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Meizu M3: initial version of battery readout and (uncalibrated) charge/discharge curves

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21812 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Bertrik Sikken 2009-07-12 15:33:58 +00:00
parent 11f9f3cd46
commit 111af64e74
1 changed files with 67 additions and 0 deletions
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firmware/target/arm/s5l8700/meizu-m3/powermgmt-m3.c Normal file
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright © 2009 Bertrik Sikken
*
* 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 "adc.h"
#include "adc-target.h"
#include "powermgmt.h"
/* Battery voltage calculation and discharge/charge curves for the Meizu M3.
Battery voltage is calculated under the assumption that the adc full-scale
readout represents 3.00V and that the battery ADC channel is fed with
exactly half of the battery voltage (through a resistive divider).
Discharge and charge curves have not been calibrated yet.
*/
const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
{
/* TODO: this is just an initial guess */
3400
};
const unsigned short battery_level_shutoff[BATTERY_TYPES_COUNT] =
{
/* TODO: this is just an initial guess */
3300
};
/* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
const unsigned short percent_to_volt_discharge[BATTERY_TYPES_COUNT][11] =
{
/* TODO: simple uncalibrated curve, linear except for first 10% */
{ 3300, 3600, 3665, 3730, 3795, 3860, 3925, 3990, 4055, 4120, 4185 }
};
/* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
const unsigned short percent_to_volt_charge[11] =
/* TODO: simple uncalibrated curve, linear except for first 10% */
{ 3300, 3600, 3665, 3730, 3795, 3860, 3925, 3990, 4055, 4120, 4185 };
/* full-scale ADC readout (2^10) in millivolt */
#define BATTERY_SCALE_FACTOR 6000
/* Returns battery voltage from ADC [millivolts] */
unsigned int battery_adc_voltage(void)
{
return (adc_read(ADC_BATTERY) * BATTERY_SCALE_FACTOR) >> 10;
}