blob: b8be34d9c587a154dbe9a65396580c4b5b5b3f48 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
#include <stdio.h>
#include <unistd.h>
#include <limits.h>
#include <error.h>
#include <errno.h>
#define SAMPLES_PER_PERIOD (32)
static short waveform_array[SAMPLES_PER_PERIOD];
int main(void) {
int i;
int result;
short wave_temp;
long increment = (SHRT_MAX - SHRT_MIN) / (SAMPLES_PER_PERIOD / 2);
wave_temp = SHRT_MAX;
increment = increment * -1;
for(i = 0 ; i < (SAMPLES_PER_PERIOD) ; i++) {
if (i == (SAMPLES_PER_PERIOD / 2)) {
wave_temp = SHRT_MIN;
increment = increment * -1;
}
waveform_array[i] = wave_temp;
wave_temp += 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;
}
|
