/*****************************************************************************
* | File      	:   EPD_4in2.c
* | Author      :   Waveshare team
* | Function    :   4.2inch e-paper
* | Info        :
*----------------
* |	This version:   V3.0
* | Date        :   2019-06-13
* | Info        :
* -----------------------------------------------------------------------------
#
# 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 "EPD_4in2.h"

/******************************************************************************
function :	Software reset
parameter:
******************************************************************************/
static void EPD_4IN2_Reset(void)
{
    DEV_Digital_Write(EPD_RST_PIN, 1);
    DEV_Delay_ms(10);
    for (UBYTE i = 0; i < 3; i++)
    {
        DEV_Digital_Write(EPD_RST_PIN, 0);
        DEV_Delay_ms(10);
        DEV_Digital_Write(EPD_RST_PIN, 1);
        DEV_Delay_ms(10);
    }
}

/******************************************************************************
function :	send command
parameter:
     Reg : Command register
******************************************************************************/
void EPD_4IN2_SendCommand(UBYTE Reg)
{
    DEV_Digital_Write(EPD_DC_PIN, 0);
    DEV_Digital_Write(EPD_CS_PIN, 0);
    DEV_SPI_WriteByte(Reg);
    DEV_Digital_Write(EPD_CS_PIN, 1);
}

/******************************************************************************
function :	send data
parameter:
    Data : Write data
******************************************************************************/
void EPD_4IN2_SendData(UBYTE Data)
{
    DEV_Digital_Write(EPD_DC_PIN, 1);
    DEV_Digital_Write(EPD_CS_PIN, 0);
    DEV_SPI_WriteByte(Data);
    DEV_Digital_Write(EPD_CS_PIN, 1);
}

void EPD_4IN2_SendData2(UBYTE *Data, UBYTE Len)
{
    DEV_Digital_Write(EPD_DC_PIN, 1);
    DEV_Digital_Write(EPD_CS_PIN, 0);
    DEV_SPI_WriteBytes(Data, Len);
    DEV_Digital_Write(EPD_CS_PIN, 1);
}

/******************************************************************************
function :	Wait until the busy_pin goes LOW
parameter:
******************************************************************************/
void EPD_4IN2_ReadBusy(void)
{
    while(DEV_Digital_Read(EPD_BUSY_PIN) == 0) {      //LOW: idle, HIGH: busy
        DEV_Delay_ms(100);
    }
}

/******************************************************************************
function :	Turn On Display
parameter:
******************************************************************************/
void EPD_4IN2_TurnOnDisplay(void)
{
    EPD_4IN2_SendCommand(0x12);
    DEV_Delay_ms(100);
    EPD_4IN2_ReadBusy();
}

/******************************************************************************
function :	Initialize the e-Paper register
parameter:
******************************************************************************/
void EPD_4IN2_Init(void)
{
	EPD_4IN2_Reset();

	EPD_4IN2_SendCommand(0x04);         // POWER ON
	EPD_4IN2_ReadBusy();

	EPD_4IN2_SendCommand(0x00);			// panel setting
	EPD_4IN2_SendData(0x1f);		    // 400x300 B/W mode, LUT from OTP

	EPD_4IN2_SendCommand(0x61);			// resolution setting
	EPD_4IN2_SendData (EPD_4IN2_WIDTH / 256);
	EPD_4IN2_SendData (EPD_4IN2_WIDTH % 256);
	EPD_4IN2_SendData (EPD_4IN2_HEIGHT / 256);
	EPD_4IN2_SendData (EPD_4IN2_HEIGHT % 256);

	EPD_4IN2_SendCommand(0x50);         // VCOM AND DATA INTERVAL SETTING
	EPD_4IN2_SendData(0x97);            // LUTB=0 LUTW=1 interval=10
}

/******************************************************************************
function :	Clear screen
parameter:
******************************************************************************/
void EPD_4IN2_Clear(void)
{
    UWORD Width, Height;
    Width = (EPD_4IN2_WIDTH % 8 == 0)? (EPD_4IN2_WIDTH / 8 ): (EPD_4IN2_WIDTH / 8 + 1);
    Height = EPD_4IN2_HEIGHT;

    EPD_4IN2_SendCommand(0x10);
    for (UWORD j = 0; j < Height; j++) {
        for (UWORD i = 0; i < Width; i++) {
            EPD_4IN2_SendData(0xFF);
        }
    }

    EPD_4IN2_SendCommand(0x13);
    for (UWORD j = 0; j < Height; j++) {
        for (UWORD i = 0; i < Width; i++) {
            EPD_4IN2_SendData(0xFF);
        }
    }

    EPD_4IN2_TurnOnDisplay();
}

/******************************************************************************
function :	Sends the image buffer in RAM to e-Paper and displays
parameter:
******************************************************************************/
void EPD_4IN2_Display(UBYTE *Image)
{
    UWORD Width, Height;
    Width = (EPD_4IN2_WIDTH % 8 == 0)? (EPD_4IN2_WIDTH / 8 ): (EPD_4IN2_WIDTH / 8 + 1);
    Height = EPD_4IN2_HEIGHT;

	EPD_4IN2_SendCommand(0x10);
    for (UWORD j = 0; j < Height; j++) {
        for (UWORD i = 0; i < Width; i++) {
            EPD_4IN2_SendData(0x00);
        }
    }

    EPD_4IN2_SendCommand(0x13);
    for (UWORD j = 0; j < Height; j++) {
        for (UWORD i = 0; i < Width; i++) {
            EPD_4IN2_SendData(Image[i + j * Width]);
        }
    }

    EPD_4IN2_TurnOnDisplay();
}

/******************************************************************************
function :	Enter sleep mode
parameter:
******************************************************************************/
void EPD_4IN2_Sleep(void)
{
	EPD_4IN2_SendCommand(0x50); // DEEP_SLEEP
	EPD_4IN2_SendData(0XF7);

	EPD_4IN2_SendCommand(0x02); // POWER_OFF
	EPD_4IN2_ReadBusy();

	EPD_4IN2_SendCommand(0x07); // DEEP_SLEEP
	EPD_4IN2_SendData(0XA5);
}