u-boot/drivers/sound/sound.c
Simon Glass f7ae49fc4f common: Drop log.h from common header
Move this header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
2020-05-18 21:19:18 -04:00

38 lines
815 B
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2012 Samsung Electronics
* R. Chandrasekar <rcsekar@samsung.com>
*/
#include <common.h>
#include <log.h>
#include <sound.h>
void sound_create_square_wave(uint sample_rate, unsigned short *data, int size,
uint freq, uint channels)
{
const unsigned short amplitude = 16000; /* between 1 and 32767 */
const int period = freq ? sample_rate / freq : 0;
const int half = period / 2;
assert(freq);
/* Make sure we don't overflow our buffer */
if (size % 2)
size--;
while (size) {
int i, j;
for (i = 0; size && i < half; i++) {
size -= 2;
for (j = 0; j < channels; j++)
*data++ = amplitude;
}
for (i = 0; size && i < period - half; i++) {
size -= 2;
for (j = 0; j < channels; j++)
*data++ = -amplitude;
}
}
}