마이크로프로세서 HOTatmega128 컴파일러 질문이요

아트메가 128을 배우고 있는 학생입니다. 
코딩을 코드비전으로 짯습니다.
근데 학교에서는 IAR 짜라고 하네요;;
잘몰라서 그러는데 밑에 쓴 코딩이 IAR에서 에러가 안날려면 어떻게 해야하나요;;
제발 도와주세요;;

#include <mega128.h>
#include <delay.h>

#define FUNCSET         0X28
#define ENTMODE        0X06
#define ALLCLR            0X01
#define DISPON            0X0C
#define LINE2               0XC0

void LCD_init(void);
void LCD_String(char flash *);
void Busy(void);
void Command(unsigned char);
void Data(unsigned char);

void main(void)
{

        LCD_init();
        LCD_String("Hello!! KUT-128");
        Command(LINE2);
        LCD_String("Atmel ATmega128");

 

while (1);

}

 

void LCD_init(void)
{
DDRC = 0xFF;
PORTC &= 0xFB;

delay_ms(15);
Command(0x20);

delay_ms(5);
Command(0x20);

delay_us(100);
Command(0x20);
Command(FUNCSET);
Command(DISPON);
Command(ALLCLR);
Command(ENTMODE);
}

 

void LCD_String(char flash *str)
{
        char flash *pStr=0;
        pStr = str;
        while(*pStr) Data(*pStr++);

}

 

void Command(unsigned char byte)
{
Busy();

PORTC = (byte & 0xF0);
PORTC &= 0xFE;
PORTC &= 0XFD;

delay_us(1);
PORTC |= 0X04;
delay_us(1);
PORTC &= 0XFB;
 /////////////////////////
PORTC = ((byte<<4) & 0xF0);
PORTC &= 0xFE;
PORTC &= 0XFD;

delay_us(1);
PORTC |= 0X04;
delay_us(1);
PORTC &= 0XFB;
}

 

void Data(unsigned char byte)
{
Busy();

PORTC = (byte & 0xF0);
PORTC |= 0x01;
PORTC &= 0XFD;

delay_us(1);
PORTC |= 0X04;
delay_us(1);
PORTC &= 0XFB;
////////////////
PORTC = ((byte<<4) & 0xF0);
PORTC |= 0x01;
PORTC &= 0XFD;

delay_us(1);
PORTC |= 0X04;
delay_us(1);
PORTC &= 0XFB;
}

 

void Busy(void)
{
delay_ms(2);
}