CMSIS DSP - FFT / RFFT

Recently I've been trying to implement FFT provided in CMSIS-DSP libraries. And something strange happens - some of output array elements have values below 0. I am using arm_rfft_fast_f32 . According...
CMSIS DSP - FFT / RFFT

Recently I've been trying to implement FFT provided in CMSIS-DSP libraries. And something strange happens - some of output array elements have values below 0. I am using arm_rfft_fast_f32 . According...
RFFT CMSIS-DSP - Fluctuating index

I am using the Cortex M4 with CMSIS 5.4.0 DSP library. I'm using the arm_rfft_f32() function and the max_arm_f32() function to compute the maximum frequency bin of injected pure sine wave with an external...
RFFT CMSIS-DSP - Fluctuating index

I am using the Cortex M4 with CMSIS 5.4.0 DSP library. I'm using the arm_rfft_f32() function and the max_arm_f32() function to compute the maximum frequency bin of injected pure sine wave with an external...
CMSIS DSP RFFT - too much cycles

Hi, I use the CMSIS DSP library to calculate a f32 RFFT with a block size of 1024 . For this it takes 262823 cycles. I read in the white-paper that it should take 55538 cycles. Because of the measurement...