6b13f685e
김민수
BSP 최초 추가
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#include <common.h>
#include <sound.h>
void sound_create_square_wave(unsigned short *data, int size, uint32_t freq)
{
const int sample = 48000;
const unsigned short amplitude = 16000;
const int period = freq ? sample / freq : 0;
const int half = period / 2;
assert(freq);
if (size % 2)
size--;
while (size) {
int i;
for (i = 0; size && i < half; i++) {
size -= 2;
*data++ = amplitude;
*data++ = amplitude;
}
for (i = 0; size && i < period - half; i++) {
size -= 2;
*data++ = -amplitude;
*data++ = -amplitude;
}
}
}
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