How to convert 32bit ADC output values into Fast Fourier transform

I want to convert a 32-bit ADC output into FFT. Please help me out itz very much needed for my project

[Walter Roberson]

Are they in floating point "single" format? Are they in 32 bit unsigned integer representing the range 0 to 1 volt with resolution of 1/2^32 of a volt? Are they arriving in 32 bit unsigned integer format but need to be converted to 32 bit signed integer format?

[Swapna Havalgi]

actually 16 bit 16bit two inputs from ADC to apply to get fft which are signed

[Walter Roberson]

When those values arrive are they uint16() or int16() ? Whatever they are when they arrive, should they be interpreted as int16() signed 16 bit values? What voltage value does the all-0 bit pattern correspond to? What voltage value does the all-1 bit pattern correspond to? What voltage value is associated with if the first bit is 0 and the remaining 15 bits are all-1 ?