#include "ili9341.h"

volatile uint16_t LCD_W=ILI9341_TFTWIDTH;
volatile uint16_t LCD_H=ILI9341_TFTHEIGHT;




void ili9341_hard_init(void)//init hardware
{
controlddr=0xFF;//output for reset
controlport |=(1<<rst);//pull high for normal operation
}


void ili9341_spi_init(void)//set spi speed and settings 
{
DDRB |=(1<<2)|(1<<3)|(1<<5);//CS,SS,MOSI,SCK as output(although SS will be unused throughout the program)
SPCR=(1<<SPE)|(1<<MSTR);//mode 0,fosc/4
SPSR |=(1<<SPI2X);//doubling spi speed.i.e final spi speed-fosc/2
controlport |=(1<<7);//cs off during startup
}


void ili9341_spi_send(unsigned char spi_data)//send spi data to display
{
SPDR=spi_data;//move data into spdr
while(!(SPSR & (1<<SPIF)));//wait till the transmission is finished
}


void ili9341_writecommand8(uint8_t com)//command write
{
controlport &=~((1<<dc)|(1<<cs));//dc and cs both low to send command
_delay_us(5);//little delay
ili9341_spi_send(com);
controlport |=(1<<cs);//pull high cs
}


void ili9341_writedata8(uint8_t data)//data write
{
controlport |=(1<<dc);//st dc high for data
_delay_us(1);//delay
controlport &=~(1<<cs);//set cs low for operation
ili9341_spi_send(data);
controlport |=(1<<cs);
}


void ili9341_setaddress(uint16_t x1,uint16_t y1,uint16_t x2,uint16_t y2)//set coordinate for print or other function
{
ili9341_writecommand8(0x2A);
ili9341_writedata8(x1>>8);
ili9341_writedata8(x1);
ili9341_writedata8(x2>>8);
ili9341_writedata8(x2);

ili9341_writecommand8(0x2B);
ili9341_writedata8(y1>>8);
ili9341_writedata8(y1);
ili9341_writedata8(y2);
ili9341_writedata8(y2);

ili9341_writecommand8(0x2C);//meory write
}


void ili9341_hard_reset(void)//hard reset display
{
controlport |=(1<<rst);//pull high if low previously
_delay_ms(200);
controlport &=~(1<<rst);//low for reset
_delay_ms(200);
controlport |=(1<<rst);//again pull high for normal operation
_delay_ms(200);
}


void ili9341_init(void)//set up display using predefined command sequence
{
ili9341_hard_init();
ili9341_spi_init();
ili9341_hard_reset();
ili9341_writecommand8(0x01);//soft reset
_delay_ms(1000);
//power control A
ili9341_writecommand8(0xCB);
ili9341_writedata8(0x39);
ili9341_writedata8(0x2C);
ili9341_writedata8(0x00);
ili9341_writedata8(0x34);
ili9341_writedata8(0x02);

//power control B
ili9341_writecommand8(0xCF);
ili9341_writedata8(0x00);
ili9341_writedata8(0xC1);
ili9341_writedata8(0x30);

//driver timing control A
ili9341_writecommand8(0xE8);
ili9341_writedata8(0x85);
ili9341_writedata8(0x00);
ili9341_writedata8(0x78);

//driver timing control B
ili9341_writecommand8(0xEA);
ili9341_writedata8(0x00);
ili9341_writedata8(0x00);

//power on sequence control
ili9341_writecommand8(0xED);
ili9341_writedata8(0x64);
ili9341_writedata8(0x03);
ili9341_writedata8(0x12);
ili9341_writedata8(0x81);

//pump ratio control
ili9341_writecommand8(0xF7);
ili9341_writedata8(0x20);

//power control,VRH[5:0]
ili9341_writecommand8(0xC0);
ili9341_writedata8(0x23);

//Power control,SAP[2:0];BT[3:0]
ili9341_writecommand8(0xC1);
ili9341_writedata8(0x10);

//vcm control
ili9341_writecommand8(0xC5);
ili9341_writedata8(0x3E);
ili9341_writedata8(0x28);

//vcm control 2
ili9341_writecommand8(0xC7);
ili9341_writedata8(0x86);

//memory access control
ili9341_writecommand8(0x36);
ili9341_writedata8(0x48);

//pixel format
ili9341_writecommand8(0x3A);
ili9341_writedata8(0x55);

//frameration control,normal mode full colours
ili9341_writecommand8(0xB1);
ili9341_writedata8(0x00);
ili9341_writedata8(0x18);

//display function control
ili9341_writecommand8(0xB6);
ili9341_writedata8(0x08);
ili9341_writedata8(0x82);
ili9341_writedata8(0x27);

//3gamma function disable
ili9341_writecommand8(0xF2);
ili9341_writedata8(0x00);

//gamma curve selected
ili9341_writecommand8(0x26);
ili9341_writedata8(0x01);

//set positive gamma correction
ili9341_writecommand8(0xE0);
ili9341_writedata8(0x0F);
ili9341_writedata8(0x31);
ili9341_writedata8(0x2B);
ili9341_writedata8(0x0C);
ili9341_writedata8(0x0E);
ili9341_writedata8(0x08);
ili9341_writedata8(0x4E);
ili9341_writedata8(0xF1);
ili9341_writedata8(0x37);
ili9341_writedata8(0x07);
ili9341_writedata8(0x10);
ili9341_writedata8(0x03);
ili9341_writedata8(0x0E);
ili9341_writedata8(0x09);
ili9341_writedata8(0x00);

//set negative gamma correction
ili9341_writecommand8(0xE1);
ili9341_writedata8(0x00);
ili9341_writedata8(0x0E);
ili9341_writedata8(0x14);
ili9341_writedata8(0x03);
ili9341_writedata8(0x11);
ili9341_writedata8(0x07);
ili9341_writedata8(0x31);
ili9341_writedata8(0xC1);
ili9341_writedata8(0x48);
ili9341_writedata8(0x08);
ili9341_writedata8(0x0F);
ili9341_writedata8(0x0C);
ili9341_writedata8(0x31);
ili9341_writedata8(0x36);
ili9341_writedata8(0x0F);

//exit sleep
ili9341_writecommand8(0x11);
_delay_ms(120);
//display on
ili9341_writecommand8(0x29);

}

//set colour for drawing
void ili9341_pushcolour(uint16_t colour)
{
ili9341_writedata8(colour>>8);
ili9341_writedata8(colour);
}


//clear lcd and fill with colour
void ili9341_clear(uint16_t colour)
{
uint16_t i,j;
ili9341_setaddress(0,0,LCD_W-1,LCD_H-1);

for(i=0;i<LCD_W;i++)
{
for(j=0;j<LCD_H;j++)
{
ili9341_pushcolour(colour);
}
}

}



//draw pixel
void ili9341_drawpixel(uint16_t x3,uint16_t y3,uint16_t colour1) //pixels will always be counted from right side.x is representing LCD width which will always be less tha 240.Y is representing LCD height which will always be less than 320
{
if((x3 < 0) ||(x3 >=LCD_W) || (y3 < 0) || (y3 >=LCD_H)) return;

ili9341_setaddress(x3,y3,x3+1,y3+1);

ili9341_pushcolour(colour1);
}


//draw vertical line
void ili9341_drawvline(uint16_t x,uint16_t y,uint16_t h,uint16_t colour)//basically we will see this line horizental if we see the display 320*240
{
if((x >=LCD_W) || (y >=LCD_H)) return;
if((y+h-1)>=LCD_H)
h=LCD_H-y;
ili9341_setaddress(x,y,x,y+h-1);
while(h--)
{
ili9341_pushcolour(colour);
}
}


//draw horizental line

void ili9341_drawhline(uint16_t x,uint16_t y,uint16_t w,uint16_t colour)
{
if((x >=LCD_W) || (y >=LCD_H)) return;
if((x+w-1)>=LCD_W)
w=LCD_W-x;
ili9341_setaddress(x,y,x+w-1,y);
while(w--)
{
ili9341_pushcolour(colour);
}
}
//draw simple rectangle
void ili9341_drawrect(uint16_t x,uint16_t y,uint16_t w,uint16_t h,uint16_t colour)
{
ili9341_drawhline(x,y,w,colour);
ili9341_drawhline(x,y+h-1,w,colour);
ili9341_drawvline(x,y,h,colour);
ili9341_drawvline(x+w-1,y,h,colour);
}

//draw colour filled rectangle
void ili9341_fillrect(uint16_t x,uint16_t y,uint16_t w,uint16_t h,uint16_t colour)
{
if((x >=LCD_W) || (y >=LCD_H)) return;
if((x+w-1)>=LCD_W)
w=LCD_W-x;
if((y+h-1)>=LCD_H)
h=LCD_H-y;

ili9341_setaddress(x, y, x+w-1, y+h-1);

for(y=h; y>0; y--) 
{
for(x=w; x>0; x--)
{
ili9341_pushcolour(colour);
}
}
}

//draw circle















//rotate screen at desired orientation
void ili9341_setRotation(uint8_t m) 
{
uint8_t rotation;
ili9341_writecommand8(0x36);
rotation=m%4;
switch (rotation) 
{
case 0:
ili9341_writedata8(0x40|0x08);
LCD_W = 240;
LCD_H = 320;
break;
case 1:
ili9341_writedata8(0x20|0x08);
LCD_W  = 320;
LCD_H = 240;
break;
case 2:
ili9341_writedata8(0x80|0x08);
LCD_W  = 240;
LCD_H = 320;
break;
case 3:
ili9341_writedata8(0x40|0x80|0x20|0x08);
LCD_W  = 320;
LCD_H = 240;
break;
}
}