...

#define D7_PORT PORTD
#define D7_BIT  (4)
#define CLR_D7() CLR_PORT_BIT(D7_PORT, D7_BIT)
#define SET_D7() SET_PORT_BIT(D7_PORT, D7_BIT)

#define D6_PORT PORTD
#define D6_BIT  (3)
#define CLR_D6() CLR_PORT_BIT(D6_PORT, D6_BIT)
#define SET_D6() SET_PORT_BIT(D6_PORT, D6_BIT)

#define D5_PORT PORTD
#define D5_BIT  (2)
#define CLR_D5() CLR_PORT_BIT(D5_PORT, D5_BIT)
#define SET_D5() SET_PORT_BIT(D5_PORT, D5_BIT)

#define D4_PORT PORTD
#define D4_BIT  (1)
#define CLR_D4() CLR_PORT_BIT(D4_PORT, D4_BIT)
#define SET_D4() SET_PORT_BIT(D4_PORT, D4_BIT)

#define RS_PORT PORTC
#define RS_BIT  (4)
#define CLR_RS() CLR_PORT_BIT(RS_PORT, RS_BIT)
#define SET_RS() SET_PORT_BIT(RS_PORT, RS_BIT)

#define E_PORT PORTC
#define E_BIT  (5)
#define CLR_E() CLR_PORT_BIT(E_PORT, E_BIT)
#define SET_E() SET_PORT_BIT(E_PORT, E_BIT)

    ...

#define LCD_CLEAR()                    LCD_Set(0x01)
#define LCD_RESET()                    LCD_Set(0x02)
#define LCD_AC_DEC_MODE()            LCD_Set(0x04)
#define LCD_AC_INC_MODE()            LCD_Set(0x06)
#define LCD_SHIFT_LEFT_MODE()        LCD_Set(0x05)
#define LCD_SHIFT_RIGHT_MODE()            LCD_Set(0x07)
#define LCD_DISPLAY_ON()            LCD_Set(0x0C)
#define LCD_DISPLAY_OFF()            LCD_Set(0x08)
#define LCD_CURSOR_ON()            LCD_Set(0x0E)
#define LCD_CURSOR_OFF()            LCD_Set(0x08)
#define LCD_BLANK_ON()                LCD_Set(0x0D)
#define LCD_BLANK_OFF()                LCD_Set(0x08)
#define LCD_SET_CURSOR_LEFT()        LCD_Set(0x10)
#define LCD_SET_CURSOR_RIGHT()            LCD_Set(0x14)
#define LCD_SET_DISPLAY_LEFT()        LCD_Set(0x18)
#define LCD_SET_DISPLAY_RIGHT()            LCD_Set(0x1C)
#define LCD_SET_CGR_ADDR(a)        LCD_Set(0x40 | a)
#define LCD_SET_DDR_ADDR(a)        LCD_Set(0x80 | a)


void LCD_Bus_Write(char data){    
    CLR_D7();
    CLR_D6();
    CLR_D5();
    CLR_D4();
    if (data & 0x80){SET_D7();}
    if (data & 0x40){SET_D6();}
    if (data & 0x20){SET_D5();}
    if (data & 0x10){SET_D4();}
    SET_E();
    Delay_mSeconds(1);
    CLR_E();
    Delay_mSeconds(1);
    CLR_D7();
    CLR_D6();
    CLR_D5();
    CLR_D4();
    if (data & 0x08){SET_D7();}
    if (data & 0x04){SET_D6();}
    if (data & 0x02){SET_D5();}
    if (data & 0x01){SET_D4();}
    SET_E();
    Delay_mSeconds(1);                        
    CLR_E();
    Delay_mSeconds(1);


    /*PORTD=(PORTD&0x0f)|(data&0xf0);
    SET_E();
    Delay_mSeconds(1);
    CLR_E();
    Delay_mSeconds(4);
    data<<=4;
    PORTD=(PORTD&0x0f)|(data&0xf0);
    SET_E();
    Delay_mSeconds(1);                        
    CLR_E();
    Delay_mSeconds(4);*/

}


void LCD_Set(char cmd){    
    LCD_Bus_Write(cmd);
}


void LCD_GOTO_XY(char x,char y){
    if(y==1) {LCD_SET_DDR_ADDR(x);}
    if(y==2) {LCD_SET_DDR_ADDR(x+64);}
}


void LCD_Init(void){
    Delay_mSeconds(350);
    LCD_Bus_Write(0x30);
    Delay_mSeconds(5);
    LCD_Bus_Write(0x30);
    Delay_mSeconds(1);
    LCD_Bus_Write(0x30);
    LCD_Bus_Write(0x32);
    LCD_Bus_Write(0x28);
    LCD_Bus_Write(0x08);
    LCD_Bus_Write(0x01);
    LCD_Bus_Write(0x06);
    LCD_DISPLAY_OFF();
    LCD_RESET();
    LCD_CLEAR();
    LCD_DISPLAY_ON();    
    LCD_GOTO_XY(0,0);
}


void LCD_DisplayCharacter ( char Char){
    SET_RS();
    Delay_mSeconds(1);
    LCD_Bus_Write (Char);
    CLR_RS();
    Delay_mSeconds(1);
}


void LCD_DisplayString (unsigned char *string){
    while (*string)
    LCD_DisplayCharacter (*string++);
}


void Init_Devices(){
    ...
    LCD_Init();
    ...
}

    ...

main(void){
    Init_Devices();
    LCD_GOTO_XY(0,1);  
    LCD_DisplayString("Hello World!");
}