Colony

#include <math.h>

#include <stdio.h>

#include <stdlib.h>

#include "serial.h"

#define X_IN 0

#define Y_OUT 1

#define FP_COS 2

#define FP_SIN 3

#define FP_TAN 4

#define EXIT 5

typedef union fp_t { 

        char d[4];

        int v;

} fp_t;

int main(int argc, char** argv) { 

        int fd, i, n = 0;

        float input, output, error, avg_error, max_error;

        fp_t fp_input, fp_output;

        fd = openport("/dev/ttyUSB0");

        printf("Beginning test loop.");

        while(1) {

                switch(getbyte(fd)) { 

                case X_IN:

                        for(i=0; i < 4; i++)

                                fp_input.d[i] = getbyte(fd);

                        input = ((float)fp_input.v) / 65536.;

                        break;

                case Y_OUT:

                        for(i=0; i < 4; i++)

                                fp_output.d[i] = getbyte(fd);

                        output = ((float)fp_output.v) / 65536.;

                        break;

                case FP_COS: 

                        n++;

                        printf("%f = cos(%f)\n", output, input);

                        error = abs(cos(input) - output);

                        if(error > max_error) max_error = error;

                        avg_error = (avg_error * (n - 1) + error) / n;

                        break;

                case FP_SIN:

                        break;

                case FP_TAN:

                        break;

                case EXIT:

                        printf("Average error: %f\n", avg_error);

                        printf("Max error: %f\n", max_error);

                        exit(EXIT_SUCCESS);

                        break;

                default: break;

                        printf("Uh oh - defauled\n");

                        break;

                }

        }

}