CCS/EK-TM4C129EXL: CPU cycle disassembly, Time of an interrupt (ISR)

Arne Poelaert

Part Number: EK-TM4C129EXL

Tool/software: Code Composer Studio

Dear,

I wanted to see how long an interrupt routine takes to go through.
Which you apperently can check in disassembly:

Question:
What do the green numbers infront mean? (0000020a: and 0000020e:31)
When a number like 31 or 33 means a cycle is past? So for this interrupt 6 cycles past?
I use the tm4c129exl at 120MHz, so 1 cycle is then 1/(120*10^6)s?

Extra info:
Interrupt generated by a rising edge of a RS422 signal.
Used a breakpoint at the end of my interrupt

Already Thanks.

Arne

over 5 years ago

0 JohnS over 5 years ago

TI__Guru**** 161020 points

Arne,

0000020e is the address in memory where the instruction is

31 is the C source line number. The disassembly view is showing interleaved source and disassembly.

You can use the profile clock from the tools menu to count cycles.

Regards,

John

0 Arne Poelaert over 5 years ago in reply to JohnS

Prodigy 170 points

Thanks a lot!

So if I understand well it takes 34 cycles to get through the interrupt.
At 120MHz this gives 0.283µs?

0 JohnS over 5 years ago in reply to Arne Poelaert

TI__Guru**** 161020 points

Arne,

That calculation looks correct to me.

I found a doc that has a link to the video as well the conversion from cycles to time here:

http://dev.ti.com/tirex/explore/node?node=ACh7aaTRwDWC-8ORL0EHMg__FUz-xrs__LATEST

Regards,

John

0 Arne Poelaert over 5 years ago in reply to JohnS

Prodigy 170 points

Thanks a lot for helping me out John!!!

All my problems are solved.

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CCS/EK-TM4C129EXL: CPU cycle disassembly, Time of an interrupt (ISR)