test.c 
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#include "LCD.h"  // LCD1602 
//---------------------------------------------------------- 
int main(void) 
{ 

  //             -> ---------------- <-  // 16bits 
  char Line1[16] = "LCD1602 Test"; 
  char Line2[16] = "by yf.c";  
  LCD_Test(Line1, Line2); 

  return 0; 
} 
//---------------------------------------------------------- 
----------------------------------------------------------------------------------------- 

LCD.h 
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#ifndef   __LCD_H__ 
#define   __LCD_H__ 

//  LCD Module 16*2 
#define lcd_write_cmd(data)     IOWR(LCD1602_BASE, 0, data) 
#define lcd_read_cmd()          IORD(LCD1602_BASE, 1) 
#define lcd_write_data(data)    IOWR(LCD1602_BASE, 2, data) 
#define lcd_read_data()         IORD(LCD1602_BASE, 3)  
//---------------------------------------------------------- 
void  LCD_Init(); 
void  LCD_Show_Text(char* Text); 
void  LCD_Line2(); 
void  LCD_Test(char* Text1, char* Text2); 
//---------------------------------------------------------- 

#endif 
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LCD.c 
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#include <unistd.h> 
#include <string.h> 
#include <io.h> 
#include "system.h" 
#include "LCD.h" 
//---------------------------------------------------------- 
void LCD_Init() 
{ 
  lcd_write_cmd(0x38);  usleep(5000);   // Display Mode 
  lcd_write_cmd(0x0C);  usleep(5000);   // Cursor Glint Mode 
  lcd_write_cmd(0x01);  usleep(5000);   // Clear Display 
  lcd_write_cmd(0x06);  usleep(5000);   // Cursor Move Forward Mode 
  lcd_write_cmd(0x80);  usleep(5000);   // Point to the Initial Address 
} 
//---------------------------------------------------------- 
void LCD_Show_Text(char* Text) 
{ 
  int i; 
  for(i=0;i<strlen(Text);i++) 
  { 
    lcd_write_data(Text[i]);  usleep(5000); 
  } 
} 
//---------------------------------------------------------- 
void LCD_Line2() 
{ 
  lcd_write_cmd(0xC0);  usleep(5000); 
} 
//---------------------------------------------------------- 
void LCD_Test(char* Text1, char* Text2) 
{ 
  LCD_Init();           //  Initial LCD 
  LCD_Show_Text(Text1); //  Show Text of Line1 to LCD   
  LCD_Line2();          //  Change Line2   
  LCD_Show_Text(Text2); //  Show Text of Line2 to LCD 
} 
//----------------------------------------------------------