Cómo mostrar imágenes en una pantalla LCD TFT

/*
/Newhaven Display invierte tiempo y recursos en proporcionar este código abierto.
/¡Apoye a Newhaven Display comprando productos de Newhaven Display! 
*
* Este código se proporciona solo a modo de ejemplo y sin ninguna garantía por parte de Newhaven Display. 
* Newhaven Display no se hace responsable de ningún problema que pueda derivarse de su uso.
* El desarrollador de la aplicación final que incorpore cualquier parte de este 
* código de muestra es responsable de garantizar su funcionamiento seguro y correcto
* y de cualquier consecuencia derivada de su uso. 
* Consulte la Licencia Pública General de GNU para obtener más detalles.
*/
#include 
#include 
#include 
/****************************************************
*         PINOUT: Arduino Due -> 2.4" TFT           *
*****************************************************/
#define    RS   2     
#define    WR  11
const char slave = 0x38;
const int ChipSelect = 49;
int image_value = 0;
File myFile;
/****************************************************
*                 Function Commands                  *
******************************************************/
void comm_out(unsigned char c)
{
  PIOB -> PIO_CODR = 1 << 25;   //RS LOW
  REG_PIOC_ODSR = c << 1; 
  PIOD -> PIO_CODR = 1 << 7;    //WR LOW
  PIOD -> PIO_SODR = 1 << 7;    //WR HIGH
}
void data_out(unsigned char d)
{
  PIOB -> PIO_SODR = 1 << 25;   //RS HIGH
  REG_PIOC_ODSR = d << 1;
  PIOD -> PIO_CODR = 1 << 7;    //WR LOW
  PIOD -> PIO_SODR = 1 << 7;    //WR HIGH
}
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//  Window Set Function
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
void window_set(unsigned s_x, unsigned e_x, unsigned s_y, unsigned e_y)
{
  comm_out(0x2a);    //SET column address
  data_out((s_x)>>8);     //SET start column address
  data_out(s_x);
  data_out((e_x)>>8);     //SET end column address
  data_out(e_x);
  comm_out(0x2b);    //SET page address
  data_out((s_y)>>8);     //SET start page address
  data_out(s_y);
  data_out((e_y)>>8);     //SET end page address
  data_out(e_y);
}
/****************************************************
*         Initialization and Setup Routine          *
*****************************************************/
void setup()
{
  delay(100);
  pinMode(RS,OUTPUT);  
  pinMode(WR,OUTPUT);  
  PIOC->PIO_OER = 0xFFFFFFFF;
  digitalWrite(WR, LOW);
  comm_out(0x28);  //display off
  comm_out(0x11);  //exit SLEEP mode
  delay(100);
  comm_out(0x36);  //MADCTL: memory data access control
  data_out(0x10);  //changing from 0x88
  comm_out(0x21);  //display inversion
  comm_out(0x3A);  //COLMOD: Interface Pixel format  *** 65K-colors in 16bit/pixel (5-6-5) format when using 16-bit interface to allow 1-byte per pixel
  data_out(0x55);  //0x55 = 65k   //0x65 = 262k
  comm_out(0xB2);  //PORCTRK: Porch setting
  data_out(0x0C);
  data_out(0x0C);
  data_out(0x00);
  data_out(0x33);
  data_out(0x33);
  comm_out(0xB7);  //GCTRL: Gate Control
  data_out(0x35);
  comm_out(0xBB);  //VCOMS: VCOM setting
  data_out(0x2B);
  comm_out(0xC0);  //LCMCTRL: LCM Control
  data_out(0x2C);
  comm_out(0xC2);  //VDVVRHEN: VDV and VRH Command Enable
  data_out(0x01);
  data_out(0xFF);
  comm_out(0xC3);  //VRHS: VRH Set
  data_out(0x11);
  comm_out(0xC4);  //VDVS: VDV Set
  data_out(0x20);
  comm_out(0xC6);  //FRCTRL2: Frame Rate control in normal mode
  data_out(0x0F);
  comm_out(0xD0);  //PWCTRL1: Power Control 1
  data_out(0xA4);
  data_out(0xA1);
  comm_out(0xE0);  //PVGAMCTRL: Positive Voltage Gamma control  
  data_out(0xD0);
  data_out(0x00);
  data_out(0x05);
  data_out(0x0E);
  data_out(0x15);
  data_out(0x0D);
  data_out(0x37);
  data_out(0x43);
  data_out(0x47);
  data_out(0x09);
  data_out(0x15);
  data_out(0x12);
  data_out(0x16);
  data_out(0x19);
  comm_out(0xE1);  //NVGAMCTRL: Negative Voltage Gamma control  
  data_out(0xD0);
  data_out(0x00);
  data_out(0x05);
  data_out(0x0D);
  data_out(0x0C);
  data_out(0x06);
  data_out(0x2D);
  data_out(0x44);
  data_out(0x40);
  data_out(0x0E);
  data_out(0x1C);
  data_out(0x18);
  data_out(0x16);
  data_out(0x19);
  comm_out(0x2A);  //X address set
  data_out(0x00);
  data_out(0x00);
  data_out(0x00);
  data_out(0xEF);
  comm_out(0x2B);  //Y address set
  data_out(0x00);
  data_out(0x00);
  data_out(0x01);
  data_out(0x3F);
  delay(10);
  comm_out(0x29);  //display ON
  delay(10);
  SD.begin(ChipSelect);
}
/*****************************************************
*           Loop Function, to run repeatedly         *
*****************************************************/
void loop()
{ 
  SD_Card_Image(1);
  delay(5000);
  //SD_Card_Image(2);
  //delay(5000);
  //SD_Card_Image(3);
  //delay(5000);
  //SD_Card_Image(4);
  //delay(5000);
  //SD_Card_Image(5);
  //delay(5000);
}
void SD_Card_Image(unsigned char image){       /*The images used are in a textfile*/
    unsigned char dummy;
    unsigned int incr =0;
    switch (image){
      case 1: 
        image_value=1;
        myFile = SD.open("image1.txt");  
        break;
      case 2:
        image_value=2;
        myFile =SD.open("image2.txt");    
        break;    
      case 3:
        image_value=3;
        myFile = SD.open("image3.txt");   
        break;     
      case 4:
        image_value=4;
        myFile = SD.open("image4.txt");   
        break; 
      case 5:
        image_value=5;
        myFile = SD.open("image5.txt");   
        break;           
    }
  comm_out(0x2A);  /*X address set*/
  data_out(0x00);
  data_out(0x00);
  data_out(0x00);
  data_out(0xEF);
  comm_out(0x2B);  /*Y address set*/
  data_out(0x00);
  data_out(0x00);
  data_out(0x01);
  data_out(0x3F);      
  comm_out(0x2C);  /*command to begin writing to frame memory     */
  byte  data_in1,data_in2,data_in,data_out_value;
  uint8_t data_send;
  char data_conv[1]={0};
  int i;  
  int track ;
  while (myFile.available()){ /*convert the input char data to integers*/
        dummy = myFile.read(); 
        dummy = myFile.read(); 
        data_in1 = myFile.read(); 
        data_in2 = myFile.read(); 
        data_in=data_in1;
        if(data_in >=48 && data_in<=57){    /*if values are in range of 0-9 values*/
            data_in1 = data_in-48;
            track=1;
          }
          if(data_in <=102 && data_in>=97){ /*if values are in range of a-f*/
            data_in1 = data_in - 87; 
            track=1;
          }
          if( data_in ==32/*Space*/ || data_in==44 /*comma*/ || data_in == 120 /*x*/){
            dummy =data_in;
            track=0;
            data_in1 =0;
            data_in2 =0;
          }      
        data_in=data_in2;
        if(data_in >=48 && data_in<=57){   /*if values are in range of 0-9 values*/
            data_in2 = data_in-48;
            track=1;
          }
          if(data_in <=102 && data_in>=97){/*if values are in range of a-f*/
            data_in2 = data_in - 87; 
            track=1;
          }
          if( data_in ==32/*Space*/ || data_in==44 /*comma*/ || data_in == 120 /*x*/){/*skip dummy data*/
            dummy =data_in;
            track=0;
            data_in1 =0;
            data_in2 =0;
          }              
        dummy = myFile.read(); 
        dummy = myFile.read();  
        data_out_value = data_in1<<4 | data_in2;  
        data_out(data_out_value);
      }
      myFile.close();   
}