TMS320F280049C: FSI test issue

Hi expert:

My customer wants to use FSI to communicate between two C2000 Board. I suggest them begin with: http://www.ti.com/lit/an/spracm3/spracm3.pdf

Firstly, they use two launchpads, download the code into Flash, but nothing happened, both GPIO16 are low. And there is no signal in CLK and data0.

Then, they try 1 control card and 1 Launchpad. I add _LAUNCHXL_F280049C to pre-define symbol to change the GPIO. Connect both boards with CCS, emulation mode. RAM code. This time, both GPIO16 are high. However, The lead code is stuck at ESTOP0(fsi_ex16_daisy_handshake_lead.c); since this is Error.

while(1)  {

    #if FSI_DMA_ENABLE==0

        // Now, start transmitting data frames
		
		// Fill TX array with new data
        prepareTxBufData();

        // Write data into Tx buffer
        // Start the first transfer
        FSI_writeTxBuffer(FSITXA_BASE, txBufData, nWords, 0U);
        FSI_startTxTransmit(FSITXA_BASE);

        //
        // Wait for TX frame done event
        //
        while(fsiTxInt1Received != 1U);

		// Set FSI TX circular buffer pointer back to beginning
        FSI_setTxBufferPtr(FSITXA_BASE, 0U);

        //
        // Wait for RX data frame received event
        //
        while(fsiRxInt1Received != 1U);

		// Set FSI RX circular buffer pointer back to beginning
        FSI_setRxBufferPtr(FSIRXA_BASE, 0U);

        if(error == 0)
        {
            fsiTxInt1Received = 0U;
            fsiRxInt1Received = 0U;
        }

        else
        {
            // Error occurred during communications
            ESTOP0;
        }

I also change lower CLK, but nothing changed.

#define PRESCALER_VAL   FSI_PRESCALE_10MHZ

#define PRESCALER_VAL   FSI_PRESCALE_5MHZ

Except that, I did not change the code. 

Could you kindly tell me where I did wrong?

BR 

Emma