68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2002 by Linus Nielsen Feltzing
|
|
*
|
|
* All files in this archive are subject to the GNU General Public License.
|
|
* See the file COPYING in the source tree root for full license agreement.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
#include "i2c.h"
|
|
#include "debug.h"
|
|
#include "dac.h"
|
|
|
|
int dac_volume(unsigned int volume)
|
|
{
|
|
int i;
|
|
unsigned char buf[16];
|
|
|
|
if(volume > 0x38)
|
|
volume = 0x38;
|
|
|
|
i=0;
|
|
buf[i++] = DAC_REG_WRITE | DAC_AVOL;
|
|
buf[i++] = (volume & 0x3f) | 0x40; /* Deemphasis ON */
|
|
buf[i++] = volume & 0x3f;
|
|
|
|
/* send read command */
|
|
if (i2c_write(DAC_DEV_WRITE,buf,i))
|
|
{
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/******************************************************************
|
|
** Bit6: 0 = 3V 1 = 5V
|
|
** Bit5: 0 = normal 1 = low power
|
|
** Bit4: 0 = AUX2 off 1 = AUX2 on
|
|
** Bit3: 0 = AUX1 off 1 = AUX2 on
|
|
** Bit2: 0 = DAC off 1 = DAC on
|
|
** Bit1: 0 = stereo 1 = mono
|
|
** Bit0: 0 = normal right amp 1 = inverted right amp
|
|
******************************************************************/
|
|
int dac_config(int value)
|
|
{
|
|
int i;
|
|
unsigned char buf[16];
|
|
|
|
i=0;
|
|
buf[i++] = DAC_REG_WRITE | DAC_GCFG;
|
|
buf[i++] = value;
|
|
|
|
/* send read command */
|
|
if (i2c_write(DAC_DEV_WRITE,buf,i))
|
|
{
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|