I am using the SPI_Test project which you attached here. I changed the project to make it work on 21469 Evaluation board(ADSP-21469_EZ-Board).
What I observed is that I am getting the SPI interrupts continuously. Eventhough I am not loading any data into the TXSPI registed in the ISR(which I commented), still interrupt is coming. Please let me know if I missing something here. I had attached my code here.