/**
    @filename   :   epd5in83.h
    @brief      :   Header file for e-paper library epd5in83.cpp
    @author     :   MyMX from Waveshare

    Copyright (C) Waveshare     April 6 2018

   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 <stdlib.h>
#include "epd5in83.h"

Epd::~Epd() {
};

Epd::Epd() {
  reset_pin = RST_PIN;
  dc_pin = DC_PIN;
  cs_pin = CS_PIN;
  busy_pin = BUSY_PIN;
  width = EPD_WIDTH;
  height = EPD_HEIGHT;
};

int Epd::Init(void) {
  if (IfInit() != 0) {
    return -1;
  }
  Reset();

  SendCommand(POWER_SETTING);
  SendData(0x37);
  SendData(0x00);

  SendCommand(PANEL_SETTING);
  SendData(0xCF);
  SendData(0x08);

  SendCommand(BOOSTER_SOFT_START);
  SendData(0xc7);
  SendData(0xcc);
  SendData(0x28);

  SendCommand(POWER_ON);
  WaitUntilIdle();

  SendCommand(PLL_CONTROL);
  SendData(0x3c);

  SendCommand(TEMPERATURE_CALIBRATION);
  SendData(0x00);

  SendCommand(VCOM_AND_DATA_INTERVAL_SETTING);
  SendData(0x77);

  SendCommand(TCON_SETTING);
  SendData(0x22);

  SendCommand(TCON_RESOLUTION);
  SendData(width >> 8);     //source 640
  SendData(width & 0xff);
  SendData(height >> 8);     //gate 384
  SendData(height & 0xff);

  SendCommand(VCM_DC_SETTING);
  SendData(0x1E);      //decide by LUT file

  SendCommand(0xe5);           //FLASH MODE
  SendData(0x03);

  return 0;
}

/**
    @brief: basic function for sending commands
*/
void Epd::SendCommand(unsigned char command) {
  DigitalWrite(dc_pin, LOW);
  SpiTransfer(command);
}

/**
    @brief: basic function for sending data
*/
void Epd::SendData(unsigned char data) {
  DigitalWrite(dc_pin, HIGH);
  SpiTransfer(data);
}

/**
    @brief: Wait until the busy_pin goes HIGH
*/
void Epd::WaitUntilIdle(void) {
  while (DigitalRead(busy_pin) == 0) {     //0: busy, 1: idle
    DelayMs(100);
  }
}

/**
    @brief: module reset.
            often used to awaken the module in deep sleep,
            see Epd::Sleep();
*/
void Epd::Reset(void) {
  DigitalWrite(reset_pin, LOW);                //module reset
  DelayMs(200);
  DigitalWrite(reset_pin, HIGH);
  DelayMs(200);
}

void Epd::DisplayFrame(const unsigned char* frame_buffer) {
  unsigned char temp1, temp2;
  unsigned int n;
  SendCommand(DATA_START_TRANSMISSION_1);

  for (long i = 0; i <height / 2 ; i++) {
    for (long j = 0; j < 38; j++) {
          temp1 = pgm_read_byte(&frame_buffer[i * 38 + j] );
          for(unsigned char k = 0; k < 8; k++) {
              if(temp1 & 0x80)
                  temp2 = 0x03;
              else
                  temp2 = 0x00;
              
              temp2 <<= 4;
              temp1 <<= 1;
              k++;
              if(temp1 & 0x80)
                  temp2 |= 0x03;
              else
                  temp2 |= 0x00;
              temp1 <<= 1;
              if((j * 4 + k / 2) < 150){
                SendData(temp2); 
              }
          }
    }
    for (long j = 0; j < width / 4; j++) {
      SendData(0x33);
    }
  }
  for (long i = 0; i <height / 2 ; i++) {
    for (long j = 0; j < width / 4; j++) {
      SendData(0x33);
    }
    for (long j = 0; j < width / 4; j++) {
      SendData(0x00);
    }
  }
  SendCommand(DISPLAY_REFRESH);
  DelayMs(100);
  WaitUntilIdle();
}

/**
    @brief: After this command is transmitted, the chip would enter the
            deep-sleep mode to save power.
            The deep sleep mode would return to standby by hardware reset.
            The only one parameter is a check code, the command would be
            executed if check code = 0xA5.
            You can use EPD_Reset() to awaken
*/
void Epd::Sleep(void) {
  SendCommand(POWER_OFF);
  WaitUntilIdle();
  SendCommand(DEEP_SLEEP);
  SendData(0xa5);
}

/* END OF FILE */