www.pudn.com > Grayscale.rar > vportcapb.c

/********************************************************************/ 
/*  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 VCA_HBLNK_SIZE 138 /* (858-720),horizontal blanking */ 
//#define VCA_IMG_VSIZE1 244 /* (263-20+1), fld1 vertical image size */ 
//#define VCA_IMG_VSIZE2 243 /* (525-283+1), fld2 vertical image size */ 
 
/* (EAV/SAV inclusive) */ 
//#define VCA_VBLNK1_SIZE 19 /* (20-1),v.blanking for field1 */ 
//#define VCA_VBLNK2_SIZE 19 /* (283-264),v.blanking for field2 */ 
 
/*PAL*/ 
#define VCA_HBLNK_SIZE 144 /* (864-720),horizontal blanking */ 
/*确定第一场图像的水平像素为720*/ 
#define VCA_IMG_HSIZE1 720 /* field1 horizontal image size */ 
/*确定第一场图像的重直像素为288*/ 
#define VCA_IMG_VSIZE1 288 /* (311-24+1), fld1 vertical image size */ 
 
/*确定第二场图像的水平像素为720*/ 
#define VCA_IMG_HSIZE2 720 /* field2 horizontal image size */ 
/*确定第一场图像的重直像素为288*/ 
#define VCA_IMG_VSIZE2 288 /* (625-338+1), fld2 vertical image size */ 
 
/* 确定一场像素的大小为720×288 */ 
#define VCA_IMAGE_SIZE1 (VCA_IMG_HSIZE1 * VCA_IMG_VSIZE1) 
/* 确定二场像素的大小为720×288 */ 
#define VCA_IMAGE_SIZE2 (VCA_IMG_HSIZE2 * VCA_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 VCA_VDTHRLD1 (VCA_IMG_HSIZE1/8) /* line length in */ 
#define VCA_VDTHRLD2 VCA_VDTHRLD1 /* double.words */ 
/* ....................................................... */ 
/* Define channel A capture window co-ordinates for Field1 */ 
/* ....................................................... */ 
/* HRST = 0, start of horizontal blanking */ 
#define VCA_XSTART1 (VCA_HBLNK_SIZE-2/*EAV*/) 
/* VRST = 1, end of vertical blanking */ 
#define VCA_YSTART1 1 
#define VCA_XSTOP1 (VCA_XSTART1 + VCA_IMG_HSIZE1-1) 
#define VCA_YSTOP1 (VCA_YSTART1 + VCA_IMG_VSIZE1-1) 
/* ....................................................... */ 
/* Define channel A capture window co.ordinates for Field2 */ 
/* ....................................................... */ 
/* HRST = 0, start of horizontal blanking */ 
#define VCA_XSTART2 (VCA_HBLNK_SIZE-2/*EAV*/) 
/* VRST = 1, end of vertical blanking */ 
#define VCA_YSTART2 1 
#define VCA_XSTOP2 (VCA_XSTART2 + VCA_IMG_HSIZE2-1) 
#define VCA_YSTOP2 (VCA_YSTART2 + VCA_IMG_VSIZE2-1) 
/* Define threshold values in double.words. Both fields should */ 
/* same threshold value) */ 
#define VCA_THRLD_FIELD1 (VCA_IMG_HSIZE1/8) /* line length in */ 
#define VCA_THRLD_FIELD2 VCA_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 VCA_CAPEVT1 (VCA_IMAGE_SIZE1 / (VCA_VDTHRLD1 * 8)) 
#define VCA_CAPEVT2 (VCA_IMAGE_SIZE2 / (VCA_VDTHRLD2 * 8)) 
/* in this example 定义采5帧  */ 
#define CAPCHA_FRAME_COUNT 5  
/* ............................................ */ 
/* EDMA parameters for capture Y event that are */ 
/* specific to this example. */ 
/* ............................................ */ 
 
/* because VCA_THRLD_FIELDn is in double.words and element size is 32.bit */ 
#define VCA_Y_EDMA_ELECNT (VCA_THRLD_FIELD1 * 2)  
 
#define VCA_Y_EDMA_FRMCNT ((VCA_CAPEVT1 + VCA_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  
/*................................................................ */ 
/* global variable declarations */ 
/* ............................................................... */ 
	 
	#pragma DATA_SECTION(capChaAYSpace, ".capChaAYSpace")  
	/* buffer to store captured Y-data */ 
	Uint8 capChaAYSpace[720*244];  
	#pragma DATA_SECTION(capChaACbSpace, ".capChaACbSpace") 
	/* buffer to store captured Cb-data */ 
	Uint8 capChaACbSpace[360*244];  
	#pragma DATA_SECTION(capChaACrSpace, ".capChaACrSpace") 
	/* buffer to store captured Cr-data */ 
	Uint8 capChaACrSpace[360*244]; 
	/* 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; 
/*******************************************************************/ 
/* 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; 
	} 
	/**/ 
	 
	/* 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VCA的中断源*/ 
	/* Enable capture overrun interrupt(COVRA) for VP channel A */ 
	VP_FSETH(vpCaptureHandle, VPIE, COVRA, VP_VPIE_COVRA_ENABLE); 
	/* Enable capture complete interrupt(CCMPA) for VP channel A */ 
	VP_FSETH(vpCaptureHandle, VPIE, CCMPA, VP_VPIE_CCMPA_ENABLE); 
	/* Enable channel synchronization error interrupt(SERRA) for */ 
	/* VP channel A */ 
	VP_FSETH(vpCaptureHandle, VPIE, SERRA, VP_VPIE_SERRA_ENABLE); 
	/* Enable short field detect interrupt(SFDA) for VP channel A */ 
	VP_FSETH(vpCaptureHandle, VPIE, SFDA, VP_VPIE_SFDA_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, VCACTL, SFDE, VP_VCACTL_SFDE_ENABLE); 
	/* Set last pixel to be captured in Field1 (VCA_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, VCASTOP1,VP_VCASTOP1_RMK(VCA_YSTOP1, VCA_XSTOP1)); 
	/* Set last pixel to be captured in Field2 (VCA_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, VCASTOP2,VP_VCASTOP2_RMK(VCA_YSTOP2, VCA_XSTOP2)); 
	/* Set first pixel to be captured in Field1 (VCA_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, VCASTRT1, VP_VCASTRT1_RMK(VCA_YSTART1,VP_VCASTRT1_SSE_ENABLE, VCA_XSTART1)); 
	/* Set first pixel to be captured in Field2 (VCA_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, VCASTRT2,VP_VCASTRT2_RMK(VCA_YSTART2, VCA_XSTART2)); 
	/* Set threshold values ，设置EDMA启动的门限*/ 
	VP_RSETH(vpCaptureHandle, VCATHRLD,VP_VCATHRLD_RMK(VCA_THRLD_FIELD2, VCA_THRLD_FIELD1)); 
	/* Set capture event.register values，设置一场的需要的EDMA的次数 */ 
	VP_RSETH(vpCaptureHandle, VCAEVTCT,VP_VCAEVTCT_RMK(VCA_CAPEVT2,VCA_CAPEVT1)); 
	/* Vertical interrupts (VCA_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, VCACTL, CMODE, VP_VCACTL_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, VCACTL, CON, VP_VCACTL_CON_DISABLE); 
	VP_FSETH(vpCaptureHandle, VCACTL, FRAME, VP_VCACTL_FRAME_FRMCAP); 
	VP_FSETH(vpCaptureHandle, VCACTL, CF2, VP_VCACTL_CF2_NONE); 
	VP_FSETH(vpCaptureHandle, VCACTL, CF1, VP_VCACTL_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, VCACTL, VRST, VP_VCACTL_VRST_V0EAV); 
	/* Set HRST to start of horizontal blanking，行计数复位在EAV之后 */ 
	VP_FSETH(vpCaptureHandle, VCACTL, HRST, VP_VCACTL_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_VINT1); 
	/* 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VCA口 */ 
	VP_FSETH(vpCaptureHandle, VCACTL, VCEN, VP_VCACTL_VCEN_ENABLE); 
	/* clear BLKCAP in VCA_CTL to enable capture DMA events */ 
	VP_FSETH(vpCaptureHandle, VCACTL, BLKCAP,VP_VCACTL_BLKCAP_CLEAR); 
	 
	return (vpCaptureHandle); 
} 
/*******************************************************************/ 
/* Function : bt656_capture_start    							   */ 
/* Input(s) : VP_handle									           */ 
/* Description : Configures given video port for 8.bit BT.656 non. */ 
/* continuos frame capture on channel A.                           */ 
/*******************************************************************/ 
void bt656_capture_start(VP_Handle videoHandle) 
{	 
} 
/*................................................................ */ 
/* Function : VPCapChaAIsr */ 
/* Description : This capture ISR clears FRMC to continue capture */ 
/* in this non.continuous mode and also clears other */ 
/* status bits. */ 
/*................................................................ */ 
interrupt void VPCapChaAIsr(void) 
{ 
	Uint32 vpis = 0; 
	/* Get video port status register value */ 
	vpis = VP_RGETH(vpCaptureHandle, VPIS); 
	if(vpis & _VP_VPIS_CCMPA_MASK) /* capture complete */ 
	{ 
		/* Clear frame complete bit in VCX_CTL to continue capture in non.continuous mode*/ 
		VP_FSETH(vpCaptureHandle, VCASTAT, FRMC,VP_VCASTAT_FRMC_CLEAR); 
		/* Clear CCMPA to enable next frame complete interrupts*/ 
		VP_FSETH(vpCaptureHandle, VPIS, CCMPA,VP_VPIS_CCMPA_CLEAR); 
		capChaAFrameCount++; /* increment captured frame count */ 
	} 
	if(vpis & _VP_VPIS_COVRA_MASK) /* overrun error */ 
	{ 
		capChaAOverrun++; 
		VP_FSETH(vpCaptureHandle, VPIS, COVRA,VP_VPIS_COVRA_CLEAR); 
	} 
	if(vpis & _VP_VPIS_SERRA_MASK) /* synchronization error */ 
	{ 
		capChaASyncError++; 
		VP_FSETH(vpCaptureHandle, VPIS, SERRA,VP_VPIS_SERRA_CLEAR); 
	} 
	if(vpis & _VP_VPIS_SFDA_MASK) /* short field detect */ 
	{ 
		capChaAShortFieldDetect++; 
		VP_FSETH(vpCaptureHandle, VPIS, SFDA, VP_VPIS_SFDA_CLEAR); 
	} 
	if(vpis & _VP_VPIS_LFDA_MASK) /* long field detect */ 
	{ 
		capChaALongFieldDetect++; 
		VP_FSETH(vpCaptureHandle, VPIS, LFDA, VP_VPIS_LFDA_CLEAR); 
	} 
} 
/*................................................................ */ 
/* Function : setupVPCapChaAEDMA(Int32 portNumber) */ 
/* Input(s) : portNumber, video port number i.e. 0, 1 or 2. */ 
/* Description : Sets up EDMA channels for Y, U, V events for */ 
/* channel A capture. */ 
/*功能描述：将为Y，U，V建立EDMA的通路*/ 
/*................................................................ */ 
void setupVPCapChaAEDMA(int portNumber) 
{ 
	Int32 YEvent, UEvent, VEvent; 
	/* get channelA Y, U, V EDMA event numbers，选择触发事件 */ 
	switch(portNumber) 
	{ 
		/*确定相应的DMA通路*/ 
		case VP_DEV0:  
			YEvent = EDMA_CHA_VP0EVTYA; 
			UEvent = EDMA_CHA_VP0EVTUA; 
			VEvent = EDMA_CHA_VP0EVTVA; 
			break; 
		case VP_DEV1:  
			YEvent = EDMA_CHA_VP1EVTYA; 
			UEvent = EDMA_CHA_VP1EVTUA; 
			VEvent = EDMA_CHA_VP1EVTVA; 
			break; 
		case VP_DEV2:  
			YEvent = EDMA_CHA_VP2EVTYA; 
			UEvent = EDMA_CHA_VP2EVTUA; 
			VEvent = EDMA_CHA_VP2EVTVA; 
			break; 
	} 
	/* Configure Y EDMA channel to move data from YSRCA */ 
	/* (FIFO) to Y.data buffer, capChaAYSpace */ 
	configVPCapEDMAChannel( &hEdmaVPCapChaAY, YEvent, 
							&edmaCapChaAYTccNum, 
							vpCaptureHandle->ysrcaAddr, 
							(Uint32)capChaAYSpace, 
							VCA_Y_EDMA_FRMCNT, 
							VCA_Y_EDMA_ELECNT); 
	/* Configure Cb EDMA channel to move data from CbSRCA */ 
	/* (FIFO) to Cb.data buffer, capChaACbSpace */ 
	configVPCapEDMAChannel( &hEdmaVPCapChaACb, UEvent, 
							&edmaCapChaACbTccNum, 
							vpCaptureHandle->cbsrcaAddr, 
							(Uint32)capChaACbSpace, 
							VCA_Y_EDMA_FRMCNT, 
							VCA_Y_EDMA_ELECNT/2); /* (1/2) of Y.samples */ 
	/* Configure Cr EDMA channel to move data from CrSRCA */ 
	/* (FIFO) to Cr.data buffer, capChaACrSpace */ 
	configVPCapEDMAChannel( &hEdmaVPCapChaACr, VEvent, 
							&edmaCapChaACrTccNum, 
							vpCaptureHandle->crsrcaAddr, 
							(Uint32)capChaACrSpace, 
							VCA_Y_EDMA_FRMCNT, 
							VCA_Y_EDMA_ELECNT/2); /* (1/2) of Y.samples */ 
	/* Enable three EDMA channels */ 
	EDMA_enableChannel(hEdmaVPCapChaAY); 
	EDMA_enableChannel(hEdmaVPCapChaACb); 
	EDMA_enableChannel(hEdmaVPCapChaACr); 
} 
/*................................................................ */ 
/* Function : configVPCapEDMAChannel */ 
/* */ 
/* Input(s) : edmaHandle . pointer to EDMA handle. */ 
/* eventId . EDMA eventId. */ 
/* tccNum . pointer to transfer complete number. */ 
/* srcAddr . source address for EDMA transfer. */ 
/* dstAddr . destination address for EDMA transfer */ 
/* frameCount . frame count. */ 
/* elementCount . element count(32.bit element size). */ 
/* */ 
/* Output(s): edmaHandle . edma Handle of the given event. */ 
/* tccNum . transfer complete code for the given */ 
/* event. */ 
/* */ 
/* Description : Configures the given VP capture EDMA channel. */ 
/* The source address update is fixed address mode */ 
/* because the captured data is read from the FIFO. */ 
/* In this example, the destination address mode is */ 
/* auto.increment. But, in real.time applications */ 
/* there is lot of flexibility in the way capture */ 
/* buffers can be managed like ping.pong and round */ 
/* robin,…etc. */ 
/*................................................................ */ 
void configVPCapEDMAChannel(EDMA_Handle *edmaHandle,  
							Int32 eventId, 
							Int32 *tccNum,  
							Uint32 srcAddr, 
							Uint32 dstAddr,  
							Uint32 frameCount, 
							Uint32 elementCount) 
{ 
	Int32 tcc = 0; 
	/* Open Y EVT EDMA channel */ 
	*edmaHandle = EDMA_open(eventId, EDMA_OPEN_RESET); 
	if(*edmaHandle == EDMA_HINV) 
	{ 
		for(;;){} 
	}	 
	/* allocate TCC for Y event */ 
	if((tcc = EDMA_intAlloc(-1)) == -1) 
	{ 
		for(;;){} 
	} 
	/* Configure EDMA parameters */ 
	EDMA_configArgs( 
		*edmaHandle, 
		EDMA_OPT_RMK(EDMA_OPT_PRI_MEDIUM, /* medium priority 设置优先级为中*/ 
					 EDMA_OPT_ESIZE_32BIT, /* Element size 32 bits 元素的长度为4个Byte*/ 
					 EDMA_OPT_2DS_NO, /* 1.dimensional source(FIFO) 源采用固定的方试*/ 
					 EDMA_OPT_SUM_NONE, /* fixed src address mode(FIFO) 源地址不变*/ 
					 EDMA_OPT_2DD_YES, /* 2.dimensional destination 目的采用2维空间的组成*/ 
					 EDMA_OPT_DUM_INC, /* destination increment 目的采用增长的方式*/ 
					 EDMA_OPT_TCINT_YES, /* Enable transfer complete indication，使能传送结束指示*/ 
					 EDMA_OPT_TCC_OF(tcc & 0xF),/*设置完成标志CIP0的低位*/ 
					 EDMA_OPT_TCCM_OF(((tcc & 0x30) >> 4)),/*设置完成标志CIP0的高位*/ 
					 EDMA_OPT_ATCINT_NO, /* Disable Alternate Transfers 禁止交替传送 */ 
					 EDMA_OPT_ATCC_OF(0),/* Complete Interrupt 未使用交替完标志 */ 
					 EDMA_OPT_PDTS_DISABLE, /* disable PDT(peripheral device transfer) mode for source */ 
					 EDMA_OPT_PDTD_DISABLE, /* disable PDT mode for dest */ 
					 EDMA_OPT_LINK_NO, /* Disable linking */ 
					 EDMA_OPT_FS_NO), /* Array synchronization 阵列同步*/ 
		EDMA_SRC_RMK(srcAddr),/*源地址*/ 
		EDMA_CNT_RMK(EDMA_CNT_FRMCNT_OF((frameCount-1)),/*陈列的行数*/ 
		EDMA_CNT_ELECNT_OF(elementCount)),/*每行的像素数*/ 
		EDMA_DST_RMK(dstAddr),/*目的地址*/ 
		EDMA_IDX_RMK(EDMA_IDX_FRMIDX_OF((elementCount * 4)),/*每行的增量*/ 
		         	 EDMA_IDX_ELEIDX_OF(0)), /* note: 32.bit element size */ 
		/* no RLD in 2D and no linking */ 
		EDMA_RLD_RMK(EDMA_RLD_ELERLD_OF(0), EDMA_RLD_LINK_OF(0)) 
	); 
	*tccNum = tcc;/*返回中断完成标志*/ 
}