Merge remote branch 'leaf/master'

9 files changed, 853 insertions, 3 deletions

diff --git a/libraries/LiquidCrystal/LiquidCrystal.cpp b/libraries/LiquidCrystal/LiquidCrystal.cpp
new file mode 100644
index 0000000..52f0308
--- /dev/null
+++ b/libraries/LiquidCrystal/LiquidCrystal.cpp
@@ -0,0 +1,324 @@
+#include "LiquidCrystal.h"
+
+#include <stdio.h>
+#include <string.h>
+#include "WProgram.h"
+
+// When the display powers up, it is configured as follows:
+//
+// 1. Display clear
+// 2. Function set:
+//    DL = 1; 8-bit interface data
+//    N = 0; 1-line display
+//    F = 0; 5x8 dot character font
+// 3. Display on/off control:
+//    D = 0; Display off
+//    C = 0; Cursor off
+//    B = 0; Blinking off
+// 4. Entry mode set:
+//    I/D = 1; Increment by 1
+//    S = 0; No shift
+//
+// Note, however, that resetting the Arduino doesn't reset the LCD, so we
+// can't assume that its in that state when a sketch starts (and the
+// LiquidCrystal constructor is called).
+
+// This library has been modified to be compatible with the LeafLabs Maple;
+// very conservative timing is used due to problems with delayMicroseconds()
+// that should be fixed in the 0.0.7 release of the libmaple. [bnewbold]
+
+LiquidCrystal::LiquidCrystal(uint8 rs, uint8 rw, uint8 enable,
+                             uint8 d0, uint8 d1, uint8 d2, uint8 d3,
+                             uint8 d4, uint8 d5, uint8 d6, uint8 d7)
+{
+  init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7);
+}
+
+LiquidCrystal::LiquidCrystal(uint8 rs, uint8 enable,
+                             uint8 d0, uint8 d1, uint8 d2, uint8 d3,
+                             uint8 d4, uint8 d5, uint8 d6, uint8 d7)
+{
+  init(0, rs, 255, enable, d0, d1, d2, d3, d4, d5, d6, d7);
+}
+
+LiquidCrystal::LiquidCrystal(uint8 rs, uint8 rw, uint8 enable,
+                             uint8 d0, uint8 d1, uint8 d2, uint8 d3)
+{
+  init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0);
+}
+
+LiquidCrystal::LiquidCrystal(uint8 rs,  uint8 enable,
+                             uint8 d0, uint8 d1, uint8 d2, uint8 d3)
+{
+  init(1, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0);
+}
+
+void LiquidCrystal::init(uint8 fourbitmode, uint8 rs, uint8 rw, uint8 enable,
+                         uint8 d0, uint8 d1, uint8 d2, uint8 d3,
+                         uint8 d4, uint8 d5, uint8 d6, uint8 d7)
+{
+  _rs_pin = rs;
+  _rw_pin = rw;
+  _enable_pin = enable;
+
+  _data_pins[0] = d0;
+  _data_pins[1] = d1;
+  _data_pins[2] = d2;
+  _data_pins[3] = d3;
+  _data_pins[4] = d4;
+  _data_pins[5] = d5;
+  _data_pins[6] = d6;
+  _data_pins[7] = d7;
+
+  pinMode(_rs_pin, OUTPUT);
+  // we can save 1 pin by not using RW. Indicate by passing 255 instead of pin#
+  if (_rw_pin != 255) {
+    pinMode(_rw_pin, OUTPUT);
+  }
+  pinMode(_enable_pin, OUTPUT);
+
+  if (fourbitmode)
+    _displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
+  else
+    _displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS;
+
+  // TODO: bnewbold, re-enable this?
+  begin(16, 1);
+}
+
+void LiquidCrystal::begin(uint8 cols, uint8 lines, uint8 dotsize) {
+  if (lines > 1) {
+    _displayfunction |= LCD_2LINE;
+  }
+  _numlines = lines;
+  _currline = 0;
+
+  // for some 1 line displays you can select a 10 pixel high font
+  if ((dotsize != 0) && (lines == 1)) {
+    _displayfunction |= LCD_5x10DOTS;
+  }
+
+  // SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
+  // according to datasheet, we need at least 40ms after power rises above 2.7V
+  // before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
+  delay(50);    // Maple mod
+  //delayMicroseconds(50000);
+  // Now we pull both RS and R/W low to begin commands
+  digitalWrite(_rs_pin, LOW);
+  digitalWrite(_enable_pin, LOW);
+  if (_rw_pin != 255) {
+    digitalWrite(_rw_pin, LOW);
+  }
+
+  //put the LCD into 4 bit or 8 bit mode
+  if (! (_displayfunction & LCD_8BITMODE)) {
+    // this is according to the hitachi HD44780 datasheet
+    // figure 24, pg 46
+
+    // we start in 8bit mode, try to set 4 bit mode
+    write4bits(0x03);
+    delay(5);   // Maple mod
+    //delayMicroseconds(4500); // wait min 4.1ms
+
+    // second try
+    write4bits(0x03);
+    delay(5);   // Maple mod
+    //delayMicroseconds(4500); // wait min 4.1ms
+
+    // third go!
+    write4bits(0x03);
+    delay(1);   // Maple mod
+    //delayMicroseconds(150);
+
+    // finally, set to 8-bit interface
+    write4bits(0x02);
+  } else {
+    // this is according to the hitachi HD44780 datasheet
+    // page 45 figure 23
+
+    // Send function set command sequence
+    command(LCD_FUNCTIONSET | _displayfunction);
+    delay(5);   // Maple mod
+    //delayMicroseconds(4500);  // wait more than 4.1ms
+
+    // second try
+    command(LCD_FUNCTIONSET | _displayfunction);
+    delay(1);   // Maple mod
+    //delayMicroseconds(150);
+
+    // third go
+    command(LCD_FUNCTIONSET | _displayfunction);
+  }
+
+  // finally, set # lines, font size, etc.
+  command(LCD_FUNCTIONSET | _displayfunction);
+
+  // turn the display on with no cursor or blinking default
+  _displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
+  display();
+
+  // clear it off
+  clear();
+
+  // Initialize to default text direction (for romance languages)
+  _displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
+  // set the entry mode
+  command(LCD_ENTRYMODESET | _displaymode);
+
+}
+
+/********** high level commands, for the user! */
+void LiquidCrystal::clear()
+{
+  command(LCD_CLEARDISPLAY);  // clear display, set cursor position to zero
+  delay(2);     // Maple mod
+  //delayMicroseconds(2000);  // this command takes a long time!
+}
+
+void LiquidCrystal::home()
+{
+  command(LCD_RETURNHOME);  // set cursor position to zero
+  delay(2);     // Maple mod
+  //delayMicroseconds(2000);  // this command takes a long time!
+}
+
+void LiquidCrystal::setCursor(uint8 col, uint8 row)
+{
+  int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
+  if ( row > _numlines ) {
+    row = _numlines-1;    // we count rows starting w/0
+  }
+
+  command(LCD_SETDDRAMADDR | (col + row_offsets[row]));
+}
+
+// Turn the display on/off (quickly)
+void LiquidCrystal::noDisplay() {
+  _displaycontrol &= ~LCD_DISPLAYON;
+  command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+void LiquidCrystal::display() {
+  _displaycontrol |= LCD_DISPLAYON;
+  command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+
+// Turns the underline cursor on/off
+void LiquidCrystal::noCursor() {
+  _displaycontrol &= ~LCD_CURSORON;
+  command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+void LiquidCrystal::cursor() {
+  _displaycontrol |= LCD_CURSORON;
+  command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+
+// Turn on and off the blinking cursor
+void LiquidCrystal::noBlink() {
+  _displaycontrol &= ~LCD_BLINKON;
+  command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+void LiquidCrystal::blink() {
+  _displaycontrol |= LCD_BLINKON;
+  command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+
+// These commands scroll the display without changing the RAM
+void LiquidCrystal::scrollDisplayLeft(void) {
+  command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
+}
+void LiquidCrystal::scrollDisplayRight(void) {
+  command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
+}
+
+// This is for text that flows Left to Right
+void LiquidCrystal::leftToRight(void) {
+  _displaymode |= LCD_ENTRYLEFT;
+  command(LCD_ENTRYMODESET | _displaymode);
+}
+
+// This is for text that flows Right to Left
+void LiquidCrystal::rightToLeft(void) {
+  _displaymode &= ~LCD_ENTRYLEFT;
+  command(LCD_ENTRYMODESET | _displaymode);
+}
+
+// This will 'right justify' text from the cursor
+void LiquidCrystal::autoscroll(void) {
+  _displaymode |= LCD_ENTRYSHIFTINCREMENT;
+  command(LCD_ENTRYMODESET | _displaymode);
+}
+
+// This will 'left justify' text from the cursor
+void LiquidCrystal::noAutoscroll(void) {
+  _displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
+  command(LCD_ENTRYMODESET | _displaymode);
+}
+
+// Allows us to fill the first 8 CGRAM locations
+// with custom characters
+void LiquidCrystal::createChar(uint8 location, uint8 charmap[]) {
+  location &= 0x7; // we only have 8 locations 0-7
+  command(LCD_SETCGRAMADDR | (location << 3));
+  for (int i=0; i<8; i++) {
+    write(charmap[i]);
+  }
+}
+
+/*********** mid level commands, for sending data/cmds */
+
+inline void LiquidCrystal::command(uint8 value) {
+  send(value, LOW);
+}
+
+inline void LiquidCrystal::write(uint8 value) {
+  send(value, HIGH);
+}
+
+/************ low level data pushing commands **********/
+
+// write either command or data, with automatic 4/8-bit selection
+void LiquidCrystal::send(uint8 value, uint8 mode) {
+  digitalWrite(_rs_pin, mode);
+
+  // if there is a RW pin indicated, set it low to Write
+  if (_rw_pin != 255) {
+    digitalWrite(_rw_pin, LOW);
+  }
+
+  if (_displayfunction & LCD_8BITMODE) {
+    write8bits(value);
+  } else {
+    write4bits(value>>4);
+    write4bits(value);
+  }
+}
+
+void LiquidCrystal::pulseEnable(void) {
+  digitalWrite(_enable_pin, LOW);
+  delay(1);     // Maple mod
+  //delayMicroseconds(1);
+  digitalWrite(_enable_pin, HIGH);
+  delay(1);     // Maple mod
+  //delayMicroseconds(1);    // enable pulse must be >450ns
+  digitalWrite(_enable_pin, LOW);
+  delay(1);     // Maple mod
+  //delayMicroseconds(100);   // commands need > 37us to settle
+}
+
+void LiquidCrystal::write4bits(uint8 value) {
+  for (int i = 0; i < 4; i++) {
+    pinMode(_data_pins[i], OUTPUT);
+    digitalWrite(_data_pins[i], (value >> i) & 0x01);
+  }
+
+  pulseEnable();
+}
+
+void LiquidCrystal::write8bits(uint8 value) {
+  for (int i = 0; i < 8; i++) {
+    pinMode(_data_pins[i], OUTPUT);
+    digitalWrite(_data_pins[i], (value >> i) & 0x01);
+  }
+
+  pulseEnable();
+}
diff --git a/libraries/LiquidCrystal/LiquidCrystal.h b/libraries/LiquidCrystal/LiquidCrystal.h
new file mode 100644
index 0000000..0baf543
--- /dev/null
+++ b/libraries/LiquidCrystal/LiquidCrystal.h
@@ -0,0 +1,105 @@
+#ifndef LiquidCrystal_h
+#define LiquidCrystal_h
+
+//#include <inttypes.h>
+#include "wirish.h"
+#include "Print.h"
+
+// commands
+#define LCD_CLEARDISPLAY 0x01
+#define LCD_RETURNHOME 0x02
+#define LCD_ENTRYMODESET 0x04
+#define LCD_DISPLAYCONTROL 0x08
+#define LCD_CURSORSHIFT 0x10
+#define LCD_FUNCTIONSET 0x20
+#define LCD_SETCGRAMADDR 0x40
+#define LCD_SETDDRAMADDR 0x80
+
+// flags for display entry mode
+#define LCD_ENTRYRIGHT 0x00
+#define LCD_ENTRYLEFT 0x02
+#define LCD_ENTRYSHIFTINCREMENT 0x01
+#define LCD_ENTRYSHIFTDECREMENT 0x00
+
+// flags for display on/off control
+#define LCD_DISPLAYON 0x04
+#define LCD_DISPLAYOFF 0x00
+#define LCD_CURSORON 0x02
+#define LCD_CURSOROFF 0x00
+#define LCD_BLINKON 0x01
+#define LCD_BLINKOFF 0x00
+
+// flags for display/cursor shift
+#define LCD_DISPLAYMOVE 0x08
+#define LCD_CURSORMOVE 0x00
+#define LCD_MOVERIGHT 0x04
+#define LCD_MOVELEFT 0x00
+
+// flags for function set
+#define LCD_8BITMODE 0x10
+#define LCD_4BITMODE 0x00
+#define LCD_2LINE 0x08
+#define LCD_1LINE 0x00
+#define LCD_5x10DOTS 0x04
+#define LCD_5x8DOTS 0x00
+
+class LiquidCrystal : public Print {
+public:
+  LiquidCrystal(uint8 rs, uint8 enable,
+                uint8 d0, uint8 d1, uint8 d2, uint8 d3,
+                uint8 d4, uint8 d5, uint8 d6, uint8 d7);
+  LiquidCrystal(uint8 rs, uint8 rw, uint8 enable,
+                uint8 d0, uint8 d1, uint8 d2, uint8 d3,
+                uint8 d4, uint8 d5, uint8 d6, uint8 d7);
+  LiquidCrystal(uint8 rs, uint8 rw, uint8 enable,
+                uint8 d0, uint8 d1, uint8 d2, uint8 d3);
+  LiquidCrystal(uint8 rs, uint8 enable,
+                uint8 d0, uint8 d1, uint8 d2, uint8 d3);
+
+  void init(uint8 fourbitmode, uint8 rs, uint8 rw, uint8 enable,
+            uint8 d0, uint8 d1, uint8 d2, uint8 d3,
+            uint8 d4, uint8 d5, uint8 d6, uint8 d7);
+
+  void begin(uint8 cols, uint8 rows, uint8 charsize = LCD_5x8DOTS);
+
+  void clear();
+  void home();
+
+  void noDisplay();
+  void display();
+  void noBlink();
+  void blink();
+  void noCursor();
+  void cursor();
+  void scrollDisplayLeft();
+  void scrollDisplayRight();
+  void leftToRight();
+  void rightToLeft();
+  void autoscroll();
+  void noAutoscroll();
+
+  void createChar(uint8, uint8[]);
+  void setCursor(uint8, uint8);
+  virtual void write(uint8);
+  void command(uint8);
+private:
+  void send(uint8, uint8);
+  void write4bits(uint8);
+  void write8bits(uint8);
+  void pulseEnable();
+
+  uint8 _rs_pin; // LOW: command.  HIGH: character.
+  uint8 _rw_pin; // LOW: write to LCD.  HIGH: read from LCD.
+  uint8 _enable_pin; // activated by a HIGH pulse.
+  uint8 _data_pins[8];
+
+  uint8 _displayfunction;
+  uint8 _displaycontrol;
+  uint8 _displaymode;
+
+  uint8 _initialized;
+
+  uint8 _numlines,_currline;
+};
+
+#endif
diff --git a/libraries/LiquidCrystal/rules.mk b/libraries/LiquidCrystal/rules.mk
new file mode 100644
index 0000000..7b18203
--- /dev/null
+++ b/libraries/LiquidCrystal/rules.mk
@@ -0,0 +1,29 @@
+# Standard things
+sp := $(sp).x
+dirstack_$(sp) := $(d)
+d := $(dir)
+BUILDDIRS += $(BUILD_PATH)/$(d)
+
+# Local flags
+CFLAGS_$(d) := $(WIRISH_INCLUDES) $(LIBMAPLE_INCLUDES)
+
+# Local rules and targets
+cSRCS_$(d) :=
+
+cppSRCS_$(d) := LiquidCrystal.cpp
+
+cFILES_$(d) := $(cSRCS_$(d):%=$(d)/%)
+cppFILES_$(d) := $(cppSRCS_$(d):%=$(d)/%)
+
+OBJS_$(d) := $(cFILES_$(d):%.c=$(BUILD_PATH)/%.o) \
+                 $(cppFILES_$(d):%.cpp=$(BUILD_PATH)/%.o)
+DEPS_$(d) := $(OBJS_$(d):%.o=%.d)
+
+$(OBJS_$(d)): TGT_CFLAGS := $(CFLAGS_$(d))
+
+TGT_BIN += $(OBJS_$(d))
+
+# Standard things
+-include $(DEPS_$(d))
+d := $(dirstack_$(sp))
+sp := $(basename $(sp))
\ No newline at end of file
diff --git a/libraries/Servo/Servo.cpp b/libraries/Servo/Servo.cpp
index 4f60fbe..ae87b63 100644
--- a/libraries/Servo/Servo.cpp
+++ b/libraries/Servo/Servo.cpp
@@ -22,13 +22,13 @@
  * THE SOFTWARE.
  *****************************************************************************/
 
+#include "Servo.h"
+
 #include "boards.h"
 #include "io.h"
 #include "pwm.h"
 #include "wirish_math.h"
 
-#include "Servo.h"
-
 // Configure prescaler and overflow for a 20msec period (could just
 // use HardwareTimer::setPeriod(), but this lets conversions below
 // happen more statically, in combination with an inlined map() -- a
diff --git a/libraries/Servo/Servo.h b/libraries/Servo/Servo.h
index d35572a..1c75618 100644
--- a/libraries/Servo/Servo.h
+++ b/libraries/Servo/Servo.h
@@ -27,7 +27,7 @@
 
 #include <stdint.h>
 
-#include "HardwareTimer.h"
+#include "wirish.h"             /* hack for IDE compile */
 
 /* Note on Arduino compatibility:
 
diff --git a/libraries/Wire/README b/libraries/Wire/README
new file mode 100644
index 0000000..353d51a
--- /dev/null
+++ b/libraries/Wire/README
@@ -0,0 +1,5 @@
+Wirish soft (bit-banged) implementation of the Wire I2C library.
+
+This implementation is synchronous, and thus supports only a subset of
+the full Wire interface.  An asynchronous hardware version implemented
+with DMA is expected for Maple IDE release 0.1.0.
diff --git a/libraries/Wire/Wire.cpp b/libraries/Wire/Wire.cpp
new file mode 100644
index 0000000..736bd25
--- /dev/null
+++ b/libraries/Wire/Wire.cpp
@@ -0,0 +1,259 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 LeafLabs LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *****************************************************************************/
+
+/**
+ *  @brief Wire library, ported from Arduino. Provides a simplistic
+ *  interface to i2c.
+ */
+
+#include "Wire.h"
+#include "wirish.h"
+
+/* low level conventions:
+ * - SDA/SCL idle high (expected high)
+ * - always start with i2c_delay rather than end
+ */
+uint32 i2c_delay = 1;
+
+void i2c_start(Port port) {
+    I2C_DELAY;
+    digitalWrite(port.sda,LOW);
+    I2C_DELAY;
+    digitalWrite(port.scl,LOW);
+}
+
+void i2c_stop(Port port) {
+    I2C_DELAY;
+    digitalWrite(port.scl,HIGH);
+    I2C_DELAY;
+    digitalWrite(port.sda,HIGH);
+}
+
+boolean i2c_get_ack(Port port) {
+    I2C_DELAY;
+    digitalWrite(port.scl,LOW);
+    I2C_DELAY;
+    digitalWrite(port.sda,HIGH);
+    I2C_DELAY;
+    digitalWrite(port.scl,HIGH);
+    I2C_DELAY;
+
+    if (!digitalRead(port.sda)) {
+      I2C_DELAY;
+      digitalWrite(port.scl,LOW);
+      return true;
+    } else {
+      I2C_DELAY;
+      digitalWrite(port.scl,LOW);
+      return false;
+    }
+}
+
+void i2c_send_ack(Port port) {
+    I2C_DELAY;
+    digitalWrite(port.sda,LOW);
+    I2C_DELAY;
+    digitalWrite(port.scl,HIGH);
+    I2C_DELAY;
+    digitalWrite(port.scl,LOW);
+}
+
+void i2c_send_nack(Port port) {
+    I2C_DELAY;
+    digitalWrite(port.sda,HIGH);
+    I2C_DELAY;
+    digitalWrite(port.scl,HIGH);
+}
+
+uint8 i2c_shift_in(Port port) {
+    uint8 data = 0;
+
+    int i;
+    for (i=0;i<8;i++) {
+        I2C_DELAY;
+        digitalWrite(port.scl,HIGH);
+        I2C_DELAY;
+        data += digitalRead(port.sda) << (7-i);
+        I2C_DELAY;
+        digitalWrite(port.scl,LOW);
+    }
+
+    return data;
+}
+
+void i2c_shift_out(Port port, uint8 val) {
+    int i;
+    for (i=0;i<8;i++) {
+        I2C_DELAY;
+        digitalWrite(port.sda, !!(val & (1 << (7 - i))));
+        I2C_DELAY;
+        digitalWrite(port.scl, HIGH);
+        I2C_DELAY;
+        digitalWrite(port.scl, LOW);
+    }
+}
+
+TwoWire::TwoWire() {
+    i2c_delay = 0;
+    rx_buf_idx = 0;
+    rx_buf_len = 0;
+    tx_addr = 0;
+    tx_buf_idx = 0;
+    tx_buf_overflow = false;
+}
+
+/*
+ * Sets pins SDA and SCL to OUPTUT_OPEN_DRAIN, joining I2C bus as
+ * master.  If you want them to be some other pins, use begin(uint8,
+ * uint8);
+ */
+void TwoWire::begin() {
+    begin(SDA, SCL);
+}
+
+/*
+ * Joins I2C bus as master on given SDA and SCL pins.
+ */
+void TwoWire::begin(uint8 sda, uint8 scl) {
+    port.sda = sda;
+    port.scl = scl;
+    pinMode(scl, OUTPUT_OPEN_DRAIN);
+    pinMode(sda, OUTPUT_OPEN_DRAIN);
+    digitalWrite(scl, HIGH);
+    digitalWrite(sda, HIGH);
+}
+
+void TwoWire::beginTransmission(uint8 slave_address) {
+    tx_addr = slave_address;
+    tx_buf_idx = 0;
+    tx_buf_overflow = false;
+    rx_buf_idx = 0;
+    rx_buf_len = 0;
+}
+
+void TwoWire::beginTransmission(int slave_address) {
+    beginTransmission((uint8)slave_address);
+}
+
+uint8 TwoWire::endTransmission(void) {
+    if (tx_buf_overflow) return EDATA;
+
+    i2c_start(port);
+
+    i2c_shift_out(port, (tx_addr << 1) | I2C_WRITE);
+    if (!i2c_get_ack(port)) return ENACKADDR;
+
+    // shift out the address we're transmitting to
+    for (uint8 i = 0; i < tx_buf_idx; i++) {
+        uint8 ret = writeOneByte(tx_buf[i]);
+        if (ret) return ret;    // SUCCESS is 0
+    }
+
+    i2c_stop(port);
+
+    tx_buf_idx = 0;
+    tx_buf_overflow = false;
+    return SUCCESS;
+}
+
+uint8 TwoWire::requestFrom(uint8 address, int num_bytes) {
+    if (num_bytes > WIRE_BUFSIZ) num_bytes = WIRE_BUFSIZ;
+
+    rx_buf_idx = 0;
+    rx_buf_len = 0;
+    while (rx_buf_len < num_bytes) {
+        if(!readOneByte(address, rx_buf + rx_buf_len)) rx_buf_len++;
+        else break;
+    }
+    return rx_buf_len;
+}
+
+uint8 TwoWire::requestFrom(int address, int numBytes) {
+    return TwoWire::requestFrom((uint8)address, (uint8) numBytes);
+}
+
+void TwoWire::send(uint8 value) {
+    if (tx_buf_idx == WIRE_BUFSIZ) {
+        tx_buf_overflow = true;
+        return;
+    }
+
+    tx_buf[tx_buf_idx++] = value;
+}
+
+void TwoWire::send(uint8* buf, int len) {
+    for (uint8 i = 0; i < len; i++) send(buf[i]);
+}
+
+void TwoWire::send(int value) {
+    send((uint8)value);
+}
+
+void TwoWire::send(int* buf, int len) {
+    send((uint8*)buf, (uint8)len);
+}
+
+void TwoWire::send(char* buf) {
+    uint8 *ptr = (uint8*)buf;
+    while(*ptr) {
+        send(*ptr);
+        ptr++;
+    }
+}
+
+uint8 TwoWire::available() {
+    return rx_buf_len - rx_buf_idx;
+}
+
+uint8 TwoWire::receive() {
+    if (rx_buf_idx == rx_buf_len) return 0;
+    return rx_buf[rx_buf_idx++];
+}
+
+// private methods
+
+uint8 TwoWire::writeOneByte(uint8 byte) {
+    i2c_shift_out(port, byte);
+    if (!i2c_get_ack(port)) return ENACKTRNS;
+
+    return SUCCESS;
+}
+
+uint8 TwoWire::readOneByte(uint8 address, uint8 *byte) {
+    i2c_start(port);
+
+    i2c_shift_out(port, (address << 1) | I2C_READ);
+    if (!i2c_get_ack(port)) return ENACKADDR;
+
+    *byte = i2c_shift_in(port);
+
+    i2c_send_nack(port);
+    i2c_stop(port);
+
+    return SUCCESS;      // no real way of knowing, but be optimistic!
+}
+
+// Declare the instance that the users of the library can use
+TwoWire Wire;
+
diff --git a/libraries/Wire/Wire.h b/libraries/Wire/Wire.h
new file mode 100644
index 0000000..62e37bd
--- /dev/null
+++ b/libraries/Wire/Wire.h
@@ -0,0 +1,99 @@
+/* *****************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 LeafLabs LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ * ****************************************************************************/
+
+/**
+ *  @brief Wire library, ported from Arduino. Provides a lean
+ *  interface to I2C (two-wire) communication.
+ */
+
+#include "wirish.h"
+
+#ifndef _WIRE_H_
+#define _WIRE_H_
+
+typedef struct {
+  uint8 scl;
+  uint8 sda;
+} Port;
+
+/* You must update the online docs if you change this value. */
+#define WIRE_BUFSIZ 32
+
+/* return codes from endTransmission() */
+#define SUCCESS   0        /* transmission was successful */
+#define EDATA     1        /* too much data */
+#define ENACKADDR 2        /* received nack on transmit of address */
+#define ENACKTRNS 3        /* received nack on transmit of data */
+#define EOTHER    4        /* other error */
+
+#define SDA 20
+#define SCL 21
+
+#define I2C_WRITE 0
+#define I2C_READ  1
+
+#define I2C_DELAY do{for(int i=0;i<50;i++) {asm volatile("nop");}}while(0)
+
+class TwoWire {
+ private:
+    uint8 rx_buf[WIRE_BUFSIZ];      /* receive buffer */
+    uint8 rx_buf_idx;               /* first unread idx in rx_buf */
+    uint8 rx_buf_len;               /* number of bytes read */
+
+    uint8 tx_addr;                  /* address transmitting to */
+    uint8 tx_buf[WIRE_BUFSIZ];      /* transmit buffer */
+    uint8 tx_buf_idx;  /* next idx available in tx_buf, -1 overflow */
+    boolean tx_buf_overflow;
+    Port port;
+    uint8 writeOneByte(uint8);
+    uint8 readOneByte(uint8, uint8*);
+ public:
+    TwoWire();
+    void begin();
+    void begin(uint8, uint8);
+    void beginTransmission(uint8);
+    void beginTransmission(int);
+    uint8 endTransmission(void);
+    uint8 requestFrom(uint8, int);
+    uint8 requestFrom(int, int);
+    void send(uint8);
+    void send(uint8*, int);
+    void send(int);
+    void send(int*, int);
+    void send(char*);
+    uint8 available();
+    uint8 receive();
+};
+
+void    i2c_start(Port port);
+void    i2c_stop(Port port);
+boolean i2c_get_ack(Port port);
+void    i2c_send_ack(Port port);
+void    i2c_send_nack(Port port);
+uint8   i2c_shift_in(Port port);
+void    i2c_shift_out(Port port, uint8 val);
+
+extern TwoWire Wire;
+
+#endif // _WIRE_H_
diff --git a/libraries/Wire/rules.mk b/libraries/Wire/rules.mk
new file mode 100644
index 0000000..71f5e75
--- /dev/null
+++ b/libraries/Wire/rules.mk
@@ -0,0 +1,29 @@
+# Standard things
+sp := $(sp).x
+dirstack_$(sp) := $(d)
+d := $(dir)
+BUILDDIRS += $(BUILD_PATH)/$(d)
+
+# Local flags
+CFLAGS_$(d) := $(WIRISH_INCLUDES) $(LIBMAPLE_INCLUDES)
+
+# Local rules and targets
+cSRCS_$(d) :=
+
+cppSRCS_$(d) := Wire.cpp
+
+cFILES_$(d) := $(cSRCS_$(d):%=$(d)/%)
+cppFILES_$(d) := $(cppSRCS_$(d):%=$(d)/%)
+
+OBJS_$(d) := $(cFILES_$(d):%.c=$(BUILD_PATH)/%.o) \
+                 $(cppFILES_$(d):%.cpp=$(BUILD_PATH)/%.o)
+DEPS_$(d) := $(OBJS_$(d):%.o=%.d)
+
+$(OBJS_$(d)): TGT_CFLAGS := $(CFLAGS_$(d))
+
+TGT_BIN += $(OBJS_$(d))
+
+# Standard things
+-include $(DEPS_$(d))
+d := $(dirstack_$(sp))
+sp := $(basename $(sp))
\ No newline at end of file