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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
40 lines
862 B
C
40 lines
862 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2012 Samsung Electronics
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* R. Chandrasekar <rcsekar@samsung.com>
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*/
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#include <common.h>
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#include <log.h>
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#include <sound.h>
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void sound_create_square_wave(uint sample_rate, unsigned short *data, int size,
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uint freq, uint channels)
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{
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const unsigned short amplitude = 16000; /* between 1 and 32767 */
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const int period = freq ? sample_rate / freq : 0;
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const int half = period / 2;
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if (!half) {
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memset(data, 0, size);
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return;
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}
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/* Make sure we don't overflow our buffer */
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if (size % 2)
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size--;
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while (size) {
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int i, j;
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for (i = 0; size && i < half; i++) {
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for (j = 0; size && j < channels; j++, size -= 2)
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*data++ = amplitude;
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}
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for (i = 0; size && i < period - half; i++) {
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for (j = 0; size && j < channels; j++, size -= 2)
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*data++ = -amplitude;
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}
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}
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}
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