#include   <stdio.h>
#include <intrins.h>
#include <reg52.h>

sbit CS1=P3^7;
sbit WRR=P3^6;
sbit DI=P2^1;
sbit GO1=P2^4;
sbit GO2=P2^5;
sbit SL=P2^3;



void Delay(unsigned int i)
{
    unsigned char a;
    unsigned int b;
    for(b=0;b<i;b++)
    for(a=0;a<255;a++);
}

bit Wait()
{  
    bit GO=0;
    while(1)
    {   
        if(GO1==0||GO2==0)
        {
            if(GO2==0)GO=1;
            Delay(250);
            while(GO1==0||GO2==0);
			return GO;
        }
    }
}


Write()
{
     WRR=1;
     _nop_();
     _nop_();
     WRR=0;
    _nop_();
    _nop_();
}

void write_cmd(unsigned char cmd)
{
     unsigned char j,mask;
     CS1=0;
     WRR=0;
     DI=1;
     Write();
     DI=0;
     Write();
     DI=0;
     Write();
     for(j=0, mask=0x80; j<8; j++, mask>>=1 )
     {   
       if( (cmd & mask) != 0 )
       DI=1;
       else 
       DI=0;
       Write();
     }
     Write();
     CS1=1;
}

void write_dat(unsigned char add,unsigned char dat)
{
     unsigned char j,mask;
     CS1=0;
     WRR=0;
     DI=1;
     Write();
     DI=0;
     Write();
     DI=1;
     Write();
     for(j=0, mask=0x20; j<6; j++, mask>>=1 )
     {   
       if(( add & mask)!=0 )
       DI=1;
       else 
       DI=0;
       Write();
     }  
     for(j=0, mask=0x01; j<4; j++, mask<<=1 )
     {   
       if(( dat & mask) != 0 )
       DI=1;
       else 
       DI=0;
       Write();
     } 
     CS1=1;
 } 


     
void ht1622initial(void)
{
     write_cmd(0x01);   //SYS EN
     write_cmd(0x18);   //RC 256k
     write_cmd(0x03);   //LCD ON
     write_cmd(0xe3);   //BIAS
}


void Display(unsigned char d)
{ 
     unsigned char i;
     for(i=0;i<64;i++)
     write_dat(i,d);    
}




display_point()
{
     unsigned char n=0;
	 while(1)
	 {
	      Display(0x00);
	      write_dat(n/4,0x01<<(n%4));
		  if(Wait()==1)
		     if(n==0)n=255;
		     else n--;
		  else
		     if(n==255)n=0;
		     else n++ ;
	 }
}
		 
		  


void main(void)
{  
    ht1622initial();
	if(SL==0)
	{
		Display(0xff);
	    Wait();
		Display(0x00);
	    Wait();
		display_point();
		Wait();
    }
	while(1);
}