I just got a lcd and shield that i ordered for a project and im trying to figure out the code (i think its well beyond my level) to get everything working right. i thought the best way to start breaking it down so i can understand it would be to use the example code from the people i got the screen and sheild from but there was a compliing error in it and i have no idea whats wrong or how to fix it. could really use a hand from the experts here 
/*This example code is 16bit mode for TFT4.3 / TFT5.0 demo.
The demo used TFT01 Mega Shield and connect the pins to Arduino first :
DB0-DB16 to pin 22-29, 30-37
All the data pins of Arduino is used ….So , we just can connect the RD to 3.3V ….We don’t used it because we don’t need to read back the data from the screen.
Connect the power pins : LCD-A to 3.3V , VCC to 5V , GND to GND
Note that if you haven't TFT01 Mega Shilld,the LCM is use the 3.3V voltage level , so if you want to connect the 5V Arduino pins to it , you need add a resister about 20K to reduce voltage. We use the 3.3V Arduino Pro which work in 8M ,
so we connect the pins directly — this is why we used 16 bit mode, 8 bit mode is too slow to refresh the screen.
Create by Robi.Wang On 9-June-2012
Version 2.2 www.elecfreaks.com
*/
/* Display IO */
#define LCD_RS 38
#define LCD_WR 39
#define LCD_CS 40
#define LCD_REST 41
/* Touch IO */
#define DCLK 6
#define CS 5
#define DIN 4
#define DOUT 3
#define IRQ 2
unsigned int HDP=479;
unsigned int HT=531;
unsigned int HPS=43;
unsigned int LPS=8;
unsigned char HPW=10;
unsigned int VDP=271;
unsigned int VT=288;
unsigned int VPS=12;
unsigned int FPS=4;
unsigned char VPW=10;
struct pix_
{
unsigned int x;
unsigned int y;
};
struct pix_ Tp_pix;
void spistar() //SPI Start
{
digitalWrite(CS,HIGH);
digitalWrite(DCLK,HIGH);
digitalWrite(DIN,HIGH);
digitalWrite(DCLK,HIGH);
}
//*
void WriteCharTo7843(unsigned char num) //SPI Write Data
{
unsigned char count=0;
unsigned char temp;
unsigned nop;
temp=num;
digitalWrite(DCLK,LOW);
for(count=0;count<8;count++)
{
if(temp&0x80)
digitalWrite(DIN,HIGH);
else
digitalWrite(DIN,LOW);
temp=temp<<1;
digitalWrite(DCLK,LOW);
nop++;
nop++;
digitalWrite(DCLK,HIGH);
nop++;
nop++;
}
}
//*
unsigned int ReadFromCharFrom7843() //SPI Read Data
{
unsigned nop;
unsigned char count=0;
unsigned int Num=0;
for(count=0;count<12;count++)
{
Num<<=1;
digitalWrite(DCLK,HIGH);//DCLK=1; _nop_();_nop_();_nop_();
nop++;
digitalWrite(DCLK,LOW);//DCLK=0; _nop_();_nop_();_nop_();
nop++;
if(digitalRead(DOUT)) Num++;
}
return(Num);
}
//void AD7843(void)
struct pix_ AD7843()
{
struct pix_ pix;
digitalWrite(CS,LOW);
WriteCharTo7843(0x90);
digitalWrite(DCLK,HIGH);
digitalWrite(DCLK,LOW);
pix.y=ReadFromCharFrom7843();
WriteCharTo7843(0xD0);
digitalWrite(DCLK,HIGH);
digitalWrite(DCLK,LOW);
pix.x=ReadFromCharFrom7843();
digitalWrite(CS,HIGH);
return pix;
}
void Lcd_Writ_Bus(char VH,char VL)
{
PORTA = VH;
PORTC = VL;
digitalWrite(LCD_WR,LOW);
digitalWrite(LCD_WR,HIGH);
}
void Lcd_Write_Com(char VH,char VL)
{
digitalWrite(LCD_RS,LOW);
Lcd_Writ_Bus(VH,VL);
}
void Lcd_Write_Data(char VH,char VL)
{
digitalWrite(LCD_RS,HIGH);
Lcd_Writ_Bus(VH,VL);
}
void LCD_WR_Data(int da)
{
digitalWrite(LCD_RS, 1);
Lcd_Writ_Bus(da>>8,da);
}
void LCD_WR_REG(int da)
{
digitalWrite(LCD_RS,0);
Lcd_Writ_Bus(da>>8,da);
}
void Address_set(unsigned int x1,unsigned int y1,unsigned int x2,unsigned int y2)
{
LCD_WR_REG(0x002A);
LCD_WR_Data(x1>>8);
LCD_WR_Data(x1&0x00ff);
LCD_WR_Data(x2>>8);
LCD_WR_Data(x2&0x00ff);
LCD_WR_REG(0x002b);
LCD_WR_Data(y1>>8);
LCD_WR_Data(y1&0x00ff);
LCD_WR_Data(y2>>8);
LCD_WR_Data(y2&0x00ff);
LCD_WR_REG(0x002c);
}
void Lcd_Init(void)
{
digitalWrite(LCD_REST,HIGH);
delay(5);
digitalWrite(LCD_REST,LOW);
delay(15);
digitalWrite(LCD_REST,HIGH);
delay(15);
digitalWrite(LCD_CS ,HIGH);
digitalWrite(LCD_WR ,HIGH);
digitalWrite(LCD_CS, LOW);
LCD_WR_REG(0x00E2); //PLL multiplier, set PLL clock to 120M
LCD_WR_Data(0x002d); //N=0x36 for 6.5M, 0x23 for 10M crystal
LCD_WR_Data(0x0002);
LCD_WR_Data(0x0004);
LCD_WR_REG(0x00E0); // PLL enable
LCD_WR_Data(0x0001);
delay(1);
LCD_WR_REG(0x00E0);
LCD_WR_Data(0x0003);
delay(5);
LCD_WR_REG(0x0001); // software reset
delay(5);
LCD_WR_REG(0x00E6); //PLL setting for PCLK, depends on resolution
LCD_WR_Data(0x0000);
LCD_WR_Data(0x00ff);
LCD_WR_Data(0x00be);
LCD_WR_REG(0x00B0); //LCD SPECIFICATION
LCD_WR_Data(0x0020);
LCD_WR_Data(0x0000);
LCD_WR_Data((HDP>>8)&0X00FF); //Set HDP
LCD_WR_Data(HDP&0X00FF);
LCD_WR_Data((VDP>>8)&0X00FF); //Set VDP
LCD_WR_Data(VDP&0X00FF);
LCD_WR_Data(0x0000);
delay(5);
LCD_WR_REG(0x00B4); //HSYNC
LCD_WR_Data((HT>>8)&0X00FF); //Set HT
LCD_WR_Data(HT&0X00FF);
LCD_WR_Data((HPS>>8)&0X00FF); //Set HPS
LCD_WR_Data(HPS&0X00FF);
LCD_WR_Data(HPW); //Set HPW
LCD_WR_Data((LPS>>8)&0X00FF); //SetLPS
LCD_WR_Data(LPS&0X00FF);
LCD_WR_Data(0x0000);
LCD_WR_REG(0x00B6); //VSYNC
LCD_WR_Data((VT>>8)&0X00FF); //Set VT
LCD_WR_Data(VT&0X00FF);
LCD_WR_Data((VPS>>8)&0X00FF); //Set VPS
LCD_WR_Data(VPS&0X00FF);
LCD_WR_Data(VPW); //Set VPW
LCD_WR_Data((FPS>>8)&0X00FF); //Set FPS
LCD_WR_Data(FPS&0X00FF);
LCD_WR_REG(0x0036); //rotation
LCD_WR_Data(0x0000);
LCD_WR_REG(0x00F0); //pixel data interface
LCD_WR_Data(0x0003);
delay(5);
LCD_WR_REG(0x0029); //display on
LCD_WR_REG(0x00BE); //set PWM for B/L
LCD_WR_Data(0x0006);
LCD_WR_Data(0x00f0);
LCD_WR_Data(0x0001);
LCD_WR_Data(0x00f0);
LCD_WR_Data(0x0000);
LCD_WR_Data(0x0000);
LCD_WR_REG(0x00d0);
LCD_WR_Data(0x000d);
//----------LCD RESET---GPIO0-------------------//
LCD_WR_REG(0x00B8);
LCD_WR_Data(0x0000); //GPIO3=input, GPIO[2:0]=output
LCD_WR_Data(0x0001); //GPIO0 normal
LCD_WR_REG(0x00BA);
LCD_WR_Data(0x0000);
}
void Pant(char VH,char VL)
{
int i,j;
Address_set(0,0,HDP+1,VDP+1);
for(i=0;i<HDP+1;i++)
{
for (j=0;j<VDP+1;j++)
{
Lcd_Write_Data(VH,VL);
}
}
}
unsigned char Makpix(struct pix_ pix1,struct pix_ pix2) //Filtering
{
unsigned char l=0;
int x=pix1.x>pix2.x?pix1.x-pix2.x:pix2.x-pix1.x;
int y=pix1.y>pix2.y?pix1.y-pix2.y:pix2.y-pix1.y;
if(x<10&&y<10)
{
l=1;
Tp_pix.x=pix1.x;
Tp_pix.y=pix1.y;
}
return l;
}
unsigned char Getpix()
{
struct pix_ pix1;
struct pix_ pix2;
pix1=AD7843();
pix2=AD7843();
return Makpix(pix1,pix2);
}
void setup()
{
for(int p=22;p<42;p++)
{
pinMode(p,OUTPUT);
}
for(int p=2; p<7;p++)
pinMode(p,OUTPUT);
pinMode(DOUT,INPUT);
pinMode(IRQ,INPUT);
Lcd_Init();
Pant(0x00, 0x00);
delay(500);
spistar();
}
void loop(){
unsigned int lx,ly;
int pacy=random(0, 7);
while(digitalRead(IRQ)==0)
{
if(Getpix()==1)
{
lx=HDP-((Tp_pix.x-380)*10/69);
if(lx>HDP) lx=HDP;
ly=VDP-((Tp_pix.y-600)*10/111);
if(ly>VDP) ly=VDP;
Address_set(lx,ly,lx+2,ly+2);
switch(pacy)
{
case 0: for(int i=0; i<7; i++) Lcd_Write_Data(0xF8,0x00); break; //Red
case 1: for(int i=0; i<7; i++) Lcd_Write_Data(0xFF,0xE0); break; //Yellow
case 2: for(int i=0; i<7; i++) Lcd_Write_Data(0xFF,0xFF); break; //White
case 3: for(int i=0; i<7; i++) Lcd_Write_Data(0x05,0x1F); break; //Blue
case 4: for(int i=0; i<7; i++) Lcd_Write_Data(0x00,0x1F); break; //Blue-2
case 5: for(int i=0; i<7; i++) Lcd_Write_Data(0xF8,0x1F); break; //Magenta
case 6: for(int i=0; i<7; i++) Lcd_Write_Data(0x07,0xE0); break; //Green
case 7: for(int i=0; i<7; i++) Lcd_Write_Data(0x7F,0xFF); break; //Cyan
defoult:for(int i=0; i<7; i++) Lcd_Write_Data(0x00,0x00); break; //Black
}
}
}
}
the error i get back is,
sketch_jan28a.ino: In function 'void Lcd_Writ_Bus(char, char)':
sketch_jan28a:121: error: 'PORTA' was not declared in this scope
sketch_jan28a:122: error: 'PORTC' was not declared in this scope
any idea what needs to be done to fix that? thanks for your time