interrupt_pins.h

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// interrupt pins for known boards

// Teensy (and maybe others) define these automatically
#if !defined(CORE_NUM_INTERRUPT)

// Wiring boards
#if defined(WIRING)
  #define CORE_NUM_INTERRUPT    NUM_EXTERNAL_INTERRUPTS
  #if NUM_EXTERNAL_INTERRUPTS > 0
  #define CORE_INT0_PIN         EI0
  #endif
  #if NUM_EXTERNAL_INTERRUPTS > 1
  #define CORE_INT1_PIN         EI1
  #endif
  #if NUM_EXTERNAL_INTERRUPTS > 2
  #define CORE_INT2_PIN         EI2
  #endif
  #if NUM_EXTERNAL_INTERRUPTS > 3
  #define CORE_INT3_PIN         EI3
  #endif
  #if NUM_EXTERNAL_INTERRUPTS > 4
  #define CORE_INT4_PIN         EI4
  #endif
  #if NUM_EXTERNAL_INTERRUPTS > 5
  #define CORE_INT5_PIN         EI5
  #endif
  #if NUM_EXTERNAL_INTERRUPTS > 6
  #define CORE_INT6_PIN         EI6
  #endif
  #if NUM_EXTERNAL_INTERRUPTS > 7
  #define CORE_INT7_PIN         EI7
  #endif

// Arduino Uno, Duemilanove, Diecimila, LilyPad, Mini, Fio, etc...
#elif defined(__AVR_ATmega328P__) || defined(__AVR_ATmega168__) || defined(__AVR_ATmega8__)
  #define CORE_NUM_INTERRUPT    2
  #define CORE_INT0_PIN         2
  #define CORE_INT1_PIN         3

// Arduino Mega
#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
  #define CORE_NUM_INTERRUPT    6
  #define CORE_INT0_PIN         2
  #define CORE_INT1_PIN         3
  #define CORE_INT2_PIN         21
  #define CORE_INT3_PIN         20
  #define CORE_INT4_PIN         19
  #define CORE_INT5_PIN         18

// Arduino Leonardo (untested)
#elif defined(__AVR_ATmega32U4__) && !defined(CORE_TEENSY)
  #define CORE_NUM_INTERRUPT    4
  #define CORE_INT0_PIN         3
  #define CORE_INT1_PIN         2
  #define CORE_INT2_PIN         0
  #define CORE_INT3_PIN         1

// Sanguino (untested)
#elif defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644__)
  #define CORE_NUM_INTERRUPT    3
  #define CORE_INT0_PIN         10
  #define CORE_INT1_PIN         11
  #define CORE_INT2_PIN         2

// Chipkit Uno32 - attachInterrupt may not support CHANGE option
#elif defined(__PIC32MX__) && defined(_BOARD_UNO_)
  #define CORE_NUM_INTERRUPT    5
  #define CORE_INT0_PIN         38
  #define CORE_INT1_PIN         2
  #define CORE_INT2_PIN         7
  #define CORE_INT3_PIN         8
  #define CORE_INT4_PIN         35

// Chipkit Uno32 - attachInterrupt may not support CHANGE option
#elif defined(__PIC32MX__) && defined(_BOARD_MEGA_)
  #define CORE_NUM_INTERRUPT    5
  #define CORE_INT0_PIN         3
  #define CORE_INT1_PIN         2
  #define CORE_INT2_PIN         7
  #define CORE_INT3_PIN         21
  #define CORE_INT4_PIN         20

// http://hlt.media.mit.edu/?p=1229
#elif defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
  #define CORE_NUM_INTERRUPT    1
  #define CORE_INT0_PIN         2

// Arduino Due (untested)
#elif defined(__SAM3X8E__) 
  #define CORE_NUM_INTERRUPT    54
  #define CORE_INT0_PIN         0
  #define CORE_INT1_PIN         1
  #define CORE_INT2_PIN         2
  #define CORE_INT3_PIN         3
  #define CORE_INT4_PIN         4
  #define CORE_INT5_PIN         5
  #define CORE_INT6_PIN         6
  #define CORE_INT7_PIN         7
  #define CORE_INT8_PIN         8
  #define CORE_INT9_PIN         9
  #define CORE_INT10_PIN        10
  #define CORE_INT11_PIN        11
  #define CORE_INT12_PIN        12
  #define CORE_INT13_PIN        13
  #define CORE_INT14_PIN        14
  #define CORE_INT15_PIN        15
  #define CORE_INT16_PIN        16
  #define CORE_INT17_PIN        17
  #define CORE_INT18_PIN        18
  #define CORE_INT19_PIN        19
  #define CORE_INT20_PIN        20
  #define CORE_INT21_PIN        21
  #define CORE_INT22_PIN        22
  #define CORE_INT23_PIN        23
  #define CORE_INT24_PIN        24
  #define CORE_INT25_PIN        25
  #define CORE_INT26_PIN        26
  #define CORE_INT27_PIN        27
  #define CORE_INT28_PIN        28
  #define CORE_INT29_PIN        29
  #define CORE_INT30_PIN        30
  #define CORE_INT31_PIN        31
  #define CORE_INT32_PIN        32
  #define CORE_INT33_PIN        33
  #define CORE_INT34_PIN        34
  #define CORE_INT35_PIN        35
  #define CORE_INT36_PIN        36
  #define CORE_INT37_PIN        37
  #define CORE_INT38_PIN        38
  #define CORE_INT39_PIN        39
  #define CORE_INT40_PIN        40
  #define CORE_INT41_PIN        41
  #define CORE_INT42_PIN        42
  #define CORE_INT43_PIN        43
  #define CORE_INT44_PIN        44
  #define CORE_INT45_PIN        45
  #define CORE_INT46_PIN        46
  #define CORE_INT47_PIN        47
  #define CORE_INT48_PIN        48
  #define CORE_INT49_PIN        49
  #define CORE_INT50_PIN        50
  #define CORE_INT51_PIN        51
  #define CORE_INT52_PIN        52
  #define CORE_INT53_PIN        53

#endif
#endif

#if !defined(CORE_NUM_INTERRUPT)
#error "Interrupts are unknown for this board, please add to this code"
#endif
#if CORE_NUM_INTERRUPT <= 0
#error "Encoder requires interrupt pins, but this board does not have any :("
#error "You could try defining ENCODER_DO_NOT_USE_INTERRUPTS as a kludge."
#endif