How do I measure microseconds?

Kyle Johnson

I am trying to measure, in microseconds, the time it takes for a segment of code to run but I am not sure what a good method/function is to use to do this.

I started with the example code Example_F2802xAdcTempSensor.c.

I have tried several different methods, the best of which is supposed to me using gettimeofday() which is located in <sys/time.h>. However, <sys/time.h> does not exist.

Is there a different function or method I should use? Or is there some way I can include this file?

Thank you very much for your help.

over 11 years ago

0 Brett Larimore over 11 years ago

TI__Guru 57255 points

Kyle,

I would recommend using the profile clock in CCS as a good first pass estimate. I also use GPIOs pretty frequently.

See the following link:
http://processors.wiki.ti.com/index.php/Profiling_on_C28x_Targets

Thank you,
Brett

0 Kyle Johnson over 11 years ago in reply to Brett Larimore

Prodigy 50 points

Ok thank you, I will give that a try.

Is there no equivalent function to gettimeofday() then?

0 Brett Larimore over 11 years ago in reply to Kyle Johnson

TI__Guru 57255 points

Kyle,

Not directly. Such a function would be built around a Real Time Clock peripheral (which the C28x device series does not have) or would involve queuing a running Timer (which is similar to the CpuTImer approach in the wiki link I sent).

Thank you,
Brett

0 Igor Gorbachev over 11 years ago in reply to Brett Larimore

Guru 20525 points

HI, Brett!

Excuse me, but could you please comment this thread (there is strange problem with CLA examples, I have tried all and I have not ideas more) http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/308954.aspx.

Many thanks,

Igor

C2000™︎ microcontrollers

C2000 microcontrollers forum

How do I measure microseconds?