CFFT with ADC input

A revision of the library will be released before the end of the year, however it is unlikely there will be a CFFT_adc_f32 function. Since the adc inputs are real it would be efficient to do a real FFT. Is there a specifc reason you want to run a complex FFT on real data?

A possible workaround is to take the real adc input, convert to float and save it to a buffer and then immediately append a zero right after as the imaginary part. IN_BUFFER = {ADC(0), 0, ADC(1), 0, ADC(2),0 ..............ADC(N-1),0} and then feed this complex input to the CFFT function

I will sample I&Q data from a sensor simultaneously with 2 adc channels. I want to run a complex FFT on complex data.

Just like the library has a real fft function rfft_adc_f32 for uint adc input, I expect the library to have a complex fft function cfft_adc_f32 function for I&Q uint adc input data from two adc channels.

I can do something similar to your solution to convert both adc channels in C: IN_BUFFER = {ADC1(0), ADC2(0), ADC1(1), ADC2(1), ADC1(2),ADC2(2) ..............ADC1(N-1),ADC2(N-1)} and feed this to the CFFT function. But I presume the assambly code of the library can convert from uint to float more efficiently.


Regards,
Chris