65 lines
2.1 KiB
C
65 lines
2.1 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 © 2008 Rafaël Carré
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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 "adc-target.h"
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#include "powermgmt.h"
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/* The battery manufacturer's website shows discharge curves down to 3.0V,
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so 'dangerous' and 'shutoff' levels of 3.4V and 3.3V should be safe.
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*/
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const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
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{
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3400
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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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{ 3300, 3653, 3701, 3735, 3768, 3790, 3833, 3900, 3966, 4056, 4140 }
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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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/* TODO: simple linear uncalibrated curve */
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3300, 3390, 3480, 3570, 3660, 3750, 3840, 3930, 4020, 4110, 4200
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};
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#endif /* CONFIG_CHARGING */
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/* ADC should read 0x3ff=5.12V */
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#define BATTERY_SCALE_FACTOR 5125
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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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return (adc_read(ADC_RTCSUP) * BATTERY_SCALE_FACTOR) >> 10;
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}
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