/* Code rewritten from Adafruit Arduino library for the TFT
 *  by Syed Tahmid Mahbub
 * The TFT itself is Adafruit product 1480
 * Included below is the text header from the original Adafruit library
 *  followed by the code
 *
 */

/***************************************************
  This is an Arduino Library for the Adafruit 2.2" SPI display.
  This library works with the Adafruit 2.2" TFT Breakout w/SD card
  ----> http://www.adafruit.com/products/1480

  Check out the links above for our tutorials and wiring diagrams
  These displays use SPI to communicate, 4 or 5 pins are required to
  interface (RST is optional)
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.
  MIT license, all text above must be included in any redistribution
 ****************************************************/

#include "plib.h"
#include "tft_master.h"
#include <xc.h>

inline void Mode16(void){  // configure SPI1 for 16-bit mode
    SPI1CONSET = 0x400;
}

inline void Mode8(void){  // configure SPI1 for 8-bit mode
    SPI1CONCLR = 0x400;
}

void tft_init_hw(void) {
  _width = ILI9340_TFTWIDTH;
  _height = ILI9340_TFTHEIGHT;
  //RPB11R = 3
  RPA1R = 3;;               // SDO pin for SPI - goes to MOSI on TFT
  //SDI1R = 0; // RA1       // I won't be reading from TFT
}

void tft_spiwrite(unsigned char c){ // Transfer to SPI
    while (TxBufFullSPI1());
    WriteSPI1(c);
    while (SPI1STATbits.SPIBUSY); // wait for it to end of transaction
}

void tft_spiwrite8(unsigned char c) {   // Transfer one byte c to SPI
 /* The default mode for me is to transfer 16-bits at once
  * However, it is necessary sometimes to transfer only 8-bits at a time
  * But this is required less often than 16-bits at once
  * So, the default mode is 16-bit mode and is switched to 8-bit mode when
  *     required, and then switched back at the end of the function
  */
    Mode8(); // switch to 8-bit mode
    while (TxBufFullSPI1());
    WriteSPI1(c);
    while (SPI1STATbits.SPIBUSY); // wait for it to end of transaction
    Mode16(); // switch back to 16-bit mode
}

void tft_spiwrite16(unsigned short c){  // Transfer two bytes "c" to SPI
    while (TxBufFullSPI1());
    WriteSPI1(c);
    while (SPI1STATbits.SPIBUSY); // wait for it to end of transaction
}


void tft_writecommand(unsigned char c) {
    _dc_low();
    _cs_low();

    tft_spiwrite8(c);

    _cs_high();

}

void tft_writecommand16(unsigned short c) {
    _dc_low();
    _cs_low();

    tft_spiwrite16(c);

    _cs_high();

}


void tft_writedata(unsigned char c) {
    _dc_high();
    _cs_low();

    tft_spiwrite8(c);

    _cs_high();

}

void tft_writedata16(unsigned short c) {
    _dc_high();
    _cs_low();

    tft_spiwrite16(c);

    _cs_high();

}

// Rather than a bazillion writecommand() and writedata() calls, screen
// initialization commands and arguments are organized in these tables
// stored in PROGMEM.  The table may look bulky, but that's mostly the
// formatting -- storage-wise this is hundreds of bytes more compact
// than the equivalent code.  Companion function follows.
#define DELAY 0x80

void tft_begin(void) {

  TRIS_rst = 0;
  _rst_low();
  TRIS_dc = 0;
  TRIS_cs = 0;

  _dc_low();
  _cs_high();

    SpiChnOpen(1, SPI_OPEN_MSTEN | SPI_OPEN_MODE8 | SPI_OPEN_ON |
        SPI_OPEN_DISSDI | SPI_OPEN_CKE_REV , PBCLK/SPI_freq ); //PBCLK/SPI_freq);

    // Start with 8-bit mode for initialization - move to 16-bit mode once
    // that's done

  _rst_high();
  delay_ms(5);
  _rst_low();
  delay_ms(20);
  _rst_high();
  delay_ms(150);

  tft_writecommand(0xEF);
  tft_writedata(0x03);
  tft_writedata(0x80);
  tft_writedata(0x02);

  tft_writecommand(0xCF);
  tft_writedata(0x00);
  tft_writedata(0xC1);
  tft_writedata(0x30);

  tft_writecommand(0xED);
  tft_writedata(0x64);
  tft_writedata(0x03);
  tft_writedata(0x12);
  tft_writedata(0x81);

  tft_writecommand(0xE8);
  tft_writedata(0x85);
  tft_writedata(0x00);
  tft_writedata(0x78);

  tft_writecommand(0xCB);
  tft_writedata(0x39);
  tft_writedata(0x2C);
  tft_writedata(0x00);
  tft_writedata(0x34);
  tft_writedata(0x02);

  tft_writecommand(0xF7);
  tft_writedata(0x20);

  tft_writecommand(0xEA);
  tft_writedata(0x00);
  tft_writedata(0x00);

  tft_writecommand(ILI9340_PWCTR1);    //Power control
  tft_writedata(0x23);   //VRH[5:0]

  tft_writecommand(ILI9340_PWCTR2);    //Power control
  tft_writedata(0x10);   //SAP[2:0];BT[3:0]

  tft_writecommand(ILI9340_VMCTR1);    //VCM control
  tft_writedata(0x3e);
  tft_writedata(0x28);

  tft_writecommand(ILI9340_VMCTR2);    //VCM control2
  tft_writedata(0x86);

  tft_writecommand(ILI9340_MADCTL);    // Memory Access Control
  tft_writedata(ILI9340_MADCTL_MX | ILI9340_MADCTL_BGR);

  tft_writecommand(ILI9340_PIXFMT);
  tft_writedata(0x55);

  tft_writecommand(ILI9340_FRMCTR1);
  tft_writedata(0x00);
  tft_writedata(0x18);

  tft_writecommand(ILI9340_DFUNCTR);    // Display Function Control
  tft_writedata(0x08);
  tft_writedata(0x82);
  tft_writedata(0x27);

  tft_writecommand(0xF2);    // 3Gamma Function Disable
  tft_writedata(0x00);

  tft_writecommand(ILI9340_GAMMASET);    //Gamma curve selected
  tft_writedata(0x01);

  tft_writecommand(ILI9340_GMCTRP1);    //Set Gamma
  tft_writedata(0x0F);
  tft_writedata(0x31);
  tft_writedata(0x2B);
  tft_writedata(0x0C);
  tft_writedata(0x0E);
  tft_writedata(0x08);
  tft_writedata(0x4E);
  tft_writedata(0xF1);
  tft_writedata(0x37);
  tft_writedata(0x07);
  tft_writedata(0x10);
  tft_writedata(0x03);
  tft_writedata(0x0E);
  tft_writedata(0x09);
  tft_writedata(0x00);

  tft_writecommand(ILI9340_GMCTRN1);    //Set Gamma
  tft_writedata(0x00);
  tft_writedata(0x0E);
  tft_writedata(0x14);
  tft_writedata(0x03);
  tft_writedata(0x11);
  tft_writedata(0x07);
  tft_writedata(0x31);
  tft_writedata(0xC1);
  tft_writedata(0x48);
  tft_writedata(0x08);
  tft_writedata(0x0F);
  tft_writedata(0x0C);
  tft_writedata(0x31);
  tft_writedata(0x36);
  tft_writedata(0x0F);

  tft_writecommand(ILI9340_SLPOUT);    //Exit Sleep
  delay_ms(120);
  tft_writecommand(ILI9340_DISPON);    //Display on

  // Now move to 16-bit mode to speed things up for display
  Mode16();
}


void tft_setAddrWindow(unsigned short x0, unsigned short y0, unsigned short x1, unsigned short y1) {

  tft_writecommand(ILI9340_CASET); // Column addr set
  tft_writedata16(x0);
  tft_writedata16(x1);

  tft_writecommand(ILI9340_PASET); // Row addr set
  tft_writedata16(y0);
  tft_writedata16(y1);

  tft_writecommand(ILI9340_RAMWR); // write to RAM
}


void tft_pushColor(unsigned short color) {
  _dc_high();
  _cs_low();

  tft_spiwrite16(color);

  _cs_high();
}
#define NOP asm("nop");
#define wait16 NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;
#define wait8 NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;
#define wait12 NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;
#define wait15 NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;

void tft_drawPixel(short x, short y, unsigned short color) {
/* Draw a pixel at location (x,y) with given color
 * Parameters:
 *      x:  x-coordinate of pixel to draw; top left of screen is x=0
 *              and x increases to the right
 *      y:  y-coordinate of pixel to draw; top left of screen is y=0
 *              and y increases to the bottom
 *      color:  16-bit color value
 * Returns:     Nothing
 */

  if((x < 0) ||(x >= _width) || (y < 0) || (y >= _height)) return;
/*
  tft_setAddrWindow(x,y,x+1,y+1);

  _dc_high();
  _cs_low();

  tft_spiwrite16(color);

  _cs_high();
}
*/
  //tft_writecommand(ILI9340_CASET); // Column addr set
   _dc_low();
    _cs_low();
    //tft_spiwrite8(ILI9340_CASET);
    Mode8(); // switch to 8-bit mode
    while (TxBufFullSPI1());
    WriteSPI1(ILI9340_CASET);
    //while (SPI1STATbits.SPIBUSY); // wait for it to end of transaction
    wait16;
    Mode16(); // switch back to 16-bit mode
    _cs_high();

  //tft_writedata16(x);
   _dc_high();
    _cs_low();
    //tft_spiwrite16(c);
   // while (TxBufFullSPI1());
    WriteSPI1(x);
    //while (SPI1STATbits.SPIBUSY);
    wait16;wait16;wait8;
    _cs_high();

    
  //tft_writedata16(x+1);
  // _dc_high();
    _cs_low();
    //tft_spiwrite16(c);
    //while (TxBufFullSPI1());
    WriteSPI1(x+1);
    //while (SPI1STATbits.SPIBUSY);
    wait16;wait16;wait8;
    _cs_high();

  //t_writecommand(ILI9340_PASET); // Row addr set
  _dc_low();
    _cs_low();
    //tft_spiwrite8(ILI9340_PASET);
    Mode8(); // switch to 8-bit mode
    //while (TxBufFullSPI1());
    WriteSPI1(ILI9340_PASET);
    //while (SPI1STATbits.SPIBUSY); // wait for it to end of transaction
    wait16;wait8;
    Mode16(); // switch back to 16-bit mode
    _cs_high();

  //tft_writedata16(y);
   _dc_high();
    _cs_low();
    //tft_spiwrite16(c);
   // while (TxBufFullSPI1());
    WriteSPI1(y);
   // while (SPI1STATbits.SPIBUSY);
    wait16;wait16;wait8;
    _cs_high();

    
  //tft_writedata16(y+1);
   //_dc_high();
    _cs_low();
    //tft_spiwrite16(c);
    //while (TxBufFullSPI1());
    WriteSPI1(y+1);
    //while (SPI1STATbits.SPIBUSY);
    wait16;wait16;wait8;
    _cs_high();

  //tft_writecommand(ILI9340_RAMWR); // write to RAM
    _dc_low();
    _cs_low();
    //tft_spiwrite8(ILI9340_RAMWR);
    Mode8(); // switch to 8-bit mode
   // while (TxBufFullSPI1());
    WriteSPI1(ILI9340_RAMWR);
   // while (SPI1STATbits.SPIBUSY); // wait for it to end of transaction
    wait16;wait8;
    Mode16(); // switch back to 16-bit mode
    _cs_high();

  _dc_high();
  _cs_low();
  //tft_spiwrite16(color);
 // while (TxBufFullSPI1());
    WriteSPI1(color);
    //while (SPI1STATbits.SPIBUSY);
    wait16;wait16;wait8;
  _cs_high();
}

void tft_drawFastVLine(short x, short y, short h, unsigned short color) {
/* Draw a vertical line at location from (x,y) to (x,y+h-1) with color
 * Parameters:
 *      x:  x-coordinate line to draw; top left of screen is x=0
 *              and x increases to the right
 *      y:  y-coordinate of starting point of line; top left of screen is y=0
 *              and y increases to the bottom
 *      h:  height of line to draw
 *      color:  16-bit color value
 * Returns:     Nothing
 */

  // Rudimentary clipping
  if((x >= _width) || (y >= _height)) return;

  if((y+h-1) >= _height)
    h = _height-y;

  tft_setAddrWindow(x, y, x, y+h-1);

  _dc_high();
  _cs_low();

  while (h--) {
      tft_spiwrite16(color);
  }

  _cs_high();
}


void tft_drawFastHLine(short x, short y, short w, unsigned short color) {
/* Draw a horizontal line at location from (x,y) to (x+w-1,y) with color
 * Parameters:
 *      x:  x-coordinate starting point of line; top left of screen is x=0
 *              and x increases to the right
 *      y:  y-coordinate of starting point of line; top left of screen is y=0
 *              and y increases to the bottom
 *      w:  width of line to draw
 *      color:  16-bit color value
 * Returns:     Nothing
 */

  // Rudimentary clipping
  if((x >= _width) || (y >= _height)) return;
  if((x+w-1) >= _width)  w = _width-x;
  tft_setAddrWindow(x, y, x+w-1, y);

  _dc_high();
  _cs_low();

  while (w--) {
      tft_spiwrite16(color);
  }

  _cs_high();
}

void tft_fillScreen(unsigned short color) {
/* Fill entire screen with given color
 * Parameters:
 *      color: 16-bit color value
 * Returs:  Nothing
 */
    tft_fillRect(0, 0,  _width, _height, color);
}

// fill a rectangle
void tft_fillRect(short x, short y, short w, short h,
  unsigned short color) {
/* Draw a filled rectangle with starting top-left vertex (x,y),
 *  width w and height h with given color
 * Parameters:
 *      x:  x-coordinate of top-left vertex; top left of screen is x=0
 *              and x increases to the right
 *      y:  y-coordinate of top-left vertex; top left of screen is y=0
 *              and y increases to the bottom
 *      w:  width of rectangle
 *      h:  height of rectangle
 *      color:  16-bit color value
 * Returns:     Nothing
 */

  // rudimentary clipping (drawChar w/big text requires this)
  if((x >= _width) || (y >= _height)) return;
  if((x + w - 1) >= _width)  w = _width  - x;
  if((y + h - 1) >= _height) h = _height - y;

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

  _dc_high();
  _cs_low();

  for(y=h; y>0; y--) {
    for(x=w; x>0; x--) {
        tft_spiwrite16(color);
    }
  }

  _cs_high();
}

inline unsigned short tft_Color565(unsigned char r, unsigned char g, unsigned char b) {
/* Pass 8-bit (each) R,G,B, get back 16-bit packed color
 * Parameters:
 *      r:  8-bit R/red value from RGB
 *      g:  8-bit g/green value from RGB
 *      b:  8-bit b/blue value from RGB
 * Returns:
 *      16-bit packed color value for color info
 */
  return ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3);
}


void tft_setRotation(unsigned char m) {
  unsigned char rotation;
  tft_writecommand(ILI9340_MADCTL);
  rotation = m % 4; // can't be higher than 3
  switch (rotation) {
   case 0:
     tft_writedata(ILI9340_MADCTL_MX | ILI9340_MADCTL_BGR);
     _width  = ILI9340_TFTWIDTH;
     _height = ILI9340_TFTHEIGHT;
     break;
   case 1:
     tft_writedata(ILI9340_MADCTL_MV | ILI9340_MADCTL_BGR);
     _width  = ILI9340_TFTHEIGHT;
     _height = ILI9340_TFTWIDTH;
     break;
  case 2:
    tft_writedata(ILI9340_MADCTL_MY | ILI9340_MADCTL_BGR);
     _width  = ILI9340_TFTWIDTH;
     _height = ILI9340_TFTHEIGHT;
    break;
   case 3:
     tft_writedata(ILI9340_MADCTL_MV | ILI9340_MADCTL_MY | ILI9340_MADCTL_MX | ILI9340_MADCTL_BGR);
     _width  = ILI9340_TFTHEIGHT;
     _height = ILI9340_TFTWIDTH;
     break;
  }
}

void delay_ms(unsigned long i){
/* Create a software delay about i ms long
 * Parameters:
 *      i:  equal to number of milliseconds for delay
 * Returns: Nothing
 * Note: Uses Core Timer. Core Timer is cleared at the initialiazion of
 *      this function. So, applications sensitive to the Core Timer are going
 *      to be affected
 */
    unsigned int j;
    j = dTime_ms * i;
    WriteCoreTimer(0);
    while (ReadCoreTimer() < j);
}

void delay_us(unsigned long i){
/* Create a software delay about i us long
 * Parameters:
 *      i:  equal to number of microseconds for delay
 * Returns: Nothing
 * Note: Uses Core Timer. Core Timer is cleared at the initialiazion of
 *      this function. So, applications sensitive to the Core Timer are going
 *      to be affected
 */
    unsigned int j;
    j = dTime_us * i;
    WriteCoreTimer(0);
    while (ReadCoreTimer() < j);
}

//void tft_invertDisplay(boolean i) {
//  writecommand(i ? ILI9340_INVON : ILI9340_INVOFF);
//}


////////// stuff not actively being used, but kept for posterity


//unsigned char tft_spiread(void) {
//  unsigned char r = 0;
//
//  /*
//   * ADD SPI INTERFACE CODE -----------------------------------------------&**************************
//  */
//  //Serial.print("read: 0x"); Serial.print(r, HEX);
//
//  return r;
//}

// unsigned char tft_readdata(void) {
//   unsigned char r;
//   _dc_high();
//   _cs_low();
//   r = tft_spiread();
//   _cs_high();
//   return r;
//
//}
//
//
// unsigned char tft_readcommand8(unsigned char c) {
//     _dc_low();
////     _sclk = 0;
//     _cs_low();
//     tft_spiwrite8(c);
//
//     _dc_high();
//     unsigned char r = tft_spiread();
//     _cs_high();
//     return r;
//
//   /*
//   digitalWrite(_dc, LOW);
//   digitalWrite(_sclk, LOW);
//   digitalWrite(_cs, LOW);
//   spiwrite(c);
//
//   digitalWrite(_dc, HIGH);
//   unsigned char r = spiread();
//   digitalWrite(_cs, HIGH);
//   return r;
//    */
//}