2 files changed, 123 insertions, 0 deletions
diff --git a/lib/Arduino_I2C_Port_Expander/src/Arduino_I2C_Port_Expander.cpp b/lib/Arduino_I2C_Port_Expander/src/Arduino_I2C_Port_Expander.cpp
new file mode 100644
index 0000000..70470e9
--- /dev/null
+++ b/lib/Arduino_I2C_Port_Expander/src/Arduino_I2C_Port_Expander.cpp
@@ -0,0 +1,92 @@
+#include "Arduino_I2C_Port_Expander.h" //include the declaration for this class
+
+byte io_DataPacket[3];
+byte io_pin;
+byte io_method;
+byte io_value;
+uint8_t _addr;
+  
+//<<constructor>>
+EXPAND::EXPAND(uint8_t addr){
+  _addr = addr;
+}
+
+//<<destructor>>
+EXPAND::~EXPAND(){/*nothing to destruct*/}
+
+void EXPAND::digitalWrite(byte pin,byte val){
+  io_DataPacket[0] = 1;    // method
+  io_DataPacket[1] = pin;  // pin
+  io_DataPacket[2] = val;  // val
+  sendDataPacket();
+  int received = receiveResponse();
+}
+
+int EXPAND::digitalRead(byte pin){
+  io_DataPacket[0] = 2;    // method
+  io_DataPacket[1] = pin;  // pin
+  sendDataPacket();
+  int received = receiveResponse();
+  return received;
+}
+
+int EXPAND::digitalReadPullup(byte pin){
+  io_DataPacket[0] = 3;    // method
+  io_DataPacket[1] = pin;  // pin
+  sendDataPacket();
+  int received = receiveResponse();
+  return received;
+}
+
+void EXPAND::analogWrite(byte pin,byte val){
+  io_DataPacket[0] = 4;    // method
+  io_DataPacket[1] = pin;  // pin
+  io_DataPacket[2] = val;  // val
+  sendDataPacket();
+  int received = receiveResponse();
+}
+
+int EXPAND::analogRead(byte pin){
+  io_DataPacket[0] = 5;    // method
+  io_DataPacket[1] = pin;  // pin
+  sendDataPacket();
+  int received = receiveResponse();
+  return received;
+}
+
+void EXPAND::analogWriteSlow(byte pin,byte val){
+  io_DataPacket[0] = 10;   // method
+  io_DataPacket[1] = pin;  // pin
+  io_DataPacket[2] = val;  // val
+  sendDataPacket();
+  int received = receiveResponse();
+}
+
+
+void EXPAND::sendDataPacket(){
+  Wire.beginTransmission(_addr);
+  Wire.write(io_DataPacket, 3);
+  Wire.endTransmission(true);
+  delay(1);
+}
+
+int EXPAND::receiveResponse(){
+  unsigned int receivedValue;
+  int available = Wire.requestFrom(_addr, (byte)1);
+  byte buffer[2];
+  if(available == 1)
+  {
+     buffer[0] = Wire.read();
+  }
+  available = Wire.requestFrom(_addr, (byte)1);
+  if(available == 1)
+  {
+     buffer[1] = Wire.read();
+  }
+  receivedValue = buffer[0] << 8 | buffer[1];
+  
+  return receivedValue;  
+}
+
+
+
diff --git a/lib/Arduino_I2C_Port_Expander/src/Arduino_I2C_Port_Expander.h b/lib/Arduino_I2C_Port_Expander/src/Arduino_I2C_Port_Expander.h
new file mode 100644
index 0000000..9d9c2b2
--- /dev/null
+++ b/lib/Arduino_I2C_Port_Expander/src/Arduino_I2C_Port_Expander.h
@@ -0,0 +1,31 @@
+#ifndef EXPANDUINO_H
+#define EXPANDUINO_H
+     
+#if ARDUINO >= 100
+  #include "Arduino.h"
+#else
+  #include "WProgram.h"
+#endif
+#include <Wire.h>
+
+class EXPAND {
+  public:
+    EXPAND(uint8_t addr);
+    ~EXPAND();
+    void digitalWrite(byte pin,byte val);
+    int digitalRead(byte pin);
+    int digitalReadPullup(byte pin);
+    void analogWrite(byte pin,byte val);
+    int analogRead(byte pin);
+    void sendDataPacket();
+    int receiveResponse();
+	
+	void analogWriteSlow(byte pin,byte val);
+  private:
+    uint8_t _addr;
+};
+
+
+#endif
+
+