Compiler/TMS320F28377S: CCS division function

Naveen Reddy

Part Number: TMS320F28377S

Tool/software: TI C/C++ Compiler

Hello all,

I am currently working on Incremental Conductance MPPT algorithm. I need a floating point "division" math operation for computing delta power and delta voltage . In present library there are two math functions

for division "div ,ldiv" which supports integer and long number format. The present MPPT algorithm uses "__einvf32" which is not giving accurate results. Need a floating point library function for division because my source file is in float format.

Any help is appreciated.

Regards

Naveen

over 6 years ago

0 Tomasz Kocon over 6 years ago

Guru 26200 points

Hello,
your MCU has FPU.
Try this:
int main(void)
{
float fa1 = 1.0, fa2 = 2.0, fa3;

fa3 = fa1 * fa2;
return 0;
}

0 Naveen Reddy over 6 years ago in reply to Tomasz Kocon

Intellectual 520 points

Hi Tom,

Thank you for the reply.

Sure i will try the source.But does this source performs 32 bit division operation?

Regards

Naveen

0 Tomasz Kocon over 6 years ago in reply to Naveen Reddy

Guru 26200 points

Your MCU has FPU + TMU.

0 George Mock over 6 years ago in reply to Naveen Reddy

TI__Guru**** 249780 points

Naveen Reddy said:
this source performs 32 bit division operation?

You can write a floating division expression ...

float_val1 / float_val2

... and have that be evaluated with a single divide instruction. I presume you use the appropriate compiler switches for your device ...

-v28 -ml -mt --cla_support=cla1 --float_support=fpu32 --tmu_support=tmu0 --vcu_support=vcu2

When you set up a new project for TMS320F28377S in CCS, it chooses all those compiler options for you. You need to manually add one more: --fp_mode=relaxed. Please read more about the option --fp_mode in the C28x compiler manual.

Thanks and regards,

-George

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Compiler/TMS320F28377S: CCS division function