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rockbox/firmware/powermgmt.c
Jörg Hohensohn af2d88081a battery levels adjusted for Ondio 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5230 a1c6a512-1295-4272-9138-f99709370657
2004-10-08 21:44:24 +00:00

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Heikki Hannikainen, Uwe Freese
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "sh7034.h"
#include "kernel.h"
#include "thread.h"
#include "system.h"
#include "debug.h"
#include "panic.h"
#include "adc.h"
#include "string.h"
#include "sprintf.h"
#include "ata.h"
#include "power.h"
#include "button.h"
#include "ata.h"
#include "mpeg.h"
#include "usb.h"
#include "powermgmt.h"
#include "backlight.h"
#ifdef CONFIG_TUNER
#include "fmradio.h"
#endif
long last_event_tick;
void reset_poweroff_timer(void)
{
last_event_tick = current_tick;
}
#ifdef SIMULATOR
int battery_level(void)
{
return 75;
}
int battery_time(void)
{
return 500;
}
bool battery_level_safe(void)
{
return battery_level() >= 10;
}
void set_poweroff_timeout(int timeout)
{
(void)timeout;
}
void set_battery_capacity(int capacity)
{
(void)capacity;
}
void set_car_adapter_mode(bool setting)
{
(void)setting;
}
#else /* not SIMULATOR */
int battery_capacity = 1500; /* only a default value */
int battery_level_cached = -1; /* battery level of this minute, updated once
per minute */
static bool car_adapter_mode_enabled = false;
static const int poweroff_idle_timeout_value[15] =
{
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 30, 45, 60
};
static const int percent_to_volt_decharge[11] =
/* voltages (centivolt) of 0%, 10%, ... 100% when charging disabled */
{
#if CONFIG_BATTERY == BATT_LIION2200
/* measured values */
260, 285, 295, 303, 311, 320, 330, 345, 360, 380, 400
#elif CONFIG_BATTERY == BATT_3AAA_ALKALINE
/* taken from a textbook alkaline discharge graph, not measured */
270, 303, 324, 336, 348, 357, 366, 378, 390, 408, 450
#else /* NiMH */
/* original values were taken directly after charging, but it should show
100% after turning off the device for some hours, too */
450, 481, 491, 497, 503, 507, 512, 514, 517, 525, 540 /* orig. values:
...,528,560 */
#endif
};
void set_battery_capacity(int capacity)
{
battery_capacity = capacity;
if (battery_capacity > BATTERY_CAPACITY_MAX)
battery_capacity = BATTERY_CAPACITY_MAX;
if (battery_capacity < 1500)
battery_capacity = 1500;
}
#if defined(HAVE_CHARGE_CTRL) || CONFIG_BATTERY == BATT_LIION2200
int charge_state = 0; /* at the beginning, the
charger does nothing */
#endif
#ifdef HAVE_CHARGE_CTRL
char power_message[POWER_MESSAGE_LEN] = ""; /* message that's shown in
debug menu */
char charge_restart_level = CHARGE_RESTART_HI; /* level at which charging
starts */
int powermgmt_last_cycle_startstop_min = 25; /* how many minutes ago was the
charging started or
stopped? */
int powermgmt_last_cycle_level = 0; /* which level had the
batteries at this time? */
bool trickle_charge_enabled = true;
int trickle_sec = 0; /* how many seconds should the
charger be enabled per
minute for trickle
charging? */
static const int percent_to_volt_charge[11] =
/* voltages (centivolt) of 0%, 10%, ... 100% when charging enabled */
{
/* values guessed, see
http://www.seattlerobotics.org/encoder/200210/LiIon2.pdf until someone
measures voltages over a charging cycle */
476, 544, 551, 556, 561, 564, 566, 576, 582, 584, 585 /* NiMH */
};
void enable_trickle_charge(bool on)
{
trickle_charge_enabled = on;
}
#endif /* HAVE_CHARGE_CTRL */
static char power_stack[DEFAULT_STACK_SIZE];
static const char power_thread_name[] = "power";
static int poweroff_timeout = 0;
static long last_charge_time = 0;
int powermgmt_est_runningtime_min = -1;
static bool sleeptimer_active = false;
static unsigned long sleeptimer_endtick;
unsigned short power_history[POWER_HISTORY_LEN];
int battery_time(void)
{
return powermgmt_est_runningtime_min;
}
/* look into the percent_to_volt_* table and get a realistic battery level
percentage */
int voltage_to_percent(int voltage, const int* table)
{
if (voltage <= table[0])
return 0;
else
if (voltage >= table[10])
return 100;
else {
/* search nearest value */
int i = 0;
while ((i < 10) && (table[i+1] < voltage))
i++;
/* interpolate linear between the smaller and greater value */
return i * 10 /* 10th */
+ (voltage - table[i]) *
10 / (table[i+1] - table[i]); /* 1th */
}
}
/* update battery level, called only once per minute */
void battery_level_update(void)
{
int level = 0;
int c = 0;
int i;
/* calculate maximum over last 3 minutes (skip empty samples) */
for (i = 0; i < 3; i++)
if (power_history[POWER_HISTORY_LEN-1-i] > c)
c = power_history[POWER_HISTORY_LEN-1-i];
if (c)
level = c;
else /* history was empty, get a fresh sample */
level = (adc_read(ADC_UNREG_POWER) * BATTERY_SCALE_FACTOR) / 10000;
if(level > BATTERY_LEVEL_FULL)
level = BATTERY_LEVEL_FULL;
if(level < BATTERY_LEVEL_EMPTY)
level = BATTERY_LEVEL_EMPTY;
#ifdef HAVE_CHARGE_CTRL
if (charge_state == 0) { /* decharge */
level = voltage_to_percent(level, percent_to_volt_decharge);
}
else if (charge_state == 1) { /* charge */
level = voltage_to_percent(level, percent_to_volt_charge);
}
else {/* in trickle charge, the battery is per definition 100% full */
battery_level_cached = level = 100;
}
#else
level = voltage_to_percent(level, percent_to_volt_decharge);
/* always use the decharge table */
#endif
if (battery_level_cached == -1) { /* first run of this procedure */
/* the battery voltage is usually a little lower directly after
turning on, because the disk was used heavily raise it by 5 % */
battery_level_cached = (level > 95) ? 100 : level + 5;
}
else {
/* the level is allowed to be -1 of the last value when usb not
connected and to be -3 of the last value when usb is connected */
if (usb_inserted()) {
if (level < battery_level_cached - 3)
level = battery_level_cached - 3;
}
else {
if (level < battery_level_cached - 1)
level = battery_level_cached - 1;
}
battery_level_cached = level;
}
}
/* Returns battery level in percent */
int battery_level(void)
{
#ifdef HAVE_CHARGE_CTRL
if ((charge_state==1) && (battery_level_cached==100))
return 99;
#endif
return battery_level_cached;
}
/* Tells if the battery level is safe for disk writes */
bool battery_level_safe(void)
{
/* I'm pretty sure we don't want an average over a long time here */
if (power_history[POWER_HISTORY_LEN-1])
return power_history[POWER_HISTORY_LEN-1] > BATTERY_LEVEL_DANGEROUS;
else
return adc_read(ADC_UNREG_POWER) > (BATTERY_LEVEL_DANGEROUS * 10000) /
BATTERY_SCALE_FACTOR;
}
void set_poweroff_timeout(int timeout)
{
poweroff_timeout = timeout;
}
void set_sleep_timer(int seconds)
{
if(seconds) {
sleeptimer_active = true;
sleeptimer_endtick = current_tick + seconds * HZ;
}
else {
sleeptimer_active = false;
sleeptimer_endtick = 0;
}
}
int get_sleep_timer(void)
{
if(sleeptimer_active)
return (sleeptimer_endtick - current_tick) / HZ;
else
return 0;
}
/* We shut off in the following cases:
1) The unit is idle, not playing music
2) The unit is playing music, but is paused
We do not shut off in the following cases:
1) The USB is connected
2) The charger is connected
3) We are recording, or recording with pause
*/
static void handle_auto_poweroff(void)
{
long timeout = poweroff_idle_timeout_value[poweroff_timeout]*60*HZ;
int mpeg_stat = mpeg_status();
bool charger_is_inserted = charger_inserted();
static bool charger_was_inserted = false;
/* The was_inserted thing prevents the unit to shut down immediately
when the charger is extracted */
if(charger_is_inserted || charger_was_inserted)
{
last_charge_time = current_tick;
}
charger_was_inserted = charger_is_inserted;
if(timeout &&
#ifdef CONFIG_TUNER
!fmradio_get_status() &&
#endif
!usb_inserted() &&
(mpeg_stat == 0 ||
((mpeg_stat == (MPEG_STATUS_PLAY | MPEG_STATUS_PAUSE)) &&
!sleeptimer_active)))
{
if(TIME_AFTER(current_tick, last_event_tick + timeout) &&
TIME_AFTER(current_tick, last_disk_activity + timeout) &&
TIME_AFTER(current_tick, last_charge_time + timeout))
{
power_off();
}
}
else
{
/* Handle sleeptimer */
if(sleeptimer_active && !usb_inserted())
{
if(TIME_AFTER(current_tick, sleeptimer_endtick))
{
mpeg_stop();
if(charger_is_inserted)
{
DEBUGF("Sleep timer timeout. Stopping...\n");
set_sleep_timer(0);
backlight_off(); /* Nighty, nighty... */
}
else
{
DEBUGF("Sleep timer timeout. Shutting off...\n");
/* Make sure that the disk isn't spinning when
we cut the power */
while(ata_disk_is_active())
sleep(HZ);
power_off();
}
}
}
}
}
void set_car_adapter_mode(bool setting)
{
car_adapter_mode_enabled = setting;
}
static bool charger_power_is_on;
static void car_adapter_mode_processing(void)
{
static bool waiting_to_resume_play = false;
static long play_resume_time;
if (car_adapter_mode_enabled) {
if (waiting_to_resume_play) {
if (TIME_AFTER(current_tick, play_resume_time)) {
if (mpeg_status() & MPEG_STATUS_PAUSE) {
mpeg_resume();
}
waiting_to_resume_play = false;
}
}
else {
if (charger_power_is_on) {
/* if external power was turned off */
if (!charger_inserted()) {
charger_power_is_on = false;
/* if playing */
if ((mpeg_status() & MPEG_STATUS_PLAY) &&
!(mpeg_status() & MPEG_STATUS_PAUSE)) {
mpeg_pause();
}
}
}
else {
/* if external power was turned on */
if (charger_inserted()) {
charger_power_is_on = true;
/* if paused */
if (mpeg_status() & MPEG_STATUS_PAUSE) {
/* delay resume a bit while the engine is cranking */
play_resume_time = current_tick + HZ*5;
waiting_to_resume_play = true;
}
}
}
}
}
}
/*
* This function is called to do the relativly long sleep waits from within the
* main power_thread loop while at the same time servicing any other periodic
* functions in the power thread which need to be called at a faster periodic
* rate than the slow periodic rate of the main power_thread loop
*/
static void power_thread_sleep(int ticks)
{
while (ticks > 0) {
int small_ticks = MIN(HZ/2, ticks);
sleep(small_ticks);
ticks -= small_ticks;
car_adapter_mode_processing();
}
}
/*
* This power thread maintains a history of battery voltage
* and implements a charging algorithm.
* For a complete description of the charging algorithm read
* docs/CHARGING_ALGORITHM.
*/
static void power_thread(void)
{
int i;
int avg, ok_samples, spin_samples;
int current = 0;
#if CONFIG_BATTERY == BATT_LIION2200
int charging_current;
#endif
#ifdef HAVE_CHARGE_CTRL
int delta;
int charged_time = 0;
int charge_max_time_now = 0; /* max. charging duration, calculated at
beginning of charging */
int charge_pause = 0; /* no charging pause at the beginning */
int trickle_time = 0; /* how many minutes trickle charging already? */
#endif
while (1)
{
/* never read power while disk is spinning, unless in USB mode */
if (ata_disk_is_active() && !usb_inserted()) {
sleep(HZ * 2);
continue;
}
/* Make POWER_AVG measurements and calculate an average of that to
* reduce the effect of backlights/disk spinning/other variation.
*/
ok_samples = spin_samples = avg = 0;
for (i = 0; i < POWER_AVG_N; i++) {
if (ata_disk_is_active()) {
if (!ok_samples) {
/* if we don't have any good non-disk-spinning samples,
* we take a sample anyway in case the disk is going
* to spin all the time.
*/
avg += adc_read(ADC_UNREG_POWER);
spin_samples++;
}
} else {
if (spin_samples) /* throw away disk-spinning samples */
spin_samples = avg = 0;
avg += adc_read(ADC_UNREG_POWER);
ok_samples++;
}
power_thread_sleep(HZ*POWER_AVG_SLEEP);
}
avg = avg / ((ok_samples) ? ok_samples : spin_samples);
/* rotate the power history */
for (i = 0; i < POWER_HISTORY_LEN-1; i++)
power_history[i] = power_history[i+1];
/* insert new value in the end, in centivolts 8-) */
power_history[POWER_HISTORY_LEN-1] =
(avg * BATTERY_SCALE_FACTOR) / 10000;
/* update battery level every minute, ignoring first 15 minutes after
start charge/decharge */
#ifdef HAVE_CHARGE_CTRL
if ((powermgmt_last_cycle_startstop_min > 25) || (charge_state > 1))
#endif
battery_level_update();
/* calculate estimated remaining running time */
/* decharging: remaining running time */
/* charging: remaining charging time */
#ifdef HAVE_CHARGE_CTRL
if (charge_state == 1)
powermgmt_est_runningtime_min = (100 - battery_level()) *
battery_capacity / 100 * 60 / CURRENT_CHARGING;
else {
current = usb_inserted() ? CURRENT_USB : CURRENT_NORMAL;
if ((backlight_get_timeout() == 1) ||
(charger_inserted() && backlight_get_on_when_charging()))
/* LED always on or LED on when charger connected */
current += CURRENT_BACKLIGHT;
powermgmt_est_runningtime_min = battery_level() *
battery_capacity / 100 * 60 / current;
#if MEM == 8 /* assuming 192 kbps, the running time is 22% longer with 8MB */
powermgmt_est_runningtime_min =
powermgmt_est_runningtime_min * 122 / 100;
#endif /* MEM == 8 */
}
#else
current = usb_inserted() ? CURRENT_USB : CURRENT_NORMAL;
if (backlight_get_timeout() == 1) /* LED always on */
current += CURRENT_BACKLIGHT;
powermgmt_est_runningtime_min = battery_level() *
battery_capacity / 100 * 60 / current;
#if MEM == 8 /* assuming 192 kbps, the running time is 22% longer with 8MB */
powermgmt_est_runningtime_min =
powermgmt_est_runningtime_min * 122 / 100;
#endif /* MEM == 8 */
#endif /* HAVE_CHARGE_CONTROL */
#if CONFIG_BATTERY == BATT_LIION2200
/* We use the information from the ADC_EXT_POWER ADC channel, which
tells us the charging current from the LTC1734. When DC is
connected (either via the external adapter, or via USB), we try
to determine if it is actively charging or only maintaining the
charge. My tests show that ADC readings is below about 0x80 means
that the LTC1734 is only maintaining the charge. */
if(charger_inserted()) {
charging_current = adc_read(ADC_EXT_POWER);
if(charging_current < 0x80) {
charge_state = 2; /* Trickle */
} else {
charge_state = 1; /* Charging */
}
} else {
charge_state = 0; /* Not charging */
}
#else
#ifdef HAVE_CHARGE_CTRL
if (charge_pause > 0)
charge_pause--;
if (charger_inserted()) {
if (charge_state == 1) {
/* charger inserted and enabled */
charged_time++;
snprintf(power_message, POWER_MESSAGE_LEN,
"Chg %dm max %dm", charged_time, charge_max_time_now);
if (charged_time > charge_max_time_now) {
DEBUGF("power: charged_time > charge_max_time_now, "
"enough!\n");
/* have charged too long and deltaV detection did not
work! */
powermgmt_last_cycle_level = battery_level();
powermgmt_last_cycle_startstop_min = 0;
charger_enable(false);
snprintf(power_message, POWER_MESSAGE_LEN,
"Chg tmout %d min", charge_max_time_now);
/* disable charging for several hours from this point,
just to be sure */
charge_pause = CHARGE_PAUSE_LEN;
/* no trickle charge here, because the charging cycle
didn't end the right way */
charge_state = 0; /* 0: decharging/charger off, 1: charge,
2: top-off, 3: trickle */
} else {
if (charged_time > CHARGE_MIN_TIME) {
/* have charged continuously over the minimum charging
time, so we monitor for deltaV going
negative. Multiply thingsby 100 to get more
accuracy without floating point arithmetic.
power_history[] contains centivolts so after
multiplying by 100 the deltas are in tenths of
millivolts (delta of 5 is 0.0005 V).
*/
delta =
( power_history[POWER_HISTORY_LEN-1] * 100
+ power_history[POWER_HISTORY_LEN-2] * 100
- power_history[POWER_HISTORY_LEN-1-
CHARGE_END_NEGD+1] * 100
- power_history[POWER_HISTORY_LEN-1-
CHARGE_END_NEGD] * 100 )
/ CHARGE_END_NEGD / 2;
if (delta < -100) { /* delta < -10 mV */
DEBUGF("power: short-term negative"
" delta, enough!\n");
powermgmt_last_cycle_level = battery_level();
powermgmt_last_cycle_startstop_min = 0;
charger_enable(false);
snprintf(power_message, POWER_MESSAGE_LEN,
"end negd %d %dmin", delta, charged_time);
/* disable charging for several hours from this
point, just to be sure */
charge_pause = CHARGE_PAUSE_LEN;
/* enable trickle charging */
if (trickle_charge_enabled) {
trickle_sec = CURRENT_NORMAL * 60 /
CURRENT_CHARGING;
/* first guess, maybe consider if LED
backlight is on, disk is active,... */
trickle_time = 0;
charge_state = 2; /* 0: decharging/charger
off, 1: charge,
2: top-off, 3: trickle */
} else {
charge_state = 0; /* 0: decharging/charger
off, 1: charge,
2: top-off, 3: trickle */
}
} else {
/* if we didn't disable the charger in the
previous test, check for low positive delta */
delta =
( power_history[POWER_HISTORY_LEN-1] * 100
+ power_history[POWER_HISTORY_LEN-2] * 100
- power_history[POWER_HISTORY_LEN-1-
CHARGE_END_ZEROD+1] * 100
- power_history[POWER_HISTORY_LEN-1-
CHARGE_END_ZEROD] * 100 )
/ CHARGE_END_ZEROD / 2;
if (delta < 1) { /* delta < 0.1 mV */
DEBUGF("power: long-term small "
"positive delta, enough!\n");
powermgmt_last_cycle_level = battery_level();
powermgmt_last_cycle_startstop_min = 0;
charger_enable(false);
snprintf(power_message, POWER_MESSAGE_LEN,
"end lowd %d %dmin",
delta, charged_time);
/* disable charging for several hours from
this point, just to be sure */
charge_pause = CHARGE_PAUSE_LEN;
/* enable trickle charging */
if (trickle_charge_enabled) {
trickle_sec =
CURRENT_NORMAL * 60 / CURRENT_CHARGING;
/* first guess, maybe consider if LED
backlight is on, disk is active,... */
trickle_time = 0;
charge_state = 2;
/* 0: decharging/charger off, 1: charge,
2: top-off, 3: trickle */
} else {
charge_state = 0;
/* 0: decharging/charger off, 1: charge,
2: top-off, 3: trickle */
}
}
}
}
}
}
else if (charge_state > 1) { /* top off or trickle? */
/* adjust trickle charge time */
if ( ((charge_state == 2) &&
(power_history[POWER_HISTORY_LEN-1] > TOPOFF_VOLTAGE))
|| ((charge_state == 3) &&
(power_history[POWER_HISTORY_LEN-1] >
TRICKLE_VOLTAGE)) ) { /* charging too much */
trickle_sec--;
}
else { /* charging too less */
trickle_sec++;
}
if (trickle_sec > 24)
trickle_sec = 24;
if (trickle_sec < 1)
trickle_sec = 1;
/* charge the calculated amount of seconds */
charger_enable(true);
power_thread_sleep(HZ * trickle_sec);
charger_enable(false);
/* trickle charging long enough? */
if (trickle_time++ > TRICKLE_MAX_TIME + TOPOFF_MAX_TIME) {
trickle_sec = 0; /* show in debug menu that trickle is
off */
charge_state = 0; /* 0: decharging/charger off, 1: charge,
2: top-off, 3: trickle */
powermgmt_last_cycle_startstop_min = 0;
}
if ((charge_state == 2) &&
(trickle_time > TOPOFF_MAX_TIME)) /* change state? */
charge_state = 3; /* 0: decharging/charger off, 1: charge,
2: top-off, 3: trickle */
} else { /* charge_state == 0 */
/* the charger is enabled here only in one case: if it was
turned on at boot time (power_init) */
/* turn it off now */
if (charger_enabled)
charger_enable(false);
}
/* Start new charge cycle? This must be possible also in
trickle/top-off, because when usb connected, */
/* the trickle charge amount may not be enough */
if ((charge_state == 0) || (charge_state > 1))
/* if battery is not full, enable charging */
/* make sure charging starts if 1%-lazyness in
battery_level_update() is too slow */
if ( (battery_level() < charge_restart_level)
|| (power_history[POWER_HISTORY_LEN-1] <
BATTERY_LEVEL_DANGEROUS)) {
if (charge_pause) {
DEBUGF("power: batt level < restart level,"
" but charge pause, not enabling\n");
snprintf(power_message, POWER_MESSAGE_LEN,
"chg pause %d min", charge_pause);
} else {
/* calculate max charge time depending on current
battery level */
/* take 35% more because some more energy is used for
heating up the battery */
i = CHARGE_MAX_TIME_1500 * battery_capacity / 1500;
charge_max_time_now =
i * (100 + 35 - battery_level()) / 100;
if (charge_max_time_now > i) {
charge_max_time_now = i;
}
snprintf(power_message, POWER_MESSAGE_LEN,
"ChgAt %d%% max %dm", battery_level(),
charge_max_time_now);
/* enable the charger after the max time calc is done,
because battery_level depends on if the charger is
on */
DEBUGF("power: charger inserted and battery"
" not full, enabling\n");
powermgmt_last_cycle_level = battery_level();
powermgmt_last_cycle_startstop_min = 0;
charged_time = 0;
charger_enable(true);
charge_state = 1; /* 0: decharging/charger off, 1:
charge, 2: top-off, 3: trickle */
/* clear the power history so that we don't use values
before discharge for the long-term delta
*/
for (i = 0; i < POWER_HISTORY_LEN-1; i++)
power_history[i] =
power_history[POWER_HISTORY_LEN-1];
}
}
} else {
/* charger not inserted */
if (charge_state > 0) {
/* charger not inserted but was enabled */
DEBUGF("power: charger disconnected, disabling\n");
powermgmt_last_cycle_level = battery_level();
powermgmt_last_cycle_startstop_min = 0;
/* show in debug menu that trickle is off */
trickle_sec = 0;
charger_enable(false);
charge_state = 0; /* 0: decharging/charger off, 1: charge, 2:
top-off, 3: trickle */
snprintf(power_message, POWER_MESSAGE_LEN, "Charger disc");
}
/* charger not inserted and disabled, so we're discharging */
}
powermgmt_last_cycle_startstop_min++;
#endif /* HAVE_CHARGE_CTRL*/
#endif /* # if CONFIG_BATTERY == BATT_LIION2200 */
/* sleep for roughly a minute */
#ifdef HAVE_CHARGE_CTRL
i = 60 - trickle_sec - POWER_AVG_N * POWER_AVG_SLEEP;
#else
i = 60 - POWER_AVG_N * POWER_AVG_SLEEP;
#endif
if (i > 0)
power_thread_sleep(HZ*(i));
handle_auto_poweroff();
}
}
void powermgmt_init(void)
{
power_init();
/* init history to 0 */
memset(power_history, 0x00, sizeof(power_history));
#if 0
/* initialize the history with a single sample to prevent level
flickering during the first minute of execution */
power_history[POWER_HISTORY_LEN-1] =
(adc_read(ADC_UNREG_POWER) * BATTERY_SCALE_FACTOR) / 10000;
/* calculate the first battery level */
battery_level_update();
/* calculate the remaining time to that the info screen displays something
useful */
powermgmt_est_runningtime_min =
battery_level() * battery_capacity / 100 * 60 / CURRENT_NORMAL;
#if MEM == 8 /* assuming 192 kbps, the running time is 22% longer with 8MB */
powermgmt_est_runningtime_min = powermgmt_est_runningtime_min * 122 / 100;
#endif
#ifdef HAVE_CHARGE_CTRL
snprintf(power_message, POWER_MESSAGE_LEN, "Powermgmt started");
/* if the battery is nearly empty, start charging immediately */
if (power_history[POWER_HISTORY_LEN-1] < BATTERY_LEVEL_DANGEROUS)
charger_enable(true);
#endif
#endif
charger_power_is_on = charger_inserted();
create_thread(power_thread, power_stack, sizeof(power_stack),
power_thread_name);
}
#endif /* SIMULATOR */
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