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pcm.c
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pcm.c
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/*
* pcm.c
*
* Copyright (c) 2014 Jeremy Garff <jer @ jers.net>
* PCM version Copyright (c) 2016 Ton van Overbeek <tvoverbeek @ gmail.com>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
* 3. Neither the name of the owner nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <stdint.h>
#include "pcm.h"
// Mapping of Pin to alternate function for PCM_CLK
const pcm_pin_table_t pcm_pin_clk[] =
{
{
.pinnum = 18,
.altnum = 0,
},
{
.pinnum = 28,
.altnum = 2,
},
};
// Mapping of Pin to alternate function for PCM_FS
const pcm_pin_table_t pcm_pin_fs[] =
{
{
.pinnum = 19,
.altnum = 0,
},
{
.pinnum = 29,
.altnum = 2,
},
};
// Mapping of Pin to alternate function for PCM_DIN
const pcm_pin_table_t pcm_pin_din[] =
{
{
.pinnum = 20,
.altnum = 0,
},
{
.pinnum = 30,
.altnum = 2,
},
};
// Mapping of Pin to alternate function for PCM_DOUT
const pcm_pin_table_t pcm_pin_dout[] =
{
{
.pinnum = 21,
.altnum = 0,
},
{
.pinnum = 31,
.altnum = 2,
},
};
const pcm_pin_tables_t pcm_pin_tables[NUM_PCMFUNS] =
{
{
.pins = pcm_pin_clk,
.count = sizeof(pcm_pin_clk) / sizeof(pcm_pin_clk[0]),
},
{
.pins = pcm_pin_fs,
.count = sizeof(pcm_pin_fs) / sizeof(pcm_pin_fs[0]),
},
{
.pins = pcm_pin_din,
.count = sizeof(pcm_pin_din) / sizeof(pcm_pin_din[0]),
},
{
.pins = pcm_pin_dout,
.count = sizeof(pcm_pin_dout) / sizeof(pcm_pin_dout[0]),
},
};
int pcm_pin_alt(int pcmfun, int pinnum)
{
if (pcmfun < 0 || pcmfun > 3) {
return -1;
}
const pcm_pin_tables_t *pintable = &pcm_pin_tables[pcmfun];
int i;
for (i = 0; i < pintable->count; i++)
{
if (pintable->pins[i].pinnum == pinnum)
{
return pintable->pins[i].altnum;
}
}
return -1;
}