Original example found here: https://github.com/martinberlin/cale-idf/wiki/Parallel-epapers-driven-by-Epdiy-with-I2S-Data-bus These are the small changes I made to get it to compile with esp-idf v4.3-beta1

notes.txt

added line 6
changed line 39 - from display.setFont(&Ubuntu_M36pt7b); to display.setFont(&Ubuntu_M24pt8b);
added line 41 display.update();

rotate_test.cpp

// Run idf.py menuconfig-> Component Config -> E-Paper driver and select:
// Display type: LILIGO 4.7 ED047TC1
// Board: LILIGO T5-4.7 Epaper
// In the same section Component Config -> ESP32 Specifics -> Enable PSRAM
#include "parallel/ED047TC1.h"
#include "freertos/task.h"

Ed047TC1 display;

// Include a font header
#include <Fonts/ubuntu/Ubuntu_M24pt8b.h>

extern "C" { void app_main(); }

void delay(uint32_t millis) { vTaskDelay(millis / portTICK_PERIOD_MS); }

void app_main(void)
{
   display.init(true);
   display.setRotation(1); // Working, 1 rotates 90° the display
   // Clear all screen to white
   display.clearScreen();
   delay(1000);

   // Draw some rectangles
   for (int x = 0; x < 200; x++) {

      for (int y = 0; y < 400; y++) {
         display.drawPixel(x, y, 0);
         display.drawPixel(x+200, y, 80);
         display.drawPixel(x+400, y, 160);
         display.drawPixel(x+600, y, 200);
         display.drawPixel(x+760, y, 230);
      }
   }

   // Draw some text using Ubuntu Font
   display.setCursor(30,200);
   display.setFont(&Ubuntu_M24pt8b);
   display.println("Hello world");
   display.update();
}