#include <GxFont_GFX.h>
#include <GxEPD.h>
//#include <GxGDEP015OC1/GxGDEP015OC1.h>
#include <GxGDEH029A1/GxGDEH029A1.h>      // 2.9" b/w
#include <GxIO/GxIO_SPI/GxIO_SPI.h>
#include <GxIO/GxIO.h>
#include <Fonts/FreeMonoBold9pt7b.h>
GxIO_Class io(SPI, /*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16); // arbitrary selection of 17, 16
GxEPD_Class display(io, /*RST=*/ 16, /*BUSY=*/ 4); // arbitrary selection of (16), 4



void setup() {

  // put your setup code here, to run once:
  // setup the display
  Serial.begin(115200);

  display.init(115200);
  
  // colours are good.
  display.fillScreen(GxEPD_WHITE);
  display.setTextColor(GxEPD_BLACK);
   display.update();

  // load a font - in the library
  display.setFont(&FreeMonoBold9pt7b);

   display.setCursor(0, 0);
        display.println();
        display.println("hello");
        display.update();
}

void loop() {

  //addresses
  String line1="@1";
  String clearLCD="@C";



  //Collect serial information in a string
  String input="";
  if (Serial.available()){
    input=Serial.readString();
    delay(100);



    //if string begins with 1@ print on line 1
    if (input.startsWith(line1)){
    
      input.remove(0, 2);
        display.setCursor(0, 0);
        display.println();
        display.println(input);
        display.update();
     }


  //clear the LCD
    if (input.startsWith(clearLCD)){
    display.fillScreen(GxEPD_WHITE);
    display.setTextColor(GxEPD_BLACK);
    display.update();
    }
  }


}