注：程序不完整，只是涉及到我的问题的部分
//////////////////////////////
/*采集与显示缓冲区的首址*/
Uint32 capYbuffer  = 0x80000000;
Uint32 capCbbuffer = 0x800675c0;
Uint32 capCrbuffer = 0x8009b0a0;

Uint32 disYbuffer  = 0x80100000;
Uint32 disCbbuffer = 0x801675c0; 
Uint32 disCrbuffer = 0x8019b0a0;

Uint32 tempSrcYbuffer    = 0x80200000;   //临时
Uint32 tempDisYbuffer    = 0x80300000;   //临时
///////////////////////////////////////////

	/*将Vedio Port1设为采集输入*/
	portNumber = 1;
	vpHchannel1 = bt656_8bit_ncfc(portNumber);
	bt656_capture_start(vpHchannel1);
	/*等待第一帧数据采集完成*/
	while(capNewFrame == 0){}
	/*将数据存入显示缓冲区，并清采集完成的标志*/
	capNewFrame =0;
	for(i=0;i<numLines;i++)
	{
		/*传送临时Y缓冲区*/
		DAT_copy((void *)(capYbuffer + i * numPixels), 
	             (void *)(tempSrcYbuffer + i * numPixels),
	             numPixels);
		/*传送临时Y缓冲区*/
		DAT_copy((void *)(capYbuffer + i * numPixels), 
	             (void *)(tempDisYbuffer + i * numPixels),
	             numPixels);	             	  	 
	 }

	/*Sobel边缘检测处理*/
    sobelEdge(); 

    /*画边框*/    
    drawRectangle();
	 
	for(i=0;i<numLines;i++)
	{
		/*传送Y缓冲区*/
		DAT_copy((void *)(tempDisYbuffer + i * numPixels), 
	             (void *)(disYbuffer + i * numPixels),
	             numPixels);
	 }	 
	
	//清除彩色信号  
	for(i=0;i<0x33ae0;i++)
	{
	    *((Uint8 *)(disCrbuffer +i)) =0x80;
	    *((Uint8 *)(disCbbuffer +i)) =0x80;

	} 
	 
	 
	/*启动显示模块*/
	bt656_display_start(vpHchannel0);
	/*建立显示的实时循环*/
	for(;;)
	{
		/*当采集区的数据已经采集好，而显示缓冲区的数据已空*/
		if((capNewFrame == 1)&&(disNewFrame == 1))
		{
			/*将数据装入显示缓冲区，并清采集完成的标志*/
			capNewFrame =0;
			disNewFrame =0;
			for(i=0;i<numLines;i++)
			{
				/*传送临时Y缓冲区*/
DAT_copy((void *)(capYbuffer + i * numPixels), 
	 (void *)(tempSrcYbuffer + i * numPixels),
			             numPixels);
 			  	/*传送临时Y缓冲区*/
				DAT_copy((void *)(capYbuffer + i * numPixels), 
			             (void *)(tempDisYbuffer + i * numPixels),
			             numPixels);
			 }

		    			 
			/*Sobel边缘检测处理*/
            sobelEdge(); 			 

		    /*画边框*/    
		    drawRectangle();
		    			 
			for(i=0;i<numLines;i++)
			{
				/*传送Y缓冲区*/
				DAT_copy((void *)(tempDisYbuffer + i * numPixels), 
			             (void *)(disYbuffer + i * numPixels),
			             numPixels);		
			 }
		}
		
	}
	
	for(;;)
	{}
/*----------------------------------------------------------*/
	/*采集与回放*/	
}