ILI9488.cpp

/***************************************************
  STM32 Support added by Jaret Burkett at OSHlab.com

  This is our library for the Adafruit ILI9488 Breakout and Shield
  ----> http://www.adafruit.com/products/1651

  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 "ILI9488.h"
#ifdef __AVR
  #include <avr/pgmspace.h>
#elif defined(ESP8266)
  #include <pgmspace.h>
#endif

#ifndef ARDUINO_STM32_FEATHER
  #include "pins_arduino.h"
  #include "wiring_private.h"
#endif

#include <limits.h>
#include <SPI.h>


// If the SPI library has transaction support, these functions
// establish settings and protect from interference from other
// libraries.  Otherwise, they simply do nothing.
#ifdef SPI_HAS_TRANSACTION
static inline void spi_begin(void) __attribute__((always_inline));
static inline void spi_begin(void) {
#if defined (ARDUINO_ARCH_ARC32)
  // max speed!
  SPI.beginTransaction(SPISettings(16000000, MSBFIRST, SPI_MODE0));
#else
    // max speed!
  SPI.beginTransaction(SPISettings(24000000, MSBFIRST, SPI_MODE0));
#endif
}
static inline void spi_end(void) __attribute__((always_inline));
static inline void spi_end(void) {
  SPI.endTransaction();
}
#else
#define spi_begin()
#define spi_end()
#endif


// Constructor when using software SPI.  All output pins are configurable.
ILI9488::ILI9488(int8_t cs, int8_t dc, int8_t mosi,
				   int8_t sclk, int8_t rst, int8_t miso) : Adafruit_GFX(ILI9488_TFTWIDTH, ILI9488_TFTHEIGHT) {
  _cs   = cs;
  _dc   = dc;
  _mosi  = mosi;
  _miso = miso;
  _sclk = sclk;
  _rst  = rst;
  hwSPI = false;
}


// Constructor when using hardware SPI.  Faster, but must use SPI pins
// specific to each board type (e.g. 11,13 for Uno, 51,52 for Mega, etc.)
ILI9488::ILI9488(int8_t cs, int8_t dc, int8_t rst) : Adafruit_GFX(ILI9488_TFTWIDTH, ILI9488_TFTHEIGHT) {
  _cs   = cs;
  _dc   = dc;
  _rst  = rst;
  hwSPI = true;
  _mosi  = _sclk = 0;
}

void ILI9488::spiwrite(uint8_t c) {

  //Serial.print("0x"); Serial.print(c, HEX); Serial.print(", ");

  if (hwSPI) {
#if defined (__AVR__)
  #ifndef SPI_HAS_TRANSACTION
    uint8_t backupSPCR = SPCR;
    SPCR = mySPCR;
  #endif
    SPDR = c;
    while(!(SPSR & _BV(SPIF)));
  #ifndef SPI_HAS_TRANSACTION
    SPCR = backupSPCR;
  #endif
#else
    SPI.transfer(c);
#endif
  } else {
#if defined(ESP8266) || defined (ARDUINO_ARCH_ARC32)
    for(uint8_t bit = 0x80; bit; bit >>= 1) {
      if(c & bit) {
	digitalWrite(_mosi, HIGH);
      } else {
	digitalWrite(_mosi, LOW);
      }
      digitalWrite(_sclk, HIGH);
      digitalWrite(_sclk, LOW);
    }
#else
    // Fast SPI bitbang swiped from LPD8806 library
    for(uint8_t bit = 0x80; bit; bit >>= 1) {
      if(c & bit) {
	//digitalWrite(_mosi, HIGH);
	*mosiport |=  mosipinmask;
      } else {
	//digitalWrite(_mosi, LOW);
	*mosiport &= ~mosipinmask;
      }
      //digitalWrite(_sclk, HIGH);
      *clkport |=  clkpinmask;
      //digitalWrite(_sclk, LOW);
      *clkport &= ~clkpinmask;
    }
#endif
  }
}


void ILI9488::writecommand(uint8_t c) {
#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  *dcport &= ~dcpinmask;
  *csport &= ~cspinmask;
#else
  digitalWrite(_dc, LOW);
  digitalWrite(_sclk, LOW);
  digitalWrite(_cs, LOW);
#endif

  spiwrite(c);

#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  *csport |= cspinmask;
#else
  digitalWrite(_cs, HIGH);
#endif
}


void ILI9488::writedata(uint8_t c) {
#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  *dcport |=  dcpinmask;
  *csport &= ~cspinmask;
#else
  digitalWrite(_dc, HIGH);
  digitalWrite(_cs, LOW);
#endif

  spiwrite(c);

#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  *csport |= cspinmask;
#else
  digitalWrite(_cs, HIGH);
#endif
}


// 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


// Companion code to the above tables.  Reads and issues
// a series of LCD commands stored in PROGMEM byte array.
void ILI9488::commandList(uint8_t *addr) {

  uint8_t  numCommands, numArgs;
  uint16_t ms;

  numCommands = pgm_read_byte(addr++);   // Number of commands to follow
  while(numCommands--) {                 // For each command...
    writecommand(pgm_read_byte(addr++)); //   Read, issue command
    numArgs  = pgm_read_byte(addr++);    //   Number of args to follow
    ms       = numArgs & DELAY;          //   If hibit set, delay follows args
    numArgs &= ~DELAY;                   //   Mask out delay bit
    while(numArgs--) {                   //   For each argument...
      writedata(pgm_read_byte(addr++));  //     Read, issue argument
    }

    if(ms) {
      ms = pgm_read_byte(addr++); // Read post-command delay time (ms)
      if(ms == 255) ms = 500;     // If 255, delay for 500 ms
      delay(ms);
    }
  }
}


void ILI9488::begin(void) {
  if (_rst > 0) {
    pinMode(_rst, OUTPUT);
    digitalWrite(_rst, LOW);
  }

  pinMode(_dc, OUTPUT);
  pinMode(_cs, OUTPUT);

#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  csport    = portOutputRegister(digitalPinToPort(_cs));
  cspinmask = digitalPinToBitMask(_cs);
  dcport    = portOutputRegister(digitalPinToPort(_dc));
  dcpinmask = digitalPinToBitMask(_dc);
#endif

  if(hwSPI) { // Using hardware SPI
    SPI.begin();

#ifndef SPI_HAS_TRANSACTION
    SPI.setBitOrder(MSBFIRST);
    SPI.setDataMode(SPI_MODE0);
  #if defined (_AVR__)
    SPI.setClockDivider(SPI_CLOCK_DIV2); // 8 MHz (full! speed!)
    mySPCR = SPCR;
  #elif defined(TEENSYDUINO) || defined (__STM32F1__)
    SPI.setClockDivider(SPI_CLOCK_DIV2); // 8 MHz (full! speed!)
  #elif defined (__arm__)
    SPI.setClockDivider(11); // 8-ish MHz (full! speed!)
  #endif
#endif
  } else {
    pinMode(_sclk, OUTPUT);
    pinMode(_mosi, OUTPUT);
    pinMode(_miso, INPUT);

#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
    clkport     = portOutputRegister(digitalPinToPort(_sclk));
    clkpinmask  = digitalPinToBitMask(_sclk);
    mosiport    = portOutputRegister(digitalPinToPort(_mosi));
    mosipinmask = digitalPinToBitMask(_mosi);
    *clkport   &= ~clkpinmask;
    *mosiport  &= ~mosipinmask;
#endif
  }

  // toggle RST low to reset
  if (_rst > 0) {
    digitalWrite(_rst, HIGH);
    delay(5);
    digitalWrite(_rst, LOW);
    delay(20);
    digitalWrite(_rst, HIGH);
    delay(150);
  }

  /*
  uint8_t x = readcommand8(ILI9488_RDMODE);
  Serial.print("\nDisplay Power Mode: 0x"); Serial.println(x, HEX);
  x = readcommand8(ILI9488_RDMADCTL);
  Serial.print("\nMADCTL Mode: 0x"); Serial.println(x, HEX);
  x = readcommand8(ILI9488_RDPIXFMT);
  Serial.print("\nPixel Format: 0x"); Serial.println(x, HEX);
  x = readcommand8(ILI9488_RDIMGFMT);
  Serial.print("\nImage Format: 0x"); Serial.println(x, HEX);
  x = readcommand8(ILI9488_RDSELFDIAG);
  Serial.print("\nSelf Diagnostic: 0x"); Serial.println(x, HEX);
*/
  //if(cmdList) commandList(cmdList);

  if (hwSPI) spi_begin();
  // writecommand(0xEF);
  // writedata(0x03);
  // writedata(0x80);
  // writedata(0x02);
  //
  // writecommand(0xCF);
  // writedata(0x00);
  // writedata(0XC1);
  // writedata(0X30);
  //
  // writecommand(0xED);
  // writedata(0x64);
  // writedata(0x03);
  // writedata(0X12);
  // writedata(0X81);
  //
  // writecommand(0xE8);
  // writedata(0x85);
  // writedata(0x00);
  // writedata(0x78);
  //
  // writecommand(0xCB);
  // writedata(0x39);
  // writedata(0x2C);
  // writedata(0x00);
  // writedata(0x34);
  // writedata(0x02);
  //
  // writecommand(0xF7);
  // writedata(0x20);
  //
  // writecommand(0xEA);
  // writedata(0x00);
  // writedata(0x00);
  //
  // writecommand(ILI9488_PWCTR1);    //Power control
  // writedata(0x23);   //VRH[5:0]
  //
  // writecommand(ILI9488_PWCTR2);    //Power control
  // writedata(0x10);   //SAP[2:0];BT[3:0]
  //
  // writecommand(ILI9488_VMCTR1);    //VCM control
  // writedata(0x3e); //¶Ô±È¶Èµ÷½Ú
  // writedata(0x28);
  //
  // writecommand(ILI9488_VMCTR2);    //VCM control2
  // writedata(0x86);  //--
  //
  // writecommand(ILI9488_MADCTL);    // Memory Access Control
  // writedata(0x48);
  //
  // writecommand(ILI9488_PIXFMT);
  // writedata(0x55);
  //
  // writecommand(ILI9488_FRMCTR1);
  // writedata(0x00);
  // writedata(0x18);
  //
  // writecommand(ILI9488_DFUNCTR);    // Display Function Control
  // writedata(0x08);
  // writedata(0x82);
  // writedata(0x27);
  //
  // writecommand(0xF2);    // 3Gamma Function Disable
  // writedata(0x00);
  //
  // writecommand(ILI9488_GAMMASET);    //Gamma curve selected
  // writedata(0x01);
  //
  // writecommand(ILI9488_GMCTRP1);    //Set Gamma
  // writedata(0x0F);
  // writedata(0x31);
  // writedata(0x2B);
  // writedata(0x0C);
  // writedata(0x0E);
  // writedata(0x08);
  // writedata(0x4E);
  // writedata(0xF1);
  // writedata(0x37);
  // writedata(0x07);
  // writedata(0x10);
  // writedata(0x03);
  // writedata(0x0E);
  // writedata(0x09);
  // writedata(0x00);
  //
  // writecommand(ILI9488_GMCTRN1);    //Set Gamma
  // writedata(0x00);
  // writedata(0x0E);
  // writedata(0x14);
  // writedata(0x03);
  // writedata(0x11);
  // writedata(0x07);
  // writedata(0x31);
  // writedata(0xC1);
  // writedata(0x48);
  // writedata(0x08);
  // writedata(0x0F);
  // writedata(0x0C);
  // writedata(0x31);
  // writedata(0x36);
  // writedata(0x0F);


  writecommand(0xE0);
	writedata(0x00);
	writedata(0x03);
	writedata(0x09);
	writedata(0x08);
	writedata(0x16);
	writedata(0x0A);
	writedata(0x3F);
	writedata(0x78);
	writedata(0x4C);
	writedata(0x09);
	writedata(0x0A);
	writedata(0x08);
	writedata(0x16);
	writedata(0x1A);
	writedata(0x0F);


	writecommand(0XE1);
	writedata(0x00);
	writedata(0x16);
	writedata(0x19);
	writedata(0x03);
	writedata(0x0F);
	writedata(0x05);
	writedata(0x32);
	writedata(0x45);
	writedata(0x46);
	writedata(0x04);
	writedata(0x0E);
	writedata(0x0D);
	writedata(0x35);
	writedata(0x37);
	writedata(0x0F);



	writecommand(0XC0);      //Power Control 1
	writedata(0x17);    //Vreg1out
	writedata(0x15);    //Verg2out

	writecommand(0xC1);      //Power Control 2
	writedata(0x41);    //VGH,VGL

	writecommand(0xC5);      //Power Control 3
	writedata(0x00);
	writedata(0x12);    //Vcom
	writedata(0x80);

	writecommand(0x36);      //Memory Access
	writedata(0x48);

	writecommand(0x3A);      // Interface Pixel Format
	writedata(0x66); 	  //18 bit

	writecommand(0XB0);      // Interface Mode Control
	writedata(0x80);     			 //SDO NOT USE

	writecommand(0xB1);      //Frame rate
	writedata(0xA0);    //60Hz

	writecommand(0xB4);      //Display Inversion Control
	writedata(0x02);    //2-dot

	writecommand(0XB6);      //Display Function Control  RGB/MCU Interface Control

	writedata(0x02);    //MCU
	writedata(0x02);    //Source,Gate scan dieection

	writecommand(0XE9);      // Set Image Functio
	writedata(0x00);    // Disable 24 bit data

	writecommand(0xF7);      // Adjust Control
	writedata(0xA9);
	writedata(0x51);
	writedata(0x2C);
	writedata(0x82);    // D7 stream, loose


  writecommand(ILI9488_SLPOUT);    //Exit Sleep
  if (hwSPI) spi_end();
  delay(120);
  if (hwSPI) spi_begin();
  writecommand(ILI9488_DISPON);    //Display on
  if (hwSPI) spi_end();

}

void ILI9488::setScrollArea(uint16_t topFixedArea, uint16_t bottomFixedArea){
  if (hwSPI) spi_begin();
  writecommand(0x33); // Vertical scroll definition
  writedata(topFixedArea >> 8);
  writedata(topFixedArea);
  writedata((_height - topFixedArea - bottomFixedArea) >> 8);
  writedata(_height - topFixedArea - bottomFixedArea);
  writedata(bottomFixedArea >> 8);
  writedata(bottomFixedArea);
  if (hwSPI) spi_end();
}
void ILI9488::scroll(uint16_t pixels){
  if (hwSPI) spi_begin();
  writecommand(0x37); // Vertical scrolling start address
  writedata(pixels >> 8);
  writedata(pixels);
  if (hwSPI) spi_end();
}

void ILI9488::setAddrWindow(uint16_t x0, uint16_t y0, uint16_t x1,
 uint16_t y1) {

  writecommand(ILI9488_CASET); // Column addr set
  writedata(x0 >> 8);
  writedata(x0 & 0xFF);     // XSTART
  writedata(x1 >> 8);
  writedata(x1 & 0xFF);     // XEND

  writecommand(ILI9488_PASET); // Row addr set
  writedata(y0>>8);
  writedata(y0 &0xff);     // YSTART
  writedata(y1>>8);
  writedata(y1 &0xff);     // YEND

  writecommand(ILI9488_RAMWR); // write to RAM

}

void ILI9488::drawImage(const uint8_t* img, uint16_t x, uint16_t y, uint16_t w, uint16_t h){

    // 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;

    if (hwSPI) spi_begin();
    setAddrWindow(x, y, x+w-1, y+h-1);

    // uint8_t hi = color >> 8, lo = color;

  #if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
    *dcport |=  dcpinmask;
    *csport &= ~cspinmask;
  #else
    digitalWrite(_dc, HIGH);
    digitalWrite(_cs, LOW);
  #endif
  uint8_t linebuff[w*3+1];
  uint16_t pixels = w*h;
  // uint16_t count = 0;
  uint32_t count = 0;
  for (uint16_t i = 0; i < h; i++) {
    uint16_t pixcount = 0;
    for (uint16_t o = 0; o <  w; o++) {
      uint8_t b1 = img[count];
      count++;
      uint8_t b2 = img[count];
      count++;
      uint16_t color = b1 << 8 | b2;
      linebuff[pixcount] = (((color & 0xF800) >> 11)* 255) / 31;
      pixcount++;
      linebuff[pixcount] = (((color & 0x07E0) >> 5) * 255) / 63;
      pixcount++;
      linebuff[pixcount] = ((color & 0x001F)* 255) / 31;
      pixcount++;
    } // for row
    #if defined (__STM32F1__)
      SPI.dmaSend(linebuff, w*3);
    #else
      for(uint16_t b = 0; b < w*3; b++){
        spiwrite(linebuff[b]);
      }
    #endif

  }// for col
  #if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
    *csport |= cspinmask;
  #else
    digitalWrite(_cs, HIGH);
  #endif

    if (hwSPI) spi_end();
}


void ILI9488::pushColor(uint16_t color) {
  if (hwSPI) spi_begin();

#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  *dcport |=  dcpinmask;
  *csport &= ~cspinmask;
#else
  digitalWrite(_dc, HIGH);
  digitalWrite(_cs, LOW);
#endif

  // spiwrite(color >> 8);
  // spiwrite(color);
  // spiwrite(0); // added for 24 bit
  write16BitColor(color);

#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  *csport |= cspinmask;
#else
  digitalWrite(_cs, HIGH);
#endif

  if (hwSPI) spi_end();
}

void ILI9488::pushColors(uint16_t *data, uint8_t len, boolean first) {
  uint16_t color;
  uint8_t  buff[len*3+1];
  uint16_t count = 0;
  uint8_t lencount = len;
  if (hwSPI) spi_begin();
  #if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
    *csport &= ~cspinmask;
  #else
    digitalWrite(_cs, LOW);
  #endif
  if(first == true) { // Issue GRAM write command only on first call
    #if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
      *dcport |=  dcpinmask;
    #else
      digitalWrite(_dc, HIGH);
    #endif
  }
  while(lencount--) {
    color = *data++;
    buff[count] = (((color & 0xF800) >> 11)* 255) / 31;
    count++;
    buff[count] = (((color & 0x07E0) >> 5) * 255) / 63;
    count++;
    buff[count] = ((color & 0x001F)* 255) / 31;
    count++;
  }
  #if defined (__STM32F1__)
    SPI.dmaSend(buff, len*3);
  #else
    for(uint16_t b = 0; b < len*3; b++){
      spiwrite(buff[b]);
    }
  #endif
  #if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
    *csport |= cspinmask;
  #else
    digitalWrite(_cs, HIGH);
  #endif

    if (hwSPI) spi_end();
}

void ILI9488::write16BitColor(uint16_t color){
  // #if (__STM32F1__)
  //     uint8_t buff[4] = {
  //       (((color & 0xF800) >> 11)* 255) / 31,
  //       (((color & 0x07E0) >> 5) * 255) / 63,
  //       ((color & 0x001F)* 255) / 31
  //     };
  //     SPI.dmaSend(buff, 3);
  // #else
  uint8_t r = (color & 0xF800) >> 11;
  uint8_t g = (color & 0x07E0) >> 5;
  uint8_t b = color & 0x001F;

  r = (r * 255) / 31;
  g = (g * 255) / 63;
  b = (b * 255) / 31;

  spiwrite(r);
  spiwrite(g);
  spiwrite(b);
  // #endif
}

void ILI9488::drawPixel(int16_t x, int16_t y, uint16_t color) {

  if((x < 0) ||(x >= _width) || (y < 0) || (y >= _height)) return;

  if (hwSPI) spi_begin();
  setAddrWindow(x,y,x+1,y+1);

#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  *dcport |=  dcpinmask;
  *csport &= ~cspinmask;
#else
  digitalWrite(_dc, HIGH);
  digitalWrite(_cs, LOW);
#endif

  // spiwrite(color >> 8);
  // spiwrite(color);
  // spiwrite(0); // added for 24 bit
  write16BitColor(color);

#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  *csport |= cspinmask;
#else
  digitalWrite(_cs, HIGH);
#endif

  if (hwSPI) spi_end();
}


void ILI9488::drawFastVLine(int16_t x, int16_t y, int16_t h,
 uint16_t color) {

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

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

  if (hwSPI) spi_begin();
  setAddrWindow(x, y, x, y+h-1);

//  uint8_t hi = color >> 8, lo = color;

#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  *dcport |=  dcpinmask;
  *csport &= ~cspinmask;
#else
  digitalWrite(_dc, HIGH);
  digitalWrite(_cs, LOW);
#endif

  while (h--) {
    // spiwrite(hi);
    // spiwrite(lo);
    // spiwrite(0); // added for 24 bit
    write16BitColor(color);

  }

#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  *csport |= cspinmask;
#else
  digitalWrite(_cs, HIGH);
#endif

  if (hwSPI) spi_end();
}


void ILI9488::drawFastHLine(int16_t x, int16_t y, int16_t w,
  uint16_t color) {

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

  // uint8_t hi = color >> 8, lo = color;
#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  *dcport |=  dcpinmask;
  *csport &= ~cspinmask;
#else
  digitalWrite(_dc, HIGH);
  digitalWrite(_cs, LOW);
#endif
  while (w--) {
    // spiwrite(hi);
    // spiwrite(lo);
    // spiwrite(0); // added for 24 bit
    write16BitColor(color);
  }
#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  *csport |= cspinmask;
#else
  digitalWrite(_cs, HIGH);
#endif
  if (hwSPI) spi_end();
}

void ILI9488::fillScreen(uint16_t color) {
  fillRect(0, 0,  _width, _height, color);
}

// fill a rectangle
void ILI9488::fillRect(int16_t x, int16_t y, int16_t w, int16_t h,
  uint16_t color) {

  // 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;

  if (hwSPI) spi_begin();
  setAddrWindow(x, y, x+w-1, y+h-1);

  // uint8_t hi = color >> 8, lo = color;

#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  *dcport |=  dcpinmask;
  *csport &= ~cspinmask;
#else
  digitalWrite(_dc, HIGH);
  digitalWrite(_cs, LOW);
#endif
#if (__STM32F1__)
  //use dma fast fills
    uint8_t buff[4] = {
      (((color & 0xF800) >> 11)* 255) / 31,
      (((color & 0x07E0) >> 5) * 255) / 63,
      ((color & 0x001F)* 255) / 31
    };
    uint8_t linebuff[w*3+1];
    int cnt = 0;
    for(int i = 0; i < w; i++){
      linebuff[cnt]= buff[0];
      cnt++;
      linebuff[cnt]= buff[1];
      cnt++;
      linebuff[cnt]= buff[2];
      cnt++;
    }
    for(y=h; y>0; y--) {
        SPI.dmaSend(linebuff, w*3);
      }
#else
  for(y=h; y>0; y--) {
    for(x=w; x>0; x--) {
      // spiwrite(hi);
      // spiwrite(lo);
      // spiwrite(0); // added for 24 bit
      write16BitColor(color);
    }
  }
#endif
#if defined(USE_FAST_PINIO) && !defined (_VARIANT_ARDUINO_STM32_)
  *csport |= cspinmask;
#else
  digitalWrite(_cs, HIGH);
#endif

  if (hwSPI) spi_end();
}


// Pass 8-bit (each) R,G,B, get back 16-bit packed color
uint16_t ILI9488::color565(uint8_t r, uint8_t g, uint8_t b) {
  return ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3);
}


#define MADCTL_MY  0x80
#define MADCTL_MX  0x40
#define MADCTL_MV  0x20
#define MADCTL_ML  0x10
#define MADCTL_RGB 0x00
#define MADCTL_BGR 0x08
#define MADCTL_MH  0x04

void ILI9488::setRotation(uint8_t m) {

  if (hwSPI) spi_begin();
  writecommand(ILI9488_MADCTL);
  rotation = m % 4; // can't be higher than 3
  switch (rotation) {
   case 0:
     writedata(MADCTL_MX | MADCTL_BGR);
     _width  = ILI9488_TFTWIDTH;
     _height = ILI9488_TFTHEIGHT;
     break;
   case 1:
     writedata(MADCTL_MV | MADCTL_BGR);
     _width  = ILI9488_TFTHEIGHT;
     _height = ILI9488_TFTWIDTH;
     break;
  case 2:
    writedata(MADCTL_MY | MADCTL_BGR);
     _width  = ILI9488_TFTWIDTH;
     _height = ILI9488_TFTHEIGHT;
    break;
   case 3:
     writedata(MADCTL_MX | MADCTL_MY | MADCTL_MV | MADCTL_BGR);
     _width  = ILI9488_TFTHEIGHT;
     _height = ILI9488_TFTWIDTH;
     break;
  }
  if (hwSPI) spi_end();
}


void ILI9488::invertDisplay(boolean i) {
  if (hwSPI) spi_begin();
  writecommand(i ? ILI9488_INVON : ILI9488_INVOFF);
  if (hwSPI) spi_end();
}


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


uint8_t ILI9488::spiread(void) {
  uint8_t r = 0;

  if (hwSPI) {
#if defined (__AVR__)
  #ifndef SPI_HAS_TRANSACTION
    uint8_t backupSPCR = SPCR;
    SPCR = mySPCR;
  #endif
    SPDR = 0x00;
    while(!(SPSR & _BV(SPIF)));
    r = SPDR;

  #ifndef SPI_HAS_TRANSACTION
    SPCR = backupSPCR;
  #endif
#else
    r = SPI.transfer(0x00);
#endif

  } else {

    for (uint8_t i=0; i<8; i++) {
      digitalWrite(_sclk, LOW);
      digitalWrite(_sclk, HIGH);
      r <<= 1;
      if (digitalRead(_miso))
	r |= 0x1;
    }
  }
  //Serial.print("read: 0x"); Serial.print(r, HEX);

  return r;
}

 uint8_t ILI9488::readdata(void) {
   digitalWrite(_dc, HIGH);
   digitalWrite(_cs, LOW);
   uint8_t r = spiread();
   digitalWrite(_cs, HIGH);

   return r;
}


uint8_t ILI9488::readcommand8(uint8_t c, uint8_t index) {
   if (hwSPI) spi_begin();
   digitalWrite(_dc, LOW); // command
   digitalWrite(_cs, LOW);
   spiwrite(0xD9);  // woo sekret command?
   digitalWrite(_dc, HIGH); // data
   spiwrite(0x10 + index);
   digitalWrite(_cs, HIGH);

   digitalWrite(_dc, LOW);
   digitalWrite(_sclk, LOW);
   digitalWrite(_cs, LOW);
   spiwrite(c);

   digitalWrite(_dc, HIGH);
   uint8_t r = spiread();
   digitalWrite(_cs, HIGH);
   if (hwSPI) spi_end();
   return r;
}



/*

 uint16_t ILI9488::readcommand16(uint8_t c) {
 digitalWrite(_dc, LOW);
 if (_cs)
 digitalWrite(_cs, LOW);

 spiwrite(c);
 pinMode(_sid, INPUT); // input!
 uint16_t r = spiread();
 r <<= 8;
 r |= spiread();
 if (_cs)
 digitalWrite(_cs, HIGH);

 pinMode(_sid, OUTPUT); // back to output
 return r;
 }

 uint32_t ILI9488::readcommand32(uint8_t c) {
 digitalWrite(_dc, LOW);
 if (_cs)
 digitalWrite(_cs, LOW);
 spiwrite(c);
 pinMode(_sid, INPUT); // input!

 dummyclock();
 dummyclock();

 uint32_t r = spiread();
 r <<= 8;
 r |= spiread();
 r <<= 8;
 r |= spiread();
 r <<= 8;
 r |= spiread();
 if (_cs)
 digitalWrite(_cs, HIGH);

 pinMode(_sid, OUTPUT); // back to output
 return r;
 }

 */