Add new hard/soft Wire I2C library.

Added a generic pure abstract class to provide the interface for all
Wire implementations.  Modified the old Wire library using software
interface to use the new Base Wire abstract class.  Added a new
library which allows the use of the Wire class to use the I2C
hardware.  Changed default pin numbers for Software Wire library to
match pin numbers used for I2C/TWI shields created for the Arduino.

Signed-off-by: Trystan Jones <crenn6977@gmail.com>

CREDITS

@@ -77,3 +77,7 @@ W: http://sarup.dk/index.html
 N: Andy Scott ("xttocs")
 E: andy.g.scott@gmail.com
 D: LiquidCrystal library
+
+N: Trystan Jones ("crenn")
+E: crenn6977@gmail.com
+D: New Wire library

libraries/Wire/HardWire.cpp

@@ -0,0 +1,66 @@
+/******************************************************************************
+ * 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.
+ *****************************************************************************/
+
+/**
+ * @file HardWire.cpp
+ * @author Trystan Jones <crenn6977@gmail.com>
+ * @brief Wire library, uses the hardware I2C available in the Maple to
+ *        interact with I2C slave devices.
+ */
+
+/*
+ * Library created by crenn to use the new WireBase system and allow Arduino
+ * users easy interaction with the I2C Hardware in a familiar method.
+ */
+
+#include "HardWire.h"
+
+uint8 HardWire::process() {
+    int8 res = i2c_master_xfer(sel_hard, &itc_msg, 1, 0);
+    if (res != 0) {
+        i2c_disable(sel_hard);
+        i2c_master_enable(sel_hard, (I2C_BUS_RESET | dev_flags));
+    }
+    return 0;
+}
+
+// TODO: Add in Error Handling if devsel is out of range for other Maples
+HardWire::HardWire(uint8 dev_sel, uint8 flags) {
+    if (dev_sel == 1) {
+        sel_hard = I2C1;
+    } else if (dev_sel == 2) {
+        sel_hard = I2C2;
+    } else {
+        ASSERT(1);
+    }
+    dev_flags=flags;
+    i2c_master_enable(sel_hard, flags);
+}
+
+HardWire::~HardWire() {
+    i2c_disable(sel_hard);
+    sel_hard = 0;
+}

libraries/Wire/HardWire.h

@@ -0,0 +1,70 @@
+/******************************************************************************
+ * 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.
+ *****************************************************************************/
+
+/**
+ * @file HardWire.h
+ * @author Trystan Jones <crenn6977@gmail.com>
+ * @brief Wire library, uses the hardware I2C available in the Maple to
+ *        interact with I2C slave devices.
+ */
+
+/*
+ * Library created by crenn to use the new WireBase system and allow Arduino
+ * users easy interaction with the I2C Hardware in a familiar method.
+ */
+
+#include "wirish.h"
+#include "WireBase.h"
+
+#ifndef _HARDWIRE_H_
+#define _HARDWIRE_H_
+
+#include "i2c.h"
+
+class HardWire : public WireBase {
+private:
+    i2c_dev* sel_hard;
+    uint8    dev_flags;
+protected:
+    /*
+     * Processes the incoming I2C message defined by WireBase to the hardware. If
+     * an error occured, restart the I2C device.
+     */
+    uint8 process();
+public:
+    /*
+     * Check if devsel is within range and enable selected I2C interface with
+     * passed flags
+     */
+    HardWire(uint8, uint8 = 0);
+
+    /*
+     * Disables the I2C device and remove the device address.
+     */
+    ~HardWire();
+};
+
+#endif // _HARDWIRE_H_