edma3 interrupt just occur one time

I use edma3_lld_02_11_09_08 to develop my edma3 driver,but the ISR function just enter one time,my configure are as follows:

#define  PING_PONG_ACNT          1
#define  PING_PONG_BCNT          8*32*40   //应该小于65535
#define  PING_PONG_CCNT          1
#define  MCASP_BASEADDR          0x01D00000
#define  Mcasp_RXEVENTQUE        (0u)

/* OPT Field specific defines */
#define OPT_SYNCDIM_SHIFT                   (0x00000002u)
#define OPT_TCC_MASK                        (0x0003F000u)
#define OPT_TCC_SHIFT                       (0x0000000Cu)
#define OPT_ITCINTEN_SHIFT                  (0x00000015u)
#define OPT_TCINTEN_SHIFT                   (0x00000014u)

static void my_edma3_init()
{
    EDMA3_DRV_PaRAMRegs paramSet = {0,0,0,0,0,0,0,0,0,0,0,0};
    EDMA3_DRV_Result result = EDMA3_DRV_SOK;
    EDMA3_DRV_Handle hEdma;
    uint32_t chId   = 0;
    uint32_t tcc    = 0;
    
    print2arm("edma3 driver init...",0);

    hEdma = edma3init(0,&result);
    if(hEdma)
    {
        print2arm("edma3init() Passed.",0);
    }
    else
    {
        print2arm("edma3init() Failed.",0);
    }
    
    if (result == EDMA3_DRV_SOK)
    {
        result = EDMA3_DRV_requestChannel (hEdma, &chId, &tcc,
                                       (EDMA3_RM_EventQueue)0,
                                            &edma3_isr, NULL);
    }
    
    if(result == EDMA3_DRV_SOK)
    {
        paramSet.srcBIdx    = 0;
        paramSet.destBIdx   = 1;
        paramSet.srcCIdx    = 0;
        paramSet.destCIdx   = 0;
        paramSet.aCnt       = PING_PONG_ACNT;
        paramSet.bCnt       = PING_PONG_BCNT;
        paramSet.cCnt       = PING_PONG_CCNT;
        
        /* For AB-synchronized transfers, BCNTRLD is not used. */
        paramSet.bCntReload = PING_PONG_BCNT;

        /* Src in constant mode Dest in INCR modes */
        paramSet.opt &= 0xFFFFFFFDu;
        //paramSet.opt &= 0xFFFFFFFCu;
        
        /* Program the TCC */
        paramSet.opt |= ((tcc << OPT_TCC_SHIFT) & OPT_TCC_MASK);

        /* Enable Intermediate & Final transfer completion interrupt */
        paramSet.opt |= (1 << OPT_ITCINTEN_SHIFT);
        paramSet.opt |= (1 << OPT_TCINTEN_SHIFT);

        /* AB Sync Transfer Mode */
        paramSet.opt |= (1 << OPT_SYNCDIM_SHIFT);
        
        /* Program the source and dest addresses for master DMA channel */
        paramSet.srcAddr    = (uint32_t)(MCASP_BASEADDR+0X029C);
        paramSet.destAddr   = (uint32_t)(ping_buffer);

        /* Write to the master DMA channel first. */
        result = EDMA3_DRV_setPaRAM(hEdma, chId, &paramSet);
    }       

    result = EDMA3_DRV_enableTransfer(hEdma,chId,EDMA3_DRV_TRIG_MODE_EVENT);
    
    if(result == EDMA3_DRV_SOK)
    {
        print2arm("edma3 driver init success.",0);
    }
}

The edma3_isr function is called just one time!!!!!    WHY??????

I use mcasp AREVT event to trigger edma3 transfer.