#include <REG52.H>
sbit p_di=P1^0;
sbit p_rw=P1^1;
sbit p_e=P1^2;
sbit p_csa=P1^3;
sbit p_csb=P1^4;
 void delay(unsigned char time)
    {
	unsigned char i;
	for(;time>0;time--)
	for(i=0;i<5;i++);
	
	}
void lcd_busy(void)
{
p_di=0;p_rw=1;P0=0xff;
 while(1)
 {
  p_e=1;
  if(P0<0x80) break;
 p_e=0;
 }
 
 p_e=0;
 p_rw=0;
} 


void set_xy(unsigned char x,unsigned char y)
{
 if(x>=64)
 {p_csa=0;p_csb=1;} 
 else 
 {p_csb=0;
 p_csa=1;}
lcd_busy();

 p_di=0;
 P0=0x40|x;
 p_e=1;
 p_e=0;
 lcd_busy();

 p_di=0;
 P0=0xb8|y;
 p_e=1;
 p_e=0;
 P0=0xff;
}

void writelcd(unsigned char x,unsigned char y,unsigned char dat)
{
 set_xy(x,y);
 lcd_busy();

 p_di=1;
 P0=dat;
 p_e=1;
 p_e=0;
 P0=0xff;
}


void lcd_init(void)
{
 unsigned char x,y;


 p_e=p_di=0;
 p_csa=p_csb=0;
 p_csa=1;
lcd_busy();

 P0=0x3f;
 p_e=1;
 p_e=0;
 p_csa=0;
 p_csb=1;
lcd_busy();

 P0=0x3f;
 p_e=1;
 p_e=0;
 p_csb=0;
 p_csa=1;
 lcd_busy();

 p_di=0;
 P0=0xc0;
 p_e=1;
 p_e=0;
 p_csa=0;
 p_csb=1;

 lcd_busy();
 p_di=0;
 P0=0xc0;
 p_e=1;
 p_e=0;
 p_csb=0;
 for (y=0;y<8;y++)
 {
  for (x=0;x<128;x++) writelcd(x,y,0);
 }
}


void main(void)
{
  delay(10);
 lcd_init();
  writelcd(0,0,0xff);

 for(;;);
}