Texas Instruments TMS320C64x DSP User Manual
Page 288
Example 2: Noncontinuous Frame Display for 525/60 Format
Video Port Configuration Examples
A-12
SPRU629
/* –––––––––––––––––––––––––––––––––––––––––– */
/* 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)