How to check how long code takes to run?

jseidmann · Joined: 04 Nov 2004 Posts: 67

Hi, I wanted to know what ways there are to find out how long a section of code will take to run. I have an EEPROM connected and can store that time value in it to access later on. Is there a command that can store the time delayed between two points? What means have all of you used to see how long your code takes to execute some portion?

Jon

NikkiC · Joined: 21 Jun 2004 Posts: 3 Location: London, UK

Three ways: using an oscilloscope, using the simulator in MPLAB or simply counting the number of clock cycles required to execute any chunk of code.

Nikki

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

See this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=20463

kender · Joined: 09 Aug 2004 Posts: 768 Location: Silicon Valley

Set up a timer interrupt. Count the interrupts in the ISR. Sample the counter before and after the code of interest executes (assumption: code of interest is not inside another ISR). Calculate the difference of the counter and store it in the EEPROM.

Nick