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measure execution time

 
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hamid9543



Joined: 31 Jan 2013
Posts: 63

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measure execution time
PostPosted: Sat Jan 19, 2019 11:05 am     Reply with quote
I am trying to find the best way to measure execution time of a specific section of code.
is there any function ?
dluu13



Joined: 28 Sep 2018
Posts: 395
Location: Toronto, ON

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PostPosted: Sat Jan 19, 2019 11:34 am     Reply with quote
Something I've done is to output high to a pin before the code and low after. Use an oscilloscope to capture the pulse on that pin, and use the cursor.
temtronic



Joined: 01 Jul 2010
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PostPosted: Sat Jan 19, 2019 11:49 am     Reply with quote
best way ?

we all have OUR 'best way'...

I prefer to dump the listing, highlight the 'specific section of code', referenece the PIC's instruction set and then calculate the time. With 'lower end' PICs, a 4MHz xtal gives a 1us execute time per most instructions. Easy to recallculate for say a 20MHz xtal, the time will be 5 times faster.

The scope method will work but depends on how good($$$) a scope you have and IF if has been calibrated !!

Jay
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Jan 19, 2019 12:58 pm     Reply with quote
The MPLAB vs. 8.92 Stopwatch feature can be used to measure how
many cycles (and microseconds) it takes to execute a block of code:
http://www.ccsinfo.com/forum/viewtopic.php?t=38351

Mplab X stopwatch:
https://www.youtube.com/watch?v=zt44UxcpUlc
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