www.pudn.com > virtual_gameboy-0.8.8.zip > FMFREQS.C

/* FmFreqs.c 
   This file is part of the VGB-DOS project 
   Copyright (C) Marcel de Kogel (m.dekogel@student.utwente.nl),  1996 
    Markus F.X.J. Oberhumer (markus.oberhumer@jk.uni-linz.ac.at), 1996 
   You may not use this file for commercial purposes 
   Please notify me if you make any changes to this file */ 
 
#include  
#include  
 
int main (void) 
{ 
	int i; 
	int b, bestb; 
	double v, minv; 
        int f, bestf; 
	double realfreq, adlibfreq; 
	FILE *file; 
 
	file = stdout; 
	for (i = 2048; i >= 1; i--) 
	{ 
		minv = 10000; bestb = 0; bestf = 0; 
		realfreq = 4194304.0 / (32*i); 
		for (b = 0; b < 8; b++) 
		{ 
                        f = floor (realfreq / (50000.0 * pow(2,b-20)) + 0.5); 
			if (f > 1023) 
				continue; 
			adlibfreq = 50000.0 * f * pow(2,b-20); 
			v = fabs(realfreq - adlibfreq); 
			if (v < minv) 
			{ 
				minv = v; 
				bestb = b; 
				bestf = f; 
			} 
		} 
                fprintf(file,"%1d, %4d,     /* %8.2f */\n", 
                        bestb, bestf, minv); 
	} 
	 
	return 0; 
}