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/*!
\file
\brief pin definitions and I/O macros

why double up on these macros? see http://gcc.gnu.org/onlinedocs/cpp/Stringification.html
*/

#ifndef _ARDUINO_H
#define _ARDUINO_H

#include <avr/io.h>

/*
utility functions
*/

#ifndef MASK
/// MASKING- returns \f$2^PIN\f$
#define MASK(PIN) (1 << PIN)
#endif

/*
magic I/O routines

now you can simply SET_OUTPUT(STEP); WRITE(STEP, 1); WRITE(STEP, 0);
*/

/// Read a pin
#define _READ(IO) (IO ## _RPORT & MASK(IO ## _PIN))
/// write to a pin
#define _WRITE(IO, v) do { if (v) { IO ## _WPORT |= MASK(IO ## _PIN); } else { IO ## _WPORT &= ~MASK(IO ## _PIN); }; } while (0)
/// toggle a pin
#define _TOGGLE(IO) do { IO ## _RPORT = MASK(IO ## _PIN); } while (0)

/// set pin as input
#define _SET_INPUT(IO) do { IO ## _DDR &= ~MASK(IO ## _PIN); } while (0)
/// set pin as output
#define _SET_OUTPUT(IO) do { IO ## _DDR |= MASK(IO ## _PIN); } while (0)

/// check if pin is an input
#define _GET_INPUT(IO) ((IO ## _DDR & MASK(IO ## _PIN)) == 0)
/// check if pin is an output
#define _GET_OUTPUT(IO) ((IO ## _DDR & MASK(IO ## _PIN)) != 0)

// why double up on these macros? see http://gcc.gnu.org/onlinedocs/cpp/Stringification.html

/// Read a pin wrapper
#define READ(IO) _READ(IO)
/// Write to a pin wrapper
#define WRITE(IO, v) _WRITE(IO, v)
/// toggle a pin wrapper
#define TOGGLE(IO) _TOGGLE(IO)

/// set pin as input wrapper
#define SET_INPUT(IO) _SET_INPUT(IO)
/// set pin as output wrapper
#define SET_OUTPUT(IO) _SET_OUTPUT(IO)

/// check if pin is an input wrapper
#define GET_INPUT(IO) _GET_INPUT(IO)
/// check if pin is an output wrapper
#define GET_OUTPUT(IO) _GET_OUTPUT(IO)

/*
ports and functions

added as necessary or if I feel like it- not a comprehensive list!
*/

#if defined (__AVR_ATmega168__) || defined (__AVR_ATmega328__) || defined (__AVR_ATmega328P__)
#include "arduino_168_328p.h"
#endif /* _AVR_ATmega{168,328,328P}__ */

#if defined (__AVR_ATmega644__) || defined (__AVR_ATmega644P__) || defined (__AVR_ATmega644PA__)
#include "arduino_644.h"
#endif /* _AVR_ATmega{644,644P,644PA}__ */

#if defined (__AVR_ATmega1280__)
#include "arduino_1280.h"
#endif /* __AVR_ATmega1280__ */

#if defined (__AVR_ATmega2560__)
#include "arduino_1280.h" //2560 has the same pins and ports so we can reuse the 1280 file.
#endif

#if defined (__AVR_AT90USB1287__)
#include "arduino_usb1287.h"
#endif

#ifndef DIO0_PIN
#error pins for this chip not defined in arduino.h! If you write an appropriate pin definition and have this firmware work on your chip, please tell us via the forum thread
#endif

#endif /* _ARDUINO_H */
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