正在阅读：Linux下扬声器发声的小程序Linux下扬声器发声的小程序

    unsigned int freq_alert[]={
        2000, 2400, 0
    };
    unsigned int time_alert[]={
        50, 60
    };
    for(i = 0; i < 5; i++)
    {
        play(freq_alert, time_alert);
    }
    play(freq2, time2);
}

void play(unsigned int* freq, unsigned int* time)
{
    int i;
    for(i=0;freq[i]!=0;i++)
    {
        speaker(freq[i], time[i]);
    }
}

int speaker(unsigned int freq,unsigned int delay)
{ static int flag=0,bit;
    if(flag==0)
    {
        flag=1;
        iopl(3);
    }
    outb(0xb6,0x43);
    outb((freq & 0xff),0x42);
    outb((freq >> 8),0x42);
    bit=inb(0x61);
    outb(3 | bit,0x61);
    usleep(10000*delay);
    outb(0xfc | bit,0x61);
}