| 1 | /*
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| 2 | * Copyright (c) 2011 Jan Vesely
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 | /** @addtogroup drvaudiosb16
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| 29 | * @{
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| 30 | */
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| 31 | /** @file
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| 32 | * @brief DSP helper functions implementation
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| 33 | */
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| 34 |
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| 35 | #include <libarch/ddi.h>
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| 36 | #include "dsp.h"
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| 37 |
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| 38 | int dsp_play_direct(sb16_regs_t *regs, const uint8_t *data, size_t size,
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| 39 | unsigned sampling_rate, unsigned channels, unsigned bit_depth)
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| 40 | {
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| 41 | if (channels != 1 || bit_depth != 8)
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| 42 | return EIO;
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| 43 | /* In microseconds */
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| 44 | const unsigned wait_period = 1000000 / sampling_rate;
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| 45 | while (size--) {
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| 46 | pio_write_8(®s->dsp_write, DIRECT_8B_OUTPUT);
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| 47 | pio_write_8(®s->dsp_write, *data++);
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| 48 | udelay(wait_period);
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| 49 | }
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| 50 | return EOK;
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| 51 | }
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| 52 |
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| 53 | /**
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| 54 | * @}
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| 55 | */
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