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+/******************************************************************************
+ * 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 Wire.h
+ * @author Trystan Jones <crenn6977@gmail.com>
+ * @brief Wire library, uses the WireBase to create the primary interface
+ * while keeping low level interactions invisible to the user.
+ */
+
+/*
+ * Library updated by crenn to follow new Wire system.
+ * Code was derived from the original Wire for maple code by leaflabs and the
+ * modifications by gke and ala42.
+ */
+
+#ifndef _WIRE_H_
+#define _WIRE_H_
+
+#include <Wire/WireBase.h>
+#include <wirish/wirish.h>
+
+/*
+ * On the Maple, let the default pins be in the same location as the Arduino
+ * pins
+ */
+#define SDA 19
+#define SCL 20
+
+//#define I2C_DELAY(x) {uint32 time=micros(); while(time>(micros()+x));}
+#define I2C_DELAY(x) do{for(int i=0;i<x;i++) {asm volatile("nop");}}while(0)
+#define SOFT_STANDARD 25
+#define SOFT_FAST 7
+
+class TwoWire : public WireBase {
+ private:
+ const uint8 i2c_delay;
+ uint8 scl_pin;
+ uint8 sda_pin;
+
+ /*
+ * Sets the SCL line to HIGH/LOW and allow for clock stretching by slave
+ * devices
+ */
+ void set_scl(bool);
+
+ /*
+ * Sets the SDA line to HIGH/LOW
+ */
+ void set_sda(bool);
+
+ /*
+ * Creates a Start condition on the bus
+ */
+ void i2c_start();
+
+ /*
+ * Creates a Stop condition on the bus
+ */
+ void i2c_stop();
+
+ /*
+ * Gets an ACK condition from a slave device on the bus
+ */
+ bool i2c_get_ack();
+
+ /*
+ * Creates a ACK condition on the bus
+ */
+ void i2c_send_ack();
+
+ /*
+ * Creates a NACK condition on the bus
+ */
+ void i2c_send_nack();
+
+ /*
+ * Shifts in the data through SDA and clocks SCL for the slave device
+ */
+ uint8 i2c_shift_in();
+
+ /*
+ * Shifts out the data through SDA and clocks SCL for the slave device
+ */
+ void i2c_shift_out(uint8);
+ protected:
+ /*
+ * Processes the incoming I2C message defined by WireBase
+ */
+ uint8 process();
+ public:
+ /*
+ * Accept pin numbers for SCL and SDA lines. Set the delay needed
+ * to create the timing for I2C's Standard Mode and Fast Mode.
+ */
+ TwoWire(uint8 scl=SCL, uint8 sda=SDA, uint8 delay=SOFT_STANDARD);
+
+ /*
+ * Sets pins SDA and SCL to OUPTUT_OPEN_DRAIN, joining I2C bus as
+ * master. This function overwrites the default behaviour of
+ * .begin(uint8) in WireBase
+ */
+ void begin(uint8 = 0x00);
+
+ /*
+ * If object is destroyed, set pin numbers to 0.
+ */
+ ~TwoWire();
+};
+
+extern TwoWire Wire;
+
+#endif // _WIRE_H_