struck in wait_for_transfer_completion() when I enable freeRTOS. for AEK_AUD_C1D9031.

I debug up to hear and the flow of the code is blocked in this function,(after adding freeRTOS) in the project. i don't know what is the error. i had used the low level API which is avaliable in the document.

the flow is like this in the main function. at AEK_903D_Init(). it is blocked. and not coming out of that API. please help me out.
