zGxEPD2/extras/tests/GxEPD2_MinimumExample/GxEPD2_MinimumExample.ino

// GxEPD2_MinimumExample.ino by Jean-Marc Zingg

// purpose is e.g. to determine minimum code and ram use by this library

// see GxEPD2_wiring_examples.h of GxEPD2_Example for wiring suggestions and examples
// if you use a different wiring, you need to adapt the constructor parameters!

// uncomment next line to use class GFX of library GFX_Root instead of Adafruit_GFX, to use less code and ram
//#include <GFX.h>

#include <GxEPD2_BW.h> // including both doesn't use more code or ram
#include <GxEPD2_3C.h> // including both doesn't use more code or ram
#include <GxEPD2_7C.h> // same for all three

// select the display class and display driver class in the following file (new style):
#include "GxEPD2_display_selection_new_style.h"

// alternately you can copy the constructor from GxEPD2_display_selection.h or GxEPD2_display_selection_added.h of GxEPD2_Example to here
// e.g. for Wemos D1 mini:
//GxEPD2_BW<GxEPD2_154_D67, GxEPD2_154_D67::HEIGHT> display(GxEPD2_154_D67(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEH0154D67

void setup()
{
  //display.init(115200); // default 10ms reset pulse, e.g. for bare panels with DESPI-C02
  display.init(115200, true, 2, false); // USE THIS for Waveshare boards with "clever" reset circuit, 2ms reset pulse
  // comment out next line to have no or minimal Adafruit_GFX code
  display.setTextColor(GxEPD_BLACK);
  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() {};