diff --git a/epd2in7.md b/epd2in7.md
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-/**
-    @filename   :   epd2in7-demo.ino
-    @brief      :   2.7inch e-paper display demo
-    @author     :   Yehui from Waveshare
-
-    Copyright (C) Waveshare     August 22 2017
-
-   Permission is hereby granted, free of charge, to any person obtaining a copy
-   of this software and associated documnetation files (the "Software"), to deal
-   in the Software without restriction, including without limitation the rights
-   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-   copies of the Software, and to permit persons to  whom the Software is
-   furished to do so, subject to the following conditions:
-
-   The above copyright notice and this permission notice shall be included in
-   all copies or substantial portions of the Software.
-
-   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-   FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-   LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-   THE SOFTWARE.
-*/
-
-
-#include <SPI.h>
-#include "epd2in7.h"
-#include "epdpaint.h"
-
-#define COLORED     0
-#define UNCOLORED   1
-
-void setup() {
-  // put your setup code here, to run once:
-  Serial.begin(115200);
-  Epd epd;
-
-  Serial.print("e-Paper init\r\n");
-  if (epd.Init() != 0) {
-    Serial.print("e-Paper init failed\r\n");
-    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.
-  */
-  unsigned char image[1024];
-  Paint paint(image, 176, 24);    //width should be the multiple of 8
-
-  paint.Clear(UNCOLORED);
-  paint.DrawStringAt(0, 0, "e-Paper Demo", &Font16, COLORED);
-  epd.TransmitPartialData(paint.GetImage(), 16, 32, paint.GetWidth(), paint.GetHeight());
-
-  paint.Clear(COLORED);
-  paint.DrawStringAt(20, 5, "Hello world!", &Font16, UNCOLORED);
-  epd.TransmitPartialData(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.TransmitPartialData(paint.GetImage(), 10, 130, paint.GetWidth(), paint.GetHeight());
-
-  paint.Clear(UNCOLORED);
-  paint.DrawCircle(32, 32, 30, COLORED);
-  epd.TransmitPartialData(paint.GetImage(), 90, 120, paint.GetWidth(), paint.GetHeight());
-
-  paint.Clear(UNCOLORED);
-  paint.DrawFilledRectangle(0, 0, 40, 50, COLORED);
-  epd.TransmitPartialData(paint.GetImage(), 10, 200, paint.GetWidth(), paint.GetHeight());
-
-  paint.Clear(UNCOLORED);
-  paint.DrawFilledCircle(32, 32, 30, COLORED);
-  epd.TransmitPartialData(paint.GetImage(), 90, 190, paint.GetWidth(), paint.GetHeight());
-
-  /* This displays the data from the SRAM in e-Paper module */
-  Serial.print("show draw image\r\n");
-  epd.DisplayFrame();
-
-  /* Deep sleep */
-  Serial.print("sleep...");
-  epd.Sleep();
-}
-
-void loop() {
-  // put your main code here, to run repeatedly:
-
-}