AnsweredAssumed Answered

FFT on STM32F4

Question asked by nguyen.nhan.002 on Oct 8, 2014
Latest reply on Oct 9, 2014 by nguyen.nhan.002

Iam trying to use DSP lib on STM32F4 chip. I run the example project of FFT on CMSIS lib and it's ok:

an float array ==> FFT ==> result   it's ok.

But I try on my board:

Signal generator => external ADC => FFT on STM32F4 => result 

it's wrong and when I change input signal (sine 1Khz, 2Khz, 3Khz...), the result didnot change. 
The difference between 2 program is the input of example project is an float array, but other is signed short int array. Am I wrong in this step? Please show me the solution.
Any help will be appreciated, Thanks in advance.