Texas Instruments TMS320C64x DSP manual Example 2 Noncontinuous Frame Display for 525/60 Format

Example 2: Noncontinuous Frame Display for 525/60 Format

A.2 Example 2: Noncontinuous Frame Display for 525/60 Format

This is an example that explains how to configure the video port for 8-bit BT.656 noncontinuous frame display for 525/60 format. See ITU–R BT.656–4 and video port specification (Figures 4–11, 4–33, 4–34, and Table 4–37) for more details on 525/60 format. For simplicity, this example does not contain any margins; that is, both vertical and horizontal offsets are zero. In other words, both active area and image area are the same.

/**********************************************************/ /* Display parameter definitions based on 525/60 format */ /**********************************************************/

/* ––––––––––––––––– */ /* Define frame size */ /* ––––––––––––––––– */ #define VD_FRM_WIDTH

#define VD_FRM_HEIGHT #define VD_FRM_SIZE

/* ––––––––––––––––––– */ /* Horizontal blanking */ /* ––––––––––––––––––– */ #define VD_HBLNK_START #define VD_HBLNK_STOP #define VD_HBLNK_SIZE

858	/* no of pixels per frame line	*/
	/* including horizontal blanking	*/
525	/* total noof lines per frame	*/

(VD_FRM_WIDTH * VD_FRM_HEIGHT)

720	/* starting location of EAV	*/
856	/* starting location of SAV	*/
(VD_HBLNK_STOP – VD_HBLNK_START +

2/*EAV*/) /* (138) EAV, SAV inclusive */

/* –––––––––––––––––––––––––––– */
/* Vertical blanking for field1 */
/* –––––––––––––––––––––––––––– */
#define VD_VBLNK_XSTART1	720	/* pixel on which VBLNK active	*/
		/* edge occurs for field1	*/
#define VD_VBLNK_YSTART1	1 /* line on which VBLNK active		*/
		/* edge occurs for field1	*/
#define VD_VBLNK_XSTOP1	720	/* pixel on which VBLNK inactive	*/
		/* edge occurs for field1	*/
#define VD_VBLNK_YSTOP1	20	/* line on which VBLNK inactive	*/
		/* edge occurs for field1	*/
/* –––––––––––––––––––––––––––– */
/* Vertical blanking for field2 */
/* –––––––––––––––––––––––––––– */
#define VD_VBLNK_XSTART1	360	/* pixel on which VBLNK active	*/
		/* edge occurs for field2	*/
#define VD_VBLNK_YSTART1	263	/* line on which VBLNK active	*/
		/* edge occurs for field2	*/
#define VD_VBLNK_XSTOP1	360	/* pixel on which VBLNK inactive	*/
		/* edge occurs for field2	*/
#define VD_VBLNK_YSTOP1	283	/* line on which VBLNK inactive	*/
		/* edge occurs for field2	*/

A-10 Video Port Configuration Examples SPRU629