Linux下扬声器发声的小程序

 #include <sys/io.h>
#include <unistd.h>

void play(unsigned int* freq, unsigned int* delay);

main()
{
    int i;
    unsigned int freq[]={ 330 , 392 , 330 , 294 , 330 , 392 ,
        330 , 394 , 330 , 330 , 392 , 330 ,
        294 , 262 , 294 , 330 , 392 , 294 ,
        262 , 262 , 220 , 196 , 196 , 220 ,
        262 , 294 , 330 , 262 , 0 } ;

    unsigned int time[]={ 50 , 50 , 50 , 25 , 25 , 50 ,
        25 , 25 , 100, 50 , 50 , 25 ,
        25 , 50 , 50 , 25 , 25 , 100,
        50 , 25 , 25 , 50 , 25 , 25 ,
        50 , 25 , 25 , 100 };

    unsigned int freq2[]={
        196,262,262,262,330,294,262,294,330,294,262,
        330,394,440,440,394,330,330,262,294,262,294,
        330,294,262,230,230,196,262,440,394,330,330,
        262,294,262,294,440,394,330,330,394,440,523,
        394,330,330,262,294,262,294,330,294,262,230,
        230,196,262,440,394,330,330,262,294,262,294,
        440,394,330,330,394,440,523,394,330,330,262,
        294,262,294,330,294,262,230,230,196,262,0
    };

    unsigned int time2[]={
        25,38,12,25,25,38,12,25,12,12,56,25,25,50,25,
        38,12,12,12,38,12,25,12,12,38,12,25,25,100,25,
        38,12,12,12,38,12,25,25,38,12,25,25,100,25,38,
        12,12,12,38,12,25,12,12,38,12,25,25,100,25,38,
        12,12,12,38,12,25,25,38,12,25,25,100,25,38,12,
        12,12,38,12,25,12,12,38,12,25,25,100
    };