epaper code GxEPD2

main.cpp

#include <Arduino.h>
#include <GxEPD2_3C.h>
#include <Fonts/FreeMonoBold9pt7b.h>

GxEPD2_3C<GxEPD2_290_Z13c, GxEPD2_290_Z13c::HEIGHT> pdisplay(GxEPD2_290_Z13c(/*CS=D8*/ D8, /*DC=D3*/ D0, /*RST=D4*/ D1, /*BUSY=D2*/ D2)); // GDEH029Z13 128x296, UC8151D

const char HelloWorld[] = "Hello World!";

void setup() {
  Serial.begin(115200);

  Serial.println("Hello world");

  pdisplay.init(115200, true, 2, false);
  pdisplay.setRotation(1);
  pdisplay.setFont(&FreeMonoBold9pt7b);
  pdisplay.setTextColor(GxEPD_BLACK);
  int16_t tbx, tby; uint16_t tbw, tbh;
  pdisplay.getTextBounds(HelloWorld, 0, 0, &tbx, &tby, &tbw, &tbh);
  // center the bounding box by transposition of the origin:
  uint16_t x = ((pdisplay.width() - tbw) / 2) - tbx;
  uint16_t y = ((pdisplay.height() - tbh) / 2) - tby;
  pdisplay.setFullWindow();
  pdisplay.firstPage();
  do
  {
    pdisplay.fillScreen(GxEPD_WHITE);
    pdisplay.setCursor(x, y);
    pdisplay.print(HelloWorld);
  }
  while (pdisplay.nextPage());
}

void loop() {}

platformio.ini

[env]
upload_speed = 115200
monitor_speed = 115200

lib_deps = 
	zinggjm/GxEPD2@^1.4.9

[env:d1_mini]
platform = espressif8266
board = d1_mini
framework = arduino