Lab 8

#include <EEPROM.h>
#include <LiquidCrystal.h>
LiquidCrystal Lcd (11, 9, 5, 6, 7, 8);
#include "ButtonDebounce.h"                                                 //includes Button Debounce
#include "EncoderMonitor.h"                                                 //includes Encoder Monitor
int EncoderTracking = encoderPosition + 2;
unsigned long DisplayUpdateTimer;                                           //displays lock onto LED
#define LCD_INTERVAL 100
#define LED_INTERVAL 500
unsigned int LCDTimer = millis();                                           // sets up LCD Timer
unsigned int LEDTimer = millis();                                           // sets up LED Timer
#define NUMBER_DIGITS 4                                                     // sets up number of digits in combination
int SerialInPtr = 0;                                                        // sets up the starting digits, which display when code starts via DisplayUpdateTimer
char Combination[NUMBER_DIGITS], SerialInput[NUMBER_DIGITS], Code[NUMBER_DIGITS]; // Combination is goal, Serial Input is manually edited, Code is used to compare to Cmbination
enum LockNextState {Locked, Unlocked,Code0, Code1, Code2, Code3}; //Declares the states of the lock
LockNextState LState; // creates a variable to call each state

void DisplayLcd (void) // Displays the 4 digits onto the LCD
{
  Lcd.clear();
  Lcd.home();
  Lcd.print( (int) Code[0] );                                               // 1st digit combo
  Lcd.print( (int) Code[1] );                                               // 2nd digit combo
  Lcd.print( (int) Code[2] );                                               // 3rd digit combo
  Lcd.print( (int) Code[3] );                                               // 4th digit combo
}



void setup ()
{
  ButtonInitialize ();                                                   // sets up the button press
  Lcd.begin (16, 2);
  Lcd.clear();                                                           //clears the LCD
  Lcd.home();                                                            //starting position for LCD
  DisplayUpdateTimer = millis();
  DisplayLcd();                                                          // Displays the above
  Serial.begin(9600);
  for ( int a = 0; a < NUMBER_DIGITS; a++)                               // a starts at 0, if it is lower than the number of digits, it goes up by 1
  {
    EEPROM.get(a, Combination[a]);                                       //once a is equivalent to the combination for that digit, EEPROM retrieves that number and stores it.
    if (Combination[a] < 0 || Combination[a] > 9)
    {
      Combination[a] = a + 1;

    }
    Serial.print( (int) Combination[a] );                                 // prints the integer selected
  }
  Serial.println (" ");
}

/*void ClearCode()
{
  for (int k = 0; k < NUMBER_DIGITS; k++ )
  Code[k]= 0 ;
}//end clear code
*/
int ComboVsCode()
{
  for ( int k = 0; k < NUMBER_DIGITS ; k++)
  {
    if (Code[k] != Combination[k] )
      return 0;
     //return 1;
  }
   return 1;
}

void LockNextState(int Button )
{
  switch ( LState )
  {
    case Unlocked:
      if ( Button == 3 )
        LState = Locked;
      break;
    case Locked:
      if ( Button == 2)
      {
        LState = Code0;
      }
      else if (ComboVsCode() )
      {
        LState = Unlocked;

      }
      break;
    case Code0:                                     //change code 0
      if ( Button == 2 )                            // short press
        LState = Code1;
      else if (Button == 3)                         // long press
        LState = Locked;
      break;
    case Code1:                                     //change code 1
      if ( Button == 2 )                            // short press
        LState = Code2;
      else if (Button == 3)                         // long press
        LState = Locked;
      break;
    case Code2:                                     //change code 2
      if ( Button == 2 )                            // short press
        LState = Code3;
      else if (Button == 3)                         // long press
        LState = Locked;
      break;
    case Code3:                                     //change code 3
      if ( Button == 2 )                            // short press
        LState = Locked;
      else if (Button == 3)                         // long press
        LState = Locked;
      break;
  } //ends switch
} // end LockNextState

void AdjustCode( int UpDown )
{
  int k = -1; //do nothing default
  switch ( LState )
  {
    case Unlocked:
      break;
    case Locked:
      break;
case Code0:
k=0;
break;
case Code1:
k=1;
break;
case Code2:
k=2;
break;
case Code3:
k=3;
break;
  }
  if ( k >= 0 && k <=9)
  {
  Code[k] += UpDown;
  if (Code[k] > 9 )
  Code[k] = 0;
  if (Code[k] < 0 )
  Code[k] = 9;
  }
}

void loop(){
  {
  LockNextState(ButtonNextState( digitalRead( 4 ) ) );
  }
  if (EncoderTracking - encoderPosition >= 4) //
  {
    AdjustCode(-1);                                                              //decrement
    EncoderTracking -= 4;
  }
  else if (EncoderTracking - encoderPosition <= -4)
  {
    AdjustCode( +1 );                                                            // increment
    EncoderTracking += 4;
  }
                                                                                 //turn on led if unlocked
  if (millis() - LEDTimer >= LED_INTERVAL )
  {
    if ( LState = Unlocked )
      PORTB == 0x20;                                                             //turn off led
    else //otherwise
      PORTB != 0x20;                                                             //toggle led
  }                                                                              // end of led flash
                                                                                 //timer to update display

  if (millis() - LEDTimer >= LCD_INTERVAL)

    if (millis() - LCDTimer >= 1000) {                                           //if 1 second has passed
      DisplayLcd();                                                              //displays lcd
      LCDTimer += 1000;                                                          //increment timer
    }

  if ( Serial.available() )                                                      //check for input from serial
  {
    char in = Serial.read();                                                     //read in char
    if (in > '0' && in <= '9' )                                                  //if it is a digit  greater than or equal to 0 and less than or equal to 9
    {
      SerialInput[SerialInPtr++] = in - '0';                                     //insert number into serial input
      if ( SerialInPtr == NUMBER_DIGITS )                                        //check if 4 digits have come in
      {
        for (int k = 0; k < NUMBER_DIGITS; k++ )                                 // recover combination
        {
          Serial.print (SerialInput[k] );                                        // If four digits have come in
          Combination[k] = SerialInput[k];                                       // Copy SerialInput to Combination
          EEPROM.put( k, Combination[k] );                                       //write to EEPROM

        }
      }
    }
  }
}