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STM32F4 Cycles Fluctuation With Network

Question asked by widi.rama on Jul 13, 2017


I have STM32F4 running with FreeRTOS and LwIP for networking library. I want to know how much cycle that STM32F4 needs when it receive a network packet (such as Ping). So I use DWT to measure that. When I ping the STM32F4 and it shows me around 3000 cycles, but after 3-5 times pings it shows me around 6000 cycles after that it shows 3000 cycles. It happen repeatedly. Why this condition happens? I just curious with this

Here is my code and my result screenshoot..