57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <math.h>
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#define DATA_L (1<<16)
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#define FP_acc 1000
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#include "FFT_FP_realisation.h"
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void imagery2abs(int64_t* inp, uint32_t inp_L, int64_t *out){
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printf("+++++++++++++++++++++\n");
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printf("calculating abs^2\n");
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for (uint32_t i = 0; i < inp_L; ++i){
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int64_t re = inp[i*2];
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int64_t im = inp[i*2 +1];
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int64_t val = (re * re + im * im) / FP_acc;
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printf("%lld\n", (long long)val);
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out[i] = val;
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}
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}
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void data_generator(int64_t* X, int64_t* Y, uint32_t N){
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for (int i = 0; i < N; ++i){
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X[i] = (int64_t)i;
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Y[i] = lround(sin(((double)i)*2.0* PI/(N/10))*FP_acc);
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Y[i] += 1*FP_acc;
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}
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}
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void main(){
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char* logfilename = "tmp";
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int64_t data_X[DATA_L] = {0,};
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int64_t data_Y[DATA_L] = {0,};
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int64_t data_res_FFT_imag[DATA_L*2] = {0,};
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int64_t data_res_FFT_abs[DATA_L] = {0,};
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fft_fp_prepare();
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data_generator(data_X, data_Y, DATA_L);
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FFT_fp(data_Y, DATA_L, data_res_FFT_imag);
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imagery2abs(data_res_FFT_imag, DATA_L, data_res_FFT_abs);
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FILE *logfile_ptr;
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logfile_ptr = fopen(logfilename, "w");
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fprintf(logfile_ptr, "X, Y, FFT\n");
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for (uint32_t i = 0; i < DATA_L; ++i){
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fprintf(logfile_ptr, "%lld, %lg, %lg \n", (long long)data_X[i], ((double)data_Y[i])/(double)FP_acc , (double)data_res_FFT_abs[i]/(double)FP_acc);
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}
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fclose(logfile_ptr);
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}
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