How to transmit custom data with the AD-FMCOMMS2-EBZ

Hi everyone,

   Now I download the hdl-hdl_2015_r1 and no-OS-2015_R1, I succeed in watching the sine waveform. But now I want to transmit the custom data, for example, Chirps, what should I do? And if I want to know the process of transmit, Could you give me some help?