Comments! Licenses!

Moved function explanation comments to the sx1509_library.h.

Slight changes to the digitalReadWrite example.

Author: Jim Lindblom

Arduino/libraries/SX1509/examples/sx1509_digitalReadWrite/sx1509_digitalReadWrite.ino

@@ -68,30 +68,34 @@ const byte resetPin = 8;
 // Or make an sx1509 object with just the SX1509 I2C address:
 sx1509Class sx1509(SX1509_ADDRESS);
 
+// SX1509 pin defintions:
+const byte buttonPin = 1;
+const byte ledPin = 14;
+
 void setup()
 {
   Serial.begin(9600);
   sx1509.init();  // Initialize the SX1509, does Wire.begin()
-  sx1509.pinDir(1, INPUT);  // Set SX1509 pin 1 as an input
-  sx1509.writePin(1, HIGH);  // Activate pull-up
-  sx1509.pinDir(14, OUTPUT);  // Set SX1509 pin 14 as an output
+  sx1509.pinDir(buttonPin, INPUT);  // Set SX1509 pin 1 as an input
+  sx1509.writePin(buttonPin, HIGH);  // Activate pull-up
+  sx1509.pinDir(ledPin, OUTPUT);  // Set SX1509 pin 14 as an output
 
   // Blink pin 14 a few times
   for (int i=0; i<5; i++)
   {
-    sx1509.writePin(14, LOW);  // Write pin LOW
+    sx1509.writePin(ledPin, LOW);  // Write pin LOW
     delay(100);
-    sx1509.writePin(14, HIGH);  // Write pin HIGH
+    sx1509.writePin(ledPin, HIGH);  // Write pin HIGH
     delay(100);
   }
 }
 
 void loop()
 {
-  int buttonValue = sx1509.readPin(1);  // read pin 1 status
+  int buttonValue = sx1509.readPin(buttonPin);  // read pin 1 status
 
   if (buttonValue == 1)  // by default pin 14 should be high
-    sx1509.writePin(14, LOW);  // turn pin off
+    sx1509.writePin(ledPin, LOW);  // turn pin off
   else
-    sx1509.writePin(14, HIGH);  // turn pin on
-}
+    sx1509.writePin(ledPin, HIGH);  // turn pin on
+}

Arduino/libraries/SX1509/sx1509_includes/sx1509_registers.h

@@ -1,7 +1,14 @@
-/* SX1509_registers.h
+/* 
+	sx1509_registers.h
+		Register definitions for SX1509.
+	
 	by: Jim Lindblom
-	SparkFun Electronics
-	November 13, 2012
+		SparkFun Electronics
+	date: December 13, 2012
+	
+	license: Beerware. Feel free to use it, with or without attribution, in
+		your own projects. If you find it helpful, buy me a beer next time you
+		see me at the local pub.
 */
 
 #define 	REG_INPUT_DISABLE_B		0x00	//	RegInputDisableB Input buffer disable register _ I/O[15_8] (Bank B) 0000 0000