cordic_test.cpp

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#include <stdio.h>
#include <stdlib.h>
#include "read_file.h"

#include "cordic.h"

#define MAX_TEST_COUNT 110465
#ifndef TEST_COUNT
#define TEST_COUNT MAX_TEST_COUNT
#else
#if TEST_COUNT > MAX_TEST_COUNT
#error TEST_COUNT is above maximum
#endif
#endif

coord_t input_data[TEST_COUNT][2];
phase_t ref_results[TEST_COUNT][1];

int main(int argc, char** argv)
{
   printf("argc: %d\n", argc);
   coord_t inp_x, inp_y, out_x, out_y;
        phase_t inp_rad, out_rad;
        float res, ref_res;

        float diff, total_error = 0;

        int i;
        FILE *fp, *fm;

        //const float angle = M_PI_2/N;

        fp = fopen("./vector.dat", "w");
        if (fp == NULL) {
                fprintf(stderr, "unable to open output file\n");
        }
        fm = fopen("./check_res.m", "w");
        if (fm == NULL) {
                fprintf(stderr, "unable to open MATLAB ile\n");
        }
        fprintf(fm, "clear all; close all; clc;\n");
        fprintf(fm, "%%%%\n");
        fprintf(fm, "dat = load('vector.dat');\n");
        fprintf(fm, "diff = abs(dat(:,3) - dat(:,4));\n");
        fprintf(fm, "diff2= abs(dat(:,4) - dat(:,5));\n");
        fprintf(fm, "figure; plot(diff);  title 'error CORDIC vs. ATAN2'; grid;\n");
        fprintf(fm, "figure; plot(diff2); title 'error2'; grid;\n");
        fprintf(fm, "max_diff = max(diff)\n");
        fprintf(fm, "sum_abs_err = sum(diff)\n");
        fprintf(fm, "max_diff2 = max(diff2)\n");
        fprintf(fm, "sum_abs_err2 = sum(diff2)\n");

        //read files
        read_file<TEST_COUNT, 2, coord_t>("./input_data.txt", input_data);
        read_file<TEST_COUNT, 1, phase_t>("./ref_results.txt", ref_results);

        // vectoring mode
        inp_rad = 0;
        for (i = 0; i < TEST_COUNT; i++) {
                inp_y = (coord_t) input_data[i][0];
                inp_x = (coord_t) input_data[i][1];
                ref_res = (phase_t) ref_results[i][0];

                //void cordic (   bool mode,   coord_t x0,   coord_t y0,   phase_t z0,   coord_t *xn,   coord_t *yn,   phase_t *zn);
                //if ( (inp_y>0) & (inp_x>0) )
                {
                        // REF DESIGN
                        float c_atan2 = atan2f((float) inp_y, (float) inp_x);
                        // DUT
                        top_atan2(inp_y, inp_x, &out_rad);

                        //check results
                        diff = out_rad - ref_results[i][0];
                        if (diff < 0)
                                diff = 0 - diff; // take absolute value
                        total_error += diff;
                        fprintf(fp, "%20.10f %20.10f %20.10f %20.10f %20.10f\n",
                                        (float) inp_y, (float) inp_x, (float) out_rad,
                                        (float) ref_results[i][0], (float) c_atan2);
                        //fprintf(stderr, "%20.10f %20.10f %20.10f %20.10f\n", (float) inp_y, (float) inp_x, (float) out_rad, (float) ref_results[i][0]);
                }
        }

        fprintf(stderr, "total    error = %f\n", total_error);
        fprintf(stderr, "relative error = %f\n", total_error / TEST_COUNT);

        fclose(fp);
        fclose(fm);

        return 0;

}