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FFT Metering on Cortex-M4

Question asked by Shmuel Branover on Oct 23, 2017
Latest reply on Nov 6, 2017 by Shmuel Branover

Is there any information about the function performance for the FFT-Based Metering Algorithms using the Cortex-M4?


AN4255 only has info for CM0+ and CM0+ with MMAU.


It seems to me that the performance is far worse on the M4 than on the M0+ with MMAU. 


Most noticeably the following functions seem to be taking a long time: