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Graphics mode CFAG12832A st7920 controller

drew30

New member
Hi, does anyone have any ideas on what I may doing wrong? I am using the crystafontz CFAG12832A with st7920 controller, whenever I enable the graphics mode all I get is garbage on the screen and I can't seem to write to or clear the screen in graphics mode. It would be greatly appreciated I have been able to follow the data sheet only to get the characters in basic mode but my goal is to use only graphics? Thanks
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CF Support

Administrator
Here's some code that should work for initializing that display:

Code:
  //Talk to the control register.
  CLR_RS;

  //Function Set
  DATA(0x30);
  SET_E;
  Sleep(0);
  CLR_E;

  Sleep(1);


  //Display on
  DATA(0x0C);
  SET_E;
   Sleep(0);
 CLR_E;

   Sleep(1);

  // Clear display
  DATA(0x01);
  SET_E;
  Sleep(0);
  CLR_E;

  Sleep(1);

  //Set Entry mode
  DATA(0x06);
  SET_E;
  Sleep(0);
  CLR_E;
  Sleep(1);

// end initialization
	SET_RS;

  // Set Extended function set
	CLR_RS;
  DATA(0x30);
  SET_E;
  Sleep(0);
  CLR_E;

  DATA(0x32);
  SET_E;
  Sleep(0);
  CLR_E;

  DATA(0x36);
  SET_E;
  Sleep(0);
  CLR_E;
The timings may need to be changed, but the order is correct.
 

drew30

New member
Thank You very much for the info, I have been able to write to the display, now I guess I need to work on building my own library
 
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