Adding software serial libraries. The read function doesn't quite work properly yet, but it's a start.

targets/libraries/SoftwareSerial/SoftwareSerial.cpp

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+/*
+  SoftwareSerial.cpp - Software serial library
+  Copyright (c) 2006 David A. Mellis.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+/******************************************************************************
+ * Includes
+ ******************************************************************************/
+
+#include "WConstants.h"
+#include "SoftwareSerial.h"
+
+/******************************************************************************
+ * Definitions
+ ******************************************************************************/
+
+/******************************************************************************
+ * Constructors
+ ******************************************************************************/
+
+SoftwareSerial::SoftwareSerial(uint8_t receivePin, uint8_t transmitPin)
+{
+  _receivePin = receivePin;
+  _transmitPin = transmitPin;
+  _baudRate = 0;
+}
+
+/******************************************************************************
+ * User API
+ ******************************************************************************/
+
+void SoftwareSerial::begin(long speed)
+{
+  _baudRate = speed;
+}
+
+int SoftwareSerial::read()
+{
+  int val = 0;
+  int width = 1000000 / _baudRate;
+  int fudge = -8;  
+  //int fudge = -16;
+  
+  // one byte of serial data (LSB first)
+  // ...--\    /--\/--\/--\/--\/--\/--\/--\/--\/--...
+  //	 \--/\--/\--/\--/\--/\--/\--/\--/\--/
+  //	start  0   1   2   3   4   5   6   7 stop
+
+  while (digitalRead(_receivePin));
+
+  // confirm that this is a real start bit, not line noise
+  if (digitalRead(_receivePin) == LOW) {
+    // frame start indicated by a falling edge and low start bit
+    // jump to the middle of the low start bit
+    delayMicroseconds(width / 2);
+	
+    // offset of the bit in the byte: from 0 (LSB) to 7 (MSB)
+    for (int offset = 0; offset < 8; offset++) {
+	// jump to middle of next bit
+	delayMicroseconds(width + fudge);
+	
+	// read bit
+	val |= digitalRead(_receivePin) << offset;
+    }
+	
+    delayMicroseconds(width + fudge);
+    
+    return val;
+  }
+  
+  return -1;
+}
+
+void SoftwareSerial::print(uint8_t b)
+{
+  if (_baudRate == 0)
+    return;
+    
+  int bitDelay = 1000000 / _baudRate - 15;
+  byte mask;
+
+  digitalWrite(_transmitPin, LOW);
+  delayMicroseconds(bitDelay);
+
+  for (mask = 0x01; mask; mask <<= 1) {
+    if (b & mask){ // choose bit
+      digitalWrite(_transmitPin,HIGH); // send 1
+    }
+    else{
+      digitalWrite(_transmitPin,LOW); // send 1
+    }
+    delayMicroseconds(bitDelay);
+  }
+
+  digitalWrite(_transmitPin, HIGH);
+  delayMicroseconds(bitDelay);
+}
+
+void SoftwareSerial::print(char *s)
+{
+  while (*s)
+    print(*s++);
+}
+
+void SoftwareSerial::print(char c)
+{
+  print((uint8_t) c);
+}
+
+void SoftwareSerial::print(int n)
+{
+  print((long) n);
+}
+
+void SoftwareSerial::print(unsigned int n)
+{
+  print((unsigned long) n);
+}
+
+void SoftwareSerial::print(long n)
+{
+  if (n < 0) {
+    print('-');
+    n = -n;
+  }
+  printNumber(n, 10);
+}
+
+void SoftwareSerial::print(unsigned long n)
+{
+  printNumber(n, 10);
+}
+
+void SoftwareSerial::print(long n, int base)
+{
+  if (base == 0)
+    print((char) n);
+  else if (base == 10)
+    print(n);
+  else
+    printNumber(n, base);
+}
+
+void SoftwareSerial::println(void)
+{
+  print('\r');
+  print('\n');  
+}
+
+void SoftwareSerial::println(char c)
+{
+  print(c);
+  println();  
+}
+
+void SoftwareSerial::println(char c[])
+{
+  print(c);
+  println();
+}
+
+void SoftwareSerial::println(uint8_t b)
+{
+  print(b);
+  println();
+}
+
+void SoftwareSerial::println(int n)
+{
+  print(n);
+  println();
+}
+
+void SoftwareSerial::println(long n)
+{
+  print(n);
+  println();  
+}
+
+void SoftwareSerial::println(unsigned long n)
+{
+  print(n);
+  println();  
+}
+
+void SoftwareSerial::println(long n, int base)
+{
+  print(n, base);
+  println();
+}
+
+// Private Methods /////////////////////////////////////////////////////////////
+
+void SoftwareSerial::printNumber(unsigned long n, uint8_t base)
+{
+  unsigned char buf[8 * sizeof(long)]; // Assumes 8-bit chars. 
+  unsigned long i = 0;
+
+  if (n == 0) {
+    printByte('0');
+    return;
+  } 
+
+  while (n > 0) {
+    buf[i++] = n % base;
+    n /= base;
+  }
+
+  for (; i > 0; i--)
+    print((char) (buf[i - 1] < 10 ? '0' + buf[i - 1] : 'A' + buf[i - 1] - 10));
+}

targets/libraries/SoftwareSerial/SoftwareSerial.h

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+/*
+  SoftwareSerial.h - Software serial library
+  Copyright (c) 2006 David A. Mellis.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef SoftwareSerial_h
+#define SoftwareSerial_h
+
+#include <inttypes.h>
+
+class SoftwareSerial
+{
+  private:
+    uint8_t _receivePin;
+    uint8_t _transmitPin;
+    long _baudRate;
+    void printNumber(unsigned long, uint8_t);
+  public:
+    SoftwareSerial(uint8_t, uint8_t);
+    void begin(long);
+    int read();
+    void print(char);
+    void print(char[]);
+    void print(uint8_t);
+    void print(int);
+    void print(unsigned int);
+    void print(long);
+    void print(unsigned long);
+    void print(long, int);
+    void println(void);
+    void println(char);
+    void println(char[]);
+    void println(uint8_t);
+    void println(int);
+    void println(long);
+    void println(unsigned long);
+    void println(long, int);
+};
+
+#endif
+

targets/libraries/SoftwareSerial/keywords.txt

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+#######################################
+# Syntax Coloring Map For Ultrasound
+#######################################
+
+#######################################
+# Datatypes (KEYWORD1)
+#######################################
+
+SoftwareSerial	KEYWORD1
+
+#######################################
+# Methods and Functions (KEYWORD2)
+#######################################
+
+#######################################
+# Constants (LITERAL1)
+#######################################
+