Amruta,
I have modified the dac_dma_setup() function so the transmitted data on each channel is independent (fmcomms1/Common/test.c: dac_dma_setup() uses independent data on each ch... · 5f9db33 · analogdevicesinc/no-OS · GitHub). I have tested the change and the sine wave is transmitted correct.
Please start from our example, make sure that you get the same results as us and just after that add your custom data.
Regards,
Dragos