FFT implementation on FRDM k64F

abdurrehman98 — Thu, 19 Jan 2023 03:58:58 GMT

Hi, i am trying to implement fft on frdm k64f. I am using the complex.h to work on complex numbers. I have also used the newlibNano of NXP MCU expresso compiler. But still my code is slow. If anyone can recommend any FFT library or how to speed up FFT code.

while(1) {

r1p=0;
//i1p=0;
r2p=0;
//i2p=0;

GPIO_PortToggle(BOARD_INITPINS_ptc2_GPIO, 1u << BOARD_INITPINS_ptc2_PIN);
for (n = 0; n<((N/2)-1);n++)
{

//Index for even and odd
eveind = 2*n;
oddind=(2*n)+1;

//Input for sin and cos
ang= -((2*pi*k*n)/(N/2))*I;

expc=cexp(ang);

//Even Part
r1[0]= r1p +(x[eveind]*expc);

r1p=r1[0];

//Odd Part

r2[0]= r2p +(x[oddind]*expc);

r2p=r2[0];
//i2p=i1[0];

}

//Calculation for multiplication with odd part

//Calculation for e
angm=-((2*pi*k)/(N))*I;

//COnverting back to the rectangular form
r2_[0]= r2[0]*cexpf(angm);

// Adding odd and even parts of even and odd parts
rfft=(r1[0]+r2_[0])/(N/2);

//Amp of fft final answer

magfft=cabsf(rfft);

//Toggle GPIO
GPIO_PortToggle(BOARD_INITPINS_ptc2_GPIO, 1u << BOARD_INITPINS_ptc2_PIN);

}

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