Encoder.h

/* Encoder Library, for measuring quadrature encoded signals
 * http://www.pjrc.com/teensy/td_libs_Encoder.html
 * Copyright (c) 2011,2013 PJRC.COM, LLC - Paul Stoffregen <paul@pjrc.com>
 *
 * Version 1.1 - expand to support boards with up to 60 interrupts
 * Version 1.0 - initial release
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */


#ifndef Encoder_h_
#define Encoder_h_

#if defined(ARDUINO) && ARDUINO >= 100
#include "Arduino.h"
#elif defined(WIRING)
#include "Wiring.h"
#else
#include "WProgram.h"
#include "pins_arduino.h"
#endif

#include "utility/direct_pin_read.h"

#if defined(ENCODER_USE_INTERRUPTS) || !defined(ENCODER_DO_NOT_USE_INTERRUPTS)
#define ENCODER_USE_INTERRUPTS
#define ENCODER_ARGLIST_SIZE CORE_NUM_INTERRUPT
#include "utility/interrupt_pins.h"
#ifdef ENCODER_OPTIMIZE_INTERRUPTS
#include "utility/interrupt_config.h"
#endif
#else
#define ENCODER_ARGLIST_SIZE 0
#endif



// All the data needed by interrupts is consolidated into this ugly struct
// to facilitate assembly language optimizing of the speed critical update.
// The assembly code uses auto-incrementing addressing modes, so the struct
// must remain in exactly this order.
typedef struct {
	volatile IO_REG_TYPE * pin1_register;
	volatile IO_REG_TYPE * pin2_register;
	IO_REG_TYPE            pin1_bitmask;
	IO_REG_TYPE            pin2_bitmask;
	uint8_t                state;
	int32_t                position;
} Encoder_internal_state_t;

class Encoder
{
public:
	Encoder(uint8_t pin1, uint8_t pin2) {
		#ifdef INPUT_PULLUP
		pinMode(pin1, INPUT_PULLUP);
		pinMode(pin2, INPUT_PULLUP);
		#else
		pinMode(pin1, INPUT);
		digitalWrite(pin1, HIGH);
		pinMode(pin2, INPUT);
		digitalWrite(pin2, HIGH);
		#endif
		encoder.pin1_register = PIN_TO_BASEREG(pin1);
		encoder.pin1_bitmask = PIN_TO_BITMASK(pin1);
		encoder.pin2_register = PIN_TO_BASEREG(pin2);
		encoder.pin2_bitmask = PIN_TO_BITMASK(pin2);
		encoder.position = 0;
		// allow time for a passive R-C filter to charge
		// through the pullup resistors, before reading
		// the initial state
		delayMicroseconds(2000);
		uint8_t s = 0;
		if (DIRECT_PIN_READ(encoder.pin1_register, encoder.pin1_bitmask)) s |= 1;
		if (DIRECT_PIN_READ(encoder.pin2_register, encoder.pin2_bitmask)) s |= 2;
		encoder.state = s;
#ifdef ENCODER_USE_INTERRUPTS
		interrupts_in_use = attach_interrupt(pin1, &encoder);
		interrupts_in_use += attach_interrupt(pin2, &encoder);
#endif
		//update_finishup();  // to force linker to include the code (does not work)
	}


#ifdef ENCODER_USE_INTERRUPTS
	inline int32_t read() {
		if (interrupts_in_use < 2) {
			noInterrupts();
			update(&encoder);
		} else {
			noInterrupts();
		}
		int32_t ret = encoder.position;
		interrupts();
		return ret;
	}
	inline void write(int32_t p) {
		noInterrupts();
		encoder.position = p;
		interrupts();
	}
#else
	inline int32_t read() {
		update(&encoder);
		return encoder.position;
	}
	inline void write(int32_t p) {
		encoder.position = p;
	}
#endif
private:
	Encoder_internal_state_t encoder;
#ifdef ENCODER_USE_INTERRUPTS
	uint8_t interrupts_in_use;
#endif
public:
	static Encoder_internal_state_t * interruptArgs[ENCODER_ARGLIST_SIZE];

//                           _______         _______       
//               Pin1 ______|       |_______|       |______ Pin1
// negative <---         _______         _______         __      --> positive
//               Pin2 __|       |_______|       |_______|   Pin2

		//	new	new	old	old
		//	pin2	pin1	pin2	pin1	Result
		//	----	----	----	----	------
		//	0	0	0	0	no movement
		//	0	0	0	1	+1
		//	0	0	1	0	-1
		//	0	0	1	1	+2  (assume pin1 edges only)
		//	0	1	0	0	-1
		//	0	1	0	1	no movement
		//	0	1	1	0	-2  (assume pin1 edges only)
		//	0	1	1	1	+1
		//	1	0	0	0	+1
		//	1	0	0	1	-2  (assume pin1 edges only)
		//	1	0	1	0	no movement
		//	1	0	1	1	-1
		//	1	1	0	0	+2  (assume pin1 edges only)
		//	1	1	0	1	-1
		//	1	1	1	0	+1
		//	1	1	1	1	no movement
/*
	// Simple, easy-to-read "documentation" version :-)
	//
	void update(void) {
		uint8_t s = state & 3;
		if (digitalRead(pin1)) s |= 4;
		if (digitalRead(pin2)) s |= 8;
		switch (s) {
			case 0: case 5: case 10: case 15:
				break;
			case 1: case 7: case 8: case 14:
				position++; break;
			case 2: case 4: case 11: case 13:
				position--; break;
			case 3: case 12:
				position += 2; break;
			default:
				position -= 2; break;
		}
		state = (s >> 2);
	}
*/

private:
	static void update(Encoder_internal_state_t *arg) {
#if defined(__AVR__)
		// The compiler believes this is just 1 line of code, so
		// it will inline this function into each interrupt
		// handler.  That's a tiny bit faster, but grows the code.
		// Especially when used with ENCODER_OPTIMIZE_INTERRUPTS,
		// the inline nature allows the ISR prologue and epilogue
		// to only save/restore necessary registers, for very nice
		// speed increase.
		asm volatile (
			"ld	r30, X+"		"\n\t"
			"ld	r31, X+"		"\n\t"
			"ld	r24, Z"			"\n\t"	// r24 = pin1 input
			"ld	r30, X+"		"\n\t"
			"ld	r31, X+"		"\n\t"
			"ld	r25, Z"			"\n\t"  // r25 = pin2 input
			"ld	r30, X+"		"\n\t"  // r30 = pin1 mask
			"ld	r31, X+"		"\n\t"	// r31 = pin2 mask
			"ld	r22, X"			"\n\t"	// r22 = state
			"andi	r22, 3"			"\n\t"
			"and	r24, r30"		"\n\t"
			"breq	L%=1"			"\n\t"	// if (pin1)
			"ori	r22, 4"			"\n\t"	//	state |= 4
		"L%=1:"	"and	r25, r31"		"\n\t"
			"breq	L%=2"			"\n\t"	// if (pin2)
			"ori	r22, 8"			"\n\t"	//	state |= 8
		"L%=2:" "ldi	r30, lo8(pm(L%=table))"	"\n\t"
			"ldi	r31, hi8(pm(L%=table))"	"\n\t"
			"add	r30, r22"		"\n\t"
			"adc	r31, __zero_reg__"	"\n\t"
			"asr	r22"			"\n\t"
			"asr	r22"			"\n\t"
			"st	X+, r22"		"\n\t"  // store new state
			"ld	r22, X+"		"\n\t"
			"ld	r23, X+"		"\n\t"
			"ld	r24, X+"		"\n\t"
			"ld	r25, X+"		"\n\t"
			"ijmp"				"\n\t"	// jumps to update_finishup()
			// TODO move this table to another static function,
			// so it doesn't get needlessly duplicated.  Easier
			// said than done, due to linker issues and inlining
		"L%=table:"				"\n\t"
			"rjmp	L%=end"			"\n\t"	// 0
			"rjmp	L%=plus1"		"\n\t"	// 1
			"rjmp	L%=minus1"		"\n\t"	// 2
			"rjmp	L%=plus2"		"\n\t"	// 3
			"rjmp	L%=minus1"		"\n\t"	// 4
			"rjmp	L%=end"			"\n\t"	// 5
			"rjmp	L%=minus2"		"\n\t"	// 6
			"rjmp	L%=plus1"		"\n\t"	// 7
			"rjmp	L%=plus1"		"\n\t"	// 8
			"rjmp	L%=minus2"		"\n\t"	// 9
			"rjmp	L%=end"			"\n\t"	// 10
			"rjmp	L%=minus1"		"\n\t"	// 11
			"rjmp	L%=plus2"		"\n\t"	// 12
			"rjmp	L%=minus1"		"\n\t"	// 13
			"rjmp	L%=plus1"		"\n\t"	// 14
			"rjmp	L%=end"			"\n\t"	// 15
		"L%=minus2:"				"\n\t"
			"subi	r22, 2"			"\n\t"
			"sbci	r23, 0"			"\n\t"
			"sbci	r24, 0"			"\n\t"
			"sbci	r25, 0"			"\n\t"
			"rjmp	L%=store"		"\n\t"
		"L%=minus1:"				"\n\t"
			"subi	r22, 1"			"\n\t"
			"sbci	r23, 0"			"\n\t"
			"sbci	r24, 0"			"\n\t"
			"sbci	r25, 0"			"\n\t"
			"rjmp	L%=store"		"\n\t"
		"L%=plus2:"				"\n\t"
			"subi	r22, 254"		"\n\t"
			"rjmp	L%=z"			"\n\t"
		"L%=plus1:"				"\n\t"
			"subi	r22, 255"		"\n\t"
		"L%=z:"	"sbci	r23, 255"		"\n\t"
			"sbci	r24, 255"		"\n\t"
			"sbci	r25, 255"		"\n\t"
		"L%=store:"				"\n\t"
			"st	-X, r25"		"\n\t"
			"st	-X, r24"		"\n\t"
			"st	-X, r23"		"\n\t"
			"st	-X, r22"		"\n\t"
		"L%=end:"				"\n"
		: : "x" (arg) : "r22", "r23", "r24", "r25", "r30", "r31");
#else
		uint8_t p1val = DIRECT_PIN_READ(arg->pin1_register, arg->pin1_bitmask);
		uint8_t p2val = DIRECT_PIN_READ(arg->pin2_register, arg->pin2_bitmask);
		uint8_t state = arg->state & 3;
		if (p1val) state |= 4;
		if (p2val) state |= 8;
		arg->state = (state >> 2);
		switch (state) {
			case 1: case 7: case 8: case 14:
				arg->position++;
				return;
			case 2: case 4: case 11: case 13:
				arg->position--;
				return;
			case 3: case 12:
				arg->position += 2;
				return;
			case 6: case 9:
				arg->position += 2;
				return;
		}
#endif
	}
/*
#if defined(__AVR__)
	// TODO: this must be a no inline function
	// even noinline does not seem to solve difficult
	// problems with this.  Oh well, it was only meant
	// to shrink code size - there's no performance
	// improvement in this, only code size reduction.
	__attribute__((noinline)) void update_finishup(void) {
		asm volatile (
			"ldi	r30, lo8(pm(Ltable))"	"\n\t"
			"ldi	r31, hi8(pm(Ltable))"	"\n\t"
		"Ltable:"				"\n\t"
			"rjmp	L%=end"			"\n\t"	// 0
			"rjmp	L%=plus1"		"\n\t"	// 1
			"rjmp	L%=minus1"		"\n\t"	// 2
			"rjmp	L%=plus2"		"\n\t"	// 3
			"rjmp	L%=minus1"		"\n\t"	// 4
			"rjmp	L%=end"			"\n\t"	// 5
			"rjmp	L%=minus2"		"\n\t"	// 6
			"rjmp	L%=plus1"		"\n\t"	// 7
			"rjmp	L%=plus1"		"\n\t"	// 8
			"rjmp	L%=minus2"		"\n\t"	// 9
			"rjmp	L%=end"			"\n\t"	// 10
			"rjmp	L%=minus1"		"\n\t"	// 11
			"rjmp	L%=plus2"		"\n\t"	// 12
			"rjmp	L%=minus1"		"\n\t"	// 13
			"rjmp	L%=plus1"		"\n\t"	// 14
			"rjmp	L%=end"			"\n\t"	// 15
		"L%=minus2:"				"\n\t"
			"subi	r22, 2"			"\n\t"
			"sbci	r23, 0"			"\n\t"
			"sbci	r24, 0"			"\n\t"
			"sbci	r25, 0"			"\n\t"
			"rjmp	L%=store"		"\n\t"
		"L%=minus1:"				"\n\t"
			"subi	r22, 1"			"\n\t"
			"sbci	r23, 0"			"\n\t"
			"sbci	r24, 0"			"\n\t"
			"sbci	r25, 0"			"\n\t"
			"rjmp	L%=store"		"\n\t"
		"L%=plus2:"				"\n\t"
			"subi	r22, 254"		"\n\t"
			"rjmp	L%=z"			"\n\t"
		"L%=plus1:"				"\n\t"
			"subi	r22, 255"		"\n\t"
		"L%=z:"	"sbci	r23, 255"		"\n\t"
			"sbci	r24, 255"		"\n\t"
			"sbci	r25, 255"		"\n\t"
		"L%=store:"				"\n\t"
			"st	-X, r25"		"\n\t"
			"st	-X, r24"		"\n\t"
			"st	-X, r23"		"\n\t"
			"st	-X, r22"		"\n\t"
		"L%=end:"				"\n"
		: : : "r22", "r23", "r24", "r25", "r30", "r31");
	}
#endif
*/


#ifdef ENCODER_USE_INTERRUPTS
	// this giant function is an unfortunate consequence of Arduino's
	// attachInterrupt function not supporting any way to pass a pointer
	// or other context to the attached function.
	static uint8_t attach_interrupt(uint8_t pin, Encoder_internal_state_t *state) {
		switch (pin) {
		#ifdef CORE_INT0_PIN
			case CORE_INT0_PIN:
				interruptArgs[0] = state;
				attachInterrupt(0, isr0, CHANGE);
				break;
		#endif
		#ifdef CORE_INT1_PIN
			case CORE_INT1_PIN:
				interruptArgs[1] = state;
				attachInterrupt(1, isr1, CHANGE);
				break;
		#endif
		#ifdef CORE_INT2_PIN
			case CORE_INT2_PIN:
				interruptArgs[2] = state;
				attachInterrupt(2, isr2, CHANGE);
				break;
		#endif
		#ifdef CORE_INT3_PIN
			case CORE_INT3_PIN:
				interruptArgs[3] = state;
				attachInterrupt(3, isr3, CHANGE);
				break;
		#endif
		#ifdef CORE_INT4_PIN
			case CORE_INT4_PIN:
				interruptArgs[4] = state;
				attachInterrupt(4, isr4, CHANGE);
				break;
		#endif
		#ifdef CORE_INT5_PIN
			case CORE_INT5_PIN:
				interruptArgs[5] = state;
				attachInterrupt(5, isr5, CHANGE);
				break;
		#endif
		#ifdef CORE_INT6_PIN
			case CORE_INT6_PIN:
				interruptArgs[6] = state;
				attachInterrupt(6, isr6, CHANGE);
				break;
		#endif
		#ifdef CORE_INT7_PIN
			case CORE_INT7_PIN:
				interruptArgs[7] = state;
				attachInterrupt(7, isr7, CHANGE);
				break;
		#endif
		#ifdef CORE_INT8_PIN
			case CORE_INT8_PIN:
				interruptArgs[8] = state;
				attachInterrupt(8, isr8, CHANGE);
				break;
		#endif
		#ifdef CORE_INT9_PIN
			case CORE_INT9_PIN:
				interruptArgs[9] = state;
				attachInterrupt(9, isr9, CHANGE);
				break;
		#endif
		#ifdef CORE_INT10_PIN
			case CORE_INT10_PIN:
				interruptArgs[10] = state;
				attachInterrupt(10, isr10, CHANGE);
				break;
		#endif
		#ifdef CORE_INT11_PIN
			case CORE_INT11_PIN:
				interruptArgs[11] = state;
				attachInterrupt(11, isr11, CHANGE);
				break;
		#endif
		#ifdef CORE_INT12_PIN
			case CORE_INT12_PIN:
				interruptArgs[12] = state;
				attachInterrupt(12, isr12, CHANGE);
				break;
		#endif
		#ifdef CORE_INT13_PIN
			case CORE_INT13_PIN:
				interruptArgs[13] = state;
				attachInterrupt(13, isr13, CHANGE);
				break;
		#endif
		#ifdef CORE_INT14_PIN
			case CORE_INT14_PIN:
				interruptArgs[14] = state;
				attachInterrupt(14, isr14, CHANGE);
				break;
		#endif
		#ifdef CORE_INT15_PIN
			case CORE_INT15_PIN:
				interruptArgs[15] = state;
				attachInterrupt(15, isr15, CHANGE);
				break;
		#endif
		#ifdef CORE_INT16_PIN
			case CORE_INT16_PIN:
				interruptArgs[16] = state;
				attachInterrupt(16, isr16, CHANGE);
				break;
		#endif
		#ifdef CORE_INT17_PIN
			case CORE_INT17_PIN:
				interruptArgs[17] = state;
				attachInterrupt(17, isr17, CHANGE);
				break;
		#endif
		#ifdef CORE_INT18_PIN
			case CORE_INT18_PIN:
				interruptArgs[18] = state;
				attachInterrupt(18, isr18, CHANGE);
				break;
		#endif
		#ifdef CORE_INT19_PIN
			case CORE_INT19_PIN:
				interruptArgs[19] = state;
				attachInterrupt(19, isr19, CHANGE);
				break;
		#endif
		#ifdef CORE_INT20_PIN
			case CORE_INT20_PIN:
				interruptArgs[20] = state;
				attachInterrupt(20, isr20, CHANGE);
				break;
		#endif
		#ifdef CORE_INT21_PIN
			case CORE_INT21_PIN:
				interruptArgs[21] = state;
				attachInterrupt(21, isr21, CHANGE);
				break;
		#endif
		#ifdef CORE_INT22_PIN
			case CORE_INT22_PIN:
				interruptArgs[22] = state;
				attachInterrupt(22, isr22, CHANGE);
				break;
		#endif
		#ifdef CORE_INT23_PIN
			case CORE_INT23_PIN:
				interruptArgs[23] = state;
				attachInterrupt(23, isr23, CHANGE);
				break;
		#endif
		#ifdef CORE_INT24_PIN
			case CORE_INT24_PIN:
				interruptArgs[24] = state;
				attachInterrupt(24, isr24, CHANGE);
				break;
		#endif
		#ifdef CORE_INT25_PIN
			case CORE_INT25_PIN:
				interruptArgs[25] = state;
				attachInterrupt(25, isr25, CHANGE);
				break;
		#endif
		#ifdef CORE_INT26_PIN
			case CORE_INT26_PIN:
				interruptArgs[26] = state;
				attachInterrupt(26, isr26, CHANGE);
				break;
		#endif
		#ifdef CORE_INT27_PIN
			case CORE_INT27_PIN:
				interruptArgs[27] = state;
				attachInterrupt(27, isr27, CHANGE);
				break;
		#endif
		#ifdef CORE_INT28_PIN
			case CORE_INT28_PIN:
				interruptArgs[28] = state;
				attachInterrupt(28, isr28, CHANGE);
				break;
		#endif
		#ifdef CORE_INT29_PIN
			case CORE_INT29_PIN:
				interruptArgs[29] = state;
				attachInterrupt(29, isr29, CHANGE);
				break;
		#endif

		#ifdef CORE_INT30_PIN
			case CORE_INT30_PIN:
				interruptArgs[30] = state;
				attachInterrupt(30, isr30, CHANGE);
				break;
		#endif
		#ifdef CORE_INT31_PIN
			case CORE_INT31_PIN:
				interruptArgs[31] = state;
				attachInterrupt(31, isr31, CHANGE);
				break;
		#endif
		#ifdef CORE_INT32_PIN
			case CORE_INT32_PIN:
				interruptArgs[32] = state;
				attachInterrupt(32, isr32, CHANGE);
				break;
		#endif
		#ifdef CORE_INT33_PIN
			case CORE_INT33_PIN:
				interruptArgs[33] = state;
				attachInterrupt(33, isr33, CHANGE);
				break;
		#endif
		#ifdef CORE_INT34_PIN
			case CORE_INT34_PIN:
				interruptArgs[34] = state;
				attachInterrupt(34, isr34, CHANGE);
				break;
		#endif
		#ifdef CORE_INT35_PIN
			case CORE_INT35_PIN:
				interruptArgs[35] = state;
				attachInterrupt(35, isr35, CHANGE);
				break;
		#endif
		#ifdef CORE_INT36_PIN
			case CORE_INT36_PIN:
				interruptArgs[36] = state;
				attachInterrupt(36, isr36, CHANGE);
				break;
		#endif
		#ifdef CORE_INT37_PIN
			case CORE_INT37_PIN:
				interruptArgs[37] = state;
				attachInterrupt(37, isr37, CHANGE);
				break;
		#endif
		#ifdef CORE_INT38_PIN
			case CORE_INT38_PIN:
				interruptArgs[38] = state;
				attachInterrupt(38, isr38, CHANGE);
				break;
		#endif
		#ifdef CORE_INT39_PIN
			case CORE_INT39_PIN:
				interruptArgs[39] = state;
				attachInterrupt(39, isr39, CHANGE);
				break;
		#endif
		#ifdef CORE_INT40_PIN
			case CORE_INT40_PIN:
				interruptArgs[40] = state;
				attachInterrupt(40, isr40, CHANGE);
				break;
		#endif
		#ifdef CORE_INT41_PIN
			case CORE_INT41_PIN:
				interruptArgs[41] = state;
				attachInterrupt(41, isr41, CHANGE);
				break;
		#endif
		#ifdef CORE_INT42_PIN
			case CORE_INT42_PIN:
				interruptArgs[42] = state;
				attachInterrupt(42, isr42, CHANGE);
				break;
		#endif
		#ifdef CORE_INT43_PIN
			case CORE_INT43_PIN:
				interruptArgs[43] = state;
				attachInterrupt(43, isr43, CHANGE);
				break;
		#endif
		#ifdef CORE_INT44_PIN
			case CORE_INT44_PIN:
				interruptArgs[44] = state;
				attachInterrupt(44, isr44, CHANGE);
				break;
		#endif
		#ifdef CORE_INT45_PIN
			case CORE_INT45_PIN:
				interruptArgs[45] = state;
				attachInterrupt(45, isr45, CHANGE);
				break;
		#endif
		#ifdef CORE_INT46_PIN
			case CORE_INT46_PIN:
				interruptArgs[46] = state;
				attachInterrupt(46, isr46, CHANGE);
				break;
		#endif
		#ifdef CORE_INT47_PIN
			case CORE_INT47_PIN:
				interruptArgs[47] = state;
				attachInterrupt(47, isr47, CHANGE);
				break;
		#endif
		#ifdef CORE_INT48_PIN
			case CORE_INT48_PIN:
				interruptArgs[48] = state;
				attachInterrupt(48, isr48, CHANGE);
				break;
		#endif
		#ifdef CORE_INT49_PIN
			case CORE_INT49_PIN:
				interruptArgs[49] = state;
				attachInterrupt(49, isr49, CHANGE);
				break;
		#endif
		#ifdef CORE_INT50_PIN
			case CORE_INT50_PIN:
				interruptArgs[50] = state;
				attachInterrupt(50, isr50, CHANGE);
				break;
		#endif
		#ifdef CORE_INT51_PIN
			case CORE_INT51_PIN:
				interruptArgs[51] = state;
				attachInterrupt(51, isr51, CHANGE);
				break;
		#endif
		#ifdef CORE_INT52_PIN
			case CORE_INT52_PIN:
				interruptArgs[52] = state;
				attachInterrupt(52, isr52, CHANGE);
				break;
		#endif
		#ifdef CORE_INT53_PIN
			case CORE_INT53_PIN:
				interruptArgs[53] = state;
				attachInterrupt(53, isr53, CHANGE);
				break;
		#endif
		#ifdef CORE_INT54_PIN
			case CORE_INT54_PIN:
				interruptArgs[54] = state;
				attachInterrupt(54, isr54, CHANGE);
				break;
		#endif
		#ifdef CORE_INT55_PIN
			case CORE_INT55_PIN:
				interruptArgs[55] = state;
				attachInterrupt(55, isr55, CHANGE);
				break;
		#endif
		#ifdef CORE_INT56_PIN
			case CORE_INT56_PIN:
				interruptArgs[56] = state;
				attachInterrupt(56, isr56, CHANGE);
				break;
		#endif
		#ifdef CORE_INT57_PIN
			case CORE_INT57_PIN:
				interruptArgs[57] = state;
				attachInterrupt(57, isr57, CHANGE);
				break;
		#endif
		#ifdef CORE_INT58_PIN
			case CORE_INT58_PIN:
				interruptArgs[58] = state;
				attachInterrupt(58, isr58, CHANGE);
				break;
		#endif
		#ifdef CORE_INT59_PIN
			case CORE_INT59_PIN:
				interruptArgs[59] = state;
				attachInterrupt(59, isr59, CHANGE);
				break;
		#endif
			default:
				return 0;
		}
		return 1;
	}
#endif // ENCODER_USE_INTERRUPTS


#if defined(ENCODER_USE_INTERRUPTS) && !defined(ENCODER_OPTIMIZE_INTERRUPTS)
	#ifdef CORE_INT0_PIN
	static void isr0(void) { update(interruptArgs[0]); }
	#endif
	#ifdef CORE_INT1_PIN
	static void isr1(void) { update(interruptArgs[1]); }
	#endif
	#ifdef CORE_INT2_PIN
	static void isr2(void) { update(interruptArgs[2]); }
	#endif
	#ifdef CORE_INT3_PIN
	static void isr3(void) { update(interruptArgs[3]); }
	#endif
	#ifdef CORE_INT4_PIN
	static void isr4(void) { update(interruptArgs[4]); }
	#endif
	#ifdef CORE_INT5_PIN
	static void isr5(void) { update(interruptArgs[5]); }
	#endif
	#ifdef CORE_INT6_PIN
	static void isr6(void) { update(interruptArgs[6]); }
	#endif
	#ifdef CORE_INT7_PIN
	static void isr7(void) { update(interruptArgs[7]); }
	#endif
	#ifdef CORE_INT8_PIN
	static void isr8(void) { update(interruptArgs[8]); }
	#endif
	#ifdef CORE_INT9_PIN
	static void isr9(void) { update(interruptArgs[9]); }
	#endif
	#ifdef CORE_INT10_PIN
	static void isr10(void) { update(interruptArgs[10]); }
	#endif
	#ifdef CORE_INT11_PIN
	static void isr11(void) { update(interruptArgs[11]); }
	#endif
	#ifdef CORE_INT12_PIN
	static void isr12(void) { update(interruptArgs[12]); }
	#endif
	#ifdef CORE_INT13_PIN
	static void isr13(void) { update(interruptArgs[13]); }
	#endif
	#ifdef CORE_INT14_PIN
	static void isr14(void) { update(interruptArgs[14]); }
	#endif
	#ifdef CORE_INT15_PIN
	static void isr15(void) { update(interruptArgs[15]); }
	#endif
	#ifdef CORE_INT16_PIN
	static void isr16(void) { update(interruptArgs[16]); }
	#endif
	#ifdef CORE_INT17_PIN
	static void isr17(void) { update(interruptArgs[17]); }
	#endif
	#ifdef CORE_INT18_PIN
	static void isr18(void) { update(interruptArgs[18]); }
	#endif
	#ifdef CORE_INT19_PIN
	static void isr19(void) { update(interruptArgs[19]); }
	#endif
	#ifdef CORE_INT20_PIN
	static void isr20(void) { update(interruptArgs[20]); }
	#endif
	#ifdef CORE_INT21_PIN
	static void isr21(void) { update(interruptArgs[21]); }
	#endif
	#ifdef CORE_INT22_PIN
	static void isr22(void) { update(interruptArgs[22]); }
	#endif
	#ifdef CORE_INT23_PIN
	static void isr23(void) { update(interruptArgs[23]); }
	#endif
	#ifdef CORE_INT24_PIN
	static void isr24(void) { update(interruptArgs[24]); }
	#endif
	#ifdef CORE_INT25_PIN
	static void isr25(void) { update(interruptArgs[25]); }
	#endif
	#ifdef CORE_INT26_PIN
	static void isr26(void) { update(interruptArgs[26]); }
	#endif
	#ifdef CORE_INT27_PIN
	static void isr27(void) { update(interruptArgs[27]); }
	#endif
	#ifdef CORE_INT28_PIN
	static void isr28(void) { update(interruptArgs[28]); }
	#endif
	#ifdef CORE_INT29_PIN
	static void isr29(void) { update(interruptArgs[29]); }
	#endif
	#ifdef CORE_INT30_PIN
	static void isr30(void) { update(interruptArgs[30]); }
	#endif
	#ifdef CORE_INT31_PIN
	static void isr31(void) { update(interruptArgs[31]); }
	#endif
	#ifdef CORE_INT32_PIN
	static void isr32(void) { update(interruptArgs[32]); }
	#endif
	#ifdef CORE_INT33_PIN
	static void isr33(void) { update(interruptArgs[33]); }
	#endif
	#ifdef CORE_INT34_PIN
	static void isr34(void) { update(interruptArgs[34]); }
	#endif
	#ifdef CORE_INT35_PIN
	static void isr35(void) { update(interruptArgs[35]); }
	#endif
	#ifdef CORE_INT36_PIN
	static void isr36(void) { update(interruptArgs[36]); }
	#endif
	#ifdef CORE_INT37_PIN
	static void isr37(void) { update(interruptArgs[37]); }
	#endif
	#ifdef CORE_INT38_PIN
	static void isr38(void) { update(interruptArgs[38]); }
	#endif
	#ifdef CORE_INT39_PIN
	static void isr39(void) { update(interruptArgs[39]); }
	#endif
	#ifdef CORE_INT40_PIN
	static void isr40(void) { update(interruptArgs[40]); }
	#endif
	#ifdef CORE_INT41_PIN
	static void isr41(void) { update(interruptArgs[41]); }
	#endif
	#ifdef CORE_INT42_PIN
	static void isr42(void) { update(interruptArgs[42]); }
	#endif
	#ifdef CORE_INT43_PIN
	static void isr43(void) { update(interruptArgs[43]); }
	#endif
	#ifdef CORE_INT44_PIN
	static void isr44(void) { update(interruptArgs[44]); }
	#endif
	#ifdef CORE_INT45_PIN
	static void isr45(void) { update(interruptArgs[45]); }
	#endif
	#ifdef CORE_INT46_PIN
	static void isr46(void) { update(interruptArgs[46]); }
	#endif
	#ifdef CORE_INT47_PIN
	static void isr47(void) { update(interruptArgs[47]); }
	#endif
	#ifdef CORE_INT48_PIN
	static void isr48(void) { update(interruptArgs[48]); }
	#endif
	#ifdef CORE_INT49_PIN
	static void isr49(void) { update(interruptArgs[49]); }
	#endif
	#ifdef CORE_INT50_PIN
	static void isr50(void) { update(interruptArgs[50]); }
	#endif
	#ifdef CORE_INT51_PIN
	static void isr51(void) { update(interruptArgs[51]); }
	#endif
	#ifdef CORE_INT52_PIN
	static void isr52(void) { update(interruptArgs[52]); }
	#endif
	#ifdef CORE_INT53_PIN
	static void isr53(void) { update(interruptArgs[53]); }
	#endif
	#ifdef CORE_INT54_PIN
	static void isr54(void) { update(interruptArgs[54]); }
	#endif
	#ifdef CORE_INT55_PIN
	static void isr55(void) { update(interruptArgs[55]); }
	#endif
	#ifdef CORE_INT56_PIN
	static void isr56(void) { update(interruptArgs[56]); }
	#endif
	#ifdef CORE_INT57_PIN
	static void isr57(void) { update(interruptArgs[57]); }
	#endif
	#ifdef CORE_INT58_PIN
	static void isr58(void) { update(interruptArgs[58]); }
	#endif
	#ifdef CORE_INT59_PIN
	static void isr59(void) { update(interruptArgs[59]); }
	#endif
#endif
};

#if defined(ENCODER_USE_INTERRUPTS) && defined(ENCODER_OPTIMIZE_INTERRUPTS)
#if defined(__AVR__)
#if defined(INT0_vect) && CORE_NUM_INTERRUPT > 0
ISR(INT0_vect) { Encoder::update(Encoder::interruptArgs[SCRAMBLE_INT_ORDER(0)]); }
#endif
#if defined(INT1_vect) && CORE_NUM_INTERRUPT > 1
ISR(INT1_vect) { Encoder::update(Encoder::interruptArgs[SCRAMBLE_INT_ORDER(1)]); }
#endif
#if defined(INT2_vect) && CORE_NUM_INTERRUPT > 2
ISR(INT2_vect) { Encoder::update(Encoder::interruptArgs[SCRAMBLE_INT_ORDER(2)]); }
#endif
#if defined(INT3_vect) && CORE_NUM_INTERRUPT > 3
ISR(INT3_vect) { Encoder::update(Encoder::interruptArgs[SCRAMBLE_INT_ORDER(3)]); }
#endif
#if defined(INT4_vect) && CORE_NUM_INTERRUPT > 4
ISR(INT4_vect) { Encoder::update(Encoder::interruptArgs[SCRAMBLE_INT_ORDER(4)]); }
#endif
#if defined(INT5_vect) && CORE_NUM_INTERRUPT > 5
ISR(INT5_vect) { Encoder::update(Encoder::interruptArgs[SCRAMBLE_INT_ORDER(5)]); }
#endif
#if defined(INT6_vect) && CORE_NUM_INTERRUPT > 6
ISR(INT6_vect) { Encoder::update(Encoder::interruptArgs[SCRAMBLE_INT_ORDER(6)]); }
#endif
#if defined(INT7_vect) && CORE_NUM_INTERRUPT > 7
ISR(INT7_vect) { Encoder::update(Encoder::interruptArgs[SCRAMBLE_INT_ORDER(7)]); }
#endif
#endif // AVR
#endif // ENCODER_OPTIMIZE_INTERRUPTS


#endif