// ---------------------------------------------------------
// I2C - LCD Anzeige
// Pinning: ESP32 D22 <=> SCL I2C_LCD
//                D21 <=> SDA
//                3V3 <=> Vcc
//                GND <=> GND
// Befehle:
// oLCD.init ()
// oLCD.backlight ();
// oLCD.clear ();
// oLCD.setCursor (iSpalte,iZeile);
// oLCD.printf ("Hallo");
#include <LiquidCrystal_I2C.h>
#include <string.h>
#include <stdio.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4
//----------------------------------------------------------
#define mup 4
#define mdown 2
#define mright 3
#define mleft 5

LiquidCrystal_I2C oLCD (I2C_ADDR, LCD_COLUMNS, LCD_LINES);
// ---------------------------------------------------------


char sLCDText[30];
int iZeile = 3;
int iSpalte = 0;

void LCDPrintCharSZ(int iSpalte,int iZeile,char cZeichen)
{
  char sBuchstabe[2];
  if (iZeile < 0) return;
  if (iSpalte < 0) return;
  if (iZeile >= LCD_LINES) return;
  if (iSpalte >= LCD_COLUMNS) return;

  sprintf (sBuchstabe,"%c",cZeichen);

  oLCD.setCursor(iSpalte, iZeile);
  oLCD.print(sBuchstabe);


}

void LCDPrintSZ(int iSpalte, int iZeile)
{
  int iIndex;
  for (iIndex=0;iIndex < strlen (sLCDText);iIndex++)
  {
    LCDPrintCharSZ(iSpalte+iIndex,iZeile,sLCDText[iIndex]);

  }

}

void LCDCurset(int iSpalte, int iZeile)
{
  if (digitalRead(mdown) == LOW)
    iSpalte = iSpalte - 1;

  if (digitalRead(mup) == LOW)
    iSpalte = iSpalte + 1;

  if (digitalRead(mleft) == LOW)
    iZeile = iZeile - 1;

  if (digitalRead(mright) == LOW)
    iZeile = iZeile + 1;
  
}


void setup()
{
  oLCD.init();
  oLCD.backlight();

  pinMode(mup, INPUT_PULLUP);
  pinMode(mdown, INPUT_PULLUP);
  pinMode(mleft, INPUT_PULLUP);
  pinMode(mright, INPUT_PULLUP);
}


void loop()
{
  strcpy(sLCDText, "1234567890");
  if (digitalRead(mdown) == LOW)
    iSpalte = iSpalte - 1;
    LCDPrintSZ(iZeile,iSpalte); 
  if (digitalRead(mup) == LOW)
    iSpalte = iSpalte + 1;
    LCDPrintSZ(iZeile,iSpalte); 
  if (digitalRead(mleft) == LOW)
    iZeile = iZeile - 1;
    LCDPrintSZ(iZeile,iSpalte); 
  if (digitalRead(mright) == LOW)
    iZeile = iZeile + 1;
    LCDPrintSZ(iZeile,iSpalte); 
    
  LCDPrintSZ(iZeile,iSpalte);   

  delay(100);

}