Texas Instruments TMS320C64x DSP manual VDIMGHSIZE1 * VDIMGVSIZE1

Example 2: Noncontinuous Frame Display for 525/60 Format

/* –––––––––––––––––––––––––––––––––––––––––– */
/* Define vertical synchronization for field2 */
/* –––––––––––––––––––––––––––––––––––––––––– */
#define VD_VSYNC_XSTART2	360
#define VD_VSYNC_YSTART2	266
#define VD_VSYNC_XSTOP2	360
#define VD_VSYNC_YSTOP2	269

/* –––––––––––––––––––––––––––––––––––––––– */
/* 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	244 /* field1 vertical image size		*/
#define VD_IMG_HSIZE2	720 /* field2 horizontal image size		*/
#define VD_IMG_VSIZE2	243 /* 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	5 /* in this example	*/
/* –––––––––––––––––––––––––––––––––––––––––––– */
/* EDMA parameters for display Y event that are */
/* specific to this example.	*/

/* –––––––––––––––––––––––––––––––––––––––––––– */

#define VD_Y_EDMA_ELECNT	(VD_VDTHRLD1 * 2) /* VD_VDTHRLDn is in double–words
	and 32–bit element size */
#define VD_Y_EDMA_FRMCNT	((VD_DISPEVT1 + VD_DISPEVT2) *
	DISPLAY_FRAME_COUNT)

A-12 Video Port Configuration Examples SPRU629