69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
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/***************************************************************************
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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 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 "config.h"
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#include "cpu.h"
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#include "system.h"
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#include "kernel.h"
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#include "thread.h"
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#include "adc.h"
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#include "pcf50606.h"
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static unsigned char adcdata[NUM_ADC_CHANNELS];
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static int channelnum[] =
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{
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5, /* ADC_BUTTONS (ADCIN2) */
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6, /* ADC_REMOTE (ADCIN3) */
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0, /* ADC_BATTERY (BATVOLT, resistive divider) */
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};
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unsigned char adc_scan(int channel)
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{
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unsigned char data;
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pcf50606_write(0x2f, 0x80 | (channelnum[channel] << 1) | 1);
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data = pcf50606_read(0x30);
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adcdata[channel] = data;
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return data;
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}
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unsigned short adc_read(int channel)
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{
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return adcdata[channel];
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}
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static int adc_counter;
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static void adc_tick(void)
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{
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if(++adc_counter == HZ)
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{
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adc_counter = 0;
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adc_scan(ADC_BATTERY);
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}
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}
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void adc_init(void)
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{
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adc_scan(ADC_BATTERY);
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tick_add_task(adc_tick);
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}
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