07bfba21ae
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17648 a1c6a512-1295-4272-9138-f99709370657
89 lines
2.5 KiB
C
89 lines
2.5 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 "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 "string.h"
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#include "adc.h"
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#include "pcf50605.h"
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#include "i2c-pp.h"
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struct adc_struct {
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long timeout;
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void (*conversion)(unsigned short *data);
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short channelnum;
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unsigned short data;
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};
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static struct adc_struct adcdata[NUM_ADC_CHANNELS] IDATA_ATTR;
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static unsigned short _adc_read(struct adc_struct *adc)
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{
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if (adc->timeout < current_tick) {
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unsigned char data[2];
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unsigned short value;
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i2c_lock();
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/* 5x per 2 seconds */
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adc->timeout = current_tick + (HZ * 2 / 5);
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/* ADCC1, 10 bit, start */
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pcf50605_write(0x2f, (adc->channelnum << 1) | 0x1);
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pcf50605_read_multiple(0x30, data, 2); /* ADCS1, ADCS2 */
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value = data[0];
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value <<= 2;
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value |= data[1] & 0x3;
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if (adc->conversion) {
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adc->conversion(&value);
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}
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adc->data = value;
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i2c_unlock();
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return value;
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} else
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{
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return adc->data;
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}
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}
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/* Force an ADC scan _now_ */
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unsigned short adc_scan(int channel) {
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struct adc_struct *adc = &adcdata[channel];
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adc->timeout = 0;
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return _adc_read(adc);
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}
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/* Retrieve the ADC value, only does a scan periodically */
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unsigned short adc_read(int channel) {
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return _adc_read(&adcdata[channel]);
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}
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void adc_init(void)
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{
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struct adc_struct *adc_battery = &adcdata[ADC_BATTERY];
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adc_battery->channelnum = 0x2; /* ADCVIN1, resistive divider */
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adc_battery->timeout = 0;
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adcdata[ADC_ACCESSORY].channelnum = 4;
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adcdata[ADC_ACCESSORY].timeout = 0;
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_adc_read(adc_battery);
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}
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