Texas Instruments TMS320C64x DSP - Manual (Page 279)

Example 1: Noncontinuous Frame Capture for 525/60 Format
A-3 Video Port Configuration Examples SPRU629
/* –––––––––––––––––––––––––––––––––––––––––––– */
/* EDMA parameters for capture Y event that are */
/* specific to this example. */
/* –––––––––––––––––––––––––––––––––––––––––––– */
#define VCA_Y_EDMA_ELECNT (VCA_THRLD_FIELD1 * 2) /* because VCA_THRLD_FIELDn is
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[]; /* buffer to store captured Y–data */
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; /* EDMA tcc for Y channel */
Int32 edmaCapChaACbTccNum = 0; /* EDMA tcc for Cb channel */
Int32 edmaCapChaACrTccNum = 0; /* EDMA tcc for Cb channel */
volatile Uint32 capChaAFrameCount = 0; /* no of frames captured */