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/*
 * Encoder on A2, A3 
 * Button on A1
 * MAX 485: 5v to DE, D8 to DI.  A and B to A and B of the treadmill controller
 * TM1637 display clock on 2, data on 3
 * Short out the middle "safety key" pins 
 * Take power from one of the treadmill controller pins (which one?)
 * Treadmill header has 8 pins (left to right, latch at the bottom):
 * 1 - 12v
 * 2 - 12v
 * 3 - A or B?
 * 4 - Safety switch
 * 5 - Safety switch
 * 6 - A or B?
 * 7 - Ground
 * 8 - Ground
*/




#include <AltSoftSerial.h>
//https://www.pjrc.com/teensy/td_libs_AltSoftSerial.html

#include <SimpleTimer.h>
//https://github.com/jfturcot/SimpleTimer

#include <RotaryEncoder.h>
//http://www.mathertel.de/Arduino/RotaryEncoderLibrary.aspx
//https://github.com/mathertel/RotaryEncoder

#include "OneButton.h"
//https://github.com/mathertel/OneButton

#include <TM1637Display.h>
//https://github.com/avishorp/TM1637

#include <EEPROMex.h>
//https://github.com/thijse/Arduino-EEPROMEx

const int encoderButton = A1;
const int encoderA = A2;
const int encoderB = A3;
const int dispClock = 2; //D2
const int dispData = 3; //D3


AltSoftSerial ss;
SimpleTimer timer;
OneButton encoderButt(encoderButton, true);
RotaryEncoder encoder(A2, A3);
TM1637Display display1(dispClock, dispData);

bool halt = true;
int setSpeed = 0;
int curSpeed = 0; //ramp this up until it reaches the set speed
int savedSpeed = 0;
const int speedCount = 123;

const byte b1[] = {0,0,0,0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,16,16,16,16,16,16,16,16};
const byte b2[] = {0,161,195,230,8,42,76,111,145,179,213,248,26,60,94,129,163,197,231,10,44,78,112,147,181,215,249,28,62,96,130,165,199,233,11,46,80,114,148,183,217,251,29,64,98,132,166,200,235,13,47,81,116,150,184,218,253,31,65,99,134,164,202,236,15,49,83,117,152,186,220,254,33,67,101,135,170,204,238,16,51,85,119,153,188,222,0,34,101,103,137,171,206,240,18,52,87,121,155,173,224,2,36,70,105,139,173,207,242,20,54,88,123,157,191,225,4,20,54,88,123,157,191,225};
const byte b3[] = {221,16,201,186,144,116,105,188,33,197,216,18,156,188,101,79,171,182,82,43,11,210,8,154,186,99,250,96,132,229,70,87,142,23,64,51,212,48,87,130,38,194,136,186,94,57,221,121,172,63,219,60,79,236,117,172,189,135,230,2,54,175,118,86,112,234,51,19,158,122,103,131,132,93,125,222,20,9,237,132,81,76,168,118,5,220,105,141,161,69,139,127,49,235,188,156,116,237,78,110,92,210,242,43,131,32,0,217,80,195,39,131,86,49,213,180,119,195,39,131,86,49,213,180};
const int sfm[] = {0,262,314,366,418,471,523,575,628,680,732,785,837,889,941,994,1046,1098,1151,1203,1255,1308,1360,1412,1464,1517,1569,1621,1674,1726,1778,1831,1883,1935,1987,2040,2092,2144,2197,2249,2301,2355,2406,2458,2510,2563,2615,2667,2721,2772,2824,2878,2929,2981,3033,3087,3138,3190,3244,3295,3347,3401,3453,3504,3556,3610,3661,3713,3767,3818,3870,3924,3976,4027,4079,4133,4184,4236,4290,4342,4393,4447,4499,4550,4602,4656,4708,4759,4813,4865,4916,4970,5022,5074,5125,5179,5231,5282,5336,5388,5440,5493,5545,5597,5648,5702,5754,5805,5859,5911,5963,6016,6068,6120,6171,6225,6277,6329,6382,6434,6486,6539,6591,6643};

//eeprom memory locations
const int memAddress = 20;
const int memBase = 350;


void setup() {
  //interrupts for encoder
  PCICR |= (1 << PCIE1);    // This enables Pin Change Interrupt 1 that covers the Analog input pins or Port C.
  PCMSK1 |= (1 << PCINT10) | (1 << PCINT11);  // This enables the interrupt for pin 2 and 3 of Port C.
  //Serial.begin(9600);
  ss.begin(9600);
  timer.setInterval(100, sendSpeedPacket);
  encoderButt.attachClick(startStop);

  // Set Up EEPROM
  EEPROM.setMemPool(memBase, EEPROMSizeNano);

  //Load the stored speed value
  setSpeed = EEPROM.readInt(memAddress);

  display1.setBrightness(2);
  updateDisplay();
}

void loop() {
  // put your main code here, to run repeatedly:
  timer.run();
  encoderButt.tick();
  readEncoder();
  updateDisplay();
}

void sendSpeedPacket() {

  if(halt == true) { //send the stop packet
    ss.write((byte)0);
    ss.write((byte)255);
    ss.write((byte)241);
    ss.write((byte)2);
    ss.write((byte)0);
    ss.write((byte)0);
    ss.write((byte)221);
  }
  else { //send the current speed packet
    ss.write((byte)0);
    ss.write((byte)255);
    ss.write((byte)241);
    ss.write((byte)2);
    ss.write((byte)b1[curSpeed]);
    ss.write((byte)b2[curSpeed]);
    ss.write((byte)b3[curSpeed]);   
  }

  if (halt == true){
    curSpeed = 0;
  }

  if (curSpeed < setSpeed && halt == false) { //this ramps the sent speed up until it hits the set speed
    curSpeed++;
  }
  if (curSpeed > setSpeed && halt == false) { //this immediately reduces the sent speed to the set speed
    curSpeed = setSpeed;
  }

  //Serial.print(halt);
  //Serial.print(" ");
  //Serial.println(curSpeed);
  
}

void startStop () {
  halt = !halt;
  EEPROM.writeInt(memAddress, setSpeed); //save the speed every time the button is pushed... so that on next power up it is not zero
}

void readEncoder() {
  static int pos = 0;

  int newPos = encoder.getPosition();
      if (pos > newPos) {
        setSpeed = setSpeed - 1;
      }
      else if (pos < newPos) {
        setSpeed = setSpeed + 1;
      }
      pos = newPos; //--keep

      setSpeed = constrain(setSpeed, 0, speedCount);


}

ISR(PCINT1_vect) {
  encoder.tick(); // just call tick() to check the state.
}


void updateDisplay() {
  display1.showNumberDecEx(sfm[setSpeed], 0, true);  //Set time should always show on display 1
//  Serial.print("Minutes: ");
//  Serial.print(seconds / 60);
//  Serial.print("Seconds: ");
//  Serial.println(seconds & 60);
}