how to DR_DATA from register

I move the code to SlFifoAppThread_Entry() 

my GPIF project follows

void
SlFifoAppThread_Entry (
        uint32_t input)
{
 CyU3PReturnStatus_t apiRetStatus = CY_U3P_SUCCESS;
 uint32_t *buffer1=0;
 *buffer1=0x0000FF00;
    /* Initialize the debug module */
    CyFxUhpiDebugInit();
    //CyU3PDebugPrint (4, "CyFxUhpiDebugInit success,code = %d\n",1 );
    /* Initialize the GPIF */
    CyFxGpioInit();
    //CyU3PDebugPrint (4, "CyFxGpioInit success,code = %d\n",2 );
    //uint16_t ENdian;
    //CY_U3P_GPIF_BYTE_ENDIAN=0x0001;

    /* Initialize the GPIF */
    CyFxUhpiGpifInit();

    /* Initialize the slave FIFO application */
    CyFxSlUhpiApplnInit();

    //CyU3PDebugPrint (4, "CyFxSlUhpiApplnInit success,code = %d\n",3 );

   apiRetStatus=CyU3PGpifWriteDataWords (0,0,1,buffer1,10);
    CyU3PDebugPrint (4, " CyU3PGpifWriteDataWords, Error code = %d\n", apiRetStatus);
    CyU3PGpifControlSWInput(CyTrue);
    CyU3PThreadSleep (100);

in this way ,my Oscilloscope read the data bus nothing ,the date  writes successfully ,so i want to know if  the configure of theCyU3PGpifWriteDataWords is right ,  I have test the bits get for one time,16bits one time ,so if you have a example that can do success ?

I'm sorry . there is data in data bus when move the code to SlFifoAppThread_Entry(). today I use 32bit data bus it put out right , but when i sent two 32bit data ,but it can not refresh the data 

 uint32_t *buffer1=0;
 uint32_t *buffer2=0;
 *buffer1=0x00FFFF00;
 *buffer2=0xFF0000FF;

   apiRetStatus=CyU3PGpifWriteDataWords (0,0,1,buffer1,10);
    CyU3PDebugPrint (4, " CyU3PGpifWriteDataWords, Error code = %d\n", apiRetStatus);
    CyU3PGpifControlSWInput(CyTrue);

   apiRetStatus=CyU3PGpifWriteDataWords (0,0,1,buffer2,10);
    CyU3PDebugPrint (4, " CyU3PGpifWriteDataWords, Error code = %d\n", apiRetStatus);
    CyU3PGpifControlSWInput(CyTrue); 

I can get the first data ,but the second data lost. so can I Initialize the register?

 uint32_t  tmp_data[4] ={0x55, 0x22, 0x11, 0x44};I'm not very clear about this, the data type is not  the same to  the data, it whether indicate that the register can transfer 16 bits for one time ?