#include <Wire.h>
#include <LiquidCrystal_I2C.h>

const int ENCA_PIN PROGMEM = 10;
const int ENCB_PIN PROGMEM =  9;
const int BTN_PIN  PROGMEM =  8;

#define BUTTON 7
boolean currentButton = HIGH;
boolean previousButton = HIGH;
byte pressCount = 0;
int selectCode = 0;


const int MODV PROGMEM = 96;

int encPos = 0;
int lastPinA = HIGH;

int x = 0;
int y = 0;

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C: 0x27, 16x2 LCD

void setup() {
  Serial.begin(9600);
  pinMode(ENCA_PIN, INPUT);
  pinMode(ENCB_PIN, INPUT);
  pinMode(BTN_PIN, INPUT_PULLUP);
  pinMode(BUTTON, INPUT_PULLUP);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.blink();
}

void loop() {
/*
  //BUTTONで英字/数字/記号の切替え　0=0x30 A=0x41 a=0x61 
  currentButton = digitalRead(BUTTON);
  if(currentButton == LOW && previousButton == HIGH){
    pressCount++;
  }
  previousButton=currentButton;
  

  if(pressCount>3){
    pressCount=0;
  }

  switch (pressCount){
    case 0:
    selectCode = 0x30;
    break;

    case 1:
    selectCode = 0x41;
    break;

    case 2:
    selectCode = 0x61;
    break;

    case 3:
    selectCode = 0x7F;
    break;

  }
*/
  int v = digitalRead(ENCA_PIN);

  char c; //初期表示はスペース

  //エンコーダ回転
  if ((lastPinA == LOW) && (v == HIGH)) {  
    if (digitalRead(ENCB_PIN) == LOW) 
      encPos++;
    else 
      encPos--;
    encPos = (encPos + MODV) % MODV; // encPos MOD 96
    c = encPos + 0x20; //ASCIIスペースから回転分進んだ文字 
    lcd.print(c);
    lcd.setCursor(x, y);
  }

  c = encPos + 0x20;

  //センタークリック  
  if (digitalRead(BTN_PIN) == LOW) {  
    if (c == 0x7F) {  //ASCIIコード　削除 127
      lcd.setCursor(x, y);
      lcd.print(" ");
      if  ((y == 1) || (x > 0))
        x--;
      if (x < 0) {
        x = 15;
        y--;
      }
    } else {
      if  ((y == 0) || (x < 15))
        x++;
      if (x > 15) {
        x = 0;
        y++;
      }
    }    
    lcd.setCursor(x, y);
    lcd.print(c);
    lcd.setCursor(x, y);
    delay(500);
  }      
  lastPinA = v;






}