TMS320F28377D: sin and cos functions not working as expected

Part Number: TMS320F28377D

Hello,

I am trying to execute abc to dq transformation in TMS320F28377D processor using solar library in control suite. I get meaningful results for alpha and beta values, however d and q values are always zero. It is because sin and cos values are zero. Relevant code section is below.

    
    //Above these clarke transformation is performed.
    
    park1.alpha = clarke1.alpha;
    park1.beta  = clarke1.beta;
    park1.zero  = clarke1.zero;
    park1.sin   = (float)sin((spll1.theta[1]));
    park1.cos   = (float)cos((spll1.theta[1]));

    PARK_F_FUNC(&park1);

Function for park transformation is below.

void PARK_F_FUNC(PARK_F *v)
{
	v->d= v->alpha*v->cos + v->beta*v->sin;
	v->q=-v->alpha*v->sin + v->beta*v->cos;
	v->z=v->zero;
}

As it can be seen, in the debug section sin and cos values are always zero.

Edit: Theta values are added.

Theta values, as radian.

I also get the following warnings when I build the project.

• #225-D function "cos" declared implicitly
• #225-D function "sin" declared implicitly
• #225-D function "pow" declared implicitly

Thank you in advance.