1 files changed, 227 insertions, 0 deletions
diff --git a/libraries/SoftwareSerial/SoftwareSerial.cpp b/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;
+  _bitPeriod = 1000000 / _baudRate;
+
+  digitalWrite(_transmitPin, HIGH);
+  delayMicroseconds( _bitPeriod); // if we were low this establishes the end
+}
+
+int SoftwareSerial::read()
+{
+  int val = 0;
+  int bitDelay = _bitPeriod - clockCyclesToMicroseconds(50);
+  
+  // 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(bitDelay / 2 - clockCyclesToMicroseconds(50));
+	
+    // 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(bitDelay);
+	
+	// read bit
+	val |= digitalRead(_receivePin) << offset;
+    }
+	
+    delayMicroseconds(_bitPeriod);
+    
+    return val;
+  }
+  
+  return -1;
+}
+
+void SoftwareSerial::print(uint8_t b)
+{
+  if (_baudRate == 0)
+    return;
+    
+  int bitDelay = _bitPeriod - clockCyclesToMicroseconds(50); // a digitalWrite is about 50 cycles
+  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(const 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(const 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) {
+    print('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));
+}