FIR Filter Explanation

you say you dont see the sinewave. I would expect to see at least some periodic signal of the same frequency. If not, then I would try the following:

A)Check your adc is actually supplying data and you DAC is showing them! So maybe make a pass through of the adc data through a register, directly to the dac.

B)modify your wildly oversampled FIR bandpass filter to a simple lowpasss filter of say some MHz cutoff. Your adc signal must come through then.

Note that the FIR filter has some flow control pins. Obviously you need to set them correctly.

Another thing which can cause troubles is the scaling (gain) in the filter.