SPORT core transfer tx problem

Hello,

is there any code to demonstrate how to properly use SPORT in core transfer mode?

I try to send several bytes over SPORT (tx) and I didn't get any succes.

I made a few tries. Below I am attaching my code.
It is about sending 0xaaaa value continuously for testing purposes.
The CLK and FS lines work for me.
Unfortunately, on D0 (line DAI0_PB_05) I still have high impedance.
What could be the reason why the data is not pushed to SPORT1_AD0 line at all?
When I debug I see only first call of adi_sport_CoreTransfer() function return 0 (success) and the next resturn 4 (ADI_SPORT_TRANSFER_IN_PROGRESS), but there is nothing on D0 line.

Can anyone help me with this issue? Maybe some example of SPORT TX core transfer will be enough.

#define SPORT_DEVICE_1A				1u
/* SPORT Handle */
ADI_SPORT_HANDLE hSPORTDev1ATx;//TX


void SPORT_Test_CoreTransfer(void)
{


	*pREG_PADS0_DAI0_IE = BITM_PADS_DAI0_IE_VALUE;
	*pREG_PADS0_DAI1_IE = BITM_PADS_DAI1_IE_VALUE;

	SRU(SPT1_ACLK_PBEN_O, DAI0_PBEN04_I);
	SRU(SPT1_ACLK_O, DAI0_PB04_I);
	//
	SRU(SPT1_AD0_PBEN_O, DAI0_PBEN05_I);
	SRU(SPT1_AD0_O, DAI0_PB05_I);

	SRU(SPT1_AFS_PBEN_O, DAI0_PBEN01_I);
	SRU(SPT1_AFS_O, DAI0_PB01_I);


	adi_sport_Open(SPORT_DEVICE_1A,ADI_HALF_SPORT_A,ADI_SPORT_DIR_TX, ADI_SPORT_SERIAL_MODE, SPORTMemory1A,ADI_SPORT_MEMORY_SIZE,&hSPORTDev1ATx);
	adi_sport_ConfigData(hSPORTDev1ATx,ADI_SPORT_DTYPE_ZERO_FILL,31,false,false,false);
	adi_sport_ConfigClock(hSPORTDev1ATx,64,true,false,true);
	adi_sport_ConfigFrameSync(hSPORTDev1ATx,33,true,true,false,true,true,false);

	adi_sport_RegisterCallback(hSPORTDev1ATx,SPORTFramCallbackTx, NULL);



	while(1)
	{
		uint32_t opcode1 = 0xaaaa;
		adi_sport_CoreTransfer(hSPORTDev1ATx, &opcode1, 4, ADI_SPORT_CHANNEL_PRIM);
		for(int i = 0; i < 100000; i++)
		{
		}
		tfp_printf("Test_SPORT_CoreTransfer\r\n");
	}
}