Serial LCD Design and Progrmming

#define LCD_BackLight_BIT          (1<<1)
#define LCD_RS_BIT                 (1<<2)
#define LCD_E_BIT                  (1<<3)
#define LCD_Data_Mask               0xF0
#define LCD_CMD_Mask                0x0E
#define LCD_Delay                   5

unsigned char SPI_DAT = LCD_BackLight_BIT;

void LCD_init(void)
{
        delay_ms(17);
        LCD_Write(0x30);
        delay_ms(1);
        LCD_Write(0x30);
        delay_ms(1);
        LCD_Write(0x30);
        delay_ms(1);
        LCD_Write(0x20);  //4 bit wide bus
                  
        LCD_Send_Cmd(0x28);           //4bit wide bus 2 rows
        LCD_Send_Cmd(0x10);
        LCD_Send_Cmd(0x01);
        LCD_Send_Cmd(0x0F);

        LCD_Send_Cmd(LCD_CMD_Cursor_Off);
        LCD_Send_Cmd(LCD_CMD_Clear);
        delay_ms(10);
}

void LCD_Write(unsigned char Dat)
{         
 SPI_DAT&=(LCD_RS_BIT|LCD_BackLight_BIT|LED_BLUE);
 SPI_DAT|=(Dat&LCD_Data_Mask)|LCD_E_BIT;

 PIN_OFF(LCD_CS);
 SPI_SendByte(SPI_DAT);
 PIN_ON(LCD_CS);

 SPI_DAT&=~LCD_E_BIT;
 PIN_OFF(LCD_CS);
 SPI_SendByte(SPI_DAT);
 PIN_ON(LCD_CS);

}
void LCD_Send_Cmd(unsigned char CMD)
{
        delay_ms(5);
        SPI_DAT&=~LCD_RS_BIT;
        LCD_Write((CMD&0xF0));
        LCD_Write(((CMD&0x0F)<<4));
        delay_ms(5);
}

void lcd_set_position(unsigned char row, unsigned char colum)
{
        unsigned char position = 0x80;
        if (row > 0) { position |= 0x40;}
        LCD_Send_Cmd(position | colum);
}

void lcd_write_data(unsigned char dat)
{
        delay_us(50);
        SPI_DAT|=LCD_RS_BIT;
        LCD_Write((dat&0xF0));
        LCD_Write(((dat&0x0F)<<4));
}

void LCD_BackLight (unsigned char State, unsigned char BlueLed)
{
  if (State)  SPI_DAT|=LCD_BackLight_BIT;
  else   SPI_DAT&=~LCD_BackLight_BIT;
  if (BlueLed == 0) SPI_DAT|=LED_BLUE;
  else SPI_DAT&=~LED_BLUE;
}

void lcd_print_char(char dat)
{
   if (dat == '\n') LCD_Send_Cmd(0x80 | 0x40); 
               else lcd_write_data(dat);
}

void lcd_print_string(char * string)
{
   while (*string) lcd_print_char(*string++);
}