C6727 PING-PANG CAN'T WORK

I wanted to combine the example of ad/da programe with dmax program making a pingpang structure ,but it didn't work afer my two weeks' emmulation.Dmaxinit codes as follows,can you tell me where is wrong?Thank you.

CSL_Status dmax_init(     void ) {    

Uint32      i = 0;   

CSL_Status  status2;  

  Uint32      response;

    response = fillMem ((Uint32) srcData,         DMAX_DATA_TRANSFER_COUNT, SRC_DATA_DEFAULT, FILL_INC);     if (response == ERROR_FILL) {         status2 = ERROR_FILL;         return status2;     }

    response = fillMem ((Uint32) dstData,         DMAX_DATA_TRANSFER_COUNT, DST_DATA_DEFAULT, FILL_CONST);     if (response == ERROR_FILL) {         status2 = ERROR_FILL;         return status2;     }

    CSL_sysInit();

  status2 = CSL_dmaxInit (NULL);

    if (status2 != CSL_SOK) {         return status2;     }

  CSL_intcSetVectorPtr (ISTP_VECTOR_VALUE);

dmaxEvent.eventUid = CSL_DMAX_LOPRIORITY_MCASP0RX_UID

dmaxEvent.paramUid = CSL_DMAX_LOPRIORITY_PARAMETERENTRY0_UID;

hDmax = CSL_dmaxOpen (&dmaxEvent, CSL_DMAX, NULL, &status2);

    if (status2 != CSL_SOK || (hDmax == (CSL_DmaxHandle) CSL_DMAX_BADHANDLE)) {         status2 = CSL_ESYS_BADHANDLE;         return status2;     }

  gpxfrEventSetup.qtsl    = CSL_DMAX_EVENT2_QTSL_MOVE4_ELE;  

  gpxfrEventSetup.tcc     = CSL_DMAX_EVENT2_TCC_RESETVAL;    

  gpxfrEventSetup.atcint  = CSL_DMAX_EVENT2_ATCINT_DISABLE;  

gpxfrEventSetup.tcint   = CSL_DMAX_EVENT2_TCINT_ENABLE;   

  gpxfrEventSetup.rload   = CSL_DMAX_EVENT2_RLOAD_ENABLE;  

gpxfrEventSetup.cc      = CSL_DMAX_EVENT2_CC_COUNT2_15_COUNT1_8_COUNT0_8; 

gpxfrEventSetup.esize   = CSL_DMAX_EVENT2_ESIZE_32BIT;   

gpxfrEventSetup.pte     = hDmax->paramPtr;  

  gpxfrEventSetup.etype   = CSL_DMAX_EVENT2_ETYPE_GENERALXFR;

    gpxfrEventSetup.paramSetup = &gpxfrParameterSetup;

gpxfrParameterSetup.count0  = DMAX_DATA_TRANSFER_COUNT; 

  gpxfrParameterSetup.count1  = 0;

gpxfrParameterSetup.count2  = 0;   

gpxfrParameterSetup.srcIndex0   = 0x0; 

gpxfrParameterSetup.dstIndex0   = 1;   

  gpxfrParameterSetup.srcIndex1   = 0;   

   gpxfrParameterSetup.dstIndex1   = 0;   

  gpxfrParameterSetup.dstIndex2   = 0;

  gpxfrParameterSetup.srcReloadAddr0 = (Uint32)0x54000000;  

   gpxfrParameterSetup.dstReloadAddr0 = (Uint32) dstData;

   gpxfrParameterSetup.srcReloadAddr1 = SRC_ADDR1;  

  gpxfrParameterSetup.dstReloadAddr1 = DST_ADDR1;

   dmaxhwSetup.polarity = CSL_DMAX_POLARITY_RISING_EDGE;

dmaxhwSetup.priority    = CSL_DMAX_EVENT_LO_PRIORITY; 

   dmaxhwSetup.eventSetup  = (CSL_DmaxEventSetup *) & gpxfrEventSetup;

status2 = CSL_dmaxHwSetup (hDmax, &dmaxhwSetup);    

if (status2 != CSL_SOK) {         dmax_error_exit ();         return status2;     }

  status2 = setup_interrupts ();   

if (status2 != CSL_SOK) {         dmax_error_exit ();         return status2;     }

status2 = CSL_dmaxHwControl (hDmax, CSL_DMAX_CMD_EVENTENABLE, NULL); 

   if (status2 != CSL_SOK) {         dmax_error_exit ();         return status2;     }

status2 = CSL_dmaxHwControl (hDmax, CSL_DMAX_CMD_STARTASYNCTRANSFER, NULL); 

   if (status2 != CSL_SOK) {         dmax_error_exit ();         return status2;     }

status2 =         CSL_dmaxGetHwStatus (hDmax, CSL_DMAX_QUERY_GET_TCC, (void *) &response);   

if (status2 != CSL_SOK) {         dmax_error_exit ();         return status2;     }

    while (!response) {         status2 =             CSL_dmaxGetHwStatus (hDmax, CSL_DMAX_QUERY_GET_TCC,             (void *) &response);    

    if (status2 != CSL_SOK) {             dmax_error_exit ();             return status2;         }     }

if (response != 1) {         printf ("Error - CPPUINT 8 Set, But TCC not set!\n");     }  

  else {         for (i = 0; i < DMAX_DATA_TRANSFER_COUNT; i++) {             if (srcData[i] != dstData[i]) {                 dmax_error_exit ();              

  status2 = CSL_ESYS_FAIL;                 return status2;             }         }     }

status2 = CSL_dmaxHwControl (hDmax, CSL_DMAX_CMD_CLEARTCC, NULL);   

if (status2 != CSL_SOK) {         dmax_error_exit ();         return status2;     }

  status2 =         CSL_dmaxGetHwStatus (hDmax, CSL_DMAX_QUERY_GET_TCC, (void *) &response);   

if (status2 != CSL_SOK) {         dmax_error_exit ();         return status2;     }

if (response != 0) {         printf ("Clear TCC Bit failed!\n");     }  

  else {         printf ("Clear TCC bit Passed!\n");     }

   status2 = CSL_dmaxClose (hDmax);   

if (status2 != CSL_SOK) {         return status2;     }     return status2; }