CH_Frequency and Time measurement driver STM32F4 discovery

[Faisal Mehmood]

I want to find the time in which my loop executes. I am using Time measurement driver. How is ch_frequency related to timing precision??
Curently Ch_frequency is set at 1000 and best time measurement gives 8550. This value increases to 36117 if I increase ch_frequency to 1,000,000.
I want as precise time as possible.
any suggesiton??
Regards

[Giovanni]

CH_FREQUENCY is unrelated.

Time measurement is performed using a real time counter with a resolution equal to the MCU clock.

Interrupts can affect measurements so if you need absolute precision then you need to measure while interrupts are disabled.

Giovanni

[Faisal Mehmood]

Thnx!