Texas Instruments TMS320C64x DSP manual Vcayedmafrmcnt

Example 1: Noncontinuous Frame Capture for 525/60 Format

/* 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.		*/
/*––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––			*/

A-8 Video Port Configuration Examples SPRU629