// LCD1602 to Arduino Uno connection example

#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

  char COM1_A[8] = "123.123";
  char COM1_S[8] = "121.500";

  int COM1_S_arr[4] = {1, 21, 5, 0};

#define ENCODER_CLK 2
#define ENCODER_DT  3
#define ENCODER_SW  4

#define BUTTON_PIN 6

boolean SW_STATE = HIGH;
boolean ESW_STATE = HIGH;
int MODE = 0;

void inttochar(const int *arr){
  for (i = 0;i<=4;i++){
    itoa(arr[i], cstr, 10);
  }

  COM1_S[]
}

void setup() {
  lcd.begin(16, 2);
  // you can now interact with the LCD, e.g.:
  printall();

  pinMode(BUTTON_PIN, INPUT_PULLUP);

  // Initialize encoder pins
  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
  pinMode(ENCODER_SW, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(ENCODER_CLK), readEncoder, FALLING);
}

void readEncoder() {
  int dtValue = digitalRead(ENCODER_DT);
  if (dtValue == HIGH) {
   increase();
  }
  if (dtValue == LOW) {
  //  counter--; // Counterclockwise
  }
}

void increase (){
  switch (MODE) {
  case 1:
    lcd.setCursor(10,0);
    lcd.blink();
    break;
  case 2:
    // statements
    break;
  case 3:
    // statements
    break;
  default:
    // statements
    break;
}
}

void switchCOM1(){
  char tmp[8];
  strcpy (tmp,COM1_A);
  strcpy (COM1_A, COM1_S);
  strcpy (COM1_S, tmp);
  printall();
}

void printall(){
  pCOM1_A(COM1_A);
  pCOM1_S(COM1_S);
}

void pCOM1_A(const char *freq){
  lcd.setCursor(0,0);
  lcd.print(freq);
}

void pCOM1_S(const char *freq){
  lcd.setCursor(9,0);
  lcd.print(freq);
}


void loop() {

  boolean sw_value = digitalRead(BUTTON_PIN);
  if (SW_STATE != sw_value) {
    SW_STATE = sw_value;
    if (sw_value == HIGH) {
      //Serial.println(" released");
    }
    if (sw_value == LOW) {
      switchCOM1();
    }
  }

  boolean esw_value = digitalRead(ENCODER_SW);
  ESW_STATE = esw_value;
  if (esw_value == HIGH) {
    //Serial.println(" released");
  }
  if (esw_value == LOW) {
    if (MODE <= 3) {
      MODE ++;
    }
    else {
      MODE = 0;
    }
  }
}