1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2012 Samsung Electronics
4 * R. Chandrasekar <rcsekar@samsung.com>
10 void sound_create_square_wave(unsigned short *data, int size, uint32_t freq)
12 const int sample = 48000;
13 const unsigned short amplitude = 16000; /* between 1 and 32767 */
14 const int period = freq ? sample / freq : 0;
15 const int half = period / 2;
19 /* Make sure we don't overflow our buffer */
25 for (i = 0; size && i < half; i++) {
30 for (i = 0; size && i < period - half; i++) {