Text String not Displaying on the Graphical LCD

Hello,

I have written a code for Graphical Serial LCD for displaying the Images on the Graphical LCD
The LCD is TIANAMA 128x64 with Hitachi Controller.

With help of this code i am able to show any graphics on the lcd, but i am not able to write any text in any line, It shows only raster image on the Screen.

Please guide for further to write 4 lines on the lcd.

#include <Philips\P89V66x.h>
#include <stdio.h>
#include <intrins.h>

#define SCK_bit 0
#define DIN_bit 2
#define SCK_set   P4 |= (1<<SCK_bit)
#define DIN_set   P4 |= (1<<DIN_bit)
#define SCK_clear P4 &= ~(1<<SCK_bit)
#define DIN_clear P4 &= ~(1<<DIN_bit)

sbit _CS = P2^3;
sbit _RST = P2^2;
sbit A0 = P2^1;

/* These are not working because P4 is located at 0xA1, not bit addressable with sbit extension
 * sbit SCK = P4^0;
 * sbit DIN = P4^2;
 */
unsigned char ContrastLevel;     // for contrast setting level

//-----------------------------------
// display data (128x64)
//-----------------------------------


unsigned char ContrastLevel;     // for contrast setting level

//-----------------------------------
// dispaly data (128x64)
//-----------------------------------

unsigned char code Logo[]=
{
...
...
};

//-----------------------------------
// Delay Routine
//-----------------------------------

void delayms(unsigned int m)        // 12MHz Xtal, close to ms value
{
    unsigned int j;
    unsigned int i;

    for(i=0; i<m; i++)
        for(j=0; j<109; j++)
            _nop_();
}

//-----------------------------------
// IO Routine
//-----------------------------------

void lcd_cmd(unsigned char Command)       //send command
{
    SCK_set;
    A0 = 0;
    _CS = 0;
        if (Command & 0x80) DIN_set; else DIN_clear; SCK_clear; SCK_set;
        if (Command & 0x40) DIN_set; else DIN_clear; SCK_clear; SCK_set;
        if (Command & 0x20) DIN_set; else DIN_clear; SCK_clear; SCK_set;
        if (Command & 0x10) DIN_set; else DIN_clear; SCK_clear; SCK_set;
        if (Command & 0x08) DIN_set; else DIN_clear; SCK_clear; SCK_set;
        if (Command & 0x04) DIN_set; else DIN_clear; SCK_clear; SCK_set;
        if (Command & 0x02) DIN_set; else DIN_clear; SCK_clear; SCK_set;
        if (Command & 0x01) DIN_set; else DIN_clear; SCK_clear; SCK_set;
    _CS = 1;

}

void lcd_data(unsigned char DData)        //send data
{
    SCK_set;
    A0 = 1;
    _CS = 0;
    if (DData & 0x80) DIN_set; else DIN_clear; SCK_clear; SCK_set;
    if (DData & 0x40) DIN_set; else DIN_clear; SCK_clear; SCK_set;
    if (DData & 0x20) DIN_set; else DIN_clear; SCK_clear; SCK_set;
    if (DData & 0x10) DIN_set; else DIN_clear; SCK_clear; SCK_set;
    if (DData & 0x08) DIN_set; else DIN_clear; SCK_clear; SCK_set;
    if (DData & 0x04) DIN_set; else DIN_clear; SCK_clear; SCK_set;
    if (DData & 0x02) DIN_set; else DIN_clear; SCK_clear; SCK_set;
    if (DData & 0x01) DIN_set; else DIN_clear; SCK_clear; SCK_set;
    _CS = 1;

}

//-----------------------------------
// Write a Screen
//-----------------------------------
void WriteScreen(unsigned char *DisplayData)    // DisplayData should be 164x64/8 = 1312byte
{
    unsigned char TempData;
    unsigned char i, j;
    for(i=0;i<8;i++)
        {
        lcd_cmd(0xb0 | i);    // select page 0~7
        lcd_cmd(0x10);        // start form column 4
        lcd_cmd(0x00);        // (2byte command)
        for(j=0;j<128;j++)
                {
            TempData=(*(DisplayData+(i*128)+j));
            lcd_data(TempData);
            }
        }
}

void lcd_string(unsigned char row_add, char *str_base)
{
        unsigned char i=0;
        lcd_cmd(row_add);
        while(str_base[i] != '\0')
        {
                lcd_data(str_base[i]);
                i++;
        }
}
//-----------------------------------
// Main Program
//-----------------------------------
void main()
{
     EA = 0;         // disable interrupts
    _CS = 1;
    _RST = 1;
    A0 = 1;
    SCK_set;
    DIN_set;

    initLCDM();
        LCD_Lighter();
        //WriteScreen(Logo);
        lcd_string(0x80,"Hello World");
    while(1);
}