Highest priority interrupt latency

stevenh

Guru 20045 points

Other Parts Discussed in Thread: TMS320F28335

Hello,

The multiday workshop (http://processors.wiki.ti.com/index.php/C2000_Archived_Workshops - section 4) material for TMS320F28335 describes the interrupt latency to be 14 cycles for internal interrupts and 16 cycle for external interrupts.

Is there anyway it could be less than these values?

The reason I ask is that my code will be depending on the interrupt latency delay.

Also, what document describes the interrupt process?

Thanks,

Stephen

over 13 years ago

0 stevenh over 13 years ago

Guru 20045 points

In addition to my previous question, how much time does a return from ISR take?

0 stevenh over 13 years ago in reply to stevenh

Guru 20045 points

Did I post this question in the wrong section?

0 Mitja Nemec over 13 years ago in reply to stevenh

Genius 5885 points

Steven,

Take a look at http://processors.wiki.ti.com/index.php/Interrupt_FAQ_for_C2000. It might answer some questions.

0 stevenh over 13 years ago in reply to Mitja Nemec

Guru 20045 points

Hello Mitja,

Thanks for the information.

That web page has the same information I found before (C2000 Workshop Material and TMS320C28x CPU and Instruction Set Reference Guide).

I am looking for some information that will allow me to verify the minimum latency values described in C2000 Workshop Material.

Thanks,

Stephen

0 Manish Bhardwaj over 13 years ago in reply to stevenh

TI__Mastermind 43730 points

Steve,

the way to verify this will be to set a PWM counterin up count mode, let the PWM be set at CTR=zero and issue an intterupt at CTR-zero and then have the interrupt service routine force it to down, measuring this duty cycle and subtracting the assembly instruction of the ISR you will get the latency,

Regards

Manish Bhardwaj

C2000™︎ microcontrollers

C2000 microcontrollers forum

Highest priority interrupt latency