PCM tone generator

Hey /prog/

I'm trying to teach myself how to generate PCM audio in C, and I can't figure out why this isn't generating a clear sine wave signal when I pipe it to aplay.  Any ideas?


#include <math.h>

#define MIDDLE_C 261.626
#define HZ 8000.0
#define ONE_CYCLE 2.0
#define PI 3.14159265

int main() {

    float frames = HZ / MIDDLE_C;
    float i;
    float n;
    unsigned int x;
    int s, v;

    for(v=0; v<MIDDLE_C; v++) {
        for(i=0; i<frames; i++) {
            n = (1 + sin((i / frames) * (PI * 2))) / 2;
            x = (int)round(0xFF * n);
            putchar(x);
        }
    }

    return 0;

}

>>8
I'm OP, >>2, and >>7