Texas Instruments TMS320C64x DSP Reference Manual page 279

/* –––––––––––––––––––––––––––––––––––––––––––– */
/* EDMA parameters for capture Y event that are */
/* specific to this example.
/* –––––––––––––––––––––––––––––––––––––––––––– */
#define VCA_Y_EDMA_ELECNT (VCA_THRLD_FIELD1 * 2)
in double–words and element size is 32–bit */
#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 <csl_vp.h>
#include <csl_edma.h>
#include <csl_irq.h>
/*–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
/* global variable declarations
/* ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– */
VP_Handle vpCaptureHandle; /* handle of vp that to be configured
Uint8 capChaAYSpace[];
Uint8 capChaACbSpace[]; /* buffer to store captured Cb–data
Uint8 capChaACrSpace[]; /* buffer to store captured Cb–data
EDMA_Handle hEdmaVPCapChaAY;
EDMA_Handle hEdmaVPCapChaACb;
EDMA_Handle hEdmaVPCapChaACr;
Int32 edmaCapChaAYTccNum = 0;
Int32 edmaCapChaACbTccNum = 0; /* EDMA tcc for Cb channel
Int32 edmaCapChaACrTccNum = 0; /* EDMA tcc for Cb channel
volatile Uint32 capChaAFrameCount = 0; /* no of frames captured
SPRU629
Example 1: Noncontinuous Frame Capture for 525/60 Format
/* buffer to store captured Y–data
/* EDMA tcc for Y channel
*/
/* because VCA_THRLD_FIELDn is
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Video Port Configuration Examples A-3