e-paper-display/bcm2835-1.71/e-Paper/Arduino/epd2in9b_V3/epd2in9b_V3.cpp

/**
 *  @filename   :   epd2in9b_V3.cpp
 *  @brief      :   Implements for e-paper library
 *  @author     :   Waveshare
 *
 *  Copyright (C) Waveshare     Dec 3 2020
 *
 * 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 "epd2in9b_V3.h"
#include "imagedata.h"

Epd::~Epd() {
};

Epd::Epd() {
    reset_pin = RST_PIN;
    dc_pin = DC_PIN;
    cs_pin = CS_PIN;
    busy_pin = BUSY_PIN;
    width = EPD_WIDTH / 8;
    height = EPD_HEIGHT;
};

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

    SendCommand(0x04);//power on
    WaitUntilIdle();//waiting for the electronic paper IC to release the idle signal

    SendCommand(0x00);//panel setting
    SendData(0x0f);//default data
    SendData(0x89);//128x296,Temperature sensor, boost and other related timing settings

    SendCommand(0x61);//Display resolution setting
    SendData (0x80);
    SendData (0x01);
    SendData (0x28);

    SendCommand(0X50);//VCOM AND DATA INTERVAL SETTING      
    SendData(0x77);//WBmode:VBDF 17|D7 VBDW 97 VBDB 57   
                            //WBRmode:VBDF F7 VBDW 77 VBDB 37  VBDR B7
    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) {
  unsigned char busy;
  Serial.print("e-Paper busy \r\n ");
  do
  {
 //   SendCommand(0x71);
    busy = DigitalRead(busy_pin);
    busy =!(busy & 0x01);        
  }
  while(busy); 
  Serial.print("e-Paper busy release \r\n ");
  DelayMs(200);
}

/**
 *  @brief: module reset.
 *          often used to awaken the module in deep sleep,
 *          see Epd::Sleep();
 */
void Epd::Reset(void) {
    DigitalWrite(reset_pin, HIGH);
    DelayMs(200);   
    DigitalWrite(reset_pin, LOW);                //module reset    
    DelayMs(2);
    DigitalWrite(reset_pin, HIGH);
    DelayMs(200);    
}

void Epd::DisplayFrame(const UBYTE *blackimage, const UBYTE *ryimage) {
    SendCommand(0x10);
    for (UWORD j = 0; j < height; j++) {
        for (UWORD i = 0; i < width; i++) {
          SendData(pgm_read_byte(&blackimage[i + (j*width)]));
        }
    }
    SendCommand(0x92);
    
    SendCommand(0x13);
    for (UWORD j = 0; j < height; j++) {
        for (UWORD i = 0; i < width; i++) {
          SendData(pgm_read_byte(&ryimage[i + (j*width)]));
        }
    }
    SendCommand(0x92);

    SendCommand(0x12);
    WaitUntilIdle();
}

void Epd::Clear(void) {
    //send black data
    SendCommand(0x10);
    for (UWORD j = 0; j < height; j++) {
        for (UWORD i = 0; i < width; i++) {
            SendData(0xff);
        }
    }

    //send red data
    SendCommand(0x13);
    for (UWORD j = 0; j < height; j++) {
        for (UWORD i = 0; i < width; i++) {
            SendData(0xff);
        }
    }
    
    SendCommand(0x12);
    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
 *          You can use EPD_Reset() to awaken
 */
void Epd::Sleep(void) {
    SendCommand(0x02); // POWER_OFF
    WaitUntilIdle();
    SendCommand(0x07); // DEEP_SLEEP
    SendData(0xA5); // check code
}



/* END OF FILE */