4f3bcbbb11
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14624 a1c6a512-1295-4272-9138-f99709370657
56 lines
1.6 KiB
C
56 lines
1.6 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) 2006 by Barry Wardell
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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 "adc.h"
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#include "kernel.h"
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#include "i2c-pp.h"
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#include "as3514.h"
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static struct mutex adc_mutex NOCACHEBSS_ATTR;
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/* Read 10-bit channel data */
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unsigned short adc_read(int channel)
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{
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unsigned short data = 0;
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if ((unsigned)channel < NUM_ADC_CHANNELS)
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{
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spinlock_lock(&adc_mutex);
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/* Select channel */
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if (pp_i2c_send( AS3514_I2C_ADDR, ADC_0, (channel << 4)) >= 0)
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{
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unsigned char buf[2];
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/* Read data */
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if (i2c_readbytes( AS3514_I2C_ADDR, ADC_0, 2, buf) >= 0)
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{
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data = (((buf[0] & 0x3) << 8) | buf[1]);
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}
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}
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spinlock_unlock(&adc_mutex);
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}
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return data;
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}
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void adc_init(void)
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{
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spinlock_init(&adc_mutex);
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}
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