e1cb054fa0
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1147 a1c6a512-1295-4272-9138-f99709370657
74 lines
2 KiB
C
74 lines
2 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) 2002 by Linus Nielsen Feltzing
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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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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#include "i2c.h"
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#include "debug.h"
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#include "dac.h"
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int dac_volume(unsigned int volume)
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{
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int ret = 0;
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unsigned char buf[3];
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i2c_begin();
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if(volume > 0x38)
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volume = 0x38;
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buf[0] = DAC_REG_WRITE | DAC_AVOL;
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buf[1] = (volume & 0x3f) | 0x40; /* Deemphasis ON */
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buf[2] = volume & 0x3f;
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/* send read command */
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if (i2c_write(DAC_DEV_WRITE,buf,3))
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{
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ret = -1;
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}
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i2c_end();
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return ret;
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}
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/******************************************************************
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** Bit6: 0 = 3V 1 = 5V
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** Bit5: 0 = normal 1 = low power
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** Bit4: 0 = AUX2 off 1 = AUX2 on
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** Bit3: 0 = AUX1 off 1 = AUX2 on
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** Bit2: 0 = DAC off 1 = DAC on
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** Bit1: 0 = stereo 1 = mono
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** Bit0: 0 = normal right amp 1 = inverted right amp
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******************************************************************/
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int dac_config(int value)
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{
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int ret = 0;
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unsigned char buf[2];
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i2c_begin();
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buf[0] = DAC_REG_WRITE | DAC_GCFG;
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buf[1] = value;
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/* send read command */
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if (i2c_write(DAC_DEV_WRITE,buf,2))
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{
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ret = -1;
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}
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i2c_end();
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return 0;
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}
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