Does DSPLIB-C67x have the windowing function of FFT algorithm?

We don`t provide Windowing function in DSPLIB as the loops are simple enough to implement in C and the compiler does a good job provided you provide the correct _nassert and PRAGMA statements to guide the compiler.

For example the 2k sample hanning window implementation would be :

vecSize =2048;

_nassert(vecSize % 8 == 0 ); // window size is always multiple of 8
_nassert(vecSize > 0); // window size is always greater than 0
_nassert((int)DataOut % 8 == 0); // data is double word aligned
_nassert((int)DataInput % 8 == 0); // data is double word aligend

#pragma MUST_ITERATE(64,8192,64);
for ( i = 0; i < vecSize; i++) {
double mult= 0.5 * (1 - cos(2*PI*i/2047));
DataOut[i] = mult * DataInput[i];
}

BAsed on the implementation described here:
en.wikipedia.org/.../Hann_function

Add restricts to input and output data and the compiler should generate optimized data.

Regards,
Rahul

PS: Look at path for least resistance to optimize DSP code:

www.ti.com/.../sprabf2.pdf