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I am having a baremetal program running on a ARM cpu which is processing interrupts of a real time application. Power is also a constraint, so i am thinking of playing with the frequency of that particular CPU. Is there a way with which i can predict the change ( in interrupt latency or the jitter in the interrupt latency) i can expect when i change the frequency. I know i can do this manually by implementing it and measuring it, but i would like to know whether there is a logical or mathematical way to do this.

Thanks.

Regards, N

Nuetrino
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Yes. Just search for interrupt latency related to your architecture in official ARM docs. I.e. Interrupt latency calculation

Adi
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  • Unfortunately I am not able to find this information for Arm Cortex A9 architecture, But in the appendix there is some information about clock cycles consumed by instructions, I will have a look. Thanks for the pointer – Nuetrino Nov 11 '13 at 08:54