www.pudn.com > SEED103Threshold.rar > vportdis.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.									    */ 
/*  															    */ 
/********************************************************************/ 
/* Display parameter definitions based on 625/50 format */ 
/**********************************************************/ 
/* ................. */ 
/* Define frame size */ 
/* ................. */ 
/* no of pixels per frame line including horizontal blanking*/ 
/*定义每行的像素数，包括消隐行*/ 
#define VD_FRM_WIDTH 864  
/*定义每帧的行数，包括消隐行*/ 
#define VD_FRM_HEIGHT 625 /* total noof lines per frame */ 
/*定义每帧的大小*/ 
#define VD_FRM_SIZE (VD_FRM_WIDTH * VD_FRM_HEIGHT) 
/* ................... */ 
/* Horizontal blanking */ 
/* ................... */ 
/*行消隐出现的像素位置*/ 
#define VD_HBLNK_START 720 /* starting location of EAV */ 
/*行消急结束的像素位置*/ 
#define VD_HBLNK_STOP 862 /* starting location of SAV */ 
/*消隐的像素数*/ 
#define VD_HBLNK_SIZE (VD_HBLNK_STOP - VD_HBLNK_START +2/*EAV*/) /* (138) EAV, SAV inclusive */ 
/* ............................ */ 
/* Vertical blanking for field1 */ 
/* ............................ */ 
/*奇场的场消隐设置*/ 
#define VD_VBLNK_XSTART1 720 /* pixel on which VBLNK active */ 
/* edge occurs for field1 */ 
#define VD_VBLNK_YSTART1 642 /* line on which VBLNK active */ 
/* edge occurs for field1 */ 
#define VD_VBLNK_XSTOP1 720 /* pixel on which VBLNK inactive */ 
/* edge occurs for field1 */ 
#define VD_VBLNK_YSTOP1 23 /* line on which VBLNK inactive */ 
/* edge occurs for field1 */ 
/* ............................ */ 
/* Vertical blanking for field2 */ 
/* ............................ */ 
/*偶场的场消隐设置*/ 
#define VD_VBLNK_XSTART2 360 /* pixel on which VBLNK active */ 
/* edge occurs for field2 */ 
#define VD_VBLNK_YSTART2 311 /* line on which VBLNK active */ 
/* edge occurs for field2 */ 
#define VD_VBLNK_XSTOP2 360 /* pixel on which VBLNK inactive */ 
/* edge occurs for field2 */ 
#define VD_VBLNK_YSTOP2 336 /* line on which VBLNK inactive */ 
/* edge occurs for field2 */ 
/* ................................................. */ 
/* Define vertical blanking bit(VD_VBITn) reg values */ 
/* ................................................. */ 
/*第一场重直消隐设置与清除的所在的行数*/ 
/* first line with an EAV with V=1 indicating the start of Field1 vertical blanking */ 
#define VD_VBIT_SET1 1  
/* first line with an EAV with V=0 indicating the start of Field1 active display*/ 
#define VD_VBIT_CLR1 23 
#define VD_VBLNK1_SIZE (VD_VBIT_CLR1 - VD_VBIT_SET1) /* 19 lines */ 
/*第二场重直消隐设置与清除的所在的行数*/ 
/* first line with an EAV with V=1 indicating the start of Field2 vertical blanking*/ 
#define VD_VBIT_SET2 311  
/* first line with an EAV with V=0 indicating the start of Field2 active display*/ 
#define VD_VBIT_CLR2 336  
#define VD_VBLNK2_SIZE (VD_VBIT_CLR2 - VD_VBIT_SET2) /* 19 lines */ 
/* ............ */ 
/* Field timing */ 
/* ............ */ 
/* pixel on the first line of Field1 on which FLD ouput is de-asserted*/ 
#define VD_FIELD1_XSTART 720  
/* line on which FLD is de-asserted */ 
#define VD_FIELD1_YSTART 1  
/* pixel on the first line of Field1 on which FLD ouput is asserted */ 
#define VD_FIELD2_XSTART 360 
/* line on which FLD is asserted */ 
#define VD_FIELD2_YSTART 313  
/* .................................... */ 
/* Define field bit(VD_FBIT) reg values */ 
/* .................................... */ 
#define VD_FBIT_CLR 1 /* first line with an EAV with F=0 indicating Field 1 display*/ 
#define VD_FBIT_SET 313 /* first line with an EAV with F=1 indicating Field 2 display*/ 
 
/* ................................ */ 
/* Define horzontal synchronization */ 
/* ................................ */ 
#define VD_HSYNC_START 752 
#define VD_HSYNC_STOP 782 
/* .......................................... */ 
/* Define vertical synchronization for field1 */ 
/* .......................................... */ 
#define VD_VSYNC_XSTART1 752 
#define VD_VSYNC_YSTART1 1 
#define VD_VSYNC_XSTOP1 752 
#define VD_VSYNC_YSTOP1 3 
/* .......................................... */ 
/* Define vertical synchronization for field2 */ 
/* .......................................... */ 
#define VD_VSYNC_XSTART2 320 
#define VD_VSYNC_YSTART2 313 
#define VD_VSYNC_XSTOP2 320 
#define VD_VSYNC_YSTOP2 316 
/* ........................................ */ 
/* Define image offsets for both the fields */ 
/* which are zero in this example */ 
/* ........................................ */ 
#define VD_IMG_HOFF1 0 
#define VD_IMG_VOFF1 0 
#define VD_IMG_HOFF2 0 
#define VD_IMG_VOFF2 0 
/* ................................................. */ 
/* Define image active vertical and horizontal sizes */ 
/* ................................................. */ 
#define VD_IMG_HSIZE1 720 /* field1 horizontal image size */ 
#define VD_IMG_VSIZE1 288 /* field1 vertical image size */ 
#define VD_IMG_HSIZE2 720 /* field2 horizontal image size */ 
#define VD_IMG_VSIZE2 288 /* field2 vertical image size */ 
/* Manipulate field1 and field2 image sizes */ 
#define VD_IMAGE_SIZE1 (VD_IMG_HSIZE1 * VD_IMG_VSIZE1) 
#define VD_IMAGE_SIZE2 (VD_IMG_HSIZE2 * VD_IMG_VSIZE2) 
/* Define threshold values in double-words. Both fields should */ 
/* have same threshold value */ 
#define VD_VDTHRLD1 (VD_IMG_HSIZE1/8) /* line length in */ 
#define VD_VDTHRLD2 VD_VDTHRLD1 /* double-words */ 
/* Define number of events to be generated for field1 and field2 */ 
#define VD_DISPEVT1 (VD_IMAGE_SIZE1 / (VD_VDTHRLD1 * 8)) 
#define VD_DISPEVT2 (VD_IMAGE_SIZE2 / (VD_VDTHRLD2 * 8)) 
#define DISPLAY_FRAME_COUNT 1 /* in this example */ 
/* ............................................ */ 
/* EDMA parameters for display Y event that are */ 
/* specific to this example. */ 
/* ............................................ */ 
/* VD_VDTHRLDn is in double-words and 32-bit element size */ 
#define VD_Y_EDMA_ELECNT (VD_VDTHRLD1 * 2)  
#define VD_Y_EDMA_FRMCNT ((VD_DISPEVT1 + VD_DISPEVT2) * DISPLAY_FRAME_COUNT) 
/******************************************************************/ 
/* Description : 8.bit BT.656 non.continuous frame display */ 
/* */ 
/* Some important field descriptions: */ 
/* */ 
/* DMODE = 000, 8.bit BT.656 mode */ 
/* CON = 0 */ 
/* FRAME = 1, display frame */ 
/* DF2 = 0 */ 
/* DF1 = 0, (8.bit non.continuous frame display) */ 
/* SCALE = 0, no scaling */ 
/* RESMPL = 0, no resampling */ 
/* DPK = X, not used in 8.bit display */ 
/* RSYNC = X, used in Raw mode(Enable second synchronized raw */ 
/* data channel) */ 
/* RGBX = X, used in Raw mode(RGB extract enable. Perform */ 
/* 3/4 FIFO unpacking) */ 
/* VCTL1S = 00, output HSYNC */ 
/* VCTL2S = 00, output VSYNC */ 
/* VCTL3S = 0, output CBLNK */ 
/* HXS = 0, VCTL1 is an output */ 
/* VXS = 0, VCTL2 is an output */ 
/* FXS = 0, VCTL3 is an output */ 
/* PVPSYN = 0, no previous port synchronization */ 
/******************************************************************/ 
#include  
#include "vportcap.h" 
/*................................................................ */ 
/* global variable declarations */ 
/* ............................................................... */ 
 
//	Uint32 disChaAYSpace  = 0x80000000; 
//	Uint32 disChaACbSpace = 0x800675c0;  
//	Uint32 disChaACrSpace = 0x8009b0a0; 
 
	#pragma DATA_SECTION(disChaAYSpace, ".disChaAYSpace")  
	/* buffer to store captured Y-data */ 
	Uint8 disChaAYSpace[720*588];  
	#pragma DATA_SECTION(disChaACbSpace, ".disChaACbSpace") 
	/* buffer to store captured Cb-data */ 
	Uint8 disChaACbSpace[360*588];  
	#pragma DATA_SECTION(disChaACrSpace, ".disChaACrSpace") 
	/* buffer to store captured Cr-data */ 
	Uint8 disChaACrSpace[360*588]; 
	 
	/* handle of vp that to be configured */ 
	VP_Handle vpDisplayHandle;  
	EDMA_Handle hEdmaVPDispY; 
	EDMA_Handle hEdmaVPDispCb; 
	EDMA_Handle hEdmaVPDispCr; 
	Int32 edmaDispYTccNum = 0; /* EDMA tcc for Y channel */ 
	Int32 edmaDispCbTccNum = 0; /* EDMA tcc for Cb channel */ 
	Int32 edmaDispCrTccNum = 0; /* EDMA tcc for Cb channel */ 
	volatile Uint32 displayFrameCount = 0; /* no of frames that are */ 
	/* displayed */ 
	volatile Uint32 dispUnderrun = 0; /* underrun error flag */ 
	volatile Uint32 disNewFrame =0; 
/*................................................................ */ 
/* Function : bt656_8bit_ncfd */ 
/* Input(s) : portNumber, video port number i.e. 0, 1 or 2. */ 
/* Description : Configures given video port for 8.bit BT.656 non. */ 
/* continuous frame display. */ 
/*................................................................ */ 
VP_Handle bt656_8bit_ncfd(int portNumber) 
{ 
	/* Open video port for display ，打开一个视频口*/ 
	vpDisplayHandle = VP_open(portNumber, VP_OPEN_RESET); 
	if(vpDisplayHandle == INV) 
	{ 
		return (VP_Handle)0xFFFF; 
	} 
	/*使能视频口*/ 
	/* Enable video port functionality in VP Peripheral Control Reg(PCR)*/ 
	VP_FSETH(vpDisplayHandle , PCR, PEREN, VP_PCR_PEREN_ENABLE); 
	/* Set this port to display mode，将此口设为显示模式 */ 
	VP_FSETH(vpDisplayHandle , VPCTL, DISP, VP_VPCTL_DISP_DISPLAY); 
	/* ..................... */ 
	/* Enable all interrupts */ 
	/* ..................... */ 
	/*使能相应的中断源*/ 
	/* enable display complete interrupt */ 
	VP_FSETH(vpDisplayHandle , VPIE, DCMP, VP_VPIE_DCMP_ENABLE); 
	/* enable display underrun interrupt */ 
	VP_FSETH(vpDisplayHandle , VPIE, DUND, VP_VPIE_DUND_ENABLE); 
	/* enable video port global interrupt enable */ 
	VP_FSETH(vpDisplayHandle , VPIE, VIE, VP_VPIE_VIE_ENABLE); 
	/* .................... */ 
	/* Set all other fields */ 
	/* .................... */ 
	/* set frame size ，设置显示帧的大小*/ 
	VP_RSETH(vpDisplayHandle , VDFRMSZ,VP_VDFRMSZ_RMK(VD_FRM_HEIGHT, VD_FRM_WIDTH)); 
	/*设置信号VBLNK的时序*/ 
	/* set horizontal blanking，设置水平消隐的起始位置与停止位置720～856 */ 
	VP_RSETH(vpDisplayHandle , VDHBLNK,VP_VDHBLNK_RMK(VD_HBLNK_STOP,  
													  VP_VDHBLNK_HBDLA_NONE, 
													  VD_HBLNK_START)); 
	 
	/* set vertical blanking start for field1，设置第一场的垂直消隐的位置 */ 
	VP_RSETH(vpDisplayHandle , VDVBLKS1,VP_VDVBLKS1_RMK(VD_VBLNK_YSTART1, 
														VD_VBLNK_XSTART1)); 
	/* set vertical blanking end for field1 */ 
	VP_RSETH(vpDisplayHandle , VDVBLKE1,VP_VDVBLKE1_RMK(VD_VBLNK_YSTOP1,  
													    VD_VBLNK_XSTOP1)); 
	/* set vertical blanking start for field2 ，设置第二场的垂直消隐的位置*/ 
	VP_RSETH(vpDisplayHandle , VDVBLKS2,VP_VDVBLKS2_RMK(VD_VBLNK_YSTART2,  
													    VD_VBLNK_XSTART2)); 
	/* set vertical blanking end for field2 */ 
	VP_RSETH(vpDisplayHandle , VDVBLKE2,VP_VDVBLKE2_RMK(VD_VBLNK_YSTOP2,  
														VD_VBLNK_XSTOP2)); 
	/*设置EAV与SAV中的V位的值*/ 
	/* set vertical blanking bit register for field 1(VD_VBIT1) */ 
	/*设置第一场的消隐的行数*/ 
	VP_RSETH(vpDisplayHandle , VDVBIT1,VP_VDVBIT1_RMK(VD_VBIT_CLR1,  
											    	  VD_VBIT_SET1)); 
	/* set vertical blanking bit register for field 2(VD_VBIT2) */ 
	/*设置第二场的消隐的行数*/ 
	VP_RSETH(vpDisplayHandle , VDVBIT2,VP_VDVBIT2_RMK(VD_VBIT_CLR2,  
													  VD_VBIT_SET2)); 
	/* No image offsets in this example */ 
	/* set image size for field1,每一场设置图像的大小 */ 
	VP_RSETH(vpDisplayHandle , VDIMGSZ1,VP_VDIMGSZ1_RMK(VD_IMG_VSIZE1,  
														VD_IMG_HSIZE1)); 
	/* set image size for field2，设置第二场图像的大小 */ 
	VP_RSETH(vpDisplayHandle , VDIMGSZ2,VP_VDIMGSZ1_RMK(VD_IMG_VSIZE2,  
														VD_IMG_HSIZE2)); 
	/*设置FLD信号的逻辑*/ 
	/* set field1 timing ，设置第一场的起始点*/ 
	VP_RSETH(vpDisplayHandle , VDFLDT1,VP_VDFLDT1_RMK(VD_FIELD1_YSTART, VD_FIELD1_XSTART)); 
	/* set field2 timing ，设置第二场的起始点*/ 
	VP_RSETH(vpDisplayHandle , VDFLDT2,VP_VDFLDT2_RMK(VD_FIELD2_YSTART, VD_FIELD2_XSTART)); 
	/*设置EAV与SAV中的F位的值*/ 
	/* set display field bit register(VD_FBIT) */ 
	VP_RSETH(vpDisplayHandle , VDFBIT,VP_VDFBIT_RMK(VD_FBIT_SET, VD_FBIT_CLR)); 
	 
	/* set horizontal sync control (VCTL1S) ，设置水平同步信号输出的控制*/ 
	VP_RSETH(vpDisplayHandle , VDHSYNC,VP_VDHSYNC_RMK(VD_HSYNC_STOP, VD_HSYNC_START)); 
	/*设置重直同步信号输出的控制*/ 
	/* set vertical sync start for field1 (VCTL1S) */ 
	VP_RSETH(vpDisplayHandle , VDVSYNS1,VP_VDVSYNS1_RMK(VD_VSYNC_YSTART1,VD_VSYNC_XSTART1)); 
	/* set vertical sync end for field1 (VCTL1S) */ 
	VP_RSETH(vpDisplayHandle , VDVSYNE1,VP_VDVSYNE1_RMK(VD_VSYNC_YSTOP1, VD_VSYNC_XSTOP1)); 
	/* set vertical sync start for field2 (VCTL2S) */ 
	VP_RSETH(vpDisplayHandle , VDVSYNS2,VP_VDVSYNS2_RMK(VD_VSYNC_YSTART2,VD_VSYNC_XSTART2)); 
	/* set vertical sync end for field2 (VCTL2S) */ 
	VP_RSETH(vpDisplayHandle , VDVSYNE2,VP_VDVSYNE2_RMK(VD_VSYNC_YSTOP2, VD_VSYNC_XSTOP2)); 
	/* Let clipping values to be their defaults (VD_CLIP) No need to set DEF_VAL and VD_RELOAD in this example*/ 
	/*设置中断事件*/ 
	/* set event register */ 
	VP_RSETH(vpDisplayHandle , VDDISPEVT,VP_VDDISPEVT_RMK(VD_DISPEVT2, VD_DISPEVT1)); 
	/* Vertical interrupts are not used in this example (VD_VINT) */ 
	/* set threshold value for DMA events */ 
	VP_RSETH(vpDisplayHandle, VDTHRLD,VP_VDTHRLD_RMK(VD_VDTHRLD2, 
													 VP_VDTHRLD_INCPIX_DEFAULT,  
													 VD_VDTHRLD1)); 
	/* ............................... */ 
	/* Set display control reg(VD_CTL) */ 
	/* ............................... */ 
	/* set display mode(DMODE) to 8-bit BT.656 */ 
	VP_FSETH(vpDisplayHandle , VDCTL, DMODE, VP_VDCTL_DMODE_BT656B); 
	/* set non-continuous frame display */ 
	VP_FSETH(vpDisplayHandle , VDCTL, CON, VP_VDCTL_CON_DISABLE); 
	VP_FSETH(vpDisplayHandle , VDCTL, FRAME, VP_VDCTL_FRAME_FRMDIS); 
	VP_FSETH(vpDisplayHandle , VDCTL, DF2, VP_VDCTL_DF2_NONE); 
	VP_FSETH(vpDisplayHandle , VDCTL, DF1, VP_VDCTL_DF1_NONE); 
	/* let control outputs(VCTL1S, VCTL2S, VCTL3S, HXS, VXS, FXS) */ 
	/* be their defaults i.e. VCTLxS are output control signals */ 
	/* no scaling and no resampling in this example */ 
	/* no need to bother about 10.bit unpacking mode(DPK bit) */ 
	/* in this 8.bit example */ 
	/* Set up Y, Cb and Cr EDMA channels */ 
	setupVPDispEDMA(portNumber); 
	IRQ_enable(vpDisplayHandle ->eventId); 
	/* clear VPHLT in VP_CTL to make video port function */ 
	VP_FSETH(vpDisplayHandle , VPCTL, VPHLT, VP_VPCTL_VPHLT_CLEAR); 
	 
	return vpDisplayHandle;	 
	 
} 
/*................................................................ */ 
/* Function : bt656_display_start */ 
/* Input(s) : VP_Handle*/ 
/* Description : Configures given video port for 8.bit BT.656 non. */ 
/* continuous frame display. */ 
/*................................................................ */ 
void bt656_display_start(VP_Handle vpDisplayHandle) 
{ 
	/* .............. */ 
	/* enable display */ 
	/* .............. */ 
	/* set VDEN to enable display for loop-back */ 
	VP_FSETH(vpDisplayHandle, VDCTL, VDEN, VP_VDCTL_VDEN_ENABLE); 
	/* clear BLKDIS in VD_CTL to enable display DMA events */ 
	VP_FSETH(vpDisplayHandle, VDCTL, BLKDIS, VP_VDCTL_BLKDIS_CLEAR); 
 
} 
/*................................................................ */ 
/* Function : VPDispIsr */ 
/* Description : This display ISR clears FRMD to continue display */ 
/* in this non.continuous mode and also clears other */ 
/* status bits. */ 
/*................................................................ */ 
interrupt void VPDispIsr(void) 
{ 
	Uint32 vpis = 0; 
	vpis = VP_RGETH(vpDisplayHandle , VPIS); 
	if(vpis & _VP_VPIS_DCMP_MASK) /* frame display complete */ 
	{ 
		/* Clear frame complete bit FRMD to continue display */ 
		VP_FSETH(vpDisplayHandle , VDSTAT, FRMD, 
		VP_VDSTAT_FRMD_CLEAR); 
		/* clear DCMPA to enable next frame complete interrupts */ 
		VP_FSETH(vpDisplayHandle , VPIS, DCMP, VP_VPIS_DCMP_CLEAR); 
		displayFrameCount++; /* increment displayed frame count */ 
		disNewFrame = 1; 
	} 
	if(vpis & _VP_VPIS_DUND_MASK) /* underrun error */ 
	{ 
		dispUnderrun++; 
		/* clear DUND to enable next underrun interrupts */ 
		VP_FSETH(vpDisplayHandle , VPIS, DUND, VP_VPIS_DUND_CLEAR); 
	} 
} 
/*................................................................ */ 
/* Function : setupVPDispEDMA */ 
/* Input(s) : portNumber, video port number i.e. 0,1 or 2. */ 
/* Description : Sets up DMA channels for Y, U, V events for VP */ 
/* display. */ 
/*................................................................ */ 
void setupVPDispEDMA(Int32 portNumber) 
{ 
	Int32 YEvent, UEvent, VEvent; 
	/* get Y, U, V EDMA event numbers */ 
	switch(portNumber) 
	{ 
		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 */ 
	/* Y-data buffer, dispYSpace to YDSTA (FIFO) */ 
	configVPDispEDMAChannel(&hEdmaVPDispY, YEvent, 
							&edmaDispYTccNum, 
							(Uint32)disChaAYSpace, 
							vpDisplayHandle ->ydstaAddr, 
							VD_Y_EDMA_FRMCNT, 
							VD_Y_EDMA_ELECNT); 
	/* Configure Cb EDMA channel to move data from */ 
	/* Cb-data buffer, dispCbSpace to CbDSTA (FIFO) */ 
	configVPDispEDMAChannel(&hEdmaVPDispCb, UEvent, 
							&edmaDispCbTccNum, 
							(Uint32)disChaACbSpace, 
							vpDisplayHandle ->cbdstAddr, 
							VD_Y_EDMA_FRMCNT, 
							VD_Y_EDMA_ELECNT/2); /* (1/2) of Y */ 
	/* Configure Cr EDMA channel to move data from */ 
	/* Cr-data buffer, dispCrSpace to CrDSTA (FIFO) */ 
	configVPDispEDMAChannel(&hEdmaVPDispCr, VEvent, 
							&edmaDispCrTccNum, 
							(Uint32)disChaACrSpace, 
							vpDisplayHandle ->crdstAddr, 
							VD_Y_EDMA_FRMCNT, 
							VD_Y_EDMA_ELECNT/2); 
	/* enable three EDMA channels */ 
	EDMA_enableChannel(hEdmaVPDispY); 
	EDMA_enableChannel(hEdmaVPDispCb); 
	EDMA_enableChannel(hEdmaVPDispCr); 
} 
/*................................................................ */ 
/* Function : configVPDispEDMAChannel */ 
/* */ 
/* 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 display EDMA channel. */ 
/* The destination address update is fixed because */ 
/* the displayed data is write to the FIFO. */ 
/* In this example, the source address mode is */ 
/* auto.increment. But, in real.time applications */ 
/* there is lot of flexibility in the way display */ 
/* buffers can be managed like ping.pong and round */ 
/* robin,…etc. */ 
/*................................................................ */ 
void configVPDispEDMAChannel( EDMA_Handle *edmaHandle, 
							  Int32 eventId,  
							  Int32 *tccNum, 
							  Uint32 srcAddr,  
							  Uint32 dstAddr, 
							  Uint32 frameCount,  
							  Uint32 elementCount) 
{ 
	Int32 tcc = 0; 
	EDMA_Handle hEdmaTable; 
	/* Open Y event 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(;;){} 
	} 
	/*打开一个新的EDMA链接*/ 
	hEdmaTable = EDMA_allocTable(-1); 
	/* Configure EDMA parameters */ 
	EDMA_configArgs( 
		*edmaHandle, 
		EDMA_OPT_RMK( 
			EDMA_OPT_PRI_MEDIUM, /* medium priority */ 
			EDMA_OPT_ESIZE_32BIT, /* Element size 32 bits */ 
			EDMA_OPT_2DS_YES, /* 2-dimensional source */ 
			EDMA_OPT_SUM_INC, /* source address auto increment */ 
			EDMA_OPT_2DD_NO, /* 1-dimensional destination(FIFO) */ 
			EDMA_OPT_DUM_NONE, /* fixed dest address mode(FIFO) */ 
			EDMA_OPT_TCINT_YES, /* Enable transfer complete indication*/ 
			EDMA_OPT_TCC_OF(tcc & 0xF), 
			EDMA_OPT_TCCM_OF(((tcc & 0x30) >> 4)), 
			EDMA_OPT_ATCINT_NO, /* Disable Alternate Transfer Complete Interrupt */ 
			EDMA_OPT_ATCC_OF(0), 
			EDMA_OPT_PDTS_DISABLE, /* disable PDT(peripheral device  transfer) mode for source*/ 
			EDMA_OPT_PDTD_DISABLE, /* disable PDT mode for dest */ 
			EDMA_OPT_LINK_YES, /* Disable linking */ 
			EDMA_OPT_FS_NO /* Array synchronization */ 
		), 
		EDMA_SRC_RMK(srcAddr), 
		EDMA_CNT_RMK(EDMA_CNT_FRMCNT_OF((frameCount-1)), 
					 EDMA_CNT_ELECNT_OF(elementCount)), 
		EDMA_DST_RMK(dstAddr), 
		EDMA_IDX_RMK(EDMA_IDX_FRMIDX_OF((elementCount * 4)), 
		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)) 
		); 
	EDMA_configArgs( 
		hEdmaTable,/*配置表的句柄*/ 
		EDMA_OPT_RMK( 
			EDMA_OPT_PRI_MEDIUM, /* medium priority */ 
			EDMA_OPT_ESIZE_32BIT, /* Element size 32 bits */ 
			EDMA_OPT_2DS_YES, /* 2-dimensional source */ 
			EDMA_OPT_SUM_INC, /* source address auto increment */ 
			EDMA_OPT_2DD_NO, /* 1-dimensional destination(FIFO) */ 
			EDMA_OPT_DUM_NONE, /* fixed dest address mode(FIFO) */ 
			EDMA_OPT_TCINT_YES, /* Enable transfer complete indication*/ 
			EDMA_OPT_TCC_OF(tcc & 0xF), 
			EDMA_OPT_TCCM_OF(((tcc & 0x30) >> 4)), 
			EDMA_OPT_ATCINT_NO, /* Disable Alternate Transfer Complete Interrupt*/ 
			EDMA_OPT_ATCC_OF(0), 
			EDMA_OPT_PDTS_DISABLE, /* disable PDT(peripheral devicetransfer) mode for source */ 
			EDMA_OPT_PDTD_DISABLE, /* disable PDT mode for dest */ 
			EDMA_OPT_LINK_YES, /* Enable linking */ 
			EDMA_OPT_FS_NO /* Array synchronization */ 
		), 
		EDMA_SRC_RMK(srcAddr), 
		EDMA_CNT_RMK(EDMA_CNT_FRMCNT_OF((frameCount-1)), 
					 EDMA_CNT_ELECNT_OF(elementCount)), 
		EDMA_DST_RMK(dstAddr), 
		EDMA_IDX_RMK(EDMA_IDX_FRMIDX_OF((elementCount * 4)), 
										 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)) 
	); 
	/*连接两个DMA*/ 
	EDMA_link(*edmaHandle,hEdmaTable); 
	/*使EDMA循环起来*/ 
	EDMA_link(hEdmaTable,hEdmaTable); 
	*tccNum = tcc; 
}