84 lines
2.4 KiB
C
84 lines
2.4 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 adcc2_parms[] =
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{
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[ADC_BUTTONS] = 0x80 | (5 << 1) | 1, /* ADCIN2 */
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[ADC_REMOTE] = 0x80 | (6 << 1) | 1, /* ADCIN3 */
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[ADC_BATTERY] = 0x80 | (0 << 1) | 1, /* BATVOLT, resistive divider */
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[ADC_REMOTEDETECT] = 0x80 | (2 << 1) | 1, /* ADCIN1, resistive divider */
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};
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unsigned short adc_scan(int channel)
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{
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int level = set_irq_level(HIGHEST_IRQ_LEVEL);
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unsigned char data;
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pcf50606_write(0x2f, adcc2_parms[channel]);
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data = pcf50606_read(0x30);
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adcdata[channel] = data;
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set_irq_level(level);
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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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adc_scan(ADC_REMOTEDETECT); /* Temporary. Remove when the remote
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detection feels stable. */
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}
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}
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void adc_init(void)
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{
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or_l(0x80600080, &GPIO_FUNCTION); /* GPIO7: CS
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GPIO21: Data In (to the ADC)
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GPIO22: CLK
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GPIO31: Data Out (from the ADC) */
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or_l(0x00600080, &GPIO_ENABLE);
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or_l(0x80, &GPIO_OUT); /* CS high */
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and_l(~0x00400000, &GPIO_OUT); /* CLK low */
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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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