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// fsm-standby.c: standby mode functions for SpaghettiMonster.
// Copyright (C) 2017-2023 Selene ToyKeeper
// SPDX-License-Identifier: GPL-3.0-or-later
#pragma once
#include <avr/interrupt.h>
#include <avr/sleep.h>
#include "fsm-adc.h"
#include "fsm-wdt.h"
#include "fsm-pcint.h"
// low-power standby mode used while off but power still connected
#define standby_mode sleep_until_eswitch_pressed
void sleep_until_eswitch_pressed()
{
#ifdef TICK_DURING_STANDBY
WDT_slow();
#else
WDT_off();
#endif
ADC_off();
// make sure switch isn't currently pressed
while (button_is_pressed()) {}
empty_event_sequence(); // cancel pending input on suspend
PCINT_on(); // wake on e-switch event
#ifdef TICK_DURING_STANDBY
// detect which type of event caused a wake-up
irq_adc = 0;
irq_wdt = 0;
irq_pcint = 0;
while (go_to_standby) {
#else
go_to_standby = 0;
#endif
// configure sleep mode
#ifdef TICK_DURING_STANDBY
// needs a special sleep mode to get accurate measurements
// quickly ... full power-down ends up using more power
// overall, and causes some weird issues when the MCU
// doesn't stay awake enough cycles to complete a reading
if (adc_active_now)
set_sleep_mode(SLEEP_MODE_ADC);
else
#endif
set_sleep_mode(SLEEP_MODE_PWR_DOWN);
sleep_enable();
#ifdef BODCR // only do this on MCUs which support it
sleep_bod_disable();
#endif
sleep_cpu(); // wait here
// something happened; wake up
sleep_disable();
#ifdef TICK_DURING_STANDBY
// determine what woke us up...
if (irq_pcint) { // button pressed; wake up
go_to_standby = 0;
}
if (irq_adc) { // ADC done measuring
#ifndef USE_LOWPASS_WHILE_ASLEEP
adc_reset = 1; // don't lowpass while asleep
#endif
adc_deferred_enable = 1;
adc_deferred();
//ADC_off(); // takes care of itself
//irq_adc = 0; // takes care of itself
}
if (irq_wdt) { // generate a sleep tick
WDT_inner();
}
}
#endif
// don't lowpass immediately after waking
// also, reset thermal history
adc_reset = 2;
// go back to normal running mode
// PCINT not needed any more, and can cause problems if on
// (occasional reboots on wakeup-by-button-press)
PCINT_off();
// restore normal awake-mode interrupts
ADC_on();
WDT_on();
}
#ifdef USE_IDLE_MODE
void idle_mode()
{
// configure sleep mode
set_sleep_mode(SLEEP_MODE_IDLE);
sleep_enable();
sleep_cpu(); // wait here
// something happened; wake up
sleep_disable();
}
#endif
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