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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 by Linus Nielsen Feltzing
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "cpu.h"
#include "system.h"
#include "kernel.h"
#include "thread.h"
#include "adc.h"
#include "pcf50606.h"
/* get remaining 2 bits and return 10 bit value */
static int get_10bit_voltage(int msbdata)
{
int data = msbdata << 2;
data |= pcf50606_read(0x31) & 0x3;
return data;
}
unsigned short adc_scan(int channel)
{
static const int adcc2_parms[] =
{
[ADC_BUTTONS] = 0x81 | (5 << 1), /* 8b - ADCIN2 */
[ADC_REMOTE] = 0x81 | (6 << 1), /* 8b - ADCIN3 */
[ADC_BATTERY] = 0x01 | (0 << 1), /* 10b - BATVOLT, resistive divider */
};
int level;
int data;
level = disable_irq_save();
pcf50606_write(0x2f, adcc2_parms[channel]);
data = pcf50606_read(0x30);
if (channel == ADC_BATTERY)
data = get_10bit_voltage(data);
restore_irq(level);
return (unsigned short)data;
}
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