d633a9fbee
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21754 a1c6a512-1295-4272-9138-f99709370657
84 lines
2.6 KiB
C
84 lines
2.6 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) 2007 by Karl Kurbjun
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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 "adc.h"
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#include "powermgmt.h"
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#include "kernel.h"
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#include "pcf50606.h"
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unsigned short current_voltage = 3910;
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const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
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{
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3380
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};
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const unsigned short battery_level_shutoff[BATTERY_TYPES_COUNT] =
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{
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3300
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};
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/* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
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const unsigned short percent_to_volt_discharge[BATTERY_TYPES_COUNT][11] =
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{
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/* Standard D2 internal battery */
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{ 3370, 3690, 3750, 3775, 3790, 3820, 3880, 3940, 3980, 4090, 4170 }
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/* TODO: DIY replacements eg. Nokia BP-4L ? */
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};
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#if CONFIG_CHARGING
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/* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
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const unsigned short percent_to_volt_charge[11] =
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{
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/* FIXME: voltages seem to be offset during charging (eg. 4500+) */
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3370, 3690, 3750, 3775, 3790, 3820, 3880, 3940, 3980, 4090, 4170
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};
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#endif /* CONFIG_CHARGING */
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#define BATTERY_SCALE_FACTOR 6000
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/* full-scale ADC readout (2^10) in millivolt */
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/* Returns battery voltage from ADC [millivolts] */
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unsigned int battery_adc_voltage(void)
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{
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static unsigned last_tick = 0;
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if (TIME_BEFORE(last_tick+HZ, current_tick))
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{
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int adc_val, irq_status;
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unsigned char buf[2];
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irq_status = disable_irq_save();
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pcf50606_write(PCF5060X_ADCC2, 0x1);
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pcf50606_read_multiple(PCF5060X_ADCS1, buf, 2);
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restore_interrupt(irq_status);
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adc_val = (buf[0]<<2) | (buf[1] & 3); //ADCDAT1H+ADCDAT1L
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current_voltage = (adc_val * BATTERY_SCALE_FACTOR) >> 10;
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last_tick = current_tick;
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}
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return current_voltage;
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}
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