ex_dsqrfft.c

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#include "examples_doc_sq.h"
#include "dsp.h"

#define VLENGTH 8

int main(void)
{
    ippsq_status status;
    ippsq_rfft_instance_q15 S;
    ippsq_cfft_instance_q15 Cfft;
    q15_t        src[VLENGTH] = { 16000, 0, -16000, 0, 16000, 0, -16000, 0 };
    q15_t        spectrum[VLENGTH + 2];
    uint8_t      buffer[sizeof(q15_t) * VLENGTH / 4];

    printf_v16s("src =\n", " %d", src, VLENGTH);

    S.pCfft = &Cfft;
    CHECK_STS( status = ippsq_rfft_init_q15(&S, VLENGTH, 0, 1, buffer) )
    printf_v16s("buffer sin(0-PI/4] =\n", " %d", (q15_t*)buffer, S.fftLenReal / 4);
    QM_PRINTF("real fft length = %d\n", S.fftLenReal);
    QM_PRINTF("inverse flag = %d\n", S.ifftFlagR);
    QM_PRINTF("bit reverse flag = %d\n", S.bitReverseFlagR);

    ippsq_rfft_q15(&S, src, spectrum);

    printf_v16s("spectrum = \n", " %d", spectrum, S.fftLenReal + 2);

EXIT_MAIN
    CONTROL_RETURN;
}
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