(borked previous commit, probably will again..)

Added ColorEightByEight class and example program for Adafruit Bicolor LED Square Pixel Matrix with I2C Backpack

Added note about possible pixel indexing bug in the non-color version.  I don't have the non-color version to test with.

Added note about possible unintentional color "blending" bug in the Arduino color version.

Author: mprice

Adafruit_LEDBackpack/Adafruit_8x8.py

@@ -33,8 +33,8 @@ def setPixel(self, x, y, color=1):
     if (x >= 8):
       return
     if (y >= 8):
-      return
-    x += 7
+      return    
+    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.disp.getBuffer()
@@ -47,3 +47,29 @@ def clear(self):
     "Clears the entire display"
     self.disp.clear()
 
+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)) )

Adafruit_LEDBackpack/ex_8x8_color_pixels.py

@@ -17,15 +17,7 @@
 while(True):
   iter += 1
 
-  print (iter % 4)
-
   for x in range(0, 8):
     for y in range(0, 8):
-      grid.setPixel(x, y, iter%4 )
+      grid.setPixel(x, y, iter % 4 )
       time.sleep(0.02)
-
-# I think there is another bug here that drawing red or green after yellow doesn't clear the other component until you draw a blank
-
-#  time.sleep(0.5)
-#  grid.clear()
-#  time.sleep(0.5)