FFT for captured signals in ultrasonic sensor

Mr CraigG

Thank you in advance

i am currently working on Project of ultrasonic Signal measurement . i am sending pulse from blackfin514f16 processor to ultrasonic sensor and getting back the echo pulse through analog fron end. now i need to do FFT for captured Signals to do time measurement. could you please guide me how to make it up....because i am new for dsp processor.....

thanks

tamil