measuring time - DSP 674

Alla,

There is no DSP 674. Which device do you mean to ask about?

Which board are you using, your own or an EVM?

What kind of time do you want to measure, GMT or DSP clock cycles or between two events or other?

Regards,
RandyP

RandyP,

I'm using netra ti 816x , the dsp core is c674x. I'm using 3'rd party board (z3).

I want to measure DSP clock cycles of some functions. 

Thanks,

Alla.

Alla,

You can use the following in some cases:

#include <c6h.x>

unsigned int uCalTime, ulStartTime, uEndTime, uBenchTime;

main()
{

 TSCL = 0;

 ullStartTime = TSCL;
 ullCalTime = TSCL;
 ullCalTime -= ullStartTime;

 ullStartTime = TSCL;
 <code to be measured>
 ullEndTime = TSCL;
 ullBenchTime = ullEndTime - ullStartTime - ullCalTime;

}

But the TSC (described in CPU & Instruction Set Reference Guide) is 64-bits, while just the TSCL half will overflow every 4G cycles. If this is a problem, then you will need to use a full 64-bit access. The version above is useful in most cases.

Regards,
RandyP

If you need more help, please reply back. If this answers the question, please click  Verify Answer  , below.

Thank you very much, it is very helpful.