12864 dots controlled by st7920-EEWORLD

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You can mark it at any position. I would like to thank those kind people who explained the places where problems are likely to occur. Be sure to read DATESHEET carefully for the convenience of future generations.
   1. Positioning of dot position
   2. Reading currently displayed data
   3. Or and shift, i.e. rewriting new data
The program is as follows:
void GUI_Point(uchar x,uchar y,uchar flag)
{
  uchar x_Dyte,x_byte; //Define the byte position of the column address, and which bit in the byte
  uchar y_Dyte,y_byte; //Define as upper and lower screens (values are 0, 1), row address (values are 0~31)
  Write_command(0x36); //Drawing mode command
  /***X,Y coordinates are interchanged, i.e. ordinary X,Y coordinates***/
  x_Dyte=y/16; //Calculate which one of the 16 bytes
  x_byte=y&0x0f; //Calculate which bit in the byte
  y_Dyte=x/32; //0 is the upper half of the screen, 1 is the lower half of the screen
  y_byte=x&0x1f; //Calculate which row among 0~31

  Write_command(0x80+y_byte); //Set the row address (y coordinate)
  Write_command(0x80+x_Dyte+8*y_Dyte); //Set the column address (x coordinate), and select the upper and lower screens through 8*y_DyteRead_data

  ();
  GDRAM_hbit=Read_data(); //Read the current display high 8-bit
  dataGDRAM_lbit=Read_data(); //Read the current display low 8-bit datadelay_us
  (5);

  if(flag==1)
  {
  Write_command(0x80+y_byte); //Set the row address (y coordinate)
  Write_command(0x80+x_Dyte+8*y_Dyte); //Set the column address (x coordinate), and select the upper and lower screens through 8*y_Dytedelay_us
  (5);
if(x_byte<8) //Judge whether it is in the upper 8 bits or the lower 8 bits
  {
Write_data(GDRAM_hbit|(0X01<<(7-x_byte))); //Display the upper 8-bit data of GDRAM area
Write_data(GDRAM_lbit); //Display the lower 8-bit data of GDRAM area
}
else
{
Write_data(GDRAM_hbit);
Write_data(GDRAM_lbit|(0x01<<(15-x_byte)));
}
  }
  else
  {
  Write_data(0x00)); //Clear the upper 8-bit data of GDRAM area
  Write_data(0x00)); //Clear the lower 8-bit data of GDRAM area
  }
} /**********Read the LCD

display data of the current address **********/ uchar Read_data() { uchar shuju; LCD_DATA_set_in; // Set port PB to input LCD_DATA_PORT=0xff; SET_DI; // D/I=1, represents data SET_RW; // R/W=1.Read delay_us(10); SET_E; delay_us(100); shuju=PINB; //Read the currently displayed data CLR_E; return(shuju); }

Reference address：12864 dots controlled by st7920

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