extruder/arduino.h

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#ifndef _ARDUINO_H
#define _ARDUINO_H

#include  <avr/io.h>

/*
  utility functions
*/

#ifndef   MASK

  #define   MASK(PIN)       (1 << PIN)
#endif

/*
  magic I/O routines

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

#define   _READ(IO)         (IO ## _RPORT & MASK(IO ## _PIN))

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

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

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

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

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

#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

#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  /*  _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 */