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STM32F4 - FFT for 32768 input buffer

Question asked by nerbius on Oct 16, 2014
Latest reply on Oct 17, 2014 by fm
Hi everybody!

I'm going to use STM32f429 with external SDRAM (IS42S16400J 64MBit) in my project. I'm trying to make FFT for 32768 input buffer, my function calculate it in about 250ms.
Functions in CMSIS LIB do it much quicker but support only length 128, 512, 2048. How can I do long FFT with good performance?