arduino.h

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#ifndef _ARDUINO_H
#define _ARDUINO_H

#include <avr/io.h>

/*
  magic I/O routines

  now you can simply SET_OUTPUT(STEP); WRITE(STEP, 1); WRITE(STEP, 0);
*/
#define _READ(IO) (IO ## _RPORT & _BV(IO ## _PIN))

#define _WRITE(IO, v) do { \
  if (v) { IO ## _WPORT |= _BV(IO ## _PIN); }\
  else { IO ## _WPORT &= ~_BV(IO ## _PIN); };\
} while (0)

#define _TOGGLE(IO) do { IO ## _RPORT = _BV(IO ## _PIN); } while (0)

#define _SET_INPUT(IO) do { IO ## _DDR &= ~_BV(IO ## _PIN); } while (0)

#define _SET_OUTPUT(IO) do { IO ## _DDR |= _BV(IO ## _PIN); } while (0)

#define _GET_INPUT(IO) ((IO ## _DDR & _BV(IO ## _PIN)) == 0)

#define _GET_OUTPUT(IO) ((IO ## _DDR & _BV(IO ## _PIN)) != 0)

//  why double up on these macros? see http://gcc.gnu.org/onlinedocs/cpp/Stringification.html
#define READ(IO) _READ(IO)

#define WRITE(IO, v)  _WRITE(IO, v)

#define TOGGLE(IO) _TOGGLE(IO)

#define SET_INPUT(IO)  _SET_INPUT(IO)

#define SET_OUTPUT(IO) _SET_OUTPUT(IO)

#define GET_INPUT(IO)  _GET_INPUT(IO)

#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

#if defined (__AVR_ATmega644__) || defined (__AVR_ATmega644P__) || \
    defined (__AVR_ATmega644PA__) || defined (__AVR_ATmega1284__) || \
    defined (__AVR_ATmega1284P__)
#  include "arduino_644.h"
#endif

#if defined (__AVR_ATmega1280__) || defined (__AVR_ATmega2560__)
#  include "arduino_1280.h"
#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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