/Users/fmalpartida/Documents/development/mercurial repos/SW/NewliquidCrystal/I2CIO.h

// ---------------------------------------------------------------------------
// Created by Francisco Malpartida on 20/08/11.
// Copyright 2011 - Under creative commons license 3.0:
//        Attribution-ShareAlike CC BY-SA
//
// This software is furnished "as is", without technical support, and with no 
// warranty, express or implied, as to its usefulness for any purpose.
//
// Thread Safe: No
// Extendable: Yes
//
// @file I2CIO.h
// This file implements a basic IO library using the PCF8574 I2C IO Expander
// chip.
// 
// @brief 
// Implement a basic IO library to drive the PCF8574* I2C IO Expander ASIC.
// The library implements basic IO general methods to configure IO pin direction
// read and write uint8_t operations and basic pin level routines to set or read
// a particular IO port.
//
// @version API 1.0.0
//
// @author F. Malpartida - fmalpartida@gmail.com
// ---------------------------------------------------------------------------

#ifndef _I2CIO_H_
#define _I2CIO_H_

#include <inttypes.h>

#define _I2CIO_VERSION "1.0.0"

class I2CIO  
{
public:
   I2CIO ( );
   
   int begin ( uint8_t i2cAddr );
   
   void pinMode ( uint8_t pin, uint8_t dir );
   
   void portMode ( uint8_t dir );
   
   uint8_t read ( void );
   
   uint8_t digitalRead ( uint8_t pin );
   
   int write ( uint8_t value );
   
   int digitalWrite ( uint8_t pin, uint8_t level );
   
   
   
private:
   uint8_t _shadow;      // Shadow output
   uint8_t _dirMask;     // Direction mask
   uint8_t _i2cAddr;     // I2C address
   bool    _initialised; // Initialised object

   bool isAvailable (uint8_t i2cAddr);
   
};

#endif