// https://wokwi.com/projects/399355387445360641
// for https://forum.arduino.cc/t/limit-switch-issue-for-stepper-motor-application/1265784/12
//
// based on sim https://wokwi.com/projects/388661915235241985
// and https://github.com/waspinator/AccelStepper/tree/master/examples/Bounce
// adding a state machine to have an un-balanced CW-CCW movement
// and a limited number of cycle counts for
//

//
// Bounce.pde -- adapted for state machine
// -*- mode: C++ -*-
//
// Make a single stepper bounce from one limit to another
//
// Copyright (C) 2012 Mike McCauley
// $Id: Random.pde,v 1.1 2011/01/05 01:51:01 mikem Exp mikem $

#include <AccelStepper.h> // https://www.airspayce.com/mikem/arduino/AccelStepper/index.html


class myAccelStepper : public AccelStepper
{
  public:
    boolean myAccelStepper::stepAsNeeded()
    {
      bool stepped = false;
      if (stepped = runSpeed())
        computeNewSpeed();
      return stepped;
    }
    using AccelStepper::AccelStepper;
    using AccelStepper::setMaxSpeed;
    using AccelStepper::moveTo;
};


// Define a stepper and the pins it will use
myAccelStepper stepper(1, 10, 7); // Defaults to AccelStepper::FULL4WIRE (4 pins) on 2, 3, 4, 5

const byte limitSwitchPin = A1;

int stateSwitch = 0; // CCW, CW, IDLE
long positionAbs = 200;
long bigPos = 1000;
int cycleCount = 2;  // CCW counts
int currentCycle = 0;
const byte s2Dir = 8, s2Step = 9;

void setup()
{
  Serial.begin(115200);
  pinMode(limitSwitchPin, INPUT_PULLUP);
  // Change these to suit your stepper if you want
  stepper.setMaxSpeed(100);
  stepper.setAcceleration(100);
  stepper.moveTo(-500);
  stepper.run();
  Serial.print("s-");

  pinMode(s2Dir, OUTPUT);
  pinMode(s2Step, OUTPUT);
  digitalWrite(s2Dir, LOW);

}


void loop()
{

  bool limitSwitchActive = digitalRead(limitSwitchPin) == LOW || stepper.currentPosition() < -100;

  // If at the end of travel go to the other end
  switch (stateSwitch) {
    case 0: // moving CCW
      if (stepper.distanceToGo() == 0 // finished motion?
          || limitSwitchActive // active limit switch
         )
      {
        currentCycle += 1;
        digitalWrite(s2Dir, HIGH);

        if (currentCycle <= cycleCount) {
          stepper.moveTo(bigPos - positionAbs);
          stateSwitch = 1; // move CW
          Serial.print("0+");
        } else {
          stateSwitch = 2; // go idle
        }

      }
      break;
    case 1: // moving CW
      if (stepper.distanceToGo() == 0) {
        stepper.moveTo(-positionAbs);
        stateSwitch = 0;
        digitalWrite(s2Dir, LOW);
        Serial.print("1-");

      }
      break;
    case 2: // IDLE
      ; // do nothing
      break;
  }
  //stepper.run(); // move stepper as needed
  //if (stepper.runSpeed()) {
  //  stepper.computeNewSpeed();
  //}
  if (stepper.stepAsNeeded() == true) {
    pulse2();
    //  Serial.print('.');
  }
}

void pulse2(void) {
  static byte state = 0;
  const byte stepPin = s2Step;
  state = !state; // flip-flop  divide by 2
  if (state) {
    digitalWrite(stepPin, HIGH);
    digitalWrite(stepPin, LOW);
  }

}