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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_
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