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STM32f407 routine elapsed time

Question asked by ASSAAD on Dec 4, 2014
Latest reply on Dec 7, 2014 by ASSAAD
Hello  Everyone ;
I am trying to learn the time elapsed for FIR filter with 100 taps in stmd32f407 ; we use keil ; we use simulator of keil in Xtal region should we put the CPU speed clock or the external clock for example in our board we use 8MHZ but we run at speed 168MHZ ; does the keil simiulation time is near to real World?
any other way to learn the elapsed time of a function in real time ? that is important and critical for us .
Thank you