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/*Web: http://www.buydisplay.com
EastRising Technology Co.,LTD
Examples for ER-EPM042-1B
Display is Hardward SPI 4-Wire SPI Interface 
Tested and worked with:
Works with Arduino 1.6.0 IDE  
Works with Arduino DUE,Arduino mega2560,Arduino UNO Board
****************************************************/

#include <SPI.h>
#include "ER-EPM042-1B.h"
#include "imagedata.h"
#include "epdpaint.h"

#define COLORED     0
#define UNCOLORED   1

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Epd epd;

  if (epd.Init() != 0) {
    Serial.print("e-Paper init failed");
    return;
  }

  /* This clears the SRAM of the e-paper display */
  epd.ClearFrame();

  /**
    * Due to RAM not enough in Arduino UNO, a frame buffer is not allowed.
    * In this case, a smaller image buffer is allocated and you have to 
    * update a partial display several times.
    * 1 byte = 8 pixels, therefore you have to set 8*N pixels at a time.
    */
  #if 1  
  unsigned char image[1500];
  Paint paint(image, 400, 28);    //width should be the multiple of 8 

  paint.Clear(UNCOLORED);
  paint.DrawStringAt(0, 0, "e-Paper Demo", &Font24, COLORED);
  epd.SetPartialWindow(paint.GetImage(), 100, 40, paint.GetWidth(), paint.GetHeight());

  paint.Clear(COLORED);
  paint.DrawStringAt(30, 2, "www.buydisplay.com", &Font24, UNCOLORED);
  epd.SetPartialWindow(paint.GetImage(), 0, 64, paint.GetWidth(), paint.GetHeight());
  
  paint.SetWidth(64);
  paint.SetHeight(64);

  paint.Clear(UNCOLORED);
  paint.DrawRectangle(0, 0, 40, 50, COLORED);
  paint.DrawLine(0, 0, 40, 50, COLORED);
  paint.DrawLine(40, 0, 0, 50, COLORED);
  epd.SetPartialWindow(paint.GetImage(), 72, 120, paint.GetWidth(), paint.GetHeight());
  
  paint.Clear(UNCOLORED);
  paint.DrawCircle(32, 32, 30, COLORED);
  epd.SetPartialWindow(paint.GetImage(), 200, 120, paint.GetWidth(), paint.GetHeight());

  paint.Clear(UNCOLORED);
  paint.DrawFilledRectangle(0, 0, 40, 50, COLORED);
  epd.SetPartialWindow(paint.GetImage(), 72, 200, paint.GetWidth(), paint.GetHeight());

  paint.Clear(UNCOLORED);
  paint.DrawFilledCircle(32, 32, 30, COLORED);
  epd.SetPartialWindow(paint.GetImage(), 200, 200, paint.GetWidth(), paint.GetHeight());

  /* This displays the data from the SRAM in e-Paper module */
  epd.DisplayFrame();
 delay(2000);
  #endif 
  
#if 1
  /* This displays an image */
  epd.DisplayFrame(IMAGE_BUTTERFLY);
 delay(2000);
 
  epd.SendCommand(VCOM_AND_DATA_INTERVAL_SETTING);
    epd.SendData(0x87); 
     epd.DisplayFrame(IMAGE_BUTTERFLY);    
       delay(2000); 
      epd.SendCommand(VCOM_AND_DATA_INTERVAL_SETTING);
    epd.SendData(0xF7);       
  #endif  
  
#if 0      
      
     epd.DisplayFrame(IMAGE_BUTTERFLY1);
        delay(2000);  
     epd.SendCommand(VCOM_AND_DATA_INTERVAL_SETTING);
    epd.SendData(0x87);     
     epd.DisplayFrame(IMAGE_BUTTERFLY1);  
      delay(2000);
       epd.SendCommand(VCOM_AND_DATA_INTERVAL_SETTING);
    epd.SendData(0xF7);       
 #endif 
 
  delay(15000);
  epd.ClearFrame();
  epd.DisplayFrame(); 
  
  /* Deep sleep */
  epd.Sleep();
}

void loop() {
  // put your main code here, to run repeatedly:

}

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exit status 1
lvalue required as left operand of assignment

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if (epd.Init() == 0) {