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DoubleBuffer

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jdevelay

Post subject: DoubleBuffer

Posted: Mon May 29, 2006 17:23

Joined: Mon May 29, 2006 17:12
Posts: 1

Hello

I develop a drivers for t6963c controllers. I try to develop a doublebuffer.
However i don't understand this specification.

I tested by writing in RAM an image :

example :

#define frontbuffer 0x0000
#define backbuffer 0x0850

and used that to display

Code:

void InitBuffer(int buffer)
{
   if(buffer==0)
   {
      G_BASE=0x0000;
      /* SET GRAPHICS HOME ADDR */
      WriteData(G_BASE & 0xFF);  // Data1: LowAddress graphic home addr
      WriteData(G_BASE >> 8);    // Data2: HighAddress
      WriteCtrl(SET_GRAPHICS_HOME_ADDR);           // Command: 0x42 -> 01000010
   }
   if(buffer==1)
   {   
      G_BASE=0x0850;
      /* SET GRAPHICS HOME ADDR */
   WriteData(G_BASE & 0xFF);  // Data1: LowAddress graphic home addr
   WriteData(G_BASE >> 8);    // Data2: HighAddress
   WriteCtrl(SET_GRAPHICS_HOME_ADDR);           // Command: 0x42 -> 01000010
   }
}

i think it is false...

someone , use doublebuffer for t6963c?

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Zee

Post subject:

Posted: Mon May 29, 2006 18:34

Joined: Wed Aug 03, 2005 20:27
Posts: 130
Location: .fi

You're meant to use it so that you:

1) Clear the backbuffer and call InitBuffer(1).
2) You clear the frontbuffer and do your stuff into it, and when you're done you call InitBuffer(0) to set the frontbuffer visible on the screen.
3) You clear the backbuffer, do your stuff into that, and when done you call InitBuffer(1) to set that visible on the screen.
4) Loop back to position #2.

This is to get rid off of all the visible effects of drawing in the screen.

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