51 MCU 12864 dot program

void curve(unsigned char xlable,unsigned char ylable,bit dot)
{
 unsigned char H[1]={0};//Read RAM register
 unsigned char L[1]={0};
 unsigned char xbuf;

 w_com(0x01); 
 w_com(0x34); 
 w_com(0x36); //Function setting: send 8 bits of data at a time, extended instruction set

 xlable=xlable+xoffset; //find the relative zero point
 ylable=ylable+yoffset;

 if(xlable<0)xlable=-1;//out of boundary processingif(
 ylable<0)ylable=0;
 if(ylable>64)ylable=65;
 
 xbuf=xlable%16;
 xlable=xlable/16;
 if(ylable>32)//upper half screen
 {
  ylable=64-ylable;//switch upper and lower screensxbuf
  =15-xbuf;//x coordinate returnw_com
  (0x80|ylable); //input vertical addressw_com
  (0x80|xlable); //input horizontal addressread_RAM
  ();//shieldif
  (xbuf>7)
  {
   if(dot==0)
    H[0]=read_RAM()&(~(1<   H 
    [0]=read_RAM()|1<    [0]=read_RAM();
  }
  else
  {
   H[0]=read_RAM();//Insert dots, dots that need to be inserted
   if(dot==0)
    L[0]=read_RAM()&(~(1<   else
    L[0]=read_RAM()|1<  }
  w_com(0x80|ylable); //Input vertical address
  w_com(0x80|xlable); //Input horizontal address
  w_byte(H[0]);
  w_byte(L[0]);
 }
 else //Lower half screen
 {
  ylable=32-ylable;
  xbuf=15-xbuf;//x coordinate returns to position
  w_com(0x80|ylable); //Input vertical address
  w_com(0x88|xlable); //Input horizontal address
  read_RAM();//Shield
  if(xbuf>7)
  {
   if(dot==0)
    H[0]=read_RAM()&(~(1<   else
    H[0]=read_RAM()|1<   L[0]=read_RAM();
  }
  else
  {
   H[0]=read_RAM();//Insert dot, the dot that needs to be marked
   if(dot==0)
    L[0]=read_RAM()&(~(1<   else
   L[0]=read_RAM()|1<  }
  w_com(0x80|ylable); //Input vertical address
  w_com(0x88|xlable); //Input horizontal address
  w_byte(H[0]);
  w_byte(L[0]);
 }
}

//Clear screen
void BMP_clear( void )
{
     unsigned char i,j;unsigned char L[1]={0};
     w_com(0x34); //8Bit extended instruction set, even if it is 36H, you have to write it twice
     w_com(0x36); //Drawing ON, in the basic instruction set, 36H cannot turn on drawing
     for(i=0;i<32;i++) //12864 is actually 256x32
     {
   
           w_com(0x80|i); //Row position
           w_com(0x80); //Column position
           for(j=0;j<32;j++) //256/8=32 byte
              w_byte(L[0]);
 }
}