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/*
* Simple PWM controller
* Standby coordination
*
* Copyright (c) 2020 Michael Buesch <m@bues.ch>
*
* 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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "compat.h"
#include "debug.h"
#include "standby.h"
#include "util.h"
#include "watchdog.h"
#include "adc.h"
#include "main.h"
#include "arithmetic.h"
#include "battery.h"
/* Delay before entering deep sleep mode. */
#define DEEP_SLEEP_DELAY_MS 5000u /* milliseconds */
/* Use the deep sleep delay after this many active microseconds. */
#define DEEP_SLEEP_DELAY_AFTER_ACTIVE_MS 300u /* milliseconds */
enum standby_suppress {
STANDBY_SUPPRESS_UNKNOWN,
STANDBY_SUPPRESS_YES,
STANDBY_SUPPRESS_NO,
};
static struct {
uint16_t sys_active_ms;
uint16_t delay_timer_ms;
enum standby_suppress suppress[NR_STANDBY_SRC];
bool was_possible;
} standby;
/* Check if standby is possible according to all sources. */
static bool standby_is_possible(void)
{
uint8_t i;
bool possible;
if (USE_DEEP_SLEEP) {
possible = true;
for (i = 0u; i < NR_STANDBY_SRC; i++)
possible &= standby.suppress[i] == STANDBY_SUPPRESS_NO;
} else
possible = false;
return possible;
}
void set_standby_suppress(enum standby_source source, bool suppress)
{
if (USE_DEEP_SLEEP) {
if (source < NR_STANDBY_SRC) {
if (suppress)
standby.suppress[source] = STANDBY_SUPPRESS_YES;
else
standby.suppress[source] = STANDBY_SUPPRESS_NO;
}
}
}
/* Handle wake up from deep sleep.
* Interrupts shall be disabled before calling this function. */
void standby_handle_deep_sleep_wakeup(void)
{
uint8_t i;
if (USE_DEEP_SLEEP) {
/* We just woke up from standby.
* Reset active time and reset all suppress-flags. */
standby.sys_active_ms = 0u;
for (i = 0u; i < NR_STANDBY_SRC; i++)
standby.suppress[i] = STANDBY_SUPPRESS_UNKNOWN;
}
}
/* Watchdog timer interrupt service routine
* for standby handling.
* Interrupts shall be disabled before calling this function. */
void standby_handle_watchdog_interrupt(bool wakeup_from_standby)
{
uint16_t sys_active_rel_ms;
if (USE_DEEP_SLEEP) {
sys_active_rel_ms = watchdog_interval_ms();
if (!wakeup_from_standby) {
/* The system is active.
* Increment the active time.
* The time is approximate and saturates at 65535 ms. */
standby.sys_active_ms = add_sat_u16(standby.sys_active_ms,
sys_active_rel_ms);
}
if (standby_is_possible()) {
/* A deep sleep is pending.
* Decrement the delay timer. */
standby.delay_timer_ms = sub_sat_u16(
standby.delay_timer_ms, sys_active_rel_ms);
}
}
}
/* Update the watchdog standby state, if required.
* Interrupts shall be disabled before calling this function. */
static void update_watchdog_standby(void)
{
uint8_t i;
bool set_wd_standby;
bool wd_standby;
if (USE_DEEP_SLEEP) {
set_wd_standby = true;
wd_standby = true;
for (i = 0u; i < NR_STANDBY_SRC; i++) {
/* If any source state is still unknown, do not update WD state. */
set_wd_standby &= standby.suppress[i] != STANDBY_SUPPRESS_UNKNOWN;
/* WD standby, if all sources are Ok for standby. */
wd_standby &= standby.suppress[i] == STANDBY_SUPPRESS_NO;
}
if (set_wd_standby)
watchdog_set_standby(wd_standby);
}
}
/* Main loop check: Enter deep sleep now?
* Interrupts shall be disabled before calling this function. */
bool standby_is_desired_now(void)
{
bool is_possible;
bool standby_request_normal;
bool standby_request_battery;
bool go_standby = false;
if (USE_DEEP_SLEEP) {
is_possible = standby_is_possible();
/* If we just got ready to enter standby
* and the system has been running for some time
* then delay the standby for a bit. */
if (is_possible && !standby.was_possible) {
if (standby.sys_active_ms >= DEEP_SLEEP_DELAY_AFTER_ACTIVE_MS)
standby.delay_timer_ms = DEEP_SLEEP_DELAY_MS;
}
standby.was_possible = is_possible;
/* Check if normal standby is requested. */
standby_request_normal = (is_possible &&
standby.delay_timer_ms == 0u);
/* Check if standby due to critical battery voltage is requested. */
standby_request_battery = (battery_voltage_is_critical() &&
!adc_battery_measurement_active());
if (standby_request_normal || standby_request_battery)
go_standby = true;
update_watchdog_standby();
}
return go_standby;
}
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