vportcap.c

这是一个测试德州仪器公司新出一款DSP642处理器程序

/********************************************************************/
/*  Copyright 2004 by SEED Incorporated.							*/
/*  All rights reserved. Property of SEED Incorporated.				*/
/*  Restricted rights to use, duplicate or disclose this code are	*/
/*  granted through contract.									    */
/*  															    */
/********************************************************************/
/*以下的程序是用DMA方式采集图的的设置、中断、以及数据传输的函数*/
/**********************************************************/
/* Capture parameter definitions based on 525/60 format */
/**********************************************************/
/*NTSC*/
//#define VCB_HBLNK_SIZE 138 /* (858-720),horizontal blanking */
//#define VCB_IMG_VSIZE1 244 /* (263-20+1), fld1 vertical image size */
//#define VCB_IMG_VSIZE2 243 /* (525-283+1), fld2 vertical image size */

/*PAL*/
#define VCB_HBLNK_SIZE 144 /* (864-720),horizontal blanking */
/*确定第一场图像的重直像素为288*/
#define VCB_IMG_VSIZE1 288 /* (311-24+1), fld1 vertical image size */
/*确定第一场图像的重直像素为288*/
#define VCB_IMG_VSIZE2 288 /* (625-338+1), fld2 vertical image size */

/*确定第一场图像的水平像素为720*/
#define VCB_IMG_HSIZE1 720 /* field1 horizontal image size */
/*确定第二场图像的水平像素为720*/
#define VCB_IMG_HSIZE2 720 /* field2 horizontal image size */

/* 确定一场像素的大小为720×288 */
#define VCB_IMAGE_SIZE1 (VCB_IMG_HSIZE1 * VCB_IMG_VSIZE1)
/* 确定二场像素的大小为720×288 */
#define VCB_IMAGE_SIZE2 (VCB_IMG_HSIZE2 * VCB_IMG_VSIZE2)
/* Define threshold values in double.words. Both fields should have same threshold value*/
/* 确定FIFO的事件的门槛，为一行的长度，因为DM642为64位DMA，所以长度/8 */
#define VCB_VDTHRLD1 (VCB_IMG_HSIZE1/8) /* line length in */
#define VCB_VDTHRLD2 VCB_VDTHRLD1 /* double.words */
/* ....................................................... */
/* Define channel A capture window co-ordinates for Field1 */
/* ....................................................... */
/*设置图像的采集框*/
/* HRST = 0, start of horizontal blanking，HCOUNT在EAV后复位
   即一行是从EAV之后开始 ，那行消隐在前，图像在后*/
#define VCB_XSTART1 (VCB_HBLNK_SIZE-2)/*EAV*/
#define VCB_XSTOP1 (VCB_XSTART1 + VCB_IMG_HSIZE1-1)
/* VRST = 1, end of vertical blanking */
#define VCB_YSTART1 1
#define VCB_YSTOP1 (VCB_YSTART1 + VCB_IMG_VSIZE1-1)

/* ....................................................... */
/* Define channel A capture window co-ordinates for Field2 */
/* ....................................................... */
/* HRST = 0, start of horizontal blanking */
#define VCB_XSTART2 (VCB_HBLNK_SIZE-2/*EAV*/)
#define VCB_XSTOP2 (VCB_XSTART2 + VCB_IMG_HSIZE2-1)
/* VRST = 1, end of vertical blanking */
#define VCB_YSTART2 1
#define VCB_YSTOP2 (VCB_YSTART2 + VCB_IMG_VSIZE2-1)

/* Define threshold values in double-words. Both fields should same threshold value */
/* 确定FIFO触发的长度*/
#define VCB_THRLD_FIELD1 (VCB_IMG_HSIZE1/8) /* line length in */
#define VCB_THRLD_FIELD2 VCB_THRLD_FIELD1 /* double-words */

/* Define number of events to be generated for field1 and field2 
   定义奇场（244）与偶场的行数（243）*/
#define VCB_CAPEVT1 (VCB_IMAGE_SIZE1 / (VCB_VDTHRLD1 * 8))
#define VCB_CAPEVT2 (VCB_IMAGE_SIZE2 / (VCB_VDTHRLD2 * 8))
/* in this example 定义采1帧  */
#define CAPCHA_FRAME_COUNT 1 
/* ............................................ */
/* EDMA parameters for capture Y event that are */
/* specific to this example. */
/* ............................................ */

/* because VCB_THRLD_FIELDn is in double-words and element size is 32-bit */
#define VCB_Y_EDMA_ELECNT (VCB_THRLD_FIELD1 * 2) 

#define VCB_Y_EDMA_FRMCNT ((VCB_CAPEVT1 + VCB_CAPEVT2) * CAPCHA_FRAME_COUNT)
/******************************************************************/
/* Description : 8.bit BT.656 non.continuous frame capture 		  */
/* 																  */
/* Some important field descriptions:                             */
/*                                                                */
/* CMODE = 000, 8.bit BT.656 mode                                 */
/* CON = 0                                                        */
/* FRAME = 1, capture frame                                       */
/* CF2 = 0                                                        */
/* CF1 = 0, (8-bit non.continuous frame capture)                  */
/* SCALE = 0, no scaling                                          */
/* RESMPL= 0, no resampling                                       */
/* 10BPK = X, not used in 8-bit capture                           */
/* EXC = 0, use EAV/SAV codes                                     */
/* VRST = 1, end of vertical blanking                             */
/* HRST = 0, start of horizontal blanking                         */
/* FLDD = 0, 1st line EAV or FID input                            */
/* FINV = 0, no field invert                                      */
/* RDFE = X, used in Raw mode only(Enable field identification)   */
/* SSE = X, used in Raw mode only(Startup synch enable)           */
/******************************************************************/
#include <vportcap.h>
/*................................................................ */
/* global variable declarations 								   */
/* ............................................................... */

	#pragma DATA_SECTION(capChaAYSpace, ".capChaAYSpace") 
	/* buffer to store captured Y-data */
	Uint8 capChaAYSpace[720*588]; 
	#pragma DATA_SECTION(capChaACbSpace, ".capChaACbSpace")
	/* buffer to store captured Cb-data */
	Uint8 capChaACbSpace[360*588]; 
	#pragma DATA_SECTION(capChaACrSpace, ".capChaACrSpace")
	/* buffer to store captured Cr-data */
	Uint8 capChaACrSpace[360*588];
	
	/* handle of vp that to be configured */
	VP_Handle vpCaptureHandle; 
	/*设置Y、Cb、Cr的EDMA通路的句柄*/ 
	EDMA_Handle hEdmaVPCapChaAY;
	EDMA_Handle hEdmaVPCapChaACb;
	EDMA_Handle hEdmaVPCapChaACr;
	
	/* EDMA tcc for Y channel */
	Int32 edmaCapChaAYTccNum = 0; 
	/* EDMA tcc for Cb channel */
	Int32 edmaCapChaACbTccNum = 0;
	/* EDMA tcc for Cb channel */ 
	Int32 edmaCapChaACrTccNum = 0;
	
	/* no of frames captured */ 
	volatile Uint32 capChaAFrameCount = 0; 
	
	/* Error flags */
	volatile Uint32 capChaAOverrun = 0;
	volatile Uint32 capChaASyncError = 0;
	volatile Uint32 capChaAShortFieldDetect = 0;
	volatile Uint32 capChaALongFieldDetect = 0;
	volatile Uint32 capNewFrame = 0;
/*******************************************************************/
/* Function : bt656_8bit_ncfc 									   */
/* Input(s) : portNumber, video port number i.e. 0, 1 or 2.        */
/* Description : Configures given video port for 8.bit BT.656 non. */
/* continuos frame capture on channel A.                           */
/*******************************************************************/
VP_Handle bt656_8bit_ncfc( int portNumber)
{
	/* Open video port for capture ,打开一个视频端口*/
	vpCaptureHandle = VP_open(portNumber, VP_OPEN_RESET);
	if(vpCaptureHandle == INV)
	{
		return (VP_Handle)0xffff;
	}
	/*将VP2设置为双通路*/
	VP_FSETH(vpCaptureHandle,VPCTL,DCHNL,VP_VPCTL_DCHNL_OF(1));
	/* Enable video port functionality in VP Peripheral Control Reg(PCR)，使能视频端口*/
	VP_FSETH(vpCaptureHandle, PCR, PEREN, VP_PCR_PEREN_ENABLE);
	/* ..................... */
	/* Enable all interrupts */
	/* ..................... */
	/*便能VCB的中断源*/
	/* Enable capture overrun interrupt(COVRA) for VP channel B */
	VP_FSETH(vpCaptureHandle, VPIE, COVRB, VP_VPIE_COVRB_ENABLE);
	/* Enable capture complete interrupt(CCMPA) for VP channel B */
	VP_FSETH(vpCaptureHandle, VPIE, CCMPB, VP_VPIE_CCMPB_ENABLE);
	/* Enable channel synchronization error interrupt(SERRA) for VP channel B */
	VP_FSETH(vpCaptureHandle, VPIE, SERRB, VP_VPIE_SERRB_ENABLE);
	/* Enable short field detect interrupt(SFDA) for VP channel B */
	VP_FSETH(vpCaptureHandle, VPIE, SFDB, VP_VPIE_SFDB_ENABLE);
	/* Enable video port global interrupt enable */
	VP_FSETH(vpCaptureHandle, VPIE, VIE, VP_VPIE_VIE_ENABLE);
	/* ...................... */
	/* Setup all other fields */
	/* ...................... */
	
	/* Enable short field detect，使能缺场探测*/
	VP_FSETH(vpCaptureHandle, VCBCTL, SFDE, VP_VCBCTL_SFDE_ENABLE);
	/* Set last pixel to be captured in Field1 (VCB_STOP1 reg) */
	/*设置第一场的最后一个像素的Y轴与X轴的坐标*/
	VP_RSETH(vpCaptureHandle, VCBSTOP1,VP_VCBSTOP1_RMK(VCB_YSTOP1, VCB_XSTOP1));
	/* Set last pixel to be captured in Field2 (VCB_STOP2 reg) */
	/*设置第二场的最后一个像素的Y轴与X轴的坐标*/
	VP_RSETH(vpCaptureHandle, VCBSTOP2,VP_VCBSTOP2_RMK(VCB_YSTOP2, VCB_XSTOP2));
	/* Set first pixel to be captured in Field1 (VCB_STRT1 reg) */
	/*设置第一场的第一个像素的Y轴与X轴的坐标*/
	VP_RSETH(vpCaptureHandle, VCBSTRT1, VP_VCBSTRT1_RMK(VCB_YSTART1,VP_VCBSTRT1_SSE_ENABLE, VCB_XSTART1));
	/* Set first pixel to be captured in Field2 (VCB_STRT2 reg) */
	/*设置第二场的第一个像素的Y轴与X轴的坐标*/
	VP_RSETH(vpCaptureHandle, VCBSTRT2,VP_VCBSTRT2_RMK(VCB_YSTART2, VCB_XSTART2));
	/* Set threshold values ，设置EDMA启动的门限*/
	VP_RSETH(vpCaptureHandle, VCBTHRLD,VP_VCBTHRLD_RMK(VCB_THRLD_FIELD2, VCB_THRLD_FIELD1));
	/* Set capture event.register values，设置一场的需要的EDMA的次数 */
	VP_RSETH(vpCaptureHandle, VCBEVTCT,VP_VCBEVTCT_RMK(VCB_CAPEVT2,VCB_CAPEVT1));
	/* Vertical interrupts (VCB_INT) are not enabled in this example. */
	/* Set CMODE to 8.bit BT.656，采用BT656格式的数据流 */
	VP_FSETH(vpCaptureHandle, VCBCTL, CMODE, VP_VCBCTL_CMODE_BT656B);
	/* Set non.continuous frame capture，设置为电视显示格式的采集，即不连续的采集，
	   CON/FRAME/CF2/CF1的值为0100 */
	VP_FSETH(vpCaptureHandle, VCBCTL, CON, VP_VCBCTL_CON_DISABLE);
	VP_FSETH(vpCaptureHandle, VCBCTL, FRAME, VP_VCBCTL_FRAME_FRMCAP);
	VP_FSETH(vpCaptureHandle, VCBCTL, CF2, VP_VCBCTL_CF2_NONE);
	VP_FSETH(vpCaptureHandle, VCBCTL, CF1, VP_VCBCTL_CF1_NONE);
	/* Let FLDD and FINV to be their defaults */
	/* Set VRST to end of vertical blanking,VCOUNT复位在场消隐之后 */
	VP_FSETH(vpCaptureHandle, VCBCTL, VRST, VP_VCBCTL_VRST_V0EAV);
	/* Set HRST to start of horizontal blanking，行计数复位在EAV之后 */
	VP_FSETH(vpCaptureHandle, VCBCTL, HRST, VP_VCBCTL_HRST_OF(0));
	/* 10.bit pack mode(10BPK bit) in this 8.bit example */
	/* No (1/2) scaling and no chroma re.sampling in this example */
	/*初始化EDMA通路*/
	IRQ_enable(IRQ_EVT_VINT2);
	/* Enable video port interrupts */
	IRQ_enable(vpCaptureHandle->eventId);
	/* Setup Y, Cb and Cr EDMA channels */
	setupVPCapChaAEDMA(portNumber);
	/* Clear VPHLT in VP_CTL to make video port function，清除VPHLT位?
	   使能其它位 */
	VP_FSETH(vpCaptureHandle, VPCTL, VPHLT, VP_VPCTL_VPHLT_CLEAR);
	/* .............. */
	/* enable capture */
	/* .............. */
	/* set VCEN bit to enable capture，使能VCB口 */
	VP_FSETH(vpCaptureHandle, VCBCTL, VCEN, VP_VCBCTL_VCEN_ENABLE);