text: /**
   *  @filename   :   epdif.h
   *  @brief      :   Header file of epdif.cpp providing EPD interface functions
   *                  Users have to implement all the functions in epdif.cpp
   *  @author     :   Yehui from Waveshare
   *
   *  Copyright (C) Waveshare     August 10 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.
   */
  
  #ifndef EPDIF_H
  #define EPDIF_H
  
  #include <Arduino.h>
  #include "mgos_config.h"
  #include "mgos_event.h"
  
  // Pin definition
  #define RST_PIN         mgos_sys_config_get_epd_rst_gpio()
  #define DC_PIN          mgos_sys_config_get_epd_dc_gpio()
  #define CS_PIN          mgos_sys_config_get_epd_cs_gpio()
  #define BUSY_PIN        mgos_sys_config_get_epd_busy_gpio()
  
  class EpdIf {
  public:
      EpdIf(void);
      ~EpdIf(void);
  
      static int  IfInit(void);
      static void DigitalWrite(int pin, int value); 
      static int  DigitalRead(int pin);
      static void DelayMs(unsigned int delaytime);
      static void SpiTransfer(unsigned char data);
      // static void WaitUntilIdle(void);
  };
  
  /*
   * These events are registered by the MGOS core.
   * Other events could be registered by the external libraries.
   */
  #define MGOS_EVENT_EPD MGOS_EVENT_BASE('E', 'P', 'D')
  
  /*
   * System mos events
   */
  enum mgos_event_epd {
    /*
     * Fired when the EPD starts the render cycle (upto 15 secs)
     * ev_data: NULL
     */
    MGOS_EVENT_BUSY = MGOS_EVENT_EPD,
  
    /*
     * Fired when the EPD has finished rendering.
     * ev_data: NULL
     */
    MGOS_EVENT_IDLE
  };
  
  #endif
  