Texas Instruments TMS320C64x DSP - Manual (Page 285)

Example 1: Noncontinuous Frame Capture for 525/60 Format
A-9 Video Port Configuration Examples SPRU629
void configVPCapEDMAChannel(EDMA_Handle *edmaHandle, Int32 eventId,
Int32 *tccNum, Uint32 srcAddr,
Uint32 dstAddr, Uint32 frameCount,
Uint32 elementCount)
{
Int32 tcc = 0;
/* Open Y EVT EDMA channel */
*edmaHandle = EDMA_open(eventId, EDMA_OPEN_RESET);
if(*edmaHandle == EDMA_HINV)
test_exit(FAIL);
/* allocate TCC for Y event */
if((tcc = EDMA_intAlloc(–1)) == –1)
test_exit(FAIL);
/* Configure EDMA parameters */
EDMA_configArgs(
*edmaHandle,
EDMA_OPT_RMK(
EDMA_OPT_PRI_MEDIUM, /* medium priority */
EDMA_OPT_ESIZE_32BIT, /* Element size 32 bits */
EDMA_OPT_2DS_NO, /* 1–dimensional source(FIFO) */
EDMA_OPT_SUM_NONE, /* fixed src address mode(FIFO) */
EDMA_OPT_2DD_YES, /* 2–dimensional destination */
EDMA_OPT_DUM_INC, /* destination increment */
EDMA_OPT_TCINT_YES, /* Enable transfer complete */
/* indication */
EDMA_OPT_TCC_OF(tcc & 0xF),
EDMA_OPT_TCCM_OF(((tcc & 0x30) >> 4)),
EDMA_OPT_ATCINT_NO, /* Disable Alternate Transfer */
/* Complete Interrupt */
EDMA_OPT_ATCC_OF(0),
EDMA_OPT_PDTS_DISABLE, /* disable PDT(peripheral device */
/* transfer) mode for source */
EDMA_OPT_PDTD_DISABLE, /* disable PDT mode for dest */
EDMA_OPT_LINK_NO, /* Disable linking */
EDMA_OPT_FS_NO /* Array synchronization */
),
EDMA_SRC_RMK(srcAddr),
EDMA_CNT_RMK(EDMA_CNT_FRMCNT_OF((frameCount – 1)),
EDMA_CNT_ELECNT_OF(elementCount)),
EDMA_DST_RMK(dstAddr),
EDMA_IDX_RMK(EDMA_IDX_FRMIDX_OF((elementCount * 4)),
EDMA_IDX_ELEIDX_OF(0)), /* note: 32–bit element size */
/* no RLD in 2D and no linking */
EDMA_RLD_RMK(EDMA_RLD_ELERLD_OF(0), EDMA_RLD_LINK_OF(0))
);
*tccNum = tcc;
}