Update comments to match change in stepper.cpp

libraries/Stepper/stepper.h

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+
+  Stepper.h - - Stepper library for Wiring/Arduino - Version 0.4
+
+  Original library     (0.1) by Tom Igoe.
+  Two-wire modifications   (0.2) by Sebastian Gassner
+  Combination version   (0.3) by Tom Igoe and David Mellis
+  Bug fix for four-wire   (0.4) by Tom Igoe, bug fix from Noah Shibley
+  High-speed stepping mod and timer rollover fix   (0.5) by Eugene Kozlenko
+
+  Drives a unipolar or bipolar stepper motor using  2 wires or 4 wires
+
+  When wiring multiple stepper motors to a microcontroller,
+  you quickly run out of output pins, with each motor requiring 4 connections. 
+
+  By making use of the fact that at any time two of the four motor
+  coils are the inverse  of the other two, the number of
+  control connections can be reduced from 4 to 2. 
+
+  A slightly modified circuit around a Darlington transistor array or an L293 H-bridge
+  connects to only 2 microcontroler pins, inverts the signals received,
+  and delivers the 4 (2 plus 2 inverted ones) output signals required
+  for driving a stepper motor.  Similarly the Arduino motor shields 2 direction pins
+  may be used.
+
+  The sequence of control signals for 4 control wires is as follows:
+
+  Step C0 C1 C2 C3
+     1  1  0  1  0
+     2  0  1  1  0
+     3  0  1  0  1
+     4  1  0  0  1
+
+  The sequence of controls signals for 2 control wires is as follows
+  (columns C1 and C2 from above):
+
+  Step C0 C1
+     1  0  1
+     2  1  1
+     3  1  0
+     4  0  0
+
+  The circuits can be found at 
+  http://www.arduino.cc/en/Tutorial/Stepper
+*/
+
+// ensure this library description is only included once
+#ifndef Stepper_h
+#define Stepper_h
+
+// library interface description
+class Stepper {
+  public:
+    // constructors:
+    Stepper(int number_of_steps, int motor_pin_1, int motor_pin_2);
+    Stepper(int number_of_steps, int motor_pin_1, int motor_pin_2, int motor_pin_3, int motor_pin_4);
+
+    // speed setter method:
+    void setSpeed(long whatSpeed);
+
+    // mover method:
+    void step(int number_of_steps);
+
+    int version(void);
+
+  private:
+    void stepMotor(int this_step);
+
+    int direction;        // Direction of rotation
+    int speed;          // Speed in RPMs
+    unsigned long step_delay;    // delay between steps, in us, based on speed
+    int number_of_steps;      // total number of steps this motor can take
+    int pin_count;        // whether you're driving the motor with 2 or 4 pins
+    int step_number;        // which step the motor is on
+
+    // motor pin numbers:
+    int motor_pin_1;
+    int motor_pin_2;
+    int motor_pin_3;
+    int motor_pin_4;
+
+    long last_step_time;      // time stamp in us of when the last step was taken
+};
+
+#endif