Why does this code produce this result?

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hi folks,

i'm newbie looking guidance following code.  produces intermittent tone (beep, beep, beep) goes on 6 seconds (about 13 beeps).  i've played values playtone , duration still receive beeping result.  result i'm looking single half-second tone (beep).  can guide me here?  in advance take time!  appreciate it  :)

void playtone(long duration, int freq) {
    duration *= 1000;
    int period = (1.0 / freq) * 1000000;
    long elapsed_time = 0;
    while (elapsed_time < duration) {
        digitalwrite(pinspeaker,high);
        delaymicroseconds(period / 2);
        digitalwrite(pinspeaker, low);
        delaymicroseconds(period / 2);
        elapsed_time += (period);
    }
}

post code.


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