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 "driver/gpio.h"
  #include "driver/spi_master.h"
  #include <esp_log.h>
  #include "esp_system.h"
  #include "freertos/FreeRTOS.h"
  #include "freertos/task.h"
  #include "soc/gpio_struct.h"
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  // Pin definition
  #define MISO_PIN GPIO_NUM_12
  #define MOSI_PIN GPIO_NUM_27
  #define CLK_PIN GPIO_NUM_26
  #define CS_PIN GPIO_NUM_25
  #define DC_PIN GPIO_NUM_33
  #define RST_PIN GPIO_NUM_32
  #define BUSY_PIN GPIO_NUM_35
  
  spi_device_handle_t spi;
  
  int ifinit(void);
  void digital_write(gpio_num_t pin, int value);
  int digital_read(gpio_num_t pin);
  void delay_ms(unsigned int delaytime);
  void spi_transfer(unsigned char data);
  
  #endif
  