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root / trunk / code / projects / fp_math / test / server_test.c @ 1602

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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "serial.h"
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#define X_IN 0
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#define Y_OUT 1
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#define FP_COS 2
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#define FP_SIN 3
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#define FP_TAN 4
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#define EXIT 5
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typedef union fp_t { 
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        char d[4];
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        int v;
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} fp_t;
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int main(int argc, char** argv) { 
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        int fd, i, n = 0;
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        float input, output, error, avg_error, max_error;
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        fp_t fp_input, fp_output;
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        fd = openport("/dev/ttyUSB0");
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        printf("Beginning test loop.");
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        while(1) {
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                switch(getbyte(fd)) { 
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                case X_IN:
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                        for(i=0; i < 4; i++)
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                                fp_input.d[i] = getbyte(fd);
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                        input = ((float)fp_input.v) / 65536.;
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                        break;
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                case Y_OUT:
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                        for(i=0; i < 4; i++)
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                                fp_output.d[i] = getbyte(fd);
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                        output = ((float)fp_output.v) / 65536.;
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                        break;
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                case FP_COS: 
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                        n++;
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                        printf("%f = cos(%f)\n", output, input);
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                        error = abs(cos(input) - output);
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                        if(error > max_error) max_error = error;
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                        avg_error = (avg_error * (n - 1) + error) / n;
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                        break;
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                case FP_SIN:
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                        break;
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                case FP_TAN:
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                        break;
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                case EXIT:
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                        printf("Average error: %f\n", avg_error);
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                        printf("Max error: %f\n", max_error);
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                        exit(EXIT_SUCCESS);
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                        break;
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                default: break;
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                        printf("Uh oh - defauled\n");
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                        break;
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                }
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        }
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}
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