Added PCF8574 driver lib

src/libs/PCF8574/PCF8574.cpp

@@ -1,26 +1,32 @@
 #include "PCF8574.h"
 
-PCF8574::PCF8574(uint8_t address, TwoWire &twc) : _twc(twc),_address(address),_pinConfig(0b11111111)
+PCF8574::PCF8574(uint8_t address, TwoWire &twc) : _twc(twc), _address(address), _pinConfig(0b11111111), _pddr(0b00000000) //Inputs by default
 {
   
 }
 
-void PCF8574::begin()
+boolean PCF8574::begin()
 {
   _twc.begin();
   _twc.beginTransmission(_address);
   _twc.write(_pinConfig);
-  _twc.endTransmission();
+  return _twc.endTransmission() == 0;
 }
 
 void PCF8574::pinMode(Pin pin, boolean mode)
 {
-  uint8_t mask = mode ? ~pin : pin; //0 INPUT - 1 OUTPUT
+  uint8_t mask = mode ? pin : pin; //0 INPUT - 1 OUTPUT
 
-  if(mode)
-    _pinConfig = _pinConfig & mask;
-  else
+  if(mode)//OUTPUT
+  {
     _pinConfig = _pinConfig | mask;
+	_pddr = _pddr | pin;
+  }
+  else
+  {
+    _pinConfig = _pinConfig | mask;
+	_pddr = _pddr & ~pin;
+  }
   
   _pinConfig = _pinConfig | mask;
   _twc.beginTransmission(_address);
@@ -30,6 +36,10 @@ void PCF8574::pinMode(Pin pin, boolean mode)
 
 void PCF8574::digitalWrite(Pin pin, boolean mode)
 {
+  //We first check that the pin is an output
+  if((_pddr & pin) == 0)
+    return;
+	  
   uint8_t mask = mode ? pin : ~pin; //0 LOW, 1 HIGH
   if(mode)
     _pinConfig = _pinConfig | mask;
@@ -48,3 +58,36 @@ boolean PCF8574::digitalRead(Pin pin)
   while(_twc.available())reg = _twc.read();
   return (reg & pin) == 0 ? 0 : 1;
 }
+
+void PCF8574::digitalReadAll(boolean array[])
+{
+	uint8_t reg = 0b00000000;
+	_twc.requestFrom((uint8_t)_address,(uint8_t)1,(uint8_t)true);
+	while(_twc.available())reg = _twc.read();
+	
+	array[0] = (reg & P0) == 0 ? 0 : 1;
+	array[1] = (reg & P1) == 0 ? 0 : 1;
+	array[2] = (reg & P2) == 0 ? 0 : 1;
+	array[3] = (reg & P3) == 0 ? 0 : 1;
+	array[4] = (reg & P4) == 0 ? 0 : 1;
+	array[5] = (reg & P5) == 0 ? 0 : 1;
+	array[6] = (reg & P6) == 0 ? 0 : 1;
+	array[7] = (reg & P7) == 0 ? 0 : 1;
+}
+
+boolean PCF8574::getPinMode(Pin pin)
+{
+	return _pddr & pin == 0 ? INPUT : OUTPUT;
+}
+
+void PCF8574::getPinModeAll(boolean array[])
+{
+	array[0] = (_pddr & P0) == 0 ? INPUT : OUTPUT;
+	array[1] = (_pddr & P1) == 0 ? INPUT : OUTPUT;
+	array[2] = (_pddr & P2) == 0 ? INPUT : OUTPUT;
+	array[3] = (_pddr & P3) == 0 ? INPUT : OUTPUT;
+	array[4] = (_pddr & P4) == 0 ? INPUT : OUTPUT;
+	array[5] = (_pddr & P5) == 0 ? INPUT : OUTPUT;
+	array[6] = (_pddr & P6) == 0 ? INPUT : OUTPUT;
+	array[7] = (_pddr & P7) == 0 ? INPUT : OUTPUT;
+}

src/libs/PCF8574/PCF8574.h

@@ -15,15 +15,19 @@ class PCF8574
     enum Pin{P0 = 1, P1 = 2, P2 = 4, P3 = 8, P4 = 16, P5 = 32, P6 = 64, P7 = 128};
     
     PCF8574(uint8_t address, TwoWire &twc = Wire);
-    void begin();
+    boolean begin();
     void pinMode(Pin pin, boolean mode = INPUT);
     void digitalWrite(Pin pin, boolean mode);
     boolean digitalRead(Pin pin);
+	void digitalReadAll(boolean array[]);
+	boolean getPinMode(Pin pin);
+	void getPinModeAll(boolean array[]);
   private:
     TwoWire &_twc;
     uint8_t _address;
     uint8_t _pinConfig;
+	uint8_t _pddr;
   protected: 
 };
 
-#endif
+#endif //PCF8574_H

src/libs/PCF8574/keywords.txt

@@ -0,0 +1,27 @@
+#######################################
+# Syntax Coloring Map For RTC
+#######################################
+
+#######################################
+# Datatypes (KEYWORD1)
+#######################################
+
+PCF8574	KEYWORD1
+
+#######################################
+# Methods and Functions (KEYWORD2)
+#######################################
+
+
+#######################################
+# Constants (LITERAL1)
+#######################################
+
+P0 LITERAL1
+P1 LITERAL1
+P2 LITERAL1
+P3 LITERAL1
+P4 LITERAL1
+P5 LITERAL1
+P6 LITERAL1
+P7 LITERAL1