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#include <stdio.h>
#include <unistd.h>
#include <limits.h>
#include <error.h>
#include <errno.h>
#include <math.h>
#define SAMPLES_PER_PERIOD (32)
static short waveform_array[SAMPLES_PER_PERIOD];
int main(void) {
int i;
int result;
short wave_temp;
float next_point = M_PI / 2;
float next_increment = (2 * M_PI) / SAMPLES_PER_PERIOD;
wave_temp = SHRT_MAX;
for(i = 0 ; i < (SAMPLES_PER_PERIOD) ; i++) {
wave_temp = SHRT_MAX * sin(next_point);
waveform_array[i] = wave_temp;
next_point += next_increment;
}
result = write(STDOUT_FILENO, &waveform_array, sizeof(waveform_array));
if (result < 0) {
error(1, errno, "writing to stdout");
}
if (result != sizeof(waveform_array)) {
error(1, 0, "failed to write %d bytes to stdout, only wrote %d bytes", sizeof(waveform_array), result);
}
return 0;
}
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