M5Paper で 文字を点滅

こちらのプログラムを改造して文字を点滅させてみました。
M5Paper で Hello World

hello_blink.ino

// ---------------------------------------------------------------
//	hello_blink.ino
//
//					Jun/02/2022
// ---------------------------------------------------------------
#include <M5EPD.h>

M5EPD_Canvas canvas(&M5.EPD);

  String ssx[] = {"Hello World","Good Morning","Good Afternoon",
    "Good Evening","Good Night"};

// ---------------------------------------------------------------
void setup(){
    M5.begin();
    M5.EPD.Clear(true);

    M5.RTC.begin();
    canvas.createCanvas(960, 540);
    canvas.setTextSize(5);
    int xx = 100;
    int yy_start = 30;

  for (int it=0; it< 5; it++)
  {
    int yy = yy_start + it * 80;
    canvas.drawString(ssx[it], xx, yy);
  }
 
    canvas.drawString("Jun/2/2022 PM 14:27", xx+100, yy_start+400);
    canvas.pushCanvas(0,0,UPDATE_MODE_DU4);
}

// ---------------------------------------------------------------
void loop(){
    int xx = 100;
    int yy_start = 30;

  for (int it=0; it< 5; it++)
  {
    int yy = yy_start + it * 80;
    canvas.drawString("               ", xx, yy);
    canvas.pushCanvas(0,0,UPDATE_MODE_DU4);
	delay (1000);
    canvas.drawString(ssx[it], xx, yy);
    canvas.pushCanvas(0,0,UPDATE_MODE_DU4);
	delay (1000);
  }

}
// ---------------------------------------------------------------

Arduino IDE