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