CCS/TMS320F28027: Unexpected execution time observed for IQdiv()

Ashwini,

Can you check if MATH_TYPE is set to IQ_MATH or FLOAT_MATH. It should be IQ_MATH. If it's FLOAT_MATH, the operations will call RTS library functions which take many cycles.

Thanks,

Sira

Thank you for your reply

Yes, it is set IQ_MATH not to FLOAT_MATH.

Ashwini,

Are they generating the right results? I would like you to verify that first. Please use some simple input values and generate the outputs for IQDiv and IQMpy, and let me know the results you are getting. Then we can troubleshoot the cycles.

Thanks,

Sira

Sira,

Yes,the results are coming right. I tried with following value 

Operand 1= 1.0 & Operand 2 = 0.1  & results were 0.0999999642 for IQmpy & 10.0000029 for IQdiv

One thing i also forgot which is to call InitFlash() function in my code & after calling this function my execution time reduce to 10us from 45us.

But still it's not achieving the execution cycles mention in IQmath  library document. 

Ashwini,

OK, that's good. Can you try profiling the C2000Ware IQMath example project (C2000Ware_3_02_00_00\libraries\math\IQmath\c28\examples\C\2806x)? See if you get similar results. I don't have F2806x hardware, but I ran the corresponding project on F2837x and _IQDiv measures 77 cycles (higher than 63 cycles mentioned in the user guide), but close. Plus I ran with optimization off.

Thanks,

Sira