (charNumber > 7):
+      return
+    # Set the appropriate row
+    self.setBufferRow(charNumber, value)
+
+  def clearPixel(self, x, y):
+    #"A wrapper function to clear pixels (purely cosmetic)"
+    self.setPixel(x, y, 0)
+
+  def drawPixel(self, x, y, color=1):
+    #"Sets a single pixel"
+    if ((y < 0) or (y >= 8)):
+      return
+    if ((x < 0) or (x >= 8)):
+      return    
+      
+    # Added rotation code 4/16/13 - RH
+    if self.rotation == 1:
+      x, y = self.swap(x, y)
+      x = 8 - x - 1
+    elif self.rotation == 2:
+      x = 8 - x - 1
+      y = 8 - y - 1
+    elif self.rotation == 3:
+      x, y = self.swap(x, y)
+      y = 8 - y - 1
+
+    x += 7   # ATTN: This might be a bug?  On the color matrix, this causes x=0 to draw on the last line instead of the first.
+    x %= 8
+    # Set the appropriate pixel
+    buffer = self.getBuffer()
+    if (color):
+      self.setBufferRow(y, buffer[y] | 1 << x, False)    # disable update option to determine if writeDisplay() is called when 
+    else:                                                # writing a bunch of pixels. Speeds things up dramatically when scrolling 
+      self.setBufferRow(y, buffer[y] & ~(1 << x), False) # text on multiple matrices. Call writeDisplay() after updating buffer.
+      
+  # Used to rotate display 4/16/13 - RH
+  # Corrected for dual output 6/5/13 - RH
+  def swap(self, x, y):
+      temp = x
+      x = y
+      y = temp
+      return (x, y)
+
+  # Added 6/3/13 - RH    
+  def printMessage(self, text):
+      for letter in range(0, len(text)):
+        self.write(text[letter])
+        if (self.debug):
+            print(text[letter])
+
+class ColorEightByEight(EightByEight):
+  def setPixel(self, x, y, color=1):
+    #"Sets a single pixel"
+    if (x >= 8):
+      return
+    if (y >= 8):
+      return
+
+    x %= 8
+
+    # Set the appropriate pixel
+    buffer = self.disp.getBuffer()
+
+    # TODO : Named color constants?
+    # ATNN : This code was mostly taken from the arduino code, but with the addition of clearing the other bit when setting red or green.
+    #        The arduino code does not do that, and might have the bug where if you draw red or green, then the other color, it actually draws yellow.
+    #        The bug doesn't show up in the examples because it's always clearing.
+
+    if (color == 1):
+      self.disp.setBufferRow(y, (buffer[y] | (1 << x)) & ~(1 << (x+8)) )
+    elif (color == 2):
+      self.disp.setBufferRow(y, (buffer[y] | 1 << (x+8)) & ~(1 << x) )
+    elif (color == 3):
+      self.disp.setBufferRow(y, buffer[y] | (1 << (x+8)) | (1 << x) )
+    else:
+      self.disp.setBufferRow(y, buffer[y] & ~(1 << x) & ~(1 << (x+8)) )