zGxEPD2/examples/GxEPD2_MinimumExample/GxEPD2_MinimumExample.ino

// GxEPD2_MinimumExample.ino by Jean-Marc Zingg

// uncomment next line to use class GFX of library GFX_Root instead of Adafruit_GFX
#include <GFX.h>

#define ENABLE_GxEPD2_GFX 0
#include <GxEPD2_BW.h> // including both doesn't hurt
#include <GxEPD2_3C.h> // including both doesn't hurt

// copy constructor for your e-paper from GxEPD2_Example.ino, and for AVR needed #defines
#define MAX_DISPLAY_BUFFER_SIZE 800 // 
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8) ? EPD::HEIGHT : MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8))
//GxEPD2_BW<GxEPD2_154, MAX_HEIGHT(GxEPD2_154)> display(GxEPD2_154(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7)); // GDEP015OC1 no longer available
GxEPD2_BW<GxEPD2_154_D67, MAX_HEIGHT(GxEPD2_154_D67)> display(GxEPD2_154_D67(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7)); // GDEH0154D67

void setup()
{
  display.init();
  display.firstPage();
  do
  {
    display.fillScreen(GxEPD_WHITE);
    // comment out next line to have no or minimal Adafruit_GFX code
    display.print("Hello World!");
  }
  while (display.nextPage());
}

void loop() {};