/*
  Hitachi HD44780 Char ROM A00
*/

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

void printGroup(int group) {
  Serial.print("\nShowing ASCII values ");
  Serial.print(group);
  Serial.print(" through ");
  Serial.println(group + 31);
  delay(2000);
}

void setup() {
  Serial.begin(115200);
  Serial.println("\nThis demo shows the chars stored in the");
  Serial.println("'A00' ROM commonly shipped with LCD displays");
  Serial.println("powered by Hitachi HD44780 chips.");
  lcd.init();
  lcd.backlight();
  bool row = 0;
  int charNum = 0;
  int groupNum = 0;
  printGroup(0);

/*
  //for (charNum = 0; charNum < 256; charNum)
  for (int group = 0; group <= 8; group++)  {
    groupNum = group * 32;
    //row = 0;
    row? row = 1 : row = 0;
    for (int col = 0; col < 16; col++)  {
      lcd.setCursor(col, row);
      lcd.print(char((group * 32) + col));
            Serial.print("Char ");
      Serial.print((group * 32) + col);
      Serial.println(" decimal, ");
      //charNum++;
      //if (charNum == 256) break;
      delay(100);    
    }
    //row? row = 1 : row = 0;
    //row = 1;
  }
  */

  ///*
    for (int group = 0; group < 16; group++) {
    groupNum = group * 16;
    for (int col = 0; col < 16; col++)  {
      lcd.setCursor(col, row);
      lcd.print(char(charNum + groupNum));
      Serial.print("Char ");
      Serial.print(charNum + groupNum);
      Serial.print(" decimal, ");
      Serial.print("0x");
      Serial.print(charNum + groupNum, HEX);
      Serial.print(" hex, ");
      Serial.print((char)(charNum + groupNum));
      Serial.println(" unicode.");
      delay (500);
      charNum++;
      if (groupNum + charNum == 256)  {
        Serial.println("\nValues from 0 - 255 printed.");
        break;
      }
      if (charNum % 16 == 0)  {
        charNum = 0;
        if (row == 0) {
          row = 1;
        } else {
          row = 0;
          lcd.clear();
          printGroup((group + 1) * 16);
        }
      }
    }
    }
  //*/
}

void loop() {
  // nothing to loop about
}