calculation of energy consumption

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bizoo

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site:www.edaboard.com energy consumption

Hi, i am not a man of embedded system but i need to quantify the enrgy consumption for some calculation which are done in embedded sytems.

I have a program in my device which do simple algebraic operation like addition, sub and multiplication, and want to know how i can quantify the energy consumtpion. I have a fair idea that it depends upon the type of processor, clock speed, memory access pattern. Can some one provide me the exact technique or some references


thanking in anticipation
 

Hi bizoo,

the easiest and absolutly correct way is to measure the current which flows into your processor, then multiply everything with the operating voltage of your processor, and thats it. (Ok, don't think of leackage current trhough pins, periphales which are enabled inside your processor, operating temperature and so on)

easy isn't it ?

Another approach:
check the data sheet of the used processor for a specification like xx mA/MIPS, then you have to determine how many clock cycles your code need to execute, how often this will happen and after all you can make a estimation. No so easy...

Regards,
Mr_Programmer
 

There are tools out there that will help you measure it in real time as well. IAR has power debugging in their embedded work bench tool. Another cool one that is free is Energy Micro's energyAware Profiler. Using this software tool with their starter kit, you can let the tool take the energy measurements for you. It also measures/displays the average current over the time horizon you run the measurements.
 

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