If you are trying to generate sine waveform using PSoC 6, using Continuous time DAC is the best option for you.
Continuous time DAC (CTDAC) generates direct analog waveform on the pin without the need for external sample and hold circuit.
Please refer page number 473 in the PSoC 6 Architecture TRM given in the link below:
You can also look at readily available code example CE220924-PSoC 6 MCU VDAC sinewave generator using DMA.
If you are aware of the above method and still want to generate sine wave using UDB, please tell us the reason for it.
Could you please elaborate more on BLE waveform generator? What is your application requirement?
Above issue has been solved.