CToolslib EDMA doesn`t work.

I`m using TCI6638, CCS v5.5, mcsdk 3.1.1.4.

There is a example, and it works. (path : C:\ti\mcsdk_bios_3_01_01_04\examples\ctools\evmk2h\mc_pc_trace_edma_drn)

But, when I apply to my project, It doesn`t work.

My project is using UART, IPC, and No EDMA.

I added codes below this.

in cfg file.

/* Load the Trace Debug Package */
xdc.loadPackage('ti.sdo.edma3.drv');
var ctools = xdc.loadPackage('ctoolslib_sdk.evmk2h');

and cpp file

int DspShellReadMem(const char * * params, int param_cnt)
{
	uint32_t*   pBuffer = 0;
	int32_t     coreId, i;
	ctools_Result ctools_ret = {0};
	ctools_edma_result_t pct_edma_res;
	EDMA3_RM_Handle  edma3_handle;
	ctools_etb_config_t config = {0};
	/* channel arrary */
	uint32_t  edma3_channels[10] = {0};
	/* param array */
	uint32_t  edma3_params[10] = {0};

	coreId = DNUM;

	/* 1. Initialize the ETB */
	/* 1a. Get the EDMA requirements/pre-setups for the ctools use case library */
	edma3_handle = app_edma_pre_setup(&edma3_channels[0], &edma3_params[0]);
	if (NULL == edma3_handle)
		return -2;
	config.edmaConfig.param_ptr    = &edma3_params[0];
	config.edmaConfig.dbufAddress  = (uint32_t)&trace_data;
	config.edmaConfig.dbufBytes    = 0x2000;
	config.edmaConfig.mode         = CTOOLS_USECASE_EDMA_STOP_BUF_MODE;
	config.etb_mode                = eETB_TI_Mode;
	if (CTOOLS_SOK != ctools_etb_init(CTOOLS_DRAIN_ETB_EDMA, &config, CTOOLS_DSP_ETB))
		return -1;

	/* 3. Initialize the DSP trace
	     * Please refer to the ctools use case library Doxygen API reference
	     * Guide for the API usage */
	ctools_ret = ctools_dsptrace_init();
	if (ctools_ret != CTOOLS_SOK)
	{
	    System_printf (" ctools_dsptrace_init failed\n");
		exit (1);
	}

	ctools_ret = ctools_pct_setup(&example_start_symb, &example_stop_symb);
	//ctools_ret = ctools_pct_start_now();
	if (ctools_ret != CTOOLS_SOK)
	{
		System_printf (" ctools_pct_start_exc failed\n");
		return -1;
	}

	/* trigger the PC trace start in ETB when PC hits this function */
	example_start_symb();

	if (param_cnt != 3)
	{
		MAKE_DATA("[usage] : read_mem [start address(hex value)] [size(words)]\r\n");
		MAKE_DATA("example : read_mem 80000000 16\r\n");
		return 1;
	}

	unsigned long addr = strtoul(params[1], NULL, 16);
	int size = atoi(params[2]);
	unsigned long * ptr = (unsigned long *)addr;
	Cache_wbInvAll();

	for (int i=0; i<size; ++i)
	{
		MAKE_DATA("[%d] => 0x%08X\r\n", i, ptr[i]);
	}

	/* Trigger the PC trace stop when PC hits this function*/
	example_stop_symb();
	//if (CTOOLS_SOK != ctools_pct_stop_now()) return -2;

	/* 5. Call PC trace job close, to drain the collected trace
	 * This would copy ETB hardware buffer as a linear buffer
	 * containing PC and timing traces to the memory provided here
	 */
	ctools_ret = ctools_etb_edma_drain(&pct_edma_res, CTOOLS_DSP_ETB);

	if(ctools_ret == CTOOLS_SOK)
	{
		System_printf("ctools_etb_edma_drain successful, %d bytes would be available in the &etb_drain_mem[%d] memory\n", pct_edma_res.availableWords, DNUM);
	}
	else
	{
		System_printf("ctools_pct_stop_cpu_drn failed [%d]\n", ctools_ret);
	}

	/* 6. close the PCT */
	ctools_pct_close();

	/* 7. Shutdown the dsp trace */
	ctools_ret = ctools_dsptrace_shutdown();
	if(ctools_ret == CTOOLS_SOK)
	{
		System_printf("ctools_dsptrace_shutdown successful\n");
	}
	else
	{
		System_printf("ctools_dsptrace_shutdown failed\n");
	}

	System_flush();

	return 1;
}

when I execute this code, There is No Error. 

In console window message, 

edma3init() Passed
ctools_etb_edma_drain successful, 2048 bytes would be available in the &etb_drain_mem[0] memory
ctools_dsptrace_shutdown successful

But, in trace_data buffer memory, there is no data. 

What is problem? please help me. I have no idea.