vportdis.c

基于ti公司的DM642的图像预处理的关键程序

	/*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;
}