Updated readme and some comments

Author: Lauszus

README.md

@@ -66,8 +66,9 @@ By default serial debugging is disabled. To turn it on simply change ```ENABLE_U
 Currently the following boards are supported by the library:
 
 * All official Arduino AVR boards (Uno, Duemilanove, Mega, Mega 2560, Mega ADK, Leonardo etc.)
-* Teensy (Teensy++ 1.0, Teensy 2.0, Teensy++ 2.0, and Teensy 3.0)
-	* Note if you are using the Teensy 3.0 you should download this SPI library as well: <https://github.com/xxxajk/spi4teensy3>. You should then add ```#include <spi4teensy3.h>``` to your .ino file.
+* Arduino Due
+* Teensy (Teensy++ 1.0, Teensy 2.0, Teensy++ 2.0, and Teensy 3.x)
+	* Note if you are using the Teensy 3.x you should download this SPI library as well: <https://github.com/xxxajk/spi4teensy3>. You should then add ```#include <spi4teensy3.h>``` to your .ino file.
 * Balanduino
 * Sanguino
 * Black Widdow

avrpins.h

@@ -823,15 +823,17 @@ MAKE_PIN(P33, CORE_PIN33_PORTREG, CORE_PIN33_BIT, CORE_PIN33_CONFIG);
 
 #elif defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)
 
-// Disable interrupts
-// Enable the pull up resistor
-// Set to INPUT
-// Enable PIO
-
-// Disable interrupts
-// Disable the pull up resistor
-// Set to OUTPUT
-// Enable PIO
+// SetDirRead:
+//   Disable interrupts
+//   Enable the pull up resistor
+//   Set to INPUT
+//   Enable PIO
+
+// SetDirWrite:
+//   Disable interrupts
+//   Disable the pull up resistor
+//   Set to OUTPUT
+//   Enable PIO
 
 #define MAKE_PIN(className, baseReg, pinMask) \
 class className { \