essai 1

init/init.ino

@@ -0,0 +1,6 @@
+void setup()
+{
+}
+void loop()
+{
+}

libraries/AFMotor/AFMotor.cpp

@@ -0,0 +1,563 @@
+// Adafruit Motor shield library
+// copyright Adafruit Industries LLC, 2009
+// this code is public domain, enjoy!
+
+
+#if (ARDUINO >= 100)
+ #include "Arduino.h"
+#else
+ #include <avr/io.h>
+ #include "WProgram.h"
+#endif
+
+#include "AFMotor.h"
+
+static uint8_t latch_state;
+
+#if (MICROSTEPS == 8)
+uint8_t microstepcurve[] = {0, 50, 98, 142, 180, 212, 236, 250, 255};
+#elif (MICROSTEPS == 16)
+uint8_t microstepcurve[] = {0, 25, 50, 74, 98, 120, 141, 162, 180, 197, 212, 225, 236, 244, 250, 253, 255};
+#endif
+
+AFMotorController::AFMotorController(void) {
+}
+
+void AFMotorController::enable(void) {
+  // setup the latch
+  /*
+  LATCH_DDR |= _BV(LATCH);
+  ENABLE_DDR |= _BV(ENABLE);
+  CLK_DDR |= _BV(CLK);
+  SER_DDR |= _BV(SER);
+  */
+  pinMode(MOTORLATCH, OUTPUT);
+  pinMode(MOTORENABLE, OUTPUT);
+  pinMode(MOTORDATA, OUTPUT);
+  pinMode(MOTORCLK, OUTPUT);
+
+  latch_state = 0;
+
+  latch_tx();  // "reset"
+
+  //ENABLE_PORT &= ~_BV(ENABLE); // enable the chip outputs!
+  digitalWrite(MOTORENABLE, LOW);
+}
+
+
+void AFMotorController::latch_tx(void) {
+  uint8_t i;
+
+  //LATCH_PORT &= ~_BV(LATCH);
+  digitalWrite(MOTORLATCH, LOW);
+
+  //SER_PORT &= ~_BV(SER);
+  digitalWrite(MOTORDATA, LOW);
+
+  for (i=0; i<8; i++) {
+    //CLK_PORT &= ~_BV(CLK);
+    digitalWrite(MOTORCLK, LOW);
+
+    if (latch_state & _BV(7-i)) {
+      //SER_PORT |= _BV(SER);
+      digitalWrite(MOTORDATA, HIGH);
+    } else {
+      //SER_PORT &= ~_BV(SER);
+      digitalWrite(MOTORDATA, LOW);
+    }
+    //CLK_PORT |= _BV(CLK);
+    digitalWrite(MOTORCLK, HIGH);
+  }
+  //LATCH_PORT |= _BV(LATCH);
+  digitalWrite(MOTORLATCH, HIGH);
+}
+
+static AFMotorController MC;
+
+
+/******************************************
+               MOTORS
+******************************************/
+inline void initPWM1(uint8_t freq) {
+#if defined(__AVR_ATmega8__) || \
+    defined(__AVR_ATmega48__) || \
+    defined(__AVR_ATmega88__) || \
+    defined(__AVR_ATmega168__) || \
+    defined(__AVR_ATmega328P__)
+    // use PWM from timer2A on PB3 (Arduino pin #11)
+    TCCR2A |= _BV(COM2A1) | _BV(WGM20) | _BV(WGM21); // fast PWM, turn on oc2a
+    TCCR2B = freq & 0x7;
+    OCR2A = 0;
+#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+    // on arduino mega, pin 11 is now PB5 (OC1A)
+    TCCR1A |= _BV(COM1A1) | _BV(WGM10); // fast PWM, turn on oc1a
+    TCCR1B = (freq & 0x7) | _BV(WGM12);
+    OCR1A = 0;
+#else
+   #error "This chip is not supported!"
+#endif
+    pinMode(11, OUTPUT);
+}
+
+inline void setPWM1(uint8_t s) {
+#if defined(__AVR_ATmega8__) || \
+    defined(__AVR_ATmega48__) || \
+    defined(__AVR_ATmega88__) || \
+    defined(__AVR_ATmega168__) || \
+    defined(__AVR_ATmega328P__)
+    // use PWM from timer2A on PB3 (Arduino pin #11)
+    OCR2A = s;
+#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+    // on arduino mega, pin 11 is now PB5 (OC1A)
+    OCR1A = s;
+#else
+   #error "This chip is not supported!"
+#endif
+}
+
+inline void initPWM2(uint8_t freq) {
+#if defined(__AVR_ATmega8__) || \
+    defined(__AVR_ATmega48__) || \
+    defined(__AVR_ATmega88__) || \
+    defined(__AVR_ATmega168__) || \
+    defined(__AVR_ATmega328P__)
+    // use PWM from timer2B (pin 3)
+    TCCR2A |= _BV(COM2B1) | _BV(WGM20) | _BV(WGM21); // fast PWM, turn on oc2b
+    TCCR2B = freq & 0x7;
+    OCR2B = 0;
+#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+    // on arduino mega, pin 3 is now PE5 (OC3C)
+    TCCR3A |= _BV(COM1C1) | _BV(WGM10); // fast PWM, turn on oc3c
+    TCCR3B = (freq & 0x7) | _BV(WGM12);
+    OCR3C = 0;
+#else
+   #error "This chip is not supported!"
+#endif
+
+    pinMode(3, OUTPUT);
+}
+
+inline void setPWM2(uint8_t s) {
+#if defined(__AVR_ATmega8__) || \
+    defined(__AVR_ATmega48__) || \
+    defined(__AVR_ATmega88__) || \
+    defined(__AVR_ATmega168__) || \
+    defined(__AVR_ATmega328P__)
+    // use PWM from timer2A on PB3 (Arduino pin #11)
+    OCR2B = s;
+#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+    // on arduino mega, pin 11 is now PB5 (OC1A)
+    OCR3C = s;
+#else
+   #error "This chip is not supported!"
+#endif
+}
+
+inline void initPWM3(uint8_t freq) {
+#if defined(__AVR_ATmega8__) || \
+    defined(__AVR_ATmega48__) || \
+    defined(__AVR_ATmega88__) || \
+    defined(__AVR_ATmega168__) || \
+    defined(__AVR_ATmega328P__)
+    // use PWM from timer0A / PD6 (pin 6)
+    TCCR0A |= _BV(COM0A1) | _BV(WGM00) | _BV(WGM01); // fast PWM, turn on OC0A
+    //TCCR0B = freq & 0x7;
+    OCR0A = 0;
+#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+    // on arduino mega, pin 6 is now PH3 (OC4A)
+    TCCR4A |= _BV(COM1A1) | _BV(WGM10); // fast PWM, turn on oc4a
+    TCCR4B = (freq & 0x7) | _BV(WGM12);
+    //TCCR4B = 1 | _BV(WGM12);
+    OCR4A = 0;
+#else
+   #error "This chip is not supported!"
+#endif
+    pinMode(6, OUTPUT);
+}
+
+inline void setPWM3(uint8_t s) {
+#if defined(__AVR_ATmega8__) || \
+    defined(__AVR_ATmega48__) || \
+    defined(__AVR_ATmega88__) || \
+    defined(__AVR_ATmega168__) || \
+    defined(__AVR_ATmega328P__)
+    // use PWM from timer0A on PB3 (Arduino pin #6)
+    OCR0A = s;
+#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+    // on arduino mega, pin 6 is now PH3 (OC4A)
+    OCR4A = s;
+#else
+   #error "This chip is not supported!"
+#endif
+}
+
+
+
+inline void initPWM4(uint8_t freq) {
+#if defined(__AVR_ATmega8__) || \
+    defined(__AVR_ATmega48__) || \
+    defined(__AVR_ATmega88__) || \
+    defined(__AVR_ATmega168__) || \
+    defined(__AVR_ATmega328P__)
+    // use PWM from timer0B / PD5 (pin 5)
+    TCCR0A |= _BV(COM0B1) | _BV(WGM00) | _BV(WGM01); // fast PWM, turn on oc0a
+    //TCCR0B = freq & 0x7;
+    OCR0B = 0;
+#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+    // on arduino mega, pin 5 is now PE3 (OC3A)
+    TCCR3A |= _BV(COM1A1) | _BV(WGM10); // fast PWM, turn on oc3a
+    TCCR3B = (freq & 0x7) | _BV(WGM12);
+    //TCCR4B = 1 | _BV(WGM12);
+    OCR3A = 0;
+#else
+   #error "This chip is not supported!"
+#endif
+    pinMode(5, OUTPUT);
+}
+
+inline void setPWM4(uint8_t s) {
+#if defined(__AVR_ATmega8__) || \
+    defined(__AVR_ATmega48__) || \
+    defined(__AVR_ATmega88__) || \
+    defined(__AVR_ATmega168__) || \
+    defined(__AVR_ATmega328P__)
+    // use PWM from timer0A on PB3 (Arduino pin #6)
+    OCR0B = s;
+#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+    // on arduino mega, pin 6 is now PH3 (OC4A)
+    OCR3A = s;
+#else
+   #error "This chip is not supported!"
+#endif
+}
+
+AF_DCMotor::AF_DCMotor(uint8_t num, uint8_t freq) {
+  motornum = num;
+  pwmfreq = freq;
+
+  MC.enable();
+
+  switch (num) {
+  case 1:
+    latch_state &= ~_BV(MOTOR1_A) & ~_BV(MOTOR1_B); // set both motor pins to 0
+    MC.latch_tx();
+    initPWM1(freq);
+    break;
+  case 2:
+    latch_state &= ~_BV(MOTOR2_A) & ~_BV(MOTOR2_B); // set both motor pins to 0
+    MC.latch_tx();
+    initPWM2(freq);
+    break;
+  case 3:
+    latch_state &= ~_BV(MOTOR3_A) & ~_BV(MOTOR3_B); // set both motor pins to 0
+    MC.latch_tx();
+    initPWM3(freq);
+    break;
+  case 4:
+    latch_state &= ~_BV(MOTOR4_A) & ~_BV(MOTOR4_B); // set both motor pins to 0
+    MC.latch_tx();
+    initPWM4(freq);
+    break;
+  }
+}
+
+void AF_DCMotor::run(uint8_t cmd) {
+  uint8_t a, b;
+  switch (motornum) {
+  case 1:
+    a = MOTOR1_A; b = MOTOR1_B; break;
+  case 2:
+    a = MOTOR2_A; b = MOTOR2_B; break;
+  case 3:
+    a = MOTOR3_A; b = MOTOR3_B; break;
+  case 4:
+    a = MOTOR4_A; b = MOTOR4_B; break;
+  default:
+    return;
+  }
+  
+  switch (cmd) {
+  case FORWARD:
+    latch_state |= _BV(a);
+    latch_state &= ~_BV(b); 
+    MC.latch_tx();
+    break;
+  case BACKWARD:
+    latch_state &= ~_BV(a);
+    latch_state |= _BV(b); 
+    MC.latch_tx();
+    break;
+  case RELEASE:
+    latch_state &= ~_BV(a);
+    latch_state &= ~_BV(b); 
+    MC.latch_tx();
+    break;
+  }
+}
+
+void AF_DCMotor::setSpeed(uint8_t speed) {
+  switch (motornum) {
+  case 1:
+    setPWM1(speed); break;
+  case 2:
+    setPWM2(speed); break;
+  case 3:
+    setPWM3(speed); break;
+  case 4:
+    setPWM4(speed); break;
+  }
+}
+
+/******************************************
+               STEPPERS
+******************************************/
+
+AF_Stepper::AF_Stepper(uint16_t steps, uint8_t num) {
+  MC.enable();
+
+  revsteps = steps;
+  steppernum = num;
+  currentstep = 0;
+
+  if (steppernum == 1) {
+    latch_state &= ~_BV(MOTOR1_A) & ~_BV(MOTOR1_B) &
+      ~_BV(MOTOR2_A) & ~_BV(MOTOR2_B); // all motor pins to 0
+    MC.latch_tx();
+    
+    // enable both H bridges
+    pinMode(11, OUTPUT);
+    pinMode(3, OUTPUT);
+    digitalWrite(11, HIGH);
+    digitalWrite(3, HIGH);
+
+    // use PWM for microstepping support
+    initPWM1(MOTOR12_64KHZ);
+    initPWM2(MOTOR12_64KHZ);
+    setPWM1(255);
+    setPWM2(255);
+
+  } else if (steppernum == 2) {
+    latch_state &= ~_BV(MOTOR3_A) & ~_BV(MOTOR3_B) &
+      ~_BV(MOTOR4_A) & ~_BV(MOTOR4_B); // all motor pins to 0
+    MC.latch_tx();
+
+    // enable both H bridges
+    pinMode(5, OUTPUT);
+    pinMode(6, OUTPUT);
+    digitalWrite(5, HIGH);
+    digitalWrite(6, HIGH);
+
+    // use PWM for microstepping support
+    // use PWM for microstepping support
+    initPWM3(1);
+    initPWM4(1);
+    setPWM3(255);
+    setPWM4(255);
+  }
+}
+
+void AF_Stepper::setSpeed(uint16_t rpm) {
+  usperstep = 60000000 / (revsteps * rpm);
+  steppingcounter = 0;
+}
+
+void AF_Stepper::release(void) {
+  if (steppernum == 1) {
+    latch_state &= ~_BV(MOTOR1_A) & ~_BV(MOTOR1_B) &
+      ~_BV(MOTOR2_A) & ~_BV(MOTOR2_B); // all motor pins to 0
+    MC.latch_tx();
+  } else if (steppernum == 2) {
+    latch_state &= ~_BV(MOTOR3_A) & ~_BV(MOTOR3_B) &
+      ~_BV(MOTOR4_A) & ~_BV(MOTOR4_B); // all motor pins to 0
+    MC.latch_tx();
+  }
+}
+
+void AF_Stepper::step(uint16_t steps, uint8_t dir,  uint8_t style) {
+  uint32_t uspers = usperstep;
+  uint8_t ret = 0;
+
+  if (style == INTERLEAVE) {
+    uspers /= 2;
+  }
+ else if (style == MICROSTEP) {
+    uspers /= MICROSTEPS;
+    steps *= MICROSTEPS;
+#ifdef MOTORDEBUG
+    Serial.print("steps = "); Serial.println(steps, DEC);
+#endif
+  }
+
+  while (steps--) {
+    ret = onestep(dir, style);
+    delay(uspers/1000); // in ms
+    steppingcounter += (uspers % 1000);
+    if (steppingcounter >= 1000) {
+      delay(1);
+      steppingcounter -= 1000;
+    }
+  }
+  if (style == MICROSTEP) {
+    while ((ret != 0) && (ret != MICROSTEPS)) {
+      ret = onestep(dir, style);
+      delay(uspers/1000); // in ms
+      steppingcounter += (uspers % 1000);
+      if (steppingcounter >= 1000) {
+	delay(1);
+	steppingcounter -= 1000;
+      } 
+    }
+  }
+}
+
+uint8_t AF_Stepper::onestep(uint8_t dir, uint8_t style) {
+  uint8_t a, b, c, d;
+  uint8_t ocrb, ocra;
+
+  ocra = ocrb = 255;
+
+  if (steppernum == 1) {
+    a = _BV(MOTOR1_A);
+    b = _BV(MOTOR2_A);
+    c = _BV(MOTOR1_B);
+    d = _BV(MOTOR2_B);
+  } else if (steppernum == 2) {
+    a = _BV(MOTOR3_A);
+    b = _BV(MOTOR4_A);
+    c = _BV(MOTOR3_B);
+    d = _BV(MOTOR4_B);
+  } else {
+    return 0;
+  }
+
+  // next determine what sort of stepping procedure we're up to
+  if (style == SINGLE) {
+    if ((currentstep/(MICROSTEPS/2)) % 2) { // we're at an odd step, weird
+      if (dir == FORWARD) {
+	currentstep += MICROSTEPS/2;
+      }
+      else {
+	currentstep -= MICROSTEPS/2;
+      }
+    } else {           // go to the next even step
+      if (dir == FORWARD) {
+	currentstep += MICROSTEPS;
+      }
+      else {
+	currentstep -= MICROSTEPS;
+      }
+    }
+  } else if (style == DOUBLE) {
+    if (! (currentstep/(MICROSTEPS/2) % 2)) { // we're at an even step, weird
+      if (dir == FORWARD) {
+	currentstep += MICROSTEPS/2;
+      } else {
+	currentstep -= MICROSTEPS/2;
+      }
+    } else {           // go to the next odd step
+      if (dir == FORWARD) {
+	currentstep += MICROSTEPS;
+      } else {
+	currentstep -= MICROSTEPS;
+      }
+    }
+  } else if (style == INTERLEAVE) {
+    if (dir == FORWARD) {
+       currentstep += MICROSTEPS/2;
+    } else {
+       currentstep -= MICROSTEPS/2;
+    }
+  } 
+
+  if (style == MICROSTEP) {
+    if (dir == FORWARD) {
+      currentstep++;
+    } else {
+      // BACKWARDS
+      currentstep--;
+    }
+
+    currentstep += MICROSTEPS*4;
+    currentstep %= MICROSTEPS*4;
+
+    ocra = ocrb = 0;
+    if ( (currentstep >= 0) && (currentstep < MICROSTEPS)) {
+      ocra = microstepcurve[MICROSTEPS - currentstep];
+      ocrb = microstepcurve[currentstep];
+    } else if  ( (currentstep >= MICROSTEPS) && (currentstep < MICROSTEPS*2)) {
+      ocra = microstepcurve[currentstep - MICROSTEPS];
+      ocrb = microstepcurve[MICROSTEPS*2 - currentstep];
+    } else if  ( (currentstep >= MICROSTEPS*2) && (currentstep < MICROSTEPS*3)) {
+      ocra = microstepcurve[MICROSTEPS*3 - currentstep];
+      ocrb = microstepcurve[currentstep - MICROSTEPS*2];
+    } else if  ( (currentstep >= MICROSTEPS*3) && (currentstep < MICROSTEPS*4)) {
+      ocra = microstepcurve[currentstep - MICROSTEPS*3];
+      ocrb = microstepcurve[MICROSTEPS*4 - currentstep];
+    }
+  }
+
+  currentstep += MICROSTEPS*4;
+  currentstep %= MICROSTEPS*4;
+
+#ifdef MOTORDEBUG
+  Serial.print("current step: "); Serial.println(currentstep, DEC);
+  Serial.print(" pwmA = "); Serial.print(ocra, DEC); 
+  Serial.print(" pwmB = "); Serial.println(ocrb, DEC); 
+#endif
+
+  if (steppernum == 1) {
+    setPWM1(ocra);
+    setPWM2(ocrb);
+  } else if (steppernum == 2) {
+    setPWM3(ocra);
+    setPWM4(ocrb);
+  }
+
+
+  // release all
+  latch_state &= ~a & ~b & ~c & ~d; // all motor pins to 0
+
+  //Serial.println(step, DEC);
+  if (style == MICROSTEP) {
+    if ((currentstep >= 0) && (currentstep < MICROSTEPS))
+      latch_state |= a | b;
+    if ((currentstep >= MICROSTEPS) && (currentstep < MICROSTEPS*2))
+      latch_state |= b | c;
+    if ((currentstep >= MICROSTEPS*2) && (currentstep < MICROSTEPS*3))
+      latch_state |= c | d;
+    if ((currentstep >= MICROSTEPS*3) && (currentstep < MICROSTEPS*4))
+      latch_state |= d | a;
+  } else {
+    switch (currentstep/(MICROSTEPS/2)) {
+    case 0:
+      latch_state |= a; // energize coil 1 only
+      break;
+    case 1:
+      latch_state |= a | b; // energize coil 1+2
+      break;
+    case 2:
+      latch_state |= b; // energize coil 2 only
+      break;
+    case 3:
+      latch_state |= b | c; // energize coil 2+3
+      break;
+    case 4:
+      latch_state |= c; // energize coil 3 only
+      break; 
+    case 5:
+      latch_state |= c | d; // energize coil 3+4
+      break;
+    case 6:
+      latch_state |= d; // energize coil 4 only
+      break;
+    case 7:
+      latch_state |= d | a; // energize coil 1+4
+      break;
+    }
+  }
+
+ 
+  MC.latch_tx();
+  return currentstep;
+}
+

libraries/AFMotor/AFMotor.h

@@ -0,0 +1,104 @@
+// Adafruit Motor shield library
+// copyright Adafruit Industries LLC, 2009
+// this code is public domain, enjoy!
+
+#ifndef _AFMotor_h_
+#define _AFMotor_h_
+
+#include <inttypes.h>
+#include <avr/io.h>
+
+//#define MOTORDEBUG 1
+
+#define MICROSTEPS 16         // 8 or 16
+
+#define MOTOR12_64KHZ _BV(CS20)  // no prescale
+#define MOTOR12_8KHZ _BV(CS21)   // divide by 8
+#define MOTOR12_2KHZ _BV(CS21) | _BV(CS20) // divide by 32
+#define MOTOR12_1KHZ _BV(CS22)  // divide by 64
+
+#define MOTOR34_64KHZ _BV(CS00)  // no prescale
+#define MOTOR34_8KHZ _BV(CS01)   // divide by 8
+#define MOTOR34_1KHZ _BV(CS01) | _BV(CS00)  // divide by 64
+
+#define MOTOR1_A 2
+#define MOTOR1_B 3
+#define MOTOR2_A 1
+#define MOTOR2_B 4
+#define MOTOR4_A 0
+#define MOTOR4_B 6
+#define MOTOR3_A 5
+#define MOTOR3_B 7
+
+#define FORWARD 1
+#define BACKWARD 2
+#define BRAKE 3
+#define RELEASE 4
+
+#define SINGLE 1
+#define DOUBLE 2
+#define INTERLEAVE 3
+#define MICROSTEP 4
+
+/*
+#define LATCH 4
+#define LATCH_DDR DDRB
+#define LATCH_PORT PORTB
+
+#define CLK_PORT PORTD
+#define CLK_DDR DDRD
+#define CLK 4
+
+#define ENABLE_PORT PORTD
+#define ENABLE_DDR DDRD
+#define ENABLE 7
+
+#define SER 0
+#define SER_DDR DDRB
+#define SER_PORT PORTB
+*/
+
+// Arduino pin names
+#define MOTORLATCH 12
+#define MOTORCLK 4
+#define MOTORENABLE 7
+#define MOTORDATA 8
+
+class AFMotorController
+{
+  public:
+    AFMotorController(void);
+    void enable(void);
+    friend class AF_DCMotor;
+    void latch_tx(void);
+};
+
+class AF_DCMotor
+{
+ public:
+  AF_DCMotor(uint8_t motornum, uint8_t freq =  MOTOR34_8KHZ);
+  void run(uint8_t);
+  void setSpeed(uint8_t);
+
+ private:
+  uint8_t motornum, pwmfreq;
+};
+
+class AF_Stepper {
+ public:
+  AF_Stepper(uint16_t, uint8_t);
+  void step(uint16_t steps, uint8_t dir,  uint8_t style = SINGLE);
+  void setSpeed(uint16_t);
+  uint8_t onestep(uint8_t dir, uint8_t style);
+  void release(void);
+  uint16_t revsteps; // # steps per revolution
+  uint8_t steppernum;
+  uint32_t usperstep, steppingcounter;
+ private:
+  uint8_t currentstep;
+
+};
+
+uint8_t getlatchstate(void);
+
+#endif

libraries/AFMotor/README.txt

@@ -0,0 +1,5 @@
+This is the August 12, 2009 Adafruit Motor shield firmware with basic Microstepping support. Works with all Arduinos and the Mega
+
+For more information on the shield, please visit http://www.ladyada.net/make/mshield/
+
+To install, click DOWNLOAD SOURCE in the top right corner, and see our tutorial at http://www.ladyada.net/library/arduino/libraries.html on Arduino Library installation

libraries/AFMotor/examples/MotorParty/MotorParty.pde

@@ -0,0 +1,60 @@
+// Adafruit Motor shield library
+// copyright Adafruit Industries LLC, 2009
+// this code is public domain, enjoy!
+
+#include <AFMotor.h>
+#include <ServoTimer1.h>
+
+// DC motor on M2
+AF_DCMotor motor(2);
+// DC hobby servo
+ServoTimer1 servo1;
+// Stepper motor on M3+M4 48 steps per revolution
+AF_Stepper stepper(48, 2);
+
+void setup() {
+  Serial.begin(9600);           // set up Serial library at 9600 bps
+  Serial.println("Motor party!");
+  
+  // turn on servo
+  servo1.attach(9);
+   
+  // turn on motor #2
+  motor.setSpeed(200);
+  motor.run(RELEASE);
+}
+
+int i;
+
+// Test the DC motor, stepper and servo ALL AT ONCE!
+void loop() {
+  motor.run(FORWARD);
+  for (i=0; i<255; i++) {
+    servo1.write(i);
+    motor.setSpeed(i);  
+    stepper.step(1, FORWARD, INTERLEAVE);
+    delay(3);
+ }
+ 
+  for (i=255; i!=0; i--) {
+    servo1.write(i-255);
+    motor.setSpeed(i);  
+    stepper.step(1, BACKWARD, INTERLEAVE);
+    delay(3);
+ }
+ 
+  motor.run(BACKWARD);
+  for (i=0; i<255; i++) {
+    servo1.write(i);
+    motor.setSpeed(i);  
+    delay(3);
+    stepper.step(1, FORWARD, DOUBLE);
+ }
+ 
+  for (i=255; i!=0; i--) {
+    servo1.write(i-255);
+    motor.setSpeed(i);  
+    stepper.step(1, BACKWARD, DOUBLE);
+    delay(3);
+ }
+}

libraries/AFMotor/examples/MotorTest/MotorTest.pde

@@ -0,0 +1,52 @@
+// Adafruit Motor shield library
+// copyright Adafruit Industries LLC, 2009
+// this code is public domain, enjoy!
+
+#include <AFMotor.h>
+
+AF_DCMotor motor(4);
+
+void setup() {
+  Serial.begin(9600);           // set up Serial library at 9600 bps
+  Serial.println("Motor test!");
+
+  // turn on motor
+  motor.setSpeed(200);
+ 
+  motor.run(RELEASE);
+}
+
+void loop() {
+  uint8_t i;
+  
+  Serial.print("tick");
+  
+  motor.run(FORWARD);
+  for (i=0; i<255; i++) {
+    motor.setSpeed(i);  
+    delay(10);
+ }
+ 
+  for (i=255; i!=0; i--) {
+    motor.setSpeed(i);  
+    delay(10);
+ }
+  
+  Serial.print("tock");
+
+  motor.run(BACKWARD);
+  for (i=0; i<255; i++) {
+    motor.setSpeed(i);  
+    delay(10);
+ }
+ 
+  for (i=255; i!=0; i--) {
+    motor.setSpeed(i);  
+    delay(10);
+ }
+  
+
+  Serial.print("tech");
+  motor.run(RELEASE);
+  delay(1000);
+}

libraries/AFMotor/examples/StepperTest/StepperTest.pde

@@ -0,0 +1,34 @@
+// Adafruit Motor shield library
+// copyright Adafruit Industries LLC, 2009
+// this code is public domain, enjoy!
+
+#include <AFMotor.h>
+
+// Connect a stepper motor with 48 steps per revolution (7.5 degree)
+// to motor port #2 (M3 and M4)
+AF_Stepper motor(48, 2);
+
+void setup() {
+  Serial.begin(9600);           // set up Serial library at 9600 bps
+  Serial.println("Stepper test!");
+
+  motor.setSpeed(10);  // 10 rpm   
+}
+
+void loop() {
+  Serial.println("Single coil steps");
+  motor.step(100, FORWARD, SINGLE); 
+  motor.step(100, BACKWARD, SINGLE); 
+
+  Serial.println("Double coil steps");
+  motor.step(100, FORWARD, DOUBLE); 
+  motor.step(100, BACKWARD, DOUBLE);
+
+  Serial.println("Interleave coil steps");
+  motor.step(100, FORWARD, INTERLEAVE); 
+  motor.step(100, BACKWARD, INTERLEAVE); 
+
+  Serial.println("Micrsostep steps");
+  motor.step(100, FORWARD, MICROSTEP); 
+  motor.step(100, BACKWARD, MICROSTEP); 
+}

libraries/AFMotor/keywords.txt

@@ -0,0 +1,35 @@
+#######################################
+# Syntax Coloring Map for AFMotor
+#######################################
+
+#######################################
+# Datatypes (KEYWORD1)
+#######################################
+
+AF_DCMotor	KEYWORD1
+AF_Stepper	KEYWORD1
+
+#######################################
+# Methods and Functions (KEYWORD2)
+#######################################
+
+enable	KEYWORD2
+run	KEYWORD2
+setSpeed	KEYWORD2
+step	KEYWORD2
+onestep	KEYWORD2
+release	KEYWORD2
+
+#######################################
+# Constants (LITERAL1)
+#######################################
+
+MICROSTEPPING	LITERAL1
+FORWARD	LITERAL1
+BACKWARD	LITERAL1
+BRAKE	LITERAL1
+RELEASE	LITERAL1
+SINGLE	LITERAL1
+DOUBLE	LITERAL1
+INTERLEAVE	LITERAL1
+MICROSTEP	LITERAL1

libraries/AccelStepper/AccelStepper.cpp

@@ -0,0 +1,624 @@
+// AccelStepper.cpp
+//
+// Copyright (C) 2009-2013 Mike McCauley
+// $Id: AccelStepper.cpp,v 1.17 2013/08/02 01:53:21 mikem Exp mikem $
+
+#include "AccelStepper.h"
+
+#if 0
+// Some debugging assistance
+void dump(uint8_t* p, int l)
+{
+    int i;
+
+    for (i = 0; i < l; i++)
+    {
+	Serial.print(p[i], HEX);
+	Serial.print(" ");
+    }
+    Serial.println("");
+}
+#endif
+
+void AccelStepper::moveTo(long absolute)
+{
+    if (_targetPos != absolute)
+    {
+	_targetPos = absolute;
+	computeNewSpeed();
+	// compute new n?
+    }
+}
+
+void AccelStepper::move(long relative)
+{
+    moveTo(_currentPos + relative);
+}
+
+// Implements steps according to the current step interval
+// You must call this at least once per step
+// returns true if a step occurred
+boolean AccelStepper::runSpeed()
+{
+    // Dont do anything unless we actually have a step interval
+    if (!_stepInterval)
+	return false;
+
+    unsigned long time = micros();
+    // Gymnastics to detect wrapping of either the nextStepTime and/or the current time
+    unsigned long nextStepTime = _lastStepTime + _stepInterval;
+    if (   ((nextStepTime >= _lastStepTime) && ((time >= nextStepTime) || (time < _lastStepTime)))
+	|| ((nextStepTime < _lastStepTime) && ((time >= nextStepTime) && (time < _lastStepTime))))
+
+    {
+	if (_direction == DIRECTION_CW)
+	{
+	    // Clockwise
+	    _currentPos += 1;
+	}
+	else
+	{
+	    // Anticlockwise  
+	    _currentPos -= 1;
+	}
+	step(_currentPos);
+
+	_lastStepTime = time;
+	return true;
+    }
+    else
+    {
+	return false;
+    }
+}
+
+long AccelStepper::distanceToGo()
+{
+    return _targetPos - _currentPos;
+}
+
+long AccelStepper::targetPosition()
+{
+    return _targetPos;
+}
+
+long AccelStepper::currentPosition()
+{
+    return _currentPos;
+}
+
+// Useful during initialisations or after initial positioning
+// Sets speed to 0
+void AccelStepper::setCurrentPosition(long position)
+{
+    _targetPos = _currentPos = position;
+    _n = 0;
+    _stepInterval = 0;
+}
+
+void AccelStepper::computeNewSpeed()
+{
+    long distanceTo = distanceToGo(); // +ve is clockwise from curent location
+
+    long stepsToStop = (long)((_speed * _speed) / (2.0 * _acceleration)); // Equation 16
+
+    if (distanceTo == 0 && stepsToStop <= 1)
+    {
+	// We are at the target and its time to stop
+	_stepInterval = 0;
+	_speed = 0.0;
+	_n = 0;
+	return;
+    }
+
+    if (distanceTo > 0)
+    {
+	// We are anticlockwise from the target
+	// Need to go clockwise from here, maybe decelerate now
+	if (_n > 0)
+	{
+	    // Currently accelerating, need to decel now? Or maybe going the wrong way?
+	    if ((stepsToStop >= distanceTo) || _direction == DIRECTION_CCW)
+		_n = -stepsToStop; // Start deceleration
+	}
+	else if (_n < 0)
+	{
+	    // Currently decelerating, need to accel again?
+	    if ((stepsToStop < distanceTo) && _direction == DIRECTION_CW)
+		_n = -_n; // Start accceleration
+	}
+    }
+    else if (distanceTo < 0)
+    {
+	// We are clockwise from the target
+	// Need to go anticlockwise from here, maybe decelerate
+	if (_n > 0)
+	{
+	    // Currently accelerating, need to decel now? Or maybe going the wrong way?
+	    if ((stepsToStop >= -distanceTo) || _direction == DIRECTION_CW)
+		_n = -stepsToStop; // Start deceleration
+	}
+	else if (_n < 0)
+	{
+	    // Currently decelerating, need to accel again?
+	    if ((stepsToStop < -distanceTo) && _direction == DIRECTION_CCW)
+		_n = -_n; // Start accceleration
+	}
+    }
+
+    // Need to accelerate or decelerate
+    if (_n == 0)
+    {
+	// First step from stopped
+	_cn = _c0;
+	_direction = (distanceTo > 0) ? DIRECTION_CW : DIRECTION_CCW;
+    }
+    else
+    {
+	// Subsequent step. Works for accel (n is +_ve) and decel (n is -ve).
+	_cn = _cn - ((2.0 * _cn) / ((4.0 * _n) + 1)); // Equation 13
+	_cn = max(_cn, _cmin); 
+    }
+    _n++;
+    _stepInterval = _cn;
+    _speed = 1000000.0 / _cn;
+    if (_direction == DIRECTION_CCW)
+	_speed = -_speed;
+
+#if 0
+    Serial.println(_speed);
+    Serial.println(_acceleration);
+    Serial.println(_cn);
+    Serial.println(_c0);
+    Serial.println(_n);
+    Serial.println(_stepInterval);
+    Serial.println(distanceTo);
+    Serial.println(stepsToStop);
+    Serial.println("-----");
+#endif
+}
+
+// Run the motor to implement speed and acceleration in order to proceed to the target position
+// You must call this at least once per step, preferably in your main loop
+// If the motor is in the desired position, the cost is very small
+// returns true if the motor is still running to the target position.
+boolean AccelStepper::run()
+{
+    if (runSpeed())
+		computeNewSpeed();
+    return _speed != 0.0 || distanceToGo() != 0;
+}
+
+AccelStepper::AccelStepper(uint8_t interface, uint8_t pin1, uint8_t pin2, uint8_t pin3, uint8_t pin4, bool enable)
+{
+    _interface = interface;
+    _currentPos = 0;
+    _targetPos = 0;
+    _speed = 0.0;
+    _maxSpeed = 1.0;
+    _acceleration = 1.0;
+    _sqrt_twoa = 1.0;
+    _stepInterval = 0;
+    _minPulseWidth = 1;
+    _enablePin = 0xff;
+    _lastStepTime = 0;
+    _pin[0] = pin1;
+    _pin[1] = pin2;
+    _pin[2] = pin3;
+    _pin[3] = pin4;
+
+    // NEW
+    _n = 0;
+    _c0 = 0.0;
+    _cn = 0.0;
+    _cmin = 1.0;
+    _direction = DIRECTION_CCW;
+
+    int i;
+    for (i = 0; i < 4; i++)
+	_pinInverted[i] = 0;
+    if (enable)
+	enableOutputs();
+}
+
+AccelStepper::AccelStepper(void (*forward)(), void (*backward)())
+{
+    _interface = 0;
+    _currentPos = 0;
+    _targetPos = 0;
+    _speed = 0.0;
+    _maxSpeed = 1.0;
+    _acceleration = 1.0;
+    _sqrt_twoa = 1.0;
+    _stepInterval = 0;
+    _minPulseWidth = 1;
+    _enablePin = 0xff;
+    _lastStepTime = 0;
+    _pin[0] = 0;
+    _pin[1] = 0;
+    _pin[2] = 0;
+    _pin[3] = 0;
+    _forward = forward;
+    _backward = backward;
+
+    // NEW
+    _n = 0;
+    _c0 = 0.0;
+    _cn = 0.0;
+    _cmin = 1.0;
+    _direction = DIRECTION_CCW;
+
+    int i;
+    for (i = 0; i < 4; i++)
+	_pinInverted[i] = 0;
+}
+
+void AccelStepper::setMaxSpeed(float speed)
+{
+    if (_maxSpeed != speed)
+    {
+	_maxSpeed = speed;
+	_cmin = 1000000.0 / speed;
+	// Recompute _n from current speed and adjust speed if accelerating or cruising
+	if (_n > 0)
+	{
+	    _n = (long)((_speed * _speed) / (2.0 * _acceleration)); // Equation 16
+	    computeNewSpeed();
+	}
+    }
+}
+
+void AccelStepper::setAcceleration(float acceleration)
+{
+    if (acceleration == 0.0)
+	return;
+    if (_acceleration != acceleration)
+    {
+	// Recompute _n per Equation 17
+	_n = _n * (_acceleration / acceleration);
+	// New c0 per Equation 7
+	_c0 = sqrt(2.0 / acceleration) * 1000000.0;
+	_acceleration = acceleration;
+	computeNewSpeed();
+    }
+}
+
+void AccelStepper::setSpeed(float speed)
+{
+    if (speed == _speed)
+        return;
+    speed = constrain(speed, -_maxSpeed, _maxSpeed);
+    if (speed == 0.0)
+	_stepInterval = 0;
+    else
+    {
+	_stepInterval = fabs(1000000.0 / speed);
+	_direction = (speed > 0.0) ? DIRECTION_CW : DIRECTION_CCW;
+    }
+    _speed = speed;
+}
+
+float AccelStepper::speed()
+{
+    return _speed;
+}
+
+// Subclasses can override
+void AccelStepper::step(long step)
+{
+    switch (_interface)
+    {
+        case FUNCTION:
+            step0(step);
+            break;
+
+	case DRIVER:
+	    step1(step);
+	    break;
+    
+	case FULL2WIRE:
+	    step2(step);
+	    break;
+    
+	case FULL3WIRE:
+	    step3(step);
+	    break;  
+
+	case FULL4WIRE:
+	    step4(step);
+	    break;  
+
+	case HALF3WIRE:
+	    step6(step);
+	    break;  
+		
+	case HALF4WIRE:
+	    step8(step);
+	    break;  
+    }
+}
+
+// You might want to override this to implement eg serial output
+// bit 0 of the mask corresponds to _pin[0]
+// bit 1 of the mask corresponds to _pin[1]
+// ....
+void AccelStepper::setOutputPins(uint8_t mask)
+{
+    uint8_t numpins = 2;
+    if (_interface == FULL4WIRE || _interface == HALF4WIRE)
+	numpins = 4;
+    uint8_t i;
+    for (i = 0; i < numpins; i++)
+	digitalWrite(_pin[i], (mask & (1 << i)) ? (HIGH ^ _pinInverted[i]) : (LOW ^ _pinInverted[i]));
+}
+
+// 0 pin step function (ie for functional usage)
+void AccelStepper::step0(long step)
+{
+  if (_speed > 0)
+    _forward();
+  else
+    _backward();
+}
+
+// 1 pin step function (ie for stepper drivers)
+// This is passed the current step number (0 to 7)
+// Subclasses can override
+void AccelStepper::step1(long step)
+{
+    // _pin[0] is step, _pin[1] is direction
+    setOutputPins(_direction ? 0b10 : 0b00); // Set direction first else get rogue pulses
+    setOutputPins(_direction ? 0b11 : 0b01); // step HIGH
+    // Caution 200ns setup time 
+    // Delay the minimum allowed pulse width
+    delayMicroseconds(_minPulseWidth);
+    setOutputPins(_direction ? 0b10 : 0b00); // step LOW
+
+}
+
+
+// 2 pin step function
+// This is passed the current step number (0 to 7)
+// Subclasses can override
+void AccelStepper::step2(long step)
+{
+    switch (step & 0x3)
+    {
+	case 0: /* 01 */
+	    setOutputPins(0b10);
+	    break;
+
+	case 1: /* 11 */
+	    setOutputPins(0b11);
+	    break;
+
+	case 2: /* 10 */
+	    setOutputPins(0b01);
+	    break;
+
+	case 3: /* 00 */
+	    setOutputPins(0b00);
+	    break;
+    }
+}
+// 3 pin step function
+// This is passed the current step number (0 to 7)
+// Subclasses can override
+void AccelStepper::step3(long step)
+{
+    switch (step % 3)
+    {
+	case 0:    // 100
+	    setOutputPins(0b100);
+	    break;
+
+	case 1:    // 001
+	    setOutputPins(0b001);
+	    break;
+
+	case 2:    //010
+	    setOutputPins(0b010);
+	    break;
+	    
+    }
+}
+
+// 4 pin step function for half stepper
+// This is passed the current step number (0 to 7)
+// Subclasses can override
+void AccelStepper::step4(long step)
+{
+    switch (step & 0x3)
+    {
+	case 0:    // 1010
+	    setOutputPins(0b0101);
+	    break;
+
+	case 1:    // 0110
+	    setOutputPins(0b0110);
+	    break;
+
+	case 2:    //0101
+	    setOutputPins(0b1010);
+	    break;
+
+	case 3:    //1001
+	    setOutputPins(0b1001);
+	    break;
+    }
+}
+
+// 3 pin half step function
+// This is passed the current step number (0 to 7)
+// Subclasses can override
+void AccelStepper::step6(long step)
+{
+    switch (step % 6)
+    {
+	case 0:    // 100
+	    setOutputPins(0b100);
+            break;
+	    
+        case 1:    // 101
+	    setOutputPins(0b101);
+            break;
+	    
+	case 2:    // 001
+	    setOutputPins(0b001);
+            break;
+	    
+        case 3:    // 011
+	    setOutputPins(0b011);
+            break;
+	    
+	case 4:    // 010
+	    setOutputPins(0b010);
+            break;
+	    
+	case 5:    // 011
+	    setOutputPins(0b110);
+            break;
+	    
+    }
+}
+
+// 4 pin half step function
+// This is passed the current step number (0 to 7)
+// Subclasses can override
+void AccelStepper::step8(long step)
+{
+    switch (step & 0x7)
+    {
+	case 0:    // 1000
+	    setOutputPins(0b0001);
+            break;
+	    
+        case 1:    // 1010
+	    setOutputPins(0b0101);
+            break;
+	    
+	case 2:    // 0010
+	    setOutputPins(0b0100);
+            break;
+	    
+        case 3:    // 0110
+	    setOutputPins(0b0110);
+            break;
+	    
+	case 4:    // 0100
+	    setOutputPins(0b0010);
+            break;
+	    
+        case 5:    //0101
+	    setOutputPins(0b1010);
+            break;
+	    
+	case 6:    // 0001
+	    setOutputPins(0b1000);
+            break;
+	    
+        case 7:    //1001
+	    setOutputPins(0b1001);
+            break;
+    }
+}
+    
+// Prevents power consumption on the outputs
+void    AccelStepper::disableOutputs()
+{   
+    if (! _interface) return;
+
+    setOutputPins(0); // Handles inversion automatically
+    if (_enablePin != 0xff)
+        digitalWrite(_enablePin, LOW ^ _enableInverted);
+}
+
+void    AccelStepper::enableOutputs()
+{
+    if (! _interface) 
+	return;
+
+    pinMode(_pin[0], OUTPUT);
+    pinMode(_pin[1], OUTPUT);
+    if (_interface == FULL4WIRE || _interface == HALF4WIRE)
+    {
+        pinMode(_pin[2], OUTPUT);
+        pinMode(_pin[3], OUTPUT);
+    }
+
+    if (_enablePin != 0xff)
+    {
+        pinMode(_enablePin, OUTPUT);
+        digitalWrite(_enablePin, HIGH ^ _enableInverted);
+    }
+}
+
+void AccelStepper::setMinPulseWidth(unsigned int minWidth)
+{
+    _minPulseWidth = minWidth;
+}
+
+void AccelStepper::setEnablePin(uint8_t enablePin)
+{
+    _enablePin = enablePin;
+
+    // This happens after construction, so init pin now.
+    if (_enablePin != 0xff)
+    {
+        pinMode(_enablePin, OUTPUT);
+        digitalWrite(_enablePin, HIGH ^ _enableInverted);
+    }
+}
+
+void AccelStepper::setPinsInverted(bool directionInvert, bool stepInvert, bool enableInvert)
+{
+    _pinInverted[0] = stepInvert;
+    _pinInverted[1] = directionInvert;
+    _enableInverted = enableInvert;
+}
+
+void AccelStepper::setPinsInverted(bool pin1Invert, bool pin2Invert, bool pin3Invert, bool pin4Invert, bool enableInvert)
+{    
+    _pinInverted[0] = pin1Invert;
+    _pinInverted[1] = pin2Invert;
+    _pinInverted[2] = pin3Invert;
+    _pinInverted[3] = pin4Invert;
+    _enableInverted = enableInvert;
+}
+
+// Blocks until the target position is reached and stopped
+void AccelStepper::runToPosition()
+{
+    while (run())
+	;
+}
+
+boolean AccelStepper::runSpeedToPosition()
+{
+    if (_targetPos == _currentPos)
+	return false;
+    if (_targetPos >_currentPos)
+	_direction = DIRECTION_CW;
+    else
+	_direction = DIRECTION_CCW;
+    return runSpeed();
+}
+
+// Blocks until the new target position is reached
+void AccelStepper::runToNewPosition(long position)
+{
+    moveTo(position);
+    runToPosition();
+}
+
+void AccelStepper::stop()
+{
+    if (_speed != 0.0)
+    {    
+	long stepsToStop = (long)((_speed * _speed) / (2.0 * _acceleration)) + 1; // Equation 16 (+integer rounding)
+	if (_speed > 0)
+	    move(stepsToStop);
+	else
+	    move(-stepsToStop);
+    }
+}

libraries/AccelStepper/AccelStepper.h

@@ -0,0 +1,620 @@
+// AccelStepper.h
+//
+/// \mainpage AccelStepper library for Arduino
+///
+/// This is the Arduino AccelStepper library.
+/// It provides an object-oriented interface for 2, 3 or 4 pin stepper motors.
+///
+/// The standard Arduino IDE includes the Stepper library
+/// (http://arduino.cc/en/Reference/Stepper) for stepper motors. It is
+/// perfectly adequate for simple, single motor applications.
+///
+/// AccelStepper significantly improves on the standard Arduino Stepper library in several ways:
+/// \li Supports acceleration and deceleration
+/// \li Supports multiple simultaneous steppers, with independent concurrent stepping on each stepper
+/// \li API functions never delay() or block
+/// \li Supports 2, 3 and 4 wire steppers, plus 3 and 4 wire half steppers.
+/// \li Supports alternate stepping functions to enable support of AFMotor (https://github.com/adafruit/Adafruit-Motor-Shield-library)
+/// \li Supports stepper drivers such as the Sparkfun EasyDriver (based on 3967 driver chip)
+/// \li Very slow speeds are supported
+/// \li Extensive API
+/// \li Subclass support
+///
+/// The latest version of this documentation can be downloaded from 
+/// http://www.airspayce.com/mikem/arduino/AccelStepper
+/// The version of the package that this documentation refers to can be downloaded 
+/// from http://www.airspayce.com/mikem/arduino/AccelStepper/AccelStepper-1.38.zip
+///
+/// Example Arduino programs are included to show the main modes of use.
+///
+/// You can also find online help and discussion at http://groups.google.com/group/accelstepper
+/// Please use that group for all questions and discussions on this topic. 
+/// Do not contact the author directly, unless it is to discuss commercial licensing.
+///
+/// Tested on Arduino Diecimila and Mega with arduino-0018 & arduino-0021 
+/// on OpenSuSE 11.1 and avr-libc-1.6.1-1.15,
+/// cross-avr-binutils-2.19-9.1, cross-avr-gcc-4.1.3_20080612-26.5.
+///
+/// \par Installation
+/// Install in the usual way: unzip the distribution zip file to the libraries
+/// sub-folder of your sketchbook. 
+///
+/// \par Theory
+/// This code uses speed calculations as described in 
+/// "Generate stepper-motor speed profiles in real time" by David Austin 
+/// http://fab.cba.mit.edu/classes/MIT/961.09/projects/i0/Stepper_Motor_Speed_Profile.pdf
+/// with the exception that AccelStepper uses steps per second rather than radians per second
+/// (because we dont know the step angle of the motor)
+/// An initial step interval is calculated for the first step, based on the desired acceleration
+/// On subsequent steps, shorter step intervals are calculated based 
+/// on the previous step until max speed is achieved.
+/// 
+/// This software is Copyright (C) 2010 Mike McCauley. Use is subject to license
+/// conditions. The main licensing options available are GPL V2 or Commercial:
+///
+/// \par Open Source Licensing GPL V2
+/// This is the appropriate option if you want to share the source code of your
+/// application with everyone you distribute it to, and you also want to give them
+/// the right to share who uses it. If you wish to use this software under Open
+/// Source Licensing, you must contribute all your source code to the open source
+/// community in accordance with the GPL Version 2 when your application is
+/// distributed. See http://www.gnu.org/copyleft/gpl.html
+/// 
+/// \par Commercial Licensing
+/// This is the appropriate option if you are creating proprietary applications
+/// and you are not prepared to distribute and share the source code of your
+/// application. Contact info@airspayce.com for details.
+///
+/// \par Revision History
+/// \version 1.0 Initial release
+///
+/// \version 1.1 Added speed() function to get the current speed.
+/// \version 1.2 Added runSpeedToPosition() submitted by Gunnar Arndt.
+/// \version 1.3 Added support for stepper drivers (ie with Step and Direction inputs) with _pins == 1
+/// \version 1.4 Added functional contructor to support AFMotor, contributed by Limor, with example sketches.
+/// \version 1.5 Improvements contributed by Peter Mousley: Use of microsecond steps and other speed improvements
+///              to increase max stepping speed to about 4kHz. New option for user to set the min allowed pulse width.
+///              Added checks for already running at max speed and skip further calcs if so. 
+/// \version 1.6 Fixed a problem with wrapping of microsecond stepping that could cause stepping to hang. 
+///              Reported by Sandy Noble.
+///              Removed redundant _lastRunTime member.
+/// \version 1.7 Fixed a bug where setCurrentPosition() did not always work as expected. 
+///              Reported by Peter Linhart.
+/// \version 1.8 Added support for 4 pin half-steppers, requested by Harvey Moon
+/// \version 1.9 setCurrentPosition() now also sets motor speed to 0.
+/// \version 1.10 Builds on Arduino 1.0
+/// \version 1.11 Improvments from Michael Ellison:
+///   Added optional enable line support for stepper drivers
+///   Added inversion for step/direction/enable lines for stepper drivers
+/// \version 1.12 Announce Google Group
+/// \version 1.13 Improvements to speed calculation. Cost of calculation is now less in the worst case, 
+///    and more or less constant in all cases. This should result in slightly beter high speed performance, and
+///    reduce anomalous speed glitches when other steppers are accelerating. 
+///    However, its hard to see how to replace the sqrt() required at the very first step from 0 speed.
+/// \version 1.14 Fixed a problem with compiling under arduino 0021 reported by EmbeddedMan
+/// \version 1.15 Fixed a problem with runSpeedToPosition which did not correctly handle
+///    running backwards to a smaller target position. Added examples
+/// \version 1.16 Fixed some cases in the code where abs() was used instead of fabs().
+/// \version 1.17 Added example ProportionalControl
+/// \version 1.18 Fixed a problem: If one calls the funcion runSpeed() when Speed is zero, it makes steps 
+///    without counting. reported by  Friedrich, Klappenbach.
+/// \version 1.19 Added MotorInterfaceType and symbolic names for the number of pins to use
+///               for the motor interface. Updated examples to suit.
+///               Replaced individual pin assignment variables _pin1, _pin2 etc with array _pin[4].
+///               _pins member changed to _interface.
+///               Added _pinInverted array to simplify pin inversion operations.
+///               Added new function setOutputPins() which sets the motor output pins.
+///               It can be overridden in order to provide, say, serial output instead of parallel output
+///               Some refactoring and code size reduction.
+/// \version 1.20 Improved documentation and examples to show need for correctly
+///               specifying AccelStepper::FULL4WIRE and friends.
+/// \version 1.21 Fixed a problem where desiredSpeed could compute the wrong step acceleration
+///               when _speed was small but non-zero. Reported by Brian Schmalz.
+///               Precompute sqrt_twoa to improve performance and max possible stepping speed
+/// \version 1.22 Added Bounce.pde example
+///               Fixed a problem where calling moveTo(), setMaxSpeed(), setAcceleration() more 
+///               frequently than the step time, even
+///               with the same values, would interfere with speed calcs. Now a new speed is computed 
+///               only if there was a change in the set value. Reported by Brian Schmalz.
+/// \version 1.23 Rewrite of the speed algorithms in line with 
+///               http://fab.cba.mit.edu/classes/MIT/961.09/projects/i0/Stepper_Motor_Speed_Profile.pdf
+///               Now expect smoother and more linear accelerations and decelerations. The desiredSpeed()
+///               function was removed.
+/// \version 1.24  Fixed a problem introduced in 1.23: with runToPosition, which did never returned
+/// \version 1.25  Now ignore attempts to set acceleration to 0.0
+/// \version 1.26  Fixed a problem where certina combinations of speed and accelration could cause
+///                oscillation about the target position.
+/// \version 1.27  Added stop() function to stop as fast as possible with current acceleration parameters.
+///                Also added new Quickstop example showing its use.
+/// \version 1.28  Fixed another problem where certain combinations of speed and accelration could cause
+///                oscillation about the target position.
+///                Added support for 3 wire full and half steppers such as Hard Disk Drive spindle.
+///                Contributed by Yuri Ivatchkovitch.
+/// \version 1.29  Fixed a problem that could cause a DRIVER stepper to continually step
+///                with some sketches. Reported by Vadim.
+/// \version 1.30  Fixed a problem that could cause stepper to back up a few steps at the end of
+///                accelerated travel with certain speeds. Reported and patched by jolo.
+/// \version 1.31  Updated author and distribution location details to airspayce.com
+/// \version 1.32  Fixed a problem with enableOutputs() and setEnablePin on Arduino Due that
+///                prevented the enable pin changing stae correctly. Reported by Duane Bishop.
+/// \version 1.33  Fixed an error in example AFMotor_ConstantSpeed.pde did not setMaxSpeed();
+///                Fixed a problem that caused incorrect pin sequencing of FULL3WIRE and HALF3WIRE.
+///                Unfortunately this meant changing the signature for all step*() functions.
+///                Added example MotorShield, showing how to use AdaFruit Motor Shield to control
+///                a 3 phase motor such as a HDD spindle motor (and without using the AFMotor library.
+/// \version 1.34  Added setPinsInverted(bool pin1Invert, bool pin2Invert, bool pin3Invert, bool pin4Invert, bool enableInvert) 
+///                to allow inversion of 2, 3 and 4 wire stepper pins. Requested by Oleg.
+/// \version 1.35  Removed default args from setPinsInverted(bool, bool, bool, bool, bool) to prevent ambiguity with 
+///                setPinsInverted(bool, bool, bool). Reported by Mac Mac.