Adding sink flag to ledDriverInit

Author: Jim Lindblom

src/sx1509_library.cpp

@@ -151,7 +151,7 @@ byte sx1509Class::readPin(byte pin)
 	return 0;
 }
 
-void sx1509Class::ledDriverInit(byte pin, byte freq, bool log)
+void sx1509Class::ledDriverInit(byte pin, byte freq, bool log, bool sink)
 {
 	unsigned int tempWord;
 	byte tempByte;
@@ -167,11 +167,14 @@ void sx1509Class::ledDriverInit(byte pin, byte freq, bool log)
 	tempWord &= ~(1<<pin);
 	writeWord(REG_PULL_UP_B, tempWord);
 
-	// Enable open-drain
-	// Writing a 1 to the pin bit will enable open drain on that pin
-	tempWord = readWord(REG_OPEN_DRAIN_B);
-	tempWord |= (1<<pin);
-	writeWord(REG_OPEN_DRAIN_B, tempWord);
+	if (sink)
+	{
+		// Enable open-drain
+		// Writing a 1 to the pin bit will enable open drain on that pin
+		tempWord = readWord(REG_OPEN_DRAIN_B);
+		tempWord |= (1<<pin);
+		writeWord(REG_OPEN_DRAIN_B, tempWord);
+	}
 
 	// Set direction to output (REG_DIR_B)
 	pinDir(pin, OUTPUT);

src/sx1509_library.h

@@ -148,7 +148,7 @@ class sx1509Class
 //			- currently log sets both bank A and B to the same mode
 //	Note: this function automatically decides to use the internal 2MHz osc.
 // -----------------------------------------------------------------------------
-	void ledDriverInit(byte pin, byte freq = 1, bool log = 0);
+	void ledDriverInit(byte pin, byte freq = 1, bool log = false, bool sink = false);
 
 // -----------------------------------------------------------------------------
 // pwm(byte pin, byte iOn):	This function can be used to control the intensity