65 lines
2.3 KiB
C
65 lines
2.3 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 © 2009 Bertrik Sikken
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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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/* Battery voltage calculation and discharge/charge curves for the HiFiMAN HM-60x.
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Battery voltage is calculated under the assumption that the adc full-scale
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readout represents 3.00V and that the battery ADC channel is fed with
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exactly half of the battery voltage (through a resistive divider).
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Charge curve have not been calibrated yet.
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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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/* TODO: this is just an initial guess */
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3350
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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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/* Calibrated curve */
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{ 3300, 3468, 3521, 3562, 3609, 3644, 3691, 3767, 3837, 3919, 4100 }
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};
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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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/* TODO: simple copy of discharge curve */
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{ 3300, 3468, 3521, 3562, 3609, 3644, 3691, 3767, 3837, 3919, 4100 };
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/* full-scale ADC readout (2^10) in millivolt */
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#define BATTERY_SCALE_FACTOR 6000
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/* Returns battery voltage from ADC [millivolts] */
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int _battery_voltage(void)
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{
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return (adc_read(ADC_BATTERY) * BATTERY_SCALE_FACTOR) >> 10;
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}
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