46 lines
1.9 KiB
C
46 lines
1.9 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2021 Aidan MacDonald
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __AIC_X1000_H__
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#define __AIC_X1000_H__
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#include "clk-x1000.h"
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#include <stdbool.h>
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/* Set frequency of I2S master clock supplied by AIC. Has no use if an
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* external DAC is supplying the master clock. Must be called with the
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* bit clock disabled.
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*
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* - clksrc can be one of EXCLK, SCLK_A, MPLL.
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* - This function does not modify PLL settings. It's the caller's job
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* to ensure the PLL is configured and runing.
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* - fs is the audio sampling frequency (8 KHz - 192 KHz)
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* - mult is multiplied by fs to get the master clock rate.
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* - mult must be a multiple of 64 due to AIC bit clock requirements.
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* - Note: EXCLK bypasses the decimal divider so it is not very flexible.
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* If using EXCLK you must set mult=0. If EXCLK is not a multiple of
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* the bit clock (= 64*fs), then the clock rate will be inaccurate.
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*
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* Returns zero on success and nonzero if the frequency is not achievable.
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*/
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extern int aic_i2s_set_mclk(x1000_clk_t clksrc, unsigned fs, unsigned mult);
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#endif /* __AIC_X1000_H__ */
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