Arduino - Waveshare epaper SPI Test Example

// Working Test-Code via SPI for epaper - Waveshare 2.9 V2

#include <SPI.h>
#include <GxEPD2_BW.h>
#include <Fonts/FreeMonoBold9pt7b.h>

GxEPD2_BW<GxEPD2_290_T94_V2, GxEPD2_290_T94_V2::HEIGHT> display(
  GxEPD2_290_T94_V2(5, 17, 16, 4)
);
int i = 0;
void setup() {

  Serial.begin(115200);
  SPI.begin(18, 19, 23);  // SCK, MISO, MOSI
  display.init(115200, true, 2, false);
}

void loop() {
  const char text[] = "Hello World!";
  i = i + 1;
  display.setRotation(1);
  display.setFont(&FreeMonoBold9pt7b);
  display.setTextColor(GxEPD_BLACK);

  int16_t tbx, tby; uint16_t tbw, tbh;
  display.getTextBounds(text, 0, 0, &tbx, &tby, &tbw, &tbh);
  uint16_t x = ((display.width() - tbw) / 2) - tbx;
  uint16_t y = ((display.height() - tbh) / 2) - tby;

  display.setFullWindow();
  display.firstPage();
  do {
    display.fillScreen(GxEPD_WHITE);
    display.setCursor(x, y);
    display.print(String(text) + String(i));
  } while (display.nextPage());
  Serial.println("Refresh done! Waiting for next one...");
  delay(20000);
}