TMS320F28377D-EP:How to Calculate CPU Usage?

LEE Jea kyung

Prodigy 100 points

Part Number: TMS320F28377D-EP

I'm only using CPU1 of the 28377D.

I want to calculate the usage of CPU1. when the code is running.

I wonder if it is possible to calculate it in the following way

a. Measure the execution time by setting a "break" in the source code repetition statement

b. Measure execution time by setting "break" on the entire source code

CPU Usage = (a/ b) * 100

let me know if there is any other way

thank you..

over 2 years ago

0 Santosh Jha over 2 years ago

TI__Guru 50611 points

Hi,

With this approach, you can find how many cpu cycles takes to execute snippet of code. Please take a look at this link:

https://software-dl.ti.com/ccs/esd/documents/c2000_profiling-on-c28x-targets.html

https://software-dl.ti.com/ccs/esd/documents/ccs_counting_cycles.html

Also, you may want to check this white paper where it goes through benchmark and measurement strategy.

https://www.ti.com/lit/spracw5

Regards, Santosh

0 Sira Rao80 over 2 years ago in reply to Santosh Jha

TI__Mastermind 25930 points

CPU usage depends on how you are using the CPU. If your application has periodic interrupts which trigger ISRs, and then background functions that run during idle time, what are you interested in? Are you interested in knowing what % of the time the CPU spends running ISRs - is that your definition of CPU load?

Sometimes applications are written so that in idle time, some background function is always executing, so the CPU is never idle. The CPU might be spending 70% of its time running ISRs, and the remaining 30% running background functions in idle time. This could be considered as 70% CPU load.

Thanks,

Sira

C2000™︎ microcontrollers

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TMS320F28377D-EP:How to Calculate CPU Usage?