3 Wire serial lcd [ 74HC595 and LCD]

                   //4bit lcd mode  

#define L_SCK RD0   //LATCH CK
#define S_SCK RD1  //SHIFT CK
#define SDO   RD2  //DATA OUTPUT

#define LATCH  L_SCK=1;  L_SCK=0;    
#define SHIFT  S_SCK=1;  S_SCK=0;


void serial_lcd(unsigned char val)
{
for(char i=0;i<8;i++)
{
 SDO=(val&0X80)>>7; val<<=1;   //LSB  lcd control pins    and   MSB Lcd data pins  
 SHIFT;
}
 LATCH;
}


void lcd_send(unsigned char type,unsigned char val)	  //type 0=command 1=data  lcd value  	 
{

   serial_lcd(type|(val&0xf0));            //Set RS  and Data 
   serial_lcd(0x04|(val&0xf0));            // EN=1   and Data 
   serial_lcd(type|(val&0xf0));            //EN=0    and Data 

   serial_lcd(type|((val<<4)&0xf0));    //Set RS  and Data 
   serial_lcd(0x04|(val<<4)&0xf0);      // EN=1   and Data 
   serial_lcd(type|((val<<4)&0xf0));    //EN=0    and Data 

}